Several examples of failures of complicated cutting tools, such as hubs and broaches and coid heading and squeezing tools from real life auto production are given and analysed in this paper.

• 本文给出并分析了,在实际汽车生产中复杂刀具,如滚刀、拉刀等和冷镦、挤压工具失效的实例,并提出延长其寿命的措施。