This type of bearing and non- separable non-ionic type two

Angular contact ball bearings Jixiang heart Thrust Ball Bearings , as can be loaded more of the ball, the radial load carrying capacity greater than the ordinary ball bearings , can withstand large axial load or bear the pure axial load, which allows work speed and bearing deep groove ball bearing similarities more rigid , but requires precise installation for misalignment error is very sensitive, it is generally not used alone to bear radial load , radial load while at the same time will bring additional axes to the load . This variant bearing many varieties of applications is very broad, often made with 15 °, 25 ° and 40 ° contact angle of three kinds of series, the greater the contact angle , the higher the axial load capacity , but should be used at high speed small contact angle is appropriate.
Most of these bearings in pairs for a small span rigid double precision spindle bearing axis or , when used to carefully adjust the clearance, change the bearing inner and outer axial distance , you can adjust the bearing internal clearance , while the several sets of bearings installed in parallel and give some preloaded amount , can improve the rigidity of the bearing system .
This type of single bearings can roller bearing manufacturer withstand axial load in one direction , while others need to be configured in order to offset the additional axial bearing force when it is made on the installation of additional axial force which cancel each other out , and can withstand up two forces axial load , and has two strong axial direction limit ability to be installed in pairs generally use two sets of bearing outer race wide face with its relative ( back to back ) or a relatively narrow end ( face to face ) two installation forms , where rigid bearing thin section ball bearings system mounted back to back best . For ease of installation in pairs or groups , some bearing factory supply in pairs, a group of three and four sets of a group such as bearings, bearing the same batch so that the supply of processing consistency, use bear the load more evenly , additional axial forces cancel each other more thoroughly .
This type of bearing and non- separable non-ionic type two, the separation of bearings for restricted installation conditions , requirements from the entire outer or inner ring bearings were installed in order to remove the case , since the separation of angular contact ball bearings are widely used in magnetic motor , it is also known as magneto bearings. This type of bearing on the inner ring in the locking variety, can be adapted to higher speeds .

is a newly developed product is currently being pilot production phase

Tonghua Iron and Steel Group has successfully developed high-speed wire production HRB400ENovember 21 , Tonghua Iron and Steel Group, Shougang Tonghua Steel new line of high-speed wire rod plant produced a total HRB400E8 mm rebar 42 99.7 tons , HRB400E8 mm rebar development and production won success.
It is understood , HRB400E test seismic reinforcement steel is rolling temperature requirements are very strict , is a newly developed product is currently being pilot production phase. The production is the fourth year the plant rolling, rolling is the ball bearing manufacturer largest number of the best one , spinning temperature for the first time dropped to 900 ℃, changing the spinning temperature is not lower than the previous record of 1000 ℃ .
In the production process of organizing , the plant production department and rolling rolling workshop related personnel to develop a reasonable program , repeatedly revised operating points , follow the guidance and technical personnel on-site , requiring workers special bearings reasonably controlled roller speed, to ensure open rolling temperature , temperature and spinning into the finishing temperature , to strengthen the mill grooves , guide and guard the entrance examination , timely adjustment of the finished wire size , seismic steel products to ensure customers' dimensional accuracy requirements to ensure the quality of pruning to ensure end to end water cooling and defective parts are not all clean and trim so storage product quality to meet market and customer needs.
It is reported that the feedback from the technical center sampling data, the indicators uniformity , yield strength and tensile strength to meet quality requirements.

radial bearing a larger size, poor damping capacity

Ball bearings, roller bearings and needle roller bearings. High speed, load is small, requiring high precision rotation should use ball bearings; load is large roller bearings should be selected; loading large radial dimensions should be selected when they restricted needle bearing. Radial bearing rings of the inner and outer ring, inner ring and the shaft sleeve and often with the shaft rotates, the outer ring mounted in the bearing bore. Rolling rolling along the raceway rings, separated by the cage, to avoid friction between. Thrust bearings are divided into a tight circle and live ring in two parts. Tight circle and sleeve tight, live ring bearing in the bearing housing. Rings and rolling body with high strength, good wear resistance bearing steel, surface hardness after quenching should reach HRC60 ~ 65. Cage mostly made of mild steel stamping, and some copper alloy, bakelite cloth or plastic. Basic types listed in the table produced in China basic types of rolling bearings. Various types of rolling bearings is divided into B, C, D, E, G5 a precision. B is the highest accuracy level. G is the general accuracy level, the most common. High speed, there are strict requirements for precision rotation of the spindle, high precision bearings Special bearings should be used, such as precision lathes, milling machines, boring, grinding grinding, aircraft engine, turbocharger, precision instruments selected C, D grade; coordinate boring machine, High-speed grinding elect B, C grade. Rolling easy maintenance, reliable, good starting performance at moderate speeds higher carrying capacity. Compared with the sliding bearing, radial bearing a larger size, poor damping capacity, high speed, low life sound bigger. Rolling in the radial bearings (mainly radial force) usually consists of inner and outer rings, rolling and rolling element cage roller bearing  four parts. Inner sleeve in the journal together with the shaft rotates, the outer ring mounted in the bearing bore. In the inner and the outer periphery of the inner periphery of the outer ring are formed with raceway. When the relative rotation of the inner and outer rings, the inner and outer rings of the rolling element raceway, are separated by the cage, to avoid friction. Thrust bearings are divided into a tight circle and live ring in two parts. Tight circle and sleeve tight, live ring bearing in the bearing housing. Rings and rolling elements commonly used high strength, wear resistance, good bearing steel, surface hardness after quenching should reach HRC60 ~ 65. Cage mostly made of mild steel stamping, copper alloys can also be used bakelite cloth or plastic manufacturing

published a point of view.

SKF executives of leading thin bearings of Chinese fansRecently, in 2010, during the International Wind Energy Conference, SKF global renewable energy sector, Mr. Stefan Karlsson responsible person to accept an interview with reporters and fans on Chinese enterprises into the development status, and published a point of view.
Here is SKF's exclusive distributor in China reported, according to officials Stefan Karlsson SKF introduced similar Sinovel, Goldwind and other Chinese domestic wind turbine equipment leading enterprises, has reached more advanced international level of manufacturing wind turbines. Currently there are about 80 local Chinese wind power generators around the manufacturer, SKF have crossed roller bearing with most of them.Mr Stefan Karlsson SKF executives of leading enterprises of Chinese fans, said: "Although China has reached international advanced level leading wind turbine, wind turbines have several years of operating experience, to go through the test of time in the long run, fans of quality problems is the relationship between the nature of the final cost of the problem. domestic wind turbine manufacturer in the measure of costs have a feature often easier to consider only wind turbine manufacturing costs, but it ignores some important aspects, that is, wind power machine throughout its life cycle subsequent running costs in the Chinese market, SKF's main competitors or those who have international background of the imported bearings manufacturers for the domestic wind turbine manufacturers, they are more willing to choose some meet international quality standards. "SKF already has five technology platforms (bearings and units, seals, lubrication systems, mechatronics and services) of the product, this time, SKF Group to bring its quiet operation of wind turbine bearing, separable high bearing cylindrical roller bearings and WindLub centralized automatic lubrication system unveiled three new new State Fair.SKF became known in the field of wind turbine component suppliers in mainland China where most of rotation of the fan unit with all their bearings and other products. In China, SKF bearing company has more than 4,000 employees, more than a dozen manufacturing plants, two services provided by SKF industrial solutions SKF factories and a college. Sales of 5.4 billion yuan last year, the wind energy sector SKF product sales accounted for the proportion of total sales of 5%.

However, in the maintenance or replacement work

Clean the rolling NSK bearings is very important. NSK Bearing ring rolling surface and the rolling elements of the surface roughness is typically 1/10 μm, such a smooth surface of pollutants are very sensitive to damage. A lubricating layer between the rotating surface is generally 0.2 ~ 1 μm, a particle size larger than the lubricant-type impurity will be rolled over the rolling element bearings in the NSK partial pressure produced in steel, fatigue will eventually cause permanent. In addition to this, the external environment in the dust particle size of up to 10 μm, NSK bearings will also cause damage. Therefore, clean dust-free environment for NSK Bearings storage and installation is critical.
????Fully prepared to install
NSK Bearings should carefully using a suitable tool installation and removal. Industry experts estimate that premature failure of NSK Bearings 16 percent of cases are due to incorrect installation. For large installations (for example in the production of the device) is concerned, usually installed strictly controlled conditions, you can use the appropriate NSK bearings installed equipment.
However, in the maintenance or replacement work, the environment is varied. Therefore, to ensure the longest life of NSK ball bearing manufacturer, comprehensive preparatory work on NSK Bearings installation is necessary.
First, the relevant documents, such as drawings, maintenance manuals, brochures and other products require careful study. Next, all NSK Bearings components, such as shafts, the distance ring, cover, washers, etc. must be kept absolutely clean and free from contamination. Adjacent parts of the state should be carefully examined.
Careful installation and removal
According to the different applications and NSK crossed roller bearing size and type, choose the appropriate installation method (mechanical or hydraulic) and tools. Here is the NSK bearings installed some basic principles:
1 Do not install the force applied to the rolling elements, which can easily lead to the rolling element and the contact surface of the seat of local overload, leading to premature failure of NSK bearings.
(2) Do not use any hard tools (such as hammers, screwdrivers, etc.) directly to knock on the surface of the NSK bearings, NSK bearings which can cause breakage or fragmentation rings.

