To solve various problems with aging treatment of a bumper structure after joining a bumper reinforcement to a stay raw material using electromagnetic formation to form the bumper structure, for example, low aging treatment efficiency (too many spaces generated when a plurality of stacks are made in a furnace) and low precision after the aging treatment.
A pipe-like 6000 series aluminum alloy extrusion material is expanded in its diameter by electromagnetic formation with a quality type T1 and the stay raw material 24 having a mounting flange 11 fixed on a front end of a side member is formed on the rear end. After the stay raw material 24 is subjected to aging treatment for a quality type T5, the stay raw material 24 is fitted into holes 7, 8 formed in vertical walls 3, 4 at the front and rear of the bumper reinforcement 1 formed from a 7000 series aluminum alloy extrusion material of the quality type T5 from the rear side. A pipe portion positioned on the forward side from around the vertical wall 4 on the rear side is expanded in its diameter and both of them are joined to each other.
KAITOKU KAZUMASA
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