Long Tapered Tube Mandrel Rotary Pull Finite Element Simulation

Stretch Planishing and Drawing Combined Process (SPDCP) is a high efficient process technology of a non-mandril model for the extra long and non-seamed conical pipe-the nonferrous special type of profiled pipe. This technology has many characteristics such as high efficiency, small investment in equipments, lower machining cost and high efficient utilization of materials etc. Since 1980s, this new technology and its equipment have been developing in developed countries. Now, this special type of profiled pipe, especially the aluminium alloy profiled pipe has been used widely as high pole such as telegraph pole, lamp pole and flagpole etc in the city and road construction. On the one hand, the research on SPDCP in our country falls far behind developed countries, as yet there is even not a product line for Stretch Planishing and Drawing process. On the other hand, the urbanization progress and road construction are in the ascendant and there is a big demand for this alluminium alloy profiled pipe, so the development for Stretch Planishing and Drawing Combined equipment and the research on its mechanism has important theoretical and realistic significance,.In this paper, according to the characteristic of SPDCP, such as without mandril, the drawing force strengthened in the axial direction, contact loaded by rollers and so on , the theory of elastic-plastic(Mises yield criterion the flow theory of plasticity variation principle) and ANSYS have been applied to establish the FEM model of SPDCP without mandril.Stretch Planishing and Drawing Combined Process is a process of elastic-plastic deformation which has the following property: material non-linearity geometry non-linearity and contact non-linearity, therefore nonlinear equilibrium equations must be created Moreover, the key to solve non-linear equation is convergence, so the difficult problem of FEM simulation in this paper is how to set parameters which will influence convergence After repeating debug the ANSYS program, it is found that FKN is the main parameter which influences convergence, and finally the optimum value of FKN has been gained, which make the convergence problem of the FEM model of SPDCP without mandril has been well solved.The FEM simulation results of Stretch Planishing and Drawing Combined Process without mandril deeply disclosed the deformation characteristics of the SPDCP:1 There are typical local deformation characteristics in the SPDCP.2 The whole work-piece has elongated along the axial direction.3 The pipe's thickness is prone to increase while the pipe's diameters aredwindling away in the SPDCP.The results of the experiment involved in the paper basically accord with the FEM simulation ones, which pithily has proved that the FEM model and its program are correct and the conclusion drawn in the paper is credible...