文献翻译切削参数的改变对切削温度的影响.docx
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文献翻译切削参数的改变对切削温度的影响.docx
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文献翻译切削参数的改变对切削温度的影响
IntroductionofMachining
Haveashapeasaprocessingmethod,allmachiningprocessfortheproductionofthemostcommonlyusedandmostimportantmethod.Machiningprocessisaprocessgeneratedshape,inthisprocess,Driversdeviceontheworkpiecematerialtobeintheformofchipremoval.Althoughinsomeoccasions,theworkpieceundernocircumstances,theuseofmobileequipmenttotheprocessing,however,themajorityofthemachiningisnotonlysupportingtheworkpiecealsosupportingtoolsandequipmenttocomplete.
Machiningknowtheprocesshastwoaspects.Smallgroupoflow-costproduction.Forcasting,forgingandmachiningpressure,everyproductionofaspecificshapeoftheworkpiece,evenasparepart,almosthavetospendthehighcostofprocessing.Weldingtorelyontheshapeofthestructure,toalargeextent,dependoneffectiveintheformofrawmaterials.Ingeneral,throughtheuseofexpensiveequipmentandwithoutspecialprocessingconditions,canbealmostanytypeofrawmaterials,mechanicalprocessingtoconverttherawmaterialsprocessedintothearbitraryshapeofthestructure,aslongastheexternaldimensionslargeenough,itispossible.Becauseofaproductionofspareparts,evenwhenthepartsandstructureoftheproductionbatchsizesaresuitablefortheoriginalcasting,Forgingorpressureprocessingtoproduce,butusuallyprefermachining.
Strictprecisionandgoodsurfacefinish,machiningthesecondpurposeistheestablishmentofthehighprecisionandsurfacefinishpossibleonthebasisof.Manyparts,ifanyothermeansofproductionbelongingtothelarge-scaleproduction,WellMachiningisalow-toleranceandcanmeettherequirementsofsmallbatchproduction.Besides,manypartsontheproductionandprocessingofcoarseprocesstoimproveitsgeneralshapeofthesurface.Itisonlynecessaryprecisionandchoosesonlythesurfacemachining.Forinstance,thread,inadditiontomechanicalprocessing,almostnootherprocessingmethodforprocessing.Anotherexampleistheblacksmithpieceskeyholeprocessing,aswellastrainingtobeconductedimmediatelyafterthemechanicalcompletionoftheprocessing.
PrimaryCuttingParameters
Cuttingtheworkpieceandtoolbasedonthebasicrelationshipbetweenthefollowingfourelementstofullydescribe:
thetoolgeometry,cuttingspeed,feedrate,depthandpenetrationofacuttingtool.
CuttingToolsmustbeofasuitablematerialtomanufacture,itmustbestrong,tough,hardandwear-resistant.Toolgeometry--tothetipplaneandcutteranglecharacteristics--foreachcuttingprocessmustbecorrect.
Cuttingspeedisthecuttingedgeofworkpiecesurfacerate;itisinchesperminutetoshow.Inordertoeffectivelyprocessing,andcuttingspeedmustadapttothelevelofspecificparts--withknives.Generally,themorehardworkpiecematerial,thelowertherate.
ProgressiveTooltospeediscutintotheworkpiecespeed.Iftheworkpieceortoolforrotatingmovement,feedrateperroundoverthenumberofinchestothemeasurement.Whentheworkpieceortoolforreciprocatingmovementandfeedrateoneachtripthroughthemeasurementofinches.Generally,inotherconditions,feedrateandcuttingspeedisinverselyproportionalto。
Depthofpenetrationofacuttingtool--toinchesdollars--isthetooltotheworkpiecedistance.Rotarycuttingittothechiporequaltothewidthofthelinearcuttingchipthickness.Roughthanfinishing,deeperpenetrationofacuttingtooldepth.
WearsofCuttingTool
Wealreadyhavebeenprocessedandtherattleofthecountlesscracksedgetool,welearnthattoolweararebasicallythreeforms:
flankwear,theformerflankwearandV-Notchwear.Flankwearoccurredinboththemainbladeoccurredviceblade.Onthemainblade,shoulderremovedbecausemostmetalchipmandate,whichresultedinanincreasecuttingforceandcuttingtemperatureincrease,Ifnotallowedtocheck,Thatcouldleadtotheworkpieceandthetoolvibrationandprovideforefficientcuttingconditionsmaynolongerexist.Vice-bladedon,itisdeterminedworkpiecedimensionsandsurfacefinish.Flankwearsizeofthepossiblefailureoftheproductandsurfacefinisharealsoinferior.Inmostactualcuttingconditions,astheprincipalintheformerfirstdeputyflankbeforeflankwear,weararrivalenough,Toolwillbeeffective;theresultsaremadeunqualifiedparts.
