Numerical Simulation Of Aluminum Profile Extrusion Process And Structure Optimization Of Extrusion Die

Aluminum alloy profiles have an advantage on high intensity,light weight and corrosion resistance,playing an important role in the fields of transportation,architecture and communal facilities.The process of profile extrusion is in the environment of high temperature,high pressure and high friction.The die structure and process parameters are mostly dependent on the experience of die designers.In this mode,the process of die making must spend much time on manufacturing,testing,repairing and more.With the development of computer technology,numerical simulation technology has been widely used in the field of aluminum profile extrusion not only in domestic but also on abroad,becoming an important tool to study the rules of die structure and the process of aluminum profile.The main research contents in this dissertation are as follows:1.The basic method of this paper is that applying for the numerical simulation for studying the process of pothole die extruding profiles and the proposing the optimization scheme of die structure.First of all,theoretical formulas are used to calculating and designing the pothole die.Next,the results of numerical simulation using the numerical simulation software,the results of process proof the accuracy and reliability of QForm software after many hours computing.2.Concrete plans of numerical simulation are made to study the influence of changing height of welding chamber and depth of porthole.According to the equivalent stress of die,the hydrostatic stress of welding chamber,the mandrel displacement in Z-direction and the extrusion force,the optimal value of die structure can be obtained for the reference of the die design.3.Specific plans of bridge-sinking are proposed,and studying the depth and location of the bridge-sinking.The results of numerical simulation shows that bridge-sinking at the bottom of the porthole bridge can scatter the equivalent stress of die,so that the problem of early failure of die caused by cracking in this area can be solved fundamentally as well as prolonging the service of the die.At the same time,the speed of extrusion profiles and the production efficiency can be greatly improved in actual production.According to the results of numerical simulation,the original die and the bridge-sinking die were made and tested to extrude qualified profiles.