資源描述：
《數(shù)控機(jī)床改造-畢業(yè)設(shè)計外文翻譯》由會員上傳分享，免費在線閱讀，更多相關(guān)內(nèi)容在學(xué)術(shù)論文-天天文庫。
1、TheNumericalControlEngineBedTransformsHarveyB.MackeyFirstnumericalcontrolsystemdevelopmentsummarybriefhistoryandtendencyIn1946thefirstelectronicaccountingmachinewasbornintheworld,thisindicatedthehumanitycreatedhasbeenpossibletostrengthenandpartiallytoreplacethementallaborthetool.Itwi
2、ththehumanitythesewhichintheagriculture,theindustrysocietycreatedonlyisstrengthensthephysicallaborthetooltocompare,gotupthequantitiveleap,enteredtheinformationsocietyforthehumanitytolaythefoundation.After6years,in1952,computertechnologyappliedtotheenginebed,thefirstnumericalcontrolen
3、ginebedwereborninUS.Fromthistimeon,thetraditionalenginebedhashadthearcherytargetchange.Sincenearlyhalfcentury,thenumericalcontrolsystemhasexperiencedtwostagesandsixgenerationofdevelopment.1.1Numericalcontrol(NC)stage(1952~1970)Theearlycomputeroperatingspeedislow,wasnotbigtothenscienc
4、ecomputationandthedataprocessinginfluence,butcouldnotadapttheenginebedreal-timecontrolrequest.Thepeoplecannotbutusenumerallogiccircuit"tobuild"tobecomeanenginebedspecialpurposecomputertotakethenumericalcontrolsystem,iscalledthehardwareconnectionnumericalcontrol(HARD-WIREDNC),JianChen
5、gweinumericalcontrol(NC).Alongwiththeprimarydevicedevelopment,thisstagehashadbeenthroughrepeatedlythreegenerations,namely1952firstgenerationof--electrontube;1959secondgenerationof--transistor;1965thirdgeneration--smallscaleintegrationelectriccircuit.第21頁1.2Computernumericalcontrol(CN
6、C)stage(in1970~present)In1970,thegeneralminicomputeralreadyappearedandthemassproduction.Thereupontransplantsittakesthenumericalcontrolsystemthecorepart,fromthistimeonenteredthecomputernumericalcontrol(CNC)thestage("whichshouldhavecomputerinfrontofthegeneral"twocharacterstoabbreviate)
7、.In1971,AmericanINTELCorporationintheworldfirsttimethecomputertwomostcorespart--logicunitsandthecontroller,usedthelargescaleintegratedcircuittechnologyintegrationontogetherthechip,calleditthemicroprocessor(MICROPROCESSOR),alsomightbecalledthecentralprocessingelement(tobecalledCPU).Th
8、emicroproces