This method for a large amount of retained austenite thick

 heat up Method
cross bearing steel quenched martensite by the quenching , a small amount of undissolved carbides and the second about 12 % to 14 % of residual austenite . Quenched martensite and residual austenite is stable organization during tempering martensite decomposition volume contraction of the steel , and the decomposition of the residual austenite volume swell of the steel .
As the tempering temperature increased, the amount of decomposition of the residual austenite increases , the hardness required to ensure the process conditions, an appropriate increase in the tempering temperature , the residual austenite decomposition into the larger specific volume of martensite organizations can work volume increases accordingly , that the relative increase in the outer diameter grinding , using this method can make the bearing ring defects in the normal China bearing manufacturer conditions as scrap parts was saved.
This method for a large amount of retained austenite thick , heavy workpieces ( especially for self-aligning roller bearings ) effect was significant. The actual production of different specifications, different sizes, different thicknesses of parts developed different tempering process , to ensure the hardness and deformation under the premise that organizational change sufficiently to produce large rose -shaped , with a corresponding increase in the amount of grinding , save waste .

Three chemical deposition method
For dimensional tolerances beyond the design standard bearing parts , chemical deposition method can be used to save . The principle of chemical deposition through a variety of chemical raw materials of the chemical reaction of the surface of the part evenly certain thickness of metal coating , by attaching the metal layer and tempered to ensure hardness of the original parts and mechanical performance of the same . Chemical deposition only increased the size of the parts , without changing the shape of the part tolerances , the tolerance for dimensional tolerances of parts , by chemical deposition is an effective way to save , at present , the maximum thickness of up to about 0.1mm unilateral deposition .

including for high-performance green building design

Northeast Asia, SKF roller bearing : SKF distribution center in Northeast Asia to start buildingSKF bearings sales center in Northeast Asia, SKF (SKF) in the northeastern part of Shanghai Waigaoqiao Free Trade Zone opened a new distribution center to start building. SKF start building distribution center in Northeast Asia marks, SKF Northeast Asia Pacific region initially built a global network, then, China and the entire Asia-Pacific region will be achieved within a shorter delivery time better delivery rate.
 SKF Northeast Asian distribution center, located in the Waigaoqiao Free Trade Zone in northern Haidong, with a total investment of about 100 million kronor. Will be fully bearing catalogue in 2013. SKF has a distribution center in Northeast Asia 30-meter automated storage and retrieval systems (ASRS) automatic storage center. SKF to open distribution center in Northeast Asia is also under construction LEED standards (LEED standards established by the U.S. Green Building Council, including for high-performance green building design, construction and operation of a series of rating system) for construction, SKF distribution center in Northeast Asia will Be SKF (SKF) first energy and environmental Design certification under (LEED) gold standards for the construction of warehousing center. 2011, SKF in the world with 11 meet LEED standards for construction projects started.LEED standard SKF distribution center in Northeast Asia, but also to strengthen SKF SKF's long-term commitment to environmental sustainability, which is also reflected in the SKF SKF recently implemented angular contact ball bearing zero (BeyondZero) strategies. SKF has a distribution center in Northeast Asia Logistics Group is the world's best methods of operation and the most advanced logistics infrastructure to better support the SKF Northeast Asia, dealers and customers, and with it, SKF will be shorter delivery cargo delivery period to achieve a better rate. SKF Northeast Asian distribution center will serve the entire northeast region, becoming SKF in North America, Latin America, Europe and Asia, which consists of regional distribution centers as part of a global network

SKF acquired General Bearing Co., Ltd. (GBC)

weden SKF taper roller bearing Group acquired the U.S. GBC According to aspects of SKF bearings distributor in China, the world's leading bearings, seals, mechatronics, services and lubrication systems suppliers - Swedish SKF Group in February 13, 2012 announced a $ 125 million acquisition of New York-based GBC bearing manufacturer (General Bearing Co., Ltd.). Acquisition (GBC) General Bearing Company in full compliance with SKF (SKF) use other brand product lines complement development strategy to further strengthen SKF (SKF) brand in other areas not covered by the market growth.I am honored to be joining SKF Group expects will be able to accelerate the profitable growth of the bearing business, we emphasize the economic benefits of overseas production, General Bearing Corporation (GBC) in China's successful track record will make the SKF Group unleashed, can Help SKF better serve these important markets. "General Bearing Co., Ltd. (GBC), Mr. Chairman and CEO David Gussack talked about in this acquisition General Bearing Co., Ltd. will serve as SKF (SKF), a subsidiary of the Group to continue to operate independently. SKF acquired General Bearing Co., Ltd. (GBC), whose main brand is General and Hyatt, General Bearing Company, under the leadership of Mr. David Gussack use of their factories in China for the U.S. automotive market and heavy marketing services, business development quite successful .
 SKF distributor in China with your look (GBC) General Bearing Company: GBC was established in 1955, headquartered in the United States  (West Nyack); in China has four factories: where a ball bearing factory, two home tapered roller bearings factories and a precision roller factory; total 1,750 employees, of which the United States 140, China 1,610 names; 2011 period, GBC expected sales of about $ 155 million, and its operating margin and Skye Rover Group considerably. General Bearing Corporation (GBC) focus on its service industry supporting customers (OEM) and end-user capabilities, especially in trucks, trailers, automotive and industrial markets.

Hunan Timken Company general manager

Hunan Xiangtan city leaders to guide the work of Timken CompanyTIMKEN TIMKEN roller bearing Company China Limited Hunan Xiangtan municipal leaders 2010.04.30 Tao , deputy inspector of new water Deputy Minister , Office Yuan Xihui City Code , City Code Office deputy researcher Wu Ming and other city leaders to Hunan Xiangtan Timken company guidance . Hunan Timken Company general manager , Mr. James Ai Gete water to guide the work of the new pottery reported Hunan TIMKEN COMPANY , and government leaders attach importance to and guide the company deeply grateful. Xiangtan City , Hunan Leading Tao fresh water to guide the work of Timken Company , said: "The government will be great support from the policy , the working group at any time improve coordination of services , the company provides a good investment environment . Provide good service for the enterprise , and effectively solve problems for them . "About Timken Company in Hunan : Hunan Timken China bearing manufacturer Company is the world's largest earlier this year by the United States, one bearing manufacturer Timken Company and Xiangtan Electric Manufacturing Co., Ltd. joint venture , mainly the production of large wind turbine drive spindle Timken bearings , located in Xiangtan high-tech Zone industrial Park in Germany , is the Timken in China 's first six plants. (Timken bearings distributor in China Editor )

TIMKEN bearings thermal power industry applications

 We know that the thermal power industry are generally more harsh environments such as mill equipment must be dust pollution, high speed operating environment in order to avoid issues such as maintenance and downtime , so its relevant components of the device is quite high technical requirements especially spherical roller bearing and other components required quality and performance is outstanding , Timken Company, as many years of thermal power industry suppliers , and how to meet the requirements of the thermal power industry customers do ? Timken bearings distributor in China will take you to see this TIMKEN spherical roller bearing thermal power industry applications.
Thermal power industry an important machine mill , and mill roller bearing on the working environment is dust, high temperature low and insufficient lubrication of the environment, this has led to coal grinding equipment gearbox mounting or improper lubrication and reduce efficiency , Timken bearing thermal power industry in order to help solve these problems , the accumulation of years of experience under TIMKEN bearing technology has developed a lot in this regard Timken bearing products such as Abrasive bearings , DuraSpexx power density range of bearings and solid lubricated bearings. This column bearings can be used in harsh operating under production conditions , and the ability to extend the equipment uptime , which help customers improve the mill , gear boxes, and air preheater , conveyors and other equipment performance.

With the rising fuel efficiency of cars on demand

 JSAE Paper Award for outstanding scientific .1951 by the Japan Society of Automotive Engineers was founded in order to enhance achievements in the field of automotive. NSK to the "temperature on the toroidal CVT transmission analysis" as the theme of the paper better articulated and demonstrated NSK CVT transmissions to improve fuel efficiency point of view, therefore, the solution NSK won JSAE Angular contact bearing scientific paper award.  With the rising fuel efficiency of cars on demand, there is a greater transmission efficiency of large-scale motor vehicle continuously variable transmission and a corresponding needs. NSK to the "temperature on the toroidal CVT transmission analysis" as the theme of the paper, the purpose is to help in the calculation and verification of the proposed increase in temperature toroidal CVT transmission with a standard formula for empirical data to help predict toroidal CVT gearbox transmission efficiency more accurately in further improve vehicle fuel efficiency measures thesis literature. And NSK Pacific Convention Center in Yokohama, Japan on May 19 to 21 on the Automotive Engineering Exposition held roller bearing the toroidal CVT transmission, highlighting NSK transmission technologies to improve fuel efficiency. NSK won the 60th JSAE Paper Award is outstanding scientific NSK transmission technology research in the affirmation that we provide will enable NSK NSK Bearings more efficient products and services, as well as a product manufacturer NSK, will further reduce the realization of energy losses contribute to global sustainable development

Timken Wind Energy Manager Doug Lucas

Timken through Germanischer Lloyd Wind Power Industry Technology Certification Timken bearings distributor in China Timken company learned from the United States, May 26, Timken global operations through technical monitoring authority Germanischer Lloyd Wind power industry technical certification, Germanischer Lloyd Wind power industry technical certification is a Timken Ball bearing company technology and wind power wind turbine condition monitoring system the best explanation.It is understood that representatives of Germanischer Lloyd last year visited Timken Company is headquartered in Canton, Ohio, technical center and near Fairbanks Crest steel mill. Used for the wind power industry dynamics Timken tapered roller bearings and cylindrical roller bearings rated load and bearing life test performance affirmed.
 Timken Wind Energy Manager Doug Lucas, Mr. Timken through Germanischer Lloyd in the wind power industry technical certification spoke: "Germanischer Lloyd certification is for us for the wind power industry TIMKEN bearing a technical assessment of the reliability of prove our wind power industry has a bearing more reliable than other brands, more extensive product design, we can achieve a longer Special bearings life, while reducing the wind power industry and lowering Chen. " Germanischer Lloyd Certification is Timken's proprietary Syber advanced system and bearing fatigue life testing, continues to this day for decades validation, Timken bearing various types have the ability to wind turbine bearings for the global wind power Timken industry to provide more  About Germanischer Lloyd: Germanischer Lloyd has 140 years of history, the ship testing, research and improvement of security is a world leader. In the field of wind power, wind energy Germanischer Lloyd Industrial Services department is mainly provided from materials, parts, machine to wind farm inspection, certification and other services.

