基于混合润滑模型的轧机工作界面表面形貌及油膜特性  

Surface morphology and oil film characteristics of rolling mill based on mixed lubrication model

作　　者：王桥医[1] 王瀚 崔明超 过山[1] WANG Qiaoyi;WANG Han;CUI Mingcao;GUO Shan(School of Mechanical Engineering,Hangzhou Dianzi University,Hangzhou 310018,China)

机构地区：[1]杭州电子科技大学机械工程学院,浙江杭州310018

出　　处：《中南大学学报（自然科学版）》2021年第10期3484-3493,共10页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(51875146);浙江省自然科学基金资助项目(LY21E050005)。

摘　　要：基于具有任意Peklenik表面模式参数的Christensen曲面和流体润滑平均Reynolds方程,构建轧制过程在混合润滑状态下的数学模型,并利用该模型系统地阐述油膜厚度随轧制速度和压下率的变化情况、不同压下率下工作界面应力分布情况、不同的压下率和粗糙度排列方式下接触面积和摩擦因数随工作区位置的变化情况、不同速度和粗糙度排列方向组合条件下油膜厚度随工作区位置的变化情况以及压下率不变时摩擦因数相对于速度的变化情况。研究结果表明:在不同粗糙度排列情形中,油膜厚度随压下率的减小而增加,粗糙度纵向排列时油膜厚度最小,粗糙度横向排列时油膜厚度最大,粗糙度纵向排列的摩擦力最大,粗糙度横向排列的摩擦力最小;对于不同的压下率和粗糙度排列,界面接触面积从入口到出口都是单调增加的;在不同轧制速度和粗糙度排列方向组合条件下,油膜厚度随着带钢从入口到出口的过程而减小;高速轧制通常会减少摩擦因数,使中性点向出口边缘偏移。Based on Christensen surface with arbitrary Peklenik surface mode parameters and fluid lubrication average Reynolds equation, a mathematical model of the rolling process in the mixed lubrication was established.The variation of oil film thickness with rolling speed and reduction rate, work interface stress distribution at different reduction rates, the variation of contact area and friction coefficient with the position of working area at different reduction rates and roughness arrangement directions, the variation of oil film thickness with the position of working area under the combination conditions of different speeds and roughness arrangement directions, and the variation of friction coefficient with velocity at constant reduction rate were systematically analyzed by using this model. The results show that in various arrangement cases of roughness, the oil film thickness increases with the decrease of reduction rate, the oil film thickness is the smallest in longitudinal arrangement of roughness, the largest in transverse arrangement of roughness, the friction reaches the maximum in longitudinal arrangement of roughness, the minimum in transverse arrangement of roughness;for different reduction rates and roughness arrangement directions, the interface contact area increases monotonically from the inlet to the outlet;the oil film thickness decreases with the process of strip steel from the inlet to the outlet under the combination conditions of different rolling speeds and roughness arrangement directions;high speed rolling usually reduces the friction coefficient and moves the neutral point to the outlet edge.

关 键 词：混合润滑 油膜厚度 压下率 粗糙度 

分 类 号：TH117.2[机械工程—机械设计及理论]