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1、毕业设计中英文翻译学生姓名：学号：学院：机械设计制造及其自动化专业：指导教师：2013年5月原文：48.4.4AutonomousandIntelligentMachineToolThewholemachiningoperationofconventionalCNCmachinetoolsispredeterminedbyNCprograms.Oncethecuttingconditions,suchasdepthofcutandstepover,aregivenbythemachiningcommandsintheNCprograms,t
2、heyarenotgenerallyallowedtobechangedduringmachiningoperations.ThereforeNCprogramsmustbeadequatelypreparedandverifiedinadvance,whichrequiresextensiveamountsoftimeandeffort.Moreover,NCprogramswithfixedcommandsarenotresponsivetounpredictablechanges,suchasjobdelay,jobinsertion
3、,andmachinebreakdownfoundonmachiningshopfloors.ShiraseproposedanewarchitecturetocontrolthecuttingprocessautonomouslywithoutNCprograms.Figure48.29showstheconceptualstructureofautonomousandintelligentmachinetools(AIMac).AIMacconsistsoffourfunctionalmodulescalledmanagement,st
4、rategy,prediction,andobservation.Allfunctionalmodulesareconnectedwitheachothertosharecuttinginformation.Fig.48.29ConceptualstructureofAIMacDigitalCopyMillingforReal-TimeTool-PathGenerationAtechniquecalleddigitalcopymillinghasbeendevelopedtocontrolaCNCmachinetooldirectly.Th
5、edigitalcopymillingsystemcangeneratetoolpathsinrealtimebasedontheprincipleoftraditionalcopymilling.Indigitalcopymilling,atracingprobeandamastermodelintraditionalcopymillingarerepresentedbythree-dimensional(3-D)virtualmodelsinacomputer.Avirtualtracingprobeissimulatedtofollo
6、wavirtualmastermodel,andcutterlocationsaregenerateddynamicallyaccordingtothemotionofthevirtualtracingprobeinrealtime.Inthedigitalcopymilling,cutterlocationsaregeneratedautonomously,andanNCmachinetoolcanbeinstructedtoperformmillingoperationwithoutNCprograms.Additionally,not
7、onlystepover,butalsoradialandaxialdepthsofcutcanbemodified,asshowninFig.48.30.Also,digitalcopymillingcangeneratenewtoolpathstoavoidcuttingproblemsandchangethemachiningsequenceduringoperation[48.12].Furthermore,thecapabilityforin-processcuttingparametersmodificationwasdemon
8、strated,asshowninFig.48.31[48.13].Real-timetool-pathgenerationandthemonitoredactualmillin
