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1、江汉大学机建学院2011年毕业论文-----------外文翻译TheNumericalControlEngineBedTransformsHarveyB.MackeyFirstnumericalcontrolsystemdevelopmentsummarybriefhistoryandtendencyIn1946thefirstelectronicaccountingmachinewasbornintheworld,thisindicatedthehumanitycreatedhasbeenpossibletostren
2、gthenandpartiallytoreplacethementallaborthetool.Itwiththehumanitythesewhichintheagriculture,theindustrysocietycreatedonlyisstrengthensthephysicallaborthetooltocompare,gotupthequantitiveleap,enteredtheinformationsocietyforthehumanitytolaythefoundation.After6years,i
3、n1952,computertechnologyappliedtotheenginebed,thefirstnumericalcontrolenginebedwereborninUS.Fromthistimeon,thetraditionalenginebedhashadthearcherytargetchange.Sincenearlyhalfcentury,thenumericalcontrolsystemhasexperiencedtwostagesandsixgenerationofdevelopment.1.1N
4、umericalcontrol(NC)stage(1952~1970)Theearlycomputeroperatingspeedislow,wasnotbigtothensciencecomputationandthedataprocessinginfluence,butcouldnotadapttheenginebedreal-timecontrolrequest.Thepeoplecannotbutusenumerallogiccircuit"tobuild"tobecomeanenginebedspecialpur
5、posecomputertotakethenumericalcontrolsystem,iscalledthehardwareconnectionnumericalcontrol(HARD-WIREDNC),JianChengweinumericalcontrol(NC).Alongwiththeprimarydevicedevelopment,thisstagehashadbeenthrough第23页江汉大学机建学院2011年毕业论文-----------外文翻译repeatedlythreegenerations,n
6、amely1952firstgenerationof--electrontube;1959secondgenerationof--transistor;1965thirdgeneration--smallscaleintegrationelectriccircuit.1.2Computernumericalcontrol(CNC)stage(in1970~present)In1970,thegeneralminicomputeralreadyappearedandthemassproduction.Thereupontra
7、nsplantsittakesthenumericalcontrolsystemthecorepart,fromthistimeonenteredthecomputernumericalcontrol(CNC)thestage("whichshouldhavecomputerinfrontofthegeneral"twocharacterstoabbreviate).In1971,AmericanINTELCorporationintheworldfirsttimethecomputertwomostcorespart--
8、logicunitsandthecontroller,usedthelargescaleintegratedcircuittechnologyintegrationontogetherthechip,calleditthemicroprocessor(MICROPROCESSOR),alsomightb
