.word格式, Lesson14 CAMIntroduction computeraided manufacturing involves the use of computers and computer technology toassist in all the phases of manufacturing a product，including process and production planning，machining，scheduling，management，and quality contr01Because of the benefit，computer。aided design and computeraided manufacturing are often combined into CADCAM systemsshow as Figure 212Figure 212 Information flow chart in CADCAM application This combination allows the transfer of information from the design stage into the stage ofplanning for the manufacture of a product，without the need to reenter the data on part geometrymanuallyThe database developed during CAD is stored，then it is processed further，by OAM，intothe necessary data and instructions for operating and controlling production machinery，materialhandling equipment，and automated testing and inspection for product quality In machining operations，an important feature of CADCAM is its capability to describe thetool path for various operations，such as NO turningmillingand drilling r、+inn。the tool pathThe engineer or technician can then display and visually check the tool path forpossible tool collisions with clamps，fixtures，or other interferences The tool path can be modified at any time，to accommodate other part shapes to bemachinedCADCAM systems are also capable of coding and classifying parts into groups thathave similar shapes，using alphanumeric coding The emergence of CADCAM has had a major impact on manufacturingby standardizingproduct development and by reducing design effort，tryout，and prototype workIt has madepossible significantly reduced costs and improved productivityThe twoengine Boeing 777passenger airplane，for example，was designed completely by computer(paperless design)，with 2 000 workstations linked to eight computersThe plane is constructed directly from thedeveloped(an enhanced CATIA system)CADCAM software and no prototypes or mockupswere built，which were required for previous modelsThe cost for this development was on theorder of$6 bion Some typical applications of CADCAM are as follows： Programming for NO，CNC，and industrial robots Design of dies and molds for casting，in which，for example，shrinkage allowances arepreprogrammed Dies for metalworking operations，such as complex dies for sheet forming andprogressive dies for stamping Design of tools ad fixtures and EDM electrodes Quality control and inspection-for instance，coordinatemeasuring machines programmed on aCADCAM workstation Process planning and schedulingPlant layout2Related Technologies Throughout the history of our industrial society，many inventions have been patented andthe whole new technologies have evolvedWhitneyS concept of interchangeable parts，WattS steam engine，and FordS assembly line are but a few developments that are most noteworthyduring our industrial periodEach of these developments has impacted manufacturing as weknow it，and has earned these individuals deserved recognition in our history booksPerhapsthe single development that has impacted manufacturing more quickly and significantly than anyprevious technology is the digital computer Since the advent of computer technology，manufacturing professionals have wanted toautomate the design process and use the database developed therein for automatingmanufacturing processesComputeraided designcomputeraided manufacturing(CADCAM)，when successfully implemented，should remove the“wall”that has traditionally existedbetween the designs and manufacturing components CADCAM means using computers in the design and manufacturing processesSince theadvent of CADCAM，other terms have developed Computer graphics(CG)Computeraided engineering(CAE) Computeraided design and drafting(CADD) Computeraided process planning(CAPP) These spin-off terms all refer to specific aspects of the CADCAM concept，CADCAM itself is a broader，more inclusive termIt is at the heart of automated and integrated manufacturing A key goal of CADCAM is to produce data that can be used in manufacturing a product while developing the database for the design of that productWhen successfully implemented，CADCAM involves the sharing of a common database between the designs and manufacturing components of a company Interactive computer graphics(10G)plays an important role in CADCAMThrough theuse of lCG，designers develop a graphic image of the product being designed while storing thedata that electronically make up the graphic imageThe graphic image can be presented in atwodimensional(2-D)threedimensional(3一D)，or solids f