High-precision control method for drum pressing preforming of large-size tailor-welded blank with high radius-thickness ratio

The invention relates to the field of integrated manufacturing of large storage tanks for spaceflight, and particularly discloses a large-size high-radius-thickness-ratio tailor-welded blank pressing drum preforming high-precision control method which comprises the steps that a first set of die is used for executing a multiple-time pressing process on the whole face of a plate; a second set of die is used for carrying out multiple pressing processes on the whole surface of the plate; the first set of mold and the second set of mold correspond to the same opening diameter, and the opening diameter is 800-1000 mm; the curvature radius corresponding to the first set of die is larger than the curvature radius corresponding to the second set of die, the curvature radiuses corresponding to the first set of die and the second set of die are both determined through the opening diameter and the chord height difference H, H = delta + (60-80) mm, and delta is the thickness of the plate. According to the scheme, point co