探讨了带凸台零件用模冲的设计。指出该模冲设计的关键问题是模冲凹槽的自锁角和形状问题。本文推导出自锁角公式ｔｇα＝Ｂ，并给出铁铜基两种材料的压坯、整形坯和浸油后的整形坯的静摩擦系数，为模冲凹槽的设计提供了方便 The design of blanking with bosses was discussed. It is pointed out that the key issue of die design is the self-locking angle and shape of the die punch. In this paper, the self-locking angle formula tgα = B is deduced, and the static friction coefficient of the green compacts, the green compacts and the billet after oil immersion are given, which is convenient for the design of the impulse groove