Transactions of Materials and Heat Treatment

Title：Research on stretch bending process of 7A09 aluminum profile with large cross-sectional area

Authors： Wang Yanqin Liu Jingping Ma Kai Wang Yue Wang Dong

Unit： Tianjin Long March Launch Vehicle Manufacturing Co. Ltd. Capital Aerospace Machinery Company

KeyWords： 7A09 aluminum profile stretch bending springback pre-stretching force post-stretching value

ClassificationCode：TH162

year,vol(issue):pagenumber：2015,40(2):76-78

Abstract：

Aluminum extrusion with large or complex cross-sectional area is widely used in new aerospace launch vehicle. The process of stretch bending for large cross-sectional area with a bending diameter of 5 m was discussed. According to the analysis on influences of lubrication, pre-stretching force and post-stretching on springback, a set of optimum technologic parameters was established, namely 450 kN pre-stretching force, 72° pre-stretching angle, 500 kN post-stretching force, 82° post-stretching angle and 50 mm post-stretching value. The experiments show that the springback of the part end is 2.5-3 mm, so the technologic parameters can be adopted. The aluminum extrusion with large cross-sectional area and bending diameter is obtained and satisfies the requirements of the products.

Funds：

国家自然科学基金资助项目(51275130)

王妍琴（1987-），女，硕士，助理工程师

Reference：

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