Transactions of Materials and Heat Treatment

Title：Axial low pressure forming process for aluminum alloy Ω-shaped bellows

Authors： Wang Biao Sun Lei Lin Caiyuan Chu Guannan Li Jiguang Hu Deyou

Unit： Harbin Institute of Technology（Weihai） Harbin Institute of Technology-Weihai Innovation Park Co. Ltd. Tianjin Aerospace Long March Rocket Manufacturing Co. Ltd.

KeyWords： bellows axial low pressure forming aluminum alloy loading path internal pressure axial feeding

ClassificationCode：TG39

year,vol(issue):pagenumber：2021,46(4):56-62

Abstract：

In order to obtain the aluminum alloy Ω-shaped bellows with large diameter, large expansion rate and small wall thickness thinning value, an axial low pressure forming process was proposed, and the core idea was to improve the forming quality of bellows by reasonably matching the relationship between internal pressure and axial feeding. At the same time, the finite element model of bellows in axial low pressure forming process was established by the combination of experiment and numerical simulation analysis and based on the finite element analysis software ABAQUS. And based on the equivalent stress and the wall thickness distribution in axial low pressure forming process of bellows, the influences of three different loading paths on the forming process of bellows were analyzed to obtain the optimal marching relationship between internal pressure and axial feeding. The results show that the shape accuracy of bellows obtained by the stepped matching relationship of path 3 is high, and the maximum thinning rate is 12.1%, which verifies the feasibility of process

Funds：

国家基金委航天联合基金重点项目(U1937205)；国家自然科学基金面上项目(51475121)；山东省重大科技创新工程（2019TSLH0103）

王彪(1997-)，男，硕士研究生 E-mail：zhinan_w@163.com 通讯作者：初冠南(1979- )，男，博士，教授 E-mail：chuguannan@hit.edu.cn

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