数控机床是一种以数字方式控制刀具和工件之间相对运动位置的自动化机床。它们主要用于加工形状复杂的机械零件,是机械工业中的一种不可缺少的加工手段。计算机数控(CNC)系统出现以前,数控机床的控制系统都是用专门的硬件电路构成的,因此使用的无、器件较多,结构复杂。在现有的数控机床中,有不少是因为控制系统的可靠性差而不能正常地投入生产,因此,对这些机床进行必要的改造,使它们发挥应有的作用也是机械工业中的一个重要任务。而用微计算机实现对这些机床的控制则是提高控制系统的可靠 A CNC machine is a type of automated machine that digitally controls the relative motion between a tool and a workpiece. They are mainly used for machining complex mechanical parts, is an indispensable tool in the machinery industry. Computer numerical control (CNC) system Before the advent of CNC machine control systems are used to form a special hardware circuit, so the use of more devices, more complex structure. Many of the existing CNC machine tools can not be put into production properly due to the poor reliability of the control system. Therefore, it is also an important task for the machinery industry to make the necessary modifications to these machines so that they can perform their proper functions . The use of micro-computer control of these machines is to improve the control system reliability