A Investigation of the Forming Limit of SUS304 Stainless Sheet and a Study of the Simulation of the Conical Cup by Hydraulic Deep Drawing

• Main Authors: Chih-Wei Chang, 張誌偉
• Other Authors: Te-Fu Hwang
• Format: Others
• Language: zh-TW
• Published: 2015
• Online Access: http://ndltd.ncl.edu.tw/handle/t4wque

碩士 === 國立高雄應用科技大學 === 模具工程系 === 103 === For the purpose of stimulated the process of making a conical cup using the hy-draulic deep drawing technique, this study used a SUS304 stainless steel plate of 1mm thickness to conduct tensile test to determine its material properties. A Forming Limit Diagram (FLD) was obtained through limiting dome height test (LDH) and optical measuring systems. In order to verify the forming limits of SUS304 stainless steel, fi-nite-element analyzing software was used to stimulate the strain path of the forming process under LDH. It was found that the strain path from the simulation matched closely with the FLD obtained from experiment, and therefore it will give us a good basis for the limits of SUS304 stainless steel plate hydraulic deep drawing before the plate gets damaged. The FLD of the SUS304 stainless steel obtained was applied to the simulation of the hydraulic deep drawing of the conical cup to investigate the effects of stress paths, punch cone angle, punch fillet, punch friction, blank diameter and other parameters on the forming process. From the results we found that pre-bulging height can increase the thickness distribution at the base of the cup. When the slope and the pressure is too small there is a relatively large thinning rate on the edges of the cone. When there is a large amount of friction on the punch, the conical cup will have an even distribution of thickness. When the punch cone angle is large, the chances of breakage of the cup fillet are reduced. When the blank diameter is large, instead of aiding with thickness distribution it actually causes breakage of the conical cup.