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ID:50323625
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页数:11页
时间:2020-03-08
《数控技术专业英语 教学课件 作者 黄义俊 电子教案统一模板(数控)Unit2.ppt》由会员上传分享,免费在线阅读,更多相关内容在应用文档-天天文库。
1、Unit2NC/CNCMachiningEquipmentLesson3TypesofCNCMachiningCenters2.1Lesson4CNCTurningCenter2.2ReadingMaterials3TheAdvantagesofCNCMachines2.3ReadingMaterials4TheDisadvantagesofCNCMachines2.42.1Lesson3TypesofCNCMachiningCentersMachiningcentersarethelatestdevelopmentinCNCtechnology.Thesesystemscome
2、equippedwithautomatictoolchangerswiththecapabilityofchangingupto90ormoretools.[1]Manyarealsofittedwiththemovablerectangularworktablescalledpallets.Thepalletsareusedtoautomaticallyloadandunloadworkpieces.Atasinglesetupmachiningcenterscanperformsuchoperationsasmilling,drilling,tapping,boring,an
3、dsoon.[2]Additionally,byutilizingindexingheads,somecentersarecapableofexecutingthesetasksonmanydifferentfacesofapartandatspecifiedangles.Turningcenterswithincreasedcapacitytoolchangersarealsomakingstrongappearanceinmodernproductionshops.[3]TheseCNCmachinesarecapableofexecutingmanydifferenttyp
4、esoflathecuttingoperationssimultaneouslyonrotatingpart.Inadditiontomachiningcentersandturningcenters,CNCtechnologyhasalsobeenappliedtomanyothertypesofmanufacturingequipment.Amongthesearewireelectricaldischargemachines(WEDM)andlasercuttingmachines.WEDMmachinesutilizeaverythinwireasanelectrode.
5、Thewireisstretchedbetweentworollersandcutsthepartlikeaband-saw.Materialisremovedbytheerosioncausedbyasparkthatmoveshorizontallywiththewire.CNCisusedtocontrolhorizontaltablemovements.WEDMmachinesareveryusefulforproducingmoldinserts,extrusionsandtrimdiesaswellasformtools.[4]LasercuttingCNCmachi
6、nesutilizeanintensebeamoffocusedlaserlighttocutthepart.Materialunderthelaserbeamundergoesarapidriseintemperatureandisvaporized.Ifthebeampowerishighenough,itwillpenetratethroughthematerial.Becausenomechanicalcuttingforcesareinvolved,laserscutpartswithaminimumofdistortionandhavebeenveryeffectiv
7、einmachiningslotsanddrillingholes.2.2Lesson4CNCTurningCenterCNCturningcenters,whileunlikechuckingcenters,aredesignedmainlyformachiningshaft-typework-pieceswhicharesupportedbyachuckandaheavy-dutytailstockcenter.Onfour-axismachines,twoopposedtu
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