Copying turning apparatus for water sleeve arcuated inner bore in round blank crystallizer

The invention discloses a copy turning device for an arc shaped inner cavity of a water jacket in a round billet crystallizer, which comprises a headstock chuck, a tailstock center and an apron, wherein the apron is provided with an intermediate splint. The device is characterized in that both sides of the intermediate splint are fixed with brackets, the brackets are provided with jackscrew rods,and workpiecs are clamped in the brackets through pressure shoes; a tool pan is positioned in the middle of the workpiece and is arranged on a cutter spindle, and a nut is fastened by a tool pan, oneend of the cutter spindle is locked on the chuck, and the other end of the cutter spindle is pressed against the tailstock center; the non-operation side of the intermediate splint is provided with aconnecting plate; one end of the connecting plate is connected with the intermediate splint, while the other end is connected with a profiling mechanism; the profiling mechanism is fixedly connected with the non-operation side