Simulation Study on the Influence of Bubbles and Electrical Erosion Particles on Cathode Electric Field Strength in EDM
In EDM,different electrode shape losses are generated at different spark locations.Imulates the distribution of cathode electric field strength before electric breakdown in the presence of working fluid,bubbles,and electrical erosionparticles between the electrodes,in order to discuss the influence of bubbles on the discharge occurrence and thus on the shape of electrode wear.Maxwell software is used to simulate the electrostatic field in the discharge gap,and obtained the effects and patterns of bubbles and electrical erosion particles on the sparkposition.The simulation results shows that bubbles have a protective effect on the wear of the cathode electrode.The larger bubble,the closer it is to the cathode surface,the lower electric field strength,and the stronger protective effect.The electrical erosion particles have an enhancement effect on the cathode field strength,and enhancement effect increases with the increase of concentration.The area around the bubble has the highest probability of discharge due to the high concentration of electrical erosion particles caused by surface tension of bubbles.Static bubbles can reduce the probability of discharge occurringin their coverage area,while moving bubbles cause discharge to occur along the trajectory of them.Different distribution states of bubbles will affect the worn shape of electrode.
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