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高速加工中心的数控系统概述

日期:2017-08-10 作者: 人气:1899

高(gao)速(su)加(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)中(zhong)(zhong)心(xin)是一种(zhong)可以对加(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)件进行(xing)高(gao)速(su)加(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)的(de)(de)一种(zhong)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)具(ju)能(neng)够(gou)如此快速(su)的(de)(de)进行(xing)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)件的(de)(de)加(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)除了因为高(gao)速(su)加(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)中(zhong)(zhong)心(xin)的(de)(de)加(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)精密度(du)和成熟的(de)(de)技术之外更多的(de)(de)还是得(de)利(li)与其(qi)优秀的(de)(de)数(shu)(shu)控(kong)系(xi)统,在当前的(de)(de)机床(chuang)加(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)行(xing)业中(zhong)(zhong)为视线高(gao)速(su)稳定的(de)(de)高(gao)精度(du)加(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)运(yun)行(xing)快速(su)且功(gong)能(neng)强大的(de)(de)计(ji)算机数(shu)(shu)控(kong)系(xi)统是必不(bu)可少,需要注意(yi)的(de)(de)是高(gao)速(su)加(jia)(jia)工(gong)(gong)(gong)(gong)(gong)(gong)(gong)(gong)中(zhong)(zhong)心(xin)的(de)(de)数(shu)(shu)控(kong)系(xi)统必须(xu)能(neng)够(gou)足够(gou)快地(di)处理数(shu)(shu)控(kong)程(cheng)序代码段以保持程(cheng)序中(zhong)(zhong)规定的(de)(de)进给速(su)度(du)。

 

高速(su)(su)加(jia)(jia)工(gong)(gong)中(zhong)(zhong)心在(zai)(zai)实际(ji)运(yun)行(xing)中(zhong)(zhong)是计算(suan)机(ji)数控系统(tong)(tong)用(yong)于(yu)(yu)(yu)测量一(yi)次工(gong)(gong)作台的(de)(de)(de)(de)实际(ji)位置(zhi)并(bing)发出一(yi)次进给(ji)命令所(suo)用(yong)的(de)(de)(de)(de)时间(jian),对于(yu)(yu)(yu)伺服周期和(he)代码段(duan)(duan)处理时间(jian)是计算(suan)机(ji)数控系统(tong)(tong)的(de)(de)(de)(de)两(liang)(liang)个(ge)重要(yao)(yao)参(can)(can)数及其概(gai)念。计算(suan)机(ji)数控系统(tong)(tong)处理并(bing)完成一(yi)条加(jia)(jia)工(gong)(gong)指令代码段(duan)(duan)规定的(de)(de)(de)(de)位移所(suo)花费的(de)(de)(de)(de)时间(jian)。 计算(suan)机(ji)数控系统(tong)(tong)的(de)(de)(de)(de)这两(liang)(liang)个(ge)参(can)(can)数对于(yu)(yu)(yu)高速(su)(su)加(jia)(jia)工(gong)(gong)中(zhong)(zhong)心来说非常(chang)重要(yao)(yao),因为他们将(jiang)决定机(ji)床的(de)(de)(de)(de)加(jia)(jia)工(gong)(gong)速(su)(su)度和(he)加(jia)(jia)工(gong)(gong)精(jing)度。在(zai)(zai)这里,精(jing)度意味(wei)着在(zai)(zai)采用(yong)线(xian)性插(cha)补时,用(yong)直线(xian)段(duan)(duan)来逼近零件轮廊所(suo)允(yun)许的(de)(de)(de)(de)最大误差。

 

我们(men)可以(yi)看(kan)到在高(gao)速加(jia)(jia)(jia)工(gong)(gong)中(zhong)计(ji)(ji)算(suan)机(ji)数(shu)控系(xi)(xi)(xi)统必须(xu)保证(zheng)形(xing)成(cheng)(cheng)精(jing)确的加(jia)(jia)(jia)工(gong)(gong)轨迹(ji),另外,在用直线(xian)段来逼近(jin)零件(jian)轮廊时,为(wei)了保证(zheng)精(jing)度,直线(xian)段势必很(hen)短,从而使(shi)得(de)零件(jian)程序变得(de)很(hen)长。基于此(ci),计(ji)(ji)算(suan)机(ji)数(shu)控系(xi)(xi)(xi)统需要一个32位的微(wei)处理(li)器(qi),有(you)时甚至(zhi)需要多(duo)个微(wei)处理(li)器(qi),以(yi)完成(cheng)(cheng)高(gao)速插(cha)补、高(gao)速段处理(li)和良好(hao)的待(dai)(dai)加(jia)(jia)(jia)工(gong)(gong)轨迹(ji)监控(Look Ahead)功(gong)能(neng)(neng)。为(wei)了能(neng)(neng)预先知道刀具(ju)路径(jing)以(yi)避(bi)免(mian)在拐(guai)角 处出现事故,计(ji)(ji)算(suan)机(ji)数(shu)控系(xi)(xi)(xi)统最好(hao)是具(ju)有(you)较多(duo)段加(jia)(jia)(jia)工(gong)(gong) NC代(dai)码轨迹(ji)监控的能(neng)(neng)力(li),这与司(si)机(ji)必须(xu)有(you)良好(hao)的视野 范围才能(neng)(neng)高(gao)速驾驶(shi)一辆汽车有(you)些类似。 目前所(suo)有(you)较高(gao)水平的计(ji)(ji)算(suan)机(ji)数(shu)控系(xi)(xi)(xi)统都具(ju)有(you)待(dai)(dai)加(jia)(jia)(jia)工(gong)(gong)轨迹(ji)监控能(neng)(neng)力(li)。所(suo)谓待(dai)(dai)加(jia)(jia)(jia)工(gong)(gong)轨迹(ji)监控,就是计(ji)(ji)算(suan)机(ji)数(shu)控系(xi)(xi)(xi)统在控制(zhi)加(jia)(jia)(jia)工(gong)(gong)的同时扫描(miao)待(dai)(dai)加(jia)(jia)(jia)工(gong)(gong)的数(shu)控代(dai)码,看(kan)刀具(ju)路径(jing)是否有(you)方向上的突然(ran)改(gai)变,如果计(ji)(ji)算(suan)机(ji)数(shu)控系(xi)(xi)(xi)统发现前面必须(xu)改(gai)变进给(ji)方向时,自动执(zhi)行加(jia)(jia)(jia)减速程序,以(yi)避(bi)免(mian)高(gao)速加(jia)(jia)(jia)工(gong)(gong)中(zhong)心偏离程序中(zhong)规定(ding)的切(qie)削加(jia)(jia)(jia)工(gong)(gong)路径(jing)。


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