全膜润滑金属成形工艺的有限元仿真分析

全膜润滑的金属成形的数值分析非常少,这主要是由于求解润滑模型的方法只适用于轴对称和平面应变情况.因此,本文中提出了全润滑膜润滑和金属成形有限元法相结合的统一方法,适用于稳态和非稳态的三维成形工艺,也适用于轴对称和平面应变情况.而一个轴对称拉深成形被用来做一个样板实验.该法大幅度增加了仿真的精度.而理论计算的润滑膜厚与实测值相一致,这也证明本文的方法优于其它方法.

A Finite Element Analysis of Full Film Lubricated Metal Forming Process

Very few attempts have ever been made to analyze a complex full film lubricated metal forming process numerically,due to the fact that usually the methods of solving the lubrication model are available for axisymmetric and plane strain cases only.Accordingly,a unified procedure of combining the finite element codes of full film lubrication and metal forming has been developed for either steady or unsteady three-dimensional processes including axisymmetric and plane strain cases.The availability of the method was proved by a published problem and an axisymmetric stretch forming process was therefore adopted as a benchmark.It showed that the precision of simulation can be enhanced substantially by the present method.A better agreement between predicted and experimental film thickness verifies the superiority of the proposed method over the prior studies.