图1是我厂的两种铜制产品,在它们的侧壁上都有两个相对的长圆孔。为了冲制这对孔,我们采用了无凹模冲孔的方法,效果良好。模具结构如图2所示。除模柄1和底板9之外,上下模的固定板、凸模、导向结构、弹压板等都相同,不同之处就是在下弹压板6上装有定位装 Figure 1 shows two copper products from our factory with two opposite oblong holes in their side walls. In order to punch the holes, we used a non-punch method, the effect is good. Mold structure shown in Figure 2. In addition to the mold handle 1 and the bottom plate 9, the upper and lower die fixed plate, punch, guide structure, the pressure plate and so on are the same, the difference is in the lower elastic plate 6 is equipped with positioning device