Inner wrinkling control in hydrodynamic deep drawing of an irregular surface part using drawbeads
Inner wrinkling control in hydrodynamic deep drawing of an irregular surface part using drawbeads
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DOI：
10.1016/j.cja.2014.04.015
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发表时间：
2014-06
影响因子：
5.7
通讯作者：
B. Meng;M. Wan;X. D. Wu;Sheng Yuan;Xudong Xu;Jie Liu
中科院分区：
文献类型：
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作者：
B. Meng;M. Wan;X. D. Wu;Sheng Yuan;Xudong Xu;Jie Liu
复杂形状零件的充液拉深成形对变形顺序的控制要求较高，容易产生内毛刺现象。针对复杂曲面零件内翻边的控制问题，提出了一种以改变材料流动为目标的拉延筋参数优化设计方法。通过对内翻边形成机理的理论分析，认为单纯优化型腔压力是不合理的，不能形成无翻边的拉深件，因此采用半圆形拉深筋。讨论了拉延筋的布置方式和高度对成形效果的影响，并以抗皱系数和最小壁厚为评价指标建立了工艺窗口。通过实验验证了工艺窗口的有效性，并对壁厚和起皱高度进行了测量，并与数值计算结果进行了比较。结果表明：拉延筋的抗起皱能力随倾斜角度和距凹模中心距离的增大而减弱，壁厚随倾斜角度和距凹模中心距离的增大而增大;在I区和II区布置具有最佳穿透深度的拉延筋可以完全抑制内起皱。
Inner wrinkling phenomenon is more likely to develop during hydrodynamic deep drawing (HDD) of complicated component-forms due to the higher demand for controlling deformation sequences. Aiming at the problems in control of inner wrinkling for an irregular surface part featured with both concavity and convex, this research proposes an optimal design method of drawbead parameters to change the material flow. According to theoretical analysis of the mechanism of inner wrinkling, optimizing cavity pressure only is unreasonable to form a wrinkle-free deep-drawn part, so semi-circular drawbeads are employed. The effects of layout and height of drawbeads on forming results are discussed, and a process window is established based on evaluation indicators including the anti-wrinkle coefficient and the minimum wall thickness. Experiments are carried out to validate the process window, and the wall thickness and the wrinkle height are measured and compared with numerical findings. The results show that the anti-wrinkle ability of drawbeads weakens with increasing oblique angle and distance from the die center, while the wall thickness increases with increasing oblique angle and distance, and the inner wrinkling can be completely suppressed by drawbeads arranged in zones I and II with optimum penetration.