通过有限元数值模拟的方法,选取合适的热源模型、热边界条件,建立了液体介质中在45钢表面进行脉冲放电沉积TiC陶瓷涂层的热传导模型。采用有限元分析软件ANSYS对液相脉冲电火花放电表面温度场进行数值模拟,研究了脉冲电流参数对温度场和涂层表面形貌的影响。结果表明:工具电极的最高温度远高于工件的最高温度;温度均在轴向上降低较快,而在径向上分布较均匀;最高温度随加工电流的增加呈缓慢下降趋势;随脉冲电流的增大,沉积到工件上的火山口状涂层颗粒明显增大。

Heat transfer model of TiC ceramic coating on 45 steel prepared by electrical discharge coating in liquid was established through finite element numerical simulation method. Heat source model and thermal boundary conditions was selected. The temperature field on the surface of the electrodes was simulated by ANSYS software and the influence of pulse current parameters on the temperature field and coating morphology was researched. The results show that the maximum temperature on the tool electrode is far higher than that of the workpiece. The temperature reduces up quickly in the axis and distributes relatively uniformly in the radial, and the highest temperature declines slowly with the increase of the current. The coating particles like crater deposited on the workpiece are enlarged with the increase of pulse current.