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外文翻译--一个激光束加工(LBM方法)数据库的切割瓷砖 英文版.pdf

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外文翻译--一个激光束加工(LBM方法)数据库的切割瓷砖 英文版.pdf

JOURNALOFMATERIALSPROCESSINGTECHNOLOGY84199847–55ALASERBEAMMACHININGLBMDATABASEFORTHECUTTINGOFCERAMICTILEIBLACK,SAJLIVINGSTONE,KLCHUADEPARTMENTOFMECHANICALANDCHEMICALENGINEERING,HERIOTWATTUNI6ERSITY,RICCARTON,EDINBURGHEH144AS,UKRECEIVED13DECEMBER1997ABSTRACTTHISPAPERCOVERSTHECUTTINGOFCOMMERCIALLYAVAILABLECERAMICTILESUSINGACO2LASERCUTTINGMACHINE,WITHTHEOBJECTOFPRODUCINGALASERBEAMMACHININGLBMDATABASETHATCONTAINSTHEESSENTIALPARAMETERINFORMATIONFORTHEIRSUCCESSFULPROCESSINGVARIOUSLASERCUTTINGPARAMETERSWEREINVESTIGATEDTHATWOULDGENERATEACUTINCERAMICTILEWHICHREQUIREDMINIMALPOSTTREATMENTTHEEFFECTSOFVARIOUSSHIELDGASES,OFMULTIPASSCUTTINGANDOFUNDERWATERCUTTINGWEREALSOEXAMINED1998ELSEVIERSCIENCESAALLRIGHTSRESERVEDKEYWORDSCO2;LASERCUTTING;CERAMICMATERIALS;ADVANCEDMANUFACTURINGPROCESSES1INTRODUCTIONANDBACKGROUNDMANUALMETHODSOFCUTTINGCERAMICTILESAREVERYSIMILARTOTHATFORGLASS,IESCRIBINGTHEMATERIALSWITHTUNGSTENCARBIDETIPPEDCUTTER,FOLLOWEDBYTHEAPPLICATIONOFABENDINGMOMENTALONGTHESCRIBEDLINETOINITIATECONTROLLEDFRACTUREHOWEVER,MANUALTECHNIQUESARELIMITEDTOSTRAIGHTLINECUTTINGANDRELATIVELYLARGERADIUSCUTSINTERNALANDUNDERCUTPROFILESARENEARLYIMPOSSIBLETOPRODUCEWITHSCORINGALONEWITHTHEPOSSIBLEEXCEPTIONOFINTERNALCIRCLES;MORESOPHISTICATEDMETHODSHAVINGTOBEAPPLIEDTOACHIEVETHESEPROFILESTRADITIONALLY,DIAMONDSAW,HYDRODYNAMICWATERJETORULTRASONICMACHININGAREUSEDTOCREATECOMPLEXGEOMETRIESINCERAMICTILES,BUTTHESEPROCESSESAREVERYTIMECONSUMINGANDEXPENSIVEFOREXAMPLE,TYPICALDIAMONDSAWCUTTINGSPEEDSAREINTHEORDEROF20MMMIN11,WHILEULTRASONICDRILLINGOFAL2O3TAKESOVER30SPERHOLE2THEMOSTCRITICALFACTORARISINGFROMUSEOFACO2LASERTOCUTCERAMICTILESISCRACKDAMAGE,WHICHISESSENTIALLYCAUSEDBYAHIGHTEMPERATUREGRADIENTWITHINTHECERAMICSUBSTRATEDURINGTHECUTTINGPROCESSTHESECRACKSREDUCETHESTRENGTHANDARESOURCESFORCRITICALCRACKGROWTH,WHICHMAYRESULTINPARTIALORCOMPLETEFAILUREOFTHETILESUBSTRATE3THUSAREDUCTIONOFPROCESSINDUCEDCRACKFORMATIONISPARAMOUNTFORTHEREALISTICCOMMERCIALUSEOFLASERSTOCUTCERAMICTILES2LASERCUTTINGPARAMETERSLASERMACHININGOFANYMATERIALISACOMPLEXPROCESSINVOLVINGMANYDIFFERENTPARAMETERSTHATWHICHALLNEEDTOWORKINCONSORTTOPRODUCEAQUALITYMACHININGOPERATION4,PARAMETERSSUCHASILASERPOWERINPUT;IIFOCALSETTING;IIIASSISTGASTYPEANDPRESSURE;IVNOZZLECONFIGURATION;VWORKPIECETHICKNESS;ANDVIOPTOPHYSICALPROPERTIESPREVIOUSRESEARCHWITHINTHEAUTHORS’DEPARTMENT1,5,6HASALSODEMONSTRATEDTHECRITICALITYOFTHEABOVEPARAMETERSINEFFICIENTLASERCUTTING21LASERPOWERLASERPOWERDEPENDSONTHETYPEOFLASERUSEDFORTHEWORKREPORTEDINTHISPAPER,AFERRANTIMF400CNCLASERCUTTERWASEMPLOYED,RATEDATAPOWEROUTPUTOF400WHOWEVER,DUETOUPGRADING,THEMAXIMUMBEAMPOWERACHIEVABLEWASBETWEEN520ANDCORRESPONDINGAUTHORFAX441314513129;EMAILIBLACKHWACUK0924013698SEEFRONTMATTER1998ELSEVIERSCIENCESAALLRIGHTSRESERVEDPIIS0924013698000788IBLACKETALJOURNALOFMATERIALSPROCESSINGTECHNOLOGY84199847–5548530WINCONTINUOUSWAVECWCUTTINGMODETHELASERALSOHADTHEABILITYTOWORKINPULSEMODEPMANDSUPERPULSEMODESPM;FIG1TODETERMINETHEEQUIVALENTPOWEROUTPUTDURINGPULSINGOPERATION,APOWERVERSESPULSINGCHARTWASUSEDINCONJUNCTIONWITHTHEFOLLOWINGBASICEQUATION9PRPLPSF1PLPRALTHOUGHTHELASERCUTTERCOULDOPERATEBETWEENFREQUENCIESOF50AND5000HZ,AVALUEOF500HZWASRECOMMENDEDINPREVIOUSWORK1,5SINCETHISSETTINGPROVEDTOBESUCCESSFUL,ONLYLIMITEDINVESTIGATIONINTOOTHERFREQUENCIESWASCARRIEDOUTAT250HZ,750AND100HZ22CUTTINGSPEEDTHECNCTABLEUSEDWITHTHEFERRANTIMF400LASERCUTTERHADAMAXIMUMFEEDRATEOF10000MMMIN1PREVIOUSWORK6INDICATEDTHATFEEDRATESABOVE6000MMMIN1PROVEDTOBEUNSTABLEFORANYSTANDARDISEDTESTINGTHEOPTIMUMCUTTINGSPEEDVARIEDWITHTHEPOWERSETTINGAND,MOREIMPORTANTLY,WITHTHETHICKNESSOFTHEWORKPIECE23SHIELDGASTYPEANDPRESSURECOMPRESSEDAIR,ARGON,NITROGENANDOXYGENWEREUSEDASSHIELDGASESDURINGCUTTING,WITHPMAX4BARDIFFERENTSHIELDGASESWEREUSEDTOEXAMINEDTHEIREFFECTONCUTQUALITYAFTERPROCESSING,SINCETHESHIELDGASNOTONLYCOOLSANDCUTEDGESANDREMOVESMOLTENMATERIAL,BUTALSOGENERATESACHEMICALREACTIONWITHTHESUBSTRATEMATERIAL7THERESULTSOFTHISCHEMICALREACTIONDIFFERFOREACHTYPEOFSHIELDGASUSEDFORTESTPURPOSESPWASVARIEDINSTEPSOF05BARFROM1TO25BAR,THENINSTEPSOF02BARFROM26BARTOTHEMAXIMUMATTAINABLEGASPRESSURE24NOZZLECONFIGURATIONTHENOZZLEDIAMETERCONTRIBUTESDIRECTLYTOTHEMAXIMUMACHIEVABLEGASPRESSUREANDHENCETOTHEMASSFLOWRATEOFTHEGASWASIMPORTANTFORTHEECONOMICSOFCUTTING,ESPECIALLYWHENUSINGCYLINDERSOFARGONANDNITROGENONLYCIRCULARPROFILESFORTHENOZZLEEXITSWEREAVAILABLE06MM5NS520MM,BUTTHISUNIFORMNOZZLEEXITGEOMETRYALLOWEDCUTTINGINANYDIRECTION25NOZZLEHEIGHTANDFOCALPOSITIONINGTHEHEIGHTATWHICHTHENOZZLEWASSETWASGOVERNEDBYTHEPOSITIONOFTHEFOCALPOINTTHEFERRANTIMF400LASERCUTTERONLYPOSSESSEDALONGFOCALLENGTHOF110FIG1CUTTINGMODESMMORIGINALLYASHORTFOCALLENGTHOF46MMWASAVAILABLEBEFOREUPGRADINGANDTHISLENGTHCOULDBEALTEREDBY95MMIFTHENOZZLEHEIGHTWASINCORRECTLYSETTHEBEAMWOULD‘CLIP’THENOZZLEANDREDUCETHEEQUIVALENTPOWEROUTPUTTOTHEWORKPIECE6FORTHEBULKOFTHETESTINGTHEFOCALHEIGHTWASSETSOTHEFOCALPOINTWAS‘ONTHEJOB’,IEONTHETOPSURFACEOFTHEWORKPIECETHISCONDITIONOBVIOUSLYGOVERNEDTHEPOSITIONOFTHENOZZLEABOVETHEWORKPIECE3EXPERIMENTALPROCEDURESIXTYPESOFSIAL2O3BASEDCERAMICTILESWEREEXAMINEDTABLE1,ORIGIN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

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