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外文翻译--数控车削中心工件误差实时预报【优秀】.doc

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外文翻译--数控车削中心工件误差实时预报【优秀】.doc

毕业设计论文外文资料翻译系别机电信息系专业机械设计制造及其自动化班级姓名学号外文出处INTJADVMANUFTECHNOL附件1原文;2译文2013年01月INTJADVMANUFTECHNOL200117649–6532001SPRINGERVERLAGLONDONLIMITEDREALTIMEPREDICTIONOFWORKPIECEERRORSFORACNCTURNINGCENTRE,PART1MEASUREMENTANDIDENTIFICATIONXLIDEPARTMENTOFMANUFACTURINGENGINEERING,CITYUNIVERSITYOFHONGKONG,HONGKONGTHISPAPERANALYSESTHEERRORSOURCESOFTHEWORKPIECEINBARTURNING,WHICHMAINLYDERIVEFROMTHEGEOMETRICERROROFMACHINETOOLS,IETHETHERMALLYINDUCEDERROR,THEERRORARISINGFROMMACHINE–WORKPIECE–TOOLSYSTEMDEFLECTIONINDUCEDBYTHECUTTINGFORCESASIMPLEANDLOWCOSTCOMPACTMEASURINGSYSTEMCOMBININGAFINETOUCHSENSORANDQSETTEROFMACHINETOOLSFTSFQISDEVELOPED,ANDAPPLIEDTOMEASURETHEWORKPIECEDIMENSIONSANIDENTIFICATIONMETHODFORWORKPIECEERRORSISALSOPRESENTEDTHEWORKPIECEERRORSWHICHARECOMPOSEDOFTHEGEOMETRICERROR,THERMALERROR,ANDCUTTINGFORCEERRORCANBEIDENTIFIEDACCORDINGTOTHEMEASUREMENTRESULTSOFEACHSTEPTHEMODELOFTHEGEOMETRICERROROFATWOAXISCNCTURNINGCENTREISESTABLISHEDRAPIDLYBASEDONTHEMEASUREMENTRESULTSBYUSINGANFTSFQSETTERANDCOORDINATEMEASURINGMACHINECMMEXPERIMENTALRESULTSSHOWTHATTHEGEOMETRICERRORCANBECOMPENSATEDBYMODIFIEDNCCOMMANDSINBARTURNINGKEYWORDSDIMENSIONMEASURE;ERRORIDENTIFICATION;GEOMETRICERROR;TURNING1INTRODUCTIONINRECENTYEARS,ULTRAPRECISIONMACHININGHASMADEREMARKABLEPROGRESSSOMESPECIALLATHESHAVEBEENABLETOMAKEULTRAPRECISIONMACHINING,TOLESSTHANASUBMICRONANDNANOMICRONTOLERANCESAPOSSIBILITYACOMMONSECONDAPPROACHISTHATTHEGRINDINGISUSEDTOACHIEVEAHIGHLEVELOFDIMENSIONALACCURACYAFTERTURNINGHOWEVER,THECONDITIONOFTHECUTTINGTOOLDIAMONDANDWORKPIECEALUMINIUMHAVERESTRICTEDTHEAPPLICATIONOFULTRAPRECISIONLATHESTHESECONDAPPROACHINCREASESTHENUMBEROFMACHINETOOLSANDMACHININGPROCESSESUSED1,WHICHRESULTSINANINCREASEINTHEMANUFACTURINGCOSTATPRESENT,MOSTCNCLATHESAREEQUIPPEDWITHAPOSITIONINGRESOLUTIONOF1URMVARIOUSMACHININGERRORSINFINISHTURNING,HOWEVER,DEGRADETHEACCURACYTOALEVELOFAPPROXIMATELY10URM,SOTHATWHENTURNINGCARBONSTEEL,AMACHININGERRORPREDICTABLYARISESINEXCESSOF20–30URMFORIMPROVINGMACHININGACCURACY,THEMETHODOFCAREFULDESIGNANDMANUFACTUREHASBEENEXTENSIVELYUSEDINSOMECNCLATHESHOWEVER,THEMANUFACTURINGCOSTBASEDONTHEABOVEMETHODWILLRAPIDLYINCREASEWHENTHEACCURACYREQUIREMENTSOFTHEMACHINETOOLSYSTEMAREINCREASEDBEYONDACERTAINLEVELFORFURTHERIMPROVINGMACHINEACCURACYCOSTEFFECTIVELY,REALTIMEERRORPREDICTIONANDCOMPENSATIONBASEDONSENSING,MODELLINGANDCONTROLTECHNIQUESHAVEBEENWIDELYSTUDIED2,SOULTRAPRECISIONANDFINISHTUNINGCANBEPERFORMEDONONECNCLATHETHEPOSITIONINGRESOLUTIONOFTHECUTTINGTOOLSANDWORKPIECEISREDUCEDSOTHATITCANNOTMAINTAINHIGHACCURACYDURINGMACHININGBECAUSEOFTHECUTTINGFORCEINDUCEDDEFLECTIONOFTHEMACHINE–WORKPIECE–TOOLSYSTEM,ANDTHETHERMALLYINDUCEDERROR,ETCINGENERAL,APOSITIONINGDEVICEUSINGAPIEZOELETRICACTUATORISUSEDTOIMPROVETHEWORKINGACCURACY,BUTTHEMETHODINTRODUCESSOMEPROBLEMS,SUCHAS,THEFEEDBACKSTRATEGY,ANDTHEACCURACYOFSENSORS,WHICHADDTOTHEMANUFACTURINGCOSTOFTHEPRODUCTSHOWEVER,IFTHEWORKPIECEERRORCANBEMEASUREDBYUSINGAMEASURINGINSTRUMENT,ORPREDICTEDBYUSINGAMODELLING,THETURNINGPROGRAMPRODUCEDBYMODIFIEDNCCOMMANDSCANBEEXECUTEDSATISFACTORILYONACNCMACHINETOOLTHUS,ACNCTURNINGCENTRECANCOMPENSATEFORTHENORMALMACHININGERROR,IETHEMACHINETOOLCANMACHINEAPRODUCTWITHAHIGHLEVELOFACCURACYUSINGMODIFIEDNCCOMMANDS,INREALTIMETHEWORKPIECEERRORDERIVESFROMTHEERRORINTHERELATIVEMOVEMENTBETWEENTHECUTTINGTOOLANDTHEIDEALWORKPIECEFORATWOAXISTURNINGCENTRE,THISRELATIVEERRORVARIESASTHECONDITIONOFTHECUTTINGPROGRESSES,EGTHETHERMALDEFLECTIONOFTHEMACHINETOOLISTIMEVARIANT,WHICHRESULTSINDIFFERENTTHERMALERRORSACCORDINGTOTHEVARIOUSCHARACTERSOFTHEERRORSOURCESOFTHEWORKPIECE,THEWORKPIECEERRORSCANBECLASSIFIEDASGEOMETRICERROR,THERMALLYINDUCEDERROR,ANDCUTTINGFORCEINDUCEDERRORTHEMAINAFFECTINGFACTORSINCLUDETHEPOSITIONERRORSOFTHECOMPONENTSOFTHEMACHINETOOLANDTHEANGULARERRORSOFTHEMACHINESTRUCTURE,IETHEGEOMETRICERRORTHETHERMALLYINDUCEDERRORSOFTHEMACHINETOOLIETHETHERMALERROR,ANDTHEDEFLECTIONOFTHEMACHININGSYSTEMINCLUDINGTHEMACHINETOOLS,WORKPIECE,ANDCUTTINGTOOLSARISINGFROMCUTTINGFORCES,ARECALLEDTHECUTTINGFORCEERRORTHISPAPERANALYSESTHEWORKPIECEERRORSOURCESINTURNINGTHEERRORSOFAMACHINEDWORKPIECEAREMAINLYCOMPOSEDOFTHEGEOMETRICERROROFTHEMACHINETOOLS,THETHERMALLYINDUCEDERROR,ANDTHEERRORARISINGFROMMACHINE–WORKPIECE–TOOLSYSTEMDEFLECTIONINDUCEDBYTHECUTTINGFORCESASIMPLEANDLOWCOSTMEASURINGINSTRUMENTFORTHEWORKPIECEDIMENSIONS,WHICHCOMBINESAFINETOUCHSENSORANDMACHINETOOLQSETTERFTSFQ,ISDESCRIBED,ANDAPPLIEDTOMEASURETHEWORKPIECEERRORANEWMETHODFORIDENTIFYINGTHEGEOMETRICERROR,THETHERMALERROR,ANDTHECUTTINGFORCEERRORISALSOPRESENTEDFORATWOAXISTURNINGCENTREFINALLY,THEMODELLINGOFTHEGEOMETRICERROROFACNCTURNINGCENTREISPRESENTED,BASEDONTHEMEASUREMENTRESULTSUSINGTHEFTSFQANDCMMTHEGEOMETRICERRORCANBECOMPENSATEDBYTHEMODIFIEDNCCOMMANDMETHOD2ERRORSOURCESINTURNINGTHEMACHINETOOLSYSTEMISCOMPOSEDOFTHEDRIVESERVO,THEMACHINETOOLSTRUCTURE,THEWORKPIECEANDTHECUTTINGPROCESSTHEMAJORERRORSOURCESDERIVEFROMTHEMACHINETOOLTHERMALERRORS,GEOMETRICERRORS,ANDFORCEDVIBRATIONS,THECONTROLDRIVESERVODYNAMICSANDPROGRAMMINGERRORSANDTHECUTTINGPROCESSMACHINETOOLANDCUTTINGTOOLDEFLECTION,WORKPIECEDEFLECTION,TOOLWEAR,ANDCHATTER3ERRORSDERIVEDFROMTHEMACHINETOOLINCLUDETHERMALERRORSMACHINETHERMALERRORANDWORKPIECETHERMALERRORS,GEOMETRICERRORS,ANDFORCEDVIBRATIONS,WHICHDOMINATEMACHININGACCURACYTHETHERMALERRORSANDGEOMETRICERRORSARETHEDOMINANTFACTORSWITHRESPECTTOMACHININGACCURACYINFINECUTTINGHOWEVER,MACHINETOOLERRORSCANBEDECOUPLEDFROMTHEOTHERERRORSOURCESANDCOMPENSATED4THEERRORDERIVEDFROMFORCEDVIBRATIONCANBEREDUCEDTHROUGHBALANCEDDYNAMICCOMPONENTSANDVIBRATIONISOLATION3THEERRORSDERIVEDFROMTHECONTROLLER/DRIVEDYNAMICSARERELATEDTOTHECUTTINGFORCEDISTURBANCESANDTHEINERTIAOFTHEDRIVEANDTHEMACHINETABLETHESEERRORSCANBEREDUCEDBYANINTERPOLATORWITHADECELERATIONFUNCTION5ORBYANADVANCEDFEEDDRIVECONTROLLER6,THESEERRORS,REDUCEDBYUSINGTHEABOVEMETHODS,ARESMALLWHENCOMPAREDWITHOTHERERRORSOURCESOWINGTOTHEDEMANDFORHIGHPRODUCTIVITY,HIGHFEEDRATESANDLARGEDEPTHSOFCUTAREREQUIRED,WHICHRESULTINLARGECUTTINGFORCESTHEREFORE,THECUTTINGFORCEINDUCEDDEFLECTIONSOFTHEMACHINETOOLSPINDLE,TOOLHOLDER,WORKPIECE,ANDCUTTINGTOOLMAKESIGNIFICANTCONTRIBUTIONSTOMACHININGACCURACYDURINGTHECUTTINGPROCESSINADDITION,TOOLWEARANDMACHINETOOLCHATTERAREALSOIMPORTANTERRORSOURCESINTHECUTTINGPROCESSHOWEVER,THESEEFFECTSARENEGLECTEDHERESOASTOFOCUSONTHEMAINERRORSOURCESINSHORT,THEERROROFAMACHINEDWORKPIECE,IETHETOTALMACHININGERRORITOT,ISCOMPOSEDMAINLYOFTHEGEOMETRICERRORSOFTHEMACHINETOOLSIG,THETHERMALLYINDUCEDERRORIT,ANDTHEERRORIFARISINGFROMTHEDEFLECTIONOFTHEMACHINE–WORKPIECE–TOOLSYSTEMINDUCEDBYTHECUTTINGFORCESHENCE,ITOTIGITIF1INTHENEXTSECTION,WEPRESENTANOVELCOMPACTMEASURINGINSTRUMENTANDANEWANALYTICALAPPROACHFORMEASURINGANDIDENTIFYINGWORKPIECEERRORSINTURNING3ACOMPACTMEASUREMENTSYSTEMCONTACTSENSORS,SUCHASTOUCHTRIGGERPROBES,HAVEBEENUSEDTOMEASUREWORKPIECEDIMENSIONSINMACHININGINMACHININGPRACTICE,THEMEASURINGINSTRUMENTISATTACHEDTOONEOFTHEMACHINE’SAXESTOMEASUREASURFACEONTHEWORKPIECEATP7MORMP3ASSOCIATEDWITHTHEPH10MRANGEOFMOTORISEDPROBEHEADSORAPH6MFIXEDHEADHAVEBEENUSEDWIDELYINTHEAUTOMATEDCNCINSPECTIONENVIRONMENTOWINGTOTHEIRHIGHLEVELOFRELIABILITYANDACCURACYANDINTEGRALAUTOJOINTTHOUGHTHEPROBEHEADSAREOFADEQUATEACCURACYUNIDIRECTIONALREPEATABILITYATSTYLUSTIPHIGHSENSITIVITY025URM;PRETRAVELVARIATION360HIGHSENSITIVITY025URM,ANDVERSATILEINAPPLICATION,THEYHAVECLEARDRAWBACKS,INCLUDINGCOMPLEXITYOFCONSTRUCTION,HIGHPRICE4988,ANDTHENEEDFORCAREFULMAINTENANCETOOVERCOMETHESEDRAWBACKSOFTOUCHTRIGGERPROBES,OSTAFIEVETAL7PRESENTEDANOVELTECHNIQUEOFCONTACTPROBINGFORDESIGNINGAFINETOUCHSENSORTHECUTTINGTOOLITSELFISUSEDASACONTACTPROBETHESENSORISCAPABLEOFYIELDINGMEASUREMENTACCURACYCOMPARABLETOTHATOFTHEBESTTOUCHTRIGGERPROBEINUSEMOREOVER,THEPRINCIPLEOFOPERATIONANDCONSTRUCTIONOFTHESENSORISEXTREMELYSIMPLE,THECOSTOFTHESENSORISLOW,ANDTHEMAINTENANCEISVERYEASYINTHISPAPER,THISSENSORWILLBEUSEDTOMEASURETHEDIAMETEROFAWORKPIECEASSOCIATEDWITHTHEQSETTERATOUCHSENSORISMOUNTEDONACNCTURNINGCENTREWHENWEMANUALLYBRINGTHETOOLNOSEINTOCONTACTWITHIT,ANINTERRUPTSIGNALISGENERATEDFORTHENCUNITTOSTOPANAXISMOREOVER,ITCANWRITEINANOFFSETANDAWORKPIECECOORDINATESHIFTAUTOMATICALLYTHISFUNCTIONFACILITATESSETUPWHENREPLACINGATOOL,ANDTHISCONVENIENTFUNCTIONISCALLEDTHE“QUICKTOOLSETTER”OR“QSETTER”BASEDONTHEABOVEPRINCIPLE,WECANOPERATEASWITCH,WHICHISCONTROLLEDBYFINETOUCHSENSOR,BETWEENTHEQSETTERANDNCUNITWHENTHETOOLTIPTOUCHESTHEWORKPIECESURFACE,THEFINETOUCHSENSORCANSENDACONTROLSIGNALTOTHESWITCH,TOTURNITTOTHE“OFF”STATESEEFIG1,THEFINETOUCHSENSORREPLACESTHEQSETTERFUNCTION,TOSTOPANAXISANDWRITEINANOFFSETANDAWORKPIECECOORDINATESHIFTAUTOMATICALLYTHEREFORE,THEFINETOUCHSENSORASSOCIATEDWITHFIG1FLOWDIAGRAMOFAFINETOUCHSENSORFIXEDONACNCCONTROLLER

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