Device for manufacturing laminated iron core and method for manufacturing laminated iron core

A device for manufacturing a laminated iron core by punching out a plurality of punched members from a metal sheet and laminating the plurality of punched members while being rotated, the plurality of punched members having an annular shape and having M number of protrusions provided on an inner peripheral edge or an outer peripheral edge of the plurality of punched members, the M being a natural number of 1 or more, the device comprising:

• a punch unit configured to form the protrusions, and including punches in an amount of N number as a set, the N being the natural number larger than the M;
• auxiliary punches in the amount of N number,
• wherein the N number of auxiliary punches are configured such that L number of auxiliary punches selected from the N number of auxiliary punches performs a nullification processing on the metal sheet, the nullification processing being configured to nullify a processing with the L number of punches among the N number of punches, the L being the natural number that is obtained by subtracting the M from the N;
• and
• a blanking punch that punches the metal sheet without punching the formed protrusions to perform a blanking process on the inner peripheral edge or the outer peripheral edge of the plurality of punched members.