Piercing: refer to artifacts from the ordinary hole punch and mold machining process.

冲孔：指工件由普通冲床和模具加工孔的工艺过程。

youdao

Piercing: refer to artifacts from the ordinary hole punch and mold machining process.

冲孔：指工件由普通冲床和模具加工孔的工艺过程。

youdao