Improved method of manufacturing aluminum-copper-lithium alloy sheet metal for manufacturing airplane fuselage

摘要

The present invention relates to a method for producing a rolled aluminum alloy product, in which a) by weight%, Cu: 2.1 to 2.8, Li: 1.1 to 1.7, Mg: 0.2 to 0.9. , Mn: 0.2 to 0.6, Ti: 0.01 to 0.2, Ag <0.1, Zr <0.08, Fe and Si: each ≤0.1, unavoidable impurities each ≤0 A step of casting an alloy slab containing 0.05% and a total of ≤0.15, the balance of aluminum, and b) a step of homogenizing the slab at 480 to 520 ° C. for 5 to 60 hours, and c). The step of hot-rolling the homogenized slab into the shape of sheet metal and optionally cold-rolling, and d) the step of liquefying the sheet metal at 470 to 520 ° C. for 5 minutes to 4 hours, and e. ) Steps of quenching the solution-treated sheet metal, f) Steps of performing controlled tension of the solution-treated and hardened sheet metal with a permanent deformation of 1 to 6%, and g) Tensioned sheet. The object of the production method comprises a step of aging the metal by heating it at a temperature of at least 160 ° C. for a maximum time of 30 hours. [Selection diagram] Fig. 3