Automatic turning tool for inner molded surface of split thin-wall casing and using method

The invention discloses an automatic turning tool for the inner molded surface of a thin-wall casing and a using method, and belongs to the field of machining and manufacturing of heavy parts of aviation engines. The design and manufacturing of a multi-point positioning-clamping-supporting automatic tool system of split casing parts are mastered through a plurality of sets of fan-shaped push block units, the mechanical transmission design is ingeniously utilized, and the machining efficiency is improved. And under the action of the same hydraulic pump, the hydraulic pump is close to a part and provides the same bearing force for multi-point support. A link mechanism with a simple and reliable structure is used for expanding the stroke of the supporting block. The bearing block can slightly move in the circumferential direction while moving in the radial direction, and the moving amount is automatically adjusted by means of the molded surface of the bearing block, so that the molded surface of the bearing bloc