AsToolstressonthesurfaceuneven,chipandflankbeforeslidingcontactzonebetweenstresses,inslidingcontactthestartofthelargestandincontactwiththetailofzero,soabrasivewearintheregionoccurred.Thisisbecausethecardcuttingedgethanthenearbysettlementsnearthemoreseriouswearandbladedchipduetothevicinityoftheformerflankandlostcontactwearslighter.ThisresultsfromacertaindistancefromthecuttingedgeofthesurfaceformedbeforetheknifepointMapit,whichisusuallyconsideredbeforewear.Undernormalcircumstances,thisiswearcross-sectionalshapeofanarc.Inmanyinstancesandfortheactualcuttingconditions,theformerflankwearcomparedtoflankwearlight,Thereforeflankwearmoregenerallyasatoolfailureofscalesigns.Butbecausemanyauthorshavesaidinthecuttingspeedoftheincrease,Mateosurfacetemperaturethantheknifesurfacetemperatureshaverisenfaster.Butbecauseanyformofwearrateisessentiallytemperaturechangesbythesignificantimpact.Therefore,theformerusuallywearinhigh-speedcuttinghappen.
Themaintoolflankwearthetailisnotprocessedwiththeworkpiecesurfaceincontact,Thereforeflankwearthanwearalongwiththeendsmorevisible,whichisthemostcommon.Thisisbecausethelocaleffect,whichisasroughonthesurfacehashardenedlayer,thiseffectisbycuttinginfrontofthehardeningoftheworkpiece.Notjustcutting,andasoxidationskin,thebladelocalhightemperaturewillalsocausethiseffect.Thispartialwearnormallyreferredtoaspitsexualwear,butoccasionallyitisveryserious.DespitetheemergenceofthepitsontheCuttingToolnatureisnotmeaningfulimpact,butoftenpitsgraduallybecomedarkerIfcuttingcontinuedthecase,thentherecutterfracturecrisis.
Ifanyformofsexualallowedtowear,eventuallywearrateincreaseobviouslywillbeatooltodestroyfailuredestruction,thatwillnolongertoolforcutting,causetheworkpiecescrapped,itisgood,cancauseseriousdamagemachine.Forvariouscarbidecuttingtoolsandforthevarioustypesofwear,intheeventofaseriouslapse,onthetoolthathasreachedtheendofthelifecycle.Butforvarioushigh-speedsteelcuttingtoolsandwearbelongingtothenon-uniformityofwear,hasbeenfound:
Whenthewearandeventoallowforaseriouslapse,themostmeaningfulisthatthetoolcanre-milluse,ofcourse,Inpractice,cuttingthetimetousethantheshorttimelapse.Severalphenomenaareonetoolseriouslapsebeganfeatures:
themostcommonisthesuddenincreasecuttingforce,appearedontheworkpieceburningringpatternsandanincreaseinnoise.
TheEffectofChangesinCuttingParametersonCuttingTemperatures
Inmetalcuttingoperationsheatisgeneratedintheprimaryandsecondarydeformationzonesandthisresultinacomplextemperaturedistributionthroughoutthetool,workpieceandchip.Atypicalsetofisothermsisshowninfigurewhereitcanbeseenthat,ascouldbeexpected,thereisaverylargetemperaturegradientthroughoutthewidthofthechipastheworkpiecematerialisshearedinprimarydeformationandthereisafurtherlargetemperatureinthechipadjacenttothefaceasthechipisshearedinsecondarydeformation.Thisleadstoamaximumcuttingtemperatureashortdistanceupthefacefromthecuttingedgeandasmalldistanceintothechip.
Sincevirtuallyalltheworkdoneinmetalcuttingisconvertedintoheat,itcouldbeexpectedthatfactorswhichincreasethepowerconsumedperunitvolumeofmetalremovedwillincreasethecuttingtemperature.Thusanincreaseintherakeangle,allotherparametersremainingconstant,willreducethepowerperunitvolumeofmetalremovedandcuttingtemperatureswillreduce.Whenconsideringincreaseinunreformedchipthicknessandcuttingspeedthesituationismorecomplies.Anincreaseinunreformedchipthicknessandcuttingspeedthesituationismorecomplex.Anincreaseinundeformedchipthicknesstendstobeascaleeffectwheretheamountsofheatwhichpasstotheworkpiece,thetoolandchipremaininfixedproportionsandthechangesincuttingtemperaturetendtobesmall.Increaseincuttingspeed;however,reducetheamountofheatwhichpassesintotheworkpieceandthisincreasethetemperatureriseofthechipinprimarydeformation.Further,thesecondarydeformationzonetendstobesmallerandthishastheeffectofincreasingthetemperaturesinthiszone.Otherchangesincuttingparametershavevirtuallynoeffectonthepowerconsumedperunitvolumeofmetalremovedandconsequentlyhavevirtuallynoeffectonthepowerconsumedperunitvolumeofmetalremovedandconsequentlyhavevirtuallynoeffectonthecuttingtemperatures.Sinceithasbeenshownthatevensmallchangesincuttingtemperaturehaveasignificanteffectontoolwearrate,itisappropriatetoindicatehowcuttingtemperaturescanbeassessedfromcuttingdata.
Themostdirectandaccuratemethodformeasuringtemperaturesinhigh-speed-steelcuttingtoolsisthatofWright&Trentwhichalsoyieldsdetailedinformationontemperaturedistributionsinhigh-speed-steeltoolswhichrelatesmicrostructuralchangestothermalhistory.
Trenthasdescribedmeasurementsofcuttingtemperaturesandtemperaturedistributionsforhigh-speed-stee
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- 关 键 词:
- 文献 翻译 切削 参数 改变 温度 影响