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
2013年10月16日星期三
2013年9月27日星期五
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.
2013年9月6日星期五
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.
2013年9月5日星期四
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.
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.
2013年8月20日星期二
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.
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.
2013年8月10日星期六
High-speed precision angular contact ball bearing installation
High-speed precision angular contact ball bearing, mainly used for high-speed rotating occasions lighter loads, requiring high precision bearings, high speed, low vibration and low temperature rise a certain life. Often high-speed spindle support member installed in pairs, is the inner surface grinding spindle speed key component parts.
High-speed precision angular contact ball bearing service life of a great relationship with the installation, you should note the following:
1 bearing installation should be clean, clean room for the bearing to be carefully matching, bearing spacers to go through the grind of maintaining high inner and outer ring spacers under the premise of the spacer should be controlled in parallel 1um the following;
(2) Before installing the bearings should be cleaned, cleaning the inner slope upward, feel should be flexible, no sense of stagnation, dried, placed in a predetermined amount grease, oil mist lubrication should be placed in the case of a small amount of oil mist;
3 bearing installation tool should be used exclusively, even by force, is strictly prohibited beat;
4 bearing deposit should be clean and ventilated, non-corrosive gases, relative humidity less than 65%, long-term storage should be periodically rust.
High-speed precision angular contact ball bearing service life of a great relationship with the installation, you should note the following:
1 bearing installation should be clean, clean room for the bearing to be carefully matching, bearing spacers to go through the grind of maintaining high inner and outer ring spacers under the premise of the spacer should be controlled in parallel 1um the following;
(2) Before installing the bearings should be cleaned, cleaning the inner slope upward, feel should be flexible, no sense of stagnation, dried, placed in a predetermined amount grease, oil mist lubrication should be placed in the case of a small amount of oil mist;
3 bearing installation tool should be used exclusively, even by force, is strictly prohibited beat;
4 bearing deposit should be clean and ventilated, non-corrosive gases, relative humidity less than 65%, long-term storage should be periodically rust.
Angular contact ball bearings operating instructions
1, the operating instructions for the preparation of: according to equipment for the preparation of items that can be processed, which includes operations job preparation and job steps, process characteristics control requirements (processing device parameters, such as grinding diameter, the workpiece and wheel speed , sand turn trimming frequency, slim bearing, eccentricity, etc.; channel coarse and fine, overtime, workpiece speed, beat frequency and angle Whetstone, Whetstone pressure and ultra-precision time and other parameters; tooling adjustment norms, etc.), product characteristics control requirements (process control projects, testing tools, etc.), the main products project failed rework operations guidance.
2, the product process control plan preparation: There are general and specific product model two kinds. Sequential arrangement by a process flow diagram of the process carried out, work number is consistent, some processes can be combined, but the need for notes, such as demagnetization cleaning. Characteristics projects and processes should be the same size cards, it is important also need to specify the process characteristics, such as grinding channel, the wheel speed, workpiece speed, light grinding time, dresser, etc., generally have the book provides guidance on the job, you can indicate references . There are specific types of product specification shall control the planning process and grind super size card processing agreement. Also the measurement technology, measurement sampling samples, control methods and error proofing, response plans and corrective measures, according to the actual production can do and control and to ensure quality content preparation, because of the part of the production control plan requirements must be process control.
3, the product of the preparation process failure modes: first by a process flow diagram and the process of risk assessment, was named high-risk failure analysis to be done.
There are general and specific product model two kinds. Sequential arrangement by a process flow diagram of the process carried out, work number consistent. Included were rated high risk of failure processes may require the presence of all, the possible consequences, which may be the reason of being a means of control methods, and the possibility of them out, and whether measures need to be taken and so on.
