Near-equal-thickness die-free spinning method for thin-wall part of convex generatrix revolved body

The invention discloses a near-equal-thickness die-free spinning method for the thin-wall part of a convex generatrix revolved body. The near-equal-thickness die-free spinning method comprises the steps that a circular plate blank is clamped between a main shaft and a tail top of a numerical control spinning machine, and it is guaranteed that the axial center lines of the circular plate blank, the main shaft and the tail top coincide; a spherical spinning roller with a circular chamfer machined on the radial edge is installed on the numerical control spinning machine, and the circular chamfer and the spherical surface of a spherical spinning roller body are in smooth tangent transition; the height of the spherical spinning roller is adjusted, so that the axial center lines of the spherical spinning roller, the circular plate blank, the main shaft and the tail top are located in the same horizontal plane, and the axial center line of the spherical spinning roller is parallel to the axial center line of the mai