數(shù)控專(zhuān)業(yè)外文文獻(xiàn)翻譯-外文翻譯--數(shù)控機(jī)床開(kāi)環(huán)控制伺服系統(tǒng)與數(shù)控生產(chǎn)設(shè)備

錄 譯文： of he is is is by of 1） he is so on to As is As a of of to be to to by up is as to to to on up 2） of by in We in in of to we to is so on of of In D, so on D, D, D, D on We AD in M AD AD/AM I) on C in on of to At to on on C G, on an on in to l to is an (on as of oto do to to to in to of to he by in in as to to on to to a by of 3） of by to be as is as by NC on to On as a in is is it a by of 4） on of so on to to in to is a of in is by of in an to a of a or of is to is C It is to to of C A of ·of P he is is of is In to of a to on is of in of of NC is is a in of of of it of or is of C It is In of of as as to F of in In of is by on of at at in to as in an as or is or to to is in be in In as at as it a of is on or by of In is of of of or be in C a of to in a a C ·of or to or a in CU is is a is to be in C. in is to of is to be of or in to a be be to to be to of a of a by of of of of is of a of by is to by in to A of is in be a by of C of a of a in to of as as in be by C A of a of C to a C be by an on or an be or to to so to of or of or to on/of so of of on of to be A is of to as of or a is on it is to be be of be by to do in is is in of of is of of to be in it to C in 950s is in is · of to is of a of as · of in of of or to · is of a C on of of in of of in of be by or of be by a of on a or by an as or 1 on J. 1,999, 18 (1): 14l 144. 2 Du ,M)/AM J. 1998, 28 (5): 5155. 3 , on . to 1,999, 28 (2): 12 文： 數(shù)控機(jī)床開(kāi)環(huán)控制伺服系統(tǒng)與數(shù)控生產(chǎn)設(shè)備 摘要 開(kāi)環(huán)系統(tǒng)的優(yōu)點(diǎn)是系統(tǒng)簡(jiǎn)單、成本低，但缺點(diǎn)是精度低。反向間隙、絲杠螺距誤差、起停誤差等都會(huì)影響定位精度。下面幾種改進(jìn)措施可以使定位精度明顯改善。 關(guān)鍵字：數(shù)控系統(tǒng)、開(kāi)環(huán)系統(tǒng) 1） 反向間隙誤 差補(bǔ)償 數(shù)控機(jī)床加工刀具與工件的相對(duì)運(yùn)動(dòng)是依靠驅(qū)動(dòng)裝置帶動(dòng)齒輪、絲杠轉(zhuǎn)動(dòng)，從而推動(dòng)工作臺(tái)面等移動(dòng)部件產(chǎn)生位移來(lái)實(shí)現(xiàn)的。作為傳統(tǒng)元件的齒輪、絲杠盡管制造精度很高，但總免不了存在間隙。由于這種間隙存在，當(dāng)運(yùn)動(dòng)的方向改變時(shí)，開(kāi)始段時(shí)間必然會(huì)引起驅(qū)動(dòng)元件的空走，出現(xiàn)指令脈沖推不動(dòng)執(zhí)行元件的局面。這就影響了機(jī)床的加工精度，即指令脈沖與實(shí)際進(jìn)給步數(shù)不相符合，產(chǎn)生加工誤差 因此，開(kāi)環(huán)數(shù)控系統(tǒng)一般都設(shè)置有反向間隙誤差補(bǔ)償功能，用以補(bǔ)足空走的步數(shù)反向間隙差補(bǔ)償就是首先實(shí)測(cè)反向進(jìn)給的誤差，把它折算成脈沖當(dāng)量數(shù)，作為間隙補(bǔ)償子程 序的輸出量，當(dāng)計(jì)算機(jī)判斷出現(xiàn)的指令為反向運(yùn)動(dòng)時(shí)，隨即調(diào)用間隙補(bǔ)償子程序，通過(guò)輸出補(bǔ)償脈沖消除反向間隙后再進(jìn)行正常的插補(bǔ)運(yùn)行。 2） 常值系統(tǒng)性定位誤差補(bǔ)償 類(lèi)庫(kù)以供設(shè)計(jì)者調(diào)用。這樣在零件的設(shè)計(jì)階段，設(shè)計(jì)者只需輸入特征的參數(shù)，系統(tǒng)直接生成特征的實(shí)例模型：在數(shù)據(jù)庫(kù)中我們必須存儲(chǔ)相關(guān)的特征類(lèi)的結(jié)構(gòu)信息，數(shù)據(jù)庫(kù)表集就是用于存儲(chǔ)這一部分的相關(guān)信息。根據(jù)特征類(lèi)型定義的需要，我們定義了特征類(lèi)編碼表、特征類(lèi)版本信息表表示特征類(lèi)型；定義了特征類(lèi)構(gòu)造表表達(dá)特征類(lèi)的結(jié)構(gòu)；并通過(guò)零件特征配置表與零件的特征層信息聯(lián)系起來(lái)。特征層數(shù)據(jù) 表集是本零件模型數(shù)據(jù)庫(kù)設(shè)計(jì)的核心，記錄了特征實(shí)例模型的設(shè)計(jì)、工藝等信息。特征構(gòu)造表記錄了特征的幾何結(jié)構(gòu)；特征尺寸表、特征形位公差表、特征表面粗糙度