数控专业英语教案

1《数控专业英语》电子教案适用班级：10级数控技术李柏华2012年9月2课题一一、章节：lesson1FiveBasicTechniquesofMachiningMetal二、教学目的：让同学们了解和掌握五种基本的金属加工工艺方法三、教学方法：讲授四、教学重点：金属成型的5种方法五、教学难点：车削和镗削六、使用教具：七、课后作业：Translation八、课后小结：lesson1FiveBasicTechniquesofMachiningMetalNewwords:1.variety［ｖə°ｒａｉəｔｉ］n.种类，变化，多样化32.unlimited［ʌｎ°ｌｉｍｉｔｉｄ］adj.无限的3.bench［ｂｅｎｔ］n.工作台4.house［ｈａｕｓ］v.安装，容纳5.solid［°ｓɔｌｉｄ］adj.坚固的，固体的，实心的n.固体，实体6.slot［ｓｌɔｔ］n.缝,槽，狭槽v.开槽7.slottingmachine插床8.slotter［°ｓｌɔｔə］n.插床，铣槽机9.straight［ｓｔｒｅｉｔ］adj.直的,整齐的10.circle［°ｓəːｋｌ］v.,n.环绕，旋转，圆圈Tranlations:Machinetoolsaremadeinagreatmanytypesandsizes.Thevarietyofmachinetoolstodayisalmostunlimited.Somearesmallenoughtobemountedonabench.Othersaresolargethattheyrequirespecialbuildingtohousethem.［1］Somearerathersimple,whileothersareverycomplicatedinconstructionandtheircontrols.Largeorsmall,simpleorcomplicated,machinetoolscanbecategorizedintofivemajorclassifications,identifiedasthefivebasictechniquesofshapingmetal.(1)Drilling.Drillingistheoperationofproducingholesinsolidmetal.Arotatingdrillcalledatwistdrillisused.Machinetoolsfordrillingholesarecalleddrillingmachines.Therearemanytypesandsizesofdrillingmachines.Thesemachinescanperformotheroperationsbesidesdrilling.Theworkpieceisheldstationary,thatis,clampedinposition,andasthedrillrotates,itisfedintotheworkpiece［2］(Fig.1-1).(2)TurningandBoring.Theenginelatheisthemostcommontypeofmachinetoolforturningwork.Turningistheoperationofcuttingorremovingmetalfromawokpiece.Acuttingtoolisfedintooralongtheworkwhiletheworkpiecerevolves(Fig.1-2).Boringistheoperationofenlargingormachiningaholethathasbeendrilledorcastintothemetal.Boringinalatheisdonebyfeedingasingle-pointcuttingtoolintotheworkasitrevolves［3］(Fig.1-3).(3)Milling.Millingistheoperationofremovingmetalbymeansofarotatingcuttingtool,whichhasmultiplecuttingedgesandiscalledamillingcutter(Fig.1-4).(4)Grinding.Grindingistheoperationofcuttingorremovingmetalbymeansofanabrasivewheelcalledagrindingwheel.Grindingfinishesworkveryaccuratelyandsmoothly.Whengrindingroundwork,theworkpiecerevolvesasitisfedagainsttheturningwheel.Whengrindingflatwork,theworkpieceispassedbackandforthundertheturningwheel(Fig.1-5).Thegrindingprocessisoftenusedforthefinalfinishingtoclosedimensionsofapartthathasbeenheat-treatedtomakeitveryhard.(5)Shaping,PlaningandSlotting.Theseoperationsaredonetoproduceormachineflat,accuratesurfaceusingsingle-pointcuttingtools.Weshouldunderstandthedifferencebetweentheshaper,theplanerandtheslottingmachines.Onashaper,the4cuttingtoolmovesbackandforthovertheworkwhiletheworkisfedagainstthecuttingtool(Fig.1-6).Onaplaner,theworkmovesbackandforthunderthecuttingtoolwhilethecuttingtoolisfedintooragainsttheworkpiece(Fig.1-7).SlottingisanOperationsimilartotheoperationperformedonashaper.Aslottingmachineisreallyaverticalshaper,thecuttingtoolofwhichmovesupanddown.［4］Inthiscase,theworkisfedagainstthecuttingtoolinastraightlineorinacircle,dependinguponthetypeofworkbeingmachined.⑤Slotter,orverticalshaper,areusedprincipallytoc5课题二一、章节：LESSON2TheMachineControlComputer二、教学目的：让同学们了解和掌握工控机的结构与功能三、教学方法：讲授四、教学重点：工控机的结构与功能五、教学难点：工控机的结构与功能六、使用教具：七、课后作业：八、课后小结：Newwords1.execution［̩ｅｋｓｉ°ｋｊｕːʃəｎ］n.实行,完成,执行,制作2.hence［ｈｅｎｓ］adv.因此,从此63.alter［°ɔːｌｔə］v.改变4.load［ｌəｕｄ］n.负载,加载vt.装载,使5.controller［ｋəｎ°ｔｒəｕｌə］n.控制器6.hardware［°ｈ�ːｄｗɛə］n.(电脑的)硬件7.software［°ｓɔｆｔｗɛə］］n.软件8.monitor［°ｍɔｎｉｔə］n.显示器，监视器v.监控9.generaltermn.总括,通称，统称10.processor［°ｐｒəｕｓｅｓə］n.处理机,处理器11.volatilememory非永久性存储器,易失存储器12.switch［ｓｗｉｔ］n.开关,转换vt.转换13.RAM(randomaccessmemory)n.［计］随机(存取)存储器14.battery［°ｂæｔəｒｉ］n.电池15.ROM(ReadOnlyMemory)［ｒɔｍ］n.只读存储器TranslationsThecomputeronnumericallycontrolledmachinescontrolstheprogramexecution,hencethiscomputerisknownasthemachinecontrolcomputerorcontroller(Fig.2-1).Thiscomputerperformstaskssimilartoapersonalcomputer,suchasloadingtheprogram,searchingthroughtheprogram,alteringanddeletinginformation,andexecutingtheprogram(programrun).［1］Fig.2-1ACNCverticalmachiningcenterequippedwithamoderncontrolthatutilizes32-bitlogicforon-screenprogramming,foreground/backgroundoperations,maintenanceandstandardfunctionsforprogramediting,andprogramexecution.Themachinecontrolcomputerconsistsoftwomaincomponents:hardware,whichisanyphysicalcomponentinacomputersystem,suchastheprocessor,monitor,memory,andinput/outputdevices;andsoftware,whichisageneraltermforprogramsstoredinthememoryinelectronicform.［2］TheCNCprogramsarestoredincomputermemory,whichalsoholdsthesoftwareneededtorunthecontrolcompute.Tochangeandalterdata,theprogrammerandtheoperatorneedtowriteintoandreadfrommemory.ThemainmemoryofacomputerisRAM(RandomAccessMemory).RAMisvolatilememory,theprogrammerandtheoperatorcaneasilychangethecontentofthismemorybywritingovertheoldprogramsandreplacingthemwithnewones.［3］OnaCNCmachinecontrolcomputer,thisiswheretheprogrammerandtheoperatorstoretheCNCprogramsandreadandwriteastheylike.Whenthepowertothemachineisturnedoff,thecontentofthismemoryislost.Tosavedatainmemorywhenthemachineisturnedoff,themachineusesits7batteries.Themachineswitchestobatteriesautomatically.Whenthebatteriesweaken,alightonthecontrolpanellightsup,warn