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The fatigue life, noise life and lubrication life of Koyo bearings are just Koyo bearings. During the operation of the rolling Koyo bearing, it receives a certain load, that is, static load. However, for the steel ball and raceway,
the stress goes back and forth in Fatigue Life cycles, and the data will be ignited, rolling fatigue will occur, and then the Koyo bearing will reach its service life. The phenomenon is that a part of the rolling surface data suddenly falls like fish scales. This phenomenon is called burnout peeling.
The noise life of the Koyo bearing of household appliances is very short. The load received by the Koyo bearing is very small, and the service life of the Koyo bearing is very long. However, after Koyo bearing operates for a period of time, it will also suffer from wear, increased vibration and noise, deterioration of lubricating grease, etc.
Because of the serious request for the noise of the Koyo bearing of household appliances, when the noise of the Koyo bearing exceeds the allowable local limit, it is Fatigue Life considered that the Koyo bearing can not continue to be used. The total time of low noise operation of Koyo bearing is called Koyo bearing noise life. Lubrication life
The Koyo bearing of household appliances adopts maintenance free grease lubricated sealed Koyo bearing on weekdays. Although Fatigue Life only a small amount of lubricant is required for Koyo bearing lubrication, after a long time of operation,
due to the deterioration and Fatigue Life leakage of grease, Koyo bearing lubrication is poor, and then Koyo bearing fails. The total time when Koyo bearing operates under superior lubrication is called Koyo bearing life.
When the search and inspection of the disassembled NTN bearing is suspended during the regular Fatigue Life maintenance and operation of NTN bearing equipment and the replacement of peripheral parts,
it is required to judge whether the secondary NTN bearing parts can be reused and record the good or bad application conditions. We should also make great efforts to inquire, visit and record the Fatigue Life removed NTN bearings and appearance conditions.
In order to find out and inquire about the remaining amount of Fatigue Life lubricant, after sampling, clean the NTN bearing well.
Secondly, check the raceway surface, rolling surface and joint surface of NTN bearing and the wear condition of standoff frame for damage and abnormal conditions.
In particular, check the running track of raceway surface. To judge whether NTN bearings can be used again, we should think about the damage level of NTN bearings, mechanical function, priority, operation premise, search and inspection cycle, etc.
Search and inspection results. If NTN bearing is found damaged and abnormal, please find out the notice and formulate countermeasures according to the phenomenon of NTN bearing damage.
In addition, the search and inspection results show that if there are the following defects, the NTN bearing can no longer be used, and a new NTN bearing needs to be replaced.
a. Any one of the inner and outer rings, rolling elements and confrontation frame has cracks and fragments.
b. Any one of the inner and outer rings and rolling elements has peeling.
c. The raceway surface, retaining edge and rolling element are significantly jammed.
d. The standoff frame is severely worn or the rivets are loose and ferocious.
e. The raceway surface and rolling element are rusty and scarred.
f. The rolling surface and rolling body have significant indentation and indentation.
g. There is creep on the inner diameter surface of the inner ring or the outer diameter of the outer ring.
h. Overheating and discoloration are fierce.
i. The sealing ring and dust cover of grease sealed NTN bearing are damaged seriously.