Transactions of Materials and Heat Treatment

Title：Forming process of rotary skin with curved generatrix for TC4 titanium alloy

Authors： Zhu Shiqiang Wang Dagang Wang Xinyu Zhang Sicong Wang Hailun Li Weihong Liu Kai

Unit： Capital Aerospace Machinery Corporation Limited

KeyWords： TC4 titanium alloy rotary body with curved generatrix skin thermoforming stress relaxation thermal sizing

ClassificationCode：V461

year,vol(issue):pagenumber：2020,45(6):107-110

Abstract：

For the rotary skin with curved generatrix in aerospace, the technological scheme of first split thermoforming and then thermal sizing was developed by analyzing the skin structure, and the temperatures of thermoforming and thermal sizing were selected as 700 ℃. Then, based on the analysis and calculation of the linear expansion coefficient of material, the design dimensions of the thermoforming and thermal sizing dies were obtained respectively, and the forming process parameters were optimized by the thermoforming and thermal sizing experiments. The results show that when the heat and pressure holding time during the thermoforming is 1000 s, the gap between the arc of formed part and the template is less than 0.3 mm, which meets the subsequent welding needs. Furthermore, the comparison test results of different preloads and heat holding times show that the die applies a certain preload to the product during the thermal sizing process, and after thermal sizing of 30 min, the dimensional accuracy of the manufactured skin product reaches ±0.3 mm, which proves the feasibility of this process.

Funds：

中国运载火箭技术研究院工艺改进基金（GYGJ14-211-30）

祝世强（1978-），男，硕士，高级工程师 E-mail：hitzsq@126.com 通讯作者：王大刚（1987-），男，硕士，工程师 E-mail：wdgnba@163.com

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