多方向耦合振动连轧机再生颤振建模及应用

Multidirectional regenerative chatter model of tandem rolling mills and its application

为了研究连轧机的再生颤振机理,首先综合考虑轧制过程中的轧辊弹性压扁和轧件加工硬化效应的影响以及轧机工作辊的振动所造成的轧制辊缝在垂直和水平方向的变化,建立新的动态轧制过程模型,将该模型与多方向耦合振动的轧机结构模型结合,建立单机架轧机振动模型,而后对机架间的张力耦合和轧件厚波动在机架间的有时滞传递进行表征,建立新的多方向振动耦合的连轧机再生颤振系统模型。以所建立的模型为基础,根据劳斯判据和积分值检验法分别对典型五机架冷连轧机每个单机架系统和多机架耦合的再生颤振系统进行稳定性分析。研究结果表明:所建立的再生颤振模型正确。

To explore the regenerative chatter mechanism in rolling, a new dynamic rolling process model was established firstly. The new model considers the work roll flattening effect, the rolled piece working hardening effect and the roll gap variation generated in vertical and horizontal direction by the work roll vibration. A single stand vibration model was built by coupling the new dynamic rolling process model with multi direction mill stand model. And then the interaction factors between adjacent rolling mill stands, namely the inter-stand tension variation and strip gauge variation passed onto the next stand after a delay time, were represented in functions. Finally, a new multi direction multi stand regenerative chatter model was built. Based on the models, stabilities of each single stand vibration model and multi stand regenerative chatter model were analyzed using the Routh criterion and the integral criterion respectively. The results prove that the proposed model is correct.