Numerical Simulation And Process Optimization Of Die Casting Process

Die casting technology has been widely applied in the production of key components in electronics,automobile,aerospace and other fields.The use of numerical simulation technology to design die casting mold and die casting process can effectively improve the quality of die casting parts and shorten the product development cycle.It is a main trend of the development of die casting technology.The pouring temperature is very important for the whole die casting process.If the pouring temperature is too high,the gas content of the liquid metal will increase.This will cause porosity defects,which will cause the grain size of magnesium alloy to be coarse,and even lead to die adhesion and increase the die loss.If the pouring temperature is too low,the filling performance of liquid metal will become worse,so that there will appear cold insulation or insufficient pouring.The temperature field in the feeding stage is studied,and the loss temperature of liquid metal in this process is about 3?.Therefore,the pouring temperature of the castings that is more sensitive to pouring temperature should be improved by 3?.The flow behavior and entrainment tendency of liquid metal during die casting were studied and the optimum parameters of slow injection were determined.The flow models previously made by researchers generally ignore the heat transfer and solidification of liquid metal,so it isn't truly reflect the flow behavior of liquid metal in chamber.So the heat transfer and solidification of liquid metal are considered in this model.The flow behavior of liquid metal under different punch velocities was simulated,and the optimal slow injection velocity was calculated under this condition.Through the analysis and numerical simulation of the die casting process,the reasonable gating system is determined.The cause of gas entrainment in the medium cavity during actual die casting process is explained.The model of the gating system is imported into the Anycasting software.The secondary injection velocity,the pouring temperature and the mold temperature in continuous production are taken as the parameters,and the shrinkage porosity and air entrainment are taken as the criteria.The experiment is used to analyze the simulation results and the optimum technological parameters are obtained.