考虑润滑粗糙界面的叶片辊轧机辊系非线性振动特性

Nonlinear vibration characteristics on blade rolling mill roll system considering lubrication rough interface

针对粗糙形貌导致界面行为发生变化进而影响叶片辊轧机辊系动力学特性的问题,建立了综合考虑支撑轴承以及楔板的表面形貌影响的叶片辊轧机辊系的垂直振动模型,计算了不同粗糙形貌的楔板与轧辊的接触载荷以及支撑轴承的非线性接触刚度。采用数值积分法求解了叶片辊轧机辊系垂直振动的动力学方程,分析了界面粗糙形貌对轧机辊系动力学响应特性的影响。研究结果表明:叶片辊轧机辊系振动位移幅值随着分形维数的增大逐渐减小,振动频率幅值也随之减小,且系统出现次谐波振动,表现出多频率振动现象。研究结果为实现辊轧机系统垂直振动控制提供了理论依据。

For the problem that the change of interface behavior caused by rough morphology affected the dynamic characteristics of blade rolling mill roll system,a vertical vibration model of blade rolling mill roll system considering the influences of support bearing and surface topography of wedge plate was established,and the contact loads between wedge plate with different rough morphologies and roll and the non-linear contact stiffness of support bearing were calculated.The dynamics equation of the vertical vibration for blade rolling mill roll system was solved by numerical integration method,and the influences of interface rough morphology on the dynamic response characteristics of rolling mill roll system were analyzed.The research results show that the vibration displacement amplitude of blade rolling mill roll system gradually decreases with the increasing of fractal dimension,the vibration frequency amplitude also decreases,and the system appears sub-harmonic vibration,showing the phenomenon of multi-frequency vibration.The research results provide a theoretical basis for realizing the vertical vibration control of rolling mill system.