Because the original vibration acceleration the standard is not abolish, so the standard based on mechanical industry standard of the first-class appear, is the European standard reference with the actual situation in our country and the need to make, to detect bearing vibration velocity to differentiate bearing quality level (equivalent to the national standard). Divided into V, V1 and V2 and V3, V4 five quality grade. All kinds of ball bearings from low to high quality level for V, V1 and V2 and V3, V4; Roller bearing (cylindrical, tapered) from low to high quality level for V, V1 and V2 and V3 four quality grade. It is based on detection bearing different shows (low frequency, intermediate frequency, the high frequency) vibration velocity to reflect the bearing b quality.

Bearing in operation, the ISO2372 standard though is to judge whether the vibration velocity exceeds bid, but in the actual should pay special attention to the change of the acceleration is bearing, bearing damage process is mostly the initial presentation of fatigue damage, it can generally performance for visibly acceleration rise, along with the development of fatigue, gradually appear vibration speed and displacement increases, indicates the bearing appeared fatigue damage. Especially for the bearings of test, careful attention to vibration value whether there is not stable swings (suggest using analogue pointer type instrument, can look very obvious), if appear swing, indicating that appeared unstable vibration signals, acceleration is big also, especially increasing speed, is likely to exist bearing "play set of" the breakdown.

 
For new equipment, testing acceptance, although vibration is small, conform to the state standards, but in bearing a small part of the vibration amplitude swinging phenomenon, eliminate the match problem bearing (play sets), is most likely bearing geometry size problems, such as bearing steel elliptical, scroll through long axis of the oval body position, may be due to reduce the gap by instant roller card to die, the follow-up to continue roller extruding, make produce roller sliding friction, each will appear in the roller sliding friction, cause unstable signal appear.
 
 



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