It is important to study the vibration of rolling mills to improve the stability of rolling production. A dynamic rolling process model is established by considering the elastic recovery of the exit strip and the influence of multiroll equilibrium, and the accuracy of the model is verified by experimental data. On this basis, based on the distribution of friction force in the deformation zone, the rolling force and rolling torque are nonlinearized. In addition, a rolling mill structure model is established by considering the structure gap and a piecewise nonlinear horizontal-vertical-torsional vibration model of the rolling mill is established by combining the structure model and dynamic rolling process model. Finally, the amplitude-frequency characteristics of the work roll under different external excitation amplitude and the dynamic bifurcation characteristics of the work roll under different gaps are analyzed. The study indicates that, by reducing excitation amplitude and structure gap, the system vibration can be reduced. The research results can provide a theoretical reference for further exploration of the coupling vibration of hot rolling mills.

中文翻译：

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具有结构间隙的热轧机耦合振动特性分析

研究轧机振动对提高轧制生产的稳定性具有重要意义。建立了考虑出口带钢弹性恢复和多辊平衡影响的动态轧制过程模型，并通过实验数据验证了模型的准确性。在此基础上，根据变形区摩擦力的分布，对轧制力和轧制力矩进行非线性化。此外，考虑结构间隙建立了轧机结构模型，并结合结构模型和动态轧制过程模型建立了轧机分段非线性水平-垂直-扭转振动模型。最后，分析了不同外激励幅值下工作辊的幅频特性和不同间隙下工作辊的动态分岔特性。研究表明，通过减小激励幅度和结构间隙，可以降低系统振动。研究结果可为进一步探索热轧机耦合振动提供理论参考。