外文资料--10Numerically controlled machines.pdf外文资料--10Numerically controlled machines.pdf

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12720NUMERICALLYCONTROLLEDMACHINESAUTOMATICLATHESHAVEBEENINUSEFORALONGTIME,ANDAREMOSTLYUSEDFORTHERAPIDPRODUCTIONOFLARGENUMBERSOFIDENTICALCOMPONENTSAMORERECENTDEVELOPMENTHASBEENTHEUSEOFNUMERICALLYCONTROLLEDMACHINESFORTHEPRODUCTIONOFSMALLBATCHESOFCOMPONENTSTHESEMACHINESNEEDNOTBERESETEACHTIMEANEWCOMPONENTHASTOBEPRODUCEDAUTOMATICLATHESSINGLEANDMULTISPINDLEAUTOMATICLATHESHAVEBEENFOUNDTOBEMOSTUSEFULFORTHEMANUFACTUREOFLARGENUMBERSOFIDENTICALCOMPONENTSTHEMATERIALUSEDISUSUALLYINTHEFORMOFMETALRODS,WHICHAREFEDINTHROUGHTHEHOLLOWSPINDLESOFTHELATHESMECHANICALDEVICESLIKECAMSANDSTOPSAREUSEDTOCARRYOUTASERIESOFOPERATIONSACCORDINGTO2IPREDETERMINEDPROGRAMTHESETTINGUPTIMEISUSUALLYLONG,ANDSUCHLATHESAREUSUALLYUNSUITABLEFORSMALLBATCHPRODUCTIONCOMPUTERNUMERICALCONTROLMOSTCOMPONENTSREQUIREDBYINDUSTRYNEEDTOBEPRODUCEDONLYINSMALLANDMEDIUMSIZEDBATCHES,ANDTHEIRPRODUCTIONDOESNOTJUSTIFYTHEUSEOFAUTOMATICLATHESINTHEPAST,THEPRODUCTIONOFSMALLANDMEDIUMSIZEDBATCHESWASACHIEVEDBYTHEUSEOFCONVENTIONALMACHINETOOLSANDHIGHLYSKILLEDLABOURTHISRESULTEDINALOWMACHINEUTILIZATIONTIME,ALONGWAITINGTIME,ANDAHIGHCOSTOFPRODUCTIONTHEACCURATEPRODUCTIONOFCOMPONENTSACCORDINGTOADEFINITETIMESCHEDULEWASEXTREMELYDIFFICULTASOLUTIONTOTHISPROBLEMWASFOUNDBYTHEDEVELOPMENTOFASYSTEMOFAUTOMATICPRODUCTIONINTHISSYSTEM,THEMACHINEPRODUCESACOMPONENTAUTOMATICALLYINACCORDANCEWITHPREDETERMINEDINSTRUCTIONS,WHICHCANBEEASILYCHANGEDWHENANOTHERCOMPONENTISTOBEMANUFACTUREDTHEUSEOFAPROGRAMMEDCOMPUTERINMACHINETOOLSHASLEDTOTHISTYPEOFAUTOMATIONBEINGCALLEDCOMPUTERNUMERICALCONTROLCNC,INCOMPUTERNUMERICALCONTROL,THEOPERATIONOFAMACHINETOOLISCONTROLLEDBYAPROGRAMRUNONACOMPUTERTHEMACHINETOOLSUSEDINTHISTYPEOFWORKHAVEMOVEMENTSANDDRIVESWHICHAREDIFFERENTFROMTHOSEINCONVENTIONALMACHINETOOLSTHEYHAVEELECTRICALDRIVESWHICHARECONTROLLEDBYACOMPUTERTHE12820NUMERICALLYCONTROLLEDMACHINESMACHINESDONOTNEEDTOBESETUPBYASKILLEDOPERATOR,EACHTIMEANEWTYPEOFCOMPONENTISMADETHEYWORKAUTOMATICALLYUNDERCOMPUTERCONTROL,ANDONLYACHANGEINTHECOMPUTERPROGRAMISREQUIREDTOPRODUCEANEWBATCHOFCOMPONENTSSUCHASYSTEMHASTHEFOLLOWINGADVANTAGES1THEFLEXIBILITYOFTHESYSTEMRESULTSINHIGHMACHINEUTILIZATIONTIMES2DELIVERIESCANBEMADEONTIMEBECAUSEPRODUCTIONISMOREPREDICTABLE3SPECIALTOOLINGEGUSINGJIGSORFIXTURESISNOTREQUIRED4CONSISTENCYINTHEQUALITYOFTHEGOODSPRODUCEDREDUCESINSPECTIONTIMES5NONMACHININGTIMEISREDUCEDDUETOAUTOMATICTOOLCHANGING,AUTOMATICCLAMPING,ETC6DESIGNCHANGESCANBEEASILYMADE,BECAUSEONLYTHEPROGRAMHASTOBECHANGEDTOPRODUCEANEWCOMPONENT7THESKILLOFTHEOPERATORISUNIMPORTANT,BECAUSETHEACCURACYISONLYDEPENDENTONTHEMACHINEANDTHEPROGRAM8ESTIMATIONOFCOSTSISEASIERTHANINPREVIOUSMETHODSOFPRODUCTIONMACHININGANDTURNINGCENTRESTWOMAJORTYPESOFCNCMACHINETOOLSAREMACHININGCENTRESANDTURNINGCENTRES,AMACHININGCENTREISAMACHINEWHICHCANPERFORMMILLING,DRILLING,BORING,REAMING,ANDTAPPINGOPERATIONS,ANDISSIMILARTOAMILLINGMACHINETURNINGCENTRESAREBASICALLYSIMILARTOLATHESINADDITIONTOTHEUSUAL,SHAFT,BAR,ANDCHUCKWORK,OPERATIONSLIKECONTOURMILLING,TAPPING,MAKINGTSLOTSANDKEYWAYS,ETCCANBEDONEBYTURNINGCENTRESTHESEMACHINESHAVEMANYFEATURESWHICHENSUREACCURATEPERFORMANCEANDPRODUCTIVITYOVERLONGPERIODSOFTIMESOMEOFTHEFEATURESARETHEFOLLOWING1THEMACHINESAREOFMASSIVECONSTRUCTIONTHISGIVESTHEMTHESTABILITYNEEDEDTOWITHSTANDLARGECUTTINGFORCES,ANDTHETHERMALEFFECTSCAUSEDBYTHELARGEQUANTITIESOFCHIPSPRODUCED2MINIMIZATIONOFWEARISACHIEVEDBYTHEUSEOFROLLINGCOMPONENTSINSTEADOFSLIDINGCOMPONENTS20NUMERICALLYCONTROLLEDMACHINES1293THESCREWTHREADSOFCONVENTIONALMACHINESAREREPLACEDBYCIRCULATINGBALLSCREWSRIGIDMOUNTINGTECHNIQUESFORBEARINGSANDSCREWSANDALSOPRELOADINGARETECHNIQUESUSEDFOROVERCOMINGBACKLASH4EACHTOOLISHELDINANADAPTOR,ANDSTOREDINADRUM,CHAIN,OROTHERTYPEOFMAGAZINETHECORRECTTOOLFORANOPERATIONISSELECTEDAUTOMATICALLYFROMAMAGAZINE,ANDISUSEDTOREPLACETHEONEALREADYEXISTINGONTHEMACHINE5MEASURINGINSTRUMENTSGIVEACONTINUOUSINDICATIONOFTHEPOSITIONOFTHECUTTINGTOOLTHESEARECOMPAREDWITHTHEDESIREDVALUESBYTHECOMPUTERANDCORRECTEDWHENNECESSARYTHEUSEOFSUCHATECHNIQUEAUTOMATICALLYCOMPENSATESFORTOOLWEARVOCABULARYACCORDANCEACHIEVEADAPTORAUTOMATICBACKLASHBATCHCOMPENSATECONSTRUCTIONCONTINUOUSCONVENTIONALDEVELOPMENTDIFFICULTDRUMESTIMATIONEXISTEXTREMELYFEATUREFLEXIBLEUBEREINSTIMMUNG/LEISTENVAUFNEHMERMAUTOMATISCHADJFLANKENSPIELNMENGE,LOSGROBE/KOMPENSIERENVANIAGE/STANDIGADJHERKOMMLICHADJENTWICKLUNG/SCHWERADJTROMMEL/SCHATZUNG/EXISTIERENVSEHRADVEIGENSCHAFT/BEWEGLICHADJHOLLOWIDENTICALIMPORTANTINDICATIONINSTRUCTIONMACHININGCENTRENUMERICALCONTROLPREDETERMINEPREDICTABLEPREVIOUSRECIRCULATINGSELECTSETTINGUPSLIDINGSTABILITYTURNINGCENTREUTILIZATIONHOHLADJIDENTISCHADJWICHTIGADJANZEIGE/BEFEHLMBEARBEITUNGSZENTRUMNNUMERISCHESTEUERUNG/VORHERBESTIMMENVVORAUSSAGBARADJVORHERADJUMLAUFENDADJAUSWAHLENVEINSTELLUNG/GLEITENDADJSTABILITAT/CNCDREHMASCHINE/NUTZUNG/13020NUMERICALLYCONTROLLEDMACHINESEXERCISESXX1ANSWERTHEFOLLOWINGQUESTIONSAWHATAREAUTOMATICLATHESUSEDFORBHOWWERESMALLBATCHESOFCOMPONENTSPRODUCEDINTHEPASTCWHATWERETHEDISADVANTAGESOFTHEPREVIOUSMETHODSOFPRODUCTIONDHOWISNONMACHININGTIMEREDUCEDINACNCMACHINEEINWHATWAYDOTHEDRIVESINCNCMACHINESDIFFERFROMTHOSEINCONVENTIONALMACHINESFWHYDOESTHEUSEOFCNCRESULTINHIGHMACHINEUTILIZATIONTIMESGWHATARETHECHANGESTHATHAVETOBEMADE,WHENANEWCOMPONENTHASTOBEPRODUCEDUSINGACNCMACHINEHWHYISTHESKILLOFTHEOPERATORUNIMPORTANTINACNCMACHINEIHOWARETOOLSCHANGEDINACNCMACHINEJHOWISTHEWEARONACNCMACHINEMINIMIZED2FILLINTHEGAPSINTHEFOLLOWINGSENTENCESAAUTOMATICLATHESAREFORTHEOFALARGENUMBEROFCOMPONENTSBANEWHASBEENTHEUSEOFCONTROLLEDMACHINESFORPRODUCTIONCPREVIOUSLY,SMALLBATCHPRODUCTIONWASUSINGLABOURANDMACHINETOOLSDTHISRESULTEDINALOWMACHINETIMEANDAHIGHOFPRODUCTIONETHEOFACNCMACHINEISBYACOMPUTERPROGRAMFSPECIALTOOLSLIKEJIGSANDARENOTWHENACNCMACHINEISUSED
编号:201311062134433281    类型:共享资源    大小:223.89KB    格式:PDF    上传时间:2013-11-06
  
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