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起皱和拉裂是印涂铝盖在冲压拉深过程中的两大主要缺陷,合适的压边力对防止起皱和拉裂具有十分重要的作用。实际中,通常采用理论计算和模具调试的方法来获得合适的压边力数值,但理论计算方法计算复杂、可操作性差,而模具调试繁琐且费时费工。针对这一问题,以非线性有限元分析软件Dynaform为平台,对印涂铝盖冲压拉深工艺过程和压边力进行数值模拟和理论分析,确定了压边力的合理范围,并根据压边力范围试冲产品以确定最佳压边力。结果表明,1716印涂铝盖首次拉深的压边力数值的合理范围为7~8.8 k N,最理想的压边力数值在8.8 k N附近。该方法减少了压边力调试的盲目性,缩短了模具调试时间,减少了模具调试难度,最终达到降低产品制造成本的目的。
Creping and cracking are the two main defects of stamping aluminum cover in the process of stamping and drawing. Appropriate blank holder force plays an important role in preventing wrinkling and cracking. In practice, the theoretical calculation and mold debugging are usually used to obtain the proper blank holder force. However, the theoretical calculation method is complicated and the operability is poor, and the mold debugging is complicated and time-consuming. In response to this problem, the non-linear finite element analysis software Dynaform is used as a platform to simulate and theoretically analyze the stamping process and the BHF of the printed aluminum cover. The reasonable range of the BHF is determined, Force range test product to determine the best blank holder. The results show that the reasonable range of blank holder force for the first drawing of 1716 printed aluminum cover is 7 ~ 8.8 kN and the optimum blank holder force is about 8.8 kN. The method reduces the blindness of the blank holder force debugging, shortens the debugging time of the mold, reduces the difficulty of mold debugging, and finally achieves the purpose of reducing the manufacturing cost of the product.