Method for manufacturing aluminum alloy hollow section for sedan bumper

The invention discloses a method for manufacturing an aluminum alloy hollow section for a sedan bumper, relates to a method for manufacturing an aluminum alloy hollow section, and aims to solve the problem that domestic limousine bumpers are low in tensile strength and non-proportional extension strength and dependent on import. The method comprises the following steps of: 1, preparing alloy melt; 2, casting an alloy cast rod; 3, cutting the cast rod off; 4, turning the cast rod to remove oxide; 5, performing homogenizing annealing; 6, heating a cast ingot; 7, extruding; 8, pre-straightening;9, quenching; 10, straightening; 11, aging; and 12, cutting according to length to obtain the aluminum alloy hollow section for an automobile bumper. The straightness and size of the hollow section prepared by the method completely meet the standards of imported bumpers, and the hollow section has high comprehensive mechanical properties. The method can be used for processing and manufacturing sections for limousine bumpers.