Three Major Factors For NSK Bearing Failure

1 Contact fatigue failure
Contact fatigue failure refers to failure caused by the alternating stress on the working surface of NSK bearings. Contact fatigue spalling occurs on the working surface of sliding bearings, and is often accompanied by fatigue cracks. It first occurs from the maximum alternating shear stress below the contact surface, and then expands to the surface to form different spalling shapes, such as pitting or pitting spalling. , peeling off into small flakes is called shallow peeling. Due to the gradual expansion of the peeling surface, it often extends to deep layers, forming deep peeling. Deep spalling is a fatigue source of contact fatigue failure.
2 Failure of clearance change
During the operation of NSK bearings, due to the influence of external or internal factors, the original fitting clearance changes, the accuracy decreases, and even “seizing” is called clearance change failure. External factors such as excessive interference, improper installation, expansion caused by temperature rise, instantaneous overload, etc., and internal factors such as retained austenite and residual stress in an unstable state are the main reasons for clearance change failure.
3 Wear failure
Wear failure refers to the failure caused by the relative sliding friction between surfaces causing continuous wear of the metal on the working surface. Continuous wear will cause gradual damage to bearing parts, and eventually lead to loss of dimensional accuracy of sliding bearings and other related problems. Wear may affect shape changes, increase the fitting clearance, and change the topography of the working surface. It may affect the lubricant or contaminate it to a certain extent, causing the lubrication function to be completely lost, thus causing the bearing to lose rotational accuracy or even fail to operate normally. Wear failure is one of the common failure modes of various types of bearings. According to the wear form, it can usually be divided into the most common abrasive wear and adhesive wear.
First of all, only if the structural design is reasonable and advanced, the bearing life will be longer. The manufacturing of NSK bearings generally requires multiple processing procedures such as forging, heat treatment, turning, grinding and assembly. The rationality, advancement and stability of each processing technology will also affect the life of the bearing. Among them, the heat treatment and grinding processes that affect the quality of finished bearings are often more directly related to bearing failure. Bearing Research on the metamorphic layer on the working surface of bearings in recent years has shown that the grinding process is closely related to the surface quality of the bearing.