Bearing steel fatigue and wear resistance
Rolling bearing parts timber, including timber and maintaining the planes, rivet, and other supporting materials. Rolling the vast majority of their components are made from steel, high carbon chromium bearing steel is usually steel and case-hardened steel. With modern science and technology and the increasing use of rolling bearings, the bearings have become increasingly demanding, such as high-precision, long life and high reliability. For some special-purpose bearings, also called bearing material with high temperature, corrosion-resistant, non-magnetic, ultra-low temperature, anti-radiation properties. In addition, bearing materials, including alloys, nonferrous metals and non-metallic materials. In addition, the
Ceramic materials have been used in locomotive bearings, automobile, subway, aviation, aerospace, chemical and other fields.
Rolling the basic requirements of the material depends largely on the work of bearing performance. Choose manufacture of materials bearing the suitability of their use performance and life expectancy will have a significant impact. Under normal circumstances, the main bearing failure modes are under the action of alternating stress fatigue spalling, as a result of loss of friction and wear Ershi precision bearings. In addition, there are cracks, indentation, corrosion and other causes of irregular bearing damage. Therefore, the bearing should have high resistance to plastic deformation capacity, less friction and wear, good rotation accuracy, good dimensional accuracy and stability, and long-contact fatigue life.
And many of them by the material and performance are jointly determined by the heat treatment process. As the basic requirement for rolling the material damage by bearing the form of the decision, therefore, require manufacturers of material bearing upon after a certain heat treatment processes have the following properties:
Contact fatigue damage is the main form of bearing the normal damage. Rolling operation, the rolling bodies in the bearing, the outer ring raceway between the rolling, the contact part cycle of sexual intercourse to withstand variable loads, multi-person up to hundreds of thousands of times per minute, changing the stress in the cycle of repeated sexual intercourse under the influence of contact surface spalling fatigue. Began to peel off after rolling will give rise to bearing vibration, noise, a sharp rise in operating temperature increases, resulting in the ultimate bearing damage, failure modes such as contact fatigue damage. Therefore, the requirement of steel should have a high rolling contact fatigue.
Rolling normal working hours, in addition to rolling friction occurs, but also accompanied by sliding friction. The main parts of sliding friction occurs are: rolling body and raceway contact area between the rolling body and cage pocket contact surface between the holes, to guide rib cage and the ring and between the roller end face and ferrule guide between the ribs and so on. Rolling in the presence of sliding friction bearing parts inevitably produces wear and tear. If the poor wear resistance of bearing steel, roller bearing will wear prematurely due to loss of precision or accuracy because rotation fell, mainly because bearing vibration increased, reduced life. Therefore, the required bearing steel should have a high wear resistance.
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