Bearing failure classification knowledge

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The imported bearing failure Category:

Contact fatigue failure

Contact fatigue failure means the bearing surface by alternating stress failure. Contact fatigue spalling occurred in the bearing surface, often accompanied by fatigue crack, the maximum alternat ing shear stress at first from below the surface of the contact, and then extended to the surface of the peeling shape, such as punctate pitting, peeling or pitting, said shallow flaking flaking into small pieces. Due to the gradual expansion of the surface spalling, and often extended to the deep, the formation of deep peeling. The deep peel off contact fatigue failure fatigue source.bearing suppliers

(2) Wear Failure

The relative sliding friction between the surface of wear failure refers to failure to cause the metal work surface wear. Wear will cause the bearing parts gradual deterioration and eventually lead to the loss of dimensional precision bearings and other related issues. Wear may affect the change in shape, with the gap increasing and work surface morphology of lubricant is likely to affect its pollution to a certain extent, caused by the complete loss of lubricating function , and thus the loss of bearing rotation accuracy and even can not operate normally. The Wear Failure is all kinds of bearings common failure modes, the most common form of wear is usually divided into abrasive wear and adhesive wear.

Abrasive wear of the bearing between the bearing surface debris and contacts the surface of the to squeeze inward hard particles or hard foreign matter or a metal surface wear caused by relative movement in the bearing surface, often referred to imports cause abrasions of the furrow-shaped. Hard particles or foreign objects inside the bearing may come from within the host or from the host system adjacent parts sent by the lubricating medium. Adhesive wear means microscopic bumps or foreign body due to the friction surface of the friction surface uneven force, the serious deterioration of the lubrication conditions, due to local friction and heat, could easily lead to local deformation and friction of the friction surface micro-welding phenomenon, serious when the surface of the metal may be partially melted, the biasing force of the contact surface of the the local friction welding point from the substrate tear while increasing the plastic deformation. This adhesive - tear - adhesion cycle constitutes adhesive wear, general, mild adhesive wear called abrasions, severe adhesive wear is called bite.

3 fracture failure

Imported bearings fracture failure was mainly due to two factors defects and overload. When the applied load exceeds the limit of the strength of the material and cause the parts breakage called the overload fracture. Overload is due to host the sudden failure or improper installation. Bearing parts of the micro-cracks, shrinkage, bubbles, large piece of foreign debris, overheating organizations and local burns and other defects will impact overload or excessive vibration caused by the defect at the fracture, fracture called defective. It should be noted that the bearing during the manufacturing process, the raw material into the plant reinspection, forging and heat treatment quality control, process control can be correctly analyzed by the instrument above defects exists, will still need to strengthen the control. But in general, usually bearing fracture failure most of overload failure.thin section ball bearing

4 clearance change failure

Imported bearings at work, due to external or internal factors, so that the original with the gap change, reduced accuracy, and even cause "killed" is called the clearance change failure. External factors such as interference is too high, the installation is not in place, the temperature rise due to expansion, instantaneous overload, internal factors such as residual austenite and residual stress in an unstable state and so is the main cause of changes in the clearance failure.