Developments of Vibration Monitoring and Diagnostic Technologies for NTM of Wire-Rod Mill

by Chun-Yung Ko, Chong-Ho Ko

Publisher - China Steel Corporation, Taiwan, R.O.C

Category - Engineering & IT

NTM (No-Twist Mill) of No.2 Wire-rod mill in CSC is a pretty high-speed rolling mill that is capable of operation up to 120 m/s and sustained. This NTM is built to eight roll stands that equips with 18 gear sets in total. Any gear fault will cause immediate shut-down and emergent repair. Each roll stand has a two-stage gear increaser that posses similar dominant frequencies to those of other stands. It is easy to cause misjudgment by applying conventional vibration analysis. According to our diagnostic experiences of NTM in No.2 wire-rod mill, selected successful stories in this article including fault assembly on roll-housing, failure due to bearing damage, resolver misalignment, looseness of retainer locknut and squeeze out of lamiflex thrust washer are presented to highlight the positive benefits of vibration monitoring and diagnostic technologies in preventing catastrophic damage and the loss of unpredictable shut-down for NTM. Meanwhile, several advanced vibration monitoring systems and analyzers based on the above MCM progress and developed by our FOMOS team are also demonstrated briefly.

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