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| Accuracy Control of Pulse Current Assisted Hot Pressing Forming for Titanium Alloy Sheet Metal Parts |
| XUE Jie, LI Baoyong, QIN Zhonghuan, LIU Yuping, WANG Zhanqi, FAN Jiangling |
| (Beijing Hangxing Technology Development Co., Ltd., Beijing 100013, China) |
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Abstract A pulse current assisted hot pressing forming is designed to solve the problem of low accuracy of cold forming and high cost of heat forming machine. In this paper, the influence of pulse current assisted hot pressing process on defects, dimensional accuracy and mechanical property of TC1 titanium alloy U-shaped parts was studied. The results show that the pulse current heating can improve the forming efficiency. When the pulse current density is 9.2A /mm2 and the closing speed is 15mm/s, the heat loss in the forming process is compensated, the titanium alloy sheet metal parts are kept in a good forming temperature range and the forming limit is increased. During the forming process, with the rise of forming pressure, holding time and mould preheating temperature, the dimensional accuracy of the parts is gradually improved. When the shape pressure is 10t, holding time is 10s and the mould is not preheated, the dimensional accuracy of the parts reaches ±0.2mm. The grain size of the part after pulse current assisted hot pressing is smaller than that of the hot forming machine, and the mechanical property is better.
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2020, 
