Combined machine tool for rough boring of piston seam allowance

The utility model provides a rough boring compound machine tool for piston spigots, and mainly relates to the field of piston rough machining equipment. A rough boring compound machine tool for piston spigots comprises a machine tool body, a machine tool spindle is rotatably arranged in the machine tool body, a three-jaw chuck is fixedly mounted at the outer end of the machine tool spindle, a movable sliding rail is fixedly mounted in the machine tool body, a sliding seat is slidably mounted on the movable sliding rail, and a sliding seat driving motor is fixedly mounted on one side of the movable sliding rail. A first threaded rod is rotationally installed on one side of the movable sliding rail, an output shaft of the sliding seat driving motor is connected with the first threaded rod through a coupler, a feeding sliding rail is arranged on the sliding seat, and a feeding driving motor is arranged on one side of the feeding sliding rail. The piston rough boring machine has the advantages that the piston rou