基于动态辊缝的连轧机多参数耦合颤振建模及工程应用

Multi-parameter coupled chatter model and its engineering application of tandem rolling mill based on dynamic roll gap

基于均匀变形理论并考虑轧件加工硬化效应和轧辊弹性压扁效应,先建立轧机动态轧制过程模型,然后将该模型与轧机机架结构模型耦合建立以状态空间表示的轧机单机架颤振模型,再以单机架颤振模型为基础,结合机架间的张力耦合和轧件厚度波动存在的时滞传递效应,建立连轧机耦合颤振模型。通过数值仿真研究轧机颤振在时域上的动力学特性,解释连轧机颤振过程中机架间的张力耦合效应和轧件厚度波动在机架间存在的时滞传递效应。研究结果表明:基于动态辊缝的连轧机多参数耦合颤振建模为实际生产过程中连轧机颤振情况的分析以及连轧机系统稳定性的控制提供了良好的理论指导。

The dynamic rolling process model of rolling mill was established based on the uniform deformation theory considering the work hardening effect and the work roll flattening effect.By coupling the model with the mill stand structure model,a single stand vibration model of rolling mill expressed in state space was established.Based on the single stand vibration model,a coupled chatter model of tandem rolling mill combining the interstand tension coupling and the time-delay transmission effect of the strip thickness variation between stands was built.The dynamic characteristics of rolling mill chatter in time domain were studied by numerical simulation,and the inter-stand tension coupling and the time-delay transmission effect of the strip thickness variation during regenerative chatter were explained.The results show that the multi-parameter coupled chatter model of tandem rolling mill based on dynamic roll gap provides good theoretical guidance for the analysis of the chatter of tandem rolling mill and the control of the stability of the tandem rolling mill system in practical production.