Method for forming blanked piece and manufacturing method of laminated body and laminated iron core using blanked piece formed by method for forming blanked piece

A method for forming a blanked piece from a material, the blanked piece including a product area having a through hole in a central side and at least one caulking and connection area protruding inside the through hole of the product area, wherein a part of the caulking and connection area is fitted to a fitting part of the product area formed in an edge part of the through hole of the product area to temporarily connect the caulking and connection area to the product area, the method comprising:

• forming a blanking hole in the material, the blanking hole having a same outline as a configuration that combines an outline of a part of an inner periphery of the through hole from which an opening area of the fitting part is excluded with an outline of a part of the caulking and connection area protruding inside the through hole;
• placing a guide member in the blanking hole, the guide member having an abutting part which comes into contact with a tip end of a protrusion of the material formed along the outline of the blanking hole;
• cutting and separating the material along an outline of the fitting part by blanking or stamping out downward the caulking and connection area into an accommodation part that receives the caulking and connection area during the blanking or stamping out operation;
• providing a knockout punch abutting on a lower surface of the caulking and connection area;
• pushing back the caulking and connection area by lifting the knockout punch after the downward motion of the blanking or stamping out operation is finished, to position the caulking and connection area in between the fitting part and the abutting part of the guide member, and temporarily connecting the caulking and connection area to the material of the product area;
• and
• blanking or stamping an outer configuration of the product area from the material to which the caulking and connection area is temporarily connected.