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Bearing quality testing

Update:09-11-2019
Summary:

National standard 1. Vibration acceleration national st […]

National standard
1. Vibration acceleration national standard (commonly known as the Z-standard)
The earlier standards, to measure the vibration acceleration at the time of bearing rotation, to determine the quality level of the bearing, into Z1, Z2, Z3 three quality from low to high level. Domestic bearing manufacturers still in use, in order to measure the vibration acceleration values ​​the merits of the bearing, just simply reflect the fatigue life of the bearing.
2. Standard vibration velocity (V commonly known as standard)
Since the original vibration acceleration standards had not been abolished, so the standard is the machinery industry ministerial standard appears, is a reference to European standards combined with China's actual situation and the need to develop in order to detect bearing vibration velocity divided by the quality level of the bearing (equivalent to the country standard). Divided into V, V1, V2, V3, V4 five quality levels. Ball bearings of various quality levels from low to high as V, V1, V2, V3, V4; roller bearing (cylindrical, conical) quality level from low to high as V, V1, V2, V3 four quality grades.
It is detected bearing different frequency (low, medium, high) b vibration speed to reflect the quality of the bearing. The bearing can be generally analyzed whether there are problems geometry (e.g., oval rims), the quality of raceway / rolling element cage holding quality, vibration acceleration ratio to examine the quality of the bearing has progressed significantly. At present, exports to Europe bearing, our military and aerospace industries are bearing quality testing carried out in accordance with the standards, detection and resolution of quality European imports of counterfeit bearings imported bearings provide a viable means.
Detecting the presence of bearing quality two standard parallel situation, and "Z standard" quality grade high bearing performance is not necessarily good quality when a "V standard" test, there is no correspondence between the two. This quality inspection of the bearing is to pay special attention.

 

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