A hat member 1 includes a top-plate portion 13, first ridges 113, and two side walls 11. The two side walls have a middle hardness Dc of 300 HV or higher. Each of the two side walls 11 includes a softened portion L and a strength-transition portion T adjacent to the softened portion L. The softened portion L has a hardness Dn lower than the middle hardness Dc by at least 8 % (Dc-Dn≥0.08Dc). The strength-transition portion T extends 0.5 mm or longer from the softened portion L toward the first end of the side wall. The strength-transition portion T has a hardness Dt that transitionally changes within the range of 8 % to 1 % lower than the middle hardness Dc (0.92Dc≤Dt≤0.99Dc). The hat member 1 further includes two second ridges 114 and two flanges 14.
HAT MEMBER AND MANUFACTURING METHOD THEREFOR
HUTELEMENT UND HERSTELLUNGSVERFAHREN DAFÜR
ÉLÉMENT DE CHAPEAU ET PROCÉDÉ DE FABRICATION ASSOCIÉ
2020-02-05
Patent
Elektronische Ressource
Englisch
IPC: | B62D MOTOR VEHICLES , Motorfahrzeuge / 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 / C21D Veränderung der physikalischen Struktur von Eisenmetallen , MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS |
HOLLOW SPRING MEMBER AND MANUFACTURING METHOD THEREFOR
Europäisches Patentamt | 2021
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