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Reasons for INA bearing fatigue failure

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Exhaustion failure is one of the failure methods of INA bearing appearance; it is the failure of metal under the long-term effect of alternating load; the first manifestation is the process of germination, expansion and cracking of fatigue crack. There are two ways to crack:
Top of the list: from the appearance; that is, in the touch process of the INA rolling bearing; the effect of the external load causes the cyclical change of the touch stress in the work appearance; the plastic deformation and the deformation hardening occur in the surface layer; finally, the appearance of the work shows a small crack; Inwardly; between the two appearances of the crack; because the smoothing agent a into; the crack wall is forced to open; forcing the crack forward.
Second: the crack occurs from the surface layer; that is, under the repeated effect of the external surface contact stress; the crack begins to occur at a certain depth from the touch surface; and proceeds in a direction that is a certain viewpoint with the appearance; after reaching a certain depth from the outer surface And the more out to the appearance; eventually formed a pitting off; left a pit in the appearance of the touch.
Cracks occur from the surface or from the surface; both conditions are objective (after the parts are heat treated by carburizing, external quenching, etc.; if there are uneven hardness, uneven arrangement, and internal stress of helium; Under the effect; the crack usually occurs from the surface layer. Conversely; if the surface of the part has poor processing quality; there are disadvantages (oxidation, decarburization); the friction is large or smooth and unsatisfactory; then the crack occurs from the surface.

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