Transactions of Materials and Heat Treatment

Title：Numerical simulation research on bend-bulge forming of thin-walled elbow with small bending radius

Authors： Lang Lihui Luo Xuan Cheng Pengzhi Zi Yan Zhou Yong Wang Tao Wu Hai

Unit： Beihang University AVIC Shenyang Liming Aero-Engine (Group) Co. Ltd. Shanghai Huizhong Automotive Manufacturing Co. Ltd.

KeyWords： thin-walled elbow with small bending radius CNC bending hydroforming bend-bulge forming numerical simulation

ClassificationCode：TG394

year,vol(issue):pagenumber：2014,39(12):45-52

Abstract：

A Bend-bulge Forming (BBF) process was put forward for elbow parts with relative bending radius r/D≤1 and relative wall thickness t/D≤0.05, which cannot be formed directly with available technologies. BBF combining CNC bending technology and hydroforming technology realizes the forming of thin-walled elbows with small bending radius which eliminates welding lines of traditional half-pipe butt welding process. The feasibility of BBF and selection of key parameters were studied by the numerical simulation of overall process and orthogonal experiment method. The research results show that CNC bending technology is a rapid and stable way for preforming. At the same time, hydroforming technology increases the forming limitation of parts effectively, and BBF is a good method to manufacture thin-walled elbows with small bending radius.

Funds：

国家自然科学基金资助项目（1175024）

郎利辉（1970-），男，博士，教授;通讯作者：罗璇（1990-），男，硕士

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