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.
2013年9月14日星期六
2013年9月12日星期四
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 .
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 .
2013年8月24日星期六
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.
(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.
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.
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