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| Application of Hydroforming Technology in Aerospace Rocket Fairing Forming |
| YANG Shengwei1 , YU Hongzhe1 , ZHANG Chun2 , LI Jiguang3 , TIAN Shu3 , LANG Lihui4 , NING Jun5 |
| (1. Tianduan Aviation Technology Co., Ltd., Tianjin 300232, China; 2. TianjinTianduan Press Co., Ltd., Tianjin 300232, China; 3. Tianjin Long March Launch Vehicle Manufacturing Co., Ltd., Tianjin 300462, China; 4. Beihang University, Beijing 100191, China; 5. AECC Shenyang Liming Aero-engine Co., Ltd., Shenyang 110043, China） |
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Abstract Aiming at the hydroforming process of large-scale thin-walled fairing, wrinkle-free and crack-free parts were obtained by numerical simulation. The numerical simulation results were in good agreement with the experimental results, and the accuracy and applicability of numerical simulation were verified. Through field tests, the formation mechanism and control mode of defects were studied. The wrinkling and cracking defects in hydroforming process were solved by loading curve of blank holder force, controlling initial chamber pressure and blank holder force. The process upgrading of liquid-filled deep drawing on large-scale thin-walled fairing components is realized, the product profile accuracy is greatly improved, the manual dressing and annealing processes in the later stage of down-pressing forming are eliminated, and the product quality and production efficiency are guaranteed.
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2020, 
