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1、外文文献翻译ThebasicsofComputerNumericalControlWhilethespecificintentionandapplicationforCNCmachinesvaryfrommachinetypetoanother,allformsofCNChavecommonbenefits.ThoughthethrustofthispresentationistoteachyouCNCusage,ithelpstounderstandwhythesesophisticatedmachineshavebecomesop
2、opular.HerearebutafewofthemoreimportantbenefitsofferedbyCNCequipment.ThefirstbenefitofferedbyallformsofCNCmachinetoolsisimprovedautomation.Theoperatorinterventionrelatedtoproducingworkpiecescanbereducedoreliminated.ManyCNCmachinescanrununattendedduringtheirentiremachini
3、ngcycle,freeingtheoperatortodoothertasks.ThisgivestheCNCuserseveralsidebenefitsincludingreducedoperatorfatigue,fewermistakescausedbyhumanerror,andconsistentandpredictablemachiningtimeforeachworkpiece.Sincethemachinewillberunningunderprogramcontrol,theskilllevelrequiredo
4、ftheaCNCoperator(relatedtobasicmachiningpractice)isalsoreducedascomparedtoamachinistproducingworkpieceswithconventionalmachinetools.ThesecondmajorbenefitofCNCtechnologyisconsistentandaccurateworkpieces.Today’sCNCmachinesboastalmostunbelievableaccuracyandrepeatabilityspe
5、cifications.Thismeansthatonceaprogramisverified,two,ten,oronethousandidenticalworkpiecescanbeeasilyproducedwithprecisionandconsistency.AthirdbenefitofferedbymostformsofCNCmachinetoolsisflexibility.Sincethesemachinesarerunfromprograms,runningadifferentworkpieceisalmostas
6、easyasloadingadifferentprogram.Onceaprogramhasbeenverifiedandexecutedforoneproductionrun,itcanbeeasilyrecalledthenexttimetheworkpieceistoberun.Thisleadstoyetanotherbenefit,fastchange-overs.Sincethesemachinesareveryeasytosetupandrun,andsinceprogramscanbeeasilyloaded,they
7、allowveryshortsetuptime.Thisisimperativewithtoday’sJust-In-Timeproductrequirements.1.Motioncontrol-theheartofCNCThemostbasicfunctionofanyCNCmachineisautomatic,precise,andconsistentmotion.Ratherthanapplyingcompletelymechanicaldevicestocausemotionasisrequiredonmostconvent
8、ionalmachinetools,CNCmachinesallowmotioncontrolinarevolutionarymanner.AllformsofCNCequipmenthavetwoormoredirec