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<p>Aiming at the insufficient understanding of the corrosion mechanism in magnetic field assisted electrical discharge machining (MF-EDM), the influence mechanism of magnetic field on discharge corrosion is explored based on the electron drift rule in the composite field. By simplifying the movement of the plasma arc to align with the offset distance of the electron position, and by equating changes in thermal dynamics—such as arc pressure and recoil vapor pressure at the melting metal interface—to the deflection angle of electron velocity direction, a thermo-hydraulic coupling simulation model was ultimately developed. This model was then used to simulate the discharge erosion process in both air and flowing water media. Finally, a magnetic field assisted monopulse discharge experiment was conducted. The results indicate that the magnetic field can enlarge the diameter of discharge crater, slightly reduce the crater depth, and cause the molten metal to burst and boil earlier, thereby accelerating the corrosion rate. The shapes and sizes of the craters obtained from both simulation and experiment exhibit good consistency, with a diameter error of approximately 2% and a depth error of approximately 1%.</p>

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Simulation and experimental study of single crater erosion of high magnetic field assist EDM based on electron drift

  • 期刊论文

  • 发表日期：

    2026年5月14日

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  • Jingwei Liang,
  • Yan Wang,
  • Lihui Zhao,
  • Kui Li,
  • Yizhang Chen

摘要

Aiming at the insufficient understanding of the corrosion mechanism in magnetic field assisted electrical discharge machining (MF-EDM), the influence mechanism of magnetic field on discharge corrosion is explored based on the electron drift rule in the composite field. By simplifying the movement of the plasma arc to align with the offset distance of the electron position, and by equating changes in thermal dynamics—such as arc pressure and recoil vapor pressure at the melting metal interface—to the deflection angle of electron velocity direction, a thermo-hydraulic coupling simulation model was ultimately developed. This model was then used to simulate the discharge erosion process in both air and flowing water media. Finally, a magnetic field assisted monopulse discharge experiment was conducted. The results indicate that the magnetic field can enlarge the diameter of discharge crater, slightly reduce the crater depth, and cause the molten metal to burst and boil earlier, thereby accelerating the corrosion rate. The shapes and sizes of the craters obtained from both simulation and experiment exhibit good consistency, with a diameter error of approximately 2% and a depth error of approximately 1%.