High-strength aluminum alloy isothermal direction-change open die forging method and device

The invention relates to a high-strength aluminum alloy isothermal direction-change open die forging method which comprises the following steps: heating preprocessed high-strength aluminum alloy blank in a direction-change isothermal forging heating holding furnace at the temperature of 350-450 DEG C, and keeping the furnace temperature unchanged; and according to the structure property indices required by the blank, repeatedly upsetting and drawing the blank in the direction-change isothermal forging heating holding furnace until the blank reaches the design size of the forge piece. The isothermal direction-change open die forging device comprises a heating furnace and a forging press, wherein the furnace body is installed on the forging platform of the forging press; the forging rammer of the forging press is installed in a through hole in the furnace bottom plate; and the forging head of the forging press is installed in a through hole in the furnace top plate. The invention has the advantages of simple technique, convenient operation, and low tendency to recrystallization, enables the high-strength aluminum alloy to be under isothermal conditions all through the direction-change open die forging process, does not need to heat the blank again in the forging process, improves the quality of the forge piece and enhances the forging efficiency; and the forge piece has the advantages of sufficient structure deformation, uniform deformation at each part, and low tendency of cracking. The forge piece has favorable structure properties, and is suitable for industrial production.