Simple bearing failure diagnosis

Bearing a rotation, inner ring and outer ring raceway surface, with rolling body is rolling contact, as the dark side, thus orbit trajectory are attached to the raceway surface does not belong to abnormal, which can be learned that load conditions, so at the time of removal of bearing, please keep close attention and observation on the surface of the raceway. If you look closely at orbit, will know that only bear radial load, bear the axial load of big, inherit the torque load, or extreme rigid in bearing box is not equal. Can check if the bearing with unexpected load and installation error is too big, etc. , shall be investigated and be hold clues to the cause of bearing damage. Lubrication is very important, not only for bearing, also for all of the bearing. But please note that the bearing should not add too much grease. And then replace the bearing lubricant. Use after xie used engine oil, engine oil lubrication bearing if possible, should be impregnated with fresh oil and let the machine in low speed rotation for a few minutes. As far as possible make the oil collecting residual pollutants, and then purging in addition to the oil. And the use of grease lubrication bearing in replacing grease, Joe used in addition to the device should be avoided with any part of the cotton material come into contact with the bearing. Because these residues fiber may wedged in between the scroll and damage, especially the application of small bearing more need to pay attention to this problem. A diagnosis method crossing the peak factor, crest factor, defined as the ratio of the peak position and RMS. It is a dimensionless parameter, it is used for diagnosis of rolling bearing has the advantage that it is not affected by rolling smoking bearing geometry size, the influence of the rotational speed and load to, is not influenced by sense organ of the music spirit worship degrees. Crest factor for point sex types of fault diagnosis. Method of use: detection of crest factor change trend with time, the general experience. When smoke rolling bearing is normal. Crest factor is about 3 - 5; Bearing damage and development, crest factor are increased, more than 3 - 5 and may reach 10 - 15. Serious fault, crest factor back to 3 two, kurtosis diagnostics kurtosis is defined as the normalized fourth-order central moment. It is also a boundless steel parameter. It is used to diagnose rolling bearing has the advantage that it is not affected by rolling smoking bearing geometry size, speed and load to impact. Also not affected by the sensor sensitivity. Kurtosis is also suitable for candle in the valley of the diagnosis. Method of use: test kurtosis change trend with time, the general experience that when smoke rolling bearing is normal. Kurtosis is about 3; Bell and afford the inkstone reported injuries and development, kurtosis increase obviously. Even can reach dozens; Fault serious when, in the peak due to teach again back to around 3.