TIMKEN bearings exhibit strong regularity during their use and are very repeatable. Normal high-quality bearings (bearings) are relatively small in vibration and noise at the beginning of use, but the spectrum is somewhat scattered and the amplitude is small, which may be due to some defects in the manufacturing process, such as surface burrs.
After a period of motion, the vibration and noise are maintained at a certain level, and the spectrum is very single, only one or two times the frequency. There are very few spectrums above the power frequency, and the bearing status is very stable and enters a stable working period.
After continuing to run, the vibration and noise of TIMKEN bearings began to increase, and sometimes abnormal sounds appeared, but the change of vibration increased slowly. At this time, the bearing kurtness value suddenly reached a certain value. We believe that the bearing is an initial failure at this time.
At this time, it is required to closely monitor the TIMKEN bearing and pay close attention to its changes. After that, the bearing kurtosis value begins to drop rapidly and approaches the normal value, while the vibration and noise begin to increase significantly, and the increase rate begins to accelerate. When the vibration exceeds the vibration standard (such as ISO2372 standard), the bearing kurtosis value also begins. Rapid increase, when both the vibration standard and the kurtosis value exceed the normal value (the available kurtosis relative standard), we believe that the bearing has entered the late fault production, it is necessary to repair the equipment in time and replace the bearing.
The bearing exhibits late fault characteristics to serious faults (generally bearing damage such as axle hung, burn, sand frame spalling, raceway, bead wear, etc.). The time is not more than one week. The larger the equipment capacity, the faster the speed. The shorter the interval. Therefore, in the actual bearing fault diagnosis, once the late fault characteristics are found, the bearing should be judged decisively and the repair should be arranged as soon as possible.
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