the Japanese bearings, automotive products

NSK established a joint venture with Toshiba Corporation2010.10.29 NSK distributor in China editor, recently, the Japanese Big ball bearing, automotive products, precision machinery parts, and machinery and electronics products manufacturer Seiko Co., Ltd. (NSK LTD.) And the world's top 500 industrial, mechanical and electrical industries in Japan relatively large monopolies Toshiba joint venture company established ADTech automotive steering systems. ADTech joint venture total investment of about 500 million yen, about 60 employees, the main objective is to develop an effective integration of NSK, electronic, mechanical, and other vehicle safety technology experience and Toshiba advanced electronics and software technology automotive steering systems. NSK and Toshiba hopes that the demand of the system as the number of green vehicles increases, because, compared to hydraulic power steering, electric power steering system is more energy efficient. NSK established a joint venture with Toshiba ADTech NSK Steering Systems, the joint venture will own a 51% stake, while Toshiba will occupy a total investment of 200 million yen ($ 2,480,000 aggregate) 49% of the shares. About NSK NSK China introduce and Toshiba Corporation: Seiko Corporation of Japan (NSK LTD.) Was founded in 1916, is Japan's first domestic design and production of angular contact ball bearing. For decades, NSK NSK developed countless new bearings, to meet the needs of users around the world, and for industrial development and technological progress have made a great contribution. NSK also by virtue of its precision machining technology, continuous development of automobile parts, precision machinery components, precision products, electronic applications in the field of active diversification. Toshiba Corporation is a Japanese multinational companies. Japan's relatively large electromechanical industry monopoly. Predecessor was founded in 1875, Tanaka Seisakusho. 1893 was renamed Tokyo Shibaura Seisakusho. 1934 and Tokyo Electric Company merger, said Tokyo Shibaura Electric Company. Headquartered in Tokyo. Toshiba Corporation is closely related with the U.S. General Electric Company. The company's products very much, mainly in the heavy electrical equipment, industrial electronic equipment and electronic components, consumer electronics and other products. 1970s to develop atomic energy, ocean development and space development and other industries.

NTN bearings distributor in China with customer-oriented sales

 NTN NTN Big ball bearing distributor in China is the world's integrated manufacturer of precision machinery, NTN Bearing is the world's fifth-largest supplier, in 1918, Mr. Niwa (Noboru Niwa), located in Kuwana, Mie Prefecture Kuwana-gun cho rise within the [West Park Rail workers are] began to study and production of ball Ball bearing company, NTN Corporation and later by the first letter of his name names. Established until 1960 produced by Toyo Bearing Iwata. Began mass ball bearings. 1989, changed its name to NTN Corporation. 2000, NTN Bearing Group's products all passed the ISO 9000 series certification. NTN bearings distributor in China with customer-oriented sales philosophy get more customers. Meanwhile accurate and timely manner to meet the needs of enterprise customers nationwide. NTN bearings distributor in China sales of imported NTN NTN products are trading company in Hong Kong to provide, its quality and quality won the praise of customers in China, the region has a large market share. Provide a variety of products from ball bearings, roller bearings tapered roller bearings to the different categories. NTN Bearing products include deep groove ball bearings, small and miniature ball bearings, self-aligning ball bearings, angular contact ball bearings, cylindrical roller bearings, tapered roller bearings, self-aligning roller bearings, thrust bearings, special and multi-functional use bearings. NTN bearings are widely used in various automotive, OA office equipment, industrial machinery bearings and some special areas such as environmental and food hygiene.

"When 15,000 people sitting in the center court area

"When 15,000 people sitting in the center court area , we may encounter unpredictable winds and other weather conditions, bearing on the open roof support is critical . Safety, reliability , low maintenance requirements of this project is particularly important. bearing life of 20 years to 25 years between the bearing grease lubricated to ensure easy maintenance and has a long service life . "Salthouse added.Salthouse said Mr. Schaeffler UK technical support
roller bearing mounting typical example is to provide guidance . " Schaeffler UK engineers provide comprehensive advice and guidance , greatly accelerated the assembly process ." Salthouse said.Attachment: Wimbledon Centre Court introduced a new retractable roofRoof both open or closed can provide robust and secure ( does not slip ) of the venue. In the closed position , the natural light through the translucent roof exposure to the grass in any adverse weather conditions can play a protective role on the grass . Roof design itself as " collapsible hexagonal design ", when not using the roof , the roof can be folded into a high compression zone. Even the roof closed, the roof can also create a transparent "open" feeling. The entire roof area of ??5200 square meters, developed by a special waterproof material , very strong and full of flexibility. The key elements of the roof design when the roof is in the closed state, a lot of natural light can be irradiated to the grass. Airflow system from the closed space of the condensation detached , so as spectators and players and provide a most comfortable environment inside .Retractable roof comprises a total of nine base plate is divided into two parts: one is 4 , and the other part of the 5 . On either side of each plate are fixed with angled steel . There are 10 frames across 77 meters of the stadium . Each steel wheels supported by a set of ports can be installed in the center court along both sides of the China bearing manufacturer move . Ready to close the retractable roof , the northernmost part of the stadium to keep the folded state , parked in another part of the southern end . To ensure the accuracy of the roof moves , you need to install a high-precision electronic actuators, servo motor and rocker synthesis system . This system will separate the steel , while steel between the upper and the steel parts of substantially begin until the two parts of the top center of the pitch joints combined stacked flat . Steel is installed on the bottom of the hinge a number of similar components. Schaeffler FAG spherical roller bearings assembled in these hinge . These bearings due to friction is small, and can be carried out right kind of compensation is selected. These bearings are grease lubricated through high-performance , during use, requires minimal maintenance

Belts, bearing wear abnormal sound.

Discrimination power, transmission line fault causes abnormal sound
Car work sound vibrations of the system referred to as the sound of cars, many failures are manifested through abnormal noise, abnormal sound is phenomenal, the fault is the essence. If not timely troubleshooting can easily cause significant mechanical accident.Automotive common abnormal sound can be divided into powertrain abnormal sound, abnormal sound transmission system, driving system abnormal sound, drag abnormal noise and other categories.
1, powertrain abnormal sound
Failure occurred mainly in the engine and its related components, abnormal noise with the engine speed and change, and the frequency is higher.a. Off-cylinder engine misfire.
b. Decrease the efficiency of the engine lubrication system caused by excessive friction parts.
c. spherical roller bearing, bearing wear abnormal sound.
2, abnormal sound transmission systemDriveline abnormal noise often comes from gearbox, differential, clutch and other components with abnormal sound gear and clutch showing a significant change in status change.3, the driving system abnormal soundDepartment of abnormal noise and driving car driving status (speed, steering) are directly related.4, the drag noise
Vehicle reaches a fixed value abnormal sound obvious, speed decreases abnormal sound disappears. Mentioned here non-normal drag caused abnormal sound. Such abnormal noise caused by the flow separation around the body Special bearings changes generated noise. Specifically including cavity resonance, noise catheter tube and the antenna, wiper, mirrors and other accessories vibrations caused spoiler. Seal open, plastic parts can cause rupture of the exterior curve changes caused by traveling to the high speed air spoiler form abnormal sound.

ot exposed to external weather conditions

FAG spherical roller Roller bearing are used in new Wimbledon Centre Court retractable roofLift the Wimbledon Centre Court , and perhaps someone knows , but you notice the stadium roof , Wimbledon Centre Court retractable roof of a new major feature is translucent, retractable roof , this is how a unique creative roof ah , but this decorative building structure , there is an important role in the structure responsible for its open or close in ten minutes , what is it ? Closer to home, the open and close are inseparable FAG row radial ball roller bearings in this retractable roof is equipped with 300 FAG radial spherical roller High speed bearing and spherical roller thrust bearings, FAG bearings to ensure these stadium roof within ten minutes in the open or closed.Schaeffler for the project provided a total of more than 300 bearings. These bearings consist of fag-aligning roller bearings , mainly used for supporting both ends of the roof arch hinge radial load and thrust roller bearings for supporting the roof of the cable taut expand the axial loads. Provide maximum self-aligning roller bearings, an outer diameter of 200 mm , can withstand 300kN (30 tonnes) standard radial load , mainly used at both ends of the arch bracket hinge . Thrust roller bearings will assume approximately 600kN (60 tonnes) of the axial loads that are supported by the support structure and roofing materials arched cables produced .Since the bearing is completely sealed in the hinge group, not exposed to external weather conditions . In other words, Schaeffler can choose from standard products, bearings, its easy to use and offers . These bearings are filled with high-quality internal grease when the roof is expanded , and in the center of the stadium at the top is closed, the top of the dome architecture designed to help building forces from wind, rain , snow pressure.

Steel is installed on the bottom of the hinge a number of similar components.

Retractable roof comprises a total of nine ball bearing manufacturer plate is divided into two parts: one is 4 , and the other part of the 5 . On either side of each plate are fixed with angled steel . There are 10 frames across 77 meters of the stadium . Each steel wheels supported by a set of ports can be installed in the center court along both sides of the track move . Ready to close the retractable roof , the northernmost part of the stadium to keep the folded state , parked in another part of the southern end . To ensure the accuracy of the roof moves , you need to install a high-precision electronic actuators, servo motor and rocker synthesis system . This system will separate the steel , while steel Slim bearing the upper and the steel parts of substantially begin until the two parts of the top center of the pitch joints combined stacked flat . Steel is installed on the bottom of the hinge a number of similar components. Schaeffler FAG spherical roller bearings assembled in these hinge . These bearings due to friction is small, and can be carried out right kind of compensation is selected. These bearings are grease lubricated through high-performance , during use, requires minimal maintenance

Since the bearing is completely sealed in the hinge group

 Schaeffler for the project provided a total of more than 300 bearings. These bearings consist of fag-aligning roller bearings , mainly used for supporting both ends of the roof arch hinge radial load and thrust roller bearings for supporting the roof of the cable taut expand the axial loads. Provide maximum self-aligning roller bearings, an outer diameter of 200 mm , can withstand 300kN (30 tonnes) standard radial load , mainly used at both ends of the arch bracket hinge . Thrust roller bearings will assume approximately 600kN (60 tonnes) of the axial loads that are supported by the support structure and roofing materials arched cables produced .

