Transactions of Materials and Heat Treatment

Title：Hydro-bending of asymmetric 5083 aluminum alloy bent tube with large diameter-thickness ratio

Authors： Wang Xiaosong Liu Junqi Fu Mengchun Zhao Jie Qin Zhonghuan Li Baoyong Liu Gang

Unit： Harbin Institute of Technology Aerospace Long March Launch Vehicle Technology Co. Ltd. Beijing Hangxing Machinery Manufacturing Co. Ltd.

KeyWords： 5083 aluminum alloy tube hydro-bending large diameter thin-walled tube large diameter-thickness ratio wrinkle

ClassificationCode：TG306

year,vol(issue):pagenumber：2021,46(4):36-43

Abstract：

For the wrinkle problem of asymmetric aluminum alloy thin-walled bent tube with large-size and large diameter-thickness ratio during the bending process, three kinds of hydro-bending schemes were proposed, which were restrained only by pressing plates at both ends of tube, fixed restraint at both ends of tube and closure head used at both ends of tube. Then, the wrinkle defects, wall thickness distribution and stress state of tube were analyzed by finite element numerical simulation, and the verified experiments were carried out. The results show that when the restraint at both ends of tube by pressing plates is used, the axial tensile stress of tube provided by friction between pressure plate and tube is small, and only when the internal pressure is greater than 3.6 MPa, the wrinkle defect can be eliminated. When the fixed restraint and closure head are adopted at both ends of tube, the qualified asymmetric aluminum alloy bent tubes with large diameter-thickness ratio are formed under a lower internal pressure, and the reason is that the axial restraint and the closure head produce axial tensile stress in the tube to balance the inner axial compressive stress generated during the bending process. Thus, the wrinkling defects are avoided.

Funds：

国家自然科学基金资助项目（51975147）

王小松（1977-），男，博士，副教授 E-mail：hitxswang@hit.edu.cn 通讯作者：刘钢（1970-），男，博士，教授 E-mail：gliu@hit.edu.cn

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