Hot forming method and device for large-size aircraft thin-walled part of high-strength aluminum alloy

Abstract

Solution heat treatment is performed on a blank to dissolve initial coarse secondary phases, to obtain a uniform solid solution microstructure. The blank subjected to the solution heat treatment is transferred into the temperature-controllable forming die to be stamped and quenched. During forming, the temperature and the pressure are further maintained for a period of time. The temperature of the forming die is adjusted to a second-step aging temperature for the second-step aging treatment. In a two-step aging temperature range, stress relaxation occurs while strengthening precipitates are rapidly precipitated, thereby improving strength and dimensional accuracy of the formed part. On the premise of ensuring quality of the formed part, employing stepped aging treatment shortens the aging cycle and reduces energy consumption in the production and manufacturing process.