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<li><a title="數(shù)控文章" href="/bethel/news">數(shù)控文章</a></li> </ol> </nav> </div> <!--/sub_menu--><!-- 面包屑導(dǎo)航結(jié)束 --> <!-- 頁面標(biāo)題開始 --> <div id="n1l1njb9b" class="title"> <h3><a>談?wù)撾娀鸹庸ぜ捌浠驹?small></small></a></h3> </div> <!-- 頁面標(biāo)題結(jié)束 --> <hr class="featurette-divider"> <!-- 中部開始 --> <div id="n1l1njb9b" class="container"> <!-- 正文 --> <div id="n1l1njb9b" class="lead" id="print"> <p> <b><span lang="EN-US">15. 2</span></b><b><span style="font-family: 宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"">電火花加工</span></b></p> <p class="MsoNormal"><span lang="EN-US"> </span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">電火花加工是在一定介質(zhì)中，利用兩極</span><span lang="EN-US">(</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">工具電極和工件電極</span><span lang="EN-US">)</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">之間脈沖性火花放電產(chǎn)生的電腐蝕現(xiàn)象對材料進(jìn)行加工，以使零件的尺寸、形狀和表面質(zhì)量達(dá)到預(yù)定要求的加工方法。這種加工方法也被稱為放電加工或電蝕加工。電火花加工主要包括電火花成形加工和電火花線切割加工，其能量來源形式是電能和熱能。</span></p> <p class="MsoNormal"><st1:chsdate isrocdate="False" islunardate="False" day="30" month="12" year="1899" w:st="on"><b><span lang="EN-US">15. 2. 1</span></b></st1:chsdate><b><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">電火花加工的基本原理</span><span lang="EN-US"><o:p></o:p></span></b></p> <p class="MsoNormal"><span lang="EN-US">1.</span><span style="font-family:宋體; mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"">極間介質(zhì)的電離擊穿與形成放電通道</span></p> <p class="MsoNormal"><span lang="EN-US"> </span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">電火花加工原理如圖巧</span><span lang="EN-US">.1</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">所示。工件接正極，工具接負(fù)極。工具電極和工件電極浸在液體介質(zhì)中，脈沖電源不斷發(fā)出電脈沖在工具和工件上，在兩極間形成電場。由于電極的微觀表面凹凸不平，當(dāng)兩極間的距離很小時，極間相對最近點(diǎn)電場強(qiáng)度最大，最先被擊穿。液體介質(zhì)被電離成電子和正離子，形成放電通道。如圖</span><span lang="EN-US">15. 2</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">所示。</span></p> <p class="MsoNormal"><span lang="EN-US"><img src="/upload/images/201409/1410104087841.jpg" alt="" /><br /> <!--[endif]--></span></p> <p class="MsoNormal"><span lang="EN-US">2.</span><span style="font-family:宋體; mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"">艙量的轉(zhuǎn)換、分布與傳遞</span></p> <p class="MsoNormal"><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">在電場力的作用下，通道內(nèi)的電子高速奔向陽極，正離子奔向陰極，并且在通道內(nèi)互相碰撞，放出大量的熱，使電極表面放電處金屬迅速熔化，甚至氣化。</span></p> <p class="MsoNormal"><span lang="EN-US">3</span><span style="font-family:宋體; mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"">，電極材料的拋出</span></p> <p class="MsoNormal"><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">上述放電過程極為短促，具有爆炸性質(zhì)。爆炸力把熔化和氣化的金屬拋出電極表面，被液體介質(zhì)迅速冷卻凝固，繼而從兩極間被沖走。</span></p> <p class="MsoNormal"><span lang="EN-US">4.</span><span style="font-family:宋體; mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"">極間介質(zhì)的消電離</span></p> <p class="MsoNormal"><span lang="EN-US"> </span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">一次火花放電結(jié)束</span><span lang="EN-US">,</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">此后應(yīng)有一段間隔時間，使間隙介質(zhì)消除電離，恢復(fù)本次放電通道處間隙介質(zhì)的絕緣強(qiáng)度</span><span lang="EN-US">,</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">以免總是重復(fù)在同一處發(fā)生放電而導(dǎo)致電弧放電〔》每次火花放電后使工件表面形成一個凹坑。在間隙自動調(diào)節(jié)器的控制下，工具電極在不斷進(jìn)給，脈沖放電將不斷進(jìn)行下去，無數(shù)個電蝕小坑重疊在工件上，最終工具電極的形狀相當(dāng)精確地“復(fù)印”在工件上。</span></p> <p class="MsoNormal"><span lang="EN-US">2. 2</span><span style="font-family:宋體; mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"">電火花成形加工的基本條件</span></p> <p class="MsoNormal"><span lang="EN-US">(I)</span><span style="font-family:宋體; mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"">工具電極和工件電極之間必須保持一定的間隙，一般是幾個微米至數(shù)百個微米</span><span lang="EN-US">.</span></p> <p class="MsoNormal"><span lang="EN-US">(2)</span><span style="font-family:宋體; mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"">火花放電必須在絕緣介質(zhì)中進(jìn)行。</span></p> <p class="MsoNormal"><span lang="EN-US">(3)</span><span style="font-family:宋體; mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"">放電點(diǎn)局部區(qū)域的功率密度足夠高，即放電通道要有很高的電流度</span><span lang="EN-US">(</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">一般為</span><span lang="EN-US">10<sup>5</sup>-10<sup>6</sup>A/cm}</span><span style="font-family:宋體;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">。這樣，放電時所產(chǎn)生的熱量，才足以使電極表面的局部金屬瞬時熔化甚至</span></p> <p class="MsoNormal"><span lang="EN-US">(4)</span><span style="font-family:宋體; mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"">電火花放電是瞬時的脈沖性放電，放電時間的持續(xù)時間一般為</span><span lang="EN-US">10 <sup>-7</sup></span><span style="font-family:宋體;mso-ascii-font-family: "Times New Roman";mso-hansi-font-family:"Times New Roman"">一</span><span lang="EN-US">10 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