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

Claim 0:
1. A method for manufacturing a press-formed article, comprising:
a first step of forming, from a sheet-shaped workpiece having one or more of first edge portion and one or more of second edge portion extending in a direction intersecting the first edge portion and is connected to the first edge portion, a base sheet portion, one or more of first rising portion rising from the base sheet portion on a side of the first edge portion via a first ridge line and extending to the second edge portion, and a first strip portion extending on a side opposite to the base sheet portion via a second ridge line extending to the second edge portion along an upper edge portion of the first rising portion;
a second step of forming one or more of second rising portion which rises between a first lower die and a second upper die as a whole on the same side as the first rising portion and connected to the first rising portion via a vertical ridge line by causing a strip-shaped first zone including the base sheet portion, the first rising portion, and the second edge portion of the first strip portion to be disposed between a first upper die and the first lower die from both sides along the second edge portion, causing a second zone adjacent to the first zone and including the base sheet portion, the first rising portion, and the first strip portion to be disposed between the second upper die and a second lower die from both sides, and moving the first upper die and the first lower die relative to the second upper die and the second lower die toward a side at which the first rising portion rises with respect to the base sheet portion,
wherein, in the second step, a portion of the second rising portion connected to the vertical ridge line is shear-deformed; and
a third step of increasing a rising height of the first rising portion by causing the first strip portion side of the workpiece which has been subjected to the second step to be disposed between a third upper die and a third lower die using the first ridge line as a boundary, causing the base sheet portion side to be disposed between a fourth upper die and a fourth lower die, and moving the third upper die and the third lower die relative to the fourth upper die and the fourth lower die,
wherein, in the third step, shear deformation is caused in a zone of the second rising portion adjacent to the first strip portion and adjacent to a zone in which the shear deformation has been caused in the second step in a direction along the second edge portion.