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高速加工中心的数控系统概述

日期:2017-08-10 作(zuo)者: 人气:1899

高(gao)速(su)(su)加(jia)(jia)工(gong)(gong)(gong)中(zhong)(zhong)心(xin)是(shi)一(yi)种可以对(dui)加(jia)(jia)工(gong)(gong)(gong)工(gong)(gong)(gong)件进(jin)行高(gao)速(su)(su)加(jia)(jia)工(gong)(gong)(gong)的(de)(de)一(yi)种工(gong)(gong)(gong)具能(neng)够(gou)(gou)如此快(kuai)(kuai)速(su)(su)的(de)(de)进(jin)行工(gong)(gong)(gong)件的(de)(de)加(jia)(jia)工(gong)(gong)(gong)除了因为高(gao)速(su)(su)加(jia)(jia)工(gong)(gong)(gong)中(zhong)(zhong)心(xin)的(de)(de)加(jia)(jia)工(gong)(gong)(gong)精密度和(he)成熟的(de)(de)技术之外更多的(de)(de)还(hai)是(shi)得利(li)与其优秀的(de)(de)数控系(xi)统(tong),在(zai)当前的(de)(de)机床加(jia)(jia)工(gong)(gong)(gong)行业中(zhong)(zhong)为视线高(gao)速(su)(su)稳定(ding)的(de)(de)高(gao)精度加(jia)(jia)工(gong)(gong)(gong)运行快(kuai)(kuai)速(su)(su)且功能(neng)强大的(de)(de)计算机数控系(xi)统(tong)是(shi)必不可少,需(xu)要注意的(de)(de)是(shi)高(gao)速(su)(su)加(jia)(jia)工(gong)(gong)(gong)中(zhong)(zhong)心(xin)的(de)(de)数控系(xi)统(tong)必须(xu)能(neng)够(gou)(gou)足够(gou)(gou)快(kuai)(kuai)地(di)处(chu)理数控程序代码段以保(bao)持程序中(zhong)(zhong)规(gui)定(ding)的(de)(de)进(jin)给速(su)(su)度。

 

高速(su)(su)加(jia)(jia)工(gong)(gong)中心在(zai)实(shi)际运行中是计(ji)算(suan)(suan)机(ji)数控(kong)系统(tong)(tong)用(yong)于测量(liang)一次工(gong)(gong)作(zuo)台的(de)实(shi)际位(wei)置(zhi)并(bing)发出一次进(jin)给命令所用(yong)的(de)时(shi)(shi)间(jian)(jian),对(dui)于伺服(fu)周期和代(dai)码段(duan)处理(li)时(shi)(shi)间(jian)(jian)是计(ji)算(suan)(suan)机(ji)数控(kong)系统(tong)(tong)的(de)两(liang)个重要参(can)数及其概念。计(ji)算(suan)(suan)机(ji)数控(kong)系统(tong)(tong)处理(li)并(bing)完成一条(tiao)加(jia)(jia)工(gong)(gong)指令代(dai)码段(duan)规定(ding)的(de)位(wei)移所花(hua)费的(de)时(shi)(shi)间(jian)(jian)。 计(ji)算(suan)(suan)机(ji)数控(kong)系统(tong)(tong)的(de)这(zhei)两(liang)个参(can)数对(dui)于高速(su)(su)加(jia)(jia)工(gong)(gong)中心来说非常重要,因为他(ta)们将决定(ding)机(ji)床的(de)加(jia)(jia)工(gong)(gong)速(su)(su)度和加(jia)(jia)工(gong)(gong)精(jing)度。在(zai)这(zhei)里(li),精(jing)度意(yi)味着在(zai)采用(yong)线性插补时(shi)(shi),用(yong)直线段(duan)来逼(bi)近零件轮廊所允许的(de)最大(da)误差。

 

我们可以看到在(zai)(zai)高(gao)速加(jia)工(gong)(gong)中计(ji)算(suan)(suan)机数(shu)(shu)(shu)控(kong)(kong)系(xi)(xi)统必(bi)须保证形(xing)成(cheng)精(jing)确的加(jia)工(gong)(gong)轨(gui)迹(ji),另(ling)外,在(zai)(zai)用(yong)直(zhi)线段(duan)来逼近零件轮廊时(shi)(shi),为(wei)了保证精(jing)度,直(zhi)线段(duan)势(shi)必(bi)很短(duan),从而使得零件程(cheng)序(xu)变得很长。基于此(ci),计(ji)算(suan)(suan)机数(shu)(shu)(shu)控(kong)(kong)系(xi)(xi)统需(xu)要一(yi)个(ge)32位的微(wei)处理器,有(you)(you)(you)(you)(you)时(shi)(shi)甚至(zhi)需(xu)要多(duo)个(ge)微(wei)处理器,以完成(cheng)高(gao)速插补、高(gao)速段(duan)处理和良好(hao)的待加(jia)工(gong)(gong)轨(gui)迹(ji)监(jian)控(kong)(kong)(Look Ahead)功能(neng)(neng)。为(wei)了能(neng)(neng)预先知道(dao)刀(dao)具(ju)路径(jing)以避免(mian)在(zai)(zai)拐(guai)角 处出现事故,计(ji)算(suan)(suan)机数(shu)(shu)(shu)控(kong)(kong)系(xi)(xi)统最(zui)好(hao)是具(ju)有(you)(you)(you)(you)(you)较多(duo)段(duan)加(jia)工(gong)(gong) NC代码(ma)轨(gui)迹(ji)监(jian)控(kong)(kong)的能(neng)(neng)力,这与(yu)司机必(bi)须有(you)(you)(you)(you)(you)良好(hao)的视野(ye) 范围才能(neng)(neng)高(gao)速驾(jia)驶一(yi)辆汽车有(you)(you)(you)(you)(you)些(xie)类似。 目前所有(you)(you)(you)(you)(you)较高(gao)水平的计(ji)算(suan)(suan)机数(shu)(shu)(shu)控(kong)(kong)系(xi)(xi)统都具(ju)有(you)(you)(you)(you)(you)待加(jia)工(gong)(gong)轨(gui)迹(ji)监(jian)控(kong)(kong)能(neng)(neng)力。所谓待加(jia)工(gong)(gong)轨(gui)迹(ji)监(jian)控(kong)(kong),就是计(ji)算(suan)(suan)机数(shu)(shu)(shu)控(kong)(kong)系(xi)(xi)统在(zai)(zai)控(kong)(kong)制加(jia)工(gong)(gong)的同(tong)时(shi)(shi)扫描(miao)待加(jia)工(gong)(gong)的数(shu)(shu)(shu)控(kong)(kong)代码(ma),看刀(dao)具(ju)路径(jing)是否(fou)有(you)(you)(you)(you)(you)方向上的突(tu)然改(gai)变,如果计(ji)算(suan)(suan)机数(shu)(shu)(shu)控(kong)(kong)系(xi)(xi)统发现前面必(bi)须改(gai)变进给方向时(shi)(shi),自动执行加(jia)减速程(cheng)序(xu),以避免(mian)高(gao)速加(jia)工(gong)(gong)中心偏离(li)程(cheng)序(xu)中规定的切削(xue)加(jia)工(gong)(gong)路径(jing)。


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