Influence of rolling lubrication on the self-excited vibration of rolling mill main drive system

In order to research the mechanism of self-excited vibration in rolling process of F2 rolling mill production in a hot strip mill set and to eliminate the self-excited vibration of rolling mill, the main drive system of the rolling mill was simplified into two single degree of freedom systems with equal natural frequency, and the nonlinear dynamical equations of a twist vibration model of the main drive system were established. The progressive method was used to solve the nonlinear dynamical equations. The results of simulation analysis draw the following conclusions: due to the unstable rolling lubrication, the friction in rolling deformation zone declines and causes the negative damping phenomenon, resulting in the self-excited vibration of the mill. Through the field test and theoretical analysis, it is found: reasonable changes of the dynamic viscosity of rolling lubricating liquid and rolling speed can avoid the appearance of negative damping and eliminate the self-excited vibration of the mill. ©, 2015, Chinese Vibration Engineering Society. All right reserved.