Study Of U-Forming Process On Large-Diameter Line-Pipe

UOE line-pipe forming process is one of the widely used processes internationally in large-diameter LSAW pipe forming.UOE forming process is a complex deformation process involving a long line of technology, many process parameters and mold structure parameters, and various parameters impact the quality of the ultimate pipe differently. In the forming process, U-forming is a typical intermediate process, and also the only process with two forming processes, their theoretical analysis, finite element modeling and analysis of process parameters is very important to help people digesting and absorbing foreign technology, optimizing the process parameters and improving the quality of products.The development of UOE forming process and its studies at home and abroad is described. The theoretical analysis of U-forming process was done in this paper, and according to the current forming process, the bending formula at the vertical and horizontal direction is derived, as well as the expression method about the rebound analogously.For the process of UOE, with the MARC finite element analysis software platform, basing on the continuous simulation model of UOE forming process, the process of the U-forming for different steel pipe is stimulated, the deformation characteristics of U-forming process and distribution of the stress and strain is analysed.The main parameters of U-forming process including the work stroke of U-punch: Su,the work stroke of: Ss and the spacing of the two level-rollers: Ds. These parameters not only have an impact on the shape of intermediate rough, but also on the forming load to a certain extent. In the article, through the finite element numerical simulation, the process parameters'impact on the geometry and forming load of intermediate rough are analyzed which laid the foundation of parameter optimization of the overall process.