Gear fastening device of gear machining numerical control lathe and using method

The invention relates to the technical field of gear machining, in particular to a gear fastening device of a gear machining numerical control lathe and a using method.The gear fastening device comprises a fastening base and further comprises a sliding assembly, a driving assembly and an arc-shaped clamp assembly, and the arc-shaped clamp assembly comprises a sliding base and a top clamping shaft; an embedding inner ring is arranged on the inner side of the top of the sliding base, an embedding outer ring is arranged on the outer side of the top of the sliding base, and the embedding inner ring and the embedding outer ring are both fixedly connected with the top clamping shaft; liquid in the corrugated pipe expands along with the volume expansion of the gear, the clamp inner ring can be loosened along with the volume expansion of the gear, extrusion damage caused when the gear is heated and expanded is avoided, different gear pitches are suitable for the included angles of different movable push plates, and w