Mobile male mold for inner hole of hot extrusion forming type large-specification screw drill centering device

The utility model belongs to the technical field of hot extrusion molds and provides a mobile male mold for an inner hole of a hot extrusion forming type large-specification screw drill centering device. The mobile male mold comprises an upper mold base, wherein a cushion plate is arranged in the upper mold base; guide rail plates are respectively arranged on two sides in the upper mold base; a punching male mold is connected to a connection body; the connection body is fixed on the upper mold base; a hydraulic cylinder is connected to and arranged on the connection body; a positioning block is arranged on the upper mold base. By virtue of the mobile male mold for the inner hole of the hot extrusion forming type large-specification screw drill centering device, the vertical movement distance of a movable transverse beam on an oil press is greatly decreased, and the shut height of equipment is decreased, so that a punching process is completed, and the aim of a hot extrusion forming process for the large-speci