中文摘要：

电极旋转是提高微孔电火花加工效率的有效手段,而极间的工作液作为放电介质,其运动状态是影响微孔电火花加工放电状态和加工效率的关键因素之一.依据粘性流体运动学偏微分方程建立了旋转电极周围工作液的机理模型,应用FLUENT软件对此模型进行了流场计算与模拟,结果显示放电间隙内工作液为层流状态.结合得到的工作液流动规律,应用流场中微粒动平衡理论对电蚀产物颗粒的分布规律进行研究,发现电蚀产物颗粒在间隙内的分布只与颗粒直径有关.由此提出了通过调整放电参数来改变颗粒直径进而改善间隙放电状态的新方法,为合理选择放电参数提供了理论依据.

英文摘要：

Electrode rotation is an effective method to improve machining efficiency in micro-EDM （electrical discharge machining） process. The motion state of working fluid,which surrounds the revolving electrode as dielectric,is the key influence factor for micro-EDM discharge status and machining efficiency. Based on the kinematic partial differential equation of viscous fluid,the mechanism model of working fluid around the revolving electrode is proposed. Moreover,calculation and simulation of flow field are conducted by FLUENT software. The experimental results indicate that the flow status of working fluid in discharge gap is laminar flow. According to the obtained flowing law and dynamic balance theory of particle in the flow field,it is found that the distribution of interelectrode discharge debris is only related to the debris size. A new way of changing the debris size by adjusting discharge parameters is presented to improve the gap discharge status,which provides the basic theory for choosing the proper discharge parameters.