The manufacture of oil-free plain bearings is done by forging, heat treatment, turning, grinding and assembly. The rationality of the processing technology, advanced, stability will also affect the bearing life. The
heat treatment and grinding processes that affect the quality of the
bearing are often more directly related to the failure of the bearing. In recent years, the work of the bearing surface transformation
layer of the study shows that the grinding process and the bearing
surface quality is closely related.
Sliding
bearing bearings show late failure characteristics to serious failure
(usually bearing damage such as shaft, burn, sand spalling, raceway,
bead wear, etc.) most of the time not more than a week, the greater the
capacity of the equipment, the faster the speed , The shorter the interval. Therefore, in the actual bearing fault diagnosis, once the late
fault characteristics, should be judged to determine the failure of
composite bearings, as soon as possible arrangements for maintenance.
After
a period of movement, vibration and noise to maintain a certain level,
the spectrum is very simple, only one or two times the frequency. Rarely
appear more than three times the frequency spectrum, composite bearing
state is very stable, into a stable working period. Continue
to run into the late use, bearing vibration and noise began to
increase, sometimes abnormal sound, but the vibration changes more
slowly, this time, the bearing kurtosis value began to reach a certain
value. We believe that at this time sliding bearing bearing performance for the initial failure.
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