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Shaft parts of machine tools, particularly the spindle, generally with the rolling bearing or sliding bearings are assembled into a whole, and at a very high speed of rotation, and sometimes will produce high heat. If this phenomenon is not removed in time, will cause the EDA bearings overheating, and make the corresponding parts of machine tool temperature and thermal deformation, serious when can cause the spindle and the tailstock unequal height, which not only affects the precision and accuracy of the machine itself, but also the bearing burn out.

In general, if the proper use of thrust ball bearing, can use to reach the fatigue life. But there will be accidents prematurely damage resistance cannot use situation. This early damage and fatigue life of a relative, is known as the quality limits of failures or accidents. More due to installation, use, lubrication on the do not pay attention to, the intrusion of foreign bodies from external study on thermal effect of shaft housing, insufficient etc..
The damage state of bearing such as card injury EDA bearing rings, flanges, may consider as reasons, lack of lubricant, not suitable for defect, foreign oil discharge structure of the intrusion and bearing mounting deflection error, shaft is too large, also for these reasons coincide.
Therefore, only investigated injury, it is difficult to know the real cause of injury. However, if the use of machinery, bearing, bearings constructed around, understand the situation before and after the accident, combined with the bearing damage and several reasons why visits, you can prevent the recurrence of similar accidents.
Judgment of the bearings is available, is mainly considered during thrust ball bearing damage, mechanical properties, the importance of operating conditions, until the next maintenance decision. If you have the following defects can not use, the replacement of the new EDA bearing must be. The inner ring, outer ring, rolling body cage there any cracks or gaps.
1, ring, rolling body fault on any one.
2, rolling road surface, block, scroll marked card injuries on the body.
3, the retainer wear significantly or rivet significant relaxation.
4, the raceway surface, rolling rust body, has the wound.
5, the raceway surface, rolling there is serious indentation and trace.
6, the diameter of the inner ring or outer diameter surface creep significantly.
7, due to thermal discoloration caused obvious.
8 bearing, grease sealed, seals or shields damaged obviously.