机械工程专业英语-李光布lesson14-CAM.doc

机械工程专业英语-李光布lesson14-CAM 作者： 日期：10 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 formatICG images are constructedusing such basic geometric characters as points，lines，circles，and curvesOnce created，these images can be easily edited and manipulated in a variety of ways including enlargements，reductions，rotations，and movements An lCG system has three main components：hardware，which consists of the computerand various peripheral devices；software，which consists of the computer programs andtechnical manuals for the system(the popular lCG software are used in CADCAM at presentincludes AutoCAD，OADKEY，ProE，UG，I-DEAS an OATIA etc)；the human designer，themost important of the three componentsmost important of the three components A typical hardware configuration for an ICG system includes a computer，a displayterminal，a disk drive unit for floppy diskettes，a hard disk，or both；and inputoutput devicessuch as a keyboard，plotter，and printerThese devices，along with the software，are thetools modern designers use to develop and document their designs The ICG systems could enhance the design process by allowing the human designer tofocus on the intellectual aspects of the design process，such as conceptualization and makingjudgmentbased decisionsThe computer performs tasks for which it is better suited，such asmathematical calculations，storage and retrieval of data，and various repetitive operations suchas crosshatching介绍计算机辅助制造涉及利用计算机和计算机技术协助生产一种产品的所有阶段，包括过程和生产计划，加工，调度，管理和质量效益，计算机contr01.Because 。计算机辅助设计和计算机辅助制造CAD / CAM系统往往结合成“图显示为2.12 。图2.12 CAD / CAM应用信息流程图这种组合允许进入的阶段，从设计阶段的信息传输规划用于制造一个产品，而不需要重新输入零件的几何形状上的数据CAD的开发过程中manually.The数据库中的存储位置，然后进一步处理，由OAM ，进用于生产机器的操作和控制的必要的数据和指令， material.handling设备，自动化测试和检验产品质量在加工操作中， CAD / CAM的一个重要特征是它的能力来描述各种操作， ，如NO ling 和钻井R， +客栈的刀具路径。刀具的行为路径工程师或技术员可以显示和视觉检查的刀具路径可能的刀具夹头，夹具或其他干扰碰撞。刀具路径可以随时修改，以适应其他部分的形状machined.CAD / CAM系统也能够编码和分类成组份具有相似的形状，使用字母数字编码。CAD / CAM的出现，产生了重大的影响，通过标准化生产产品开发和减少设计工作量，试用，并原型work.It已可以显着降低成本和提高生产率。双引擎波音777客机，例如，被设计完全由计算机（无纸化式样） ，2 000工作站链接到八computers.The飞机的构造直接从CAD / CAM软件开发的（一个增强CATIA的系统）和没有原型或样机建成，是在以前的车型这种发展成本需要为了600 .离子。CAD / CAM的一些典型应用如下： NO ，数控，工业机器人编程。模具设计，铸造，例如，收缩津贴预编程。模具金属加工操作，如复杂的板料成形模具渐进冲压去世。设计工具广告装置及电火花电极。质量控制和检查 - 例如，设定在一个坐标测量机CAD / CAM工作站。过程规划和调度。工厂布局。2.Related技术纵观我们的工业社会的历史，许多发明已获得专利，并全新技术evolved.Whitney S概念可互换的零件，瓦特蒸汽机，福特的组装线，但也有少数发展，最值得一提的期间，我们的工业period.Each这些发展影响，因为我们制造知道它，并赢得这些人在我们的历史上当之无愧的承认books.Perhaps制造更快速，显着比任何单一发展模式，已经影响以前的技术是数字化的计算机。由于计算机技术的问世，制造的专业人士想设计过程的自动化，并使用其中的自动化开发的数据库制造processes.Computer计算机辅助设计/计算机辅助制造（ CAD / CAM ） ，成功实施时，应拆下历来存在的“墙”之间的设计和制造元件。CAD / CAM是指使用电脑的设计和制造processes.Since问世， CAD / CAM ，其他条款