1. exposure fatigue failure
Failure means the bearing surface of contact fatigue results from alternating stress the role of failures. Contact fatigue spalling in bearing surface, often accompanied by fatigue cracks, contact surface the following maximum alternating shear stress in the first place, and extending to the surface to form a variety of Flake shapes, such as point-like pitting corrosion or pitting flaking, spalling of shallow Flake into small flakes. Due to flaking surfaces gradually expanded, and often expand into the deep, forming deep peeling. Deep contact fatigue failure fatigue spalling is the source.
2. wear failure
Wear failure means relative to the surface of sliding friction causes it to work constantly wear and failure of the metallization. Continued gradual damage bearing parts caused by wear, and eventually led to the loss of precision of bearing size and other related issues. Wear may affect the shape change, clearance increased and morphological changes on the surface, might affect the lubricants or it reaches a certain degree of contamination caused by the complete loss of lubrication function, thus loss of running accuracy of the bearing and does not operate properly. Wear failure is one of the common failure modes of all kinds of bearings, classified according to the wear is usually in the form of the most common abrasive and adhesive wear of wear.
Abrasive wear of means between the bearing surfaces into external hard particles or hard foreign objects or debris on the surface of metal and contact surface wear and tear resulting from the relative movement, often cause furrows in the bearing working surface scrapes. Hard particles or foreign objects may come from within the host or from other neighboring parts of the host system by internal lubricants into bearing. Adhesive wear due to friction Ridge on the surface of micro-friction force or foreign bodies do not, serious deterioration in lubrication, friction and heat due to local, prone to friction phenomena of local deformation of surface micro-welding and friction, surface may be serious partial melting, local frictional contact surface force on plastic deformation of solder tearing from the substrate and increased. This adhesion – tear – cycle form the adhesive wear of adhesion, in General, slightly adhesive wear is called scratch, serious adhesive wear is called occlusion.
3. fracture
Bearing failure due to defects and overload two major factors. When plus loads more than material fracture strength limit resulting parts called overload fracture. Overload is mainly hosts sudden failure or improper installation. Bearing parts micro-cracks, shrinkage, bubbles, large foreign bodies, organizations and local overheating burn defects in shock overload or violent vibration also caused by defect in fracture, fracture called defects. It should be noted that bearings in the manufacturing process, raw materials into the plant complex, forging and heat treatment quality control inspection, process control instrument the correct analysis of the flaws are there, still controls must be strengthened in the future. In General, however, often appears on the majority of those bearing failure overload failure.
4. clearance change failure
Bearing in work, due to the effects of the external or internal factors, so that the original clearance changes, loss of precision, even causing "killed" called clearance change failure. External factors such as the degree of interference is too large, the installation is not in place, and expansion due to temperature, instantaneous overload etc, intrinsic factors, such as the residual austenite and residual stress in an unstable state clearance changes caused by those are major causes of failure.
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