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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)工(gong)(gong)(gong)中(zhong)心是一种(zhong)可(ke)以对(dui)加(jia)工(gong)(gong)(gong)工(gong)(gong)(gong)件进(jin)行(xing)高(gao)速(su)(su)加(jia)工(gong)(gong)(gong)的(de)(de)一种(zhong)工(gong)(gong)(gong)具能(neng)够(gou)如此(ci)快速(su)(su)的(de)(de)进(jin)行(xing)工(gong)(gong)(gong)件的(de)(de)加(jia)工(gong)(gong)(gong)除了因为高(gao)速(su)(su)加(jia)工(gong)(gong)(gong)中(zhong)心的(de)(de)加(jia)工(gong)(gong)(gong)精(jing)密度和成(cheng)熟的(de)(de)技术之(zhi)外更多的(de)(de)还(hai)是得利与(yu)其优秀的(de)(de)数(shu)控(kong)系统,在当前的(de)(de)机床加(jia)工(gong)(gong)(gong)行(xing)业中(zhong)为视(shi)线高(gao)速(su)(su)稳定(ding)的(de)(de)高(gao)精(jing)度加(jia)工(gong)(gong)(gong)运行(xing)快速(su)(su)且(qie)功能(neng)强大的(de)(de)计算机数(shu)控(kong)系统是必不可(ke)少(shao),需要(yao)注意的(de)(de)是高(gao)速(su)(su)加(jia)工(gong)(gong)(gong)中(zhong)心的(de)(de)数(shu)控(kong)系统必须能(neng)够(gou)足够(gou)快地(di)处理数(shu)控(kong)程序(xu)代码(ma)段以保持程序(xu)中(zhong)规(gui)定(ding)的(de)(de)进(jin)给(ji)速(su)(su)度。

 

高(gao)速加工中心在实际(ji)运行中是计算机(ji)数(shu)(shu)(shu)控系(xi)统(tong)用(yong)于测量一(yi)次(ci)工作(zuo)台的(de)(de)实际(ji)位置(zhi)并发出一(yi)次(ci)进给命令所用(yong)的(de)(de)时间(jian),对于伺服周期和代码段处(chu)理(li)时间(jian)是计算机(ji)数(shu)(shu)(shu)控系(xi)统(tong)的(de)(de)两个重(zhong)要(yao)参数(shu)(shu)(shu)及其概念。计算机(ji)数(shu)(shu)(shu)控系(xi)统(tong)处(chu)理(li)并完成一(yi)条加工指令代码段规(gui)定的(de)(de)位移所花费的(de)(de)时间(jian)。 计算机(ji)数(shu)(shu)(shu)控系(xi)统(tong)的(de)(de)这(zhei)两个参数(shu)(shu)(shu)对于高(gao)速加工中心来(lai)说非常重(zhong)要(yao),因为他(ta)们将(jiang)决定机(ji)床的(de)(de)加工速度和加工精度。在这(zhei)里,精度意味着(zhe)在采用(yong)线性插补时,用(yong)直线段来(lai)逼(bi)近零件轮(lun)廊所允许的(de)(de)最(zui)大误差。

 

我们可(ke)以看(kan)到在高(gao)速(su)(su)加(jia)工(gong)(gong)中计(ji)(ji)(ji)算(suan)机(ji)(ji)(ji)数(shu)(shu)(shu)控(kong)(kong)(kong)(kong)系(xi)统(tong)必须保(bao)证(zheng)(zheng)形成精确的(de)加(jia)工(gong)(gong)轨迹(ji)(ji)(ji),另外(wai),在用直(zhi)线(xian)段(duan)来逼近零件轮廊时,为了(le)保(bao)证(zheng)(zheng)精度,直(zhi)线(xian)段(duan)势必很短,从(cong)而使得零件程(cheng)(cheng)序(xu)变得很长。基(ji)于此,计(ji)(ji)(ji)算(suan)机(ji)(ji)(ji)数(shu)(shu)(shu)控(kong)(kong)(kong)(kong)系(xi)统(tong)需要(yao)一个(ge)(ge)32位(wei)的(de)微处(chu)理器,有(you)时甚至需要(yao)多个(ge)(ge)微处(chu)理器,以完成高(gao)速(su)(su)插补、高(gao)速(su)(su)段(duan)处(chu)理和良好(hao)的(de)待(dai)(dai)(dai)加(jia)工(gong)(gong)轨迹(ji)(ji)(ji)监(jian)控(kong)(kong)(kong)(kong)(Look Ahead)功能(neng)(neng)。为了(le)能(neng)(neng)预先知道刀(dao)具路(lu)径(jing)以避免在拐角 处(chu)出现事故,计(ji)(ji)(ji)算(suan)机(ji)(ji)(ji)数(shu)(shu)(shu)控(kong)(kong)(kong)(kong)系(xi)统(tong)最好(hao)是具有(you)较多段(duan)加(jia)工(gong)(gong) NC代码轨迹(ji)(ji)(ji)监(jian)控(kong)(kong)(kong)(kong)的(de)能(neng)(neng)力,这与司机(ji)(ji)(ji)必须有(you)良好(hao)的(de)视野 范(fan)围(wei)才能(neng)(neng)高(gao)速(su)(su)驾驶一辆(liang)汽车(che)有(you)些类似(si)。 目前(qian)所有(you)较高(gao)水平的(de)计(ji)(ji)(ji)算(suan)机(ji)(ji)(ji)数(shu)(shu)(shu)控(kong)(kong)(kong)(kong)系(xi)统(tong)都具有(you)待(dai)(dai)(dai)加(jia)工(gong)(gong)轨迹(ji)(ji)(ji)监(jian)控(kong)(kong)(kong)(kong)能(neng)(neng)力。所谓待(dai)(dai)(dai)加(jia)工(gong)(gong)轨迹(ji)(ji)(ji)监(jian)控(kong)(kong)(kong)(kong),就是计(ji)(ji)(ji)算(suan)机(ji)(ji)(ji)数(shu)(shu)(shu)控(kong)(kong)(kong)(kong)系(xi)统(tong)在控(kong)(kong)(kong)(kong)制加(jia)工(gong)(gong)的(de)同时扫描待(dai)(dai)(dai)加(jia)工(gong)(gong)的(de)数(shu)(shu)(shu)控(kong)(kong)(kong)(kong)代码,看(kan)刀(dao)具路(lu)径(jing)是否有(you)方向上的(de)突(tu)然改(gai)变,如果计(ji)(ji)(ji)算(suan)机(ji)(ji)(ji)数(shu)(shu)(shu)控(kong)(kong)(kong)(kong)系(xi)统(tong)发现前(qian)面(mian)必须改(gai)变进给方向时,自动执行(xing)加(jia)减(jian)速(su)(su)程(cheng)(cheng)序(xu),以避免高(gao)速(su)(su)加(jia)工(gong)(gong)中心偏离程(cheng)(cheng)序(xu)中规定的(de)切削加(jia)工(gong)(gong)路(lu)径(jing)。


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