基于分区压边技术的铝合金方盒形件拉深技术研究

Research on deep drawing process of aluminum alloy drawn box based on segment blank holder technique

  • 摘要: 提出了一种适用于盒型件等非轴对称结构的径向分区压边方法,可对法兰不同径向区域独立加载压边力。首先,采用理论方法建立了法兰区皱纹模型,并推导出相对于传统压边方法,新方法只需要更小的压边力即可以抑制起皱,初步验证了径向分区压边方法的理论可行性。然后,采用有限元方法对成形效果进行了数值模拟。结果表明,径向分块压边圈对控制材料的流动更有效,可有效地抑制起皱并且提高成形极限。最后进行了板材拉深成形实验。同样施加5.9 kN的压边力,径向分区压边方法作用下的盒型件具有更好的成形效果,验证了所提出的新压边方法用于板材成形是切实可行的。

     

    Abstract: A radial segmented blank holder technique for drawn box is proposed, which can realize independent loading of blank holder force along the different radial zones. Firstly, the wrinkling model on the flange is established by theoretical derivation. The wrinkles can be suppressed with a smaller blank holder force compared with the conventional blank holder method which preliminarily proves the theoretical feasibility of the new blank holder method. Then, the numerical forming simulations are carried out by using the finite element method. The results show that the radially segmented blank holder can effectively control the material flow, suppress wrinkling and improve the forming limit. Finally, the deep drawing experiment is carried out. With the same blank holder force of 5.9 kN, the drawn box under the action of the new blank holder method has better forming quality, which verifies that the radial segmented blank holder technique is feasible for sheet metal forming.

     

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