Multi-core-rod pipe fitting inner punching flanging machine

The invention discloses a multi-core-rod pipe fitting inner punching flanging machine. The machine comprises a machine body serving as a bearing main body and further comprises a punching flanging device arranged on the machine body, the punching flanging device comprises a hinged support, a rear oil cylinder and a punching flanging unit, the rear oil cylinder and the punching flanging unit are arranged on the hinged support, and the punching flanging unit converts horizontal displacement generated by the rear oil cylinder into vertically upward displacement to conduct punching; the machine further comprises a driving device and a die clamping unit, and the driving device is used for driving a pipe fitting with core rods inserted in to move along the advancing direction; and the die clamping unit and the punching flanging unit fasten the two ends of the core rod pipe fitting. The machine is simpler in structure, stable, reliable and convenient to maintain; an open type inclined boss structure is adopted in a