Differential extrusion process for pipe fitting elbow is to realize

　　Differential extrusion process for pipe fitting elbow is to realize differential flow of inner and outer arcs of pipe billet at the die opening through eccentric design of pipe billet, thus pipe fitting elbow by bending. Through eccentric design of tube blank, differential flow of inner and outer arcs of tube blank can be realized. The difference of velocity can reach the anticipated assumption, but the bending curvature of Stainless Steel 120 Degree Butt Welded Pipe Fitting Elbow does not meet the requirements. By comparing and analyzing the simulation results of different loading schemes, the influence of different loading paths on the bending curvature of pipe fitting elbow is obtained, which lays a solid foundation for further research.

　　According to the speed difference requirement converted from the pipe fitting elbow specification and the characteristics of differential extrusion forming process, the tube blank and forming die were designed. The forming characteristics of pipe fitting elbow by differential extrusion were studied. Pipe fitting elbow was found that the cross section of the formed elbow was not flattened, the wall thickness was uniform, the error requirement was met, and the residual stress was small.