Numerical Simulation For Aluminum Tube Extrusion Process And Optimum Design Of Die

For the present, the use of Aluminum alloy profile becomes more and more popular. Extruding method is commonly used in the production, because it can not only save raw material, but also has high productivity. So it is taken into account increasingly. However, die design often depends on the experience and trial-and-error over and over in production. In addition, the pattern of metal flow, stress distribution, strain distribution and stress of die are unclear because the extrusion process is accomplished in a closed chamber.In order to solve these problems, A16061 alloy profile of circular tube is analyzed. The extrusion is simulated by means of rigid-plastic FEM software Deform-3D. And it is implemented the optimum design.Firstly, it is introduced design principle of the porthole die and the theory of rigid-plastic. Secondly, the parameters and process of extrusion craft of A16061 alloy are calculated by DEFORM. Subsequently, it is found that the reason of die damage is stress concentration.Base on this reason, the method of optimum design is established. For obtaining the rational method, the effect on welding-on angle and welding-on height is studied, included 25°,30°,45°and 45mm,60mm,70mm,and the rule is found.The study used the law to die for structural optimization. These include changes in the number of die, increasing diversion ratio, changing welding angle and welding room high. In addition, in the actual work die will be distorted due to have deflection. So for these dies it is calculated the maximum deflection. It provides a theoretical basis for the actual mold. By this improvement, die life has been noticeably improved.Squeeze it is found that for the same area of central Vietnam the farther from the center, the speed is greater. The height is greater in the same time. In order to ensure the similar flow rate, the mathematical relation of extrusion rate and the area and position of porthole holes are created in extrusion-drum radius 125mm, it is newly. By use of the relational expression, it can be calculated the other parameters if the one is known. Thus, it can be achieved controlling export height and extrusion flow, which provides a theoretical basis for the design of the dies.