Transactions of Materials and Heat Treatment

Title：Hot extrusion forming process of pipe with tail cushion

Authors： Cheng Yiming Tuo Leifeng Zhou Genshu Kang Xitang Li Qiang

Unit： Stainless Steel Tube Branch Company Taiyuan Iron & Steel (Group) Co. Ltd. Xi′an Jiaotong University

KeyWords： stainless steel 316L molybdenum alloy hot extrusion tail cushion surplus metal

ClassificationCode：TG376.2

year,vol(issue):pagenumber：2017,42(10):69-72

Abstract：

In order to solve the difficulty of separation process for pipe surplus metal and improve the utilization rate of pipe products, the hot extrusion forming process with tail cushion was researched. Taking stainless steel 316L as tail cushion and molybdenum alloy as extrusion billet, the extrusion model with tail cushion was established by software CAXA, four matching modes were designed, and the metal flow characteristic, extrusion force curve and stress distribution in extrusion process under four matching modes were simulated and analyzed by software DEFORM2D. The simulation results show that the surplus metal and pipe can separate automatically when the inner hole of tail cushion is small or equal to that of extrusion billet, and the surplus metal and pipe can not separate automatically when the inner hole of tail cushion is larger than that of extrusion billet which need to be separated by hot sawing. Therefore, the dimension stability in tail part of the conical surface matching method is better than that of other three matching modes. At last, the molybdenum pipe hot extrusion process is applied in sputtering target of liquid crystal displays, and the automatic separation of surplus metal and pipe is verified when the inner hole sizes of tail cushion and billet are equal.

Funds：

国家自然科学基金青年科学基金资助项目(51305228)

作者简介：程逸明（1984-），男，硕士，工程师，E-mail：chengyim@126.com；通讯作者：拓雷锋（1984-)，男，博士研究生，工程师，E-mail：tuoleifeng1984@sjtu.edu.cn

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