Research On Mechanism And Application Of Electrical Discharge Machining With Synchronous Servo Double Electrodes For Non-conductive Engineering Ceramics

Electrical discharge machining with synchronous servo double electrodes is a new method developed by us. It removes the materials by spark energy and has the advantages of high efficiency, low costs, environmental pollution-free, and so on. Traditional theory of electrical discharge machining can hardly explain the mechanism of the new technology because of its complicated material erosion and unusual energy partition. For this reason, research on the mechanism and application of the technology has its important theoretical and engineering values.The mechanism and application of electrical discharge machining with synchronous servo double electrodes are studied by means of theoretical analysis combined with experimental research to improve the technology. Some achievements in discharge channel, heat partition, and temperature distribution are obtainedA theoretical and computational model is presented to study the ionization of electrical discharge machining with synchronous servo double electrodes using an electromagnetic particle-in-cell plus Monte Carlo collision method. Forming process of discharge channel is simulated and the detailed information about the distribution of charged particles and electromagnetic fields are obtained.The heat conduction process in non-conductive engineering ceramics and double electrodes is analyzed and a relatively rational model is built. The temperature fields of engineering ceramics, anode electrode and cathode electrode are simulated in 3 dimension and relationship of crater shape and discharge parameters through simulation under different pulse duration and discharge current conditions is analyzed.Experiments of single pulse discharge for electrical discharge machining with synchronous servo double electrodes is designed and some corresponding experiments are done. Effects of parameters such as pulse duration, discharge current and working fluid on material removal of non-conductive engineering ceramic, anode electrode and cathode electrode are discussed. The energy partition among non-conductive engineering ceramics, anode electrodes and cathode electrode is studied through experiments. The results show that energy partition varies little with the increase of pulse duration and discharge current.A model based on wavelet neural network is introduced to predict the process of electrical discharge machining with synchronous servo double electrodes. The simulation system is developed and experiments are carried out to verify the validity of the developed models. The results show that the wavelet neural network model fits the experiments result better.