公开(公告)号：US10118212B2

公开(公告)日：2018-11-06

申请号：US15058469

申请日：2016-03-02

Applicant: MITSUI HIGH-TEC, INC.

Inventor： Shinichiro Ono ,  Masahiro Izumi ,  Shigetoshi Yamato

IPC: B21D28/26 ,  H01F41/02 ,  H02K15/02 ,  H02K1/18 ,  H02K15/09 ,  H02K15/095

Abstract: A method for forming a blanked piece from a material, where the blanked piece includes a production area having a through hole and at least one caulking and connection area protruding inside the through hole. The method includes forming a blanking hole in the material in a prescribed outline, placing a guide member in the through hole, where the guide member has an abutting part contacting a protrusion of the material formed along the outline of the blanking hole. The method further includes cutting and separating the material to blank or stamp out downward the caulking and connection area, pushing back the caulking and connection area, and temporarily connecting the caulking and connection area to the material; and blanking or stamping an outer configuration of the product area from the material to which the caulking and connection area is temporarily connected.

公开(公告)号：US09887038B2

公开(公告)日：2018-02-06

申请号：US14574844

申请日：2014-12-18

Applicant: MITSUI HIGH-TEC, INC.

Inventor： Shigetoshi Yamato

IPC: H01F41/02 ,  H02K15/02 ,  B21D28/22

CPC classification number: H01F41/0233 ,  B21D28/22 ,  H02K15/024 ,  Y10T29/49078 ,  Y10T29/5142

Abstract: A blanking die apparatus includes a lower die in which a plurality of working stations are arranged, and an upper the which moves upward and downward with respect to the lower die. A progressively fed sheet is sequentially blanked or stamped out respectively in the working stations to form iron core pieces, and then to laminate the iron core pieces to form a laminated iron core. The lower die includes a lifter part which lifts the sheet from the lower die when the sheet is progressively fed. The lifter part first lifters installed in an outer peripheral area in each of the working stations, and second lifters installed on an upper surface of a blank die which has a blanking hole formed for blanking the iron core pieces in an external form, or on an upper surface of a blank die holder.