Transactions of Materials and Heat Treatment

Title：Influence of pressure parameters for hydroforming on forming of complex thin-walled aluminum alloy pipe with variable section

Authors： Zhang Yanfeng Lang Lihui Zeng Yipan Men Xiangnan Sun Guichuan Zhang Sanmin

Unit： Beihang University Tianjin Tianduan Press Co. Ltd. Tianjin Tianduan Aviation Technology Co. Ltd. AVIC Chengdu Aircraft Industrial (Group) Co. Ltd.

KeyWords： variable section pipe hydroforming aluminum alloy internal pressure loading numerical simulation

ClassificationCode：TG394

year,vol(issue):pagenumber：2021,46(4):89-95

Abstract：

The complex thin-walled aluminum alloy pipes with variable section are an important part of aircraft pipeline. Based on the finite element analysis software, the finite element model of part in hydroforming was established, and the same aluminum alloy parts were formed by the single factor analysis method under the same condition of giving axial feeding amount, friction coefficient and final forming pressure. Then, the influences of different loading pressures on the final forming effect of parts were studied by comprehensively analyzing the relative position of pipe billet and die and the distribution law of wall thickness when the different low-pressure pre-forming pressures were loaded in the pre-forming stage and the different feeding pressures were loaded in the feeding stage. Furthermore, on the basis of finite element simulation, the instability phenomena such as wrinkles and cracks of parts during the process test were analyzed, and the processes at different stages was optimized. Finally, the optimal low-pressure pre-forming pressure and the optimal feeding pressure of part were 4 MPa and 14 MPa respectively. Thus, according to the optimized parameters, the qualified parts were finally produced, which verified the feasibility of optimized parameters.

Funds：

国家自然科学基金资助项目（51675029）

张艳峰（1987-），男，博士研究生，副高级工程师 E-mail：18622709176@163.com 作者简介：郎利辉（1970-），男，博士，教授 E-mail：lang@buaa.edu.cn

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