Investigation of Some Parameters Influencing of Three-Dimensional Tube Extrusion Process of Ellipse Section Through Streamline Die

Abstract

In cold lubricated tube extrusion of ellipse section the material properties and surface quality of the extruded products are influenced by the die profile so in the present analysis the axial velocity component on the intermediate cross-section in the plastically deforming region is expressed as a general function of the coordinates. This allows the description of complete three-dimensional distortion of flow rendering more realistic flow patterns. From the derived kinematically admissible velocity field, corresponding upper-pound theory the extrusion pressure is then obtained by optimizing the pressure with respect to the given parameters. The effective strains are computed in order to study the work hardening pattern of the extruded products ,also (F.E M) by ANSYS (11) software was used in building, loading and solving the extrusion process, the model generation depends on the billet (AL 2024 fully annealed) have been carried as the working material. In the computation the product shape was ellipse with the effects of area reduction, die length product shape complexity and frictional condition on the extrusion pressure, the metal flow and distribution of the final effective strain have been studied extensively. The simulation using (ANSYS 11 PROGRAM), theoretical predictions both in extrusion load and metal flow are in good agreement with the experimental results.