Bearing is in the process of mechanical transmission from fixed and reduce the load friction coefficient of parts.Its main function is to support the mechanical rotating body to reduce the friction coefficient of mechanical load in the process of transmission.According to the different tribological properties of moving components, bearings can be divided into rolling bearings and sliding bearings.

Most bearings in order to ensure the smooth and reliable work of bearings, most of them add lubricating oil for lubrication, the purpose is to reduce the internal friction and wear of bearings, prevent burning and sticking: prolong the fatigue life of bearings;Expulsion of frictional heat or heat from an external source;At the same time, the oil film also has a certain capacity of vibration absorption.Add the lubricating oil, however, one of the biggest disadvantage is need good sealing performance, otherwise it will leak, and some have special requirements equipment lubricating oil leakage is not permitted, so people with other lubrication material to replace the lubricating oil, the invention bearing without oil, make it not only possesses the advantages of containing oil bearing, at the same time to eliminate the environmental pollution caused by leakage.

The basic requirements of NACHI bearings for materials depend to a large extent on the working performance of bearings.Whether the materials used to manufacture rolling bearings are suitable or not will have a great impact on their service performance and life.In general, the main damage forms of rolling bearings are fatigue spalling under the action of alternating stress, and the loss of bearing accuracy due to friction and wear.In addition, there are cracks, indentation, rust and other reasons for the abnormal damage of bearings.Therefore, rolling bearings should have high plastic deformation resistance, less friction and wear, good rotation accuracy, good dimensional accuracy and stability, as well as long contact fatigue life.And many of these properties are determined by the material and the heat treatment process.