NSK bearing failure analysis of the working surface is important part of improving NSK bearing reliability in systems engineering, NSK bearings lost its function in the work, thereby causing the failure, or does not work properly called failure, NSK bearings failure according to their failure and early failure of normal life can be divided into two kinds.
Fatigue failure is one of the NSK bearing surface failure mode, is the long-term effect of metal in the alternating load failure arising under, mainly for fatigue crack initiation and the propagation and fracture process. Cracks of two approaches:
First: from surface produced, that in NSK bearing of contact process in the, due to outside contains of role in work surface caused cyclical changes of contact stress, in surface produced plastic deformation and deformation hardening, last in work surface appears tiny crack, by surface to in development, in the crack formed of two a surface Zhijian, due to lubricant of lobby doors wedged into, makes crack wall by force open, forced crack forward development;
Second: the crack from the surface, that is, under the effect of repeated stress in surface contact, crack first arose in some depth from the contact surface, and along with the surface at an angle of direction, once from the surface at a certain depth is reached, up to the surface and beyond, resulting pitting falling off, left a hemp pit on the contact surface. Cracks arising in or from the surface from the surface, these two situations are objective, parts, surface hardening after carburizing heat treatment, if uneven hardness, organizations such as uneven and adverse stress, under the effect of the contact stress, cracks under normal from the surface. Conversely, if the poor quality of surface processing of parts, there is a defect (oxidation and decarburization), friction or poor lubrication, then cracked the surface.



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