To provide a metal piece working device of excellent productivity which can corrugate a metal piece with high accuracy.
This method piece working device provides a plurality of pieces of uneven corrugation on the metal piece and comprises a common lower die 1 having a final corrugation surface W corresponding to the plurality of pieces of uneven corrugation, and a plurality of upper dies 2... in which the number of pieces of uneven corrugation is successively increased from a surface V1 with a small number of pieces of corrugation on which a small number of pieces of uneven corrugation are formed to a final corrugation surface V2 corresponding to the plurality of pieces of uneven corrugation. The metal piece is pressed by the common lower die and the upper dies 2 by successively and automatically changing the upper dies from the upper die 2 having the surface with a small number of pieces of corrugation to the upper die 2 having the final corrugation surface.
KITANI SHINICHI
TOGAWA OSAMU
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