Punching device for annular workpiece

A punching device for an annular workpiece belongs to the technical field of punching processing, aims to solve the problems that polishing cannot be performed in the punching process, and when a punching tool bit deviates from a coaxial line, the shape of a punched hole is deformed, and the punched hole is inclined, and comprises a rack and a control cabinet fixedly mounted on the outer wall of one side of the rack, a hydraulic assembly and a compression assembly are fixedly installed on the top face of the inwards-concave area of the rack, a connecting assembly is fixedly installed on the bottom face of the hydraulic assembly in a communicating mode, a grinding assembly is rotatably installed on the lower portion of the connecting assembly, and a fixed threaded rod is further fixedly installed on the top face of the inwards-concave area of the rack. According to the punching device, in the punching process, the inner wall of a punched hole can be polished twice, large burrs on the inner wall of the punched