车床刀具早期的发展.doc

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1、鸫山噜撬区搴芹峭丝们摹鹄筲TheEarlyDevelopmentOfNumericallyControlledMachineTools别贺褶吸软钧喃镑剥绺事速鼓ThehighlysophisticatedCNCmachinetoolsoftoday,inthevastanddiverserangefoundthroughoutthefieldofmanufacturingprocessing,startedfromveryhumblebeginningsinanumberofthemajorind

2、ustrializedcountries.SomeoftheearliestresearchanddevelopmentworkinthisfieldwascompletedinUSAandamentionwillbemadeoftheUK'scontributiontothisnumericalcontroldevelopment.补壤见猝洪娑书吟砧笾执务嫜AmajorproblemoccurredjustaftertheSecondWorldWar,inthatprogressinallare

3、asofmilitaryandcommercialdevelopmenthadbeensorapidthatthelevelsofautomationandaccuracyrequiredbythemodernindustrializedworldcouldnotbeattainedfromthelabourintensivemachinesinuseatthattime.Thequestionwashowtoovercomethedisadvantagesofconventionalplanta

4、ndcurrentmanninglevels.Itisgenerallyackonwledgedthattheearliestworkintonumericalcontrolwasthestudycommissionedin1947bytheUSgovernment.Thestudy'sconclusionwasthatthemetalcuttingindustrythroughouttheentirecountrycouldnotcopywiththedemandsoftheAmericanAi

5、rForce,letalonetherestofindustry!Asadirectresultofthesurvey,theUSAirForcecontractedthePersonsCorporationtoseeiftheycoulddevelopaflexible,dynamic,manufacturingsystemwhichwouldmaximizeproductivity.TheMassachusettsInstituteofTechnology(MIT)wassub-contrac

6、tedintothisresearchanddevelopmentbytheParsonsCorporation,duringtheperiod1949-1951,andjointlytheydevelopedthefirstcontrolsystemwhichcouldbeadaptedtoawiderangeofmachinetools.TheCincinnatiMachineToolCompanyconvertedoneoftheirstandard28inch"Hydro-Tel"mill

7、ingmachinesorathree-axisautomaticmillingmadeuseofaservo-mechanismforthedrivesystemontheaxes.Thismachinemadeuseofaservomechanismforthedrivesystemontheaxes,whichcontrolledthetablepositioning,cross-slideandspindlehead.Themachinecabbeclassifiedasthefirstt

8、rulythreeaxiscontinuouspathmachinetoolanditwasabletogeneratearequiredshape,orcurve,bysimultaneousslidewaymotions,ifnecessary.翠霆堇拦么韭肯奠畔漭铞睽浏AtaboutthesametimesastheseAmericanadvancesinmachinetoolcontrolweretakingPlace,AlfredHerbertLimitedintheUn