Modeling And Simulation Of Liquid Metal Electrode Discharge Channel

The Electric Discharge Machining has the advantages of low force and high energy density.It is particularly suitable for ultra-precision machining on special materials being complicated structure.Accordingly,it has become the most promising method for micro machining to promote the development of manufacturing industry.Nevertheless,during discharging wears a small quanity of loss on the impact of electrical erosion when the electric spark discharges at the moment.The wear has a serious impact on working accuracy.In order to solve the problem of complicated micro electrode production and huge wear rate in the discharge machining process,this dissertation presents the method of the micro-electrospark machining of liquid metal soft electrode.In addition,it is explored the inner mechanism of the formation of liquid metal electrode discharge channel on the effect of multi-field coupling.For the liquid metal electrode,the dissertation argues that the starting condition of particle emission through the use of Monte Carlo collision theory and computing of the emission characteristics.It established a physical model of liquid metal electrode discharge channel by pulse discharge then it is easier to understand the forming process of it.It adopts PIC-MCC to simulate the movement of plasma,and it utilize successive over-relaxation method(SOR)and Buneman-Boris method to achieve the renew of space potential and plasma.It also makes the model more accurate by adding special boundary condition.For the model,it achieved the visualization by the modeling on MATLAB.The simulation results demonstrate the process of producing,transfer and stabilization on plasma channel.It also demonstrates the distribution of density,velocity and energy and the evolution process of energy.On the basis of the analysis of microscopic physical,the dissertation studies the influence that different energy size and distribution between anode and cathode.The simulation results also demonstrate that there is little effect of the energy proportion if the energy increased with the rise of voltage.The energy of anode is about 5.09% which the cathode is 12.24%.It argues that the reliability of electric spark machining method on liquid metal electrode and the validity of the model by verifying the distribution on liquid metal electrode and the validity of the model by verifying the distribution.