To obtain a product having sufficient precision by punching out a part of the product to a plate material with a die and a punch having non- punch-out shape at a part and executing perfect punch-out with punch-out shape die and punch into the product from the plate material.
The plate material 54 is interposed with the die 56 supported with a die plate 55 and a holding plate 58 supported with a cushion material 57 and sheared into a semi-product 70 with a main punch 62 under condition of holding the product part with a counter punch 60 in a first step working device 54. Successively, connecting parts 68a and 68b of the semi-product 70 are sheared with a main punch corresponding to the shape of a piece member of the product to form the piece members in a second step working device. Since the piece member is surely sheared with the working device 52 to an engaging part needing the precision and an inclining surfaces at both side surface parts in foot part, the precision can sufficiently be obtained.
KONNO YUICHI
KOBAYASHI MAKOTO
