Abstract
To solve the fracture problem of pin round punch when stamping small holes on stainless steel sheets, the retaining structure was analyzed and the structure optimization design of pin round punch was presented. It is shown that during stamping stainless steel sheets, it can prevent pin punch from being fractured effectively by adopting clearance fit between pin punch and retainer plate, precise guide of stripper plate and making working part free in the stripper plate .The optimization results show that the B-type round punch is better than A-type in resisting fracture, and the resistance fracture capability of pin round punch is the best when the transition radius between guiding part and working part is R10mm. Aimed at pin punch damaged in biggish progressive dies, the quick replaced structure is designed, which can replace the pin punch in 3 minutes. So this type of structure can save time very much.
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