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AO202/SI
AO202/SI
AO202/SI
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福建光沃自動化設(shè)備有限公司
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測量方法是從7個任意位置分別進行一次原點復(fù)歸，測定其停止位置，以讀出的最大差值作為原點復(fù)歸精度。
應(yīng)當指出，現(xiàn)有定位精度的檢測是在快速、定位的情況下測量的，對某些進給系統(tǒng)風(fēng)度不太好的數(shù)控機床，采用不同進給速度定位時，會得到不同的定位精度值。另外，定位精度的測定結(jié)果與環(huán)境溫度和該坐標軸的工作狀態(tài)有關(guān)，目前大部分數(shù)控機床采用半閉環(huán)系統(tǒng)，位置檢測元件大多安裝在驅(qū)動電動機上，在1m行程內(nèi)產(chǎn)生0.01~0.02mm的誤差是不奇怪的。這是熱伸長產(chǎn)生的誤差，有些機床便采用預(yù)拉伸(預(yù)緊)的方法來減少影響。
每個坐標軸的重復(fù)定位精度是反映該軸的最基本精度指標，它反映了該軸運動精度的穩(wěn)定性，不能設(shè)想精度差的機床能穩(wěn)定地用于生產(chǎn)。目前，由于數(shù)控系統(tǒng)功能越來越多，對每個坐噴射器標運動精度的系統(tǒng)誤差如螺距積累誤差、反向間隙誤差等都可以進行系統(tǒng)補償，只有隨機誤差沒法補償，而重復(fù)定位精度正是反映了進給驅(qū)動機構(gòu)的綜合隨機誤差，它無法用數(shù)控系統(tǒng)補償來修正，當發(fā)現(xiàn)它超差時，只有對進給傳動鏈進行精調(diào)修正。因此，如果允許對機床進行選擇，則應(yīng)選擇重復(fù)定位精度高的機床為好。
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