金属轧制过程工作界面非稳态润滑模型研究

基于非稳态流体动力润滑理论和相应的数学物理方法,建立了板带轧制时工作界面非稳态润滑基本模型。通过入口区的分析,确定了入口油膜厚度。考虑了非稳态变量如带张力、轧制速度、入口角等因素对入口油膜厚度的影响,同时还分析了入口油膜厚度的频率响应情形。入口油膜厚度幅值与输入频率成反比。入口油膜厚度呈周期性的变化,但不是正弦波形,所以整个轧机润滑系统是非线性的。非稳态工作区的分析建立在已知的入口油膜厚度基础之上。通过数值计算,定性地分析了后张应力、表面平均速度、入口角等参数对油膜厚度分布的影响。

Research on the Unsteady Lubrication Model of Work Interfaces in Metal Rolling Processes

Based on the unsteady hydrodynamic lubrication theory and its corresponding mathematical and physical methods,the basic model of unsteady lubrication of work interfaces during strip rolling was established.The inlet film thickness was defined by analyzing the inlet zone,and the influence of unsteady variables such as strip tension stress,rolling speed and inlet angle on inlet film thickness was considered.The frequency response of inlet film thickness was also analyzed.The amplitude of inlet film thickness is in reverse proportion with input frquency and its variation is periodical but is not a sine wave.Therefore roller′s lubrication system as a whole is not linear.The analysis of an unsteady work zone is based on the known inlet film thickness.The influence of such parameters as back tension stress,surface average speed,inlet angle etc.on film thickness distribution was analyzed through numerical calculation.