中文摘要：

利用扫描电镜对精冲凸模的断口进行微观分析,借助有限元软件对模具进行计算,得到凸模上的应力分布情况。结果表明：凸模根部为脆性疲劳断裂,螺纹孔处的应力集中导致该螺钉固定式凸模发生断裂。

英文摘要：

SEM was used to analyze the fracture of a fine-blanking punch and finite element software to predict the stress distribution of the punch.Investigation shows that the rupture in the punch root is brittle fatigue fracture which is due to the stress concentration at the threaded hole.