In this paper, we investigate the rolling interface instability characteristics caused by the coupled motion of strip and the roll system. Based on the experimental test, the dynamical behaviors of the rolling mill under the motion of roll system and the strip show multi-modal vibration phenomenon, which are consistent with the variation of rolling interface force and energy parameters. Then, the dynamic geometric parameters of rolling interface and the dynamic stress models are established. Through the simulation analysis, it can be concluded the multi-modal stress state of the rolling interface is caused by the coupling motion of the strip and the roll system. The results show that the multi-modal stress of the rolling interface cause the rolling process instability, leading the "pulling " on the strip and "beating" on the work roll, which change the instability state of the rolling process. This study provides a theoretical basis for the study of multi-modal vibration characteristics of rolling mill.

在本文中，我们研究了由带钢和轧辊系统的耦合运动引起的轧制界面不稳定特性。根据试验测试，轧机在轧辊系统和带钢运动下的动力学行为表现出多模态振动现象，这与轧制界面力和能量参数的变化一致。然后，建立了滚动界面的动态几何参数和动态应力模型。通过仿真分析，可以得出轧制界面的多模态应力状态是由带钢与轧辊系统的耦合运动引起的。结果表明，轧制界面的多模态应力导致轧制过程不稳定，导致带钢“拉”和“跳动” 在工作辊上，改变了轧制过程的不稳定状态。该研究为轧机多模态振动特性的研究提供了理论依据。