锻压技术

液室压力加载路径对5A06铝合金锥形件充液拉深成形的影响

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

作者：徐永超1 2 韩思雨1 2 刘胜京3

单位：1.哈尔滨工业大学材料科学与工程学院 2.哈尔滨工业大学金属精密热加工重点实验室

分类号：TG394

出版年,卷(期):页码：2022,47(12):38-43

摘要：

为提高5A06铝合金锥形件的拉深成形极限，采用数值模拟与实验相结合的方法进行了锥形件充液拉深成形的研究，分析了不同锥角的锥形件充液拉深变形过程中的缺陷形成机制及工艺参数的影响规律。锥形件成形的典型缺陷为悬空区起皱，分析了不同液室压力加载路径对锥角分别为5°、10°、15°及20°的5A06铝合金锥形件的典型缺陷的影响，获得了避免缺陷的加载路径以及不同锥角的锥形件的壁厚分布规律，实验确定了不同锥角的锥形件的拉深成形极限。结果表明：随着锥形件锥角的增大，锥面悬空区增大，充液拉深成形过程中的第1阶段液室压力加载路径的斜率减小，可避免为克服悬空区起皱而导致的破裂缺陷；锥角越大，锥形件壁厚减薄率越大，拉深成形极限越小。

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.

基金项目：

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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