中文摘要：

对比分析刚性压边和柔性压边两种不同工艺，探讨不同的成形工艺条件对起皱模拟、破裂以及成形极限的影响。用显式动力学商用软件LS～DYNA对两种厚度的马鞍型曲面件进行数值模拟。模拟结果表明，在刚性压边成形方式下，变形量较大时成形件起皱，压边力较大时成形件破裂；但在相同条件下，用柔性压边成形工艺的成形件结果良好，而且减小压边面的宽度到原来的1／2时，通过增加压边力的方法，还可获得良好的成形效果。柔性压边工艺可大大提高板料的利用率，改善板料的成形极限，减少各种不良缺陷发生。

英文摘要：

Different technologies about rigid blank-holder forming and flexible blank-holder forming are simulated, and the influence on wrinkle, crack and forming limit from the two different technologies is also analyzed. Furthermore this process is numerically simulated by explicit software LS-DYNA for U-shaped parts with two kinds of thickness. The results show that in the rigid blank-holder forming, the formed part will wrinkle when the deformation is great, and will rupture when the blank-holder force is great. But under the same condition, by using the flexible blank-holder forming technology, the formed part is good, moreover, when the width of blank-holder surface is reduced to 1/2 of the original one. Good forming result can be obtained by increasing the blank-holder force. The flexible blank-holding technology can greatly increase the utilization efficiency of sheet metal, improve the forming limit sheet metal, and avoid various defects.