Accurate part finish blanking method and blanking mold thereof

摘要: The present invention discloses a fine punching method and die for precise parts, which are applicable cavity of the parts. adopts double method, pre-punches to make whose size is smaller than required part. And then second performed finish process punching. used in conjunction with method. Lower precision pre-punching die, while strict design small gap fillet die. has less impact punching, so obtained no taper bright belt rate close 100 per cent. Moreover, can protect reduce replacement frequency, thereby greatly decreasing costs.