Method for rolling cone-shaped tube through steel plate

The invention discloses a method for rolling a cone-shaped tube through a steel plate. The method includes the steps that (1) blanking of the steel plate is carried out according to the axial height and the circumferential middle diameter length of the designed cone-shaped tube, the sufficient machining allowance is reserved, a fan-shaped blank plate is obtained, and correction is carried out; (2) according to the design requirement, a roll-bending allowance line and a roll-bending radiation line are marked in the height direction of the blank plate; (3) according to the designed bending radian, the two ends of the blank plate are subject to end pre-roll-bending treatment in the length direction, a pre-roll-bending part of the blank plate is subject to cutting treatment in the height direction according to the roll-bending allowance line, a corresponding splicing notch is formed; (4) roll-bending treatment is carried out according to the roll-bending radiation line, a cone-shaped barrel shape is obtained, the