基于辊缝动态摩擦方程的铝板冷轧机垂振机理分析

针对高速铝板轧制过程中频繁出现的冷轧机垂直振动现象，结合轧制工艺润滑原理和机械振动理论，建立基于辊缝动态摩擦方程的轧机垂直振动模型.该模型由辊缝几何形状模型，轧辊-轧件工作界面的动态摩擦模型，变形区内的正向轧制应力、摩擦应力分布模型，以及单机架铝板冷轧机二自由度垂向系统结构模型组成.同时，为研究轧辊-轧件工作界面动态摩擦机制影响下的冷轧机垂振机理及系统稳定性，采用某厂单机架铝轧机设备及工艺参数，搭建Matlab/Simulink平台，分别模拟仿真轧制压力和正向轧制应力曲线，验证该模型的有效性；并讨论分析了变形区混合摩擦状态，轧辊-轧件表面粗糙度、轧件入口厚度与系统稳定性的关系.

Vertical vibration mechanism analysis of aluminum cold rolling mills based on the dynamic friction equation in roll gap

Based on the lubrication principle of rolling process and the mechanical vibration theory, a vertical vibration model of single-stand aluminum cold rolling mills was established with the consideration of dynamic friction state in roll gap to study vertical vibration phenomena in high speed rolling of thin strips. This model includes the geometric model of roll gap, the dynamic friction model of the roll-strip working interface, the distribution model of principle rolling stress and friction stress, and the two-degree-of-freedom vertical structure model which is coupled with the former three models. In order to analyze the vertical vibration mechanism and system stability under dynamic friction state in roll gap, the rolling force curve and normal rolling stress distribution curve were simulated separately on Matlab/Simulink platform for validating this model, with the actual data of a single-stand aluminum cold rolling mill. Moreover, the dependences of the system stability on strip entry thickness, mixed friction state and rolls-strip surface roughness were dis-cussed in this article.