机械外文翻译-数控机床开环控制系统.doc
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英文文献翻译:
原文:
TheopensystemmeritofComputerNumericalControl
Theopensystemmeritisthesystemsimple,thecostlow,buttheshortcomingistheprecisionislow.Thereversegap,theguidescrewpitcherror,stopinferiorlycanaffectthepointingaccuracybymistake.Followingseveralkindofimprovementsmeasuremaycausethepointingaccuracydistinctimprovement.
1.reversegaperrorcompensates
Thenumericalcontrolenginebedprocessingcuttingtoolandtheworkpiecerelativemotionisdependsuponthedriveimpetusgear,theguidescrewrotation,thustheimpetusworkfloorandsoonmovestheparttoproducemovesrealizes.Astraditionalpartgear,guidescrewalthoughthemanufactureprecisionisveryhigh,butalwaysunavoidablyhasthegap.Asaresultofthiskindofgapexistence,whenmovementdirectionchange,startsthesectiontimetobeabletocauseinevitablyactuatesthepartwastingtime,appearstheinstructionpulsetopushthemotionlessfunctionalelementtheaspect.Thishasaffectedtheenginebedprocessingprecision,namelytheinstructionpulseandactualentersforthestepdoesnottally,hastheprocessingerrortherefore,thesplit-ringnumericalcontrolsystemallestablishesgenerallyhasthereversegaperrorcompensatoryfunction,withbymakesupwhichwastestimethestepreversegapdifferencecompensatesisfirstactualreverseentersfortheerror,convertsthepulseequivalentnumberit,compensatesthesubroutineasthegaptheoutput,whenthecomputerjudgmentappearswheninstructionforcountermotion,transfersthegaptocompensatethesubroutineimmediately,compensatesthepulseaftertheoutputtoeliminatethereversegaptocarryonagainnormallyinsertsmakesupthemovement.
2.oftenthevaluesystematiccharacteristicpositionerrorcompensates
Akindofstorehousebytransfersforthedesigner.Likethisinthecomponentsdesignstage,thedesigneronlymustinputthecharacteristictheparameter,thesystemdirectproductioncharacteristicexamplemodel:
Wemustsavetherelatedcharacteristicclassinthedatabasethestructureinformation,thedatabasetablecollectionareuseinsavingthispartofrelatedinformation.Accordingtothecharacteristictypedefinitionneed,wedefinedthecharacteristicclasscodetable,thecharacteristicclasseditioninformationhaveoutstandingshownthecharacteristictype;Definedthecharacteristicclassstructureoutstandingtoreachthecharacteristicclassthestructure;Andrelatesthroughthecomponentscharacteristicdispositiontableandthecomponentscharacteristiclevelinformation.Thecharacteristicleveldatasheetcollectionisthiscomponentsmodeldatabasedesigncore,hasrecordedcharacteristicexampleinformationandsoonmodeldesign,craft.Thecharacteristicstructuretablehasrecordedthecharacteristicgeometrystructure;Thecharacteristicsizetable,thecharacteristicshapepositiontableoflimits,thecharacteristicsurfaceroughnesstablehasrecordedthecharacteristicprojectsemanticsquotation;Thesizetable,theshapepositiontableoflimits,thesurfaceroughnesstablesavedallcomponentscharacteristicdatamessage.Inthecharacteristiclevel,usingcharacteristicID,geometryprincipallinkageandsoonessentialfactorID,sizeID,commondifferenceID,roughnessIDcarriesonthedataretrieval.WeapplythiscomponentsinformationmodeldatabaseunderthefactoryenvironmentsomemoduleCADintheAMintegrativesystem,hasrealizedCADandtheCAPPcharacteristicinformationsharingwell.Mainuseready-madeCAD/theCAMsoftware(Unigraphics1I)carriesontheproductdesignandtheNCprogramminginthissystem,andthroughcarriesontwotimesofdevelopmentsgainscomponentstothissoftwarethesizeinformation;Atthesametimeusesthedialoguewindowwhichdevelopsvoluntarily,letsdesignthepersonneltoinputothercharacteristicinformationalternately,realizesthissoftwareandthesystemsharingdatabaseconnection.Whenassistancetechnologicaldesign,thetechnologicaldesignpersonnelthroughtheprocedureinquiryfunction,inquiresthecomponentsinformationfromthesharingdatabasewhichneeds,carriesontheinteractivetechnologicaldesign.ThushasfacilitatedtheCAPPcomponentsinformationacquisition,enhancedthetechnologicaldesignefficiency.WhencarriesontheNCprogrammingusingUG,mayfromthesharingdatabasegainthecraftandthemanufactureinformationwhichneeds,carriesonvariousworkingprocedurestheknifeaxledesignandtheprocessingsimulationestablishesanabsolutezerospotonthenumericalcontrolenginebed,theactualvariouscoordinateaxessyzygycompletelypositionerror,makesthecurveinordertodeterminedcompensatesthespot.Attemptsltoshowisanactualpositionerrorcurve,(error)carriesonthiscurvey-coordinatetakethepulseequivalentastheunitthedivision,makesth