The punch includes an end portion adapted to Pierce an entry hole and bend material around the entry hole to form a retained slug along an inner edge of the entry hole.
该冲头包括端部，该端部适于刺穿入口孔并折弯环绕该入口孔的材料，以沿着该入口孔的内缘形成残留的废料。
Panel will be formed when restrike if shape relief exsit by cam pierce . To be kept punch upper shape. (Same as bolting hole).
＊ 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).
＊ 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。
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