1、Chapter 3 Mechanical DesigningChapter 3 Mechanical DesigningWarming-upListeningSpeakingReadingWriting&TranslationChapter 3 Mechanical DesigningObjectivesAfter studying this chapter,you are able to:master some expressions about product municate with a client about the design requirements of a product
2、.discuss the design of a product with colleagues and make a presentation of the design to the client.describe the functions and application of CAD and CAM.introduce the production process and status to clients.Chapter 3 Mechanical DesigningWarming-upChapter 3 Mechanical DesigningTask 1 Do you know t
3、he following English words?Please match the words with the following pictures.robot conveyor stamping machine chisel welding steel sheet steering wheel roll engine protective clothChapter 3 Mechanical DesigningTask 2 Listen to the news report and answer the questions.One of the worlds largest indust
4、rial robot makers begins operations at its new Shanghai factory on Tuesday.German robot manufacturer Kuka is aiming for multi-million euro orders for its high-tech machinery from Chinas automotive industry.Germanys table tennis champion takes on the fastest robot in a ping pong battle.Thats the type
5、 of machinery that will be produced in Kukas new plant in Shanghai,the first in the country for the Augsburg-based robot maker.China is projected to become the biggest market for industrial robotics by 2019.Right now Chinese robot products only make up about a tenth of the Chinese market.Questions：1
6、.Do you think it is important to ponder more about homo-robo relations?2.What should we do with the arrival of increasingly humanoid automatons in workplaces?Chapter 3 Mechanical DesigningListeningChapter 3 Mechanical DesigningTask 1 Listen carefully and fill in the blanks with the word you hear on
7、the tape.Machine design is the application of 1 and 2 to devise new or 3 products for the 4 of satisfying human 5 .It is a vast field of 6 technology that not only 7 itself with the original conception of a product in terms of its 8 ,9 ,and 10 details but also considers the various factors involved
8、in the manufacture,marketing and the use of the product.Chapter 3 Mechanical DesigningTask 2 Listen carefully and fill in the blanks with the word you hear on the tape.A large 1 CAM system 2 a 3 structure of two or three 4 of computers that are used to control and 5 individual process tasks.A small
9、computer is 6 for the management of a 7 process with a larger computer monitoring and 8 instructions to a group of small computers.A 9 computer then feeds the system with 10 information.A large scale CAM system 11 three major areas related to the manufacturing process:production management and contr
10、ol;engineering 12 and 13 ;and finance and marketing.Each is comprised of subtasks that are controlled either directly form a large computer,or by a small computer,as in the case of inspection14 control.Regardless of the control method,the important strength of CAM is that a 15 flow of information oc
11、curs.Chapter 3 Mechanical DesigningTask 3 Visiting Metal Processing Workshop.Choose the best answer according to the dialogue.Gu Jie is showing John Turner around the workshop.Gu Jie introduces to John Turner the turning and milling machines in the workshop.John Turner asks about the use of turning
12、machines and the positions of main spindle and tailstock.Mr.Gu explains to him what are processed here and gives John a clear idea of how compact a turning machine can be.Chapter 3 Mechanical Designing1.Where does the conversation take place?()A.Office B.Workshop C.Warehouse2.How many types of machi
13、ne tools are used in Mr.Chens workshop?()A.Two B.Four C.Three3.What machine tools are mainly used for machining shaft components and case typed parts?()A.Milling machines B.Turning machines C.Both A and B4.Different _ will lead to different machining effects.A.shafts B.machines C.cutting tools5.John
14、 Turner thinks that turning machines are _.A.useful B.marvelous C.commonChapter 3 Mechanical DesigningTask 4 You have 2 colleagues,they are talking about CAM now.Listen to the conversation and answer the following questions.1.What is CAD?2.How do CAD and CAM systems work together in manufacture?3.Wh
15、at is the main function of CAM?4.What is the manufacturing process controlled by in a CAM system?5.What are the advantages of CAM mentioned in the talk?Please note down one of them.Chapter 3 Mechanical DesigningSpeakingChapter 3 Mechanical DesigningTask 1 Try to explain how this simple mechanism ope
16、rates using whatever English you know.Work in pairs describe your explanation to your partner.Note:Four-bar linkage(四平杆),crank-rocker linkages(曲柄摇杆机构)L1:a crankL2:a coupler or a followerL3:a rockerL4:fixed linkChapter 3 Mechanical DesigningTask 2 Work with your partner to match each symbol with its
17、indication.Then draw any of the symbols on a piece of paper and take turns to tell your partner its meaning and where it can be seen.1.This symbol indicates that lethal accidents or serious injuries may occur if the operating and working instructions are not followed properly.2.This symbol draws you
18、r attention to something particular.3.This symbol warns against dangerous voltage!Immediate death might be the consequence.4.This symbol informs the user that the system or its components may be damaged if the working and operating instructions are not followed.5.This symbol indicates compulsory act
19、ions that must be performed by the operator.Chapter 3 Mechanical Designing6.This symbol indicates prohibitive actions that must not be performed by the operator.Task 3 Work in pairs.A is now presenting the prototype of electric scooter to B.Make a conversation with your partner according to the info
20、rmation given below.Chapter 3 Mechanical DesigningA：Ask about the appearance.Want to know about the speed.Enquire about weight.Wonder whether there is any other information.Show your satisfaction.B：Bright orange color;34 inches long,7 inches wide,and 35 inches from deck to handlebars;tough,aluminum
21、body.15 miles per hour at most.Light enough to be carried into the office;19.5 pounds in weight;easy to fold up.Low deck height;easy kick scooting;completely redesigned motor controller;improved performance.Chapter 3 Mechanical DesigningReadingChapter 3 Mechanical DesigningText APlastic MoldingPlast
22、ics can be molded into various forms and hardened for commercial use.Plastic molding products can be seen everywhere.Examples are jars,protective caps,plastic tubes,toys,bottles,cases,accessories,kitchen utensils and a lot more.The keyboard and the mouse that you use are made through plastic molding
23、 and even the plastic parts of the chair that you are sitting on are created this way.Chapter 3 Mechanical DesigningThe basic idea in plastic molding is inserting molten liquid plastic into a ready shaped mold,for example,the mold of a bottle.It will be then allowed to cool,then the mold will be rem
24、oved to reveal the plastic bottle.If you are planning to go into plastic molding business,you should first know the different processes.Here are basic definitions of various methods of plastic molding.Injection MoldingIn Injection Molding,melted plastic is forced into a mold cavity.Once cooled,the m
25、old can be removed.This plastic molding process is commonly used in mass-production of a product.Injection molding machines were made in the 1930s.These can be used to mass produce toys,kitchen utensils,bottle caps,and cell phone stands.Chapter 3 Mechanical DesigningBlow MoldingBlow molding is like
26、injection molding except that hot liquid plastic pours out of a barrel vertically in a molten tube.The mold closes on it and forces it outward to conform to the inside shape of the mold.When it is cooled,the hollow part is formed.Examples of blow molding products are bottles,tubes and containers.Com
27、pression MoldingIn this type of plastic molding,hard plastic is pressed between two heated mold halves.Compression molding usually uses vertical presses instead of the horizontal presses used for injection and blow molding.The parts formed are then air-cooled.Rotational MoldingHollow molds packed wi
28、th powdered plastic are secured to pipe-like spokes that extend from a central hub.The hub swings the whole mold to a Chapter 3 Mechanical Designingclosed furnace room causing the powder to melt and stick to the insides of the tools.As the molds turn slowly,the tools move into a cooling room.Here,sp
29、rayed water causes the plastic to harden into a hollow part.Chapter 3 Mechanical DesigningNew Words and Expressionsbarrel brl n.圆筒，adj.筒状物体cavity kvt n.腔，凹处container knten(r)n.容器furnace fns n.熔炉harden hdn v.变硬，凝固hollow hl adj.中空的；n.坑，洞hub hb n.轮轴，轮毂jar d(r)n.瓶，罐mass ms n.大量，大块；vt.(使)集中，聚集molten mltn
30、 adj.融化的，熔融状的outward atwd adv.向外，在外；adj.向外的，外面的powder pad(r)n.粉末；v.涂粉reveal rvil v.揭露，显露出，展现出Chapter 3 Mechanical Designingrotational rtenl adj.转动的，旋转的spoke spk n.轮辐，(车轮的)辐条spray spre v.喷洒，喷射swing sw v.使旋转，使摆动tube tjub n.管，管状物utensil jutensl n.器 皿，用具vertically vtkl adj.垂直的conform to 和一致Injection Mol
31、ding 注塑成型Blow molding 吹塑成型Compression molding 压缩成型Rotational molding 滚塑成型Chapter 3 Mechanical DesigningNotes：不同塑模成型工艺区别示意图Injection Molding注塑成型Chapter 3 Mechanical DesigningBlow Molding吹塑成型Chapter 3 Mechanical DesigningCompression Molding压缩成型Chapter 3 Mechanical DesigningRotational Molding 滚塑成型Chapt
32、er 3 Mechanical DesigningTask 1 Answer the following questions according to the text.1In addition to the items mentioned in the text,can you make some other examples of plastic molding products in your daily life?2What did the invention of injection molding machines mean to the manufacturer?3What is
33、 the difference between injection molding and blow molding?4What is the difference in terms of raw material among the four types of plastic molding?Task 2 Match the English expressions with their Chinese meanings.1.plastic molding A.批量生产2.vertical presses B.管状胚料3.mold cavity C.管状轮辐4.injection moldin
