US 12,472,548 B2
Pressed component manufacturing method, die designing method, die shape designing device, and die
Kinya Nakagawa, Tokyo (JP); Toyohisa Shinmiya, Tokyo (JP); and Yuji Yamasaki, Tokyo (JP)
Assigned to JFE STEEL CORPORATION, Tokyo (JP)
Appl. No. 18/022,945
Filed by JFE STEEL CORPORATION, Tokyo (JP)
PCT Filed Jul. 15, 2021, PCT No. PCT/JP2021/026673
§ 371(c)(1), (2) Date Feb. 23, 2023,
PCT Pub. No. WO2022/049904, PCT Pub. Date Mar. 10, 2022.
Claims priority of application No. 2020-147655 (JP), filed on Sep. 2, 2020.
Prior Publication US 2023/0311186 A1, Oct. 5, 2023
Int. Cl. B21D 22/26 (2006.01); B21C 51/00 (2006.01); B23P 15/24 (2006.01)
CPC B21D 22/26 (2013.01) [B21C 51/00 (2013.01); B23P 15/24 (2013.01)] 23 Claims
OG exemplary drawing
 
1. A pressed component manufacturing method for press forming a metal sheet into a final component shape through a plurality of press steps, the component manufacturing method comprising:
selecting one step from the plurality of press steps and setting the one step as a selection step, a component shape obtained in the selection step being set as a selected component shape;
selecting one press step from the plurality of press steps to be carried out before the selection step and setting the one press step as a reference step, a shape of the metal sheet before press forming in the reference step being set as a reference shape, wherein the press steps from the reference step to the selection step include a press step having drawing;
a cross section setting step of setting a line orthogonal to, in plan view, a direction in which a material flows when the metal sheet of the reference shape is drawn into the selected component shape by a single step, and setting a plurality of cross sections individually cut by each of planes orthogonal to the line in plan view and extending in a direction along a sheet thickness direction of the metal sheet before forming;
an inflow amount calculation step of individually determining the inflow amount of the material required for forming the reference shape into the selected component shape based on a cross-sectional line length of the selected component shape cut by the cross section, a cross-sectional line length in the reference shape cut by a same cross section as the cross section, and a uniform elongation of the material of the metal sheet for each cross section;
an inflow amount distribution step of distributing the determined inflow amount to each step from the reference step to the selection step for each cross section;
a cross-sectional line length calculation step of individually calculating the cross-sectional line length for each cross section in each step from the reference step to a step one before the selection step based on the distributed inflow amount;
a shape determination step of determining a preformed shape after the press forming in each step from the reference step to the step one before the selection step based on the calculated cross-sectional line length; and
a manufacturing step of pressing the metal sheet into the final component shape through the plurality of press steps.