Process Parameters Analyses on Stainless Steel Circle Cup by Micro Drawing Process

摘要

This study used a micro drawing to determine the effects of die angle (alpha=-15 degrees similar to 15 degrees) on the formability of micro circle cups. A program for finite element analysis of incremental elastic-plasticity deformation is developed by combining the flow rule of Prandtl-Reuss with finite element deformation theory and the stress-strain relation of correction materials. The program is then used to simulate the circle cup micro drawing process. The program uses general r(min) algorithm to solve problems of elastic-plasticity status and die contact. Simulations performed using the finite element analysis program acquire the relations among deformation, punch load, stroke, thickness distribution, stress, and strain distribution during the circle cup micro drawing process, which indicate the changes in the forming process. The simulation was consistent with experimental results, i.e., easily-cracked areas in the micro circle cup forming process appear on the punch fillet.