摘要--微細(xì)電火花加工數(shù)值模擬

1、<p>　　微細(xì)電火花加工數(shù)值模擬</p><p>　　摘要：微細(xì)電火花加工是一種微細(xì)特種加工工藝方法，在微機(jī)械以及微細(xì)結(jié)構(gòu)加工領(lǐng)域具有舉足輕重的地位。由于RC微能電源簡(jiǎn)單可靠，在微細(xì)電火花加工中得到了大量的應(yīng)用。為了深入對(duì)微細(xì)電火花加工機(jī)理的認(rèn)識(shí)，進(jìn)一步提高微細(xì)電火花加工能力和效率，本文進(jìn)行了相關(guān)的數(shù)值模擬和試驗(yàn)研究，在理論研究上和工程應(yīng)用上取得了一些結(jié)論。</p><p>　

2、　本文主要研究?jī)?nèi)容如下：</p><p>　　1．針對(duì)RC微能電源，建立了極間電場(chǎng)物理模型，采用數(shù)值模擬方法，探討了電極形狀、工作極性等對(duì)電場(chǎng)分布的影響，掌握了相關(guān)的電場(chǎng)分布規(guī)律。</p><p>　　2．根據(jù)傳熱學(xué)理論，建立了微細(xì)電火花加工工件表面的熱物理模型，采用數(shù)值模擬方法，考慮熱物性參數(shù)、對(duì)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(chǎng)分布，得出了微細(xì)電火花加工極間溫

3、度場(chǎng)的分布規(guī)律。</p><p>　　3．在上述研究基礎(chǔ)上，采用微細(xì)電解方法在線制作柱狀鎢電極，合理選擇工藝參數(shù)，進(jìn)行了微細(xì)電火花加工試驗(yàn)，并分析了電參數(shù)對(duì)加工尺度和效率的影響，獲得了三組應(yīng)用于不同加工場(chǎng)合下優(yōu)化的電參數(shù)。</p><p>　　關(guān)鍵詞：微細(xì)電火花加工，加工能力，效率，數(shù)值模擬，電場(chǎng)，溫度場(chǎng)，電參數(shù)</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