BUMPER STRUCTURE MANUFACTURING METHOD

PROBLEM TO BE SOLVED: To manufacture a bumper structure by joining a bumper reinforcement and a stay material by electromagnetic forming, while eliminating the following problems: when a jointed bumper structure is subjected to aging treatment, aging efficiency is poor (many spaces are formed in a f...

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Bibliographische Detailangaben
Hauptverfasser:	KAITOKU KAZUMASA, IMAMURA YOSHIHAYA
Format:	Patent
Sprache:	eng
Schlagworte:	MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL PERFORMING OPERATIONS PUNCHING METAL TRANSPORTING VEHICLES IN GENERAL VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISEPROVIDED FOR WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS ORPROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To manufacture a bumper structure by joining a bumper reinforcement and a stay material by electromagnetic forming, while eliminating the following problems: when a jointed bumper structure is subjected to aging treatment, aging efficiency is poor (many spaces are formed in a furnace when a lot of bumper structures are stacked), or accuracy after aging treatment is reduced.SOLUTION: A first stay material formed by cutting a temper T1 6000 series aluminium alloy extrusion into a predetermined size is expanded by electromagnetic forming to form a cylindrical part protruding rearward to have relatively large diameter. A second stay material having an attachment flange 11 is formed at a rear end. The second stay material is aged to have temper T5, and fitted from the rear into holes 7, 8 formed in front and rear vertical walls 3, 4 of a bumper reinforcement 1 formed of the temper T5 7000 series aluminium alloy extrusion. A portion located more forward than the rear vertical wall 4 is expanded by electromagnetic forming, to join them.