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產(chǎn)品描述:PLC系統(tǒng)組成及位控單元的工作原理 本研究所利用的PLC系統(tǒng)的組成包括如下七大模塊:電源,CPU,位控單元,I/O單元,A/D,D/A單元,如圖1所示。其中位控單元的主功能是當(dāng)步進(jìn)電機(jī)(或伺服電機(jī))與電機(jī)驅(qū)動器聯(lián)結(jié)時,輸出脈沖序列控制電機(jī)的轉(zhuǎn)速與轉(zhuǎn)角。進(jìn)給機(jī)構(gòu)可以是2軸型,也可以是4軸型。本文采用的是前者,即滾珠絲杠的橫向進(jìn)給與縱向進(jìn)給,如圖2所示。具體地說,位控單元實(shí)現(xiàn)速度以及位置的控制方法有多種,如E點(diǎn)控制(單速度控制),如圖3(a)所示;P點(diǎn)控制(多級速度控制);線性加/減速和S型加/減速,(a),(b)為線性加/減速,S型如。除此之外還有位置控制和相對位置控制等。表1給出了E點(diǎn)控制不同模式的控制碼(P點(diǎn)與其相同)。
PLC控制原理 PLC可以控制變頻器、傳感器、步進(jìn)電機(jī)??偪刂瞥绦蛄鞒虉D如圖5所示。其中兩個步進(jìn)電機(jī)是利用PLC的位控單元控制的。在進(jìn)行精密磨削過程中,橫向進(jìn)給將是十分重要的,PLC的位控單元能較精確地控制步進(jìn)電機(jī)的轉(zhuǎn)角,從而使?jié)L珠絲杠獲得精確定位。由于PLC位控單元的控制方法有多種,對于磨削加工來講,橫向進(jìn)給量不能大于215μm,通過實(shí)驗(yàn)的方法可以找出*方案。這里只通過一種控制方法來說明位控單元的具體應(yīng)用。首先,設(shè)置原點(diǎn),利用光柵尺粗對刀,測量出對刀位置距原點(diǎn)的距離。為防滾珠絲杠出現(xiàn)爬行現(xiàn)象,工作臺從原點(diǎn)出發(fā),經(jīng)過一段距離以后開始自動加/減速。此時,只要給定起始速度,目標(biāo)速度,加速/減速時間以及位置要求值,并設(shè) 定控制碼即可實(shí)現(xiàn)上述功能。
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