Transactions of Materials and Heat Treatment

Title：Influence of cavity pressure on box-shaped part with special-shaped long flanges in hydroforming process

Authors： Lang Lihui Zhang Wenshang Liu Kangning Yang Xiying Jia Xinqiang

Unit： Beihang University

KeyWords： hydroforming box-shaped part with special-shaped long flanges simulation cavity pressure pre-bulging

ClassificationCode：TG386

year,vol(issue):pagenumber：2016,41(9):41-45

Abstract：

Box-shaped part with special-shaped long flanges (BPSLF) is difficult to form and easy to

crack because the flange area is too large to make the materials in the flanges flow

difficultly. Compared simulation of wall thickness distribution with the experiment results,

the simulation agrees with the experimental results well. The influences of cavity pressure

and initial pre-bulging in the hydroforming of BPSLF were analyzed combining experiment result

with simulation result. The loading path of cavity pressure was optimized. The process window

about the pre-bulging pressure and pre-bulging height was built to guide the selection of pre

-bulging parameters of this kind of parts. The results show that when the pre-bulging pressure

and pre-bulging height is too small, the BPSLF will rupture at the round corner of punch.

While, the pre-bulging pressure and pre-bulging height are too large, the BPSLF will rupture

at die corner. With increasing forming pressure, the maximum thinning rate decreases at first

and then increases.

Funds：

国家科技重大专项（2014ZX04002-071）

郎利辉（1970-），男，博士，教授，博士生导师

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