公开(公告)号：US20200230682A1

公开(公告)日：2020-07-23

申请号：US16815095

申请日：2020-03-11

Applicant: NIPPON STEEL CORPORATION

Inventor： Takashi MATSUNO ,  Akira Egami

IPC: B21D28/16 ,  B21D28/14 ,  B21D28/34

Abstract: A sheet-shaped blank (10) for press forming is produced by shearing a metal sheet (30). The blank (10) includes a sheared edge (14), which includes a sheared surface (14b) and a fractured surface (14c) in the sheet thickness direction and has a loop shape in plan view. In plan view, an edge of the sheared edge (14) includes concavely curved portions (20). The average of lengths of the fractured surface (14c) in the sheet thickness direction in the curved portions (20) is greater than the average of lengths of the fractured surface (14c) in the sheet thickness direction over the entire perimeter of the sheared edge (14).

公开(公告)号：US20240238862A1

公开(公告)日：2024-07-18

申请号：US18422091

申请日：2024-01-25

Applicant: NIPPON STEEL CORPORATION

Inventor： Takashi MATSUNO ,  Akira EGAMI

IPC: B21D28/16 ,  B21D28/14 ,  B21D28/34 ,  B26F1/14 ,  B21D28/26

CPC classification number: B21D28/16 ,  B21D28/14 ,  B21D28/34 ,  B26F1/14 ,  B21D28/26

Abstract: A sheet-shaped blank (10) for press forming is produced by shearing a metal sheet (30). The blank (10) includes a sheared edge (14), which includes a sheared surface (14b) and a fractured surface (14c) in the sheet thickness direction and has a loop shape in plan view. In plan view, an edge of the sheared edge (14) includes concavely curved portions (20). The average of lengths of the fractured surface (14c) in the sheet thickness direction in the curved portions (20) is greater than the average of lengths of the fractured surface (14c) in the sheet thickness direction over the entire perimeter of the sheared edge (14).