模具专业英语 第三版 Unit Four.pptVIP

Unit Four Manufacturing Technology of Mold Lesson 15 Numerical Control Lesson 16 Electric Discharge Machining Lesson 17 Wire Electrical Discharge Machining（Wire EDM） Lesson 15 Numerical Control Numerical control（NC） refers to the automation of machine tools that are operated by abstractly programmed commands encoded on a storage medium. The first NC machines were built in the 1940s and 1950s，based on existing tools that were modified with motors that moved the controls to follow points fed into the system on punched tape. 数控（NC）是指由存储器上的抽象编程命令控制的自动化机器加工。第一台数控机床制造于二十世纪四五十年代，是在已有工具的基础上通过改动马达，使操控装置沿着穿孔纸带上的点进行运动。 In modern CNC systems， end -to -end component design is highly automated using computer -aided design（CAD） and computer -aided manufacturing（CAM） programs. The programs produce a computer file that is interpreted to extract the commands needed to operate a particular machine via a postprocessor， and then loaded into the CNC machines for production. 在现代数控系统中，终端到终端的组件设计是计算机辅助设计（CAD）和计算机辅助制 造（CAM）程序高度自动化的运用。程序会形成一个计算机文件，该文件会提取通过后置处 理器操控特定机器的命令，然后加载到数控机床进行生产。 The introduction of the microprocessor in the 1970s further reduced the cost of implementation， and today almost all CNC machines use some form of microprocessor to handle all operations. The introduction of lower -cost CNC machines radically changed the manufacturing industry. 20世纪70年代微处理器推出，进一步降低了 处理成本，现在，几乎所有的数控机床都用某种形式的微处理器来处理所有的操作。 低成本数控机床的引入从根本上改变了制造业。 With the increased automation of manufacturing processes with CNC machining， considerable improvements in consistency and quality have been achieved with no strain on the operator. CNC automation reduced the frequency of errors and provided CNC operators with time to perform additional tasks. 随着数控加工自动化程度的提高， 加工一致性和质量有了很大的改善，操作者无需压力。数控加工自动化降低了错误频率，为 数控操作者提供了从事额外任务的时间。 Modern CNC mills diffe