Transactions of Materials and Heat Treatment

Title：Influence of feeding punch and back pressure on formability in hydroforming process for parallel double-branch tube

Authors： Tong Jianghuai Xiao Xiaoting Chen Mingtao Guo Heng Liu Qian

Unit： Guangdong University of Technology

KeyWords： feeding punch back pressure parallel doublebranch tube tube forming wall thickness thinning

ClassificationCode：TG394

year,vol(issue):pagenumber：2019,44(1):73-79

Abstract：

In order to investigate the effect of feeding punch and back pressure on the formability in the hydroforming process of parallel double-branch tube, the influences of feeding punch length and back pressure on the branch height and wall thickness of tube were analyzed by the finite element analysis and experiment. The results show that under the same loading path, with the increasing of feeding punch length, the branch height of tube increases by 10.52%, and the change rate of wall thickness thinning ratio in the top of tube branch is up to 23.2%. Therefore, the increasing of feeding punch length effectively improves the branch height of tube and reduce the wall thickness thinning ratio in the top of tube branch. And the back pressure effectively reduces the wall thickness thinning in the top of tube branch and improves the forming performance in the hydroforming process of parallel double-branch tube. Thus, based on the analysis results of finite element and experiment, the feeding punch and back pressure can effectively improve the forming performance of the parallel double-branch tube to a certain extent, and the finite element analysis results are in good agreement with the experiment results.

Funds：

佛山市科技创新专项资金项目（2013GQ100413）

童江槐（1991-），男，硕士研究生，E-mail：1171776461@qq.com；通讯作者：肖小亭（1957-），男，博士，教授，博士生导师，E-mail:xxting1@163.com

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