进给冲头与背压对并列双支管液压成形性能的影响  

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

作　　者：童江槐 肖小亭[1] 陈名涛[1] 郭衡 刘倩 Tong Jianghuai;Xiao Xiaoting;Chen Mingtao;Guo Heng;Liu Qian(School of Material and Energy,Guangdong University of Technology,Guangzhou 510006,China)

机构地区：[1]广东工业大学材料与能源学院,广东广州510006

出　　处：《锻压技术》2019年第1期73-79,共7页Forging & Stamping Technology

基　　金：佛山市科技创新专项资金项目(2013GQ100413)

摘　　要：为探究进给冲头与背压对并列双支管液压成形性能的影响,通过有限元分析与实验相结合的方法,对比分析了进给冲头长度与背压对管材支管高度与壁厚的影响。结果表明:在加载路径相同的条件下,随进给冲头长度增大,管材支管高度提高10. 52%,管材支管顶部壁厚减薄率变化率为23. 2%,因此,进给冲头长度增加有效提高了管材支管高度,减小了支管顶部壁厚减薄率;背压在并列双支管成形过程中有效减缓了管材支管顶部的壁厚减薄,有效提高了管材的成形性能。对此,通过有限元结果与实验结果分析发现,进给冲头与背压在一定程度上可有效改善并列双支管的成形性能,并且有限元分析结果与实验结果一致。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.

关 键 词：进给冲头 背压 并列双支管 管材成形 壁厚减薄 

分 类 号：TG394[金属学及工艺—金属压力加工]