Bearing grease selection have a direct relationship with the stable operation of the device. Bearing in the minor operation noise is allowed in the work, if the sound is too loud or abnormal noise or impact sound, then NSK bearings is faulty. Are, bearing considering greases select required from the following aspects:
1. rust-inhibiting properties:
Antirust preferably insoluble in water. Fats and oils should have good adhesion, the use of angular contact ball bearings with antirust oil required in effect. And steel exterior form an oil film. NSK bearing noise fault reasons and against the Timken bearings NSK bearings run agent
2. mechanical stability:
Lead to disclosure. During normal operation, grease the machine will become soft. Oils from within the housings are dumped into the bearing. If the mechanical stability of the grease is insufficient, in the operation of, would make oil SOAP mechanical disintegration in the structure, causing oil to be destroyed, and thus lose lubrication.
3, NSK bearings run hazard:
(1) NSK bearing the causes of noise are more complex, one is the inner and outer rings mating surfaces of the bearing wear. Because of this wear, damaged bearing shells, bearing and shaft fit, causes the axis deviates from the correct location, noise resulting from the axis in high-speed motion. When you are bearing fatigue, its surface metal flake, also bearing radial clearance increases the noise. In addition, insufficient lubrication of the bearing, the formation of dry friction and bearings broken produces abnormal noises. After the NSK bearing wear loose, loose cage damage, would also have abnormal noise.
(2) when the institutions, installed bearing parts allows a certain degree of temperature, when you touch body shell with your hand, should not feel hot to normal, instead it indicates that the bearing temperature is too high.
(3) quality does not meet the requirements or deterioration of lubricant, lubricant viscosity is too high; body fitted too tight (insufficient gap); Bearing Assembly too tight; NSK bearing washer on the shaft or in the shell rotation; load is too large; NSK bearing cage fragmentation, and so on.
(4) from the indentation, rust, cracks, spalling, and wear are reflected in the measurement of bearing vibration, bearing vibration damage to the bearings are very sensitive, so, through the use of special NSK bearing vibration Measurer (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.
(5) as bearing even with minor injuries such as split, also is making an abnormal sound and irregular sound, using the acoustic measurement can be distinguished using acoustic logging, NSK bearings in operation acoustic and sound to check play a preventive role in advance.
(6) if the uses of oil hole can directly measure the temperature of bearing outer ring, the more appropriate. Under normal circumstances, the 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. The normal temperature of the bearing due to the heat capacity of the machine, heat dissipation, speed and load to another.
If necessary, use heat sensors can monitor NSK bearing temperature at any time, and alarm or stop automatically when the temperature exceeds the specified value prevents burning shaft accident.


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