Outer circle turning liquid plastic core clamping device suitable for national IV air cylinder sleeve

The invention provides an outer circle turning liquid plastic core clamping device suitable for a national IV air cylinder sleeve, which can clamp an air cylinder sleeve stably. A workpiece is stressed uniformly in the circumferential direction and is high in machining precision, and deforms slightly. The outer circle turning liquid plastic core clamping device comprises a machine tool main shaft; the machine tool main shaft is connected with a mandrel through a flange plate; a hydraulic oil cylinder is arranged in an inner cavity of the machine tool main shaft along the axis; a piston pin is arranged in the inner cavity of the machine tool main shaft along the axis; the hydraulic oil cylinder is connected with the piston pin through a hydraulic cylinder push rod; a communicating device cavity which extends to the outer surface of the mandrel is arranged in the inner cavity of the mandrel; a plurality of sections of expansion sleeves are arranged on the outer surface of the mandrel along the axial direction; the expansion sleeves coat the outer surface of the mandrel; the inner wall of each expansion sleeve is communicated with the communicating device cavity; the communicating device cavity is filled with liquid plastic.