Transactions of Materials and Heat Treatment

Title：Control on defects in rubber bladder forming for reinforced inner skin with large-size and multiple surrounds

Authors： Bai Ying Zhong Lixin Wang Wei Zhang Li Qiu Xi

Unit： AVIC Xi’an Aircraft Industry Group Company Ltd.

KeyWords： rubber bladder forming reinforced inner skin strengthening rib forming pressure supporting pressure plate

ClassificationCode：TG386

year,vol(issue):pagenumber：2021,46(11):168-175

Abstract：

For the problems that the depth of strengthening rib for reinforced inner skin with large-size and multiple surrounds exceeded the one-time tensile deformation limit of aluminum alloy material, the forming stress of multi-rib structure could not be released and the springback after forming was too large, by the simulation software PAMSTAMP, a finite element model was established to numerically analyze the defects of wrinkles and ruptures of the blanks with different structures during the rubber bladder forming, and the influence laws of multiple surrounds and deep rib structure for part on the material flow during the rubber bladder forming were studied. Then, it was found that the material thickness reduction rate of the first-pass rubber bladder forming could be effectively controlled by adding the supporting pressure plate auxiliary device, and the parameters of blank, die structure and blank holder force were optimized, which was verified by experiments. The results demonstrate that the inner skin processing method of multi-pass rubber bladder forming with flexible support reduces the single deformation limit of thin-walled deep rib structure and improves the height limit of deep cavity structure in the traditional rubber bladder forming, and the bottleneck problems, such as tedious process, long period, serious wrinkling and poor surface quality of pressure drop forming, are solved successfully.

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作者简介：白颖（1972-），女，学士，研究员级高工，E-mail：baiyingsyh@163.com

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