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Classification of the fundamental shape of bearing failure

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1. Sticking to the grinding mill is one of the most common failure modes of various bearing appearances. The relative sliding conflict between bearing parts causes the loss of its appearance metal to be called sliding wear. Continued wear will change the size and shape of the parts; The bearing cooperation gap is increased; the external appearance of the operation is deteriorated; then the rotation accuracy is lost; the bearing can not work normally. The sliding wear mode can be divided into abrasive wear, adhesive wear, corrosion wear, fretting wear, etc. The most common Abrasive wear and adhesion wear.
The appearance of the collision surface between the conflicting faces of the bearing parts caused by the external hard metal grinding results in the wear of the abrasive surface. It often forms a chiseled or furched type of abrasion on the outer surface of the bearing. The external hard particles often come from the air. The impurities in the dust smoothing agent. Adhesive wear is mainly because the generalized peak of the conflict appearance makes the conflict surface unevenly affected; part of the conflict heat makes the conflict surface temperature rise; the smooth oil film breaks; the outer surface metal will be part when severe Dissolving; the process of the cycle of sticking, avulsion, and re-adhesion at the touch point; the welding and jamming of the conflicting faces in severe cases.
2. Touch fatigue (tired wear) failure Touch fatigue failure is one of the most common failure modes of various types of bearings; it is the failure of the bearing surface to be repeated by the cyclical contact stress. The wear of the bearing parts is a fatigue crack. The process of germination and expansion to cracks. The initial touch fatigue crack first occurs from the maximum orthogonal shear stress below the touch surface; then it expands to the outer surface to form a punctiform or small piece of peeling; the former is called pitting or pitting Shedding, the latter is called shallow shedding. For example, the initial crack occurs in the hardened layer and the core area; the early shedding of the hardened layer is called the hardened layer shedding.

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