Transactions of Materials and Heat Treatment

Title：Influence of tube blank structure on inner bulging and cold push-bending for thin-wall elbow with small radius

Authors： Fu Chunlin Wang Wanshan Xu Xuefeng

Unit： Northeastern University Nanchang Hangkong University

KeyWords： small bending radius inner bulging and cold pushbending compensation angle inner wrinkling numerical simulation

ClassificationCode：TG376

year,vol(issue):pagenumber：2019,44(1):80-85

Abstract：

For the forming of Φ40 mm×1 mm aluminum alloy L-shape bending tube which the bending radius is one times the tube diameter, based on the numerical simulation software, the finite element model of inner bulging and cold push-bending was established, and the influences of different compensation angles of blank ends on the tube forming quality were studied. The results show that the wrinkling in the inner side of bending tube can be easily produced when the compensation angle is oversize，and a smaller compensation angle can effectively prevent the bending tube from producing wrinkles. Furthermore, with the decreasing of angle, the thinning area of the formed tube continues to expand, and the effective length of the inner side of bending tube is continuously reduced to cause insufficient forming easily. However, the wrinkling disappears when the compensation angle is 45°，the maximum reduction ratio of the outer wall thickness is 7.1%，and the overall forming quality is better. Finally, the inner bulging and cold push-bending experiment was conducted based on the 45°compensation of angle， and the tubes with bending radius of one times the tube diameter that met the requirements were formed. The experiment results is coincident with the simulated results.

Funds：

国家自然科学基金资助项目（51405219）；中航工业产学研项目（BA201306321）

付春林(1974-),男，博士研究生，讲师，E-mail：forestneu@126.com；通作作者：王宛山（1946-），男，硕士，教授，博士生导师，E-mail：wws@neu.edu.cn

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