Study On Filling And Solidification Of Metal Liquid In The Cavity Under Multi Dimensional Vibration

As an important forming method of mechanical parts,the improvement of its technology can greatly promote the development of national industry.In order to achieve the goal of "complex,thin wall and large",the new casting technology has been developed.Multi dimensional vibration casting technology is the further improvement of vibration casting technology.By changing the parameters such as degree of freedom,amplitude,frequency and so on,the filling ability of the metal liquid in the cavity can be improved effectively,and the effect of the metal liquid can be improved.Based on the study of domestic and foreign advanced technology and the theory of vibration casting based on EDEM-Fluent simulation software and ProCAST simulation of liquid metal flow in the cavity and shrinkage behavior by numerical and hydraulic experiments and simulation technology based on physical experiment of microcrystalline wax by multidimensional vibration device and die design.The main research work is as follows:(1)The vibration device is calculated,and the corresponding vibration parameters are obtained.The vibration parameters were screened by L shaped filling specimens,and the filling ability of the metal particles was investigated by the moving length of the particles in the L shaped filling specimens.Select the representative parameters,the choice model of EDEM-Fluent solid-liquid two-phase flow simulation,through the analysis of the particle movement in the filling process,the filling of particles under different vibration conditions.The number of particles in the cavity was investigated by the orthogonal experimental method.The sensitivity of the particles to the degree of freedom,vibration frequency and vibration amplitude was obtained by the range analysis method.(2)Considering that ProCAST can not be used to simulate the vibration casting,the influence of the casting parameters,such as pouring velocity,pouring temperature,and the temperature of the sand box,on the shrinkage porosity of the model is studied by selecting the pouring parameters of the three metal liquid.The orthogonal experiment method is used to obtain the influence of pouring parameters on the solidification shrinkage of metal liquid and the best pouring scheme is a reference for physical simulation experiment.The influence of the same parameters on the shrinkage porosity of the castings was studied by using the single variable method.(3)Simulation of vibration filling and vibration solidification process by hydraulic experiments and physical simulation experiments based on microcrystalline wax.The relationship between the vibration parameters and the state and time of the fluid filling is analyzed by using the same experimental scheme as the numerical simulation.The numerical simulation results are demonstrated by the digital camera.The simulation results are based on the ProCAST simulation.The best parameters and similarity criteria were obtained for the melting temperature of microcrystalline wax,so that it was similar to the prototype.In order to ensure the continuity of the experiment,vibration casting is carried out by means of vibration filling,and the volume of shrinkage is used to measure the volume of shrinkage.The variance analysis method is used to determine the vibration scheme.