Machining method for surfacing ball body of forced sealing ball valve

The invention relates to a machining method for a surfacing ball body of a forced sealing ball valve, and belongs to the technical field of ball valve machining. The spherical surface of the sphere is attached to the conical surface of the tool for positioning, automatic centering is formed, positioning errors are eliminated, and center holes in the two ends are machined in place at a time through an angle milling head of a gantry milling center. The axes of the center holes at the two ends are completely coaxial, and meanwhile complete coincidence of the center of the spherical surface and the axes of the center holes is ensured. And the lower shaft end spherical surface of the sphere is processed by using the same positioning method, and is processed after being checked by virtue of the end face reference and the excircle reference at the two ends, so that the obtained form and location tolerance and the nuclear dimensional tolerance can completely meet the design requirements. Therefore, the design referen