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外文翻译--在精镗中提供稳定高频振动的摩擦阻尼器 英文版.pdf

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外文翻译--在精镗中提供稳定高频振动的摩擦阻尼器 英文版.pdf

StabilizationofhighfrequencychattervibrationinfneboringbyfrictiondamperEvitadhi,TetsutaroHoshiAbstracFritondamperhasbeenfoundsuccesfultopreventhighfrequencychateroccurringatmorethan10,000Hz,andcusingproblmofrducdtoollinineboringopeation.Thenewdamperischarteridbysimplestructurethaconsistofadditionalmstcdtohemainvibratingstucturewithmalpicofpermanentmgnet.TheprincpleisstrightforrdinwhichCoulombndvisousfitonsdisipatevibrationenergyatheinteacbetethedamperaminbratingstructure.Thedamperdsnotuning,andisftiveathighfrequency.Thepaperfistntoducsatypicaldesignofthefrictondamperwithexpeimntalproofbycuttingteofiteftiveneinelimnatingthehighfequencychatrinfneboring,andsurinormaltoollieofthecuttidge.Toreticalandxperimentalnalysesrintroducedforunderstndingtfundamentalprincplndchartistcofthenewdampe.Thenewdampeiefctiveorboringtools,whichvibrateatfequencymorethan5,000Hz.KywordsKKKHighfrequencychaterFictondamperFineboring.1.IntuctoApreviousstudyreportdfineboringtoolsexhibitingchaterathighfrequency,morethan10,000Hz.Thefquencywasirtdentifdromthetmkltonthesurfac,thefurtherconfirmedincuttingtebydirectmasuremntusingthelaserdisplacemntmetr.Thatwasfoundatributabltobendingnaturalvibrationoftboringtool,slfxcitedbycuttingprocesdynamicsthaincludetheregenertiveefct,heimaginarypartctofinnermodulation,andXYLooping.Prventionofsuchhatrvibrtionsthetagetthepresnttudy.Efectivehatrpreventionduringcuttingoperationsmaybeachievedbyincreasingthedampingapaityofcuttingtoolsystem.Dampicpaitsgenerthroughimcolipatcertinnterfsincludedintheoolsystem,islipathegrainboundarywithina1vibratingbodybymaterildampinginternalfricton,ifrictonatninterfacbetwentheminvitindthemperstuctur.Studiesonvaiouskindofdampetoprventchaterbration,atoimprovetabilityofboringtoolorothercuttingoperationhabeenaidoutbymnyresarches.Prctialtypeofdampehavebeenconventionalyeitherdynamicorimpactdamper.Dynamidamperconsistofadditionalspringmasubsystm,andneedstuningofnaturalfrequencyofthesubystemtomchthaofthemintructure.Thedynamicdamperisusualdesignedtoincludenergydisipatonbyeitslidingorinternalfritonofthespringmateril.Impactdampeconsitofoneormoffremovibodies,andtincplmchanismistodisipatenergybytheimpactmngbodywithhemainstructure.Impatdampernedscrtainvelocityoeftivelyfunction,thuscannotbeppliedtoupprsvibrationtlowfrequency.Ahybriddesignofdynamicandimpatdampershasbeenrportedrcntly,andoundtobeefctivetouppresthelowfrequencyvibration.Itheprstudy,thedamperisrquirdtbefctiveatishighs10,000Hz,andithouldbedesignedwithinsizelimtaionoftheboringtooltoacommdatespaceforsetingtheoolinsert,chippocketandthedamperitself.Itisalprefrblthathedampernedsnotuning.Thedamperproposedintprenttudyconsitofapiceofmasatchedtohemainstructurebymanentmagnet.Tobjectiveoftheprsnttudyistonalyzethefectivenesandcharateristcoftheproposddamperineveingchatervibrationthaocurthighfrequency.oachievetheobjcti,uttitshavebeenconductedinboringoperationanaloguestonehavinghighfrequencyctrproblmitheplant,swelstheoreticalndexperimentalnalysesofnegydisipatonoftheoposeddamper.2.BongtostdantheproedaprstuceTheboringtoolunderstudythaoriginalyhaproblemofhighfrquencychaterconsitofa13mmdiametand20mmlongcantilevrdstlbarintegralwithabasflange.Amaldimetrhol,5.5mm,isprepardthendofthetoacommdatthedampermsofwhichdiametrmaybe5mmorls.Tpositontholeislectdinradilorientationom1,becusthehighfrequencyvibratiduetoXYloopinghasbeknowntooccurdominantlyintorientationom2asdepictedWhentoolisrotatedinboringoperation,thedamperispushedtohewloftheholbytcentifugalforc,butisfretomoveintorientationoftvibrationom2.Acapisprovidedtoprotethedampeomchipsremovedduringtheopertion.Thefctivenesoftdampehasbeentsedfortheoolashownithefigure,as2welasotherboringtoolsthavebeenprparedforcomparison.Oneoftcompariontoolshathesamdiamtr13mm,butextnded10mmbeyondthecuttingedge,andgeneratectervibrtiontbout5,000Hz.Othercomparisonsare16mmdiamtrcntilevetypeboringtools,deignedwithgreatrlengthLtodimtDratiosthaexhibithatratlowerfquencie.Bsictructureofthenewictondamperisthecombinationofamsandpermanentmagnet,whihanchorstmastohemaintuctureonafltsurfceparletohediectionofvibration.Themgnetmybeeitrintegralorspartdwithhemas.Athirdmmber,aspacer,mybeinsertdtwnthepemnemgnetandtmintructurewhosepurposeitoontolmagnitudeofmagneticforce.Efctivenesofthefrictondampersinsuppresinghighfrequencyhatersbenvaluated.3.MthodxpinTvalidatehefectivenesofthedamperinviewofcontrollingthechater,andtoasurenormaltoolwarndurfaceroughnesgeneratd,uttitesvebenpeformedwithhe13mmdimetboringtoolotateditinproductionit.Inthiscae,theboringtoolismountedonthemainspindleofhorizontalmchiningcentrviatingadwhosefunctiontoadjustrdilpositontheooltipforautomtiontoloftheholediametrinproduction.Ringtypeworkpiecshavebeenprparedwhoseinnersurfaceistobemachinedbytherotatiboritool.RingsarmdeofSCM420Haloytel,hardenedt313to332Brinnelhadnesith25mmoutedimter,14.72±0.05mminnerdiamt,and15mmlength.Amilngchuckclampstheringonaspecialydesignedfixturewithsufficentstifnes.Thestndardonditiforcuttingtesieto130m/mincuttingped,0.03mm/revfedrate,0.14mmdepthof,andusinocuttingfluid.Anetiedgeisprpadforchstofcuttingtesinwhichorkpiesareontinuouslymachid.Thecuttingtesirepeatdwieforachboringtoolsystmwithndithoutthedamper.oolinsrtmarilusfortheboringtoolisTCermtnoncoated,ithaxilrakengle5°,radilkengle15°,andnoseradius0.4mm.Formsuringvibrationofthe16mmdiametrtool,anothersetupwasprepardwithhetoolheldtaionary,ndusedtomachineoutsurfceoftotatingriorkpic.Inthissetup,toolisclampebymilnghucktagedonabasepltonthemachinetableofverticalmhiningentr.Theriworkpiecismountendrotatedbytmspindl.34.Analysiofrictondamperchanism4.1TheoreticalnalysisDuringthedevelopmentofchater,oncethevibrationreachesertainthresholdamplitude,tdamperwilstarliding,trforintroducingfitontheintrfacebetwenthedampermasndthemintucture.Theictondisipateshevibratienegy,ndpreventthechaterfomgrowingbeyondthreholdamplitude.4.2ExperimentalnalysisInordetoscertainvalidityofthewotheoreticalmodelsasumingCoulombandviscousfrictonpetively,vibrationaminstructuremlhabeenmonitoredwithawithoutthedamrmastched,ndexcitdextnalybyanelctrodynamicxcitr.cantileverdstelbem16mmdiamtr,havingsimlarcuttingdgedesignithheoriginalboringtooland170mmlength,hasbeenusdtheminstructurewhosecondderbendimodewsxcitdaround5,700Hzfrequency.Thevibrationthendofthebeamisdetecdbymicroizecleomtrpickup.Adamperwithnintegralmgnetistcdontopofthemainstucturvialnedanddriedntfaceslsoildinterfac.Rndomexcitaonisfrtpplietoideiythenaturalfrequencyoftheminstructure.ThensinusoidalitiaidatvariablemplitudeoftheinputdynamicforcFatfrequencyZfinelytunedroundthenaturlfquencyidentifedbyrandomexcitaon.Athesamtim,amplitudexofesponsevibrationXofthemainstructur,ndthephasedifrencbetweninputdynamicforcandrsponsevibration,remedbytFTnalyz.AmountofenergysuppliedEpeticyclbythesinusoidalexcitaoniscomputedfromthemaurf,asollowsvibrationmplitudexofthemainstructureisrducedwhentdamperisatchedoneitherdriedoroiledintrface.Wthedamperiusd,tamplitudexexhibitstgnantstpduringthexcitonorincremntfom0.3to0.6N.5.ConclusioTontrolchatervibrationoccuringatfrequenciesahighas10,000Hz,aspreviouslyreportdinfneboringopertion,performncofanewdampermechanimutilngfrictonbetwadampermasndthemainvibratingstructurehasbenvaluatedbyctiandexcitonexpeiment.Thenedamperconsistofapiecofmastachedtohemainstructurebypermanent

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