US 12,109,600 B2
Press forming method
Satoshi Sumikawa, Tokyo (JP)
Assigned to JFE STEEL CORPORATION, Tokyo (JP)
Appl. No. 17/602,093
Filed by JFE STEEL CORPORATION, Tokyo (JP)
PCT Filed Dec. 27, 2019, PCT No. PCT/JP2019/051362
§ 371(c)(1), (2) Date Oct. 7, 2021,
PCT Pub. No. WO2020/217593, PCT Pub. Date Oct. 29, 2020.
Claims priority of application No. 2019-080657 (JP), filed on Apr. 22, 2019.
Prior Publication US 2022/0143672 A1, May 12, 2022
Int. Cl. B21D 22/26 (2006.01); B21D 53/88 (2006.01); B29C 43/02 (2006.01)
CPC B21D 22/26 (2013.01) [B21D 53/88 (2013.01); B29C 43/02 (2013.01)] 2 Claims
OG exemplary drawing
 
1. A press forming method of forming a press-formed product including: a web portion; a side wall portion continuous from the web portion; a flange portion continuous from the side wall portion; and a convex curved portion in which the web portion and/or the flange portion is convexly curved in a height direction along a longitudinal direction in side view, wherein a center of a convexly curved arc is located on the flange portion side in side view, the press forming method comprising:
a first forming process of press-forming a blank into a preformed part in which a portion corresponding to a web, and a portion corresponding to a side wall including a twisted side wall portion of a twisted shape along the longitudinal direction, are formed, the preformed part including a portion corresponding to a convex curve; and
a second forming process of press-forming the preformed part into the press-formed product,
wherein the twisted side wall portion of the preformed part press-formed by the first forming process is twisted such that an angle between the twisted side wall portion and the portion corresponding to the web is larger on an end portion side than at a center of the portion corresponding to the convex curve in the longitudinal direction, the angle being measured from below the portion corresponding to the web.