Generally speaking, the rolling surface in a moderate compressive stress, but also combined with the surface stress rate from grinding to super finishing process parameters in order to determine the most conducive to bearing fatigue life, in this regard, should be made bearing the professionals with in order to be resolved.

Metamorphic layer of the rolling surface of the oxidation layer, hardening layer and the organization of distortion layer in the physical and chemical properties of base metal surface layer, and their own strength is often very poor with the substrate is not strong on the bearings pain fatigue life and wear life are extremely unfavorable, should be uncontrolled.

For high-precision bearings, rolling surface roughness required is smaller if the process means inappropriate, this smooth surface is not formed by the cutting, but the abrasive squeeze rub role, the surface must by plastic flow the formation of the metamorphic layer, in fact, the bearing life is also very unfavorable, should be controlled.