Strong regularity of bearing performance during their use, and the repeatability is very good. Normal quality bearings use, vibration and noise are relatively small, but the spectrum some messy, small amplitude because of defects in the manufacturing process, such as the surface of the burr.
Exercise time, vibration and noise to maintain a certain level, spectrum is single, only one, two octave thrown. Rarely thrown three times the power frequency spectrum above bearing state of chaos, enter into chaos period.
Inheritance into use late run, bearing vibration and noise begins to increase, sometimes thrown different tone, but the change of vibration increases more slowly, at this time, bearing kurtosis values start Passed reaches a certain value. At this point, we thought, bearing that showed initial failure.
At this time, it requires close monitoring of the bearings, and closely monitor its changes. Since then, bearing kurtosis values began to rapidly decline, and is close to normal, while the vibration and noise began to significantly increase the substantial increase began to accelerate when the vibration exceeding vibration scale (as ISO2372 scale), and its bearing kurtosis values began to rapidly increase, when both exceed the vibration scale and kurtosis values than normal (available kurtosis relative scale), we thought that the bearing has entered late failure production and testing equipment, the need for timely replacement of bearings.
The bearings showed late failure characteristics to float to the surface grim failure (generally bearing damage, such as axle, burns, sand frame Spallation raceway the beads wear, etc.) time it tends to be more than a week, the greater the capacity of equipment, the faster speed, its distance shorter time. Therefore, the actual bearing fault diagnosis, once found late failure characteristics should resolutely determine bearing fault, as soon as possible the layout of the test.
Metallurgical quality of the bearing material used to be the main factors affecting premature bearing failure. With the advances in metallurgical technologies (such as bearing steel vacuum degassing), to improve the quality of the raw materials. The proportion of the raw material quality factors in bearing failure analysis has decreased significantly, but it is still one of the main factors bearing failure. The selection is still bearing failure analysis must consider the factors properly.
The main task of bearing failure analysis, is based on a lot of background material, analysis of data, and failure modes to identify the main factors causing bearing failure in order to suggest improvements, extend bearing service period, to avoid bearing the occurrence of sudden early failure.
Sealed bearings in the production has been filling the proper grease; For also set in the host of the bearing in use of the sealing means, to prevent the leakage of the grease.
Greasing the amount is too small, and could easily lead to a lack of fat or dry friction affect longevity. Excessive amount of fat injection will result in substantial leakage of grease, both environmental pollution and wasteful. Thus, the amount of the grease is injected to the bearing little as possible under the premise of the guarantee sufficiently lubricated bearings.


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