Machining method of thin-wall ring piece and clamp for finish machining

The invention discloses a machining method of a thin-wall ring piece and a clamp for finish machining, and belongs to the technical field of ring piece machining. The machining method comprises rough machining; rough machining, heat treatment and semi-finish machining are conducted, the axial end face of the ring piece is machined to the set axial length of the ring piece, a first gap is reserved between the outer diameter end face of the ring piece and the positioning groove, and a first positioning shaft and a positioning sleeve are matched to conduct first axial clamping on the ring piece through finish machining; the inner diameter end face of the ring piece is machined; a second gap is reserved between the inner diameter end face of the ring piece and the first positioning boss; the second positioning shaft and the positioning baffle plate are used for carrying out second axial clamping on the ring piece; the outer diameter end face of the ring piece is machined to obtain a target ring piece; the finish