| 摘要 |
A bumper beam of the present invention is provided with a tubular bumper reinforcement member (1) and a tubular crush box (2). A reinforcement member hole (15) is provided in an outer peripheral wall (11) of the bumper reinforcement member (1) in a penetrated manner. A partition wall (22) is provided so as to bridge opposed inner wall surfaces of an outer peripheral wall (21) of the crush box (2). The tip end portion of the crush box (2) is arranged so as to penetrate the reinforcement hole (15). In this state, ridge portions (25a, 25b) are formed, by means of a tube expansion process using a tube expansion die, on the crush box (2) so as to extend in a circumferential direction thereof at a front side and a rear side of the reinforcement hole (15). With this, the crush box (2) is secured to the bumper reinforcement member (1). According to the present invention, the bumper beam can be reduced in size and weight. |
