Transactions of Materials and Heat Treatment

Title：Bulging-pressing composite forming process for small fillet tube with rectangular section

Authors： Liu Zhiqiang Jin Shouyi Zhu Shiqiang Liu Gang

Unit： Harbin Institute of Technology China FAW Group Co. Ltd. Capital Aerospace Machinery Company

KeyWords： bulging-pressing composite forming small fillet forming tube with rectangular section wall thickness distribution process window

ClassificationCode：TG394.2

year,vol(issue):pagenumber：2021,46(4):44-49

Abstract：

For the rectangular section tube with high precision, small fillet radius and uniform thickness distribution, the traditional forming process is difficult to form the qualified parts. Therefore, the bulging-pressing composite forming process of tube with rectangular section and small fillet was studied by finite element simulation and experiment methods, and the influences of key parameters such as internal pressure and downward displacement of upper die on the fillet radius and wall thickness distribution of part were analyzed. The results show that increasing internal pressure and downward displacement of upper die are beneficial to the filling of fillet, and the relative fillet radius of rectangular component reaches 0.86 by appropriate internal pressure and downward displacement of upper die. Furthermore, different from the serious thinning of fillets and nearby areas in the traditional hydroforming, the fillets and nearby areas are thickened by the bulging-pressing composite forming process, which is beneficial to obtain the small fillet part with more uniform wall thickness. Thus, on the basis of the study of forming law, the forming process window of tube with rectangular section and small fillet is established, and the tube meeting the requirements of shape and size is formed.

Funds：

国家高层次人才特殊支持计划项目（W020239）

刘志强（1990-），男，博士研究生 E-mail：lzhq241@163.com 通讯作者：刘钢（1970-），男，博士，教授 E-mail：gliu@hit.edu.cn

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