Standard based on mechanical performance and a significant degree of judgment and inspection cycle varies. If following injury, NSK bearing shall not be reused and must be replaced.
1) faults and defects of bearing parts.
2) split of Raceway surface scroll surface.
Bearing fault identification method
Without teardown check, identify or predict bearing trouble-free in operation, to increase productivity and economy is very important.
Major recognition methods are as follows:
1) by voice recognition
By voice recognition needs to have a wealth of experience. Full training is essential to achieve non-NSK bearings to identify bearing sound and sound. This should be done by hand as much as possible to carry out the work. Using the listen or hear can be clearly heard on the sound bar attached to the shell bearing sound.
2) identified by operating temperature
The method is a method to identify, is limited to use in running condition, less change of occasions. To this end, the need for continuous recording of the temperature. If a fault occurs, not only temperature, irregular changes also occur.
3) through State recognition of lubricants
Analysis on lubricant sampling, whether through the level of dirty or metal powder mixed with foreign body to judge. The method could not be closer to the look of NSK bearings or large bearings are particularly effective.
NSK bearing temperature, generally based on NSK bearing outside of room temperature can be speculative, if the uses of oil hole can directly measure the temperature of bearing outer ring, the more appropriate.
Typically, NSK bearing temperature as the operation began slowly to rise, reaches a steady state after 1-2 hours. NSK bearing normal temperature due to the heat capacity of the machine, heat dissipation, speed and load to another. If lubricated, install appropriate, bearing temperature quick rise, abnormal high temperature occurs, in which case you must stop, take the necessary preventive measures. According to a large number of test data, because the temperature under the influence of lubrication, speed, load, environments, value only indicates the approximate temperature range in the table. 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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