1. adhesive and abrasive wear
　　The NSK bearing surface is one of the most common failure modes. Bearing sliding friction between getting the surface of metal loss known as sliding friction losses. Continued wear will make the part size and shape changes in bearing clearance increases work surface deterioration, thus losing running accuracy, bearing is not working properly. Sliding wear forms can be divided into abrasive wear abrasion, adhesion, corrosion, wear, fretting, one of the most common glue for abrasive wear and abrasion.
　　NSK bearings the friction between the surface of the part caused by external grinding of hard particles or metal friction surface wear and tear occur within the abrasive wear. It often caused chisel-cut or furrows on the surface of the bearing bruises. External hard particle often comes from impurities in the dust in the air, or lubricant. Adhesive wear out due to friction surface uneven contours of peak friction force, local friction heat friction surface temperature, oil film rupture caused serious dissolve the surface layer of metal will be local, contact adhesive, tear off, then stick the loop process, caused serious friction welding and stall. Vortex flowmeter
　　2. contact fatigue (fatigue wear) failure
　　Contact fatigue failure is all kinds of bearing one of the most common failure modes are bearing surface contact stress resulting from repeated cycle of failure. NSK bearing surface contact fatigue spalling is a process of fatigue crack initiation and extension to crack. Initial contact fatigue crack from the following maximum contact surface first orthogonal shear stress, and then extended to surface pitting flaking or small Flake flakes, which is called pitting corrosion or pitting flaking; the latter is called a shallow flake. Initial crack in hardened layers, Center junction, causing early flaking of the hardened layer, it is called a hardened layer peeling off.



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