After the NTN bearing has been running for a period of time, it is necessary to check if there is a problem, especially if it is invalid. Today I will tell you about the failure classification of NTN bearings.
1. Contact fatigue failure
Contact fatigue failure refers to the failure of the working surface of the NTN bearing due to the alternating stress. Contact fatigue spalling occurs on the working surface of NTN bearings, often accompanied by fatigue cracks, first from the maximum alternating shear stress below the contact surface, and then extended to the surface to form different spalling shapes, such as pitting or pitting , peeling off into small pieces called shallow peeling. Due to the gradual enlargement of the exfoliation surface, it tends to expand deeper and form deep exfoliation. Deep exfoliation is a source of fatigue in contact fatigue failure.
2. Wear failure
Wear failure refers to the failure of the relative sliding friction between the surfaces resulting in the continuous wear of the metal on the working surface. Continued wear and tear will cause gradual damage to the NTN bearing parts and ultimately lead to loss of dimensional accuracy of the NTN bearing and other related problems. Wear and tear may affect the shape change. The increase of the clearance and the change of the surface of the working surface may affect the lubricant or cause the pollution to a certain extent, resulting in complete loss of the lubrication function, thus causing the NTN bearing to lose the rotation precision or even fail to operate normally. Wear failure is one of the common failure modes of various NTN bearings. It is usually divided into the most common abrasive wear and adhesive wear according to the wear form. Abrasive wear refers to the abrasion caused by the extrusion of foreign hard particles or hard foreign matter or metal surface between the working surface of the NTN bearing and the relative movement of the contact surface, which often causes a furrow-like scratch on the working surface of the NTN bearing. Hard particles or foreign matter may come from inside the host or from other adjacent parts of the host system and be fed into the NTN bearing by the lubricating medium. Adhesive wear refers to uneven friction of the friction surface due to microscopic protrusions or foreign matter on the friction surface. When the lubrication condition is seriously deteriorated, local friction occurs due to local friction, which may cause local deformation of the friction surface and friction micro-welding phenomenon. When the surface metal may be partially melted, the force on the contact surface tears the local friction weld from the substrate to increase the plastic deformation. This adhesive-tear-adhesive cycle constitutes adhesive wear. In general, slight adhesive wear is called scratching, and severe adhesive wear is called bite.
For more information and purchase please visit: https://www.supplyforever.com
