To provide a plate working method and a punch press easily replacing a tap and easily executing continuous tapping work when the tap is broken in the punch press having a tapping work function.
In the plate working method and the punch press repeating to subject a product portion cut and separated from a workpiece to tapping work by a tapping work device and working a plurality of the product portions on the workpiece, when breakage of the tap T is detected in tapping work, all of the product portions S including the broken tap T or the periphery of a portion including the broken tap T is cut by molds P, D provided in the punch press or a laser working machine combinedly provided in the punch press, the broken tap T is removed from the workpiece W, and tapping work of a different product portion S is continued using a different tap instead of the broken tap T.
Iwa Saki Kokuni
Masakazu Ito
Shunichi Takahashi
Toshio Takamatsu