数控机床英文论文 华译网翻译公司.doc

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英文原文
CNC machine tools
While the specific intention and application C machines vary from one machine type to another, all forms C mon benefits. Here are but a few of the more important benefits offered C equipment.
The first benefit offered by all forms C machine tools is improved automation. The operator intervention related to producing workpieces can be reduced or eliminated. C machines can run unattended during their entire machining cycle, freeing the operator to do other tasks. This gives C user several side benefits including reduced operator fatigue, fewer mistakes caused by human error, and consistent and predictable machining time for each workpiece. Since the machine will be running under program control, the skill level required of C operator (related to basic machining practice) is also reduced pared to a machinist producing workpieces with conventional machine tools.
The second major benefit C technology is consistent and accurate workpieces. Today'C machines boast almost unbelievable accuracy and repeatability specifications. This means that once a program is verified, two, ten, or one thousand identical workpieces can be easily produced with precision and consistency.
A third benefit offered by most forms C machine tools is flexibility. Since these machines are run from programs, running a different workpiece is almost as easy as loading a different program. Once a program has been verified and executed for one production run, it can be easily recalled the next time the workpiece is to be run. This leads to yet another benefit, fast change over. Since these machines are very easy to set up and run, and since programs can be easily loaded, they allow very short setup time. This is imperative with today's just-in-time (JIT) product requirements.
Motion control - the heart C
The most basic function of C machine is automatic, precise, and consistent motion control. Rath