Study on the Distribution of Removal Material of EDM in Deionized Water and Gas with Molecular Dynamics Simulation

Abstract

In this paper, in order to clarify the distribution of removal material in EDM, a single pulse discharge process in both deionized water and gas was simulated by using molecular dynamics method. The research results showed that compared with the discharge in gas, discharge in deionized water would generate expanding bubble and flowing liquid, which could have removing, carrying, cooling and blocking effects on removal material. In addition, it was found that immediately after the discharge was ignited, the velocity direction of removal material mainly directed to the gap. But as the time went on, the velocity direction of removal material gradually deviated from the gap. The change of distribution of velocity direction along with the time could reflect the material removal and returning process. It was also found that the range of volume distribution of removal debris in the gap after the end of discharge in deionized water was larger than that in gas, but the velocity of the removal debris was lower than that in gas.