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1、文献翻译（2009级本科）题目：数控机床学院：工程学院专业：机械设计制造及其自动化班级：1班姓名：孙奇学号：0922121指导教师：姜少杰2012年4月上海海洋大学0922121孙奇第8页共8页上海海洋大学0922121孙奇英文原文CNCmachinetoolsWhilethespecificintentionandapplicationforCNCmachinesvaryfromonemachinetypetoanother,allformsofCNChavecommonbenefits.Hereare
2、butafewofthemoreimportantbenefitsofferedbyCNCequipment.ThefirstbenefitofferedbyallformsofCNCmachinetoolsisimprovedautomation.Theoperatorinterventionrelatedtoproducingworkpiecescanbereducedoreliminated.ManyCNCmachinescanrununattendedduringtheirentiremachin
3、ingcycle,freeingtheoperatortodoothertasks.ThisgivestheCNCuserseveralsidebenefitsincludingreducedoperatorfatigue,fewermistakescausedbyhumanerror,andconsistentandpredictablemachiningtimeforeachworkpiece.Sincethemachinewillberunningunderprogramcontrol,theski
4、lllevelrequiredoftheCNCoperator(relatedtobasicmachiningpractice)isalsoreducedascomparedtoamachinistproducingworkpieceswithconventionalmachinetools.ThesecondmajorbenefitofCNCtechnologyisconsistentandaccurateworkpieces.Today'sCNCmachinesboastalmostunbelieva
5、bleaccuracyandrepeatabilityspecifications.Thismeansthatonceaprogramisverified,two,ten,oronethousandidenticalworkpiecescanbeeasilyproducedwithprecisionandconsistency.AthirdbenefitofferedbymostformsofCNCmachinetoolsisflexibility.Sincethesemachinesarerunfrom
6、programs,runningadifferentworkpieceisalmostaseasyasloadingadifferentprogram.Onceaprogramhasbeenverifiedandexecutedforoneproductionrun,itcanbeeasilyrecalledthenexttimetheworkpieceistoberun.Thisleadstoyetanotherbenefit,fastchangeover.Sincethesemachinesareve
7、ryeasytosetupandrun,andsinceprogramscanbeeasilyloaded,theyallowveryshortsetuptime.Thisisimperativewithtoday'sjust-in-time(JIT)productrequirements.Motioncontrol-theheartofCNCThemostbasicfunctionofanyCNCmachineisautomatic,precise,andconsistentmotioncontrol.
8、Ratherthanapplyingcompletelymechanicaldevicestocausemotionasisrequiredonmostconventionalmachinetools,CNCmachinesallowmotioncontrolinarevolutionarymanner2.AllformsofCNCequipmenthavetwoormoredirectionsofmotion,calleda
