... 针-平面[火花]隙：needle-plate gap 针孔状损坏：pinhole failure 针孔透镜：aperture lens ...
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Give some analyses to the failure forms of pinhole punch, bring forward several more ideal prevention measures, in order to improve usage life of a pinhole punch and quality of punching part.
对小孔凸模失效形式进行了分析，提出了几种较为理想的预防措施，以提高小孔凸模的使用寿命和冲压件质量。
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