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In addition to the machining process, NC machine tools have also been developed for other metalworking processes. These machines include:
除了上述几种机械加工方法，数控机床可用于其他金属加工过程包括
Punch presses for sheet metal hole punching
用于薄片板的金属板上冲孔的冲压机
Presses for sheet metal bending
用于薄片金属弯曲的折弯机。
The introduction of numerical control has had a pronounced influence on the design and operation of machine tools.
数控技术的介入到机加工对机床的设计和运用有着显著的影响。
One of the effects of NC has been that the proportion of time spent by the machine cutting metal under program control is significantly greater than with manually operated machines.
数控影响之一在程序控制下切削金属的时间与传统手动机床大得多。
This causes certain components, such as the spindle, drive gears, and feed screws, to wear more rapidly. These components must be designed to last longer on NC machines。
所以对于一些零件如主轴驱动主轴丝杠磨损更快，这些零件要设计成持续时间长的。
Second, the addition of the electronic control unit has increased the cost of the machine, therefore requiring higher equipment utilization.
第二，增加电子控制单元后设备成本也随之增加，因此需要更高的利用率。
Instead of running the machine on only one shift, which was the convention with manually operated machines, NC machines are often operated two or even three shifts to obtain the required payback.
取代传统手工操作的一班制数控机床通常采用两班或三班制来获得更多的回报。
Also, the NC machines are designed to reduce the time consumed by the non-processing elements in the operation cycle, such as loading and unloading the workpart, and changing tools.
数控机床的设计中减少了非操作过程的时间如装卸工件和换刀时间。
Third, the increasing cost of labor has altered the relative roles of the operator and the machine tool. Consider the role of the human operator.
第三，增加的劳动成本由人工成本变为设备成本。
