Unit 14 Beyond CNC Machining,第14单元 数控加工技术的扩展,Reading Target,After reading this unit, you should be able to have a sense of the other computer operations around the CNC process.,Text,Modern manufacturing is interwoven with and controlled by computer technology. Although CNC is a historical core of computer-integrated manufacturing (CIM), the power of the microprocessor is used in every aspect of the manufacturing process. In this unit, we will look at some of the other uses of computers in the CNC process. 现代制造业与计算机技术只是相互渗透，并由计算机所控制。虽然在历史上，CNC是计算机集成制造（CIM）的核心，但是，微处理器已经被应用到制造过程的方方面面中。在这一章中我们将介绍一下CNC技术中计算机的其他应用。,14.1 Computer-integrated Manufacturing Computer-integrated manufacturing (CIM) is the overall umbrella of computer management in the manufacturing process. CIM is a system whereby all aspects of a companys operation are computerized and tied to a common database. 14.1计算机集成制造 CIM犹如一把大伞，覆盖计算机对整个制造过程的管理。将公司各方面的工作都计算机化并连接到一个公用的数据库，由此形成的系统称为计算机集成制造（CIM）系统。,Text,An important element of CIM is CAD/CAM and DNC. A CIM system unifies business, engineering, process planning, inventory, manufacturing, and postproduction. A CIM system is like an orchestra. Each component duty must work with the others through a single database, central software, and an open communications network. Each task is an independent process that must work with all others. CIM的一个重要的部分就是CAD/CAM和DNC。CIM系统能将商务、工程、工艺规划、库存、加工、以及后处理整合起来。它就好像一个管弦乐队，通过唯一的数据库、中央软件以及开放的通讯网络，每一部分的工作都必须与其他部分协调完成。,Text,Many types of strategies have been formulated to increase the efficiency of operations within CIM. Chief among them are group technology (GT) and just-in-time (JIT). 为了提高CIM的工作效率人们设计出许多不同的方法。其中主要有：成组技术与准时制造。,Text,Group technology is a system for reducing needless duplication of effort. Just-in-time is a way of operating such that all unnecessary waste and invaluable elements are eliminated. 成组技术是一种减少不必要的重复性工作的系统。 准时制造是一种革除所有不必要的浪费以及没有价值的环节的操作方法。,Text,14.2 Flexible Manufacturing System A flexible machining system is a system of CNC machines, robots, and part transfer vehicles that can take a part form raw stock or casting and perform all necessary machining, part handling, and inspection operations to make a finished part or assembly. (Figure 14-1) It is an entire unmanned, software-based, manufacturing/assembly line. 14.2柔性制造系统 柔性制造系统(FMS)是CNC机床、机器人、工件传输装置的集成系统，该系统能从毛坯件或铸件开始，完成所有必须的加工，工件处理与检测，最终形成一个工件或组件成品。它完全是一个基于软件的全自动无人生产装配线。柔性制造系统由四个主要部分组成：CNC数控机床、工件装配机器人、工件/刀具传输装置。,Text,FMS is capable of round-the-clock production with little, if any, wasted time and less human intervention.Efficient use of FMS can reduce costs in two ways. They can reduce costs through more efficient part production and through lower labor costs. FMS能够进行连续不断的生产，很少有浪费时间和人工干预的情况。有效利用FMS能够在两个方面降低成本，一是提高零件生成效率一是降低人员成本。,Text,Text,Figure 14-1 A flexible manufacturing system,Key Terms,CIM Computer-integrated Manufacturing 计算机集成制造 database 数据库 DNC Direct Numerical Control 计算机直接数控 process planning 工艺规划 postproduction 后处理 inventory库存,Key Terms,GT group technology 成组技术 JIT just-in-time 准时制造 FMS Flexible Manufacturing System 柔性制造系统 part transfer vehicle 工件传送装置 raw stock 毛坯件 casting 铸件 assembly line 装配线,