Semicircular pipe equal-diameter flanging tool smaller than 180 degrees

The utility model relates to the technical field of petrochemical engineering, in particular to a semicircular pipe equal-diameter flanging tool smaller than 180 degrees. The semicircular pipe equal-diameter flanging tool comprises an upper die assembly, a lower die assembly and a semicircular pipe, the upper die assembly comprises a supporting pipe and an upper die, the upper die is installed at the bottom end of the supporting pipe, and the lower die assembly comprises a bottom plate, a pipe and a lower die; a pipe is fixedly installed at the top of the bottom plate, a lower die is fixedly installed at the top end of the pipe, a die hole is formed in the center of the lower die, inclined faces are arranged on the two sides of the interior of the lower die, and reinforcing plates are welded to the two sides of the semicircular pipe. When the semicircular pipe is subjected to equal-diameter flanging, the weak part of the edge of the opening is not easy to break. And the straightness of the semicircular pipe i