Provided is a frame member formed by hot-stamping a steel sheet. The frame member has a closed cross section portion in which a cross section perpendicular to a longitudinal direction is a closed cross section, and the closed cross section portion has at least two flat parts having a radius of curvature larger than a maximum external dimension of the cross section, and a recessed bead part formed between the two flat parts. The recessed bead part has a pair of wall portions which have a radius of curvature of 50 mm or greater, and protrude toward an inside of the closed cross section portion from end portions of the two flat parts facing each other via a pair of bent portions bent toward an inside of the closed cross section. A Vickers hardness of a thickness middle portion in the wall portion is 520 Hv or greater, a width of the wall portion is 0.5 times or greater and 2.5 times or less an effective width We, and a standard deviation ratio obtained by dividing a standard deviation of hardness frequency distribution in a surface layer portion in the wall portion by a standard deviation of hardness frequency distribution in the thickness middle portion in the wall portion is less than 1.0.


    Access

    Download


    Export, share and cite



    Title :

    SKELETON MEMBER


    Additional title:

    SKELETTELEMENT
    ÉLÉMENT DE SQUELETTE


    Contributors:
    AITOH TAKAHIRO (author) / TODA YURI (author) / TABATA RYO (author)

    Publication date :

    2025-06-18


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English


    Classification :

    IPC:    B21D WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL , Bearbeiten oder Verarbeiten von Blechen, Metallrohren, -stangen oder -profilen ohne wesentliches Abtragen des Werkstoffs / B62D MOTOR VEHICLES , Motorfahrzeuge



    SKELETON MEMBER

    KUBOTA HIROAKI / TODA YURI / KAWATA HIROYUKI | European Patent Office | 2022

    Free access

    SKELETON MEMBER

    KUBOTA HIROAKI / TODA YURI / KAWATA HIROYUKI | European Patent Office | 2020

    Free access

    SKELETON MEMBER

    AITOH TAKAHIRO / TODA YURI / TABATA RYO | European Patent Office | 2022

    Free access

    VEHICLE SKELETON MEMBER

    HAMADA KOICHI | European Patent Office | 2023

    Free access

    VEHICLE SKELETON MEMBER

    KUZUSHIMA SHINYA | European Patent Office | 2022

    Free access