The characteristics and formation conditions of cracks in deep groove ball bearings: often occur in components, raw materials, carbon strips, and longitudinal extensions with severe or non included structural segregation, cracks from the surface inward, deep cracks, and long hardenability.

Solution and preventive measures: Eliminate carbon ribbon and tissue, isolate raw materials without excessive impurities; The reasonable development of heat treatment parameters should take into account human actions as much as possible.

The characteristics and formation conditions of quenching cracks: They do not often occur in quenched carburized parts or components, and cracks are located at the gap between the part and the thickness at the critical point.

Solution and preventive measures: The key is to develop a reasonable heat treatment process parameter to improve the skills of operators and attempt to eliminate human operational factors; The optimal use of curved transitions in design to avoid sharp corners.

The characteristics and conditions for forming quenching cracks: It is easy to produce such grinding cracks on the surface.

Solution and preventive measures for high hardness of parts: sufficient heat treatment for tempering; The grinding feed rate is small, reducing the heat generated during grinding.

Bearing damage: Generally, if deep groove ball bearings are used correctly, they can be used until the fatigue life is reached. But there may be unexpected premature damage and inability to withstand use. This early damage, as opposed to fatigue life, is the limit of quality use known as failure or accident. Mostly due to careless installation, use, and lubrication, foreign objects invading from the outside, and insufficient research on the thermal effects on the shaft and housing