Roller bearing showed strong regularity in the course of its use, and the repeatability is very good. Normal quality of roller bearing used in the beginning, vibration and noise are relatively small, but some scattered spectrum, amplitude is smaller, may be due to some defects in the manufacturing process, such as surface burr caused by.
The campaign for a period of time, to maintain a certain level of vibration and noise, frequency spectrum is very single, only appeared one or two times. Rarely appears three times above the frequency spectrum, roller bearing condition is stable, entered the period of stable work.
Continue to run into the use of late, roller bearing vibration and noise began to increase, sometimes appear abnormal sound, but the change of vibration increases more slowly, at this time, bearing kurtosis value suddenly reaches a certain value. We think, this time bearing which shows the initial fault.
At this time, requires close monitoring of the bearing, pay close attention to the change. Since then, bearing kurtosis value began to decline rapidly, and close to the normal value, while the vibration and noise significantly increased, the increase amplitude begins to accelerate, when vibration more than vibration standards (such as ISO2372), the roller bearing kurtosis value began to increase quickly, when both exceeding vibration standard, and kurtosis value also more than the normal value (available kurtosis relative standard), we believe that the roller bearing has entered advanced fault property, the need for timely maintenance, replacement of bearings.
Roller bearing fault feature to show late failure occurs (usually bearing damage such as axle, burn, sand frame spallation, raceway, beads to wear) most of the time not more than one week, equipment greater capacity, higher speed, the interval time is short. Therefore, in the actual fault diagnosis of bearing, once found late fault characteristics, should be decisive judgment roller bearing fault, arrange the repair as soon as possible.



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