我厂生产的S×250五吨越野车上的进气管凸缘形状如图1。其材料为20号钢,料厚为12毫米。采用工艺1)落料,2)冲四孔两道工序。原设计的冲孔模具因采用的是普通冲孔结构,尽管凸模采用了Cr12MoV合金工具钢材料,但在生产中仍有小孔严重变形和凸模经常折断现象。现对该件的冲裁过程作一分析。 I plant the S × 250 five-ton SUV intake pipe flange shape shown in Figure 1. The material is 20 steel, material thickness of 12 mm. Using process 1) blanking, 2) punch four holes two processes. The original design of punching die due to the use of the ordinary punching structure, although the punch with Cr12MoV alloy tool steel material, but there are still serious holes in the production of deformation and punch frequently broken phenomenon. Now the piece of blanking process for an analysis.