基于轧制界面表面粗糙度特征的板带轧机混合润滑特性研究

Research on mixed lubrication characteristics of strip mill based on surface roughness features of rolling interface

综合运用平均雷诺方程、Christensen随机粗糙峰分布理论、摩擦润滑理论和金属轧制变形理论,建立考虑表面粗糙度特征影响的轧制工作界面混合润滑模型,并采用该模型系统分析基于不同表面粗糙度方向、压下率、轧制界面膜厚比、接触载荷比、界面流体压力和接触面积比等混合润滑摩擦性能参数随润滑油卷吸速度或工作区位置变化的情况。研究结果表明:粗糙度横向分布更有利于润滑性能的提高;在相同表面粗糙度下,随着压下率增大,接触面积比和膜厚比减小;在相同压下率下,膜厚比随工作界面润滑油卷吸速度的增大而增大,而接触载荷比和接触面积比随之减小;工作界面表面粗糙度对界面流体压力分布有较大影响,在表面粗糙度最小处流体压力最小。

With the comprehensive application of average Reynolds equation,Christensen random rough peak distribution theory,friction lubrication theory and metal rolling deformation theory,the mixed lubrication model of rolling interface considering the influence of surface roughness characteristics was established.Based on different roughness directions,amplitudes and reduction rates,the changes of film thickness ratio,contact load ratio,distribution of fluid pressure and contact area ratio were systematically analyzed when lubricant entrainment speed and workspace location changed.The results show that the transverse distribution of roughness is more conducive to the improvement of lubrication performance.With the surface roughness amplitude being same,the contact area ratio and the film thickness ratio decreases with the increase of the reduction rate.For the same reduction rate,the film thickness ratio increases with the increase of the lubricant entrainment speed,while the contact load ratio and the contact area ratio decrease.At the same time,the surface roughness of the interface has great influence on the fluid pressure distribution of the interface,and the pressure at the minimum amplitude is the smallest.