第1題Highmachiningaccuracy,(),highautomation,lowlaborintensityandhighproductionefficiencyarethemachiningcharacteristicsofCNCmachinetools.AMachiningpartswithsimplecontourandmassproductionBStrongadaptabilitytoprocessingobjectsCAsinglepieceofpartswhichisdifficulttofitormustrelyonmanualcorrectionandpositioninginordertomachiningaccuracy.DSuitableformachiningbilletwithspeciallargeallowanceandunevenmaterialandallowance.第2題ThecomponentsofCNCmachinetoolincludeinputdevice,CNCdevice,(),()andmechanicalparts.AMulti-stagegearshiftsystemBPositionfeedbacksystemCPLCdevicesDServosystem正確答案：BD第3題Thedifferencebetweenclosed-loopcontrolsystemandsemi-closed-loopcontrolsystemis().AServomotorsBSensorsCSensorinstallingpositionDServomotorinstallingposition第4題"NC"means().ANumericalcontrolBComputernumericalControlCNetworkcontrolDDirectcontrol第5題Theadvantagesofcomputernumericalcontrolsystemsdonotinclude().AUsingsoftwaretochangethefunctionofNCsystemflexibly,highflexibilityBMakingfulluseofcomputertechnologyanditsperipheralequipmenttoenhancethefunctionofnumericalcontrolsystem;CThefunctionofNCsystemisrealizedbyhardware,andthereliabilityishighDThesystemperformancepriceratioishighandtheeconomyisgood第6題Theservomotorofopen-loopcontrolsystemofNCmachinetoolmostlyadopts().ADCservomotoBACservomotoCACvariablefrequencyspeedmotoDPowerSteppingMoto第7題Amachinetoolwithanopenloopfeedservosystemusuallydoesnotinstall().AServoSystemBBrakeCCNCsystemDPositiondetectiondevices第8題Accordingtocertaincalculationmethods,theprocessofcompletingthespecifiedtrajectorybyassigningpulsestoeachaxis,iscalledinterpolation.第9題PulseequivalentistheminimumsetunitofdisplacementofNCmachinetoolNCaxis.Thesmallerthevalueofpulseequivalent,thelowertheinterpolationaccuracy.第10題CNCmachinetoolprocessingdependsonvariousdigitalinformation.第1題Iftheactualtooldoesnotmatchthelengthoftheprogrammingtool,the()canbeusedtocorrectitwithoutchangingtheoriginalprogram.ALeftToolCompensationBRightToolCompensationCLengthCompensationDCallingasubroutine第2題Amongthefollowingcode,thecodefordifferentgroupsis().AG02BG03CG41DG01第3題Amongthefollowinginstructions,theinstructionthatdoesnotcauseanymovementofthemachinetool,butchangestheworkpiececoordinatesystemthatwillmakethemachinetoolscreendisplayis().AG92XYZBG03XYZCG01XYZDG00XYZ第4題ThevaluessetintheG54are().AOriginofworkpiececoordinatesystemBOffsetoforiginofworkpiececoordinatesystemrelativetooriginofmachinetoolcoordinatesystemCLengthdeviationvalueoftoolDOffsetofworkpiececoordinatesystemoriginrelativetotoolalignmentpoint第5題WhichofthefollowingcodeshasthesamepurposeasG56inaCNCsystem?()AG50BG54CG03DG43第6題AlltheI、J、K、Rvaluesinarcprogrammingarepositiveornegative.第7題ToolcompensationprogramsegmentmusthaveG02orG03functionstobeeffective.第8題Thecoordinatesystemofmachinetoolisthecoordinatesystemestablishedwiththeprogrammingoriginasthecoordinateorigin.第9題Usingthetoolradiuscompensationfunction,theroughandfinishmachiningofthesamepartcanberealizedwithoutmodifyingtheprogram.第10題G04instructionisnon-modalinstruction,withoutrenewfunction.CNCmachiningprogrammingpre-processing第1題WhichofthefollowingsituationsisnotsuitableforNCmachining?AMachiningcontentthatneedstobeadjustedoveralongerperiodoftimeBAsituationinwhichageneralmachinetoolisdifficulttoprocessanditsqualityisdifficulttoguaranteeCOthersporadiclocationthatcannotbeprocessedinoneinstallationDTheoccasionsoflowefficiencyandunstablequalitywithgeneralmachinetools正確答案：AC第2題Cuttingparametersselectionprincipleis:whenroughturning,generally(),andfinallydetermineasuitablecuttingspeed.Afirstchoosethetoolconsumptionaslargeaspossible,andthenchoosethefeedassmallaspossibleBfirstchoosethetoolconsumptionassmallaspossible,andthenchoosethefeedaslargeaspossibleCfirstchoosethetoolconsumptionaslargeaspossible,andthenchoosethefeedaslargeaspossibleDfirstchoosethetoolconsumptionassmallaspossible,andthenchoosethefeedassmallaspossible第3題Forbaseshaftfitting,theprocessingsequenceoffittingholeandshaftshouldbe().AFirstmachiningholes,thenmachiningshaftsBFirstmachiningshafts,thenmachiningholesCMachiningholesandshaftsSimultaneouslyDIndependentsequenceofmachiningholesandshafts第4題Generally,increasingthe()oftheprocesssystemcaneffectivelyreducethevibrationintensity.AStrengthBPrecisionCHardnessDStiffness第5題Shaftsareclampedbetweenthetwotips,limitingfivedegreesoffreedomandbelongingto()positioning.ACompleteBPartialCReduplicateDUncertain第6題Asfaraspossible,the()principleshouldbeadoptedinordertoensurethepositionaccuracyofeachrelativesurfaceofworkpieceandreducethedesignandmanufacturecostoffixture.ASelf-datumBMutualdatumCDatumuniformDDatumsuperposition第7題Amongthecuttingparameters,()hasthegreatestinfluenceonthecuttingtemperature.ACuttingspeedBBackengagementofthecuttingedgeCFeedDFeedingspeed第8題()principlesareoftenusedinmassandquantityproduction.AProcessconcentrationBProcessdispersionCProcessconcentrationandprocessdispersionmixingDfirstfacelasthole第9題CNCmachiningpartswithhighaccuracyismainlydueto().AMultipleclampingsinglestationmachiningBOnceclampingmulti-stationmachiningCMultipleclampingandmulti-stationmachiningDSmallmachinetoolvibration第10題Asfaraspossible,thefinishingprocessshouldselect()asthepositioningreferencetoavoidtheresultingpositioningerror.AProcessdatumBAssemblydatumCDesigndatumDOperationdatumCNCprogrammingtechnology第1題whichiscorrectinthefollowingprogram?()AG00X50Y50；X0Y10；BG00X50Y50；X0Y10R50；CG02G41X50Y50；DG02X50Y50R80；X50Y30；第2題WhichofthefollowingFANUCinstructionsistheoutercircleroughturningcycleinstruction?().AG70BG72CG73DG71第3題Whendrillingaholewithφ5mmdiameteand100mmdepthwithaCNCmachinetool,thedrillingcycleinstructionshallselect().AG81BG83CG84DG76第4題Usingfixedcycleinstructionprogrammingcanbe().ASpeedupcuttingspeedandimprovemachiningqualityBShortenprogramlengthandreduceprogrammemoryCReducethenumberoftoolchangingandimproveprocessingefficiencyDReducethedepthofcutandensurethequalityofprocessing第5題WhichofthefollowinginstructionscanbeusedtothefixedcycleinstructionofaFANUCCNClathe?()AG03BG89CG83DG90第6題ThreadedturninginstructionsG33includethecompletecontroloftoolcutting,threadcutting,cuttingoutandtoolretracting。第7題DuringNCturning,theinstructionformatofsettingspindlespeedtoconstantlinearspeedisG97S。第8題Afterrunningtheinstructionof"G00G90X20Y20;G01G91X-10Y10;",thetoolcoordinatesare().AX-10Y40BX5Y30CX10Y30DX-10Y20第9題Amongthefollowingprogramsegments,whichistheprogramsegmentthatdescribesR20roundmachining?AG03I-20J0F500；BG03X20Y0R20；CG02X20Y0R20；DG03X20Y0R-20；第10題G04instructioncanmakethetoolno-feedingfinishingforshorttime.CNCmachiningsimulation第1題WhentheCNCmachinetoolisturnedon,itisgenerallynecessarytocarryouttheoperationofreturningtothereferencepoint。Whatisthepurpose？()AEstablishingmachinetoolcoordinatesystemBEstablishinglocalcoordinatesystemCEstablishingabsolutecoordinatesystemDEstablishingrelativecoordinatesystem第2題Thetool-alignmentcomponentisusedtodeterminethemutualpositionbetween().AMachinetoolsandfixturesBFixtureandworkpieceCFixtureandtoolsDMachinetoolsandworkpiece第3題ThefunctionkeytodisplayalarmnumberontheoperatingpanelofFAN