Wrinkling usually happens in the punching process of curved surface sheet metal.

曲面板件在冲压成形时常常发生起皱现象。

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The punching process of the lead frame was analyzed, the multi-position progressive die was designed.

分析了引线框的冲压工艺性，设计出了多工位级进模。

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Through analyzing the punching process for the supporting pipe, introduced various processing characteristics.

通过对支撑管零件冲孔工艺进行了分析，介绍了各种加工工艺的特点。

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That way, consumers don't have to go through the process of punching in their credit-card information.

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