From corrosion, cracks, spalling, indentation, abrasion, are reflected in the measurement of bearing vibration, vibration damage to the bearings NSK bearings are very sensitive, so, NSK bearings through the use of a special measuring bearing vibration (frequency Analyzer, etc) can measure the size of the vibration, through frequency cannot be inferred from specific situations of exception. Measured due to the numerical bearing conditions of use or different sensors such as installation location and therefore require prior to analysis and comparison of measurement values of each machine are determined criteria.
Even with minor injuries such as split as NSK bearings, also is making an abnormal sound and irregular sound, so using the measured sound can be distinguished using acoustic logging, in the operation of NSK bearing rolling sound and sound to check, played a preventive role in advance.
　　1. surface metal Raceway spalling
　　Bearing rolling element and the inner and outer rings are subjected to cyclical fluctuation load on Raceway surface, resulting in a cycle of change
Contact stress. When a stress cycle count reaches a certain number, scroll or face inner and outer ring raceways produces fatigue spalling. If the NSK bearing load is too large, will exacerbate this fatigue. In addition, the NSK bearing install is not straight, bent shafts, Raceway spalling phenomena can also arise. Raceway on bearing fatigue peeling can reduce the running accuracy of the shaft, enabling body to vibrate and noise.
　　2. bearing burn
　　NSK bearings burned its Raceway, the scroll has temper color on the body. Burn quality reasons is lack of lubrication, lubricants in General does not meet the requirements or deterioration, such as NSK bearing Assembly too tight.
　　3. plastic deformation
　　Bearing raceways and rollers do not appear on the contact surface pits, evenly, notes bearing plastic deformation. A result of a large static bearing load or under impact loading, local stress more than material yield limit of the working surface, which
Scenario generally occurs on the low speed rotation of the bearing.
　　4. the housing washer crack
　　Cracks can be caused by bearing retainer bearing too tight, inclusive deformation of NSK bearings, housings, such as poor surface processing.
　　5. cage fracture
　　The reason for this is lack of lubrication, rolling crush, seat tilt, and so on.
　　6. glue the metal cages on a rolling
　　Possible cause is the rolling was stuck in a cage or lack of lubrication.
　　7. seat Raceway badly worn
　　Falling into the foreign bodies may be circles, lack of lubricating oil or lubricant brands is inappropriate.
If the uses of oil hole can directly measure the bearing outer ring temperature, is more appropriate. Under normal circumstances, NSK bearing temperature, generally based on the bearing outside of room temperature can be presumed. If lubricated, install appropriate, bearing temperature quick rise, abnormal high temperature occurs, in which case you must stop, take the necessary preventive measures. Usually, temperature of the bearings as the run began to rise slowly, 1-2 hours later to reach a steady state. NSK bearing normal temperature due to the heat capacity of the machine, heat dissipation, speed and load to another. If necessary, use heat detector to monitor bearing temperatures at any time, and alarm or stop automatically when the temperature exceeds the specified value prevents burning shaft accident.


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