电火花加工单脉冲放电通道直径扩展规律研究

Single Pulse Discharge Channel Expansion Laws of EDM

电火花加工的加工表面是由一系列的脉冲放电凹坑叠加而成的,因此研究单脉冲放电通道直径的扩展规律,对研究电火花加工的工艺规律以及加工表面质量预测等具有非常重要的意义。研究脉冲放电通道的形成与扩展机理,讨论电压、极值电流、脉宽等放电参数对放电通道直径扩展的影响,并根据理论推导建立了单脉冲放电通道直径扩展的数学模型。以煤油作为电介质工作液开展了单脉冲放电试验,使用超景深显微镜对单脉冲放电凹坑的直径进行了测量,并把测量得到的单脉冲放电直径数据代入建立的数学模型进行回归求解。回归公式的计算值与试验测量得到的单脉冲直径数据吻合度较高。

The surface of electrical discharge machining （EDM） processing is consisted of a series of discharge pits. The single pulse discharge rule has very important significance to the research of the electrical discharge machining technology and surface quality prediction. The pulse discharge channel formation and expansion mechanism is studied and the influence of discharge parameters on the discharge channel expanding is discussed. A mathematical model is established. Pulse discharge experiments are carried out in kerosene medium and the pulse discharge pits diameters are measured. Model of single pulse discharge diameter according to the established mathematical is regressed, and the regression formula calculation values and experimental values agree well by comparing.