NSK bearings will inevitably damage occurred in the operation, if abnormal heat, vibration and noise of a sudden increase of the phenomenon, suggests that NSK bearings may have been corrupted, please check and analyze the reasons. Common failure modes are:
A, indentation
When the external substances into durum in NSK bearings and pressure in the body between the Raceway and will enable the surface indentation. In addition, excessive shock loads can also make the contact surface formed by local plastic deformation of potholes. When the NSK bearing at rest, even if the load is small, due to the vibration of the surrounding environment will also form pits of uniform distribution on the Raceway.
B, wear
When the NSK bearing seal well, bringing dust or particulate matter into the bearings, or poor lubrication, contact caused more severe scratches or wear on the surface, and NSK bearing vibration and noise increases.
C, corrosion
Water or substances such as acids, alkalis, salts or intrusion into or lubricant improper selection of NSK bearings will refer to bearing corrosion, precision bearing even if minor corrosion would scrap the bearing.
D, cracks and fractures
Material defects and improper heat treatment, with the interference is too large, the combination of bad design, such as seating stress concentrations caused by grooves, will form rings of cracks and breakage.
E, Galvanic corrosion
Current through NSK bearings, will produce a small electrical discharge, cause small pits or at the contact surfaces of partial annealing and black highlights. Serious cases into the larger potholes will appear.
F, cage damage
NSK bearings, in particular high-speed NSK bearings, due to lack of lubricant, keeping contact with the body or ring wear, collision, even cage fracture.
G, fatigue spalling
NSK bearing Raceway surface of or, as the role of bear alternating loads of contact surface metal is flaking, and gradually expanded to form pits. If it continues to run, you will form an area of Peel region. Due to improper installation or NSK bearing block hole and shaft in the bearing centerline tilt reasons of early fatigue failure occurs, local area bear larger loads.

 


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