Transactions of Materials and Heat Treatment

Title：Optimization on structural parameters of mandrel for TA1 titanium alloy internal thread pipe based on response surface

Authors： Li Huajie1 Li Xudong1 Xiong Zhen1 Zhang Zhenghao1 Huang Dongnan1 2

Unit： 1.College of Materials Science and Engineering Inner Mongolia University of Technology 2.Aluminum Corporation of China Limited

KeyWords： internal thread pipe mandrel extrusion response surface method particle swarm algorithm

ClassificationCode：TG379

year,vol(issue):pagenumber：2022,47(9):126-134

Abstract：

In order to obtain the optimal structural parameters of mandrel, taking thread length L, thread lift angle φ1 and attack angle of mandrel φ2 as the design variables, and taking velocity relative difference VRD1 of material head tooth in thread pipe, velocity relative difference VRD2 of pipe wall and maximum load F of extrusion forming as the optimization target parameters, the multi-response regression model was established. Then, the established multi-response regression model was globally optimized by particle swarm algorithm, and the optimal parameters of internal thread pipe mandrel were finally obtained as the thread length L=11 mm, the thread lift angle φ1=30°, and the attack angle of mandrel φ2=96°. Furthermore, after optimization, VRD1 was reduced by 50.38%, VRD2 was reduced by 44.81%, and F value was decreased by 5.10%. Finally, the mold was processed by the optimal structure parameters of mandrel, and the extrusion test was conducted to obtain the qualified TA1 titanium alloy internal thread pipe. The results show that the mandrel structure optimized by the response surface method can improve the fluidity of metal in the extrusion process, reduce the maximum forming load of mold, and improve the forming quality of internal thread pipe.

Funds：

国家自然科学基金地区科学基金资助项目（5186050063）

黎华杰（1996-），男，硕士研究生 E-mail：1679860680@qq.com 通信作者：黄东男（1979-），男，博士，教授 E-mail：huangdongnan@cmari.com

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