冷连轧机多种水平共振状态特性对比研究

Comparative study on characteristics of multiple horizontal resonance states for tandem cold rolling mill

针对冷连轧机工作辊轧制过程中的水平振动现象,建立轧机辊系非线性水平振动模型。采用多尺度法求解得到冷连轧机水平方向主共振、超谐波共振和次谐波共振下的幅频特性方程。仿真表明:轧机参数的变化和不同的共振状态会对系统振动的幅值、共振点、共振区域及脊骨线位置产生明显影响。系统在次谐波共振状态下的振动相对稳定,而在主、超谐波共振情况下有明显的跳跃现象和不稳定区域产生。对比系统位移动态响应,发现次谐波共振响应曲线相对于超谐波共振情况下的位移正、负幅值减小且趋于对称,有利于减少轴承座撞击牌坊现象的产生。对比系统位移分叉特性,发现不同共振状态系统随着干扰力幅值的变化表现出不同的周期运动规律。以上研究为抑制轧机水平振动提供了参数区域和理论参考。

For the horizontal vibration phenomenon during the rolling process of work rolls for tandem cold rolling mill,a nonlinear horizontal vibration model of rolling mill roll system was established,and the amplitude-frequency characteristic equations of main resonance,super-harmonic resonance and sub-harmonic resonance for tandem cold rolling mill in the horizontal direction were solved by the multi-scale method.The simulation results show that the changes of rolling mill parameters and different resonance states have a significant impact on the amplitude,resonance point,resonance area and spine line position of system vibration.The system vibration is relatively stable in the sub-harmonic resonance state,but there are obvious jumping phenomena and unstable regions under the condition of the main resonance and super-harmonic resonance.Compared with the displacement dynamic response of the system,it is found that the positive and negative amplitudes of displacement for the sub-harmonic resonance response curve decrease and tend to be more symmetrical than that of the super-harmonic resonance,and it is beneficial to reduce the phenomenon of the bearing housing hitting the archway.Compared with the displacement bifurcation characteristics of the system,it is found that the system in different resonance state systems show different periodic motion laws as the amplitude of interference force changes.Thus,the above research provides parameter area and theoretical reference for suppressing the horizontal vibration of rolling mill.