US 12,030,105 B2
Structural member, structural member manufacturing method, and structural member manufacturing device
Satoshi Shirakami, Tokyo (JP); Yasuharu Tanaka, Tokyo (JP); Koichi Sato, Tokyo (JP); Shigeru Yonemura, Tokyo (JP); and Tohru Yoshida, Tokyo (JP)
Assigned to NIPPON STEEL CORPORATION, Tokyo (JP)
Appl. No. 17/762,806
Filed by NIPPON STEEL CORPORATION, Tokyo (JP)
PCT Filed Sep. 25, 2020, PCT No. PCT/JP2020/036314
§ 371(c)(1), (2) Date Mar. 23, 2022,
PCT Pub. No. WO2021/060483, PCT Pub. Date Apr. 1, 2021.
Claims priority of application No. 2019-174595 (JP), filed on Sep. 25, 2019.
Prior Publication US 2022/0331855 A1, Oct. 20, 2022
Int. Cl. B21D 47/00 (2006.01); B21D 22/22 (2006.01); B21D 22/26 (2006.01); B21D 37/08 (2006.01); B60J 5/04 (2006.01); E04C 3/04 (2006.01); B21D 37/10 (2006.01)
CPC B21D 47/00 (2013.01) [B21D 22/22 (2013.01); B21D 22/26 (2013.01); B21D 37/08 (2013.01); E04C 3/04 (2013.01); B21D 37/10 (2013.01); B60J 5/0444 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A structural member made of a metal material sheet, and comprising:
a first region extending to intersect with a third direction among a first direction, a second direction, and the third direction that are orthogonal to each other;
a first ridge connected to the first region and extending in the second direction;
an inclined portion connected to the first region through the first ridge in the first direction and inclined with respect to the first region;
a second ridge formed at an end portion of the inclined portion on a side opposite to the first region in the first direction and extending along the second direction; and
a second region connected through the second ridge and extending to intersect with the third direction,
wherein in the inclined portion,
an intersection angle with the third direction in a first plane that is defined by the first direction and the third direction changes according to a position in the second direction, and
an intersection angle with the first direction in a second plane that is defined by the first direction and the second direction changes according to a position in the second direction,
the inclined portion includes
a pair of second inclined portions, each of which is located on each side of both end portion sides in the second direction,
a pair of third inclined portions, each of which is connected to each of the pair of second inclined portions, and
a first inclined portion which is connected to both of the pair of third inclined portions,
an intersection angle with the third direction of each of the pair of third inclined portions is in a range between an intersection angle with the third direction of the first inclined portion and an intersection angle with the third direction of each of the pair of second inclined portions,
the first ridge has a convex shape whose center portion protrudes in a direction of the first region,
the second ridge has a convex shape whose center portion protrudes to a side opposite to the second region, and
a maximum sheet thickness region portion having a maximum sheet thickness on the first inclined portion side, and a minimum sheet thickness region portion formed on the second inclined portion side with respect to the maximum sheet thickness region portion and having a minimum sheet thickness are formed, and a sheet thickness ratio A of the minimum sheet thickness region portion to the maximum sheet thickness region portion, which is obtained by the following Expression 1, satisfies the following Expression 2,
the sheet thickness ratio A=([maximum sheet thickness (mm) of the maximum sheet thickness region portion]−[minimum sheet thickness (mm) of the minimum sheet thickness region portion])/[maximum sheet thickness (mm) in the maximum sheet thickness region portion]   Expression 1
0.08≤A≤0.26  Expression 2.