US 12,233,445 B2
Press forming method
Ryo Ageba, Tokyo (JP)
Assigned to JFE STEEL CORPORATION, Tokyo (JP)
Appl. No. 17/926,015
Filed by JFE STEEL CORPORATION, Tokyo (JP)
PCT Filed Apr. 8, 2021, PCT No. PCT/JP2021/014847
§ 371(c)(1), (2) Date Nov. 17, 2022,
PCT Pub. No. WO2021/241024, PCT Pub. Date Dec. 2, 2021.
Claims priority of application No. 2020-090156 (JP), filed on May 23, 2020.
Prior Publication US 2023/0173566 A1, Jun. 8, 2023
Int. Cl. B21D 19/08 (2006.01); B21D 53/88 (2006.01)
CPC B21D 19/08 (2013.01) [B21D 53/88 (2013.01)] 3 Claims
OG exemplary drawing
 
1. A press forming method for forming a blank into a press forming part, the press forming part including: a top portion having an outer edge part including: a convex outer edge part protruding outward in an in-plane direction; a concave outer edge part recessed inward in the in-plane direction; and a connecting edge part connecting the convex outer edge part and the concave outer edge part continuous to each other; and a flange portion continuously formed on the outer edge part of the top portion, the press forming method comprising:
a first forming step of forming a preformed part, the preformed part including a first part of the flange portion formed in the convex outer edge part and including a torsional shape portion having a torsional shape toward the concave outer edge part so as to be formed in the connecting edge part continuous from the first part of the flange portion, the first part of the flange portion being a portion of occurrence of shrink flange forming; and
a second forming step of forming the preformed part formed in the first forming step into a target shape by forming the torsional shape portion into a second part of the flange portion and forming a third part of the flange portion in the concave outer edge part, the third part of the flange portion being a portion of occurrence of stretch flange forming.