Characteristics and forming conditions of deep groove ball bearing crack: it usually occurs in parts, raw materials, carbon belts and longitudinal extension, with serious or excluded segregation, cracks from surface to inside, deep cracks and long hardenability.

Solutions and precautions: remove carbon tape and paper towels, isolate raw materials, and do not contain excessive impurities; Reasonable formulation of heat treatment parameters shall be influenced by human actions as far as possible.

Characteristics and formation conditions of quenching cracks: they do not usually occur in the quenched and carburized parts or components, and the cracks are located at the gaps between the parts and the thickness of the air tip.

Solutions and preventive measures: the key is to formulate reasonable heat treatment process parameters, improve the skills of operators and try to eliminate human factors; Curved transitions of design are best used to avoid sharp corners.

Characteristics and conditions of quenching crack formation: grinding crack is easy to form on the surface.

Solutions and precautions for high hardness of parts: sufficient heat treatment and tempering; Small grinding feed speed reduces the heat generated during grinding.

Bearing damage: Generally, if the deep groove ball bearing is properly used, it can be used until reaching the fatigue life. However, accidental and premature damage may occur making it difficult to use. In contrast to fatigue life, this early damage is the limit of quality use and is referred to as a failure or accident. This is usually due to negligence during installation, use, and lubrication, foreign material ingress from the outside, and insufficient study of the thermal effects of the shaft and casing.