Screw worm hob

The utility model relates to a screw worm hob comprising a connecting blade handle (1), a shaft shoulder (2), a cutting part (3), a shaft shoulder (4) and a supporting blade handle (5). The cutting part (3) is composed of a worm screw. Shaft shoulders (2), (4) at both sides of the worm screw forms a conical stand body using the external diameter (d) of the worm screw as a end surface, and the diameter of other end surfaces of the shaft shoulders (2), (4) are bigger then the internal diameter (d1) of the worm screw. The connecting blade handle (1) is processed on the big diameter end of the shaft shoulder (2), and the supporting blade handle (5) is processed on the big diameter end of the shaft shoulder (4). The utility model is manufactured by a thread grinding machine and a universal tool grinding machine through the relatively matched technology. A screw worm hob with the diameter phi of 8MM is used for manufacturing a qualified ice control-proof accessory shaft of an engine. The utility model has the advantages that the diameter of the worm of the hob is small, worm teeth of small worm wheels, which can not be processed by an ordinary hob, can be processed by the utility model and thus the requirements of industrial production can be satisfied.