并联机床中工件安装定位系统的开发外文文献翻译中英文翻译外文翻译.docx

并联机床中工件安装定位系统的开发外文文献翻译中英文翻译外文翻译.docx

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并联机床中工件安装定位系统的开发外文文献翻译中英文翻译外文翻译

DevelopmentofaWorkpieceLocationDeterminationSysteminParallelMechanismTypeMachineTools

ZHAOXiaoming,SHAOHua,　HATTORIKazuya,　TSUTSUMIMasaomi

SchoolofMechanicalEng,ShanghaiJiaotongUniv,Shanghai200030,China;

TechnicalResearchDept,ToyodaMachineWorks,Kariya44828652,Japan;

BioApplicationsandSystemsEng,TokyoUnivofAgricultureandTechnology,

Tokyo18428858,Japan.

Abstract:

ThispaperusesHexaMmadebyToyodaMachineWorksCo.asananalyticalmodelofparallel

mechanismtypemachinetools.Muchcollisionmaybegeneratedforitscomplicated

structureandworkingspace,whenaworkpieceismachinedusingthismachine.For

example,thosecollisionsaregenerated.betweenthemovingcomponentsoftheparallel

mechanism,betweenthemovingcomponentsandaworkpieceandbetweenthemoving

componentsandthetoolstorageforautomaticchanging.Inthispaper,analgorithm

fordetectingandavoidingthosecollisionswasproposed.Themethodforavoidingthe

collisionswasconductedbyreadjustingthelocationoftheworkpiecewithoutamending

thetoolpath.Itisconfirmedthroughexperimentthattheproposedalgorithmis

usefulfordetectingthecollisionsanddeterminingthelocationoftheworkpieceprior

totheactualmachining.

Keywords:

parallelmachinetools;ollisioncheck;avoidance;toolpath;installationsite

Inrecentyears,thePMTdevelopmentandapplicationofthegrowing,butbecauseofitsstructureandworkingspaceisverycomplicated,useitforprocessingtheworkpiece,itisverypossiblethemachinecomponentsthemselvesinterferewiththeworkpieceandthemachineinterference.Also,iflikePMTHexaM[1],workonstageintheinstallationofautomatictoolchangedevicesandotherperipheralequipment,theinstallationoftheworkpiece.Itmaylimittheinstallationoftheworkpiecelocation,thatis,peripheralequipmentandworkpieceinterferencethatmayarisewhenprocessingmachinesandperipheralequipmenttointerfere.

PMTontheirwaytocheckinterferenceandmachineworkspacehasbeenmuchresearch[2~5].Amongthem,ThiswriterandotherJapanesecompaniesToyotaMachineWorksofPMTHexaM[1]asamodel.DiscussionofPMTstheirinterferenceintheinspection,theworkspaceapproximateexpression[5].theotherhand,5-axisNCmachining,cuttingtool（knife,ChuckandSpindle）andtheworkpiece（workpieceandfixture）interferencemethodsalsohavemany.Amongthem,Takeuchi,etc.[6]toolsystemfromthesurfaceforanumberofpointsasinterferencechecking,andtheworkpiecesurfacearerelativelysimplefunction,wheninterferencecheckpointattheinternalfunctions,beabletojudgeforthemachineandworkpieceoccurredinterference;Theauthor,etc.[7]andthemethodproposedherejusttheopposite.thatis,fromtheworkpiecesurface,systemselectioninterferencechecking,whetherthesystemaccesstoolforinterferencechecking.AsCNCmachineperipheraldevicesarenotgenerallyplacedintheworktops,So,inthesetwomethods,theydidnotconsiderprocessingmachinesandperipheralequipmenttointerfereintheissue.

ThesestudiesarediscussedindetailPMTtheirinterferenceinthemachinetoolandworkpieceandtheinterferencecheckingandevasivemethods,However,theuseofPMTago,butthereareseveralproblems:

①workingplatformforperipheraldevicessuchasabarrierMachine[1]shouldconsiderthemachinesandperipheralequipmentpossibleinterference;

②theinspectionmachineandtheinterferenceoftheworkpiece.Considerationshouldalsobegivenspindleplywood,plywoodhingelinkwiththeworkpieceandthepossibilityofinterference,However,theexistingCAMsoftwaredoesnotincludesuchinterferencedetection;

③machinewhenthereisinterferencewiththeworkpiece.GeneralToolalwaysposturaladjustmentstoavoidinterference.Infact,PMT,inadditiontoposturaladjustmenttool,Youcanalsoadjustthelocationoftheworkpiecetoavoidallinterference.Moreover,ThisapproachavoidedthebiggestadvantageisnottochangetheexistingCAMsoftware.

BasedoncommonCAMsoftwaretoolpathoftheoutput-based,shortenthetimetointerfereintheinspectioncheckpointsdocumentcomposition,Byadjustingthelocationoftheinstallationoftheworkpiecetoavoidthepossibilityofallkindsofinterference,oftheworkpiececantestforprocessingattheworkpieceandmachinabilitybestinstallationlocationcalculation.

