1. Friction compatibility The performance of the shaft diameter in direct contact with the shaft tile to prevent adhesion and the formation of boundary lubrication.

The material factors that affect the friction compatibility of the friction pair are:

(1) into the sub-material metallurgy into the degree of difficulty in the composition of the alloy.

(2) material and lubricant affinity.

(3) The friction factor of the material in the unlubricated state.

(4) The microstructure of the material.

(5) The thermal conductivity of the material.

(6) The size of the surface energy of the material and the properties of the oxide film.

2. Clamp-in properties The ability of a material to allow a lubricant to clamp in on hard particles from outside and prevent scratching or abrasion. For metal materials, low hardness and low modulus of elasticity, clamp into the good, and non-metallic materials are not necessarily, for example, carbon graphite, modulus of elasticity is low, but clamp into the bad. Spherical roller bearings usually use softer materials and harder materials constitute the friction amplitude, generally use softer materials to do shaft tile.

3. Wearability In the shaft diameter and shaft tile grinding process, reduce the shaft diameter and shaft tile processing error, coaxiality error, surface roughness parameter value, so that the contact uniformity, thus reducing the friction, the ability to wear rate.

4. Friction compliance The material relies on the surface of the elastic-plastic deformation to compensate for poor initial fit and shaft deflection properties of the sliding friction surface. Materials with low modulus of elasticity have better compliance.

5. Wear resistance The ability of a sub-material to resist wear. Under the specified wear conditions, the wear resistance is expressed in terms of the wear rate or wear degree, the reciprocal of the wear volume.

6. Fatigue resistance The ability of a material to resist fatigue damage under cyclic loading. At operating temperature, the strength, hardness, impact strength and organisational uniformity of the shaft material are very important against fatigue. Abrasion, clamp-in good material, usually poor fatigue resistance.

7. Corrosion resistance The ability of a material to resist corrosion. Lubricating oil in the atmosphere will gradually oxidation, produce acid, and in most lubricants also contain extreme pressure additives, they will corrode FAG bearing materials, therefore, spherical roller bearing materials need to