The Sensitivity Analysis of Inherent Frequency of Roll Mill’s Main Drive System

Abstract

In order to avoid the beat vibration of rolling mill, taking F1 rolling mill of 1780 tandem mill as an example, a twelve DOF branched torsional vibration model of main drive system of F1 rolling mill was constructed. Then the inherent frequency of the rolling mill and the corresponding vibration modes of every inherent frequency were calculated. Meanwhile, the sensitivity of first and second inherent frequency with the change of equivalent rotational inertias and torsional stiffness of rolling mill were analyzed, and the most sensitive parameters which influence on first and second inherent frequency were found out. The result shows that the equivalent inertias of upper and lower work rolls and equivalent stiffness of upper and lower joint shaft of drive system were most sensitive parameters, which are easier to change first and second inherent frequency of drive system. The research will provide theory reference for adopting proper mechanical parameters in equipment design.