机械专业英语董建国第26章ppt课件

1、Unit 26TEXT READING MATERIAL Unit 26Unit 26TEXTComputer Integrated Manufacturing System Computer integrated manufacturing or CIM is the term used to describe the most modern approach to manufacturing. Although CIM encompasses many of the other advanced manufacturing technologies such as computer num

2、erical control (CNC), CAD/CAM, robotics, and just-in-time delivery (JIT), it is more than a new technology or a new concept. Computer integrated manufacturing is actually an entirely new approach to manufacturing or a new way of doing business.Unit 26 To understand CIM, it is necessary to begin with

3、 a comparison of modern and traditional manufacturing. Modern manufacturing encompassed all of the activities and processes necessary to convert raw materials into finishes products, deliver them to the market, and support them in the fields. These activities include the following:Unit 26(1) Identif

4、ying a need for a product.(2) Designing a product to meet the needs.(3) Obtaining the raw materials needed to produce the product.(4) Applying appropriate processed to transform the raw materials into finished products.(5) Transporting product to the market.(6) Maintaining the product to ensure a pr

5、oper performance in the field.Unit 26 This broad, modern view of manufacturing can be compared with the more limited traditional view that focuses almost entirely on the conversion processed. The old approach separates such critical preconversion elements as market analysis research, development, an

6、d design for manufacturing, as well as such after-conversion elements as product delivery and product maintenance. In the other word, in the old approach to manufacturing, only those processes that take place on the shop floor are considered manufacturing. Unit 26 This traditional approach of separa

7、ting the overall concept into numerous stand-alone specialized elements was not fundamentally changed with the advent of automation. While the separate elements themselves became automated (i.e., computer aided drafting and design (CAD) in design and CNC in machining), they remained separate. Automa

8、tion alone did not result in the integration of these islands of automation.Unit 26 With CIM, not only are the various elements automated, but also the islands of automation are all linked together or integrate. Integration means that a system can provide complete and instantaneous sharing of inform

9、ation. In modern manufacturing, integration is accomplished by computers. With this background, CIM can now be defined as the total integration of all manufacturing elements through the use of computers. Progress is being made toward the eventual full realization of CIM in manufacturing. When this i

10、s accomplished, fully integrated manufacturing firms will realize a number of benefits from CIM:Unit 26(1) Product quality increases.(2) Lead times are reduced.(3) Direct labor costs are reduced.(4) Product development times are reduced.(5) Inventories are reduced.(6) Overall productivity increases.

11、(7) Design quality increased.Unit 26NEW WORDS AND PHRASESencompass In5kQmpEs v. 包含或包括包含或包括某事物某事物delivery dI5lIvErI n. 递送，交付递送，交付performance pE5fC:mEns n. 履行，执行履行，执行conversion kEn5v:F(E)n n. 变换，转化变换，转化advent 5Advent n. 出现，到来出现，到来background 5bAkraJnd n. 背景，背景，后台后台instant 5Inst(E)nt adj. 立刻的，立刻的，直接的直接的

12、maintenance 5meIntInEns n. 维护，坚持维护，坚持computer integrated manufacturing system(CIMS) 计算机集成制造系计算机集成制造系统统lead time 交货时间交货时间Unit 26NOTES 1It is more than a new technology or a new concept. 与其说它与其说它(CIM)是一个新的方法，还不如是一个新的方法，还不如说是一个新的概念。说是一个新的概念。 句型句型more thanor意为意为“与其与其不如不如。 2Modern manufacturing encompass

13、ed all of the activities and processes necessary to convert raw materials into finished products, deliver them to the market, and support them in the fields. 现代制造包括了把原资料转换成废品、把现代制造包括了把原资料转换成废品、把产品投向市场和进展售后效力所必需的一切产品投向市场和进展售后效力所必需的一切活动和过程。活动和过程。Unit 26 necessary to do是描画词短语，作the activities and proces

14、ses的后置定语，意为“必需的。 3. This traditional approach of separating the overall concept into numerous stand-alone specialized elements was not fundamentally changed with the advent of automation. 这种传统的将整个概念分割成许多独立的公用单元的方式 并没有随着自动化的出现而发生根本性的变化。 分词短语separating the overall concept into numerous stand-alone spe

15、cialized elements在这里作介词of的宾语。 Unit 264Progress is being made toward the eventual full realization of CIM in manufacturing.制造业在最终完全实现制造业在最终完全实现CIM的方向正在获得进展。的方向正在获得进展。 full realization of意为完全实现。意为完全实现。Unit 26EXERCISES 1Place a“Tafter sentences that are true and an“Fafter those that are false: (1) CIMS

16、 is a new type of enterprise.( ) (2) Transporting product to the market is not encompassed in modern manufacturing.( ) (3) traditional manufacturing encompasses all of the activities and processes necessary to convert raw materials into finished products.( ) (4) While such separate elements as CAD o

17、r CAM themselves became automated, integration of these islands of automation will fully realize.( ) (5) In modern manufacturing, integration is accomplished by computers.( )Unit 26 2Answer the following questions: (1) What does CIMS means? (2) Whats the difference between modern and traditional man

18、ufacturing? (3) What can we benefit from CIMS? 3Fill the following blanks with appropriate words:Unit 26 ( ) or CIM is the term used to describe the most modern approach to manufacturing. Although CIM encompasses many of the other advanced manufacturing technologies such as computer numerical contro

19、l ( ), CAD/CAM, robotics, and just-in-time delivery ( ), it is more than a new technology or a new ( ). Computer integrated manufacturing is actually an entirely new approach to manufacturing or a new way of ( ).Unit 26 To understand CIM, it is necessary to begin with a comparison of modern and trad

20、itional manufacturing. Modern manufacturing encompassed all of the activities and processes necessary to convert raw materials into ( ), deliver them to the market, and support them in the fields. These activities include the following. This broad, modern view of manufacturing can be compared with t

21、he more limited ( ) view that focuses almost entirely on the conversion processed. Unit 26 In the other word, in the old approach to manufacturing, only those processes that take place on the ( ) floor are considered manufacturing. This traditional approach of ( ) the overall concept into numerous s

22、tand-alone specialized elements was not fundamentally changed with the advent of automation. While the separate elements themselves became ( ), they remained separate. Automation alone did not ( ) in the integration of these islands of automation.Unit 26READING MATERIAL The Factory of the Future The

23、 concept of the “factory of the future has been developed in response to the change in consumer preferences in modern society characterized by shorter product life cycles. The shorter cycle means more competitive products, more products being introduced, more products phasing out, and results in low

24、er order quantities. In this sense, the age of mass production is gone and the era of flexible production is being started. Unit 26 The requirement for flexible production systems dictates the specifications of the factory of the future: (1) Rapid introduction of new products. (2) Quick modification

25、s in products of similar function. (3) Manufacturing of small quantities at competitive production costs. (4) Consistent quality control. (5) Ability to produce a variety of products. (6) Ability to produce a basic product with customer-requested special modification. Unit 26 The core of the factory

26、, which meets these specifications, is the computer-integrated manufacturing (CIM) system. The CAD/CAM process shortens the time between the concept point of a new product to its manufacturing; the FMS can produce the new product by loading a new program into its supervisory computer; the automatic

27、assembly lines can accommodate the problem of assembling a variety of products with customer-tailored modifications; and automatic inspection maintains the high quality. All this is achieved with few workers on the shop floor. Only material-handling systems, automatic controls, and industrial robots

28、 are performing on shop floor, under limited and remote human monitoring. Unit 26 Therefore, the factory of the future will not contains locker rooms, the showers, and cafeteria facilities. Furthermore, automatic systems, CNC machines, and robots, the basic components of a CIM system, do not need light or heating to operate. Thus, the factory of the future will be dark and