        Since the slewing bearing manufacturers is completely sealed in the hinge group, not exposed to external weather conditions . In other words, Schaeffler can choose from standard products, bearing catalogue, its easy to use and offers . These bearings are filled with high-quality internal grease when the roof is expanded , and in the center of the stadium at the top is closed, the top of the dome architecture designed to help building forces from wind, rain , snow pressure.

         Schaeffler UK product support engineer Derek Peasley , Mr. Tsang and Street CraneXpress company's engineers work closely together. He said: " We are very pleased with the Street CraneXpress company in this prestigious project together from the design process, we have the company's professionalism impressed , we are convinced that the selected bearing in this grim application environment, good performance . "

To achieve these goals

 Even for experienced plant manager, the construction of new power plants or existing plant operators are likely to be a big challenge. Must achieve and maintain optimal security, reliability and availability. To achieve these goals, we must develop a reliable and cost-effective maintenance plan, usually need to limit the number of personnel and expenditures. This requires an organized, dedicated integrated equipment reliability (IER) program, which the plant's CMMS or EAM system seamlessly to the existing number of personnel and technology will be able to manage.SKF Bearing Company of the thin section ball bearings of integrated equipment reliability program
To bring best practices knowledge Experiences using other plants Development of cost-effective PdM activitiesIntegrated hardware, software and data configurationSmall impact on staff Rapid results Use of existing tools and techniqueSweden SKF the roller bearing company Applications integrated device reliability program case:In the 15 plants have 27 coal and gas supply companies operating unit is facing reliability and performance issues. The goal is to reduce equipment failure, appropriate centralized maintenance resources. SKF has developed a proactive maintenance program, focusing on critical equipment planned maintenance and major failure mechanism. As more attention to the task of those states to monitor and eliminate unnecessary tasks, the plant reduced maintenance costs, SKF Bearing solutions and improve the availability and reliability.

Germany FAG Bearing Group Automotive Division: skilled

Schaeffler Group's three active Division
        With FAG, LUK and three strong brands INA Schaeffler (Germany FAG bearings) Group, its mainly active in the automotive division, industrial and aerospace division Division.  Germany FAG Bearing Group Automotive Division: skilled, powerfulSchaeffler Group's largest customer is the most important automotive industry, about 60% of the slim bearings Group's sales from the automotive industry, the Schaeffler Group, as an almost all major automobile manufacturers and suppliers a reliable partner, FAG bearings Group Automotive Division for the entire drive train, passenger commercial vehicle engines, chassis, transmissions and other parts units and suppliers to provide the most professional knowledge and innovative ideas and products. Germany FAG Bearing Group spherical roller bearing Division: aerospace equipment and aerospace manufacturing partner of choice Germany FAG Bearing Group Aerospace Division to support the development and production of special bearings for aerospace applications. Almost all aircraft using modern techniques to accomplish FAG Bearings, FAG is to become the world's leading technology development partners helicopter manufacturers and suppliers.

Tapered roller bearings is the largest amount of single row tapered roller bearings

Tapered Roller Bearings defined Alibaba mechanical 2012-03-19 Source: Alibaba mechanical information themes: mechanical printing machinery] [Alibaba tapered roller bearings can be separated from the inner ring with roller and cage assemblies and components outside ring can be installed separately. Roller and raceway contact at the contact line can reduce the stress concentration. Tapered roller bearings can withstand high radial and axial load. The tapered roller bearings can only pass one-way axial load, so as to pass the opposite direction of the axial load on the need install another with symmetrical tapered roller bearings.
Tapered roller bearings is the largest amount of single row tapered roller bearings. In the car's front wheels in recent years to spend the small size of the double row tapered roller bearings. Four tapered roller bearings used in large-scale cold high speed bearing mill and other heavy machines.
Single row tapered roller bearings have an outer ring, the inner ring and a set of tapered roller by a box-type cage into an inner components. Outer and inner component separation, tapered roller high speed bearings according to ISO standard dimensions, any standard model of a tapered roller bearing outer or inner component and the outer or inner components of the same model to achieve international interchangeable. Except that portion of the outer ring of the same model dimensions, tolerances must comply with ISO492 (GB307) requirements, the cone angle of the inner components, component cone diameter must also comply with the relevant provisions of the swap.
Typically, single row tapered roller bearing outer ring raceway of the cone angle of 10 ° ~ 19 ° before to be able to withstand the load and radial load bearing joint action. Cone angle larger axial load capacity are greater. Large cone angle of the bearing, post code plus B, cone angle between 25 ° ~ 29 °, which can withstand greater axial load. In addition, single row tapered roller bearings can be adjusted during installation size of the clearance.

Three crowned as the world 's most ethical companies list

The Timken Company always adhere to the quality of corporate brand competitiveness
The Timken Company is a corporate bearing corp named after the founder's family . Only products that meet the quality standards of the company , will be engraved with the Timken brand. As a global leader in Industrial Technology , The Timken Company has always believed that corporate brand reputation and glory of the family , is equally important.
Adhering to this concept, located in the national high-tech zones Xiangtan Iron Mu Kenxiang electricity ( Hunan ) Bearings Co. , always practicing , practicing corporate core values. Recently, the reporter visited the company's general manager Mr. Zhong Zhiyong .
Quality is the key to maintaining the competitiveness of products
"Quality is a core value of The Timken Company , is one of the cornerstone of our brand promise ."
Timken has a unique quality management system TQMS, production globally consistent quality product , whether it is in the United States , or in Europe or China . Xiangtan plant products have passed the certification Timken brand , which means that we localize the overall quality management system of Timken 's global headquarters recognition ."
In addition, Xiangtan plant also passed the ISO9001 quality management system, ISO14001 environmental management system, OHSAS18001 occupational health and safety management system certification.
" Compared with these certifications , Timken 's own strict quality management system to many , the assessment points turned over several times , and our products must meet strict quality system that can only be delivered to the customer ."
Three crowned as the world 's most ethical companies list
March 12, 2013 , more than 100 countries around the world 36 sectors of the many companies, high speed bearings in commercial practice and adhere to abide by the principle of good faith has played an exemplary role , Timken 3rd boarded the U.S. Ethisphere Institute released " world's Most ethical Companies list ." U.S. Ethisphere Institute (EthisphereInstitute), is a commitment to advancing corporate governance, risk management, sustainable development , compliance and business ethics best practices in the field of international institutions .
For this award , Zhong Zhiyong very identity . Because they each do one thing they have to consider: how local laws and regulations is required ? Compliance is a prerequisite for survival , also in line with the core values ​​of Timken 's first ethics and integrity .

Schaeffler in Suzhou Industrial annual dealer meeting held in 2013

The theme of "intensive farming? Total development" Schaeffler Greater China 2013 annual dealer meeting industry located in the beautiful Jinji Lake in Suzhou hand pallet trucks Hotel was successfully held. Schaeffler AG, member of the Executive Committee, President of Schaeffler Group Industrial Robert? Shulan President (Mr. Robert Schullan), Schaeffler Asia Pacific President and CEO, Greater China Managing Director and Industry Division President Pack Yu Mr Tudor (Mr. Udo Bauer) and other company leaders and hundreds of dealers partners attended the meeting.
Around the "intensive farming? Total development" theme, from Schaeffler headquarters, the Asia-forklift jacks region as well as the leadership of the Greater China business development respectively Schaeffler, the current market situation, to face the opportunities and challenges, channel development strategy , dealer management policies as well as the application of new products and technologies such as reseller partners concerns were wonderful keynote speech, and dealer partners raised expectations. In order to jointly cope with challenges of the market, improve the comprehensive competitiveness of dealers, Schaeffler first dealer partners to share the business operations management experience and after-market business development of practical experience.

technology development and production at the coincidence is very limited

ubrication systems Lincoln Industrial new membersSKF China distributor in Sweden SKF Group global video conference that, SKF lubrication systems to expand the U.S. aftermarket and increased SKF company in North America and Asian markets and enhance market coverage SKF's production capacity, and determine its lubrication system increase in membership - Lincoln Industrial.
SKF thin ball bearings distributor in China, according to introduction, SKF Group will be $ 1 billion cash acquisition is headquartered in St. Louis, Missouri, United States Lincoln Industrial lubrication system manufacturers, this new member of SKF lubrication systems Lincoln Industrial, the current SKF lubrication existing ball bearing has a high complementary value in the market area with SKF, technology development and production at the coincidence is very limited, especially in North America and Asia.
The increase SKF include Lincoln (Lincoln), Arnie Mitt (Alemite) and Rui Technology (Reelcraft) all business entities and brands. SKF Company believes that the acquisition is completed to bring more and better sales channels and better operating efficiency, the company gained a great synergy. The acquisition will be earnings per share thickening of the company, the acquisition using the company's existing cash and credit tools. In addition, Lincoln also enable industry to get into the North American SKF lubrication tools and equipment aftermarket better channels.

packing curve roller bearings

As a Chinese professional logistics drive accessories manufacturer, we offer a wide range of professional logistics conveyor rollers, pipeline transportation composite wheel, forklift chain, roller, such as packaging, printing machinery with shaft roller bearings The company specializes in production of packaging, printing machinery with shaft roller bearings. At present our production of roller bearings, have been exported to USA, UK, Europe and other countries and regions, won the praise of customers. Now our company has developed a large variety Inch roller bearings, packing curve roller bearings, bearing roller bearings, bolt-type roller bearings and needle roller bearings. Models are CF4, CF5, CF6, CF8, CF10, CF10-1, CF12, CF16, CF18, CF20, CF20-1, CF24, CF24-1, CF30, CF30-1, CF30-2. Etc.separable bearings. Under normal circumstances, especially in GB/T307.1-94 "Rolling bearing company tolerance" are involved in a range of sizes within the tapered roller bearing outer ring and inner components can be interchanged between one hundred percent use. The angle of the outer ring and the outer raceway diameter size has been standardized with the same size and shape provides. Not allowed to change in design and manufacturing. To cause the tapered roller bearing outer ring and inner components available in the world between interchangeable. Tapered roller bearings are mainly used to bear radial load mainly radial and axial joint load. And angular contact ball bearings, bearing capacity, low speed limits. Tapered roller bearings can withstand axial load in one direction, the shaft or housing to limit axial displacement in one direction.

it indicates that the bearing has failed.

 needle roller bearings operating under conditions such as high speed , and high operating temperatures , special attention should be rotating rings can not be too loose to prevent eccentric , as well as non- fixed ferrule with a gap to prevent sleeve ring deformation under load and to stimulate vibrations.

