1 contact fatigue failure
Contact fatigue failure means the bearing surface by alternating the role of stress arising from failure. Contact fatigue spelling occurred in the bearing surface, often accompanied by fatigue crack, the first from the contact surface the following maximum alternating shear stress generated at, and then extended to the surface of different peeling shapes, such as point-like as pitting or pitting spelling, peel into small pieces is called shallow spelling. As the peeling surface gradually expanded, and often extend to the deep, the formation of deep peeling. Deep contact fatigue spelling is the source of fatigue failure.
2 wear failures
Wear failure refers to the relative surface sliding friction between the working surfaces of the metal lead to constant wear and tear resulting from the failure. Continuing the gradual wear and tear will cause damage to the bearing parts, and eventually lead to loss of dimensional precision bearings and other related issues. Wear may affect the shape change, with the gap increasing and work surface morphology, or it may affect the lubricant contamination to a certain extent complete loss of function caused by lubrication, thereby bearing the loss of rotational accuracy and even can not operate normally. Wear all kinds of bearing failure is a common failure mode, one can generally be divided according to wear the most common form of abrasive wear and adhesive wear.
Abrasive wear means the bearings between the bearing surface to squeeze into the external hard particles or hard foreign bodies or metal surfaces and wear debris caused by relative movement of the contact surface wear and tear, often resulting in the bearing surface furrow-like abrasions. Hard particles or foreign matter may come from within the host or other adjoining parts from the host system, sent by the media inside the bearing lubrication. Adhesive wear refers to the microscopic friction surface bumps or uneven force foreign to the friction surface, a serious deterioration in the lubrication conditions, due to local friction and heat, could easily lead to local deformation and the friction surface microstructure of friction welding phenomenon, serious partial melting at the surface of the metal may be, will force the local friction contact surface weld torn from the matrix on the plastic deformation increases. This adhesion - tear - adhesive composition of the adhesive wear cycle, in general, slight adhesive wear is called abrasion, severe adhesive wear is called occlusion.
3 breaks Failure
Bearing Failure is mainly due to defects and overload is two major factors. When the applied load exceeds the ultimate strength of materials, parts break as a result of overload fracture. The main reason is the hosts overload sudden failure or improper installation. Bearing parts of the micro-cracks, shrinkage, air bubbles, large foreign debris, overheating and partial burns and other tissue defects in severe shock or vibration overload will cause fracture in the defects, called flaws fracture. It should be noted, bearing in the manufacturing process, raw materials into the plant for re-inspection, forging and heat treatment quality control, process control equipment can be properly analyzed by the existence of these defects; the control must be strengthened in the future. But in general, usually bearing fracture failure occurs most of overload failure.
4 failure of clearance changes
Bearing in work, due to external or internal factors, with the gap so that the original change, lower accuracy, and even lead to "bite" as changes in clearance failure. External factors such as excessive interference, the installation is not in place, the amount of expansion due to temperature, instantaneous overload, internal factors such as residual austenite and residual stress in a precarious state and so is the change in clearance caused by failure of the main reasons.
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