Arc punching device for circular tube arc punching machine

The utility model belongs to the technical field of stamping equipment. The arc punching device for the circular tube arc punching machine comprises a base, the device comprises a workbench, an arc punching device and a driving device for driving the arc punching device to act, the arc punching device comprises a shell and a cutter body; the shell is provided with a first channel for mounting thecutter body and a second channel for inserting the end part of the circular pipe; the cutter body is in sliding fit with the first channel; a tool bit is arranged on the side, close to the second channel, of the tool body, a guide groove allowing the tool bit to slide is formed in the shell, the tool bit penetrates through the guide groove and extends into the second channel, during arc punching,the tool bit is located in the circular pipe, and the driving mechanism drives the tool body to slide in a reciprocating mode to drive the tool bit to punch an arc; limiting device is further arranged. According to the utility