| With the promotion of environmental protection in China and the enhancement of people's awareness of environmental protection,consumers are demanding more and more energy saving and emission reduction of automobiles.Its quality will have a direct impact on the smoothness and fuel consumption.Nowadays,most aluminum wheels are made by low pressure casting,which are cheap,beautiful and diversified,and have been widely used in cars.Nowadays,most aluminum wheels are made by low pressure casting,which are cheap,beautiful and diversified,and have been widely used in cars.The traditional hub forging technology is complex,high cost and low production efficiency.However,the quality of hub formed by liquid die forging process is lower than that of forging because of casting close to forgings,and the requirement of equipment tonnage is low,and the lightweight effect is higher than that of castings.Therefore,the liquid die forging process is of great significance in the production of aluminum alloy wheels.In this paper,liquid die forging technology,numerical simulation of forming process,A356 aluminum alloy and so on are introduced.The advantages and development prospect of aluminum alloy automobile hub using liquid forging process are described.According to the characteristics of liquid forging technology and the structural characteristics of automobile hub parts,the integral hub forging drawing is designed.The forming process of liquid die forging of aluminum alloy wheel hub was simulated by Pro-CAST software.The filling mold and liquid metal flow characteristics of the wheel were obtained under different filling conditions.The process parameters of liquid die forging could be determined by analyzing the simulation results.The main process parameters of aluminum alloy car wheel simulation are: filling speed(5mm/s?15mm/s?25mm/s),aluminum liquid filling temperature(680??690??700?),mold preheating temperature(250??350??450?),and 9 sets of orthogonal simulation experiments are designed.The simulation results show that the main parameters affecting the forming effect are filling speed,filling temperature,mold temperature and equipment tonnage in the process of liquid forging of aluminum alloy wheel hub.The simulation results of the main process parameters show that the filling speed has a great influence on the fillingeffect of liquid die forging.If the filling speed is too low,the filling will be incomplete,and if the speed is too fast,it will lead to the unstable flow of aluminum liquid during filling.The effect of filling temperature and die preheating temperature on the final filling of the wheel hub is also different.If the temperature of aluminum liquid filling mold is too high,it is easy to produce turbulent flow in the filling mold,although the temperature is too high.The filling temperature is too low and the hub filling is incomplete.Through the simulation and analysis of the filling process,a group of optimal liquid die forging parameters are summarized: the filling temperature of molten aluminum is 690 ?,the preheating temperature of the die is 350 ?,the filling speed is15 mm / s.On the basis of numerical simulation,the liquid die forging die for aluminum alloy wheel hub was designed,including liquid storage barrel,forming part,heating and heat preservation device.On the basis of the analysis of the experimental results and the problems in the experiment,the die structure is further optimized to make it more suitable for the production demand.It provides an important theoretical basis for the formulation and production of liquid die forging process for aluminum alloy automobile hub,and lays a foundation for later experiments and trial production. |
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