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1、Machineclassificationandposefixture1fixtureintheroleofmachiningWorkpiececlampingfixtureisakindofprocessequipment,itiswidelyusedinmechanicalmachiningofthemanufacturingprocess,heattreatment,assembly,weldingandtestingprocesses.Intheuseofmetal-cuttingmachinetoolscollectivelyreferredtoasthejigfixture.nam
2、odernproductionmachineisanindispensablefixtureoftheprocessequipment,machiningoftheworkpiece,theprocessingrequirementsinordertoensure.Firstofalltotheworkpieceandthemachinetoolrelativetoacorrectposition,andthislocationduringprocessingdoesnotchangetheimpactofexternalforces.Tothisend,duringthepre-machin
3、ing,workpiececlampingmustbegood.Therearetwowaystoclampworkpiece:oneisdirectlyclampingtheworkpieceinthemachinetableoronthechuck；Theotheristheworkpieceinthefixtureonthefixture.Thefirstmethodusedwhentheworkpiececlamping,thegeneraldesignrequirementshavetopresslinesinthesurfacetodrawthesizeandlocation,cl
4、amping,orwhentheneedleiszoneddialindicatortofindisaftertheclamping.Thismethodneedspecialequipment,butlowefficiency,aregenerallyusedforone-pieceandsmallbatchproduction.Largequantities,mostlywiththeworkpiececlampingfixture.Withthemeritsoftheworkpiececlampingfixturesareasfollows:(l)Guaranteethestabilit
5、yofthemachiningaccuracyofworkpiece.Workpieceswithclampingfixture,theworkpiecerelativetothelocationoftoolandmachinetooltoensuretheaccuracyofthefixturefromthetechnicallevelofworkers,sothatanumberofworkpiecemachiningaccuracyoftheline.(2)Toimprovelaborproductivity.Workpiececlampingfixturecanfacilitateth
6、eusereasily、rapidly,andtheworkpiecedoesnotneedtofindiscrossed,cansignificantlyreducethesupplementaryworkinghours,toimprovelaborproductivity；workpieceinthefixtureafterthefixturetoimprovetherigidityoftheworkpiece,thuscuttingtheamountofincrease,toimprovelaborproductivity；canusemorepiecesofmulti-workpie
7、ceclampingfixture,andtheuseofefficientclampingbodies,tofurtherimprovelaborproductivity.(3)Toexpandtheuseofmachinetools.Machinetoolsingeneraluseadedicatedmachinetoolfixturecanexpandthescopeoftheprocessandgivefullplaytothepotentialofmachinetoolstoachieveamulti-machineuse.Forexample,theuseofadedicatedf
8、ixturecanbeeasilyLatheprocessingsmallboxtotheworkpiece.Eveninthelatheoutofoil,areductionofexpensivededicatedmachines,reducingthecost,whichisparticularlyimportantforsmallandmedium-sizedfactories.(4)Toimprovetheoperatorsworkingconditions.Asthepneumatic,hydraulic,electro-magneticpowersource,suchastheap
9、plicationinthefixture,ontheonehandtoreducethelaborintensityofworkers；theotherhand,itguaranteesthereliabilityoftheworkpiececlamping,andtoachievetheinterlockingmachine,toavoidaccidents,ensuretheoperatorsafetyandmachinetoolequipment(5)Toreducecosts.Inmassproductionaftertheuseoffixture,fromstemtoincreas
10、elaborproductivity,lowerleveltechnicalworkers,aswellaslowerscrapandotherreasons,obviouslytoreducetheproductioncosts.Fixturemanufacturingcost-sharinginagroupofworkpieces,eachworkpiecetoincreasethecostisveryminimal,farlessthanasaresultofincreasedlaborproductivityandreducecosts.Thegreatervolumeofworkpi
11、ece,fixturemadetousehasbecomemoresignificanteconomicbenefits.2FixtureCategory2.1GeneralcharacteristicsofthefixturebyCategoryAccordingtotheproductionindifferenttypesoffixturesinthecommoncharacteristicsofmachinetoolfixturefixturecanbedividedintogeneral,specialfixtures,adjustableclamp,andautomaticlineo
12、fmodularfixturefixture,suchas:(l)GeneralFixture.Universalfixturereferstothestructure,sizehasbeenstandardized,andhasacertainuniversalfixture.Thistypeoffixtureadaptable,canbeusedtosetupthescopeofacertainshapeandsizeofvariousparts.(2)Adedicatedfixture.Thistypeoffixtureisdesignedforaparticularpartofthep
13、rocessingproceduresandthedesignandmanufacture.Relativelystableintheproduct,theproductionoflargerquantities,usedavarietyofspecialfixtures,accesstohigherproductivityandmachiningaccuracy.(3)Adjustablefixture.Adjustablefixtureforgeneralfixtureandspecialfixtureandthedefectsdevelopedanewkindoffixture.Ofdi
14、fferenttypesandsizesoftheworkpiece,simplyadjustorreplacethefixtureattheoriginallocationoftheindividualcomponentsandwillbeusedtoclampcomponents.（4)ModularFixture.Modularfixtureisamodularfixture.Standardcomponentsofthemodulewithhighprecisionandresistancetoabrasion,canbeassembledintoavarietyoffixtures.
