冲孔：指工件由普通冲床和模具加工孔的工艺过程。
Piercing: refer to artifacts from the ordinary hole punch and mold machining process.
本文叙述了RT——300数控冲床加工圆形孔时模具的选择，并画出了圆模具选择流程图。
This paper narrates the mould selection when processing holes by RT-300 data punch press and gives the flow diagrams.
由于该产品图所要求的孔距零件的边缘有较大的距离，其尺寸超出冲床的喉深，这就限制了采用冲床冲压。
Because the distances between the hole and the edge needed by product drawing are so bigger that exceed the punch confine.
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