Micro deep drawing of C1100 conical-cylindrical cups

Micro deep drawing was prompted by the rapid development of micro electro mechanical systems, electron industries, new energy, and biomedical in recent years because of its mass production, high efficiency, high precision, low cost and no pollution. However, most researches concentrated on micro cylindrical cups, few studies were reported on other shaped parts. Micro deep drawing of micro conical-cylindrical cups was investigated in this study by using a micro blanking-deep drawing multiple operation mould. The specimen material was pure copper C1100 with a thikness 50 mu m which was thermaly treated in vacuum condition at 723 K for 1 h. Micro deep drawing experiments were carried out at room temperature on a universal testing machine at a drawing velocity of 0.05 mm/s with the lubrication of polyethylene (PE) film. The results showed that micro conical-cylindrical cups with internal conical bottom diameter of only 0.4 mm were well formed. The drawing force and limiting drawing ratio(LDR) micro conical-cylindrical cups were also discussed at the end of this paper. (C) 2014 The Authors. Published by Elsevier Ltd.