Numerical Simulation Analysis On Porthole Dies Extrusion Of Aluminum Mini-thin Harmonica-shaped Tube

Aluminum alloy extrusion technology is playing a important role in the areas ofindrustial circles. With the development of national economy, the automobile industry havepay more attention to the precision manufacturing of automobile spare parts. The futuredevelopmeng trend of aluminum alloy manufacture is Ultraprecision machining andminiaturization of machine.Aluminum allloy used for the body of the car is the casting aluminum alloy and thewrought aluminum alloy.The wrought aluminum used for a cooling system of automobilewhose fundemental structure is mini-thin harmonica-shaped tube.The study is intended todesign the manufacturing process of the profile and related techniques.The research and development of the profile is realized by porthole die extrusion in thetraditional technology. The overall size of the profile is very small and the wall thickness is sothin that welding process can not be implemented in real production. The extrusion productoften have fracture phenomenon. The surface quality and mechanical property do not meet therequest of real production.This paper describes a3D-deform simulation of porthole die extrusion process forproducing harmonica-shaped tubes used for a cooling system of automobiles. Designing therelated structure of the porthole die and observing the simulation results, the study wasdesigned to evaluate the welding effect when the length of bearing exit and the size of circletaken different values.The mean pressure and exit velocity at the welding plane are analyzedat the same time. The welding effect is determined by the mean pressure at the weldingplane.The behavior of metal flow in the container is analyzed in this paper.Using MATLAB neural network toolbox, we will optimize the parameters of theforming of the mini-thin harmonica-shaped tube concluding extrusion temperature, extrusionspeed, the length of bearing part, friction coefficient. We will search the optimical parametersthrough DEFORM simulation.Through the above analysis, the best structure and size can beobtained in the process of deformation so as to obtain the better machanical properties.