1.Interferencecheckingandavoidinterference

UsingthePMTHexaM,peripheralequipment（theknife）andtheworkpieceinstallationdiagramshowninFigure1.Therefore,Forthemachine,duringprocessingandinstallationoftheworkpieceatthepossibilityofinterferencewithhisinterference,machinetoolandworkpieceinterferencemachinesandtheperipheralequipment,andinterferencewiththesurroundingdevicesworkpieceinterference.

Ifyouareusingaparallelmachinetablewithoutperipheraldevicesordevicesplacedaroundthefarmore,willnotaffectthelocationoftheworkpiecemachiningprocessortherewillnotbemachinesandperipheralequipmentinterference,canbeomittedfromtheworkpieceandthemachineandequipmentaroundtheinterferencechecking.

Fig.1　SchematicoftheparallelmechanismHexaM

1.1Theirinterference

1.1.1ThecompositioncheckpointsDuringprocessing,Alltoolscanbeappliedtopositionliterature[5]describedmethodtocheckwhethertheirinterventionwillhappen.ifthereisinterference,canbeusedintheadjustmentoftheworkpiecelocationtoavoidinterference.Partsoftheinstallationlocationchanges,ProcessingToolpositionwillnaturallybechanged.Therefore,theneedtoconductanotherinspection,notoccuruntilthedatetheirinterference.Asaninstallationateachlocationtolocationofallthetoolsforinspectioncomputingtimewillbeverylong.Toshortenthetimeofcalculation,thisisnottherighttoolforalllocationsandtoextractonlyasmallnumberofkniveslocation（hereinafterreferredtoascheckpoints）interferencechecking.Therefore,pointoutchecksmustbedone:

atcheckpointsifnointerferenceinitsown.intheothercutterlocationwouldnotinterfereintheiroccurrence.settingupcheck-pointsadvantageofasignificantreductioninthefrequencyofinspections.

Fromthez-axiscutterfarther,thehighertheposition,thegreaterthedegreeoftilt,themorepronetheyinterferein[5].Therefore,waitfortheprocessingoftheworkpiece,thetoolpathfromtheoutsidetosharethemeasurementpoint,thehigherthecutterlocation,tooltiltanglelargerpointastodeterminewhethertheyinterfereinthecheckpoints.

1.1.2InterferewiththeinspectionmethodsToolpositionandposturestraightatthemoonandthespacerotarydiskspace,itwouldbeinterferenceinitsown[5].Therefore,theyinterferewiththeinspectionmethods:

①readallcheckpoints,obtainedacheckpointeachcorrespondingtothestraightandrotatingspaceYuanYuanspace[5].②cutterpositionandpostureinresponseThestraightroundspaceandspaceRotaryCircle,convictedofthecheckpointwillnotinterfereintheiroccurrence;Inallthecheckpointsarenotinterfered,werejudgedtobeinstalledinthepositionnottointerfereintheiroccurrence.③IfacheckpointinthelocationorpositionofthestraightexcessspaceYuanYuan,orrotatingspace,canbeusedintheliterature[5]mentionedintheinspectionmethodstointerfereinthereview.Asspacethantheaverageroundofinspectionsinterference[5]calculationtobemuchsmaller,sothiskindofmethodcanshorteneachinspection,thecomputationtime.

1.1.3AvoidinterferencemethodAsinthesamehorizontalplane,thecutterinthez-axislocationattheleastpronetohisinterference.Therefore,Ifacheckpointinaself-interferencethenwecheckpointsandthez-axisdirectionconnectivityasevasive.Then,Partsoftheinstallationlocationalongthedirectionofmovementofevading10mm.Iftwoconsecutiveevadedirectionoftheangleisgreaterthan150°.thatcouldhavebeenavoidedreverseddirectioninthehorizontalplanedoesnotexistinthelocationtoinstall,soTheworkpiececanbeinstalledtoenhanceupwardposition.Inthispaper,eachincreaseby10mm.IftheyinterferewiththemainmotorisarotaryscrewlowerinterferenceNoteworkpieceistoohighorthelocationoftheworkpiecetoohigh,notwiththemachinetool.

1.2Machineinterferewiththeworkpiece

1.2.1ThecompositioncheckpointsAsshowninfigure2,machineandworkpiecepossibleinterferencebetweenpartsofaknife,chuck,spindlehead,spindlesplint,Hingesandplywoodlink.workpiececanbeseenfromthesurfaceandsurfacecomposition.Amongthem,Surfaceprocessingfromthepointwithmachinemighthappentothenon-interferencebynon-machinedsurfaceprocessingpointis,here,processingandpointandnon-pointprocessingcollectivelyreferredinquiriestothepoint.

Fig.2　Checkmethodofthecollisionbetweentheparallelmechanismandworkpiece

Inquiriespointwithknives,andChuck,Thefirstspindleaxisandthesplintinterferenceknownasacategoryinterference.Suchinterferenceonlywithknives,theposture,andworkpiecepositionunrelatedtotheinstallation.Therefore,ifthescreeningofsuchinterference,andonlyposturaladjustmenttoolforevasive,ThisrequireschangesCAMsoftware,beyondthescopeofthisdiscussion.

Inquiriespointsplinthingeconnectingrodorinterfereintheresolutionasinterferenceintwocategories.Suchinterferencecanbeadjustedthroughtheinstallationoftheworkpiece-Purchaseavoided.Belowthesetwotypesofinterventiononthecheckpointsformed.