外文翻譯---電火花線切割工藝進(jìn)給率的控制(存儲版)
【正文】 e there exists an unexpected disturbance during machining。在線切割中金屬絲斷掉和不穩(wěn)定的切削條件會嚴(yán)重的減少切削效率和精度。下面四種工藝變量可以用來進(jìn)行進(jìn)給控制：A. 縫隙電壓 這個(gè)工藝特性是縫隙電壓的平均值。引燃延遲時(shí)間越大，發(fā)生電弧放電的危險(xiǎn)越大。一個(gè)足夠好的工藝分析決定臨界工藝狀態(tài)，通過工藝控制估計(jì)上述參數(shù)不是問題，新的進(jìn)給率控制必須在最短的時(shí)間內(nèi)適應(yīng)這些非穩(wěn)態(tài)。正如圖2顯示，Vg是間隙電壓，Ig是間隙電流，因?yàn)殡娏鳒y量裝置是比較昂貴的，所以間隙電流在識別系統(tǒng)輸入信號中不給與考慮。從圖2中可以看出，短路狀態(tài)t1階段是最長時(shí)間段與其他間隙狀態(tài)相比。根據(jù)被確認(rèn)的間隙狀態(tài)，控制部分可以用來實(shí)時(shí)調(diào)節(jié)進(jìn)給率。C、提出進(jìn)給率控制方案是為了改進(jìn)非正常切削狀態(tài)。B、在火花腐蝕切削中有四個(gè)工藝變量應(yīng)該進(jìn)行控制：中間間隙電壓、燃燒與延遲時(shí)間、間隙電壓高頻部分、擊穿電壓。弧形放電和短路可能會引起沖洗不良，間隙不均勻，電離不強(qiáng)，因?yàn)殡娀鸹ㄇ邢餍疾荒鼙粵_洗掉，它會形成二次放電的介質(zhì)。當(dāng)間隙狀態(tài)處于空載狀態(tài)時(shí)，t1和tm被測量，這時(shí)它們的值將被記錄，而且標(biāo)記分別為t1s和tms。在運(yùn)動控制裝置中， PCI—1240芯片通過一個(gè)容量為8KB雙埠隨機(jī)存取存儲器(RAM)連接到PCI總線，實(shí)現(xiàn)與奔騰微機(jī)交換數(shù)據(jù)，它常常通過C語言編程軟件來計(jì)算脈沖寬度。D．燃燒電壓的高頻部分 實(shí)際研究表明計(jì)算電壓有高頻部分，而電弧的燃燒電壓并沒有高頻部分，利用這一點(diǎn)工藝分析和進(jìn)給速率控制取得相當(dāng)好的切削效果。用這種方法，引燃延遲時(shí)間能作為進(jìn)給率控制的一個(gè)控制變量。根據(jù)以確定的距離狀態(tài)，提出通過實(shí)時(shí)調(diào)整進(jìn)給率來達(dá)到穩(wěn)定的切削狀態(tài)的控制方法被來了。廖等人開發(fā)了一種脈沖識別系統(tǒng)來研究線切割工藝中脈沖序列的特征。A bination of process variables has to be used for powerful control strategies。 shows the timing chart of the pulse control signals。According to the pulse discriminating signals as depicted in ，Gap states can be differentiated by using the following logical analysis As shown in table .1。Ql，Qm and Qh is high。The user interface was designed under the integrated development environment of Visual C++。Pulse discriminating and control systemA new pulse discriminating and control system has been developed for wireEDM process as shown in 。The measurement of the ignition delay of the dielectric breakdown has the advantage pared to other procedures that critical states the gap before the actual power pulse can be found，In addition，the disturbance afflicted current and voltage measurements are replaces by time measurement。This mean value depending on the different burning voltage levels of spark and arc as well as on the ignition delay time。Although these adaptive control systems can be applied to a wide rangeof machining conditions，they cannot respond to the gap conditions properly when there is an unexpected disturbance such as the condition of machining a stairshape workpiece。)and power settings(pulse ontime，pulse interval，etc。Liao et al。 This paper presents a new puteraided pulse discriminating and control system for process motoring and control in wireEDM。B、Ignition delay timeThe ignition delay time characterizes the conditions for the voltage breakdown of the gap。C、Voltage breakdown The voltage breakdown is characteristic of subsequent discharge because the slope of this breakdown is determined by the dominating mechanism of conducting。 In the Gap states examination module，a high voltage in the gap can be changed into a low voltage by
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