材料成型及控制工程专业英语配套教学课件刘瑛电子课件 Unit 19.ppt

《材料成型及控制工程专业英语配套教学课件刘瑛电子课件 Unit 19.ppt》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。

1、Unit19ComputerNumericalControl计算机数字控制Objective3.2.4.5.1.UnderstandtheconceptofCNC;BefamiliarwiththetermsrelatedtoCNC;UnderstandthetwobasicCNCinterpolations（插补）;Befamiliarwiththeconstructionofverticalmachiningcenters;HaveagoodunderstandingoftheadvantagesanddisadvantagesofCNC.Asastudentmajoredinma

2、terialforming;youmusthaveeverseenorevenoperatedCNCmachines.WatchVideo19-1anddiscussthefollowingquestionsinyourgroup.(1)Theuseofcomputernumericalcontroliswidespreadinmanufacturing,forexampleinturning.CanyoulistmoreapplicationsofCNCinmanufacturing?(2)HowdoyougenerateaCNCpartprogram?(3)Whatisamotio

3、naxisofaCNCmachine?HowmanyaxesdoesaCNCmachineusuallyhave?Task1Warmingup（1）Theuseofcomputernumericalcontroliswidespreadinmanufacturingandisusedinturning,milling,holemaking,welding,electricaldischargemachining,abrasivewaterjetcutting,punching,lasercuttingandmanyotheroperations.（2）Partprogramsarepr

4、imarilygeneratedbyeithermanualprogrammingofcommandsormorecommonlybytheuseofcomputer-aidedpartprogrammingsystems.（3）ThedirectionofeachcontrolledmotionofaCNCmachinesisknownasanaxis.Dependinguponthemachinetype,thenumberofaxesavailableforcontrolcommonlyrangesfrom2to5.AnswerWarmingupTermStudyVertical

5、machiningcentersarethetypicalrepresentativeofCNCmachines.StudyFig.19-1andmatchthetermsincolumnAwiththedescriptionsincolumnB.Task2Fig.19-1Thecomponentsofaverticalmachiningcenter.Task2AB(1)spindle（轴）AApartofamachine,whichcontainsthemachine'sspindle.(2)addleBApartofamachine,whichismountedtothebedan

6、dslidesalongtheyaxisonaverticalmachiningcenter.(3)machinebedCApartofamachine,whichrestsonthefloor.(4)machinetableDApartbeingmachined.(5)headstock（主轴箱）EApartofamachine,towhichworkholdingdevicesaremounted(安装的).(6)workpieceFApartofamachine.Itrotatesatahighspeedtogetherwiththetoolorworkpieceheldinit

7、whenthemachineisrunning.（1）F（2）B（3）C（4）E（5）A（6）DAnswerTermStudyReadtheTextandanswerthefollowingquestions.(1)WhatisthebasicfunctionofCNCmachine?(2)WhatareprogrammablewithalmostallCNCmachinetools?(3)Whatarethetwomostpopularcoo