Transactions of Materials and Heat Treatment

Title：Influence of key process parameters on thin-wall tube workpiece in hydroforming process

Authors： Lang Lihui Zhang Quanda Sun Zhiying Wang Yao

Unit： Beihang University

KeyWords： initial reverse bulging numerical simulation cavity pressure loading paths hydroforming fluctuation

ClassificationCode：TG386.3

year,vol(issue):pagenumber：2017,42(12):51-60

Abstract：

In order to research the influence of initial reverse bulging height(IRBH), reverse bulging pressure(IRBP) and cavity pressure loading paths on the hydroforming process of sheet, for the stainless steel 321, an analysis of the hydroforming process of sheet metal was carried out. Firstly, the influences of the IRBH,IRBP and the cavity pressure loading paths on the forming of part were studied by the method of numerical simulation and based on the hydroforming with initial reverse bulging(IRB). Secondly, the hydroforming processes with and without IRB were discussed. At last, they were confirmed by the experiment. The results show that when the IRBH is 3.75 mm and the IRBP is 2 MPa, the maximum thinning rate of sheet is 4.803% in the end of hydroforming process which is the smallest value in all the results. While the hydroforming process is without IRB, the maximum thinning rate is 5%. However, when the cavity pressure increases continual during the later stage of hydro-mechanical deep drawing, the bottom of sheet metal is fluctuating and there is a double-dip deformation on the sheet metal. At the same time, the maximum thinning rate of sheet increases. Thus, it is verified that the maximum thinning rate of wall thickness decreases effectively adpting appropriate IRBH and IRBP, but when the cavity pressure loading path is different, the distribution of wall thickness is different too.

Funds：

国家科技重大专项：“高档数控机床与基础制造装备”（2014ZX04002-071）

作者简介：郎利辉（1970-），男，博士，教授 E-mail：Lang@buaa.edu.cn 通讯作者：张泉达（1986-），男，博士研究生 E-mail:zhangquandadgu@163.com

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