外文翻译--二维振动切削的微加工特征 英文版.pdf外文翻译--二维振动切削的微加工特征 英文版.pdf

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INTERNATIONALJOURNALOFTHEKOREANSOCIETYOFPRECISIONENGINEERING,VOL2,NO3,SEPTEMBER200141CHARACTERISTICSOFMICROMACHININGUSINGTWODIMENSIONALTOOLVIBRATIONJUNGHWANAHN1,HANSEOKLIM2ANDSEONGMINSON31SCHOOLOFMECHANICALENGINEERING,PUSANNATIONALUNIVERSITY,BUSAN,SOUTHKOREA2DEPARTMENTOFMECHANICALENGINEERING,NATIONALUNIVERSITYOFSINGAPORE,SINGAPORE,SINGAPORE3DEPARTMENTOFMECHANICALANDINTELLIGENTSYSTEMSENG,PUSANNATIONALUNIVERSITY,BUSAN,SOUTHKOREAABSTRACTTHISPAPERDISCUSSESTHEFEASIBILITYOFIMPROVINGMICROMACHININGACCURACYBYUSINGTWODIMENSIONAL2DVIBRATIONCUTTINGVIBRATIONCUTTINGISGENERATEDBYTWOPIEZOACTUATORSARRANGEDORTHOGONALLYONEISACTUATEDBYASINECURVEVOLTAGEINPUT,ANDTHEOTHERISACTUATEDBYAPHASESHIFTEDSINECURVEVOLTAGEATOOLATTACHEDTOTHEVIBRATOROSCILLATESINA2DELLIPTICALMOTION,DEPENDINGONTHEFREQUENCIES,AMPLITUDES,ANDTHEPHASESHIFTSOFTWOINPUTSIGNALSANDTHEWORKPIECEFEEDRATEALONGTHEELLIPTICALTOOLLOCUS,CUTTINGISDONEINTHELOWERPART,ANDNONCUTTINGISDONEINTHEUPPERPARTBYTHISWAYAUNIQUEFEATUREOF2DVIBRATIONCUTTING,THATIS,AIRLUBRICATIONBETWEENATOOLANDCHIPS,ISCAUSEDANOTHERUNIQUEFEATUREOF2DVIBRATIONCUTTINGWASEXPERIMENTALLYVERIFIED,THATIS,SOMENEGATIVETHRUSTFORCEOCCURSASTHEDIRECTIONOFCHIPMOVEMENTONATOOLRAKEFACEISREVERSEDTHOSEFEATURESNOTONLYHELPCHIPSFLOWSMOOTHLYANDCONTINUOUSLYBUTALSOREDUCECUTTINGFORCE,WHICHRESULTSINAHIGHERQUALITYMACHINEDSURFACETHROUGHTOOLPATHSIMULATIONSANDEXPERIMENTSUNDERSEVERALMICROMACHININGCONDITIONS,THE2DVIBRATIONCUTTING,COMPAREDTOCONVENTIONALCUTTING,WASFOUNDTORESULTINAGREATDECREASEINTHECUTTINGFORCE,AMUCHSMOOTHERSURFACE,ANDMUCHLESSBURRKEYWORDSTWODIMENSIONAL2DVIBRATIONCUTTING,PIEZOACTUATOR,ELLIPTICALLOCUS,MICROMACHINING1INTRODUCTIONHIGHPRECISIONMICROMACHININGTECHNOLOGYFORMANUFACTURINGOPTICSSUCHASNONSPHERICALMIRRORSANDFLATLENSESHASBEENINPROGRESSBECAUSEAUDIO/VIDEOPRODUCTSNEEDTOBECOMPACTANDCOMFORTABLE,COREOPTICALPARTS,SUCHASFRESNELLENSESANDDIFFRACTIONGRATINGS,CONTINUETOBECOMEMOREMINIATURIZEDANDMULTIFUNCTIONEDWHILETHEIRPROFILESBECOMEMORECOMPLICATEDTHISISWHYHIGHPRECISIONMICROMACHININGISBECOMINGMOREIMPORTANTTHANEVERINGENERAL,THESIZEEFFECTINEVITABLEINMICROMACHINING,WHICHMAKESTHESPECIFICCUTTINGFORCELARGE,CAUSESSUCHUNDESIRABLEPROBLEMSASFORMDEFORMATION,CHATTER,ANDBURR,ALLOFWHICHDETERIORATETHEQUALITYOFOPTICALPARTSINTERMSOFBOTHFORMACCURACYANDSURFACEROUGHNESS1MANYSTUDIESHAVEATTEMPTEDTODEVELOPENEWMETHODSTOOVERCOMETHEABOVEMENTIONEDPROBLEMSTHESTUDIESAREONSTIFFSTRUCTURESWITHLOWTHERMALERROROFMACHINETOOLS,MICROFEEDINGMECHANISM,ANDTHEMICROMACHININGPROCESSITSELFVIBRATIONCUTTINGISANATTEMPTTODECREASETHESIZEEFFECTBYTHEUSEOFINTERMITTENTAIRLUBRICATIONBETWEENAVIBRATORYTOOLANDCHIPS2,3,4THISSTUDYAIMSATINVESTIGATINGTHEEFFECTSOFTWODIMENSIONAL2DVIBRATIONCUTTINGONCUTTINGFORCE,SURFACEROUGHNESS,BURRANDSOONATOOLVIBRATORCOMPOSEDOFTWOPIEZOACTUATORSISDEVELOPED,ANDACONTROLPROGRAMTOGENERATEANAPPROPRIATETOOLMOTIONISDEVELOPED2MODELOFTWODIMENSIONALVIBRATIONCUTTINGONEDIMENSIONALVIBRATIONMECHANISM,INWHICHAJUNGHWANAHN,HANSEOKLIMANDSEONGMINSONINTERNATIONALJOURNALOFTHEKSPE,VOL2,NO342HORNISUSEDTOACHIEVEAVIBRATIONOFHIGHFREQUENCYANDQUITELARGEAMPLITUDE,WASPROVEDVERYEFFECTIVEINDECREASINGTHECUTTINGFORCE2INCOMPARISON,2DTOOLVIBRATIONHASTHEADDITIONALADVANTAGEOFBEINGABLETOGENERATEAVARIETYOFTOOLPATHSBYCOMBININGTWOAXISVIBRATORYTOOLMOVEMENTSFIG1SHOWSTHEPRINCIPLEOFTWODIMENSIONALVIBRATIONCUTTINGASSUMINGAMPLITUDEA,FREQUENCYF,PHASESHIFTΦ,ANDWORKPIECEFEEDRATEVINTHE2DVIBRATIONCUTTING,THETOOLLOCUSISEXPRESSEDBYEQUATIONS1THETOOLISENGAGEDINDOWNCUTTINGDURINGPERIODI,WHILEITCUTSTHEWORKPIECEUPWARDDURINGPERIODIITHEREFORE,CUTTINGFORCESAREEXPECTEDTOINCREASEDURINGPERIODIANDDECREASEINPERIODIITHEN,INTHERESTOFACYCLICTOOLLOCUS,THETOOLISNOTINCONTACTWITHTHEWORKPIECEINTHISWAYTHEWHOLECYCLEREPEATSSINSINFTAYVTFTAXΦ1THETHEORETICALMAXIMUMSURFACEROUGHNESSRMAXCANBECALCULATED,DEPENDINGONTHETOOLVIBRATIONPARAMETERSASSUMINGTHATΦISCONSTANT,RMAXISEXPRESSEDASEQUATION22,1,1MAX⎟⎟⎠⎞⎜⎜⎝⎛∝VFAFRPHASESHIFTΦ,WHICHAFFECTSTHETOOLLOCUSPATTERN,SHOULDBESELECTEDINORDERTOOBTAINANAPPROPRIATETOOLLOCUSONCETHEDEPTHOFCUTANDTHEFEEDRATEAREGIVENTHEORETICALLY,THELARGERTHEAMPLITUDE,THEHIGHERTHEFREQUENCY,ANDTHESLOWERTHEFEEDRATE,THEMACHINEDSURFACEBECOMESSMOOTHERINREALITY,HOWEVER,BECAUSETOOSLOWAFEEDRATELOWERSTHECUTTINGEFFICIENCYANDAVIBRATIONMECHANISMHASITSOWNLIMITEDDYNAMICCHARACTERISTICS,SUCHPARAMETERSASAMPLITUDE,FREQUENCY,ANDFEEDRATEMUSTBEDECIDEDAPPROPRIATELYCONSIDERINGTHOSEFACTORS3PIEZODRIVEN2DVIBRATINGTOOLSUPPORTFIG2SHOWSTHESTRUCTUREOFAPIEZODRIVEN2DVIBRATINGTOOLSUPPORTANDITSACTUATIONSIGNALGENERATINGSYSTEMTWOPZTACTUATORSARELOCATEDPERPENDICULARLYTOEACHOTHERINAMETALPLATE,WHICHISSHAPEDFORTHETOOLHOLDERTOBEELASTICALLYDEFORMEDINTHEXANDYDIRECTIONSBYTHEPZTACTUATINGFORCESINORDERTOREMOVETHECROSSINTERFERENCEOFEACHAXISDISPLACEMENT,CROSSSHAPEDVOIDSAREDEVISEDINTHETOOLHOLDERIFASINEWAVEGENERATEDFROMAFUNCTIONGENERATORISINPUTTEDTOATWOPHASESIGNALGENERATOR,TWOSINEWAVESWITHAPHASESHIFTΦ,CORRESPONDINGTOAREQUIREDTOOLPATTERNAREOUTPUTTEDUSINGATWOCHANNELSIGNALAMPLIFIER,THETWOPHASESIGNALSAREAMPLIFIEDENOUGHTOACTUATETHEFIG1PRINCIPLEOF2DVIBRATIONCUTTINGFIG2PIEZODRIVEN2DVIBRATINGTOOLSUPPORTASTRUC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