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Rolling bearing comprises a rolling bearing parts of timber and cage, rivets and other auxiliary materials. The vast majority of rolling bearings and parts made of steel, the rolling bearing steel is usually carbon steel and high carbon chromium steel. With the development of modern science and technology and the use of the increasing amount of rolling bearing, bearing on the increasingly high demand, such as high precision, long life and high reliability etc.. For some special purpose bearings, also asked the bearing material has the advantages of high temperature resistance, corrosion resistance, non magnetism, ultra low temperature performance, anti radiation etc.. In addition, bearing materials include alloy materials, nonferrous metal and non-metal materials etc.. In addition, made of ceramic material bearing has been applied in locomotive, automobile, subway, aviation, aerospace, chemical industry etc..
The working performance of rolling the basic requirements for materials bearing depends largely on the bearing. Selection of manufacturing is appropriate rolling bearing materials, will have great influence on its performance and lifetime. Under normal circumstances, the main failure forms of rolling bearing fatigue spalling force is to be subjected to alternating, and due to the friction and wear loss of precision bearings. In addition, there are cracks, indentation, rust and other causes of bearing abnormal damage. Therefore, the rolling bearing should have high resistance to plastic deformation, friction and wear less, rotation accuracy, good dimensional accuracy and stability, and the length of contact fatigue life. And many of the performance is decided by the materials and heat treatment process. The basic requirements of the rolling bearing is decided by the failure forms of bearing, a certain heat treatment so the requirements of material after rolling bearing manufacturing process and then should have the following properties:
Contact fatigue strength of a high
Contact fatigue failure is the main failure form of the normal bearing. Rolling bearing operation, the rolling body in the bearing, the outer ring raceway rolling, the contact part is subjected to periodic alternating load, more per minute up to hundreds of thousands of times, repeated the role in the periodic alternating stress, fatigue spalling appear contact surface. Rolling bearing began to appear after spalling will cause the bearing vibration, noise increasing working temperature rises rapidly, resulting in the final failure forms of bearing damage, the damage is called contact fatigue. Therefore, the requirements for rolling bearing steel should have the contact fatigue strength of high.