外文翻譯---電火花線切割工藝進(jìn)給率的控制(完整版)
【正文】 the developed pulse discriminating and control system to monitor and control wire rupture suppression as well as maintain stable machining。 Moreover， many machining conditions such as workpiece properties(material，thickness)，machining settings(wire feed， table feed， flushing pressure，etc。developed a pulse discrimination system to study the characteristics of pulse trains in the wireEDM process。By means of the pulse discriminating and control system，the relationships between machine settings and sensing parameters are analyzed quantitatively。The theoretical consideration，that a small gap offers better conditions for a breakdown than a large gap leads therefore to shorter ignition delay times。D、Highfrequency parts of the burning voltage The practical investigations show that the spark voltage has a highfrequency part while the arc burning voltage does not have this one。There are three voltage levels 70，50 and 10V labeled as Vh，Vm and Vl，respectively。 As shown in this ，Vg is the gap voltage，Ig is the gap current，because the current measurement device is expensive，so the gap current is not considered in the input signal of the discriminating system。As shown in ，it is difficult to distinguish between an open circuit and a normal spark，and differentiate an arc spark from a short spark only by means of the three voltage levels Vl，Vm and Vh。Arc discharges and short circuits can be caused by poor flushing，gap contamination and short ionization because the spark debris can not be flushed away and it allow reionization of the dielectric。From the experimental results of process monitoring and control， the following conclusions are observed。盡管線切割在模具行業(yè)與制造業(yè)中發(fā)揮了重要的作用，尤其是對(duì)凸模和凹模的制造。盡管這些 自適應(yīng)性控制系統(tǒng)能被應(yīng)用到很大范圍的切削條件，但是當(dāng)有一個(gè)意想不到的干擾時(shí)如在切削一個(gè)階梯形的工件時(shí)，它們不能對(duì)距離條件進(jìn)行準(zhǔn)確的反應(yīng)。中間縫隙電壓的確定和距離寬度控制與其他方法相比比較容易控制。而且，影響電流和電壓測(cè)量的干擾可以替換為對(duì)時(shí)間的測(cè)量。第二部分是移動(dòng)控制部分，在間隙狀態(tài)檢測(cè)裝置，通過數(shù)字電路分壓器間隙中的高壓可以被變成電壓，有三個(gè)電壓值，它們分別是70、50和10（v），分別在標(biāo)為Vh、Vm、Vl。Ql，Qm 和 Qh是比較器的輸出狀態(tài)。因此，不僅間隙電壓的標(biāo)識(shí)而且時(shí)間段t1和tm都可被利用于識(shí)別系統(tǒng)來鑒定間隙狀態(tài)。當(dāng)間隙狀態(tài)被鑒定為空載，火花放電，弧形放電，短路中任何一種狀態(tài)時(shí), Do，Dn，Da 和 Ds則代表識(shí)別電路的輸出信號(hào)。圖3脈沖控制信號(hào)的時(shí)間表結(jié)論在這片論文中，為了鑒定脈沖間隙的狀態(tài)，開發(fā)了電火花線切割脈沖識(shí)別與控制系統(tǒng)，為了更多精確的線上量化脈沖序列分析，為了切削狀態(tài)檢測(cè)與工藝控制。表1 信號(hào)邏輯分析圖2脈沖識(shí)別信號(hào)的時(shí)間表電火花線切割加工過程中會(huì)出現(xiàn)四種不同的間隙狀態(tài)，它們是空載，火花放電，弧形放電，短路。當(dāng)P1處于高態(tài)和Q1處于高態(tài)時(shí)，時(shí)間在t1階段。這種裝置不但用于產(chǎn)生脈沖控制信號(hào)（），也用來區(qū)別間隙的狀態(tài)，個(gè)人微機(jī)常常用來用戶對(duì)接、數(shù)據(jù)的傳輸和計(jì)算。達(dá)到一個(gè)電壓參考值和電流參考值后時(shí)間間隔停止。B．引燃延遲時(shí)間 引燃延遲時(shí)間描述了縫隙間的擊穿電壓情況。這篇論文提出了一種新的計(jì)算機(jī)輔助脈沖識(shí)別和控制系統(tǒng)來監(jiān)測(cè)和控制線切割工藝。而且，很多切削條件如工件性能（材料，厚度），切削裝置（送絲，工作臺(tái)進(jìn)給，沖壓力等）和功率設(shè)置（脈沖，脈沖間隔等）對(duì)切削工藝有很大影響。The proportion of short circuits(short ratio)and the sparking frequency can be used to monitor and evaluate the gap conditio
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