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Quality inspection of bearing vibration standard
1. National standards for vibration Acceleration (commonly known as z-standard)
The criteria developed earlier, to measurement SKF bearings vibration acceleration value to rotate, to judge the quality of bearing grade, divided into Z1, Z2, Z3, from low to high level of quality. Currently bearing manufacturers are still used in order to measure the pros and cons of bearing vibration acceleration value, simply reflects the fatigue life of bearings.
2. Vibration velocity standard (commonly known as mark v)
Because of the vibration acceleration standards have not been abolished, this standard is based on mechanical industry presentation standards, is the reference to European standards, combined with China's actual situation and needs, to detect the vibration velocity of FAG bearings Division bearing the quality level (equivalent to national standards). Classified as v, V1, V2, V3, V4, five quality levels. Various quality levels from low to high for ball bearings v, V1, V2, V3, V4, and roller bearings (cylindrical, tapered) quality level from low to high as v, V1, V2, V3, four quality grades. It is to detect the Nachi bearing different frequencies (low frequency, medium frequency and high frequency) vibration speed to reflect quality bearings. General analysis of bearings for geometry problems (such as steel ring ellipse), roller/rolling quality issues, maintaining quality, than to examine quality of bearing vibration acceleration there has been remarkable progress. Domestic exports of bearings, our military and aerospace industries in Europe are carried out according to the standard bearing quality inspection, detection of bearing quality in Europe and identifying counterfeit bearings provide a viable means.
NSK bearings quality inspection currently exist two standard parallel situation, and "z" grade high quality bearings, in "v" test may not have a good quality, there is no correlation between the two. This bearing quality inspection is to pay particular attention.
Bearings for vibration measuring instrument
TIMKEN bearings in run in the, ISO2372 standard although is to vibration speed to judgment vibration is over, but in site actual in the to special concern bearing acceleration value of changes, bearing of damaged process most is early performance for fatigue injury, this General can performance for obvious of acceleration rise, as fatigue of development, gradually appeared vibration speed and displacement of rise, predicts with bearing appeared has fatigue damage. When testing a special bearing, careful attention to the vibration values are unstable to swing (analog pointer instrument is recommended, you can observe very obvious), if there is a swing, Herald appeared unstable vibration, acceleration, especially speed simultaneously increases, most likely bearing "sets".
For new equipment, detection acceptance Shi, while vibration is small, meet national standards, but in bearing parts appeared small degrees of vibration swing phenomenon, excluded bearing tie problem (playing set) Hou, very has may is INA bearings geometry size exists problem, as bearing rims oval, scroll body after oval long axis location Shi, may due to gap reduces caused scroll body moments card died, follow-up scroll body continues to extrusion, make scroll body produced sliding, each a scroll body will this appeared sliding, caused not stability signal appeared. The problems encountered during the detection of Shanxi 220KW new motor, dissolution inspection test bearings, proof to judge exactly right.
Special Note: when you check the bearings, KOYO bearings acceleration values must not be ignored. Acceleration of better early warning of rolling bearing failure.
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| 32952XUE1 NTN | 260 | 360 | 63.5 |
| 32048XU NTN | 240 | 360 | 76 |