Finite-element analysis of metal flow in bearing section during extrusion process of rectangular and angle sections -combination of three-dimensional FE simulation and extrusion die design-1 -

摘要

This paper presents a rigid-plastic FEM code and describes its application to metal flow simulation during extrusion aiming to gain a deeper knowledge and information to eliminate geometrical defects of products. The effects of some variables such as friction coefficient, aspect ratio of extrudate's cross section, bearing land length and position of die opening on metal flow are studied. Results on the average extrusion pressure and metal flow characteristics in terms of velocity distributionprofiles in the bearing section and streamlines are presented. From these results, it is possible to predict geometric defects of products and find out the method to reduce them by modification of the die geometry, i.e., bearing length and position of die opening. The extrusion simulation of rectangular and angle sections is conducted to illustrate the applicability of the developed code.