Rolling in the work allow slight noise , if the noise is too large or unusual noise or crash, it indicates that the bearing has failed.

Preload is the slewing ring bearing assembly to the inner or outer ring an axial force to remove the needle bearing clearance , and to move the body and the inner and outer contacts generated at the beginning of deformation. Preload can improve the working condition of the bearing stiffness and rotational accuracy , load bearing large , rotating high precision angular bearing , mostly in the absence of even a small amount of clearance over the work of state interference , in which case it required in the assembly, the bearing preload . Clearance and preload adjustment are usually seen by the inner ring relative axial displacement of appropriate methods to complete. From the above process is not difficult to learn concepts , through to move the bearing clearance adjustment , can improve the bearing capacity and rotation accuracy , progressive bearing life. But at the same time make the bearing frictions , fever increases, so the clearance or preload adjustment when necessary to ensure good lubrication and heat dissipation. If improperly adjusted or poor lubrication , it will in turn cause increased bearing wear , reduced life expectancy .

Rolling repair conditions and methods

Rolling is the mass production of mechanical parts, and manufacturing precision requirements are very strict, technically high degree of specialization, so for the most readily available bearing varieties, it should be more economical to purchase than repaired, and only in the following cases before considering the bearing fix the problem, namely:
(1) a large number of large factories are using the same type of angular contact ball bearing failure mainly in the form of its rolling surface wear, fatigue or fretting abrasion, especially damaged parts mostly cage or rolling, while still ring or gasket repair value;
(2) large and extra large bearing on the brink of failure or having lapsed and no significant damage parts, or precious bearings must seek to extend its useful life is;
(3) some really difficult to buy into the bearing varieties, after the failure had no spare parts and repair, especially imported bearings;
(4) bearing a slight injury, such as inventory produced during the mild water, rust, and transport process produces a slight micro abrasion, such cases repaired easily and gesture.
In addition to economy outside bearing repairs as well as its technical, requiring repairer fully understand bearing the corresponding technical requirements, with the bearing and parts in the structure, process and on the characteristics of the material, it would be difficult to ensure the bearing repairs have desirable results.

Off-cylinder engine misfire

Automotive common abnormal sound can be divided into powertrain abnormal sound, abnormal sound transmission system, driving system abnormal sound, drag abnormal noise and other categories.
1, powertrain abnormal sound
Failure occurred mainly in the engine and its related components, abnormal noise with the engine speed and change, and the frequency is higher.a. Off-cylinder engine misfire.
b. Decrease the efficiency of the engine lubrication system caused by excessive friction parts.
c. Belts, angular contact ball bearing wear abnormal sound.
2, abnormal sound transmission systemDriveline abnormal noise often comes from gearbox, differential, clutch and other components with abnormal sound gear and clutch showing a significant change in status change.3, the driving system abnormal soundDepartment of abnormal noise and driving car driving status (speed, steering) are directly related.4, the drag noise
Vehicle reaches a fixed value abnormal sound obvious, speed decreases abnormal sound disappears. Mentioned here non-normal drag caused abnormal sound. Such abnormal noise caused by the flow separation around the body pressure changes generated noise. Specifically including cavity resonance, noise catheter tube and the antenna, wiper, mirrors and other accessories vibrations caused spoiler. Seal open, plastic parts can cause rupture of the exterior curve changes caused by traveling to the high speed air spoiler form abnormal sound.

long-life low-noise high-temperature bearing grease

In the environment of high temperature and high grease used should have the following characteristics:
(1) no loss at high temperatures, i.e. at a temperature of about 180 ℃ maintain a certain consistency, is not softened.

(2) oil leak less. When the grease in the bearing catalogue to withstand repeated high shear and large centrifugal force, the lubricant can not promptly thrown back into the raceway.

(3) has a certain muted effect, a high temperature grease hardness fibers are generally large, so in the bearing noise test is far less than the acoustic performance of lithium-based grease.

(4) have a certain kind of high-temperature grease life at high temperatures with good oxidation resistance, thus extending the life of bearings and related equipment.

One bearing installation

Bearing must be installed in a dry, clean environment conditions. Should be carefully checked before installation of shaft and housing mating surface , convex shoulder face , grooves and connecting surface processing quality. All fit connection surface must be carefully cleaned and remove burrs, casting unworked surface must Ex residual sand .thin ball bearings installation should be preceded with gasoline or kerosene to clean and dry before use, and to ensure good lubrication, bearings generally use grease, oil lubrication can be . Lubricated with grease should be used free of impurities , oxidation , rust and extreme pressure properties of high-quality grease. Grease filling is bearing and tank volume of 30% -60% , not too much . With sealing structure of the double row tapered roller bearings and water pump bearing grease has been populated , the user can directly use, can no longer be cleaned.Bearing installation must be on the circumference of the ring face exert equal pressure , push the ferrule may not be a direct hit with a hammer prime tool bearing face , so as not to damage the bearings . In the case of a small amount of interference , it can be pressed at room temperature with sleeve bearing ring face , beating with a hammer sleeve , the sleeve will be pressed into the ring balanced . If large quantities of installation , can be used hydraulic press . Press-fitting , should ensure that outer end face and the housing shoulder , inner end face and the shaft shoulder pressed , does not allow a gap .When a large amount of interference , can be heated oil bath or induction heating device bearing method to install the heating temperature range is 80 ℃ -100 ℃, the maximum can not exceed 120 ℃. Meanwhile , the application of a nut or other appropriate methods tighten the bearing to prevent the bearing cooling after leaving the ring widthwise shrinkage gap between the shaft shoulder .Single row tapered roller bearings installed last clearance adjustment should be carried out . Clearance values ​​should be based on the use of different conditions and the amount of interference with the size of specifically identified. Necessary, should be tested to determine . Double row tapered roller bearings and water pump bearing has been adjusted at the factory clearance, installation without further adjustment .
Bearing rotation test should be carried out after installation , first hand rotating shaft or bearing housing , without exception, then in power for no-load , low speed , then gradually increase as the functioning of the rotation speed and load , and to detect noise , vibration and temperature , abnormal, should stop and check . Normal operation test before delivery.

Each series ball screw applications in all walks of life

Ball bearing screw is widely used in the dull top secret , but the difference between dull acceptance Ball is certainly not identical , Ka Machinery Co., Ltd. Nantong finishing difference in this ball of application areas :
Rotating Nut (R1) Series Ball : Semiconductor dull, dull industrial people , woodworking machines , laser processing machines, conveying devices.
Precision ground ball screws : CNC dull, Nanjing intermediate precision air conditioning vent thing machines, industrial dull , electronic dull, dull transportation , aerospace industry , the use of other antenna actuator , the valve switching devices.
Ball cap style : Fast handling system, as usual dull industrial automation dull.
Heavy Ball : All-electric injection molding machines, stamping machines, semiconductor manufacturing equipment , heavy-duty brakes, industrial dull , forging dull.
High DN value Ball : High-speed stuff , high-speed integrated processing center machine .
Rolled Ball Screws Level : low friction , smooth operation of the benefits and costs low while agile supply .
High-speed ball screw : CNC rigid , precision stuff machines, industrial dull, dull electronics , high-speed rigid.

Ball bearing under way force status classification

Single push thrust bearings are mounted on the ends and ball screw preload . Can improve the axial stiffness of the ball bearing screw ; pre-stretching resettlement , preload large, so screw things only suffer tension. But the essentials of the screw placement is more sensitive to thermal deformation , while bearing life than double push - push-push low . Push- push-push one pair of ends mounted thrust bearing and radial ball bearings portfolio, the screw has a maximum stiffness , which can be used at both ends of the double bearing , thrust bearing and last radial ball bearings, and impose tight top force . The essentials appropriate for high rigidity , high speed, high precision , precision ball screw drive system . However, this arrangement can essentials thermal deformation of the screw into the thrust bearing preload , so plan requires increase the thrust bearing stiffness of the bearing ability and bracket . Double push a simply supported at one end mounted type thrust bearing , a second end attached to the ball bearings , axial stiffness is not too high ; ball out of the use of thermal deformation should be too small and the impact of resettlement should be too small to make heat and screw things when away from the common section at one end mounted thrust bearing , thrust bearing due to restrained thermal elongation and bred gap . pushing a freestyle thrust bearing mounted at one end and the other end unconnected. Its end is the free state, so carrying ability of small , low axial stiffness

How to check the appearance of bearing

In the use of cross bearing, we first check the appearance of imported bearings, to determine whether it conforms to the standard we require. Here to share with everyone one that we should check that those parts. Bearings should be checked for astigmatism lamp, the appearance of the bearings, cracks and other parts of careful observation.

1, various mechanical injuries, such as rubs, scratches, bruised, bumps, etc., can cause adverse bearing installation, causing partial load and stress concentration, resulting in a decline in rotation accuracy and service life.

