| 摘要 |
A method of producing an automotive vehicle bumper from an extruded blank of a heat treatable, age hardenable aluminum alloy. The method comprises heating the blank to a solution heat treating temperature for the alloy, working the blank while hot to a preliminary contour, quenching the hot formed blank to a temperature at which the temper of the alloy is unstable, cold working the blank before any appreciable natural age hardening occurs and to a bumper contour in which the blank is dimensionally stable, and ageing the formed and shaped blank. The blank may be subjected to further finishing operations including trimming and hole punching prior to ageing, and buffing, chemically brightening and anodizing the aged blank to enhance the appearance of the outer surface of the final bumper product. |
