Combined Haff elbow forming die

The utility model discloses a combined Haff elbow forming die which comprises a concave die (1) and a convex die (2). The combined Haff elbow forming die is characterized in that the concave die (1) is composed of a steel baseplate (101) and a plurality of concave die steel pieces (102) welded on the steel baseplate (101), each concave die steel piece (102) is provided with a concave-arc notch (103), adjacent concave die steel pieces (102) are connected through spot welding, all concave-arc notches (103) form a groove matched with the outer surface of a formed Haff, the convex die (2) is composed of a mounting steel plate (201) and a plurality of hemispherical convex die steel pieces (202) welded on the mounting steel plate (201), and adjacent hemispherical convex die steel pieces (202) are connected through spot welding. The combined Haff elbow forming die has the advantages of high strength, easiness in manufacturing and lowering of die manufacturing cost, service life of the die can be prolonged, and manuf