摘要--微細電火花加工數值模擬

1、<p>　　微細電火花加工數值模擬</p><p>　　摘要：微細電火花加工是一種微細特種加工工藝方法，在微機械以及微細結構加工領域具有舉足輕重的地位。由于RC微能電源簡單可靠，在微細電火花加工中得到了大量的應用。為了深入對微細電火花加工機理的認識，進一步提高微細電火花加工能力和效率，本文進行了相關的數值模擬和試驗研究，在理論研究上和工程應用上取得了一些結論。</p><p>　

2、　本文主要研究內容如下：</p><p>　　1．針對RC微能電源，建立了極間電場物理模型，采用數值模擬方法，探討了電極形狀、工作極性等對電場分布的影響，掌握了相關的電場分布規(guī)律。</p><p>　　2．根據傳熱學理論，建立了微細電火花加工工件表面的熱物理模型，采用數值模擬方法，考慮熱物性參數、對流換熱、相變潛熱等隨溫度變化的影響因素，掌握了工件表面溫度場分布，得出了微細電火花加工極間溫

3、度場的分布規(guī)律。</p><p>　　3．在上述研究基礎上，采用微細電解方法在線制作柱狀鎢電極，合理選擇工藝參數，進行了微細電火花加工試驗，并分析了電參數對加工尺度和效率的影響，獲得了三組應用于不同加工場合下優(yōu)化的電參數。</p><p>　　關鍵詞：微細電火花加工，加工能力，效率，數值模擬，電場，溫度場，電參數</p><p>　　Numerical simula

4、tion of micro EDM</p><p>　　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 t

5、he 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 carr

6、ied on the related numerical simulation and experimental study, and has made some progress in the fu</p><p>　　Main content of this article is as follows:</p><p>　　1. In view of micro-energy RC p

7、ulse 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 p

8、olarly has been discussed. Also, the related electric field distributed rule of the micro EDM has been got.</p><p>　　2. According to heat transfer theory, the thermal physical model of work piece’s surface i

9、n 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 h

10、eat 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.</p><p>　　3. Basing

11、 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.

12、 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 manu