英文文献科技类原文及翻译

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1、外文文献翻译本科毕业设计(论文)外文翻译姓名:王文超学号：200715010220专业:电气工程及其自动化班级:电气071502指导教师:智泽英职称：副教授日期:2011年6月12日电子信息工程学院ThebasicsofComputerNumericalControl外文文献翻译WhilethespecificintentionandapplicationforCNCmachinesvaryfrommachinetypetoanother,allformsofCNChavecommonbenefits.Thoughthethrustofthispresentationistoteach

2、youCNCusage,ithelpstounderstandwhythesesophisticatedmachineshavebecomesopopular.HerearebutafewofthemoreimportantbenefitsofferedbyCNCequipment.ThefirstbenefitofferedbyallformsofCNCmachinetoolsisimprovedautomation.Theoperatorinterventionrelatedtoproducingworkpiecescanbereducedoreliminated.ManyCNCm

3、achinescanrununattendedduringtheirentiremachiningcycle,freeingtheoperatortodoothertasks.ThisgivestheCNCuserseveralsidebenefitsincludingreducedoperatorfatigue,fewermistakescausedbyhumanerror,andconsistentandpredictablemachiningtimeforeachworkpiece.Sincethemachinewillberunningunderprogramcontrol,t

4、heskilllevelrequiredoftheaCNCoperator(relatedtobasicmachiningpractice)isalsoreducedascomparedtoamachinistproducingworkpieceswithconventionalmachinetools.ThesecondmajorbenefitofCNCtechnologyisconsistentandaccurateworkpieces.Today’sCNCmachinesboastalmostunbelievableaccuracyandrepeatabilityspecific

5、ations.Thismeansthatonceaprogramisverified,two,ten,oronethousandidenticalworkpiecescanbeeasilyproducedwithprecisionandconsistency.AthirdbenefitofferedbymostformsofCNCmachinetoolsisflexibility.Sincethesemachinesarerunfromprograms,runningadifferentworkpieceisalmostaseasyasloadingadifferentprogram.

6、Onceaprogramhasbeenverifiedandexecutedforoneproductionrun,itcanbeeasilyrecalledthenexttimetheworkpieceistoberun.Thisleadstoyetanotherbenefit,fastchange-overs.Sincethesemachinesareveryeasytosetupandrun,andsinceprogramscanbeeasilyloaded,theyallowveryshortsetuptime.Thisisimperativewithtoday’sJust-I

7、n-Timeproductrequirements.1.Motioncontrol-theheartofCNCThemostbasicfunctionofanyCNCmachineisautomatic,precise,andconsistentmotion.Ratherthanapplyingcompletelymechanicaldevicestocausemotionasisrequiredonmostconventionalmachin