机械工程专业英语教程（第２版）Lesson 66

1、Lesson 66 Numerical ControlTerminologyText tour 8/5/20221机械工程专业英语教程Terminology8/5/20222机械工程专业英语教程Prerecord To record (a program, for example) at an earlier time for later use将预先录入，预先录制：为后期的使用而预先录制（如程序）Punch 1A tool for circular or other piercing打孔器：用来进行球形或其他形式穿透的工具：2To use a punch or use a punch on使

2、用打孔器或用打孔器在上打孔机械工程专业英语教程8/5/2022Rerun 重新再运行A repeat of a machine run from its beginning, usually made desirable or necessary by a false start, by an interruption, or by a change.从起点重复一次机器运行，通常是因为不正确启动、中断或变更的需要而进行的。 3One of the most fundamental concepts in the area of advanced manufacturing technologi

3、es is numerical control (NC). Prior to the advent of NC, all machine tools were manually operated and controlled. Among the many limitations associated with manual control machine tools, perhaps none is more prominent than the limitation of operator skills.先进制造技术中的一个最基本的概念是数字控制(NC)。在数控技术出现之前，所有的机床都是

4、由人工操纵和控制的。在与人工控制的机床有关的很多局限性中，操作者的技能大概是最突出的问题。机械工程专业英语教程8/5/2022Text tour4Numerical control was developed to overcome the limitation of human operators, and it has done so. Numerical control machines are more accurate than manually operated machines, they can produce parts more uniformly, they are fa

5、ster, and thelong-run tooling costs are lower.发展数控技术是为了克服人类操作者的局限性，而且它确实完成了这项工作。数字控制的机器比人工操纵的机器的精度更高、生产出零件的一致性更好、生产速度更快、而且长期的工艺装备成本更低。机械工程专业英语教程8/5/20225A major problem was the fragility of the punched paper tape medium. It was common for the paper tape containing the programmed instructions to brea

6、k or tear during a machining process. This problem was exacerbated by the fact that each successive time a part was produced on a machine tool, the paper tape carrying the programmed instructions had to be rerun through the reader.一个主要问题是穿孔纸带的易损坏性。在机械加工过程中，载有编程指令信息的纸带断裂和被撕坏是常见的事情。在机床上每加工一个零件，都需要将载有编

7、程指令的纸带放入阅读机中重新运行一次。因此，这个问题变得很严重。机械工程专业英语教程8/5/20226The development of a concept known as direct numerical control (DNC) solved the paper and plastic tape problems associated with numerical control by simply eliminating tape as the medium for carrying the programmed instructions. In direct numerical

8、control, machine tools are tied, via a data transmission link, to a host computer.在形成了直接数字控制(DNC)这个概念之后，可以不再采用纸带或塑料带作为编程指令的载体，这样就解决了与之有关的问题。在直接数字控制中，几台机床通过数据传输线路联接到一台主计算机上。操纵这些机床所需要的程序都存储在这台主计算机中。机械工程专业英语教程8/5/20227The development of the microprocessor allowed for the development of programmable logic controllers (PLCs) and microcomputers. These two technologies allowed for the development of computer numerical control (CNC). With CNC, each machine tool has a PLC or a microcomputer that s