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1、桂林电子科技大学毕业设计论文英文翻译资料CNCmachinetools,CNCengravingmachineoverviewHistoryofthedevelopmentofCNCmachinetoolsandnecessity:halfacentury,CNCsystemhasgonethroughtwostages,sixgenerationsofdevelopment.Hard-lineCNCphase(1952to1970).Theinitialcomputerprocessingspee
2、disrelativelylowbecause,forreal-timecontrolofmachine-widefashion.So,peoplehavetousedigitallogiccircuits,"ride"intoadedicatedcomputerasnumericalcontrolmachinetoolsystem,knownasthehard-linenumericalcontrol(HardwiredNumericalControl),referredtoasNC(NC).Wi
3、ththedevelopmentofcomponents,thisstageofdevelopmentthroughthreegenerations,beginningin1952thatthefirstgenerationofnumericalcontrolsystem,itsmainfeatureisthetubes,relays,analogcircuitelementsbased;thesecondgenerationin1959,CNCItsmainfeatureisatransistor
4、-baseddigitalcircuitelements;1965,thethirdgenerationCNCsystem,itsmainfeaturesistheintegrateddigitalcircuitdevicesbased.Computernumericalcontrolphase(1970-present).1970thefourthgenerationCNCsystem,itsmainfeatureisasmallcomputer-basedandsmall-scaleintegr
5、atedcircuitsusingCNC;1974,thefifthgenerationofnumericalcontrolsystem,itsmainfeaturesarebasedonmicroprocessorandadigitaldisplay,faultself-diagnosticfunctionnumericalcontrolsystems;1990,thesixthgenerationofnumericalcontrolsystem,whichischaracterizedbyaPC
6、-basedCNCsystem,nowwidelyusedtoenterthestage,thepriceisrelativelymuchlower,andforsomelarge-scaleequipment,thehigh-precision,versatile,easytooperate,developsimple,easyandsothepriceisveryhigh,andsomecanreachmillionsoreventhousandsofyuan.Theneedforthedeve
7、lopmentofCNCmachinetools:(1):WorldWarIIreflectedthedemandsofmoresophisticatedweaponsandequipment;computertechnologygenerationandcontinuousdevelopment;machinetechnologycontinuestoevolveandmatureandsoon.(2):WorldWarIIreflectedthedemandsofmoresophisticate
8、dweaponsandequipment;computertechnologygenerationandcontinuousdevelopment;machinetechnologycontinuestoevolveandmatureandsoon.CNCfeatures:DigitalcontrolmachinetoolCNCmachinetoolsisshort,isaprocesscontrolsystemwithautomatedmachinetools.Th
