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1、桂林电子科技大学毕业设计（论文）报告用纸第29页共29页编号：毕业设计(论文)外文翻译（原文）学院：机电工程学院专业：机械设计制造及其自动化学生姓名：赵盛伟学号：0801120319指导教师单位：桂林航天工业学院姓名：梁伟职称：高级工程师2012年5月15日桂林电子科技大学毕业设计（论文）报告用纸第29页共29页CNCLATHELessons1ComponentsofModernCNCLathesTheCNClatheismachinetoolthatcanremovematerialfromwork-piece,whichisclampedandrotatedab
2、outanaxis.Thismachinetoolisusedprimarilyforproducingsurfacesofrevolutionandflatedges.Ofallmetalcuttings,mostisdonewithasharpsingle-pointcuttingtool.ModernCNClathesuseturretstoholdcuttingtoolsrigidlyandmovecuttingtoolsaccurately.Theturretalsohasautomatictool-changingcapability;itisusedt
3、oquicklytakeanoldtooloutandanewtoolintoitscuttingposition.Afrontturretisbuilttomovetoolsfrombelowthespindlecenterlineuptothework.Arearturret,ontheotherhand,movestoolsfromabovethespindlecenterlinedowntothework.Therefore,machinesequippedwithfrontandrearturretscanexecutecuttingoperationsf
4、romaboveandbelowtheworksimultaneously.Lathesaremachinetoolsdesignedprimarilytodoturning,facingandboring,Verylittleturningisdoneonothertypesofmachinetools,andnonecandoitwithequalfacility.Becauselathesalsocandodrillingandreaming,theirversatilitypermitsseveraloperationstobedonewithasingle
5、setupoftheworkpiece.Consequently,morelathesofvarioustypesareusedinmanufacturingthananyothermachinetool.Theessentialcomponentsofalathearethebed,headstockassembly,tailstockassembly,andtheleadscrewandfeedrod.Thebedisthebackboneofalathe.Itusuallyismadeofwellnormalizedoragedgrayornodularcas
6、tironandprovidessheavy,rigidframeonwhichalltheotherbasiccomponentsaremounted.Twosetsofparallel,longitudinalways,innerandouter,arecontainedonthebed,usuallyontheupperside.SomemakersuseaninvertedV-shapeforallfourways,whereasothersutilizeoneinvertedVandoneflatwayinoneorbothsets,Theyareprec
7、ision-machinedtoassureaccuracyofalignment.Onmostmodernlathesthewayaresurface-hardenedtoresistwearandabrasion,butprecautionshouldbetakeninoperatingalathetoassurethatthewaysarenotdamaged.Anyinaccuracyinthemusuallymeansthattheaccuracyoftheentirelatheisdestroyed.Theheadstockismountedinaf
