Method for correcting roundness of formed cylinder

The invention discloses a method for correcting the roundness of a formed cylinder, belongs to the technical field of metal pressure processing equipment, can be used for various different sunken phenomenon types of the formed cylinder, is safe and reliable in the whole correcting process, is convenient to operate, and can effectively improve the cylindricity quality of the formed cylinder. A semi-transparent sealing ball and an inner flow assisting ring are arranged in the upper roller and matched with self-flowing cooling liquid and lubricating heat conduction particles, in the correction process, on one hand, the friction force between the barrel and the upper roller can be effectively reduced, and then the surface of the barrel is effectively protected against damage in the correction process; on the other hand, by improving the self-flowing of the self-flowing cooling liquid, it can be effectively guaranteed that the stress structure in the barrel is not prone to being affected by heat when corrected and