數(shù)控專業(yè)外文文獻翻譯-外文翻譯--數(shù)控機床開環(huán)控制伺服系統(tǒng)與數(shù)控生產(chǎn)設備
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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 o'to 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 ① 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 ② 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 ① of of in ② of ③ of ④ 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)控機床開環(huán)控制伺服系統(tǒng)與數(shù)控生產(chǎn)設備 摘要 開環(huán)系統(tǒng)的優(yōu)點是系統(tǒng)簡單、成本低,但缺點是精度低。反向間隙、絲杠螺距誤差、起停誤差等都會影響定位精度。下面幾種改進措施可以使定位精度明顯改善。 關鍵字:數(shù)控系統(tǒng)、開環(huán)系統(tǒng) 1) 反向間隙誤 差補償 數(shù)控機床加工刀具與工件的相對運動是依靠驅動裝置帶動齒輪、絲杠轉動,從而推動工作臺面等移動部件產(chǎn)生位移來實現(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,當運動的方向改變時,開始段時間必然會引起驅動元件的空走,出現(xiàn)指令脈沖推不動執(zhí)行元件的局面。這就影響了機床的加工精度,即指令脈沖與實際進給步數(shù)不相符合,產(chǎn)生加工誤差 因此,開環(huán)數(shù)控系統(tǒng)一般都設置有反向間隙誤差補償功能,用以補足空走的步數(shù)反向間隙差補償就是首先實測反向進給的誤差,把它折算成脈沖當量數(shù),作為間隙補償子程 序的輸出量,當計算機判斷出現(xiàn)的指令為反向運動時,隨即調用間隙補償子程序,通過輸出補償脈沖消除反向間隙后再進行正常的插補運行。 2) 常值系統(tǒng)性定位誤差補償 類庫以供設計者調用。這樣在零件的設計階段,設計者只需輸入特征的參數(shù),系統(tǒng)直接生成特征的實例模型:在數(shù)據(jù)庫中我們必須存儲相關的特征類的結構信息,數(shù)據(jù)庫表集就是用于存儲這一部分的相關信息。根據(jù)特征類型定義的需要,我們定義了特征類編碼表、特征類版本信息表表示特征類型;定義了特征類構造表表達特征類的結構;并通過零件特征配置表與零件的特征層信息聯(lián)系起來。特征層數(shù)據(jù) 表集是本零件模型數(shù)據(jù)庫設計的核心,記錄了特征實例模型的設計、工藝等信息。特征構造表記錄了特征的幾何結構;特征尺寸表、特征形位公差表、特征表面粗糙度- 配套講稿:
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