Fixture for high-accuracy processing of outer circle molded lines of clamping piece

The invention discloses a fixture for high-accuracy processing of outer circle molded lines of a clamping piece. The fixture comprises a clamping chuck, a central shaft, a drawing rod, a fixture fixing piece and fixing screws, wherein a port is formed in the center of the clamping chuck; the drawing rod is arranged to penetrate through the central shaft from an opening, and comprises a rod body and a rod body fixing piece; the fixing screws penetrate through the fixing hole to be in screwed connection with the rod body fixing piece; the rod body fixing piece penetrates through a through grooveof the fixture fixing piece; and the fixture fixing piece is fixed to two ends of the rod body through the fixing screws. According to the fixture disclosed by the invention, in the process of finishturning of an outer circle, the deformation of a piston caused by clamping force can be effectively controlled, the situation that after the piston is stressed by clamping force, deformations of a major axis and deformation o