ECAE Processed Copper for Backward Extrusion of Micro Cups

• Main Authors: Teng-Chiao Wang, 王騰鉸
• Other Authors: Chao-Cheng Chang
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/08887592413589058797

碩士 === 國立高雄應用科技大學 === 模具工程系碩士班 === 96 === This paper describes a micro backward extrusion process of cups using the fine-grained copper produced by equal channel angular extrusion (ECAE). Copper was first annealed, deformed by multi-pass ECAE at room temperature and heat treated to obtain a microstructure with a grain size of about 2 microns. Microstructure was carefully examined and some mechanical properties including hardness and stress-strain relationship were also investigated. The results show that the hardness of copper was increased after the ECAE. Moreover, the ECAE processed copper has larger total strain than those from the annealed copper in the simple upsetting test. The fine-grained copper obtained by the ECAE was used in a micro backward extrusion process to produce the cups with the inner diameter of 3 mm and the wall thickness of 0.1 mm. A commercial package was also employed to simulate the process and the predicted shapes of cups were close to those from experiments. It was concluded that the ECAE processed copper provides better formability and edge quality in the micro backward extrusion of cups.