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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.
In view of the frequent vertical vibration of cold rolling mill during high speed aluminum plate rolling, the vertical vibration model of rolling mill based on the dynamic friction equation of roll gap is established by combining the lubrication principle of rolling process and mechanical vibration theory.The model is composed of the geometric model of roll gap, The dynamic friction model of roll-rolling work interface, the model of forward rolling stress and friction stress distribution in the deformation zone, and the two-degree-of-freedom vertical structure model of single-frame aluminum cold rolling mill.At the same time, - The rolling mechanism and system stability of the cold rolling mill under the influence of the dynamic friction mechanism of rolling work interface, adopting the equipment and process parameters of a single-stand aluminum mill in a factory to build the Matlab / Simulink platform, simulating the rolling pressure and the forward rolling Stress curves to verify the validity of the model. The relationship between the mixed friction state in the deformation zone, the surface roughness of the roll-rolled piece, the thickness of the entrance of the rolling piece and the stability of the system is analyzed and discussed.