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Roman";mso-hansi-font-family:"Times New Roman"">电火花加工</span></b></p> <p class="MsoNormal"><span lang="EN-US"> </span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">电火花加工是在一定介质中，利用两极</span><span lang="EN-US">(</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">工具电极和工件电极</span><span lang="EN-US">)</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">之间脉冲性火花放电产生的电腐蚀现象对材料进行加工，以使零件的尺寸、形状和表面质量达到预定要求的加工方法。这种加工方法也被称为放电加工或电蚀加工。电火花加工主要包括电火花成形加工和电火花线切割加工，其能量来源形式是电能和热能。</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:宋体;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">电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:宋体; mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"">极间介质的电离击穿与形成放电通道</span></p> <p class="MsoNormal"><span lang="EN-US"> </span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">电火花加工原理如图巧</span><span lang="EN-US">.1</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">所示。工件接正极，工具接负极。工具电极和工件电极浸在液体介质中，脉冲电源不断发出电脉冲在工具和工件上，在两极间形成电场。由于电极的微观表面凹凸不平，当两极间的距离很小时，极间相对最近点电场强度最大，最先被击穿。液体介质被电离成电子和正离子，形成放电通道。如图</span><span lang="EN-US">15. 2</span><span style="font-family:宋体;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:宋体; mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"">舱量的转换、分布与传递</span></p> <p class="MsoNormal"><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">在电场力的作用下，通道内的电子高速奔向阳极，正离子奔向阴极，并且在通道内互相碰撞，放出大量的热，使电极表面放电处金属迅速熔化，甚至气化。</span></p> <p class="MsoNormal"><span lang="EN-US">3</span><span style="font-family:宋体; mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"">，电极材料的抛出</span></p> <p class="MsoNormal"><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">上述放电过程极为短促，具有爆炸性质。爆炸力把熔化和气化的金属抛出电极表面，被液体介质迅速冷却凝固，继而从两极间被冲走。</span></p> <p class="MsoNormal"><span lang="EN-US">4.</span><span style="font-family:宋体; mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"">极间介质的消电离</span></p> <p class="MsoNormal"><span lang="EN-US"> </span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">一次火花放电结束</span><span lang="EN-US">,</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">此后应有一段间隔时间，使间隙介质消除电离，恢复本次放电通道处间隙介质的绝缘强度</span><span lang="EN-US">,</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">以免总是重复在同一处发生放电而导致电弧放电〔》每次火花放电后使工件表面形成一个凹坑。在间隙自动调节器的控制下，工具电极在不断进给，脉冲放电将不断进行下去，无数个电蚀小坑重叠在工件上，最终工具电极的形状相当精确地“复印”在工件上。</span></p> <p class="MsoNormal"><span lang="EN-US">2. 2</span><span style="font-family:宋体; mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"">电火花成形加工的基本条件</span></p> <p class="MsoNormal"><span lang="EN-US">(I)</span><span style="font-family:宋体; mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"">工具电极和工件电极之间必须保持一定的间隙，一般是几个微米至数百个微米</span><span lang="EN-US">.</span></p> <p class="MsoNormal"><span lang="EN-US">(2)</span><span style="font-family:宋体; mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"">火花放电必须在绝缘介质中进行。</span></p> <p class="MsoNormal"><span lang="EN-US">(3)</span><span style="font-family:宋体; mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"">放电点局部区域的功率密度足够高，即放电通道要有很高的电流度</span><span lang="EN-US">(</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman"">一般为</span><span lang="EN-US">10<sup>5</sup>-10<sup>6</sup>A/cm}</span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">。这样，放电时所产生的热量，才足以使电极表面的局部金属瞬时熔化甚至</span></p> <p class="MsoNormal"><span lang="EN-US">(4)</span><span style="font-family:宋体; mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"">电火花放电是瞬时的脉冲性放电，放电时间的持续时间一般为</span><span lang="EN-US">10 <sup>-7</sup></span><span style="font-family:宋体;mso-ascii-font-family: "Times New Roman";mso-hansi-font-family:"Times New Roman"">一</span><span lang="EN-US">10 <sup>-3</sup> s </span><span style="font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">。</span></p> <p class="MsoNormal"><span lang="EN-US">(5)</span><span style="font-family:宋体; mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"">两次放电之间要有间隔时间。</span></p> <p class="MsoNormal" align="center" style="margin-top:4.5pt;margin-right:0cm; margin-bottom:7.5pt;margin-left:0cm;text-align:center;line-height:13.5pt; mso-pagination:widow-orphan;mso-outline-level:1"><b><span style="mso-bidi-font-size: 10.5pt;font-family:宋体;mso-bidi-font-family:宋体;mso-font-kerning:0pt">本文由</span></b><span lang="EN-US" style="mso-bidi-font-size:10.5pt;font-family:宋体;mso-bidi-font-family: 宋体;mso-font-kerning:0pt;mso-bidi-font-weight:bold"> </span><b><u><span 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