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英文原文 NC to NC a of NC by NC is to be or NC to do NC by be NC to is as to a NC is s a is or be A by NC is a is as as a a it be is to be to to up is s of NC is to as is in a NC or of be of a a of by as is on to be to of NC A to a of of in A on to of a be on a As a in on By a on a is of of is It be NC to by to to in to a (be to of on a to NC to be in a by of NC By of is of in a to a is be if to be to a to of is If to is to to in a to is NC to 90. In be is of is of In 91), s of be be is of on Be to If in as To be is to it to of in to do In if a is in of be On if a is of be in NC be of or is NC to is to in it is to is a 50) at at at of to is of to to to A be as a MC 1. MC is of to 2. is in of it in A or MC he to at of in a 0 to a of of of 0 to 2of in to 63 of of of of or a of of it be It is in to or a of to of a is of or If is if it be a of it a on of to in is on is to . of to to of to of to or is of if a of in is is on or a D on in be A is in be or of in s is to on of on .5 . of of of is SM is an of on as by or to be to be of AM be s . on 931, a at a 5in at to . . to a to in at . to is a of at at is SM be on s is to 0 or 300 3 000 10 km/in of to to of is of to a C is a of a as in of of be in to in SC a of on On SC on Be to FF on Do SC 5 SC a of on of Do SC OT to s a of on of of in at of on of on if it 5 at on is in to a to NC a to s by of a at as If a is of an t to t if t t it as We of If t is to is to is by to , is by is by is t if is t to of in t is a if it or in a s to a if or to of on It is to a do on 中文译文 数控机床 虽然各种数控机床的功能和应用各不相同，但它们有着共同的优点。这里是数控设备提供的比较重要的几个优点。 各种数控机床的第一个优点是自动化程度提高了。零件制造过程中的人为干预减少或者免除了。整个加工循环中，很多数控机床处于无人照看状态，这使操作员被解放出来，可以干别的工作。数控机床用户得到的几个额外好处是：数控机床减小了操作员的疲劳程度，减少了人为误差，工件加工时间一致而且可预测。由于机床在程序的控制下运行，与操作普通机床的机械师要求的技能水平相比，对数控操作员的技能水平要求（与基本加工实践相关）也降低了。 数控技术的第二个优点是工件的一致性好，加工精度高。现在的数控机床宣称的精度以及重复定位精度 几乎令人难以置信。这意味着，一旦程序被验证是正确的，可以很容易地加工出 2个、 10个或 1000个相同的零件，而且它们的精度高，一致性好 。 大多数数控机床的第三个优点是柔性强。由于这些机床在程序的控制下工作，加工不同的工件易如在数控系统中装载一个不同的程序而己。一旦程序验证正确，并且运行一次，下次加工工件的时候，可以很方便地重新调用程序。这又带来另一个好处 可以快速切换不同工件的加工。由于这些机床很容易调整并运行，也由于很容易装载加工程序，因此机床的调试时间很短。这是当今准时生产制造模式所要求的。 任何 数控机床最基本的功能是具有自动、精确、一致的运动控制。大多数普通机床完全运用机械装置实现其所需的运动，而数控机床是以一种全新的方式控制机床的运动。各种数控设备有两个或多个运动方向，称为轴。这些轴沿着其长度方向精确、自动定位。最常用的两类轴是直线轴（沿直线轨迹）和旋转轴（沿圆形轨迹）。普通机床需通过旋转摇柄和手轮产生运动，而数控机床通过编程指令产生运动。通常，几乎所有的数控机床的运动类型（快速定位、直线插补和圆弧插补）、移动轴、移动距离以及移动速度（进给速度）都是可编程的。 数控系统中的 令命 令驱动电机旋转某一精确的转数，驱动电机的旋转随即使滚珠丝杠旋转，滚珠
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