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

Claim 11:
12. A press-forming apparatus, comprising:
a first lower die including a first bottom surface, a first wall surface rising from the first bottom surface, and a first flange surface extending from an upper edge of the first wall surface toward a side opposite to the first bottom surface;
a first upper die formed in a shape corresponding to the first lower die and having a workpiece disposed between the first upper die and the first lower die;
a second lower die comprising a second bottom surface, a second wall surface rising from the second bottom surface, and a second flange surface extending from an upper edge of the second wall surface toward a side opposite to the second bottom surface and disposed adjacent to the first lower die;
a second upper die formed in a shape corresponding to the second lower die and having the workpiece disposed between the second upper die and the second lower die; and
a drive portion configured to move the second upper die and the second lower die relative to the first upper die and the first lower die from the first upper die side toward the first lower die side in a state in which an interval between the first upper die and the second upper die and an interval between the first lower die and the second lower die are maintained,
wherein the first lower die comprises a lower end die comprising at least the first wall surface and the first flange surface and a lower center die having an interval with respect to the lower end die and holding a portion of the workpiece opposite to the first flange surface with respect to the first wall surface,
the first upper die includes an upper end die corresponding to the lower end die of the first lower die and an upper center die corresponding to the lower center die of the first lower die, and
the drive portion moves the lower end die and the upper end die to become closer to the lower center die and the upper center die with respect to the first lower die and the first upper die, respectively, as the second upper die and the second lower die are moved relative to the first upper die and the first lower die.