34、g D.模具型腔Chapter 3 Mechanical Designing5.air-cooled E.注塑成型6.protective caps F.空心件7.hollow part G.塑料成型8.mass production H.安全帽9.molten tubeI.立式压力机10.pipe-like spokes J.冷却Task 3 Please write out the words in according to their definitions.The first letters are already given.1.c_ a box,bottle,etc.in whic
35、h something can be stored or transported.2.b_a large round container,usually made of wood or metal,with flat ends and,usually,curved sides.3.o_going away from a particular place,especially one that you are going to return to.Chapter 3 Mechanical Designing4.r_the action of an object moving in a circl
36、e around a central fixed point.5.s_to cover sb/sth with very small drops of a liquid that are forced out of a container or sent through the air.6.i_an act of forcing liquid into something.7.c_press or squeeze sth so that it takes up less space.8.v_something stands or points straight up.Task 4 Transl
37、ate the following passage into Chinese.Hollow molds packed with powdered plastic are secured to pipe-like spokes that extend from a central hub.The hub swings the whole mold to a closed furnace room causing the powder to melt and stick to the insides of the tools.As the molds turn slowly,the tools m
38、ove into a cooling room.Here,sprayed water causes the plastic to harden into a hollow part.Chapter 3 Mechanical DesigningText BMold Design and ManufacturingCAD and CAM are widely applied in mold design and mold making.Computer-Aided Manufacturing(CAM)can be defined as the use of computer systems to
39、plan,manage,and control the operations of a manufacturing plant through either direct or indirect computer interface with the plants production resources.CAM functions center around four main areas:numerical control,process planning,robotics,and factory management.Numerical Control(NC)Numerical cont
40、rol uses coded information to control machine tool movements.In modern CNC systems,end-to-end component design is highly automated using CAM programs.The programs produce a computer file that is interpreted to extract the commands needed to operate a particular machine,and then loaded into the CNC m
41、achines for production.Chapter 3 Mechanical DesigningProcess PlanningProcess planning is involved with the detailed sequence of production steps from start to finish.Essentially,the process plan describes the state of the workplace at each workstation.The use of computers as an aid to process planni
42、ng is comparatively recent and has led to a rebirth of what is known as group technology(GT).Group technology is based on organizing all similar parts into families to allow standardization of manufacturing steps.Chapter 3 Mechanical DesigningCurrently a process planning system is under development
43、and it is able to produce process plans directly from the geometric model database with almost no human assistance.In this system,the process planner would review the impact from the design engineer via communication and then enter this input into the CAM system which would generate a complete set o
44、f process plans automatically.RoboticMany advances are being made to integrate robotics into CAM.One of these efforts is the US Air Force Integrated Computer-Aided.Manufacturing(ICAM)project,of which the goal is to organize every step of manufacturing around computer automation.As part of this progr
45、am,a robot is used to drill sheet metal aircraft parts.The robot drills a set of holes to 0.005 in tolerance,and machines the perimeter of any one of 250 types of parts.Production rates are four times faster than conventional manual manufacturing.Chapter 3 Mechanical DesigningFactory ManagementThis
46、portion of CAM ties together the other areas to coordinate operations of an entire factory.The management system relies heavily on group technology with its families of similar parts.Computers also perform various management tasks such as inventory control and material requirements planning(MRP)syst
47、ems.Chapter 3 Mechanical DesigningNew Words and Expressionsaircraft ekrft n.飞机，飞行器assistance sstns n.帮助，援助coded kdd adj.编码的coordinate kdnet v.协调database detbes n.数据库drill drl n.钻头；v.钻(孔)，打(眼)essentially senl adv.本质上extract ekstrkt v.摘取，选取，提取 n.摘录generality denrlt n.普遍性interface ntfes n.接口，接口处interpr
48、et ntprt v.解释，翻译inventory nvntr n.库存load ld v.加载，装入程序Chapter 3 Mechanical Designingmachine min v.以机器制造numerical njumerkl adj.数字的perimeter prmt(r)n.周边，周长previously privsl adv.先前的，以前review rvju v.审查，回顾sequence sikwns n.系，一连串tolerance tlrns n.(偏离标准的)容许误差，公差be defined as 被定义为centre around 以为中心，围绕rely on
49、 依赖，依靠Chapter 3 Mechanical DesigningTask 5 Discuss with your partner about the benefits of application of CAM in the factory.Task 6 Please write out the words in according to their definitions.The first letters are already given.1.n_relating to numbers;expressed in numbers.2.g_the quality of being g
50、eneral rather than detailed or exact.3.c_to organize the different parts of an activity and the people involved in it so that it works well.4.p_the total length of the outside edge of an area or a shape.5.i_all the goods in a shop.6.d_an organized set of data that is stored in a computer and can be
