US 12,214,399 B2
Method for manufacturing pressed component, and shape correction die
Hiroto Miyake, Tokyo (JP); Toyohisa Shinmiya, Tokyo (JP); and Yuji Yamasaki, Tokyo (JP)
Assigned to JFE STEEL CORPORATION, Tokyo (JP)
Appl. No. 17/611,854
Filed by JFE STEEL CORPORATION, Tokyo (JP)
PCT Filed Feb. 14, 2020, PCT No. PCT/JP2020/005850
§ 371(c)(1), (2) Date Nov. 16, 2021,
PCT Pub. No. WO2020/235152, PCT Pub. Date Nov. 26, 2020.
Claims priority of application No. 2019-094834 (JP), filed on May 20, 2019.
Prior Publication US 2022/0212243 A1, Jul. 7, 2022
Int. Cl. B21D 22/26 (2006.01); B21D 22/24 (2006.01); B21D 31/00 (2006.01); B21D 37/10 (2006.01)
CPC B21D 22/26 (2013.01) [B21D 22/24 (2013.01); B21D 31/005 (2013.01); B21D 37/10 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A method for manufacturing a pressed component in which a metal sheet is press-formed in a component shape that has a hat-shaped cross-sectional shape and has a curved part that is curved to be convex toward one side of a top sheet part in a width direction when viewed in plan view along a longitudinal direction of the top sheet part, the hat-shaped cross-sectional shape having continuous vertical wall parts on both sides of the top sheet part in the width direction via a bent part, to manufacture a formed product, the method comprising:
a first step of press forming the metal sheet in the component shape using a first die, wherein the component shape of the formed product after release from the first die is defined as a first component shape, and
a second step of press forming the formed product using a second die after the first step, wherein during the second step:
determining whether warpage in the formed product formed of the first component shape caused by elastic recovery due to the release from the first die is a first warp pattern in which longitudinal end portions of the component are lifted up to a front side of the top sheet part by elastic recovery due to the release from the first die or a second warp pattern in which the longitudinal end portions of the component are dropped to a back side of the top sheet part by elastic recovery due to the release from the first die,
press forming, when the warpage is determined to be the first warp pattern, of performing at least one of first forming in which angle formed by the vertical wall part with respect to the top sheet part on a concave side in the curved part is smaller than that of the first component shape and second forming in which an angle formed by the vertical wall part with respect to the top sheet part on a convex side in the curved part is larger than that of the first component shape is performed in the second step, and
press forming, when the warpage is determined to be the second warp pattern, of performing at least one of third forming in which an angle formed by the vertical wall part with respect to the top sheet part on the concave side in the curved part is larger than that of the first component shape and fourth forming in which an angle formed by the vertical wall part with respect to the top sheet part on the convex side in the curved part is smaller than that of the first component shape is performed in the second step.