Date: 2013-08-20

Iwami NSK bearings run rule and failure

NSK bearing used its strong regularity in the process, and very good repeatability. Normal high quality bearings (NSK bearings) when used at the start, vibration and noise are small, but some scattered spectrum, amplitude is small, it may be due to some defect in the manufacturing process, such as caused by Burr on the surface.
Movement after a period of time, to maintain a certain level of vibration and noise, spectrum is single, only Yi、erbei frequency. Rare three times more than double the frequency spectrum, bearings are very stable, entered a period of stability.
Continue to run into use later, NSK bearing vibration and noise began to increase, sometimes abnormal noise, but changes in the vibration increases more slowly, at this time, bearing kurtosis value suddenly reaches a certain value. In our view, the NSK bearing at this time in the form of the initial fault.
At this point, calls for close monitoring of the NSK bearings, pay close attention to the changes. Thereafter, bearing towering degrees value also began fast declined, and close to normal, and vibration and noise began significantly increases, its increased significantly began accelerated, dang vibration over vibration standard Shi (as ISO2372 standard), its bearing towering degrees value also began fast increases, dang both over vibration standard, and towering degrees value also over normal value (available towering degrees relative standard) Shi, we believes that bearing has entered advanced fault etc, needed timely overhaul device, replaced NSK bearing.
NSK bearing fault feature to demonstrate advanced serious failure occurs (usually bearing damage such as axle, Burns, Sha spallation, Raceway, beads to wear) most of the time not exceeding one week, device capacity larger, faster speeds, shorter intervals. Therefore, actual NSK bearings fault diagnosis, once advanced fault feature, there should be decisive judgment bearing failure, as soon as arrangements for inspection.

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