教学材料《数控技术英语》-Unit 2 the Components of NC Machine Tool

TextNCmachinetoolsgenerallyconsistofinputdevice，servosystem，measuringfeedbackdeviceandthemainbodyofthemachinetool(composedofmechanicalparts)，asshowninfigure2-1.1．Input/OutputDevice(1)OperationPanelItconsistsofthetoolswhichareusedforcommunicationbetweenoperatorsandNCdevices:buttonstation/statelamp/keyarray/display.Thefollowingfigure2-2showsanoperationpanelofSiemensNCsystem.下一页返回Text(2)ControlMediumInrunningNCmachinetool,theworkersdonotneedtooperateamachinebyshakingahandle.But,NCmachinetoolisneededtoexecutetheperson’sinventions.Thus,someconnectionmustbebuiltbetweenpersonsandNCmachinetools.Themediumoftheconnectionisreferredtoascontrolmedium(orprogrammedium,inputmedium,informationcarrier).下一页上一页返回Text(3)Man-machineInteractiveDevicesInrunningNCmachinetool,anoperatorinterferesNCsystem,edits,modifiesandsetsthemachiningprograminput,displaystherunningstateofNCmachinetool,andsoon.Thatistosay,NCmachinetoolshavethefunctionofman-machineinteraction.Thedeviceswiththefunctionofman-machineinteractionarecollectivelycalledman-machineinteractivedevices.Thecommonman-machineinteractivedevicesinvolvekeyboard,displayandphotoelectricreader,andsoon.下一页上一页返回Text(4)CommunicationInadditiononusingI/Odevicestoexchangetheinformation,themodernNCsystemiscapableofexchanginginformationbyusingcommunication.TheyarethebasictechnologyofrealizingtheintegrationofCAD/CAM,FMSandCIMS.下一页上一页返回Text2.ComputerNumericalControlDeviceNumericalcontroldeviceisthemaincentreofNCmachinetool.Thegeneralnumericalcontrolmachinetoolconsistsofinputdevice,memory,controller,arithmeticunitandoutputdevice.NCdevicesreceivetheinformationfrominputmediumandrecognize,store,manipulatethecode,thenoutputthecorrespondingpulsetodriveservosystemforcontrollingthemovementsofmachinetools.Inacomputernumericallycontrolledmachinetool,sincethecomputeritselfcontainsarithmeticunit,controller,theroleofNCdeviceisperformedbyacomputer.Thefollowingfigure2-3showscomputernumericalcontroldevice.下一页上一页返回Text3.FeedServoDriveSystemFeedservodrivesystemconsistsofservocircuit,poweramplifiercircuitandservomotor.Theroleofitsistoconvertthepulsesignalfromnumericalcontroldeviceintothemotionofthemovementcomponentsofamachinetool,whichmakesatable(orsaddle)precisepositionorperformrelativemotionstrictlyasthegivenpath.Finally,thepartwhichmeetstherequirementofdrawingsismachined.下一页上一页返回Text4.MachineElectricControlMachineelectriccontrolincludestwoaspects,programmablelogiccontroller(PLC)andI/Ocircuit.5.MeasuringfeedbackdeviceThedeviceconsistsofdetectioncomponentsandcorrespondingcircuit,containedinservesystem.Itsroleistodetectvelocityanddisplacementandreturnfeedbackforformingclosedloopsystem.Thecommonmeasuringdeviceusedarepulseencoder,rotarytransformer,inductosyn,gratingandmagneticfeet.Thefollowingfigure2-4showsameasuringdeviceinNCsystem.下一页上一页返回Text6.ThemainbodyofamachineThehostmachineisthemainbodyofmachine.Itincludesthebed,base,column,beam,slide,table,headstock,feedmechanism,toolpostandautomatictoolchanger,ItisthemechanicalpartswhichperformvariousmachiningautomaticallyonNCmachine.7.AuxiliarydevicesofNCmachinetoolsAuxiliarydevicesarenecessarysupportingdeviceswhichensuretogivefullplaytothefunctionofNCmachinetools.Thecommonauxiliarydevicesarehydraulic,pneumaticdevice,chipremovaldevice,cooling,lubricationdevice,androtaryworking-table,NCdividinghead,protection,lightingandotherauxiliarydevices.上一页返回WordsandExpressionsstandardadj.标准的,,正常的;n.标准,,规范discn.磁盘,圆盘,唱盘,唱片operatevt.&vi.操作,运转;vt.操作,控制,使运行executevt.执行,贯彻,实行,实施,完成;vi.执行,履行decodevt.译码inputn.输入,输入的数据;vt.把…输入电脑output输出operatevt.&vi.1转,操作;2.经营,管理,营业;mediumn.媒介,手段,方法;adj.中等的,适中的executevt.1.执行,贯彻,实施;vi.执行,履行,实行holen.洞,孔;vt.&vi.(在…上)打洞或穿孔transformern.变压器下一页返回WordsandExpressionsservomechanismn.自动驾驶装置,伺服机构punchvt.1.冲孔;2.打印记,打标记;decodevt.1.译(码),解(码);2.分析及译解电子信号photoelectricadj.光电的informationn.1.消息,资料,情报;2.通知,告知;auxiliaryadj.1.（工人）辅助的;2.（设备）备用的;n.1.助动词;2.辅助工,辅助人feedvt.1.喂养,为…提供食物;2.进给;feedbackn.1.反馈,反馈信息;差);2.回复,反应,反作用circuitn..电路,线路;下一页上一页返回WordsandExpressionsamplifiern.扩音器,放大器,扬声器;convertvt.&vi.(使)转变,(使)转化;vi.可转变为,可变换成;vt.改变tablen.桌子,台子,工作台;bedn.床,床位;vt.把…固定在columnn.1.圆柱,立柱;2.栏,专栏(文章)headstockn.主轴箱automatictoolchanger自动换刀机构measuringfeedbackdevice测量反馈装置下一页上一页返回WordsandExpressionstoolpost刀架hostmachine机床主机chipremovaldevice排屑装置rotaryworking-table回转工作台punchedcard穿孔卡punchedtape穿孔带binary-codedecimal二-十进制代码ElectronicIndustriesAssociation(EIA)美国电子工业协会StandardInformationCode(ISO)标准信息代码giveplayto发挥,表现出内在的能力NCdividinghead数控分度头machinecontrolunit(MCU)机床控制单元上一页返回Notes1.NCmachinetoolsgenerallyconsistofinputdevice，servosystem，measuringfeedbackdeviceandthemainbodyofthemachinetool.

数控机床一般由输入装置、数控系统、伺服系统、测量反馈装置和机床本体组成。注：consistof由……组成2．ItconsistsofthetoolswhichareusedforcommunicationbetweenoperatorsandNCdevices.

它是操作人员与数控装置进行信息交流的工具组成。注：句中thetools是先行词，其后which所引导的是定语从句，起修饰作用。下一页返回Notes3.Thus,