A method of press-forming a tubular part having a cross section of an irregular shape crushes a steel tube between an upper die and a lower die in order to form a V-shaped cross section. When the curvature radius of a tip of the upper die is defined as R 1 , the curvature radius of a bottom portion of the lower die corresponding to the tip of the upper die is defined as R 2 , and the wall thickness of the steel tube is defined as t; R 1 , R 2 , and t satisfy R 1 +2t=R 2 and 1.5t¤R 1 ¤3t.
PRESS-FORMING METHOD OF TUBULAR PART HAVING CROSS-SECTION OF IRREGULAR SHAPE
VERFAHREN ZUM PRESSFORMEN EINES RÖHRENFÖRMIGEN GLIEDS MIT UNREGELMÄSSIGER QUERSCHNITTSFORM
PROCÉDÉ DE FORMAGE SOUS PRESSE D'ÉLÉMENT TUBULAIRE DE SECTION TRANSVERSALE IRRÉGULIÈRE
2018-09-26
Patent
Electronic Resource
English
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 / B60G VEHICLE SUSPENSION ARRANGEMENTS , Radaufhängungen und Federungen für Fahrzeuge |
European Patent Office | 2017
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