15、Removablefixtureusedtocleantheassemblyafterthenewfixtureleft.（5)Automaticlinefixture.Automaticlineclampgenerallydividedintotwocategories:fixed-typefixture,whichissimilartoadedicatedfixture；otheraccompanyingafixturefortheuseoftheworkpieceinthefixture,togetherwiththemovement,andautomaticworkpiecealong
16、thelinefromamovetothenextpositionpositionforprocessing.2.2ClassificationbytheuseofmachinetoolsClassificationBytheuseofmachinetoolscanbedividedintolathejigfixtures,millingfixtures,drillingfixtures,hang-bedfixture,jiggearmachine,CNCmachinetoolfixture,automaticmachinetoolfixtures,accompaniedbyautomatic
17、line,andotherfixtures,suchasmachinetools.Thisisaspecialfixturedesignoftheclassificationmethodused.Dedicatedfixturedesign,themachinegroup,thetypeandthemainparametershavebeendetermined.Theirdifferenceisthecuttingformingmachinetoolmovements,sotheconnectionfixturewiththemachineindifferentways.Machininga
18、ccuracyoftheirdifferentrequirements.2.3ClampingfixtureaccordingtothepowersourceClampingfixtureaccordingtothepowersourcecanbedividedintomanualfixture,pneumaticfixtures,hydraulicfixtures,gasfixturesbyforce,electromagneticfixture,vacuumfixtures,fixture,suchascentrifugalforce.3thecompositionoffixtureAlt
19、houghthestructureofmachinetoolfixturerange,buttheircomponentscanbesummarizedasthefollowingsections.(1)Positioningcomponents.Typically,whentheshapeoftheworkpiecedatumpositionestablished,thepositionwillbethebasiccomponentsofthestructureidentified(2)Clampingdevice.Positioningoftheworkpieceinthefixture,
20、theneedtoclamptheworkpiecebeforeprocessingtoensurethattheworkpieceduringprocessingisnotduetoexternalforceandundermineitsposition.(3)Thespecificfolder.Fixtureandtheskeletonmatrix,allthecomponentsthroughthefixtureitwillconstituteawhole.(4)Oftheknifeortheguide.Toolusedtodeterminepositionrelativetotheco
21、rrectpositionofcomponents.Oftheknifedevicecommoninmillingfixture.Usedtoadjustthecutterknifeblockpositionbeforemachining.(5)Toconnectcomponents.Connectedcomponentsinthemachinetoolfixtureistodeterminethecorrectpositiononthecomponent,therefore,candoubleasaspecificfoldertoconnectcomponents.Lathefixtureonthetransitionplate,thepositioningofmillingmachinefixtureonkeycomponentsareconnected.(6)Otherdevicesorcomponents.Accordingtotheprocessingneeds,somedegreefixturedevicewereusedbymodedevice,thewholedevice,andthebalanceofthetopblockandsoon.Thesecomponentsordevicesspeciallydesignedneed.
機(jī)械外文翻譯--機(jī)床夾具的分類與構(gòu)成.doc
