我厂生产的如图1所示的垫圈,材料是普通的10号钢,料厚为0.5毫米。未改设计前模具结构如图2,冲裁间隙均为0.02毫米,一九八一年七月按上述结构制造了三套模具。一共仅只冲压了一万三千多件,都由于凸凹模破裂而报废。模具寿命为什么这样低,经分析认为:单从凸凹模的壁厚差与零件厚度之 I produced the factory shown in Figure 1 washers, the material is ordinary steel No. 10, material thickness of 0.5 mm. No change before the design of the mold structure shown in Figure 2, blanking gaps are 0.02 mm, July 1981 according to the above structure to create three sets of mold. Only a total of more than 13,000 pieces were punched, all of which were scrapped due to bump-breaking. Die life is so low, the analysis shows that: the punch from the wall thickness of poor and part thickness