Patent ID: 8287012

Claim:
A method of manufacturing a bumper reinforcement for vehicles, the method comprising: deforming a hollow extruded product by plastic working to form the bumper reinforcement, wherein the bumper reinforcement is an integrally molded product, the bumper reinforcement includes a reinforced portion including a fixing portion, an inner end section adjacent to the fixing portion, and an outer end section adjacent to the fixing portion on an opposite side of the fixing portion from the inner end section, the fixing portion arranged to be fixed to a vehicle structural member at a part of the bumper reinforcement in a longitudinal direction, an intermediate portion adjacent to the inner end section of the reinforced portion, the intermediate portion has a lighter weight than the reinforced portion and is smaller in second moment of area and cross-sectional area than the reinforced portion, a length of each of the inner end section and the outer end section is from 50 mm to 350 mm and 0.5 to 3.5 times a length of the fixing portion, and the step of deforming the hollow extruded product includes applying a tensile force or a compressive force to the hollow extruded product in the longitudinal direction while heating the hollow extruded product, and then cooling the hollow extruded product to solidify and stabilize the deformed hollow extruded product.