Method for eliminating residual stress of aluminum alloy aviation forge cylinder

The invention discloses a method for eliminating residual stress of an aluminum alloy aviation forge cylinder. The method comprises the following steps that step 1, solution treatment and quenching heat treatment are carried out on the forged and formed forge cylinder, and in the quenching process, a circumferential supporting frame is arranged at the interior of the forge cylinder to prevent therelatively-large deformation of the long forge cylinder; step 2, according to the diameter, the wall thickness and the material performance of a quenched forge piece, the deformation amount of cold bulging is determined, and a corresponding cold bulging punch and lower cutting board are designed according to the calculated deformation amount of cold bulging; and step 3, the cold bulging punch is placed in the forge cylinder, the cold bulging punch is pressed downwards at the pressing speed of 2 mm/s till the cold bulging punch reaches the bottom end of the forge cylinder, the forge cylinder isturned over up and down,