外文翻译--小孔钻在工程塑料片材方面及其精度估算.doc外文翻译--小孔钻在工程塑料片材方面及其精度估算.doc

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英文原文SMALLHOLEDRILLINGINENGINEERINGPLASTICSSHEETANDITSACCURACYESTIMATIONHIROKIENDOANDETSUOMARUIABSTRACTINRECENTMANUFACTURINGPROCESSES,THESMALLDIAMETERHOLEDRILLINGPROCESSISFREQUENTLYUSEDOWINGTOITSGOODCHARACTERISTICSTHEDRILLINGPROCESSCANEASILYBEADAPTEDTOWIDEVARIATIONSINLOTSIZE,PROCESSINGACCURACY,PROCESSINGSPOTPATTERNSWHEREHOLESAREMADE,ANDSOONMANYMACHINEELEMENTS,WHICHHAVESMALLDIAMETERHOLES,AREMANUFACTUREDUSINGENGINEERINGPLASTICSOFSUPERIORMATERIALANDMACHININGPROPERTIESHOWEVER,ITISNOTEASYTODRILLHOLESWITHADIAMETERSMALLERTHAN1MM,INRECENTMACHININGTECHNOLOGYASWELLINTHISREPORT,1MMDIAMETERHOLESAREDRILLEDONTWOENGINEERINGPLASTICSSHEETSANDTHEIRDRILLINGACCURACYISDISCUSSEDKEYWORDSSMALLDIAMETERHOLE;DRILLING;ENGINEERINGPLASTICS;MACHININGACCURACY1INTRODUCTIONPROCESSINGOFSMALLDIAMETERHOLESISDONEINVARIOUSMATERIALS,CORRESPONDINGTOTHETRENDOFDOWNSIZINGORHIGHACCURACYINPARTSINCORPORATEDINTOELECTRONICEQUIPMENTS,MEDICALINSTRUMENTSORTEXTILEMACHINERIESMANYTECHNIQUESAREPUTTOPRACTICALUSE,INCLUDINGDRILLING,ULTRASONICMACHINING,ELECTRICDISCHARGEMACHINING,ELECTROLYTICMACHINING,LASERBEAMMACHINING,ELECTRONBEAMMACHINING,FLUIDORABRASIVEJETMACHINING,ANDCHEMICALBLANKINGDEPENDINGONTHEWORKPIECEMATERIAL,THEMACHININGACCURACY,ANDTHELOTSIZE,THEBESTPROCESSFORMAKINGHOLESOFSMALLDIAMETERMAYBEAPPROPRIATELYSELECTEDWITHINTHESEVARIOUSMACHININGPROCESSES,THEDRILLINGPROCESSCANREADILYDEALWITHAWIDEVARIETYOFMACHININGCONDITIONSHOWEVER,THEREARESOMEDIFFICULTPROBLEMSINDRILLINGHOLESSMALLERTHAN1MMINDIAMETERFOREXAMPLE,ALARGELOADCANNOTBEPUTONSMALLDRILLS,OWINGTOTHEIRLOWSTRENGTHANDRIGIDITYTHUS,THEFEEDRATEPERUNITDRILLROTATIONMUSTBESETSMALLTHEREMOVALOFDRILLEDCHIPSISDIFFICULTOWINGTOTHESMALLDRILLFLUTEAREAINMANYCASES,ENGINEERINGPLASTICSAREUSEDINMAKINGVARIOUSMACHINEPARTSBECAUSETHEYARELIGHTANDHAVESUPERIORSPECIFICSTRENGTHTHATIS,THERATIOOFTENSILESTRENGTHTODENSITYCOMPAREDWITHCARBONSTEELALSO,THEMATERIALCOSTOFENGINEERINGPLASTICSISCOMPETITIVEANDTHEIRMACHINABILITYISFAIRLYGOODWITHTHESEPOINTSASBACKGROUND,THEORTHOGONALCUTTINGOFENGINEERINGPLASTICSWASINVESTIGATED1ANDITWASSUGGESTEDHERETHATTHEVISCO–ELASTICPROPERTIESOFENGINEERINGPLASTICSHAVESOMEEFFECTSONTHEMAGNITUDEOFCUTTINGFORCEANDTHESURFACEROUGHNESSOFMACHINEDSURFACESTHEREISAREVIEWPAPER2REGARDINGTHEMACHININGOFENGINEERINGPLASTICSINTHISREVIEWPAPER,DRILLINGPROCESSWASALSOTREATEDITWASPOINTEDOUTTHATTHEHEATINGUPOFTHEWORKPIECEDUETOBUILDUPOFSWARFONDRILLFLUTESISANOBSTACLETOTHEDRILLINGPROCESSOFENGINEERINGPLASTICSRECENTLY,SOMEEXPERIMENTSHAVEBEENATTEMPTEDONDRILLINGGLASS–FIBERREINFORCEDENGINEERINGPLASTICSSHEETS3AND4,ANDTHETHRUSTFORCEANDTORQUEDURINGDRILLINGHAVEBEENMEASUREDINTHESEPAPERS,ITWASREPORTEDTHATTHEDELAMINATIONPHENOMENONDECREASESTHEDRILLEDHOLEINTEGRITY,WHENHOLESOFABOUT5MMDIAMETERAREDRILLEDHOWEVER,THEINVESTIGATIONONTHEACCURACYINSMALLHOLEDRILLINGOFENGINEERINGPLASTICSISLEFTPENDINGTHENINTHISPAPER,SMALLDIAMETERHOLESOF1MMAREDRILLEDINTWOTYPICALENGINEERINGPLASTICSSHEETS,ANDTHEEFFECTOFSPINDLESPEEDANDFEEDRATEONTHEACCURACYRADIUSERRORISESTIMATED2WORKPIECEMATERIALSTWOTYPICALENGINEERINGPLASTICSSHEETS,POLYACETALPOMANDPOLYETHERIMIDEPEI,WEREDRILLEDTHEMATERIALSPROPERTIESARELISTEDINTABLE1TABLE1MATERIALPROPERTIESOFWORKPIECEENGINEERINGPLASTICSPERFORMANCEUNITPOMPEISPECIFICGRAVITY141127RATEOFWATER022025MELTINGPOINTC165210COEFFICIENTOFLINEARTHERMALEXPANSIONCM/CM/C910−55610−5TENSILESTRENGTHMPA61124TENSILEEXTENSIONYIELDINGPOINT4023BENDINGSTRENGTHMPA89157BENDINGELASTICITYGPA260307PERFORMANCEUNITPOMPEICOMPRESSIVESTRENGTHMPA103118IZOTEIMPACTVALUEJ/M7442ROCKWELLHARDNESSMSCALE119127POLYACETALISACRYSTALLIZEDENGINEERINGPLASTICSMATERIALTHEMAINRAWMATERIALSAREACETALCOPOLYMERANDHOMOPOLYMERPOMHASGOODFATIGUEPROPERTIESANDMACHINABILITYMANYCAMS,GUIDESANDLINERSAREMADEOFPOMVERYHIGHACCURACYISNEEDEDINTHESEMACHINEDPARTSPEIISANAMORPHOUSENGINEERINGPLASTICHAVINGSUPERIORTHERMALRESISTANCECHARACTERISTICSSPECIALELECTRICALPARTS,FOREXAMPLE,ELECTRICINSULATORS,CONNECTORS,AREMADEOFPEI,WHICHISSUPERIORINMECHANICALSTRENGTHBUTINFERIORINMACHINABILITYTOPOMTHEWORKPIECESIZEWASLENGTH100MM,WIDTH50MMANDTHICKNESS08MM3EXPERIMENTALAPPARATUSANDPROCEDURETHEDRILLINGMACHINEUSEDISFORSMALLDIAMETERHOLES,ANDISEQUIPPEDWITHANAUTOMATICFEEDMECHANISMAHIGHFREQUENCYINDUCTIONMOTORPOSITIONEDATTHEUPPERMOSTPOSITIONOFTHEMAINSPINDLEDRIVESTHESPINDLEMAXIMUMSPINDLESPEEDIS12,500RPMTHENETSPINDLESPEEDOFTHESPINDLEDURINGTHEDRILLINGISMEASUREDBYATACHOMETER,WHICHCOUNTSNUMBEROFTHELASERBEAMREFLECTEDFROMAREFLECTIVETAPEPASTEDONTHESCROLLCHUCKASERVOMOTORFORDRILLFEEDDRIVESTHEFEEDMOTIONOFTHESPINDLETHEFEEDISSTEPLESS,ANDADIALGAUGEEQUIPPEDATTHESPINDLEHEADMEASURESTHELENGTHOFTHEDRILLMOTIONINTHESPINDLEAXISDIRECTIONASTOPWATCHWASUSEDTOMEASURETHETIMENEEDEDFORTHISLENGTHTHERATIOOFTHEMOVEDLENGTHTOTHETIMEISTHESUBSTANTIALFEEDRATEPERUNITTIMETHESPINDLESPEEDWASVARIEDBETWEEN1250AND12,500RPMANDALSOTHEFEEDRATEPERUNITTIMEWASVARIEDBETWEEN0405AND1986MM/SSPINDLESPEEDWASVARIEDINKEEPINGWITHTHEFEEDRATEPERUNITTIMEHENCE,THEFEEDRATEPERUNITDRILLROTATIONBECAMESMALLWITHTHEINCREASEINTHESPINDLESPEEDOFTHEDRILLTHEDRILLSPINDLEENDISATTACHEDTOTHESCROLLCHUCKTHEDRILLUSEDHEREISACONVENTIONALTWISTDRILLMADEOFHIGHSPEEDSTEELWITHADIAMETEROF1MMINSOMEEXTRAEXPERIMENTS,A03MMDIAMETERDRILLWASALSOUSEDSUCHDRILLSHAVENOSURFACETREATMENTADIALGAUGEESTIMATESDEFLECTIONACCURACYOFTHEDRILLONTHESCROLLCHUCKDURINGROTATIONEXTREMECAREWASTAKENSOTHATTHEDRILLDEFLECTIONWASSMALLERTHAN5ΜMTHESAMEDRILLMADEFIVEHOLESUNDERTHECUTTINGCONDITIONOFTHESAMESPINDLESPEEDANDTHESAMEFEEDRATEANOTHERDRILLWASUSEDINTHEDRILLINGUNDERANOTHERCUTTINGCONDITIONOFCOURSE,THESIZEACCURACYOFTHESEDRILLSEXISTSWITHINTHEABOVEMENTIONEDSIZESCATTERINGANYEVIDENCEOFTHEWEAROFDRILLSANDTHEBUILDUPOFSWARFONDRILLFLUTESWERENOTRECOGNIZEDAFTERFIVEHOLESDRILLINGFORMERLYMENTIONEDWORKPIECEOFENGINEERINGPLASTICSWERESETONTHEBASEOFTHEDRILLINGMACHINEBYCLAMPINGBOLTSDRYCUTTINGWITHOUTFLUIDWASPERFORMED4CALCULATIONOFDRILLEDHOLESHAPESTHE1MMDIAMETERHOLESDRILLEDONENGINEERINGPLASTICSSHEETSBYTHEPROCESSDESCRIBEDABOVEARENOTGEOMETRICALLYTRUECIRCLES,BUTHAVEASMALLRADIALDEVIATIONSHAPEACCURACYOFTHEDRILLEDHOLESISESTIMATEDBYTHEFOLLOWINGPROCESSANOPTICALMICROSCOPEEQUIPPEDWITHDIGITALMEASURINGDEVICEMEASURESTHESHAPEOFTHEDRILLEDHOLETHECROSSWIREOFTHEMICROSCOPEISSETATTHECIRCUMFERENCEOFTHEHOLETHEN,THECOORDINATESX,YOFTHEHOLECIRCUMFERENCEAREREADDIVIDINGTHECIRCUMFERENCEINTO18EQUALPARTS,THESAMEMEASUREMENTSARETHENREPEATEDONEACHSPOTONTHECIRCUMFERENCEUSINGTHESE18SETSOFMEASUREDQUALITIES,THEEQUATIONOFTHECIRCLETHATFITSCLOSELYTOTHEDRILLEDHOLEISCALCULATEDTHISISCALLEDALEASTSQUARECIRCLE,ANDINTHECALCULATION,THELEASTSQUARESMETHODISAPPLIEDTHEEQUATIONOFTHELEASTSQUARECIRCLEISASSUMEDASFOLLOWSX2Y2AXBYC01OWINGTOTHESHAPEERROROFTHEHOLE,THERIGHTHANDSIDEOFEQ1DOESNOTBECOMEZEROWHENTHEABOVEMENTIONEDMEASUREDQUALITIESXI,YIARESUBSTITUTEDTHERESIDUALINTHISCASEISVIANDTHEFOLLOWINGEQUATIONISOBTAINED2HERE,THECOEFFICIENTSA,B,CINEQ1AREDETERMINEDASTHESUMOFTHESQUAREDVALUESOFTHERESIDUALVIBECOMESMINIMUMVALUESOFTHESECOEFFICIENTSAREOBTAINEDBYSOLVINGTHEFOLLOWINGSIMULTANEOUSLINEAREQUATIONSINTHECALCULATION,N18
编号:201311171612317151    类型:共享资源    大小:281.16KB    格式:DOC    上传时间:2013-11-17
  
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