外文翻译--铣床夹具设计特点.doc

MillingfixturedesignfeaturesFirst,themaintypesofmillingmachinefixtureandstructureoftheformMillingfixtureformachiningpartsonthemainplane,groove,keyway,spline,andthegapaswellasfaceshape.Usuallyasaresultofmillingfixturetabletogetherwiththefeedmovement,indifferentwaysaccordingtothefeedmillingfixturecanbedividedintostraight-linefeedtype,feedcircularmodeandrelyonthreetypesoffeed-type.1.Linearfeed-typemillingfixtureThistypeofmillingmachinewiththemost.Fixtureinstalledinthemillingmachinetable,theprocessinginastraightlinewiththefeedtablebywayofmovement.Accordingtotheworkpiecequality,structureandproductionquantitieswillbedesignedasaone-piecefixturepointsmorethantheparallelandmorethanarowfollowedbyclampingofthelinkageapproach,sometimestheuseofsub-degreeinstitutions,bothtoimproveproductionefficiency.2.Circle-typemillingmachinefixturefeedCirclefeedmillinginthecaseofnon-stoploadingandunloadingtheworkpiece,thegeneralisamulti-tasking,andinthemillingmachinerotarytableuse.Thisfixtureiscompactandeasytooperate,mobiletimeandauxiliarytimeoverlapishigh-performancemillingfixture,foruseinhigh-volumeproduction.3.BymoldmillingfixtureThismoduledependsonthemillingmachinewithafixtureusedindedicatedoruniversalmillingmachinesontheprocessingofvariousnon-circularsurface.Ontheroleofmoldistomakeaccesstosupplementarymotorworkpiecetoformaprofilecampaign.Movementbywayofthemainfeedthroughmodecanbedividedintostraight-linemillingmachinefixtureandcircleintothefeedtothetwo.Second,thedesignfeaturesofmillingfixtureAsaresultofmillingandcuttingforcecuttingmoreandmoreintermittentcuttingedge,easyprocessingofvibration,sotheyshouldpayattentiontothedesignofmillingmachinefixture:clampingforcetobesufficientself-lockingandanti-stroke；fixtureinstallationtobeaccurateandreliable,thatis,whentheprocessinginstallationandtheproperuseofdirectionalkeysontheknifedevice；specificfolderhavesufficientstiffnessandstability,thestructuremustbereasonable.Asaresultofmillingandcuttingforcecuttingmoreandmoreintermittentcuttingedge,easyprocessingofvibration,sotheyshouldpayattentiontothedesignofmillingmachinefixture:clampingforcetobesufficientself-lockingandanti-stroke；fixtureinstallationtobeaccurateandreliable,thatis,whentheprocessinginstallationandtheproperuseofdirectionalkeysontheknifedevice；specificfolderhavesufficientstiffnessandstability,thestructuremustbereasonable.1.DirectionalkeysDirectionalkeyposition,alsoknownaskeys,installedonthebottomoftheverticalslotfixture,generallywithtwo,aninastraightline,thefartherthedistance,thehighertheprecision-oriented,withscrewfasteninginthespecificfolder.Directionalkeysworkwiththemillingmachinewithtable-shapedslotinthemachinetoolfixturetodeterminethecorrectposition；canabsorbpartofthecuttingtorque,reducingtheloadonclampingbolttoincreasethestabilityofthefixture,soflatandsomespecialdrillingjigboringmachinefixtureisalsofrequentlyused.Directionalkeysarerectangularandroundtwo.2.OftheknifedeviceDevicesontheknifeblockandknifebythesideofthefootofthefixtureandtoolusedtodeterminetherelativeposition.Thestructureoftheformofaknifedependsontheshapeofthesurfaceprocessing.Directionalhigh-precisionfixtureshouldnotbeusedorheavydirectionalkeys,butinthespecificfolderononeelongatedsideprocessingasabasetolookforistheinstallationlocationcalibrationfixture.Knifeblockonthepinandscrewfastenercommonlyusedinthespecificfolder,itslocationshouldbeeasy-to-useplug-footontheknife,withoutprejudicetotheworkpieceloadingandunloading.Ontheknifewhentheknifecutterblockwithapluginbetweenthefeetwiththeknifetooltoavoiddirectcontactblockorcausedamagetotheknifebladeblockprematurewear.CypriotCypriotfeetareflatfeetandtwo-footcylindricalplug,thethicknessanddiameterof35mm,manufacturingtoleranceh6.Sideoftheknifeblockandfeethavebeenstandardized(thedesigncanbefoundintherelevantmanual),usethetotalfixtureSedatmapscaleshouldbemarkedontheknifeblocksizeandtheworksurfaceandpositioningthelocationbetweenthecomponents.Devicesshouldbeinstalledonthebladeoftheknifeandiseasytocutoneendoftheworkpiece.3.FolderspecificdesignToimprovethemillingfixtureinstalledinthemachinetoolstability,reduceitsintermittentcuttingmaybecausedbyvibration,notonlyinthespecificfolderhavesufficientstiffnessandstrength,theirheightandwidthratioshouldalsobeappropriate,ageneralH/B11.25,inordertoreducethefixturecenterofgravity,sothatascloseaspossibletotheworkpiecesurfacecountertops.Inaddition,wemustsetareasonableandearblockstostrengthenthetendons.Ifthefolderspecificwide,canbesetupinthesamesideoftwoT-slotmillingmachinetableequidistantbetweentheearsBlock；ofheavy-dutymillingfixtures,specificfoldersshouldalsobesetupatbothendsoftherings,suchasliftingholesortocarry.Inthemillingprocess,theofteninstalledinthemillingfixturetable,togetherwiththejigwiththeworkpiecefeedtableformovement.Inthemillingprocess,theofteninstalledinthemillingfixturetable,togetherwiththejigwiththeworkpiecefeedtableformovement.Accordingtotheworkpiecefeedmeansofgeneralmillingfixturecanbedividedintothefollowingtwotypes:1.Linearfeed-typemillingfixture。Inthemillingprocess,theofteninstalledinthemillingfixturetable,togetherwiththejigwiththeworkpiecefeedtableformovement.2.Circlefeedmillingfixture.Suchfixturesarecommonlyusedinthemillingmachinewithrotarytable,theworkpiecetable,togetherwiththefixturewiththecontinuous,slowmovementoftherotaryfeed,noparkingwillbeloadingandunloadingtheworkpiece.Accordingtotheprocessingrequirementsofthetwocutterheadcanalsoberoughatthesametime,finishingMillingisaflat,keyway,gearandavarietyofformingsurfaceprocessingmethodscommonlyused.Processingtheworkpieceinthemillingmachine,thegeneraladoptionofthefollowingtypesofclampingmethods:(1)directlyinthemillingmachinetableclampingalargeworkpiececlampingoftendirectlyinthetable,withstud,platecompactor,whichneedtodialindicatormethods,toolssuchaszonedtofindtheneedlesurfaceandthecutterisprocessingrelativeposition.(2)viceflattoolusedforclampingtheworkpieceintheshapeofasimple,smallparts,generalmachinetoolscanbeusedinclampingviceinthemouth,theneedtoensurethatwhenusedinmachinevicethecorrectposition.(3)dividingheadwiththeworkpiececlamping,theneedforindexingoftheworkpiece,thegeneraldirectclampingheadinthesub-degrees.Inaddition,indexingoftheworkpiecewithoutdividingheadwithclampingprocessingisalsoveryconvenient.(4)withV-shapedframeworkpiececlampingmethodisgenerallyapplicabletoshaftparts,inadditiontohavingabetterthanneutral,butalsotobearagreatercuttingforce.铣床夹具设计特点一、铣床夹具的主要类型及结构形式铣床夹具主要用于加工零件上的平面、凹槽、键槽、花键、缺口及各种成形面。由于铣削加工通常是夹具随工作台一起作进给运动，按进给方式不同铣床夹具可分为直线进给式、圆周进给式和靠模进给式三种类型。1直线进给式铣床夹具这类铣床用得最多。夹具安装在铣床工作台上，加工中随工作台按直线进给方式运动。根据工件质量、结构及生产批量，将夹具设计成单件多点、多件平行和多件连续依次夹紧的联动方式，有时还要采用分度机构，均为了提高生产效率。2圆周进给式铣床夹具圆周进给铣削方式在不停车的情况下装卸工件，一般是多工位，在有回转工作台的铣床上使用。这种夹具结构紧凑，操作方便，机动时间与辅助时间重叠，是高效铣床夹具，使用于大批量生产。3.靠模铣床夹具这种带有靠模的铣床夹具用在专用或通用铣床上加工各种非圆曲面。靠模的作用是使工件获得辅助运动，形成仿形运动。按主进给运动方式，靠模铣床夹具可分为直线进给和圆周进给两种。二、铣床夹具的设计要点由于铣削加工切削用量及切削力较大，又是多刃断续切削，加工时易产生振动，因此设计铣床夹具时应注意：夹紧力要足够且反行程自锁；夹具的安装要准确可靠，即安装及加工时要正确使用定向键、对刀装置；夹具体要有足够的刚度和稳定性，结构要合理。1定向键