Such as grinding end faces potential failure modes and failure reasons: ① width size is too large or too small, mainly related to the grinding time
And stress-related; ② parallelism tolerance, when using the vertical shaft surface grinding machine, its failure causes the wheel spindle is not perpendicular to the magnetic table, magnetic units surface wear, magnetic units magnetic enough, grinding work, "slip", magnetic units surface dirty, dirty work or face burr, magnetic rotary precision is not high, when using double end grinder, the two parallel grinding wheel face is not good, two wheel face serious wear and tear, improper installation exit guide plate, grinding I such as excessive; ③ flatness tolerance, when using the vertical shaft surface grinding machine, its failure causes a workpiece is too thin, heat deformation, wheel too hard, cutting fluid supply, etc., when using the double end grinder, the main export at the guide plate is not properly installed and so on.
Grinding diameter when the potential failure modes and failure reasons: ① aperture is too large, the bearing surface size tolerance, was grinding the workpiece aperture to remain excessive, over automatic feed stroke, etc.; ② tolerance ellipse, oval workpiece support surface too large, reflected in the mill complex on the surface of the workpiece support surface with card injury; ③ cylindricity tolerance, the workpiece spindle axis and the wheel axis is not parallel to the centerline, wheel dressing well, wheel width too wide, vertical reciprocating distance is too short, rough cylinder through the large, rough diameter stay excessive infeed is too fast, too short a time without feeding, wheel too soft; ④ holes face is not perpendicular magnetic clamps enough support position not equal.
2, the product process control plan preparation: There are general and specific product model two kinds. Sequential arrangement by a process flow diagram of the process carried out, work number is consistent, some processes can be combined, but the need for notes, such as demagnetization cleaning. Characteristics projects and processes should be the same size cards, it is important also need to specify the process characteristics, such as grinding channel, the wheel speed, workpiece speed, light grinding time, dresser, etc., generally have the book provides guidance on the job, you can indicate references . There are specific types of product specification shall control the planning process and grind super size card processing agreement. Also the measurement technology, measurement sampling samples, control methods and error proofing, response plans and corrective measures, according to the actual production can do and control and to ensure quality content preparation, because of the part of the production control plan requirements must be process control.
3, the product of the preparation process failure modes: first by a process flow diagram and the process of risk assessment, was named high-risk failure analysis to be done.
There are general and specific product model two kinds. Sequential arrangement by a process flow diagram of the process carried out, work number consistent. Included were rated high risk of failure processes may require the presence of all, the possible consequences, which may be the reason of being a means of control methods, and the possibility of them out, and whether measures need to be taken and so on.
Such as grinding end faces potential failure modes and failure reasons: ① width size is too large or too small, mainly related to the grinding time
And stress-related; ② parallelism tolerance, when using the vertical shaft surface grinding machine, its failure causes the wheel spindle is not perpendicular to the magnetic table, magnetic units surface wear, magnetic units magnetic enough, grinding work, "slip", magnetic units surface dirty, dirty work or face burr, magnetic rotary precision is not high, when using double end grinder, the two parallel grinding wheel face is not good, two wheel face serious wear and tear, improper installation exit guide plate, grinding I such as excessive; ③ flatness tolerance, when using the vertical shaft surface grinding machine, its failure causes a workpiece is too thin, heat deformation, wheel too hard, cutting fluid supply, etc., when using the double end grinder, the main export at the guide plate is not properly installed and so on.
Grinding diameter when the potential failure modes and failure reasons: ① aperture is too large, the bearing surface size tolerance, was grinding the workpiece aperture to remain excessive, over automatic feed stroke, etc.; ② tolerance ellipse, oval workpiece support surface too large, reflected in the mill complex on the surface of the workpiece support surface with card injury; ③ cylindricity tolerance, the workpiece spindle axis and the wheel axis is not parallel to the centerline, wheel dressing well, wheel width too wide, vertical reciprocating distance is too short, rough cylinder through the large, rough diameter stay excessive infeed is too fast, too short a time without feeding, wheel too soft; ④ holes face is not perpendicular magnetic clamps enough support position not equal.
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