2, rust, black and pits, the latter two are easy to store moisture and dirt defects, the most likely to develop into rust. The corrosion is the cause poor installation, the sources of early wear and fatigue, severe corrosion cause bearing scrap.

3, various cracks, such as raw materials, crack, crack forging, heat treatment and grinding cracks, cracks, these cracks in the future during the operation of the bearing, will be a source of stress concentration and rapid expansion, resulting in rupture of the bearing of the bearing life and safety at work of great impact. In fact, for the important purpose bearings, bearing factory has 100% of its constituent parts or ray magnetic particle inspection.

4, peeling and folding, these two defective part and base metal binding is not strong, and its surroundings often exist to varying degrees, or depleted carbon decarburization phenomenon, materials easy caving, debossing or wear of the bearing life and accuracy are negative.

5, riveted or welded cage quality rivet head is mainly observed deviation, skew, relaxation, lack of meat or 'eyelid', the correct position of the welding, solder joint is too large or too small, whether strong or welding welding caused by excessive stuck rolling phenomenon more than a few that we focus on checking SKF bearings in part inspection, in addition to other than the part of the inspection, in addition to poor quality such as typing, such as illegible, damaged, shall be considered as defective, In severe cases, can not be accepted.

Requirements for machine tool spindle bearings

In the machine tool bearings, bearings is widely used. Spindle bearing with certain technical requirements. Introduce to you the following analysis

1 speed and temperature

With the development of science and technology, more and more high spindle speed, speed range and thus the greater the deep groove ball bearing high speed stability requirements are also increasing. Machine tool spindle bearing temperature is an important factor in limiting speed of the bearing. Under normal circumstances, the right choice bearing type, tolerance levels, configuration, clearance (preload) size, lubricants and lubrication, etc., to a certain extent, improve the speed performance of rolling bearings.

(2) carrying capacity and life

The general machine tool, the life of the main spindle assembly to maintain accuracy of the spindle is its period of use, therefore, required to maintain the accuracy bearing spindle assembly performance to meet life requirements. For heavy-duty machine tools or powerful cutting machine, you should first consider the bearing capacity.

3 stiffness and vibration resistance

To ensure the quality of the machining, the spindle system must have sufficient rigidity, otherwise it will have a greater re-mapping error even flutter. Vibration resistance refers to the forced vibration and self-excited vibration capability. Spindle assembly vibration resistance depends on the spindle and bearing stiffness and damping. Using the preload bearing can effectively increase the stiffness of the spindle system.

4 Noise

In high-speed grinder, the grinding noise and bearing noise is the main ingredient should be used in low-noise rolling bearings.

Vibration bearing vibration group selection

Vibration bearings and plain bearings of the different characteristics

    1, Appearance Features
    Vibration bearings:
    A. rolling diameter increased, the rolling body length increased.
    B. outer rib cage guided by the roller, the roller to reduce the force.
    C. Use of the inner wall to guide roller, roller improve functioning.
    D. cylindrical roller bearing cage with the overall structure, strength greatly increased.
    E. aligning bearing hole diameter tank design, lubrication effect.
    Plain bearings:
    A. roller bearing diameter and length of the rolling elements are small.
    B. cage with rollers or inner guidance.
    C. Cylindrical roller bearing cage using rivet structure, easy to loose, out cover.
    D. aligning bearing no sump hole diameter, lubrication poor results.
2, the choice of materials
    Vibration bearings:
    A. inner and outer rings and rolling bearing steel vacuum degassing, good fatigue resistance.
    B. cage aluminum manganese bronze material, high strength, good elasticity, abrasion resistance better.
    Plain bearings:
    A. inner and outer rings and rolling with common bearing steel.
    B. cage made of zinc brass, low strength, poor flexibility.
3, heat treatment
    Vibration bearings:
    A. inner and outer rings using shell - Ma Ma mixed hardening or quenching and tempering, uniform hardness, internal stress; toughness, shock and vibration.
    B. In the temperature less than 150C when working stability.
    Plain bearings:
    Inner and outer rings using ordinary quenching method, poor toughness, shock and vibration performance is poor, poor thermal stability.
4, tolerances and manufacturing process
    Vibration bearings:
    A. strict accordance with the P6 class precision manufacturing standards, especially in inner diameter tolerance is very small.
    B. ball size ≤ 0.002 Difference
    C. Cylindrical roller diameter of a convexity practice, to avoid stress concentration.
    D. rolling surface ultra-precision processing, smooth finish.
    Plain bearings:
    A. General PO level precision tolerances (part P6 class standard) manufacturing.
    B. rolling grouping ≤ 0.005.
    C. Cylindrical Roller without convexity practice.
    D. Part raceway only for polished finish low.
5, the internal clearance
    Vibration bearings:
    Clearance by mechanical vibration requirements of production, range control in a small range, and good consistency.
    Plain bearings:
    Clearance generally based on the standard group or group C3 production, clearance, or small, or range, discreteness.
6, using the results
    Vibration bearings:
    Low noise, low temperature rise, good stability, long life, no early fatigue.
    Plain bearings:
    Noise, temperature rise, stability is not good, life is short, there is the phenomenon of early fatigue.

Bearing vibration group selection

       With the bearing manufacturing technology has improved continuously, reflecting the dynamic performance of the bearing vibration and noise are increasingly valued by the people. Users of the bearing vibration and noise awareness of the technical characteristics are also increasingly sensitive requirements are also increasing.
     Bearing vibration refers to the geometric center of the bearing part is the instantaneous deviation from an ideal position moves, bearing parts with time-varying elastic deformation, and other rotary motion bearing all the movements necessary, known bearing vibration.
     For a single bearing vibration testing, currently using two units of measurement. One for Acceleration, which is measured in decibels (dB), category code Z1, Z2, Z3; another type of speed, which is measured in microns / second (um / s), group codenamed ZV1 , ZV2, ZV3. These flags bearing vibration group bearing the supplementary code into basic code on the right.
     Bearing vibration and noise are closely related, because the vibration source of the noise, the noise is vibration characterization, so in bearing manufacturing and testing process, through strict control of the bearing vibration value targets, to achieve the purpose of bearing noise control.
     In the choice of bearing vibration constituencies, must be based on the specific use of the bearing conditions. If the host for smooth operation have special requirements, you should choose more appropriate bearing vibration group to meet and achieve the smooth operation of its provisions, such as machine tool spindles. Of the bearing vibration and noise are a requirement, such as cars and aircraft, the same should be used in the corresponding bearing vibration groups in order to achieve the requirements. The noise of the bearing with special requirements, such as electric fans and some other appliances should be used with low noise bearings, in order to meet the requirements.

The main factors affecting bearing vibration

      By the bearing structural design parameters determined by stiffness, flexibility, quality, and damping vibration system constituted under the operating conditions will produce adapt to its mechanical vibrations.
      Manufacturing process of the deviation caused by vibration, the smaller the deviation, vibration is smaller. Surface of the ball roundness, waviness, surface roughness of the bearing part of the most influential factor of vibration, followed by the inner and outer shape of the channel error and surface roughness, cleanliness and again is the bearing lubricant quality.
    Operating conditions, such as installation conditions, speed, direction of the axial load borne by, for money.

High-speed bearings during installation and fit issues to consider when

A high speed bearings fit and clearance according to both the high-speed  bearing requirements, but also according to temperature bearing requirements, so consider the coordination and clearance to take account of the following points:
(1) when the temperature rose to high temperature dimensional change and hardness;
(2) high speed, the centrifugal force caused by the force system change and shape change.

    In short, high-speed, high-temperature conditions, coordination and clearance from the choice of motor bearings should strive to maintain the accuracy and performance.

    In order to ensure the bearing raceway after installation of small deformation, interference fit amount of interference can not get too big, and high speed centrifugal force and high temperature thermal expansion, or offset with the surface normal pressure. Or so with the surface relaxation, so the amount of interference must be considered under the premise of these two factors to be carefully calculated, at room temperature under constant speed and effective amount of interference for high-speed bearings may be invalid.

     In considering the high speed motor bearing clearance only to consider the above factors, but also to consider the axis thermal expansion effects on the bearing clearance, bearing in working condition requires that there is at operating temperature optimum clearance, and this clearance is taken into account, the outer ring ball groove center precise alignment of state formation. As high-speed bearings for lower relative sliding and internal friction, it is best not to use the inner and outer rings relative axial displacement method to adjust the ball bearing clearance.

    In considering the amount of interference with the bearing and clearance, to note that materials at high temperatures becomes soft and easily deformed features, as well as many from the room temperature to high temperature changes cause some permanent deformation possibilities.

    (2) the requirement for host-related parts

    Where high-speed rotary motor bearings bearing system requires precision dynamic balancing shaft and the bearing seat hole installation site should have a higher than normal requirements of dimensional accuracy and geometrical precision, especially for concentricity and retaining shoulder seat hole or journal the vertical, and in consideration of these issues, it must also be noted that the high-speed operation of the bearing elements and high-temperature factor.

Crossed roller bearings isolation block design defects and improvement

Crossed roller bearings known as cross roller bearings, cylindrical roller generally use roller or tapered roller in a single raceway cross mutually arranged between the roller and the roller cage or through isolation block interval, with high rotational accuracy, the larger the capacity, the smaller dimensions and a higher rotational speed and rigidity, with a very wide range of uses.

cross roller bearing design flaws and improve it.

1 inside the bearing arrangement of the roller, two adjacent rollers arranged in cross, all arranged in the same direction roller intersects the centerline axis of the rotary bearing, two rollers arranged in a direction opposite to the axis of intersection of the center line of the bearing slewing relative to the plane of the center roller symmetrical.

