Numerical Simulation And Process Research On Hot Extrusion Forming Of 5A06 Aluminum Alloy Center Frame

An aluminum alloy center frame has the characteristics of complex and special shape and large difference in section size.In the past,the factory mainly used machining,casting and forging methods to process it.On the premise of mass production,the utilization of machined materials is low and the working hours are long,while the mechanical properties of cast products are poor,which is difficult to meet the use requirements.Therefore,after analyzing the structure and size of the products,it is decided to use the hot extrusion process for processing,and the numerical simulation method is adopted.Compared with the traditional method,it can reduce the trial and error cost in the experimental process and shorten the product research and development cycle,Finally,reduce the forming pressure,reduce the production cost and improve the productivity.Hot extrusion is a process of forming metal billets by heating them to recrystallization temperature.Extrusion temperature,speed,die structure,friction coefficient and other factors will affect the extrusion process to varying degrees.This article first analyze the center frame structure,determined the mold structure,and then use to simulate the DEFORM software,the analysis of different die structure and extrusion speed,the billet initial temperature and the influence of friction coefficient on the extrusion forming process,in the process of extrusion forming speed,forming load,equivalent stress analysis,the parameters such as temperature,Determine the appropriate die structure and technological parameters,through the simulation results can see show in center frame in the process of hot extrusion billet internal and there are many differences between the surface of metal liquid,the inside of the metal flow velocity is larger,outflow die forming straight wall part,surface layer and the top metal liquidity is poorer,upsetting forming the base part;It is found that the forming load of the biconical die is the smallest,and the larger the die Angle of the biconical die is,the smaller the extrusion load is.It is found that with the increase of extrusion temperature,the peak value of equivalent stress decreases,the deformation resistance decreases and the extrusion load decreases.The simulation results of three extrusion speeds of 1mm/s,2mm/s and 3mm/s and the friction coefficients of 0.1,0.2 and 0.3 show that the change of extrusion speed will change the trend of forming load,and the greater the extrusion speed and friction coefficient,the greater the extrusion load.Finally,the initial temperature of billet is 460?,extrusion speed is 1mm/s and friction coefficient is 0.3.Finally,experiments are carried out to verify the feasibility of the process.The experimental structure is basically the same as the numerical simulation results.The grains of the extruded parts are obviously refined.Through the measurement of tensile strength and hardness,the mechanical properties of the extruded products are determined to meet the product requirements.The simulation and experimental research in this paper achieve the purpose of saving materials and efficient production,and has certain theoretical significance and practical prospects.