The CNC three-stage clamping die chipless servo jig steel tube opener developed by our factory draws lessons from the structural principle of lathe head and adopts the three-chuck type jig, which exerts force simultaneously from three angles.The design of the guide positive plate of the jig of the steel tube straightening and cutting the non-chip material opener does not need to adjust the concentricity of the jig again when the jig is replaced, and the replacement process is more convenient.When the pipe is broken, the deformation degree of the pipe is minimized to ensure the appearance quality.