针对电火花放电时中心点移动的问题，通过将热源限定在一定的区域内，随机生成中心点，基于ANSYS建立了移动热源的有限元模型。分析了单脉冲放电过程中温度场在工件表面的分布及几何模型中心点温度随时间的变化规律。利用现有机床进行了单脉冲放电实验，比较了不同电流和脉冲参数下实验与仿真得到的放电坑半径，发现模型有着很好的预测精度，且仿真得到的加工趋势与实际加工相符合。%For the moving center of plasma produced by electrical discharge machining (EDM) ,by limiting the heat source to a certain region and generating discharge centers randomly ,a finite element model is established based on ANSYS. The temperature distribution on surface during discharge and the temperature center of geometry surface varying with time were analyzed. Single pulse discharge experiments were conducted using existing EDM machine. The radius of crater were compared by experiment and simulation under different machining currents and pulse-on duration. It was found that the model had good predicted accuracy and the simulated trend was consistent with the actual machining.
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