Date: 2013-08-20

Rolling bearing damage investigation and Countermeasures

Rolling bearing fatigue failure is a failure of the surface form, mainly for fatigue crack initiation, propagation and fracture process, long-term effects produced by alternating load fault in the metal. Cracks in two aspects:
1, on the surface, this is a rolling bearing in rolling contact process, due to the external load change caused by periodic force role in the working surface of the plastic deformation and strain hardening surface contact, and finally in small crack from the inner surface of the development, the formation of surface cracks in between, because the work surface of the wedged into the lubricant, open force, crack down on the wall, forcing the crack advance;
2, from the surface layer, repeated pressure, surface contact, the initial crack crack in the exposed surface and a certain depth, along the surface direction angle, to a certain depth, after the contact of the surface, and beyond the surface, corrosion and eventually split, leaving a horse pit.
Rolling bearings from the surface, or from the surface layer, the two goals ( carburizing, quenching and other surface heat treatment, if uneven hardness, microstructure, and non uniform stress and other adverse, the contact stress is generally from the opposite underground crack under the influence, if the part surface quality is poor, there is a defect ( oxidation, decarburization ), friction or lubrication, the surface crack.
Control of raceway acoustic methods are: the selection of bearing low noise rolling bearings which waviness small, carefully select the use conditions. Rolling road sound often affects the entire mechanical noise, reduce rolling road sound can reduce the noise of the whole machine.
Bearing in the correct use, can have a very long life. If damage occurs prematurely, probably because the wrong selection, use of improper or poor lubrication caused.
Therefore, in the installation of the rolling bearing, we need to record the machine type, location, conditions of use and around with. Based on the study of types of bearing damage, the problem occurs when the use of the environment, in order to avoid a similar situation from happening again.

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Next: Measurements of high temperature bearings before mounting

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