Cutter shaft clamping device of numerical control gear extruding machine

The utility model discloses a cutter shaft clamping device of a numerical control gear extruding machine to play a role of supporting a cutter shaft in the radial direction. The cutter shaft clamping device comprises a numerical control gear extruding machine stand column, and a lower cutter clamping body fixed to the lower end of the numerical control gear extruding machine stand column, a hollow lower cutter clamping body main shaft is arranged at the upper end of the lower cutter clamping body, and the lower cutter clamping body main shaft is installed on the lower cutter clamping body through a bearing. An inner hole of the lower cutter clamping body main shaft is provided with an elastic expansion sleeve, the taper of the inner hole of the lower cutter clamping body main shaft is the same as the taper of the outer diameter of the elastic expansion sleeve, the large end of a cone opening faces upwards, and the shaft axis of the elastic expansion sleeve coincides with the shaft axis of the cutter shaft of the numerical control gear extruding machine. A connecting rod is fastened to the lower end of the elastic expansion sleeve, the other end of the connecting rod is installed on a connecting rod base through a bearing, the lower end of the connecting rod base is connected with a piston rod of a hydraulic cylinder, and the hydraulic cylinder is installed on the lower cutter clamping body. The bending deformation of the cutter shaft is greatly reduced, the rigidity of the cutter shaft is enhanced, the service life is prolonged, and the machining precision of a machine tool and the product quality are guaranteed.