US 12,233,444 B2
Press forming tool and press forming method
Ryo Ageba, Tokyo (JP)
Assigned to JFE STEEL CORPORATION, Tokyo (JP)
Appl. No. 17/925,961
Filed by JFE STEEL CORPORATION, Tokyo (JP)
PCT Filed Apr. 8, 2021, PCT No. PCT/JP2021/014848
§ 371(c)(1), (2) Date Nov. 17, 2022,
PCT Pub. No. WO2021/241025, PCT Pub. Date Dec. 2, 2021.
Claims priority of application No. 2020-090158 (JP), filed on May 23, 2020.
Prior Publication US 2023/0182189 A1, Jun. 15, 2023
Int. Cl. B21D 19/08 (2006.01); B21D 22/26 (2006.01); B21D 24/00 (2006.01); B21D 53/88 (2006.01)
CPC B21D 19/08 (2013.01) [B21D 22/26 (2013.01); B21D 24/005 (2013.01); B21D 53/88 (2013.01)] 2 Claims
OG exemplary drawing
 
1. A press forming tool for forming a press forming part, the press forming part including: a top portion having a convex and concave outer edge part in which a convex outer edge part protruding outward in an in-plane direction and a concave outer edge part recessed inward in the in-plane direction are continuous to each other via a connecting outer edge part; and a flange portion continuously formed in the convex and concave outer edge part of the top portion, the press forming tool comprising:
an upper die and a lower die to be used for bend-forming of the flange portion along the convex and concave outer edge part; and
a lower pad and an upper pad configured to sandwich a blank in cooperation with the upper die and the lower die, wherein
the upper die includes:
a convex outer edge flange forming portion configured to form the flange portion in the convex outer edge part;
a concave outer edge flange forming portion configured to form the flange portion in the concave outer edge part; and
a connecting outer edge flange forming portion configured to form the flange portion in the connecting outer edge part, the convex outer edge flange forming portion protruding in a press forming direction from the concave outer edge flange forming portion, with the connecting outer edge flange forming portion inclined from the convex outer edge flange forming portion toward the concave outer edge flange forming portion,
the lower pad has a shape corresponding to each of the convex outer edge flange forming portion, the concave outer edge flange forming portion, and the connecting outer edge flange forming portion formed in the upper die, and
press forming is performed such that
during an initial stage of forming, the flange portion is formed on the convex outer edge part by the convex outer edge flange forming portion, and a torsional shape portion having a torsional shape toward the concave outer edge part is formed continuously from the flange portion by the connecting outer edge flange forming portion, and
during a late stage of forming, the torsional shape portion is formed into the flange portion by the connecting outer edge flange forming portion, and the flange portion is formed in the concave outer edge part by the concave outer edge flange forming portion so as to achieve formation of a target shape.