STUDY ON THE PROBLEMS OF CONTACT IN THE NUMERICAL SIMULATION OF SHEET FORMING

This study is concerned with the problems of contact in the process of numerical simulation of sheet metal forming in rigid visco-plastic shell FEM. In respect of analysis of sheet deep drawing process,for the tool model described by triangular elements, a kind of contact judging algorithm about the correlation between the node of deformed mesh and the triangular element of a tool is presented. In SPF/DB Lagrangian multiplier method is adopted to solve the contact problem between deformed meshes, and a new reliable practical dynamic contact checking algorithm is presented. As computation examples, the simulation results of metal sheet deep drawing and SPF/DB are introduced in this paper.

真空成形制件厚度分布控制工艺的刚粘塑性壳有限元分析

本文作者以模拟粘塑性板壳成形过程为目的，开发了有限元软件ＡＲＶＩＰ－３Ｄ。本软件可以用于分析塑料的中空成形、压缩空气成形和真空成形等塑料板壳热成形问题。由于塑料压缩空气成形和真空成形过程是一种周边固定的正压吹塑或负压吸塑成形方法，所以成形零件厚度分布不均匀是非常显著的。本文着重介绍了本程序在塑料板材压缩空气成形和真空成形零件厚度分布控制过程中的应用，给出了盒形件的成形厚度分布控制工艺设计实例。