It is pointed that application and dissemination's key factor of piston pin's cold extruding technique in China is that working life of piston pin's cold extruding punch is too low.
明确指出妨碍活塞销冷挤压技术在国内推广应用的关键因素是其冷挤压凸模的寿命太短。
2
To low drawing in flange part, the blank holder can be used as punch, and the effect is good.
对于凸缘部位的浅拉深，采用压边圈兼作浅拉深凸模的作用，取得较好的效果。
3
Try to punch it low or hit another lob towards the backhand.