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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

高速(su)加(jia)(jia)工(gong)(gong)(gong)中(zhong)(zhong)心是(shi)(shi)一(yi)种可以(yi)对(dui)加(jia)(jia)工(gong)(gong)(gong)工(gong)(gong)(gong)件(jian)进(jin)行高速(su)加(jia)(jia)工(gong)(gong)(gong)的(de)(de)(de)一(yi)种工(gong)(gong)(gong)具能(neng)够(gou)如此快速(su)的(de)(de)(de)进(jin)行工(gong)(gong)(gong)件(jian)的(de)(de)(de)加(jia)(jia)工(gong)(gong)(gong)除了因为高速(su)加(jia)(jia)工(gong)(gong)(gong)中(zhong)(zhong)心的(de)(de)(de)加(jia)(jia)工(gong)(gong)(gong)精密度和成熟的(de)(de)(de)技术之外(wai)更(geng)多的(de)(de)(de)还是(shi)(shi)得利与其优秀(xiu)的(de)(de)(de)数控系统(tong)(tong),在当前的(de)(de)(de)机床加(jia)(jia)工(gong)(gong)(gong)行业中(zhong)(zhong)为视线高速(su)稳(wen)定的(de)(de)(de)高精度加(jia)(jia)工(gong)(gong)(gong)运行快速(su)且功能(neng)强大的(de)(de)(de)计算机数控系统(tong)(tong)是(shi)(shi)必不可少,需要注意的(de)(de)(de)是(shi)(shi)高速(su)加(jia)(jia)工(gong)(gong)(gong)中(zhong)(zhong)心的(de)(de)(de)数控系统(tong)(tong)必须能(neng)够(gou)足够(gou)快地处(chu)理(li)数控程(cheng)序代码段以(yi)保(bao)持程(cheng)序中(zhong)(zhong)规定的(de)(de)(de)进(jin)给速(su)度。

 

高(gao)速(su)(su)加(jia)(jia)工(gong)中心在(zai)(zai)实际运行中是(shi)计(ji)算(suan)机(ji)数(shu)控(kong)系(xi)统(tong)(tong)(tong)用(yong)于测量(liang)一次工(gong)作台的(de)实际位置并发出一次进给命令所(suo)用(yong)的(de)时(shi)(shi)间(jian),对于伺服周(zhou)期和(he)代码段(duan)处(chu)理时(shi)(shi)间(jian)是(shi)计(ji)算(suan)机(ji)数(shu)控(kong)系(xi)统(tong)(tong)(tong)的(de)两个(ge)重要参数(shu)及其概念(nian)。计(ji)算(suan)机(ji)数(shu)控(kong)系(xi)统(tong)(tong)(tong)处(chu)理并完成一条加(jia)(jia)工(gong)指令代码段(duan)规定的(de)位移所(suo)花费的(de)时(shi)(shi)间(jian)。 计(ji)算(suan)机(ji)数(shu)控(kong)系(xi)统(tong)(tong)(tong)的(de)这两个(ge)参数(shu)对于高(gao)速(su)(su)加(jia)(jia)工(gong)中心来说非常重要,因(yin)为他们(men)将决定机(ji)床的(de)加(jia)(jia)工(gong)速(su)(su)度(du)和(he)加(jia)(jia)工(gong)精(jing)度(du)。在(zai)(zai)这里,精(jing)度(du)意味着在(zai)(zai)采用(yong)线性插补(bu)时(shi)(shi),用(yong)直线段(duan)来逼近零件轮(lun)廊(lang)所(suo)允(yun)许的(de)最大误差。

 

我(wo)们可(ke)以(yi)看到(dao)在高(gao)速(su)加(jia)工(gong)(gong)中(zhong)计(ji)(ji)算机数(shu)(shu)控(kong)系(xi)(xi)统(tong)(tong)必(bi)须保(bao)证形(xing)成精确的(de)(de)(de)加(jia)工(gong)(gong)轨(gui)迹,另外,在用直(zhi)线(xian)(xian)段(duan)(duan)来(lai)逼近零件(jian)轮廊时,为了(le)保(bao)证精度,直(zhi)线(xian)(xian)段(duan)(duan)势(shi)必(bi)很短,从而(er)使得零件(jian)程(cheng)序(xu)(xu)变得很长。基(ji)于此,计(ji)(ji)算机数(shu)(shu)控(kong)系(xi)(xi)统(tong)(tong)需要一(yi)个32位(wei)的(de)(de)(de)微处(chu)理(li)(li)器(qi),有(you)时甚至需要多(duo)个微处(chu)理(li)(li)器(qi),以(yi)完成高(gao)速(su)插(cha)补(bu)、高(gao)速(su)段(duan)(duan)处(chu)理(li)(li)和良(liang)好的(de)(de)(de)待(dai)加(jia)工(gong)(gong)轨(gui)迹监控(kong)(Look Ahead)功能(neng)。为了(le)能(neng)预先知道刀具(ju)路径(jing)以(yi)避(bi)免(mian)在拐角 处(chu)出现事故(gu),计(ji)(ji)算机数(shu)(shu)控(kong)系(xi)(xi)统(tong)(tong)最好是具(ju)有(you)较多(duo)段(duan)(duan)加(jia)工(gong)(gong) NC代(dai)码(ma)轨(gui)迹监控(kong)的(de)(de)(de)能(neng)力,这与司机必(bi)须有(you)良(liang)好的(de)(de)(de)视(shi)野 范围才能(neng)高(gao)速(su)驾驶一(yi)辆(liang)汽车有(you)些(xie)类似(si)。 目前所(suo)有(you)较高(gao)水平的(de)(de)(de)计(ji)(ji)算机数(shu)(shu)控(kong)系(xi)(xi)统(tong)(tong)都具(ju)有(you)待(dai)加(jia)工(gong)(gong)轨(gui)迹监控(kong)能(neng)力。所(suo)谓待(dai)加(jia)工(gong)(gong)轨(gui)迹监控(kong),就是计(ji)(ji)算机数(shu)(shu)控(kong)系(xi)(xi)统(tong)(tong)在控(kong)制(zhi)加(jia)工(gong)(gong)的(de)(de)(de)同(tong)时扫(sao)描(miao)待(dai)加(jia)工(gong)(gong)的(de)(de)(de)数(shu)(shu)控(kong)代(dai)码(ma),看刀具(ju)路径(jing)是否(fou)有(you)方向上的(de)(de)(de)突然改变,如果计(ji)(ji)算机数(shu)(shu)控(kong)系(xi)(xi)统(tong)(tong)发现前面必(bi)须改变进给方向时,自动执行加(jia)减速(su)程(cheng)序(xu)(xu),以(yi)避(bi)免(mian)高(gao)速(su)加(jia)工(gong)(gong)中(zhong)心偏离程(cheng)序(xu)(xu)中(zhong)规定(ding)的(de)(de)(de)切削(xue)加(jia)工(gong)(gong)路径(jing)。


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