Abstract: By the analysis of the effects caused by the roller vibration on the elastic-plastic deformation state of workpiece, the changing characteristics and the quantic of the rolling force under different directions of vibration are discussed, and a dynamical rolling force model with asymmetric hysteresis deformation impact is established. By taking the 1780 rolling mill for example, the simulation of the dynamical rolling force is performed, then the hysteresis variation characteristic between the rolling force and the vibration amplitude of roller under the change of the factors such as roller radius, roller speed, forward tension, backward tension, entry thickness and so on. It can be indicated from the simulation results that the incessant accretion of the roller radius will lead to the enlargement of the hysteresis region, which means that the increment of the energy dissipation of the system. However, minishing the roller speed and the entry thickness of the steel plate can narrow the hysteresis region, reducing the energy dissipation. Besides, the characteristic of micro-tension manipulation of hot tandem mill is verified by analysing the disciplinarian of the hysteresis curves under the variation of the forward tension and the backward tension. The results can be used to study and inhibit the rolling mill vibration.

Key words: Asymmetric hysteresis, Rolling force, Rolling mill, Vertical vibration