1.  punching
2.  piercing

• 1. 冲孔: punching | punched hole | pierce | punching
• 2. 冲孔模: pierce die | piercing dies | punching die | perforating die
• 3. 冲孔机: punching machine | punch machine | eyelet machine

更多释义

• 1.最有可能的是所谓冲孔云。
  Most likely it was what is known as a hole-punch cloud.
  dict.yoduao.com
• 2.因此在一个操作中，如钻或冲孔操作先定位在加工。
  Thus in an operation such as drilling or punching, the positioning and cutting take place sequentially.
  dict.yoduao.com
• 3.刀口模切割线间的间隙最小，冲孔模修整时的分布宽度也很小，这些都是要注意的。
  The gap between the minimum cutting edge cutting, trimming punching die when the distribution width is small, these are to be noticed.
  dict.yoduao.com

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