TIMKEN bearing contact fatigue failure is the failure of the working surface of the bearing due to the alternating stress, and deep spalling is the intrinsic cause of contact fatigue failure.
We know that contact fatigue spalling occurs on the working surface of deep groove ball bearings, often accompanied by fatigue cracks, first generated from the maximum alternating shear stress below the contact surface, and then extended to the surface to form different spalling shapes, such as dots. Peeling or pitting, peeling off into small pieces called shallow peeling. Due to the gradual enlargement of the exfoliation surface, it tends to expand deeper and form deep exfoliation.
Wear failure refers to the failure of the relative sliding friction between the surfaces resulting in the continuous wear of the metal on the working surface.
Continued wear and tear will cause gradual damage to the bearing components and ultimately lead to loss of bearing dimensional accuracy and other related problems. Wear may affect the shape change. The increase of the clearance and the change of the surface of the working surface may affect the lubricant or cause the pollution to a certain extent, resulting in complete loss of the lubrication function, thus causing the bearing to lose the rotation precision or even the normal operation. Wear failure is one of the common failure modes of various types of bearings. It is usually classified into the most common abrasive wear and adhesive wear according to the form of wear.
The main cause of TIMKEN bearing fracture failure is the defect of TIMKEN bearing itself and the overload during use.
When the applied load exceeds the material strength limit and the part is broken, it is called overload fracture. The main reason for the overload is the sudden failure of the host or improper installation. Defects such as microcracks, shrinkage cavities, air bubbles, large foreign objects, overheated tissue and localized burns of the bearing parts also cause breakage at the defects during impact overload or severe vibration, called defect fracture. It should be pointed out that in the manufacturing process, in the process of re-inspection of raw materials, quality control of forging and heat treatment, and process control, the above defects can be correctly analyzed by instruments, and control must be strengthened in the future. However, in general, most of the deep groove ball bearing fracture failures are overload failure.
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