金属轧制入口区润滑界面滑移分析

Lubricating Interface Slip Analysis of Inlet Zone in the Metal Rolling Process

金属成形加工中润滑界面滑移分析是工程技术人员普遍关注的重要课题之一。因此，利用有限元及参数二次规划法分析研究了金属轧制过程中入口区的界面滑移问题。结果发现，滑移速度可用参数二次规划技术直接获得，在压力分布和滑移速度之间不存在迭代过程；界面滑移可以使润滑油膜厚度明显减小，这与文献报道的试验结果一致；粘塑性润滑剂的初始极限剪应力和极限比例常数对界面滑移的影响很大，从而影响了油膜厚度；当润滑剂和工件材料及厚度确定以后，轧制速度对油膜厚度的影响较小．粘塑性润滑剂的这种润滑特性有益于轧制加工。

Lubricating interface slip analysis in metal rolling process is an important subject whichrivets the engineers and technicians' special attention. The interface slip of inlet zone in metal rollingprocess was analyzed using the finite element method and parametric quadratic programming(PQP),The results showed that the slip velocity can be directly obtained by means of PQP and theiterative process has not occurred between the lubrication film pressure distribution and the slipvelocity;the interface slip makes the thickness of lubricating oil film obviously decrease,this resultsis in keeping with that of report. The initial limiting shear stress τ0 and the limiting proportionalconstant k of adhesive-plastic lubricant have the great effect on the interface slip,thus,they act onthe oil film thickness;after fixing the lubricant,material of work piece and thickness,the effect ofrolling velocity on thickness of oil film decreases;this lubrication property of viscous-plasticlubricant is of particular advantage to rolling processing。