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Shaft parts of machine tools, particularly the spindle, is generally rolling bearings or plain bearings assembled into one, and at a very high speed of rotation, and sometimes produces high levels of heat. This phenomenon does not exclude in a timely manner will result in SKF bearings overheating and corresponding parts of rise in temperature produce thermal deformation of machine tools, serious causes the spindle and tailstock unequal height, which not only affects the precision and accuracy of the machine itself, and bearings would be burned.
In General, if the proper use of SKF bearings, you can use up to reach fatigue life. But there will be accidents injury prematurely, less resistance to the use case. This early injury, and fatigue life of a relative, is referred to as the quality limits of failures or accidents. Installed, used, lubrication of origin does not note that foreign objects from external intrusion, axis, case study on thermal effect of insufficient, and so on.
About SKF bearings damage such as: card injury of bearings rings, flanges, may consider as reasons, lack of lubricant, inappropriate, for oil discharge structure of defect, the intrusion of foreign bodies, bearings large misalignment, shaft deflection, also for these reasons coincide.
Therefore, only investigation SKF bearings damage, it is difficult to know the real causes of injury. However, if you know the bearings around the use of machinery, used condition, bearings structures, to understand the situation before and after the accident, combined with the bearings damage and several reasons why visits, you can prevent the recurrence of similar accidents.
Judgment of the bearings is available, mainly about how SKF bearings damage, mechanical performance, importance, operating conditions, to be determined during the next maintenance. If you have the following defects you can no longer use, new bearings must be replaced. Inner ring, outer ring, rolling elements, cages on any one have crack or gap.
1, rings, rolling elements on any one broken.
2, scroll bars, scroll bars, road surface, retaining edge has a marked card injuries on the body.
3 notable or rivets, cage wear significantly relaxed.
4 surface, rolling, rolling road on the rust, is injured.
5, roll on the road surface, rolling there is serious pressure marks and traces.
6, the diameter of the inner ring, or the outer ring outside diameter surface creep is evident.
7, discoloration caused by the heat of the obvious.
8, into grease bearings, seals or shields damage apparent.
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| 22309EAE4 NSK | 45 | 100 | 36 |
| 21309EAE4 NSK | 45 | 100 | 25 |