Patent ID: 8814234
Filing Date: 2014-08-26
Classification: B21D,B60R,Y10T

Abstract:
1. A method of manufacturing a vehicle bumper beam equipped with a bumper reinforcement member to be arranged along a vehicle width direction and a crush box having a tip end portion configured to support the bumper reinforcement member, the method includes: a step of preparing a bumper reinforcement member as the bumper reinforcement member including a reinforcement member hole penetrating at least a part of an outer peripheral wall in a fore and aft direction; a step of preparing a crush box as the crush box including a partition wall bridging opposed inner surfaces of an outer peripheral wall; a step of securing the crush box to the bumper reinforcement member by forming reinforcement member side ridge portions of the crush box at a front side and a rear side of the reinforcement member hole so as to extend in a circumferential direction by a tube expanding process using a tube expanding die with the tip end portion of the crush box penetrating the reinforcement member hole; a step of preparing a bumper stay including a stay hole penetrating in the fore and aft direction; and a step of securing the crush box to the bumper stay by forming stay side ridge portions of the crush box at a front side and a rear side of the stay hole so as to extend in a circumferential direction by a tube expanding process using a tube expanding die with a basal end portion of the crush box penetrating the stay hole; wherein the reinforcement member side ridge portions and the stay side ridge portions are simultaneously formed with the same tube expanding die.