2 Isolation of existing designs of the defect blocks according to the current design, two cylindrical grooves spacers axis the axis perpendicular to the radial plane spacers are parallel, and in that the projection plane perpendicular to each other. Manufactured using current design method has the advantage of an isolation block with good versatility. As long as the selection of different roller bearing the same specifications, generally can use the same kind of isolation blocks. Spacers is cylindrical, its axis center line tangent to the circle of rollers. However, two adjacent roller axes A and B blocks are not isolated from the axis perpendicular to the radial plane are parallel.

Prime line roller work surface and isolation block cylindrical groove surface pixel lines are not parallel, but inclined at an angle, causing the contact state is not good, affect the bearing rotation flexibility and precision rotation speed is higher, the effect is also more obvious. Therefore, it is necessary to improve the design of the separators, the separators of the roller axis of the cylindrical grooves parallel to the axis, thereby improving the isolation block the cylindrical roller groove surface. The higher the speed, the more obvious the effect.

Cross roller bearing raceway gears and repair

Commonly used in the manufacture of gears with steel quenched and tempered steel, hardened steel, case hardening steel and nitriding steel. Slightly lower than the strength of forged steel, commonly used in sizes larger gear; poor mechanical properties of gray cast iron can be used for light load of open gear drive; ductile iron can partially replace the steel gears; multi-purpose plastic gear at light load and low noise requirements of the place, with its paired gear generally good thermal conductivity of steel gears. Once the gear wear, how to fix next described in detail.

Crossed roller bearing Gear Repair:

The best way to go is to measure the wear of the ring gear worst damage teeth, the gear module to ensure the same case, by calculating, re-hobbing, negative change of the gear position, the same, the gear unit associated with it The output pinion positive displacement, in order to ensure that the two gears meshing center distance constant, a pair of gears to high displacement. Followed by the corrupted repair worn teeth first with liquid plastic or surfacing and leave allowance, then hobbing to its original size. To ensure that the original transmission parts and spare parts (such as the output pinions, etc.) can be used again, the need to ensure the same gear center distance of tooth repair, using the method of surfacing reprocessing.

Raceway Repair:

Four raceway formed by the diameter of the square cross-section, the diagonal perpendicular to the ground, that is, each raceway by both the overall cross-sectional diameter of the center line of a 45 ° angle, the raceway surface damage is more serious, oval-shaped, with a flange ring and the annular surface dents to the front indicated baselines grinding raceway surface (due to high surface hardness), by measuring the roundness deviation of 3mm, after grinding, measuring hardness, were HRC30 ~ 40, in order to ensure a 45 ° angle, special production model (see figure II) is used to measure angles. Raceway surface-hardening, quenching hardness HRC55 ~ 60. Then again grinding.

Double row deep groove ball bearing wear prevention

Due to wear caused by the amount of material loss referred to wear. This can be by measuring the length, volume, or mass to obtain the change, and accordingly they are called wire wear
Volume, the volume and quality of wear wear.

   Double row deep groove ball bearing mainly refers to installation and adjustment factors, use and maintenance, repair and other maintenance meets the technical requirements. According bearing installation, use, maintenance
Care and maintenance of the technical requirements for the operation of the bearings to withstand load, speed, temperature, vibration, noise and lubrication condition monitoring and inspection, hair
Are abnormal immediately find reasons to adjust it back to normal. Installation conditions are the primary factors that one of the factors bearing is often caused by improper installation
Resulting package bearing between the various parts of the stress state changes, bearing in abnormal state of operation and early life of the inner end of the main factors is the knot
Structural design, manufacturing processes and materials quality double row deep groove ball bearings determine the quality of three major factors.

1 improper use bearings.

Cause: The installation, operation, or improper removal may cause deformation or defect in the cage

Recommendation: Use the appropriate operating, installation and removal tool

(2) inadequate lubrication

Reasons: inadequate or improper lubrication may cause abrasions or serious element of the double row deep groove ball bearing deformation

Recommendation: Improved lubrication system, aptly timed to supplement or replace the lubricant

3 rust and corrosion

Cause: Contact with water may cause water pump bearing element pitting and rusting. Rust after injury double row deep groove ball bearings at work may cause spalling

Recommendation: regularly check seals to ensure good sealing effect, correct storage of imported bearings

4 Current

Cause: The rotation is powered may cause grooves or nicks. Double row deep groove ball bearing is stationary, electrically operated Improper grounding can cause minor burns

Recommendation: In the outside of the bearing parts before welding through proper ground connection to reduce or avoid the current through the bearing

5 External materials

Cause: The abrasive particle contamination and debris intrusion may lead bearings face wear, abrasions and depression

Recommendation: Clear intrusive particles and debris, replace the lubricant, check the sealing system

6. Eccentric

Reason: eccentric, inclined or excessive load may result in geometric stress concentration or flaking

Recommendation: precision machining imported bearing and retaining shoulder

Double row deep groove ball bearings after installation, in order to check for proper installation, operation should be checked. Small machines can be rotated by hand to confirm whether the rotation along
Cheong. Check the project due to nick, indentation caused by dysfunctional, because poor installation, mount the torque generated by poor processing unstable, due Tour
Gap is too small, the installation error, caused by seal friction torque is too large and so on. Without exception, you can begin powering.

For bearing clearance and rolling material issues

Effective clearance or clearance work is called rolling installed in the host after a certain load, up to a certain temperature stable operation mode, scroll
The actual presence of the bearing clearance. Obviously, the effective clearance smaller than the clearance work. The original rolling bearing clearance is complete after installation in front of the machine,
Located in a free state clearance. In fact the original clearance by measuring it is difficult not learned. So that the original clearance clearance inspection is often used instead.

  roll bearings and rolling elements typically use high carbon chromium bearing steel. Most of the bearing steel in the JIS SUJ2. Large bearings SUJ3. SUJ2 of
Chemical composition, in the world, as the imported bearings material has been normalized. For example: With AISL52100 (United States), DIN100Cr6 (Germany),
BS535A99 (UK), etc. are the same kinds of steel.

  Rolling bearing rings and rolling elements, side repeatedly withstand high contact pressure, sliding along one side of the rolling contact. Retainer rings and roll with one side
Moving body on both sides, or one side sliding contact side under tension and compression forces. Therefore, the bearing rings, rolling elements and cage materials, performance,
Main requirements imports bearing rings, rolling material required performance: rolling fatigue strength, high hardness, high wear resistance.

Reasonable installation location slewing soft zone

Manufacturing process due to slewing bearing inevitably produce a soft zone, which requires the use and selection of slewing device user to install its software with a reasonable position to improve bearing life. The general principle is to try to be flexible with position mounted slewing small changes in load and carry the force minimum position.
Usually turn on the device with mounting ring soft pitching rotation perpendicular to the surface projection line location, such as loading, or stacker-reclaimer slewing ring soft tape on the device to be installed perpendicular to the centerline of the cantilever cutting through the center of the rotation , which stands on the center of rotation of the left or right side face of the cantilever 90 degree position.
The mechanical design is usually soft belt at this position does not exist slewing roller bearing device maximum force state. The next ring of soft rotary device with the device according to the installation location of the center of gravity of the situation and to determine the rotation angle range. If the rotation angle is about 100 degrees, the maximum rotation center of gravity of the portion above the front, it is recommended to lower ring mounted on the rear of the soft belt, or 180 degree position. If the rotation center of gravity of the section above the front and rear position change position are equal, you can optionally install the next soft belt loop angular position.

Slewing loss and storage

slewing bearing loss factor mainly refers to the use of installation and adjustment, use and maintenance, repair and other maintenance meets the technical requirements. Installation conditions are the primary factors that one of the factors, slewing ring often due to improper installation of the parts of the entire slewing between the force status changes, slewing ring in the abnormal state of operation and losses. According slewing installation, use, maintenance, maintenance of the technical requirements for operation of the rotary bearing to withstand load, speed, temperature, vibration, noise and lubrication condition monitoring and inspection, abnormal should immediately find reasons to be adjusted to normal. Moreover, the quality of the grease and the surrounding medium, and the atmosphere is also very important for analytical testing.
Slewing oiled at the factory and used film wrapped, the packaging rust generally valid 3-6 months. Their storage temperature should be 20 ± 10 ℃, with relative humidity less than 60%, more than valid, it should be timely maintenance. Slewing inventory should be greased after one year, and check its rotation flexibility.
    Slewing bearing factory generally fixed on pallets or containers, with a single piece packaging and packaging into groups of two forms. Transport and storage should be kept level, not collision and extrusion, not rain, storage should be smooth. Slewing ring should be stacked flat between isolation.
    Slewing lifting holes generally can be screwed into safe lifting eyebolts.

Bearing parts heat treatment Common Pitfalls

Heat treatment of common defects bearing parts Abstract: tightening machinery industry continued decline in corporate profits high speed machining is the development trend of automobile mold manufacturing heavy ball screw recently successfully developed the basis for programming CNC milling machinery industry: technological advances driving the industry's sustained prosperity first imported CNC hobbing machine in Hangzhou high-speed rolling oils selected row angular contact ball bearing and double row angular contact ball bearings in Japan to open up China Machine Tool & Mold strengthen efforts to efficiently market the discussion thread turning what is grinding? laser control breaker developed in Japan new linear drive unit grease terminology heat treatment of steel Talking surfacing welding materials research environmental problems self-lubricating bearings new applications differential transmission Displacement Sensor structure optimization and its digital interface circuit design valve selection, function and The main factors piping system virtual manufacturing technology in manufacturing applications processed tissue surface defects common parts bearing overheating cause stress bearing parts heat quenched microstructure common quality defects overheating quenching cracks stiff enough heat deformable surface decarburization 1. overheated bearing parts coarse quenched microstructure was observed overheating overheating degree must determine exactly GCr quenched microstructures observed tissue acicular martensite microstructure formation may be due to thermal quenching quenching.

Bearing parts after heat treatment of the common quality defects are: hardened microstructure overheating, lack of heat, quenching cracks, hardness is not enough, heat deformation, surface decarburization, soft points.

