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英语翻译OPTIONSFORMICROHOLEMAKINGASINTHEMACROSCALEMACHININGWORLD,HOLEMAKINGISONEOFTHEMOSTIFNOTTHEMOSTFREQUENTLYPERFORMEDOPERATIONSFORMICROMACHININGMANYOPTIONSEXISTFORHOWTHOSEHOLESARECREATEDEACHHASITSADVANTAGESANDLIMITATIONS,DEPENDINGONTHEREQUIREDHOLEDIAMETERANDDEPTH,WORKPIECEMATERIALANDEQUIPMENTREQUIREMENTSTHISARTICLECOVERSHOLEMAKINGWITHTHROUGHCOOLANTDRILLSANDTHOSEWITHOUTCOOLANTHOLES,PLUNGEMILLING,MICRODRILLINGUSINGSINKEREDMSANDLASERDRILLINGHELPFULHOLESGETTINGCOOLANTTOTHEDRILLTIPWHILETHETOOLISCUTTINGHELPSREDUCETHEAMOUNTOFHEATATTHETOOL/WORKPIECEINTERFACEANDEVACUATECHIPSREGARDLESSOFHOLEDIAMETERBUTTHROUGHCOOLANTCAPABILITYISESPECIALLYHELPFULWHENDEEPHOLEMICRODRILLINGBECAUSETHETOOLSAREDELICATEANDPRONETOFAILUREWHENEXPERIENCINGRECUTTINGOFCHIPS,CHIPPACKINGANDTOOMUCHEXPOSURETOCARBIDE’SWORSTENEMYHEATWHENAPPLYINGFLOODCOOLANT,THEDRILLITSELFBLOCKSACCESSTOTHECUTTINGACTION“SOMEWHEREABOUT3TO5DIAMETERSDEEP,THECOOLANTHASTROUBLEGETTINGDOWNTOTHETIP,”SAIDJEFFDAVIS,VICEPRESIDENTOFENGINEERINGFORHARVEYTOOLCO,ROWLEY,MASS“ITBECOMESWISETOUSEACOOLANTFEDDRILLATTHATPOINT”TOPREVENTTHOSETINYCOOLANTHOLESFROMBECOMINGCLOGGEDWITHDEBRIS,DAVISALSORECOMMENDSA5ΜMORFINERCOOLANTFILTERANOTHERRECOMMENDATIONISTOMACHINEAPILOT,ORGUIDE,HOLETOPREVENTTHETOOLFROMWANDERINGONTOPOFTHEWORKPIECEANDAIDINPRODUCINGASTRAIGHTHOLEWHENAPPLYINGAPILOTDRILL,IT’SIMPORTANTTOSELECTONEWITHANINCLUDEDANGLEONITSPOINTTHAT’SEQUALTOORLARGERTHANTHEINCLUDEDANGLEONTHETHROUGHCOOLANTDRILLTHATFOLLOWSTHEPILOTDRILL’SDIAMETERSHOULDALSOBESLIGHTLYLARGERFOREXAMPLE,IFTHEPILOTDRILLHASA120INCLUDEDANGLEANDASMALLERDIAMETERTHANATHROUGHCOOLANTDRILLWITHA140INCLUDEDANGLE,“THENYOU’RECATCHINGTHECOOLANTFEDDRILL’SCORNERSANDKNOCKINGTHOSECORNERSOFF,”DAVISSAID,WHICHDAMAGESTHEDRILLLUBRICIOUSCHILLTOFURTHERAIDCHIPEVACUATION,DAVISRECOMMENDSAPPLYINGANOILBASEDMETALWORKINGFLUIDINSTEADOFAWATERBASEDCOOLANTBECAUSEOILPROVIDESGREATERLUBRICITYBUTIFASHOPPREFERSUSINGCOOLANT,THEFLUIDSHOULDINCLUDEEPEXTREMEPRESSUREADDITIVESTOINCREASELUBRICITYANDMINIMIZEFOAMING“IFYOU’VEGOTALOTOFFOAM,”DAVISNOTED,“THECHIPSAREN’TBEINGPULLEDOUTTHEWAYTHEYARESUPPOSEDTOBE”HEADDEDTHATANOTHERWAYTOENHANCEATOOL’SSLIPPERINESSWHILEEXTENDINGITSLIFEISWITHACOATING,SUCHASTITANIUMALUMINUMNITRIDETIALNHASAHIGHHARDNESSANDISANEFFECTIVECOATINGFORREDUCINGHEAT’SIMPACTWHENDRILLINGDIFFICULTTOMACHINEMATERIALS,LIKESTAINLESSSTEELDAVIDBURTON,GENERALMANAGEROFPERFORMANCEMICROTOOL,JANESVILLE,WIS,DISAGREESWITHTHEIDEAOFCOATINGMICROTOOLSONTHESMALLERENDOFTHESPECTRUM“COATINGSONTOOLSBELOW0020TYPICALLYHAVEAEFFECTONEVERYMACHININGASPECT,FROMTHEQUALITYOFTHEINITIALCUTTOTOOLLIFE,”HESAIDTHAT’SBECAUSECOATINGSARENOTTHINENOUGHANDNEGATIVELYALTERTHERAKEANDRELIEFANGLESWHENAPPLIEDTOTINYTOOLSHOWEVER,WORKCONTINUESONTHEDEVELOPMENTOFTHINNERCOATINGS,ANDBURTONINDICATEDTHATPERFORMANCEMICROTOOL,WHICHPRODUCESMICROENDMILLSANDMICROROUTERSANDRESELLSMICRODRILLS,ISWORKINGONAPROJECTWITHOTHERSTOCREATEASUBMICRONTHICKNESSCOATING“WE’REPROBABLY6MONTHSTO1YEARFROMTESTINGITINTHEMARKET,”BURTONSAIDTHEMICRODRILLSPERFORMANCEOFFERSAREBASICALLYCIRCUITBOARDDRILLS,WHICHAREALSOEFFECTIVEFORCUTTINGMETALALLTHETOOLSAREWITHOUTTHROUGHCOOLANTCAPABILITY“IHADACUSTOMERDRILLA0004DIAHOLEINSTAINLESSSTEEL,ANDHEWASAMAZEDHECOULDDOITWITHACIRCUITBOARDDRILL,”BURTONNOTED,ADDINGTHATPECKINGANDRUNNINGATAHIGHSPINDLESPEEDINCREASETHEDRILL’SEFFECTIVENESSTHEREQUIREMENTSFORHOWFASTMICROTOOLSSHOULDROTATEDEPENDONTHETYPEOFCNCMACHINESASHOPUSESANDTHETOOLDIAMETER,WITHHIGHERSPEEDSNEEDEDASTHEDIAMETERDECREASESNOTETHEEQUATIONFORCUTTINGSPEEDISSFMTOOLDIAMETER026SPINDLESPEEDALTHOUGHRELATIVELYLOW,5,000RPMHASBEENUSEDSUCCESSFULLYBYBURTON’SCUSTOMERS“WERECOMMENDTHATOURCUSTOMERSFINDTHEHIGHESTRPMATTHELOWESTPOSSIBLEVIBRATIONTHESWEETSPOT,”HESAIDINADDITIONTOMINIMIZINGVIBRATION,ACONSTANTANDADEQUATECHIPLOADISREQUIREDTOPENETRATETHEWORKPIECEWHILEEXERTINGLOWCUTTINGFORCESANDTOALLOWTHERAKETOREMOVETHEAPPROPRIATEAMOUNTOFMATERIALIFTHEDRILLTAKESTOOLIGHTOFACHIPLOAD,THERAKEFACEWEARSQUICKLY,BECOMINGNEGATIVE,ANDTOOLLIFESUFFERSTHISAPPROACHISOFTENTEMPTINGWHENDRILLINGWITHDELICATETOOLS“IFTHECUSTOMERDECIDESHEWANTSTOBABYTHETOOL,HETAKESALIGHTERCHIPLOAD,”BURTONSAID,“AND,TYPICALLY,THECUTTINGEDGEWEARSMUCHQUICKERANDCREATESARADIUSWHERETHELANDOFTHATRADIUSISWIDERTHANTHECHIPBEINGCUTHEENDSUPUSINGITASAGRINDINGTOOL,TRYINGTOBUMPMATERIALAWAY”FORTOOLSLARGERTHAN0001,BURTONCONSIDERSACHIPLOADUNDER00001TOBE“BABYING”IFTHEDRILLDOESN’TSNAP,PREMATUREWEARCANRESULTINABYSMALTOOLLIFETOOMUCHRUNOUTCANALSOBEDESTRUCTIVE,BUTHOWMUCHISDEBATABLEBURTONPOINTEDOUTTHATPERFORMANCEPURPOSELYDESIGNEDAMACHINETOHAVE00003TIRTOCONDUCTINHOUSE,WORSTCASEMILLINGSCENARIOS,ADDINGTHATTHECOMPANYISSTILLABLETOMILLA0004WIDESLOT“DAYINANDDAYOUT”HEADDED“YOUWOULDTHINKWITH00003RUNOUTANDACHIPLOADATHIRDTHAT,SAY,00001TO000015,THETOOLWOULDBREAKIMMEDIATELYBECAUSEONEFLUTEWOULDBETAKINGTHEENTIRELOADANDTHENTHEBACKENDOFTHEFLUTEWOULDBERUBBINGWHENDRILLING,HEINDICATEDTHATUPTO00003TIRSHOULDBEACCEPTABLEBECAUSEONCETHEDRILLISINSIDETHEHOLE,THECUTTINGEDGESONTHEENDOFTHEDRILLCONTINUECUTTINGWHILETHENONCUTTINGLANDSONTHEODGUIDETHETOOLINTHESAMEDIRECTIONMINIMIZINGRUNOUTBECOMESMORECRITICALASTHE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