Progressive die machine and method for manufacturing laminated iron cores by using same

A progressive die machine including an upper die assembly provided with a plurality of punches for blanking lamination sheets into a prescribed shape from a strip of sheet material that is conveyed in an intermittent manner and a lower die assembly provided with dies for cooperating with the punches, the progressive die machine comprising:

• a pilot hole punch for punching a pilot hole in the strip for a positioning of the strip;
• a provisional blanking punch for provisionally blanking each lamination sheet from the strip formed with the pilot hole without completely separating the lamination sheet from the strip;
• a counter punch provided in the lower die assembly and configured to press the lamination sheet against the provisional blanking punch when provisionally blanking the lamination sheet;
• a stripper plate for separating the strip from the provisional blanking punch after provisionally blanking the lamination sheet;
• and
• a full blanking punch for completely separating the lamination sheet that has been provisionally blanked from the strip;
• wherein at least a part of the stripper plate associated with the provisional blanking is not in contact with the strip, and at least a part of an outer peripheral part of the provisionally blanked lamination sheet is formed with a connecting portion connected to the strip.