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    METHOD FOR PRODUCING PRESSED COMPONENT, METHOD FOR DESIGNING DIE, DIE SHAPE DESIGNING DEVICE, AND DIE
    2.
    发明公开
    METHOD FOR PRODUCING PRESSED COMPONENT, METHOD FOR DESIGNING DIE, DIE SHAPE DESIGNING DEVICE, AND DIE 审中-公开

    公开(公告)号：US20230311187A1

    公开(公告)日：2023-10-05

    申请号：US18024401

    申请日：2021-07-15

    Applicant: JFE STEEL CORPORATION

    Inventor： Kinya NAKAGAWA ,  Toyohisa SHINMIYA ,  Yuji YAMASAKI

    IPC: B21D24/00 ,  B21D22/26 ,  B21D43/28

    CPC classification number: B21D24/005 ,  B21D22/26 ,  B21D43/28

    Abstract: A method for producing a pressed component and for designing a die applicable even when a component shape that cannot be formed without being greatly drawn is produced. A method for producing a component for press forming a metal sheet into a final component shape through two or more press steps including a step carried out by drawing includes: determining the inflow amount of a material required for forming the metal sheet into the final shape based on the increase in the cross-sectional line length of the shape with respect to the line length of the sheet before forming in the press forming of the sheet into the final component shape by a step; and distributing the determined inflow amount of the material to each step including a final press step, and determining a preformed shape after forming in steps other than the final step based on the inflow amount

    PRESSED COMPONENT MANUFACTURING METHOD, DIE DESIGNING METHOD, DIE SHAPE DESIGNING DEVICE, AND DIE
    3.
    发明公开
    PRESSED COMPONENT MANUFACTURING METHOD, DIE DESIGNING METHOD, DIE SHAPE DESIGNING DEVICE, AND DIE 审中-公开

    公开(公告)号：US20230311186A1

    公开(公告)日：2023-10-05

    申请号：US18022945

    申请日：2021-07-15

    Applicant: JFE STEEL CORPORATION

    Inventor： Kinya NAKAGAWA ,  Toyohisa SHINMIYA ,  Yuji YAMASAKI

    IPC: B21D22/26 ,  B21C51/00 ,  B23P15/24

    CPC classification number: B21D22/26 ,  B21C51/00 ,  B23P15/24

    Abstract: A pressed component manufacturing method wherein, in press forming a metal sheet into a final component shape through two or more press steps, the inflow amount of the required material is determined based on the increase in the cross-sectional line length of the shape with respect to the line length before forming when the metal sheet is press formed by a single press step, the determined amount is distributed to each step, and a preformed shape after press forming based on the distributed inflow amount. As the cross section, a line orthogonal to a direction in which the material flows when the metal sheet is drawn is set, and a plurality of cross sections is set which is individually cut by each of planes orthogonal to the line and extending in a direction along the sheet thickness direction of the metal sheet before forming.

    DELAYED FRACTURE CHARACTERISTIC EVALUATION METHOD AND PROGRAM
    5.
    发明公开
    DELAYED FRACTURE CHARACTERISTIC EVALUATION METHOD AND PROGRAM 审中-公开

    公开(公告)号：US20240044760A1

    公开(公告)日：2024-02-08

    申请号：US18255932

    申请日：2021-07-29

    Applicant: JFE STEEL CORPORATION

    Inventor： Yuichi MATSUKI ,  Toyohisa SHINMIYA ,  Kinya NAKAGAWA ,  Yuji YAMASAKI

    IPC: G01N3/20

    CPC classification number: G01N3/20 ,  G01N2203/0064 ,  G01N2203/0067 ,  G01N2203/0236 ,  G01N2203/0282

    Abstract: To further enhance the evaluation accuracy of a delayed fracture. Focusing on the fact that a calculated stress value serving as the reference for the occurrence of the delayed fracture changes depending on analysis conditions of a forming analysis, a value obtained by changing a stress value serving as the reference for the occurrence of the delayed fracture according to the analysis conditions for analyzing an intended formed article (article for practical use) is used as the reference for evaluating the delayed fracture. For example, analysis conditions of a forming analysis in an evaluation test of the delayed fracture are matched with analysis conditions of a forming analysis of an article for practical use represented by an actual automobile component.

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