Transactions of Materials and Heat Treatment

Title：Optimization of hot upsetting forming parameters of A286 superalloy hexagonal headed bolt head for high-speed train

Authors： Pan Peng Li Yi Li Jiachun Wu Bing Zhong Haotian

Unit： Guizhou University China Aviation Industry Standard Parts Manufacturing Co. Ltd.

KeyWords： A286 superalloy hexagon headed bolt head forming hot upsetting orthogonal experiment multi-objective optimization

ClassificationCode：TG316.1

year,vol(issue):pagenumber：2020,45(3):62-69

Abstract：

In order to improve the qualification rate of hot upsetting forming process for hexagonal headed bolt head, the orthogonal experiment was designed by selecting three factors，namely heating temperature, hot upsetting speed and friction coefficient，which have great influence on the forming quality. The thermo-mechanical coupled numerical model of hot upsetting process was established by using finite element analysis software Deform-3D. By means of numerical simulation, the equivalent stress, the equivalent strain, the damage value and the forming load of billet after hot upsetting were analyzed by multi-objective optimization method. The technological parameters of hot upsetting forming for A286 superalloy hexagonal headed bolt head were optimized. The numerical simulation results show that, compared with the original scheme of manufacturer, when the technological parameters are optimized as the heating temperature of 1050 ℃, the hot upsetting speed of 60 mm·s-1 and the friction coefficient of 0.3, the target parameters are improved, and the qualified rate and production efficiency of workpiece can be greatly improved. The production test was carried out with the optimized combination of hot upsetting process parameters. The results show that the forming effect of bolt head is good and meets the quality requirements of the process. The research provides a theoretical basis for actual production.

Funds：

贵州省科技计划项目（黔科合支撑［2018］2168）；贵州省科技计划项目（黔科合成果［2019］4412）

潘鹏（1994-），男，硕士研究生 E-mail：1654045723@qq.com 通讯作者：李屹（1973-），女，博士，教授 E-mail：liyikk@163.com

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