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外文翻译飞机零件加工的急进高速铣床.doc外文翻译飞机零件加工的急进高速铣床.doc

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编号:201311171439306634    类型:共享资源    大小:1.25MB    格式:DOC    上传时间:2013-11-17
  
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附录A:英文资料Ultra-High-SpeedProfilerforAircraftPartsMachiningUHP-120B:DevelopmentGoalsandPerformanceKazuyaTanakaManagerDesigningSect.Ⅱ,EngineeringDept.Ⅰ1.IntroductionItisgenerallysaidthattheconditionssurroundingtheaircraftindustryhavebeenlessthanoptimalsincetheterroristattackofSeptember11,2001,buttheJapaneseaircraftindustryseemstobeinaslightlydifferentsituation.ThisobservationissupportedbythefactthattheDefenseAgency’s“PX”(advancedanti-submarinepatrolplane)and“CX”(cargotransportplane)projectshavebeenapproved,andBoeing-relatedandAirbus-relatedcontractshavenotdeclinedsignificantly.Thankstotheseandotherfactors,suchasthefactthattheindustryisenteringtheequipmentreplacementphase,theJapaneseaircraftindustryiscurrentlyinrelativelygoodshape.Undertheinfluenceoftheglobalmarketneeds,thereisverystrongdemandforreducingthecostsofcivilaircraftparts.Tomeetthisdemand,aircraftmanufacturersandjobshopscontractedtosupplypartstothemhavebeenworkinghardtoreducecostandimprovemanufacturingtechnologyandproductivity.Thenumberofaircraftproducedbythemanufacturersofsmalljetaircraftisincreasingatamuchfasterratethanthenumberofaircraftproducedbymanufacturersmoreorlessspecializinginlargeraircraft,suchasBoeingandAirbus.Despitethesteadygrowthofdemand,jobshopsundercontractwiththeseaircraftmanufacturersarebeingfacedwithincreasingpressuresforcostreduction.TheemergenceofSoutheastAsiancountriescapableofproducingpartsatlowcosthasmadepricecompetitionfiercer.TheChineseaircraftindustryisburstingwithenergybecausejobshopsinChinacannowcompetewithJapanesejobshopsinleadtimeandqualityinadditiontobeingabletoproducepartsatlowercosts.Giventheseglobaltrends,itcanbesaidthattheJapaneseaircraftindustry’spositionisdelicateinthecompetitivemarket.Inspiteoflead-timeandqualitysuperiority,theJapaneseaircraftindustryisfightingasteeplyuphillbattleinpricecompetition.Tohelpcopewiththesituationasamachinetoolmanufacturer,SNKhasdevelopedUHP-120B,anadvanced5-axisultra-high-speedhorizontalprofilerthatisatoncemostcost-effectiveandhighlyproductive.Therestofthisarticleintroducesthenewprofiler.2.Background:BriefHistoryofProfilerDevelopmentatSNKSincethedevelopmentofSM-13SparMill(with13numericallycontrolledaxes)in1967,SNKhasdevelopedmanymachinetoolsdesignedforaircraftpartsmachiningandfive-axisprofilers,anddeliveredmanymachinestospecialtyjobshopsbothinJapanandabroad.Oneofthelargermachinesrecentlydevelopedanddeliveredisatwo-gantry,A&B-axis-type,three-spindlefive-axisprofilerwitha64-meter-longbedwitha4-meter-wideworkingsurface(Photo1).AsshowninPhoto1,theseprofilersareverticalspindlemachinesthatenabletheoperatortosetupalargeworkpieceonthebedinastableposition.Photo1Astimepassed,however,thewayaircraftpartsaremanufacturedhaschanged:machiningofforgings,whichusedtobethemethodofmanufacturingaircraftparts,begantobereplacedbythemethodofmachiningcomplexpartsoutofsolidmaterialinordertoreducethenumberandweightofparts.Thismeantremovingmostofthematerialduringmachining.Useofhigh-speedmachining,whichisdesignedtoincreaseproductivity,alsodramaticallyincreasedthevolumeofmetalremovedperhour,makingverticalspindlemachinesanunrealisticchoicefromthestandpointofchipremoval.Tomeetthechangingneeds,SNKdevelopedHPS-4B(Photo2),alarge5-axishigh-speed,Photo2horizontal,tilting-table-typeprofilerdesignedspecificallyforhigh-speedmachiningofcomplexpartsoutofsolidmaterial,easysetupandefficientchipremoval.Thenewmachinewasputonexhibitatthe1998Chicagoshowandwashailedbyaircraftpartsjobshops.Since,however,HPS-4Bisalargemachinewitha2*10mmachiningenvelope,itwastoolargeandtooexpensiveforsmallerjobshops.Photo3Todemonstratethesuperiorityofthemachineconceptandeasyoperationofferedbythistypeofmachine,SNKdevelopedamachinebasedonasimilarconcept.Thismachine,HPS-120B,isacompactandreasonably-priced5-axishigh-speedhorizontalprofiler(Photo3)andwasexhibitedatthe2000Chicagoshow.Thismachinewasacclaimedforitsperformanceandeconomyandhasnowbecomeoneofthegreatestvalue-addedmodelsoftheSNKprofilers.Marketneeds,however,havechangedrapidly,andtherehasbeenincreasingpressureforcostreductionasmentionedearlier.Recognizingtheneedforahigh-speedprofilercapableofperformingmachiningwithunprecedentedefficiency,SNKdevelopeditsnewest5-axisultra-high-speedhorizontalprofiler,UHP-120B,thatinheritstheacclaimedfeaturesoftheHPSseriesofprofilers,andputthemachineonexhibitatthe2001EMOshow.3.UHP-120B:DevelopmentGoalsandPerformanceTheaimofdevelopmentofUHP-120Bistooffertousersacost-effectivemachinethatboostsproductivityinthemachiningofmedium-andsmall-sizedpartsofaluminum,amaterialwidelyusedinaircraftapplications.UsingHPS-120B,whichhasprovenperformanceinthefieldofhigh-speedmachining,asabasemachine,SNKdevelopedUHP-120B(Photo4)throughextensiveresearchanddevelopment.Photo4Therestofthissectionintroducesprincipaltechnologiesincorporatedintothenewmachine
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