There were three serious failures of cage fracture of the radial bearing of distribu-tion shaft of 16#and 17#gear box of rolling mills of Masteel Special Steel High-speed Wire Rod Mill,technical personnel installed vibration sensors in the gear box for monitoring after the first acci-dent occurred.In the later two bearing cage fracture accident,the online vibration monitoring sen-sors cannot catch the abnormal vibration signal caused by the bearing cage fracture 24 hours ahead of time.In view of those problems this paper introduces the reason analysis.After replacing the bear-ing cage from steel to copper,which has stronger plasticity and ductility,the unit operated for four months without any fracture of the bearing cage.
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