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1、MachinetoolnumericalcontrolreformsFirst,CNCsystemsandthedevelopmenttrendofhistory1946birthoftheworld'sfirstelectroniccomputer,whichshowsthathumanbeingscreatedtoenhanceandreplacesomeofthementalworktools.Itandhumanagriculture,industrialsocietyinthecreationofthosewhomerelyincr
2、easecomparedtomanualtools,fromaqualitativeleapformankind'sentryintotheinformationsocietylaidthefoundation.Sixyearslater,in1952,computertechnologyappliedtothemachineintheUnitedStateswasbornfirstCNCmachinetools.Sincethen,thetraditionalmachineproducedaqualitativechange.Nearlyh
3、alfacenturysincetheCNCsystemhasexperiencedtwophasesandsixgenerationsofdevelopment.1.1,NumericalControl(NC)phase(1952to1970)Earlycomputer'scomputationalspeedlowandtheprevailingscientificcomputinganddataprocessingisnotaffected,butcannotmeettherequirementsofreal-timecontrolmac
4、hine.Peoplehavetousedigitallogiccircuit"tied"intoasinglemachineasadedicatedcomputernumericalcontrolsystem,knownasthehardwareconnectionNC(HARD-WIREDNC),calledtheNumericalControl(NC).Withthedevelopmentofcomponentsofthisphaseafterthreegenerations,thatis,in1952thefirstgeneratio
5、n-tube;1959ofthesecondgeneration-transistor;1965ofthethirdgeneration-small-scaleintegratedcircuits.1.2,ComputerNumericalControl(CNC)phase(1970topresent)To1970,GMhasbeenasmallcomputerandmass-produced.SoittransplantsystemasthecorecomponentofNC,haveenteredaComputerNumericalCon
6、trol(CNC)stage(infrontofthecomputershouldbe"universal"wordomitted).To1971,theUnitedStatesINTELcompanyintheworldwillbethefirsttimethetwomostcorecomputercomponents-computingandcontroller,alarge-scaleintegratedcircuittechnologyintegrationinachip,calledthemicroprocessor(MICROPR
7、OCESSOR),alsoknownasthecentralprocessingunit(CPU).1974microprocessortobeusedinCNCsystem.Thisisbecausethefunctionofthecomputeristoosmalltocontrolamachinetoolcapacityaffluent(thetimehasbeenusedtocontrolmorethanonemachine,calledGroupControl),asareasonableeconomicuseofthemicrop
8、rocessor.Minicomputerreliabilityandthennotideal.Earlymicroprocessorspeedandfunctio
