【作者】 张庆；

【导师】 汪炜；

【作者基本信息】 南京航空航天大学 ， 机械制造及其自动化， 2008， 硕士

【摘要】 微细电火花加工是一种微细特种加工工艺方法,在微机械以及微细结构加工领域具有举足轻重的地位。由于RC微能电源简单可靠,在微细电火花加工中得到了大量的应用。为了深入对微细电火花加工机理的认识,进一步提高微细电火花加工能力和效率,本文进行了相关的数值模拟和试验研究,在理论研究上和工程应用上取得了一些结论。本文主要研究内容如下:1.针对RC微能电源,建立了极间电场物理模型,采用数值模拟方法,探讨了电极形状、工作极性等对电场分布的影响,掌握了相关的电场分布规律。2.根据传热学理论,建立了微细电火花加工工件表面的热物理模型,采用数值模拟方法,考虑热物性参数、对流换热、相变潜热等随温度变化的影响因素,掌握了工件表面温度场分布,得出了微细电火花加工极间温度场的分布规律。3.在上述研究基础上,采用微细电解方法在线制作柱状钨电极,合理选择工艺参数,进行了微细电火花加工试验,并分析了电参数对加工尺度和效率的影响,获得了三组应用于不同加工场合下优化的电参数。更多还原

【Abstract】 Micro EDM(electric discharge machining) is a kind of special machining technique for micro machining .It has the pivotal status in the domain of micro machine as well as the micro structure processing . Micro-energy RC pulse generator obtains massive applications in micro EDM because of its simplicity and reliability .To raise the processing scale and the efficiency, this article has carried on the related numerical simulation and experimental study, and has made some progress in the fundamental research as well as the engineering application.Main content of this article is as follows:1. In view of micro-energy RC pulse generator, physical model of the electric field in the interelectrode has been established. Using the numerical simulation method, electric field distribution influenced by the electrode geometry and the machining polarly has been discussed. Also, the related electric field distributed rule of the micro EDM has been got.2. According to heat transfer theory, the thermal physical model of work piece’s surface in micro EDM has been established, using the numerical simulation method, considering some factors influenced along with the changing of temperature such as the thermal natural parameter, the heat convection, the latent heat and so on, the temperature field distribution of the work piece’s surface has been grasped, and distributed rule of the interelectrode temperature field in micro EDM has been obtained.3. Basing the research foundation above, using the micro electric chemical machining to manufacture columnar tungsten electrode on-site, choosing the reasonable technological parameter, micro EDM experiments have been carried on. Also, the influence to the working accuracy and the efficiency caused by electrical parameter has been analyzed. What’s more, three groups optimized electrical parameter have been obtained to apply in the different manufacturing places.更多还原