Transactions of Materials and Heat Treatment

Title：Effect of process parameters on springback of bilayered 304 stainless steel bellows in hydroforming

Authors： Liu Jing Wang Youlong Li Lanyun Li Xiao

Unit： Xi′an Shiyou University Northwestern Polytechnical University AerosunTola Expansion Joint Co. Ltd.

KeyWords： bi layered bellow hydroforming 304 stainless steel springback behavior numerical simulation

ClassificationCode：TG386.43

year,vol(issue):pagenumber：2017,42(6):71-76

Abstract：

There is a significant influence of process parameters on the springback of bilayered 304 stainless steel bellows in hydroforming. To improve the forming quality, the hydroforming process and springback process of bilayered bellows were numerically simulated by ABAQUS platform, and the influences of internal pressure, die stroke and feeding rate on changes of bellow length, wave height and wave thickness after springback were investigated. The results show that with the increase of internal pressure and die stroke,the changes of bellow length, wave height and wave thickness increase linearly, and the changes of bellow length and wave thickness are larger than that of wave height. Furthermore, the influence of internal pressure on springback is larger than that of die stroke, and the sensitivity of springback on process parameters increases with the increase of expansion ratio. For bellow with expansion ratio of 1.47, the changes of bellow length, wave height and wave thickness increase by 119%, 175% and 167% respectively when the internal pressure increases up to 150%. While the die stroke increases up to 20%, they increase by 26%, 18% and 29% respectively.

Funds：

国家自然科学基金资助项目（51405386）；陕西省自然科学基础研究计划项目(2014JQ7237)；陕西省教育厅专项科研计划项目(14JK1565)；凝固技术国家重点实验室（西北工业大学）开放课题 (SKLSP201403)；西安石油大学青年科研创新团队资助项目(2015QNKYCXTD02)

刘静（1983-），女，博士，讲师

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