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機(jī)床是由機(jī)械和電氣兩部分組成，在設(shè)計(jì)總體方案時(shí)應(yīng)從機(jī)電兩方面來考慮機(jī)床各種功能的實(shí)施方案，數(shù)控機(jī)床的機(jī)械要求和數(shù)控系統(tǒng)的功能都很復(fù)雜，所以更應(yīng)機(jī)電溝通，揚(yáng)長(zhǎng)避短。機(jī)床控制系統(tǒng)選件、裝配、程序編制及操作都應(yīng)該比較合理，精度和穩(wěn)定性都必須滿足使用要求。同時(shí)為便于調(diào)試和檢修，各項(xiàng)操作均設(shè)手動(dòng)功能，如手動(dòng)各軸快慢移動(dòng)、主軸高低速旋轉(zhuǎn)、切削液及潤(rùn)滑開關(guān)等。PLC按照邏輯條件進(jìn)行順序動(dòng)作或按照時(shí)序動(dòng)作，另外還有與順序、時(shí)序無關(guān)的按照邏輯關(guān)系進(jìn)行聯(lián)鎖保護(hù)動(dòng)作的控制，PLC發(fā)展成了取代繼電器線路和進(jìn)行順序控制的主要產(chǎn)品,在機(jī)床的電氣控制中應(yīng)用也比較普遍。
在實(shí)際控制中如何既能提高定位速度，同時(shí)又能保證定位精度是一項(xiàng)需要認(rèn)真考慮并切實(shí)加以解決的問題。精度是機(jī)床必須保證的一項(xiàng)性能指標(biāo)。位置伺服控制系統(tǒng)的位置精度在很大程度上決定了數(shù)控機(jī)床的加工精度。因此位置精度是一個(gè)極為重要的指標(biāo)。為了保證有足夠的位置精度，一方面是正確選擇系統(tǒng)中開環(huán)放大倍數(shù)的大小，另一方面是對(duì)位置檢測(cè)元件提出精度的要求。因?yàn)樵陂]環(huán)控制系統(tǒng)中，對(duì)于檢測(cè)元件本身的誤差和被檢測(cè)量的偏差是很難區(qū)分出來的，反饋檢測(cè)元件的精度對(duì)系統(tǒng)的精度常常起著決定性的作用。高精度的控制系統(tǒng)必須有高精度的檢測(cè)元件作為保證。當(dāng)現(xiàn)場(chǎng)條件發(fā)生變化時(shí)，系統(tǒng)的某些控制參數(shù)必須能作相應(yīng)的修改，為滿足生產(chǎn)的連續(xù)性，要求對(duì)控制系統(tǒng)可變參數(shù)的修改應(yīng)在線進(jìn)行。盡管使用編程器可以方便快速地改變?cè)O(shè)定參數(shù)，但編程器一般不能交現(xiàn)場(chǎng)操作人員使用;所以，應(yīng)考慮開發(fā)其他簡(jiǎn)便有效的方法實(shí)現(xiàn)PLC的可變控制參數(shù)的在線修改。另外為了防止電壓過高損壞PLC，電源輸入端加上壓敏電阻。為了防止過熱, PLC不許安裝在變壓器等發(fā)熱元件的正上方，變頻器與PLC、伺服驅(qū)動(dòng)器等保持一定距離。在元件間留有適當(dāng)?shù)目障?，以便散熱，并且在配電箱上安裝風(fēng)扇降溫。此外，為保證控制系統(tǒng)的安全與穩(wěn)定運(yùn)行，還應(yīng)解決控制系統(tǒng)的安全保護(hù)問題，如系統(tǒng)的行程保護(hù)、故障元件的自動(dòng)檢測(cè)等。
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