Fixture for milling internal groove of synchronizer gear sleeve

The utility model relates to positioning and clamping devices for processing an automobile synchronizer gear sleeve, in particular to a fixture for milling an internal groove of the synchronizer gear sleeve. The fixture is characterized in that an expansion sleeve is fixed on a base, a T-shaped taper mandrel capable of vertically moving and matching with the taper of the expansion sleeve is arranged coaxially with the expansion sleeve, the matched taper angle of the expansion sleeve and the T-shaped taper mandrel is 18 degrees, limit blocks are arranged below the T-shaped taper mandrel, and a positioning block is arranged outside the expansion sleeve and fixed on the base. By the aid of the fixture, labor intensity of operators is greatly reduced, production efficiency is improved, and the shortcoming that an original mandrel cannot be adaptive to different minor diameters of internal splines of the gear sleeve is eliminated so that product quality is enhanced.