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1、Unit1TheApplicationsofNC/CNC MachiningTechnologyLesson1TheApplicationsofC/CNC1.1Lesson2DefinitionofCNCMachines1.2ReadingMaterials1CNCMachiningCenters1.3ReadingMaterials2ClassificationofCNCMachines1.41.1Lesson1TheApplicationsofC/CNCNCtechnologyhasbeenu
2、sedinindustryforover40years.Simplyspeaking,numericalcontrolisamethodofautomaticallyoperatingamanufacturingmachinebasedonacodeofletters,numbers,andspecialcharacters.Acompletesetofcodedinstructionsforexecutinganoperationiscalledaprogram.[1]Theprogramist
3、ranslatedintocorrespondingelectricalsignalsforinputtingtomotorswhichrunthemachine.Numericalcontrolmachinescanbeprogrammedmanually.Ifacomputerisusedtocreateaprogram,theprocessisknownascomputer-aidedprogramming.NCtechnologyhasfoundmanyapplications,inclu
4、dinglathes,andturningcenters,millingmachinesandmachiningcenters,punches,electricaldischargemachines(EDM),flamecutters,grinders,andtestingandinspectionequipments.ThemostcomplexCNCmachinetoolsaretheturningcenterwithaten-stationturretthatacceptsquick-cha
5、ngetools,theverticalmachiningcenterthatthetoolmagazineisontheleftofthemachineandhorizontalmachiningcenterequippedwithanautomatictoolchanger,showninFigure1-1andFigure1-2respectively.Generallyspeaking,toolmagazinescanstore200cuttingtools.1.2Lesson2Defin
6、itionofCNCMachinesAcomputernumericalcontrol(CNC)machineisanNCmachinewiththeaddedfeatureofanon-boardcomputer.Theon-boardcomputerisoftenreferredtoasthemachinecontro1unitorMCU.ControlunitsforNCmachinesareusuallyhardwired.Thismeansthatthemachinefunctionsa
7、recontrolledbythephysicalelectronicelementsthatarebuiltintothecontroller[1].Theon-boardcomputer,ontheotherhand,is“soft”wired.Thus,themachinefunctionsareencodedintothecomputeratthetimeofmanufacture.TheywillnotbeerasedwhentheCNCmachineisturnedoff．Comput
8、ermemorythatholdssuchinformationisknownasROMorread-onlymemory.TheMCUusuallyhasanalphanumerickeyboardfordirectormanualdatainput(MDI)ofpartprograms.SuchprogramsarestoredinRAMortherandom-accessmemoryportionofthecomputer．Theycanbeplayedback，edited
