Special fixture for milling tooth profile

The utility model discloses a special fixture for milling a tooth profile, which comprises a base, a mandrel and a key, a counter bore A is arranged at the center of the inside of the base, a boss is arranged at the top of the counter bore A, the mandrel is a stepped shaft with threads, the upper half part of the mandrel is a threaded shaft, a key slot is arranged on one side of the lower half part of the mandrel, and the bottom of the mandrel is a bottom plate. Three counter bores B arranged in the circumferential direction are formed in the bottom plate, and a pin hole is formed between two counter bores B; the mandrel penetrates through a counter bore A of the base in a matched mode from bottom to top, and a screw a and a cylindrical pin penetrate through a counter bore B and a pin hole in a matched mode to fixedly connect the bottom plate with the base; the key is fixedly connected into the key groove through a screw b, the gasket penetrates through a shaft body of the mandrel in a matched mode, and a nut