Boring clamp for machining gear milling machine special-shaped oil cylinder and machining method

The invention relates to a boring clamp for machining a gear milling machine special-shaped oil cylinder and a machining method. The boring clamp is characterized in that the boring clamp comprises a clamp base, supporting plates arranged on the clamp base and a locating frame arranged between each set of supporting plates, wherein locating supporting plates matched with rectangular grooves in the bottom of the special-shaped oil cylinder are mounted on the locating frames; the boring clamp comprises a first screw frame and a second screw frame which are mounted on the upper end face of the clamp base, the first screw frame corresponds to one side face of the rectangular body of the special-shaped oil cylinder, the second screw frame corresponds to the other side face of the rectangular body of the special-shaped oil cylinder, and the first screw frame and the second screw frame are provided with first adjusting screws and boring rod supports, wherein the boring rod supports are symmetrically arranged on the