The invention provides a skeleton member which is formed by hot-stamping a steel plate. The skeleton member has a closed cross-section portion in which a cross-section perpendicular to the longitudinal direction is a closed cross-section, and the closed cross-section portion has: at least two flat portions which are portions having a radius of curvature larger than the maximum outer dimension of the cross-section; and a concave rib portion formed between the two flat portions. The concave bead portion has a pair of wall portions having a radius of curvature of 50 mm or more, and protruding toward the inside of the closed cross-section portion from mutually facing end portions of the two flat portions via a pair of bent portions bent toward the inside of the closed cross-section. The Vickers hardness of the plate thickness center portion of the wall portion is 520 Hv or more, the width of the wall portion is 0.5-2.5 times the effective width (We), and the standard deviation ratio obtained by dividing the standard deviation of the hardness frequency distribution of the surface layer portion of the wall portion by the standard deviation of the hardness frequency distribution of the plate thickness center portion of the wall portion is less than 1.0.

    本发明提供一种骨架部件,通过对钢板进行热冲压而形成。骨架部件具有与长度方向垂直的截面为闭合截面的闭合截面部,闭合截面部具有:至少两个平坦部位,是曲率半径大于该截面的最大外形尺寸的部位;以及凹加强筋部位,形成在两个平坦部位之间。凹加强筋部位具有一对壁部,所述一对壁部的曲率半径为50mm以上,从两个平坦部位中的相互对置的端部经由朝向闭合截面内部弯曲的一对弯曲部而朝向闭合截面部的内侧突出。壁部中的板厚中心部的维氏硬度为520Hv以上,壁部的宽度为有效宽度(We)的0.5倍以上2.5倍以下,壁部的表层部的硬度频率分布的标准偏差除以壁部的板厚中心部的硬度频率分布的标准偏差而得的标准偏差比小于1.0。


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    Title :

    Framework component


    Additional title:

    骨架部件


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

    Publication date :

    2023-12-12


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Chinese


    Classification :

    IPC:    B62D MOTOR VEHICLES , Motorfahrzeuge



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