Electric hot incremental forming of Ti-6Al-4V titanium sheet
Electric hot incremental forming of Ti-6Al-4V titanium sheet
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DOI：
10.1007/s00170-009-2472-2
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发表时间：
2010-08-01
影响因子：
3.4
通讯作者：
Tong, Guoquan
中科院分区：
文献类型：
--
作者：
Fan, Guoqiang;Sun, Fengtao;Tong, Guoquan
金属板料电热渐进成形是一种可行且易于控制的难成形金属板料成形新技术。本课题针对航空航天工业中广泛应用的Ti-6Al-4V钛合金板材进行研究。虽然Ti-6Al-4V钛合金可以在高温下良好成形，但表面质量是一个问题。为了提高表面质量，选择合适的润滑剂是非常重要的。同时，由于Ti-6Al-4V钛具有活泼的化学性质，因此选择加工温度范围对于获得优异的塑性和防止氧化非常重要。在加工过程中选用各种润滑剂进行效果比较，并对部分工件在不同温度下进行成形，找出最佳成形温度。结果表明，在Ti-6Al-4V钛合金工件上，采用镍基MoS2自润滑材料的润滑膜，可获得高表面质量的复合涂层;对于1.0mm厚的Ti-6Al-4V钛合金板材，复合涂层的最佳厚度为20 μ m。事实上，润滑膜也确实有助于防止Ti-6Al-4V钛板的氧化。Ti-6Al-4V微氧化成形的适宜温度范围为500-600 ℃，在此温度范围内成形的最大拉深角为72 °。
Electric hot incremental forming of metal sheet is a new technique that is feasible and easy to control to form hard-to-form sheet metals. In the present study, Ti-6Al-4V titanium sheet was studied because it was wildly used in the aeronautics and astronautics industries. Although Ti-6Al-4V titanium can be well-formed in high temperature, the surface quality is a problem. In order to enhance the surface quality, it is very important to select the proper lubricant. At the same time, because Ti-6Al-4V titanium has a lively chemical property, it is very important to choose a processing temperature range in order to acquire excellent plastic property and to prevent oxidation. Various lubricants were selected in processing to compare the effect, and some workpieces were formed at different temperatures to find the best forming temperature. The results show that using the lubricant film of nickel matrix with MoS2 self-lubricating material, Ti-6Al-4V titanium workpiece was formed with high surface quality, and the optimum thickness of composite coating is 20 mu m for Ti-6Al-4V titanium sheet of 1.0-mm thickness. In fact, the lubricant film also does help to prevent oxidation of Ti-6Al-4V titanium sheet. The appropriate temperature range of Ti-6Al-4V forming with slightly oxidized is 500-600A degrees C in processing, and the maximum draw angle formed in this range was 72A degrees.