Transactions of Materials and Heat Treatment

Title：Influence of cavity pressure loading path on hydroforming for 5A06 aluminum alloy conical cups

Authors： Xu Yongchao1 2 Han Siyu1 2 Liu Shengjing3

Unit： 1.School of Materials Science and Engineering Harbin Institute of Technology 2.National Key Laboratory of Precision Hot Forming Process of Metals Harbin Institute of Technology 3.China Aviation Manufacturing Technology Research Institute

KeyWords： aluminum alloy conical cup hydroforming wall thickness distribution forming limit of deep drawing

ClassificationCode：TG394

year,vol(issue):pagenumber：2022,47(12):38-43

Abstract：

In order to improve the forming limit of deep drawing for 5A06 aluminum alloy conical cup, the hydroforming of conical cup was investigated by the method of combining numerical simulation and experiment, and the formation mechanism of defects in the hydroforming process for conical cups with different cone angles and the influence laws of process parameters were analyzed. Then, the typical defect in the forming of conical cups was the wrinkling of suspending zone, the influences of different cavity pressure loading paths on the typical defect of 5A06 aluminum alloy conical cups with the cone angles of 5°, 10°, 15° and 20° were analyzed. Furthermore, the loading path to avoid defects and the distribution laws of wall thickness for conical cups with different cone angles were obtained, and the forming limits of deep drawing for conical cups with different cone angles were determined by the experiments. The results show that with the increasing of cone angle for conical cups, the suspended area of cone surface increases, the slope of the cavity pressure loading path in the first stage of the hydroforming process decreases, which can avoid the cracking defect caused by overcoming wrinkling in the suspended area. The larger the cone angle is, the larger the thinning rate of wall thickness for conical cups is, and the smaller the forming limit of deep drawing is.

Funds：

国家自然科学基金资助项目（51375114）

徐永超（1974-），男，博士，教授 E-mail：yongchaoxu@hit.edu.cn

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