液压夹具设计手册.ppt

液压夹具设计手册.ppt

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液压夹具设计手册思诚机电2GoodFixtureDesignGoodfixturesposition,clampandsupportworkpiecesinthemosteffectivewaypossible3Fixturedesign,workpieceExample14Fixturedesign,process5DatumFixturedesign,workpiecedatums6Fixturedesign,supporting7Fixturedesign,positioning8Fixturedesign,clamping9Fixturedesign,additionalsupportandclamping10Fixture,positioning,supportingandclamping11Fixturedesign,workpiece,Example212Fixturedesign,process13Fixturedesign,supporting14Fixturedesign,clampingXX15Fixturedesign,clampingDatum16Fixturedesign,positioningandclamping17Fixturedesign,positioning,supporting&clamping18FrictionclampingIfclampingusingfrictiononlyitmustberememberedthatthecoefficientoffriction（）isnormallycalculatedat0.1ClampingforceFReactionforceTotalclampingforce=FxClampingforceFReactionforceTotalclampingforce=FClampingforceF2-30fromhorizontalPreferable19FrictionclampingIfclampingusingfrictiononlyitmustberememberedthatthecoefficientoffriction（）isnormallycalculatedat0.1Thiscanbeimprovedonsoftmaterials（eg.Al）iftheclampingpistonhasenoughforcetopenetratetheworkpiece20FixturedesignDEFINITIONOFACLAMPINGFORCETheforceactingonaworkpiecetobeclamped,islargeenoughtoholdtheworkpiecefirmlyinitsgivenpositionrelativetothecuttingtool,againsttheactionofthemachiningforces21FixturedesignCLAMPINGFORCESnMechanicalnlowcost,relativelylowforcesnPneumaticnhighercost,relativelylowforces,largecomponentsnHydraulicnhigherinitialcost,highforces,reliable,smallcomponents22MechanicalForcesMaximumclampingforceusingstandardwrenchClampingforce（kN）Clampingforcewithextensionpiecesasshown,500Ntorque,=0.123StandardclampingstrapM20threadMax.recommendedtorque223NmMax.clampingforce28kNHydraulicswingclamp6951F-11-21（page63,metriccatalogue）22rod,76mmlongarmMax.oilpressure23MPaClampingforce7.3kNForcecomparison24ForcecomparisonStandardclampingstrapM20threadMax.recommendedtorque223NmMax.clampingforce28kNHydraulicswingclamp6951F-11-21（page63,metriccatalogue）22rod,clampingstrapMax.oilpressure35MPaClampingforce13.7kN25StandardclampingstrapM24threadMax.recommendedtorque383NmMax.clampingforce40kNHydraulicswingclamp6951FN-33-21（page71,metriccatalogue）38rod,clampingstrapMax.oilpressure35MPaClampingforce35kNForcecomparison26StandardclampingstrapM24threadMax.recommendedtorque383NmMax.clampingforce40kNHollowpistoncylinder6921-100x10（page26,metriccatalogue）M24threadMax.oilpressure400barClampingforce101kNForcecomparison27MechanicalorHydraulic?

28MechanicalorHydraulic?

50MPaSequenceValve47-0440-02（J-3）Setat30MPaCartridgeMountCylinder（x8）42-1010-04（pageF-12）2.5kNeach50MPaThreadedCylinder42-0010-06（pageF-4）3.4kN30MPa5.7kN50MPa29Forcediagram30MPa50MPaSequencevalveopensWorkpiecesMovementofcylinderOilpressure30Component&FixturedesignSENSIBLEUSEOFFORCESensibleintroductionofpositioning,clampingandsupportingforceswillenhancethequalityofaworkpiece31Oilsupplytofixturesn2basicmethodsnthroughpipesnthroughgundrilledchannelsnMethoddependsonncosttargetncomplexityoffixturenproductsbeingused32Oilsupplytofixtures,costcomparisonnA:

ThroughpipesusingflangetypeclampsnB:

ThroughpipesusingthreadedtypeclampsnC:

Throughgundrilledchannels&manifoldmountedtypeclampsnD:

Throughgundrilledchannels&threadedbodytypeclamps33Oilsupplytofixtures,costcomparisonA:

ThroughpipesusingflangetypeclampsnRelativelyeasytomanufacturenFittingsweakestpartofsystemnChiptrapsControlfixtureCOST100%34Oilsupplytofixtures,costcomparisonB:

ThroughpipesusingthreadedtypeclampsnLessswarftrapsnReducesmachiningareanFittingsweakestpartofsystemCOST?

%againstcontrolfixture35Oilsupplytofixtures,costcomparisonC:

Throughgundrilledchannels&manifoldmountedtypeclampsnMaximumcomponentdensitynMinimumswarftrapsCOST?

%againstcontrolfixture36Oilsupplytofixtures,costcomparisonD:

Throughgundrilledchannels&threadedbodytypeclampsnMaximumcomponentdensitynMinimumswarftrapsCOST?

%againstcontrolfixture37Oilsupplytofixtures,costcomparisonC:

Throughgundrilledchannels&manifoldmountedtypeclamps98%B:

130%D:

104%A:

100%Hydrauliccircuitdesign39Circuitdesign40CamCoverfixtureexample41Circuitdesign42http:

/www.ec-fixtureexample44Circuitdesign45Gettingtheoiltothefixture47Rotary&RotaryValveCouplings48RotaryCouplingsnUsedwhenfreepassageofoilisrequiredtobedistributedonrotarytablearrangementsnStandardversionsofsingle,twin,fourandsixpassageswith/withoutleakageportnMaximumoperatingpressure250/500barnWhenspecifyingincludedataonrotationspeed,pressure,temperature,mediaandcycletimenSpecialdesignsavailableonrequest49TwinpassagerotarycouplingnUseonrotarytablewithtwosingleactingcylinders50FourpassagerotarycouplingnUseonrotarytabl