冲孔凸模磨损是模具失效的主要形式之一。
The wear of piercing punch is one of main die lose efficacy.
介绍了钢管热冲孔凸模硫氮碳共渗工艺试验。
The test of sulphurized tufftride process for treating the hot piercing punch for steel pipes is introduced.
＊ 整形时，如果同时存在斜楔冲孔，因凸模表面逃料制件将发生变形（螺钉孔同样）。 凸模表面逃料要避免。
Panel will be formed when restrike if shape relief exsit by cam pierce . To be kept punch upper shape. (Same as bolting hole).
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