6ES75225HF000AB0
6ES75225HF000AB0
6ES75225HF000AB0
6ES75225HF000AB0
6ES75225HF000AB0
磨削機主要由1臺永宏FBs-44MN系列PLC，1套三菱MR-J2S系列交流伺服系統(tǒng)，3臺三菱FR-E540系列變頻器，1臺WEINVIEW的510T，1個4DA模塊組成。其核心是可編程控制器，它的輸出部分主要用于控制伺服和驅(qū)動電機。其輸人部分主要接收各類保護繼電器的動作信號。整個設計具體可分為以下4部分:①采用PLC：FBs-44MN完成檢測(計算出最佳的進刀量)，自動磨削等工序。②利用伺服實現(xiàn)對磨削進刀量的雙閉環(huán)控制。③利用內(nèi)部計數(shù)器和光電開關讀取橫向拖板移動距離。④采用觸摸屏實現(xiàn)了更為方便、友好的人機通訊。
2.2 PLC控制系統(tǒng)構(gòu)成
控制系統(tǒng)由可編程邏輯控制器FBs-44MN、伺服、光電接近開關和D/A擴展模塊以及觸摸屏元件組成，實現(xiàn)磨削過程中基本邏輯動作、檢測、伺服閉環(huán)控制和人機通訊四大功能
1)伺服和定位控制器的結(jié)合模塊:磨削機要求絲杠上的刀盤在加工前后必須停拖板電機在相同的位置，以便下一加工循環(huán)，否則將造成刀具或工件損壞。準確定位在普通繼電器控制的鼠籠式交流電機上實現(xiàn)起來比較麻煩，我們采取伺服系統(tǒng)來實現(xiàn)定位，引人速度負反饋消除了外界參數(shù)變化和擾動對系統(tǒng)狀態(tài)的影響，使該系統(tǒng)具有動態(tài)響應快、定位精度高、系統(tǒng)穩(wěn)定性好等特點。為了在工作過程中使精度控制在規(guī)定的誤差以內(nèi)，進刀距離通過檢測采用閉環(huán)跟蹤控制。首先是用FBs-44MN讀取檢測時探頭接觸版輥的讀數(shù)，并根據(jù)公式顯示出版輥的直徑最大，最小，平均值(與制定合適的切削量有關)，然后用此時的伺服讀數(shù)減去探頭讀數(shù)，再加上需要的切削量求出比較精確的進刀量，最后開始整個自動磨削過程。FBs-44MN作為智能化的定位控制器按用戶編制的定位程序向驅(qū)動器發(fā)出定位脈沖、運行方向等，信號驅(qū)動器按這些控制信號驅(qū)動伺服電機帶動滾珠絲杠進行定位，對于伺服電機，有伺服準備、伺服結(jié)束和零位三個信號反饋，外部設定用數(shù)字開關可將定位點位置和速度等數(shù)值送人定位單元，定位單元通過總線連接到FX系列PLC擴展口上，成為PLC控制系統(tǒng)中的定位智能控制環(huán)節(jié)，在定位單元內(nèi)，常量的設置與監(jiān)控、參數(shù)的改變可以通過使用連接到PLC上的數(shù)據(jù)存取單元完成，因此可以在運行過程中由PLC指定模塊號(這里4DA是1號模塊)，傳送定位速度等數(shù)據(jù)，并能在PLC中監(jiān)視GM的實時定位信號及運行或停止狀態(tài)。相應地在PLC中分配有輸人繼電器，輸出繼電器，輔助繼電器，以及特殊輔助繼電器等設備。
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