For NTN Bearing failure classification problem

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NTN bearings in the running for some time, it is necessary to check whether the problem, especially to see if the failure. Today I ll tell you that NTN bearing failure classification.
1. Contact fatigue failure
Contact fatigue f ailure means the the NTN bearings work surface by alternating stress failure. Contact fatigue spalling occurred in NTN bearings work surface, often accompanied by fatigue crack, starting with the maximum alternating shear stress at the contact surfaces of the following, and then extended to the surface to form a different shape of spalling, such as point-like pitting or pitting and spalling , flake into small pieces called shallow spalling. Due to the the flaking surface gradually expand, while often extended to the deep, forming deep peeling. The deep peel off contact fatigue failure fatigue source. angular ball bearing
2. Wear Failure
The wear failure refers to relative sliding friction between the surfaces to lead to its work surface metal constantly wear arising VALID. Continuous wear will cause gradual damage of NTN Bearing parts and eventually lead to the loss of dimensiona l accuracy of NTN Bearing and other related issues. The abrasion may affect the shape change, with the gap increasing and work surface morphology changes may affect the lubricant or its pollution reaches a certain level and cause lubrication complete loss of function, and thus the loss of NTN Bearing rotation accuracy even can not operate normally. Wear all kinds of NTN Bearing failure is one of the common failure mode, usually can be divided into the most common abrasive wear and adhesive wear wear form. Means NTN Bearing between the work surface of the abrasive wear debris and contacts the surface of the squeeze inward hard particles or hard foreign or metal surfaces caused by the relative movement of the wear, often in the NTN Bearing work surface to cause galling of the furrow-shaped. Hard particles or foreign matter may come from the host internally or from other adjacent parts of the host system sent NTN Bearing internal lubricating medium. Adhesive wear means uneven f orce are due to the microstructure of the friction surface of the friction surface bumps or foreign objects in the serious deterioration of the lubrication conditions, due to local friction and heat, could easily lead to local friction surface deformation and friction phenomenon of micro-welding, serious when the surface of metal may be partially melted, the force of the contact surface will be a point of local friction welding torn from the substrate increases the plastic deformation. Adhesive - adhesive wear and tear - adhesion cycle constitutes, in general, a slight adhesive wear is called abrasions, severe adhesive wear called the bite. contact ball bearing
3. Fracture failure
The NTN bearing fracture failure mainly due to the defects and overload two factors. When the applied load exceeds the material strength limit, causing parts breakage called overload fracture. Overload Host sudden failure or improper installation. The NTN bearigg parts of the micro-cracks, shrinkage, bubbles, bulk foreign debris, overheating organizations and local burns and other defects in shock overload or excessive vibration will be caused by the defect at the fracture, fracture called defective. It should be noted, NTN bearings the reinspection of raw materials into the plant, forging and heat treatment in the manufacturing process, quality control, process control, through the instrument to correctly analyze the existence of the above-mentioned defects, control must be strengthened in the future. But generally speaking, NTN Bearing fracture failure usually appears most of overload failure.
4. Changes in clearance failure
NTN Bearing at work, due to external or internal factors, changes in the original with the gap, precision, and even cause "killed" called the clearance change fail ure. External factors, such as excessive interference is not installed in place, the amount of 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 reason for the changes in the clearance failure.