Preparation method for shell making process of high-temperature alloy bent pipe

The invention relates to a preparation method for a shell making process of a high-temperature alloy elbow. The preparation method comprises the following steps: preparing an in-pipe drying tool and selecting a flexible air pipe; adhering surface layer slurry to the surface of the wax mold, and adhering a first layer of fine sand; after the surface layer is dried, the transition layer slurry continues to be adhered, and a second layer of fine sand is adhered; an air hose is inserted into the wax mold; after the second layer is dried, back layer slurry is pasted, and a third layer sand shell is pasted; inserting the soft air pipe into the wax mold again, and communicating with compressed air; a through hole in one side of the wax mold is blocked through refractory cement, 30-mesh back layer sand is added into the wax mold from a pipe opening in the other side of the wax mold, and a pouring opening is sealed through refractory cement; and continuing to stick the back layer slurry and the coarse sand on the oute