Patent ID: 11925968
Assignee: NIPPON STEEL CORPORATION
Field: Machine tools (Mechanical engineering)
Classification: CPC B  H | IPC B  H

Claim 7:
8. The method for manufacturing the press-formed article according to claim 1, wherein, in the second step, surface pressure of causing the workpiece to be disposed between the first upper die and the first lower die and surface pressure for causing the workpiece to be disposed between the second upper die and the second lower die are obtained on the basis of Expression (1):

P=Y/590×t/1.4×P0  (1)

where, P: surface pressure (MPa) for causing workpiece to be disposed therebetween
Y: tensile strength (MPa) of workpiece
t: thickness (mm) of workpiece
P0: reference surface pressure=0.1 MPa.