1 overheat

Port from the bearing part can be observed on the rough microstructure after hardening overheating. But to determine the exact extent of overheating must observe the microstructure. If GCr15 steel hardened tissues appear coarse acicular martensite, was quenched overheating tissue. Formation may be due to the quenching temperature is too high or too long causing heat insulation comprehensive overheating; also may be due to the original organization carbon ribbon severe in the two areas with the formation of carbon between the local martensite needles thick, caused by local overheating. Overheating tissues residual austenite increases, dimension stability decreased. As quenching overheated steel coarse crystals, may cause parts of the decrease in toughness, impact resistance decreased, the bearing life is reduced. Even cause serious overheating quenching cracks.

(2) less heat

Quenching temperature is low or poor cooling in the microstructure produced more than the standard prescribed troostite organization called due to heat tissue, which decrease in hardness, wear resistance drastically reduced, affecting bearing life.

3 quenching cracks

Bearing parts in the quenching process due to the formation of stress cracks called quenching cracks. Cause such cracks reasons: because the quenching temperature is too high or too fast cooling, thermal stress and metal mass volume change when the stress fracture resistance than steel; work surface defects original (such as surface micro-cracks or draw marks) or steel internal defects (such as slag, severe non-metallic inclusions, white point, residual shrinkage, etc.) at a stress concentration quenching; severe surface decarburization and carbide segregation; parts after quenching and tempering insufficient or timely tempering; previous process caused by too much stress cold punching, forging folding, turning deep marks, oil, sharp edges, etc. ditch. In short, resulting in quenching cracks may be due to one or more of these factors, the existence of internal stress cracks forming the main hardening. Quenching cracks deep and slender, straight fracture, fracture surface without oxidation colors. It is often in the bearing rings on the straight longitudinal cracks or ring cracking; ball bearing on the shape of the S-shaped, T-shaped or ring. The organization is characterized by quenching cracks no cracks on both sides of decarburization phenomenon, the obvious difference with forging cracks and material cracks.

4 heat deformation

Bearing parts during heat treatment, the presence of thermal stress and stress, this stress can be superimposed on each other, or partially offset, is complex, because it along with the heating temperature, heating rate, cooling, cooling rate, part shape and the size of the change, so the heat distortion is inevitable. Understand and grasp its variation can make the bearing part of the deformation (such as elliptical rings, rose and large size) placed controllable range, is conducive to the production of conduct. Of course, during the heat treatment the mechanical collision of parts also cause deformation, but this deformation can be used to reduce and improve operations avoided.

5 surface decarburization

Bearing parts in the heat treatment process, if it is heated in an oxidizing medium, the surface oxidation occurs to parts of the surface carbon content reduced, resulting in surface decarburization. Surface decarburization depth over the last machining allowance will make parts scrapped. Determination of surface decarburization depth available in metallographic examination and microhardness metallographic method. In the surface layer microhardness distribution curve measurement prevail, do arbitration criterion.

6 soft spots

Because insufficient heating and cooling is bad, improper operation and other causes hardening of the bearing surface of the part of the phenomenon known locally insufficient hardness quenching soft spots. It is the same as the surface decarburization can cause surface wear resistance and fatigue strength in serious decline.

Raw material roller press bearing damage cause analysis and maintenance recommendations

In the dry process cement production line process, the raw material has been widely used roller press, and has made considerable economic and social benefits, a significant increase of its energy-saving effect is also recognized by the majority of manufacturers to use. But in the course of its use, the bearing life is short, damage and replacement process cycle is long, costly, labor-intensive, but it restricts the normal operation of the rotary kiln.

My company put into operation by the end of 2012 the two 4500t / d clinker production line, run until June 2003, four sets of Chengdu Lijun Industrial Co., Ltd. manufactured CLF180-120 there have been varying degrees of roller presses the problem of high bearing temperatures, 7 mid-May the 2nd roll maneuver near the gear side roller bearing damage. Total running time of 2041 hours, the service life of less than three months.

First, the device pre-operational status

Roller press run early bearing temperature between 50-60 degrees, there is no abnormal noise, bearing grease used by the U.S. Castrol brand Molub-Alloy 777-2 ES model roller presses grease, the amount of fuel in strict accordance with equipment manufacturers Requests the Executive. Five to six months, there have been several cycles of water blockage, resulting in bearing temperature up to 70 degrees. In mid-June, found that the lower part of the inner bearing oil outlet circulating water discharge phenomenon occurs suspected side of the bearing end cap rupture caused by cooling water, then turn off the inside of the circulating water, the new grease replenishing the oil discharged into the roller press production. In early July, roller presses the bearing temperature has been hovering around 55 degrees to 75 degrees, for various reasons during the roller press is always open to open the stop, there have been more than 24 hours continuously feeding situation. July 10 start, roller press repeatedly appear continuous feeding more than four hours on account of the temperature exceeds 75 degrees to stop jumping. July 12 greaser checking the oil discharge roller press discovered the bearing fragments. Determine the bearing roller press has been damaged. Since the roller press has been put into the roll gap deviation, pressure instability. Deviation due to the roll gap gauge, pressure gauge, the width of the roll gap and other factors frequently exceeds the limit mediation, there have been almost no more than 48 hours continuously feeding situation.

Second, the disintegration of the investigation bearing damage

After the demolition of the roller press gearbox bearing cap open and found that there is a rift bearing outside diameter, a broken ball bearings, inner and outer diameter with five out of crack, the bearing inner and outer raceway badly worn bearing retainer wear . Bearing cap surrounded by circulating water cooling on both sides have two brass compression fracture phenomena, round copper tubes are flattened, leading to fracture, width of about 100mm. Check the other side of the roll maneuver roller bearings, intact, the bearing clearance of 0.75mm, within the normal range.

Third, bearing damage cause analysis and improvement

1 First, bearing life is too short not to troubleshoot and manufacturer of quality bearing assembly itself, but should also work with bearing operating conditions in harsh environments and have a great relationship.

2. Bearing thermal design flaws. Such a large bearing operating process will produce a lot of frictional heat, so that both sides of the bearing cap manufacturer designed circulating path, the heat generated by the bearing grease and the case conduction through the cooling copper tube absorbs heat water circulating outflow apparatus body, lower bearing temperatures. But it cooled copper mounting position is unreasonable, bearing swing too easy to squeeze into the brass, brass deformation caused by blockage, fracture, loss of cooling effect. To avoid copper tube is extruded, only increase the gap between the copper and the bearing, to ensure a greater swing bearing free space, which requires manufacturers to redesign, production bearing cap or another design a cooling device.

3 brass water lead to rupture of the rear bearing lubrication failure, it could be this short bearing life is an important factor. Equipment inspection work found during the inspections bearing lower discharge port has water leakage, immediately made a report, but this is not possible in the cooling copper pipe break after the first time discovered. Since the bearing inner brass cap by squeezing fracture, circulating water entering the bearing, destroyed the environment lubrication, the bearing balls and the raceway serious friction generates a lot of heat, bearing balls and the diameter of each component such damage.

4 brass frequent clogging cooling and design too small, poor cooling effect also affect bearing life. Cooled copper diameter is too small, the circulating water and debris clog adhesion brass scale deposition in the roller press often occurs during operation bearing high temperature, inlet and outlet brass examination revealed multiple blockage, affecting the cooling effect, the final installed at the inlet Y-strainer before easing clogging.

5 roller presses the material into the inadequate control of particle size, diameter 200mm super chunk too, long nip large deviations, corrective frequently lead to bearing overload and shorten the service life. Initial production mining crushing, crushing machine safety door is not well controlled, resulting in more than 150mm above the individual particle size of limestone blocks into the next process, clogging the feed opening roller press, leading to uneven feeding, causing the roll gap large deviations, and even lead roll sewing too large equipment mediation. Granularity than 100mm rigid material frequently enters roller presses, roller presses squeeze in an instant when all the large reaction force bearing on the bearing itself, the life of the bearing caused a fundamental impact. Improved granularity of limestone, sandstone and clay crusher materials and faulty phase continued up to more than two months, no broken, large water through the bypass feed materials into the roller press feeding system, more than 250mm above the chunk size is almost Each class appears stuck roll gap, resulting in the roll gap width gauge mediation. This is the roller press operation there have been no more than six months more than 48 hours continuously feeding the root cause.

6 There is no steady flow positions periodically removed materials, excluding enrichment metal, so that the device frequently overloaded mediation affect bearing life. Material into the roller press is impossible to avoid the presence of metal objects and accumulation roller presses the original width of the roll gap of about 20mm, 70mm roll gap will exceed the overload relief, less than 50mm metal objects will only increase the roll surface wear, greater than 50mm size metal objects or materials into the roller press is too large, it will cause the rollers instantly generate excessive impact force, resulting in the roll gap than 70mm, the pressure exceeds 15MPa, exceeds the bearing load limits, the control system will suddenly roller press release pressure or mediation. Especially metal roller presses will cycle loop in the roller press greatest harm. So they requested that must be periodically clearing, clearing accumulated in the roller press metal objects within the system, reduce or avoid damage to equipment, particularly bearing.

7 hidden when the hydraulic system is now hidden, long-term bias is serious roll gap. As the hydraulic system problems, often lower than the pressure roller presses the side of the working pressure, both sides of the roll gap large deviation hydraulic pump long-term frequent correction, resulting in roller presses the bearing operating conditions poor, heavy load, the service life is reduced.

Fourth, the late running Precautions

Roller press bearing life is short, equipment failure rate is the current cement industry a common problem, through analysis of the above reasons, the production process management is a top priority, as long as control the granularity of the material into the roller press, regularly scheduled clearance, reducing metal roller presses against the probability of overload damage to the bearings, excluding hydraulic system problems, eliminating the long-term bias roll gap phenomenon, problem solving partial cutting, take care of the bearing uniform force. As long as the above points, improving the operating environment of the equipment, the equipment can operate normally, to extend the life of each part, in order to improve the operation rate.