锻压技术

基于动态摩擦和分段刚度的热轧机水平振动行为分析

英文标题：Analysis on horizontal vibration behavior of hot rolling mill based on dynamic fiction and piecewise stiffness

作者：王运涛王磊田杰宇

分类号：O322；TH113

出版年,卷(期):页码：2022,47(4):200-206

摘要：

考虑工作辊振动时轧制界面间摩擦力的变化状态，以及工作辊水平方向轴承座撞击牌坊的情形，建立了相应的动态摩擦模型和分段刚度模型，并基于此建立了热轧机水平方向非线性振动模型。研究了线性阻尼项、动态摩擦力三次非线性项、分段刚度项以及外扰幅值变化下热轧机水平振动系统的幅频特性。最后，研究了外扰力变化下热轧机振动系统的分岔行为，发现外激幅值的变化可以使振动系统进入混沌状态，并且存在倍周期分岔通向阵发性混沌和混沌运动等显著现象，这正是引起带钢呈现明暗相间条纹的原因之一。上述研究内容为抑制热轧机辊系振动和参数的优化提供了理论依据。

Considering the change state of friction force between rolling interfaces when the work roll vibrates and the condition of horizontal bearing block of work roll hitting against mill housing, the corresponding dynamic friction model and piecewise stiffness model were established, and the horizontal nonlinear vibration model of hot rolling mill was established. Then, the amplitude frequency characteristics of horizontal vibration system for hot rolling mill under linear damping term, cubic nonlinear term of dynamic friction force, piecewise stiffness term and external disturbance amplitude variation were studied. Finally, the bifurcation behavior of the vibration system for hot rolling mill under the change of external disturbance force was studied. It is found that the change of external excitation amplitude can make the vibration system enter into a chaotic state, and there are obvious phenomena such as period doubling bifurcation leading to paroxysmal chaos and chaotic motion, which is one of the reasons for the light and dark stripes on strip steel. Thus, the above research provides a theoretical basis for the suppression of roll system vibration and parameter optimization of hot rolling mill.

基金项目：

河北省教育厅高等学校科学研究计划项目(QN2019803)

作者简介：王运涛（1991-），男，硕士，讲师 E-mail：wangyunt1991@163.com

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