锻压技术

拉深筋对金属板材成形极限的影响

英文标题：Influence of drawbeads on forming limit for sheet metal

单位：1. 武汉纺织大学工业雷管智能装配湖北省工程研究中心 2. 华中科技大学材料成形与模具技术国家重点实验室

分类号：TG386.1

出版年,卷(期):页码：2021,46(9):184-189

摘要：

为了提高拉深成形数值模拟中破裂缺陷的预测精度，针对拉深成形工艺中拉深筋对金属板材成形性的影响展开了研究。设计加工了3种不同高度的凸筋镶块和3种不同肩圆角半径的凹筋镶块，将凸筋镶块与凹筋镶块组合出不同截面尺寸的拉深筋，然后并将金属板材拉过拉深筋，然后分析了过筋产生的预应变以及拉深筋的截面几何参数对板材成形极限的影响规律。结果表明，板材流过拉深筋后，板材的成形极限提高，成形极限曲线在应变空间中向上偏移。在任意一组拉深筋镶块的作用下，成形极限曲线的偏移量与过筋产生的预应变近似呈线性关系；在不同尺寸的拉深筋镶块产生相同大小的预应变时，成形极限曲线的偏移量随着拉深筋高度的增大而增大，随着肩圆角半径的增大而减小。

In order to increase the prediction accuracy of fracture defects during the numerical simulation of drawing, the influence of drawbead on the formability of sheet metal in the drawing process was studied. Three kinds of convex drawbead inserts with different heights and three kinds of concave drawbead inserts with different shoulder fillet radius were designed and manufactured. Then, the convex drawbead inserts and the concave drawbead inserts were combined to form drawbeads with different sectional dimensions, and the influence laws of pre-strain induced by passing through drawbeads and drawbead sectional geometry parameters on the sheet forming limit were analyzed by drawing the sheet metal through the drawbeads. The results show that after the sheet metal flows through the drawbead, the forming limit of sheet is improved, and the forming limit curve of sheet metal moves upwards in the strain space. Furthermore, under the effect of any set of drawbead inserts, the offset of the forming limit curve is approximately linearly related to the pre-strain induced by passing through drawbeads, and when the drawbead inserts with different dimensions produce the same pre-strain, the offset of the forming limit curve increases with the increasing of the drawbead height and decreases with the increasing of the shoulder filler radius.

基金项目：

国家自然科学基金资助项目（51805181）

李巧敏（1989-），女，博士，副教授 E-mail：qmli@wtu.edu.cn 通信作者：李红军（1974-），男，硕士，教授 E-mail：lihongjun@wtu.edu.cn

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