欢迎来到人人文库网! | 帮助中心 人人文库renrendoc.com美如初恋!
人人文库网
首页 人人文库网 > 资源分类 > PDF文档下载

外文翻译英文版文版---关于经旋压成型生产的高强度薄壁钢管缺陷发展的研究.pdf

  • 资源大小:612.85KB        全文页数:8页
  • 资源格式: PDF        下载权限:游客/注册会员/VIP会员    下载费用:5
游客快捷下载 游客一键下载
会员登录下载
下载资源需要5

邮箱/手机号:
您支付成功后,系统会自动为您创建此邮箱/手机号的账号,密码跟您输入的邮箱/手机号一致,以方便您下次登录下载和查看订单。注:支付完成后需要自己下载文件,并不会自动发送文件哦!

支付方式: 微信支付    支付宝   
验证码:   换一换

友情提示
2、本站资源不支持迅雷下载,请使用浏览器直接下载(不支持QQ浏览器)
3、本站资源下载后的文档和图纸-无水印,预览文档经过压缩,下载后原文更清晰   

外文翻译英文版文版---关于经旋压成型生产的高强度薄壁钢管缺陷发展的研究.pdf

69PRACTICALFAILUREANALYSISVOLUME15OCTOBER2001ANINVESTIGATIONOFTHEDEVELOPMENTOFDEFECTSDURINGFLOWFORMINGOFHIGHSTRENGTHTHINWALLSTEELTUBESKMRAJANANDKNARASIMHANSUBMITTED12JUNE2001;INREVISEDFORM6AUGUST2001FLOWFORMINGTECHNOLOGYHASEMERGEDASAPROMISING,ECONOMICALMETALFORMINGTECHNOLOGYDUETOITSABILITYTOPROVIDEHIGHSTRENGTH,HIGHPRECISION,THINWALLEDTUBESWITHEXCELLENTSURFACEFINISHTHISPAPERPRESENTSEXPERIMENTALOBSERVATIONSOFDEFECTSDEVELOPEDDURINGFLOWFORMINGOFHIGHSTRENGTHSAE4130STEELTUBESTHEMAJORDEFECTSOBSERVEDAREFISHSCALING,PREMATUREBURST,DIAMETRALGROWTH,MICROCRACKS,ANDMACROCRACKSTHISPAPERANALYZESTHEDEFECTSANDARRIVESATTHECAUSATIVEFACTORSCONTRIBUTINGTOTHEVARIOUSFAILUREMODESKEYWORDSMETALFORMING,INCLUSIONS,EXPERTSYSTEM,MICROSTRUCTURE,SURFACEFINISHPFANF8200156976ASMINTERNATIONALINTRODUCTIONFLOWFORMINGISAPROMISING,ECONOMICALMETALFORMINGTECHNOLOGYTHATCANMEETTHECHALLENGINGREQUIREMENTSOFHIGHSPECIFICSTRENGTH,CLOSEDIMENSIONALTOLERANCES,ANDEXCELLENTSURFACEFINISHDEMANDEDBYTHEDEFENSEANDAEROSPACEINDUSTRIESTHERELATIVELYLOWTOOLINGCOSTANDREMARKABLEMATERIALUTILIZATIONDUETOCHIPLESSMETALFORMINGPROVIDEECONOMICDRIVERS,WHILETHEABILITYTOACHIEVEHIGHSTRENGTHFINISHEDPRODUCTFROMLOWSTRENGTHSTARTINGMATERIALISDUETOSTRAINHARDENINGFLOWFORMINGISANINCREMENTALFORMINGPROCESSTHATUSESA3DVARIATIONOFBASICROLLINGPROCESSESANDCOMBINESROLLING,SHEARING,ANDBENDINGINTOONEOPERATIONITISSIMILARTONEITHERUPSETTINGNORSWAGINGESSENTIALLYAPOINTDEFORMATIONMETALFORMINGPROCESS,FLOWFORMINGRESULTSINAPARTHAVINGAHIGHLYDEFORMEDMICROSTRUCTURESIGNIFICANTINCREASESINYIELDSTRENGTH,ULTIMATETENSILESTRENGTH,ANDHARDNESS,ANDACORRESPONDINGREDUCTIONINDUCTILITY,ACCOMPANYTHEFLOWFORMINGPROCESSCONVENTIONALLY,TUBESAREPRODUCEDBYHOTEXTRUSIONFOLLOWEDBYDRAWINGORPILGERINGHOWEVER,ITISNOTPRACTICALTOHOTEXTRUDETHINWALLTUBESBEYONDASPECIFIEDLIMITDRAWINGISANEASIERANDLESSEXPENSIVEPROCESSTHANEXTRUSION;THEREFORE,ATHICKWALLTUBEISCOLDEXTRUDEDANDFINISHEDONADRAWBENCHORPILGERMILLTHEDRAWINGPROCESSISESSENTIALLYATENSILEPROCESSMICROCRACKSANDOTHERDEFECTSINSIDETHEMATERIALTENDTOPROPAGATEDURINGTHEDRAW,LEADINGTOFAILURETHEAREAREDUCTIONISTYPICALLYLIMITEDTO10FOREACHDRAWOFAHARDMATERIAL,ANDTHETOTALREDUCTIONMAYREQUIREANUMBEROFANNEALINGCYCLES1ANINCREASEINTHENUMBEROFDRAWING/ANNEALINGCYCLESINCREASESTHECOSTOFPRODUCTIONITISOBVIOUSLYVERYEXPENSIVETOUSEDRAWINGOPERATIONSTOPRODUCECOMPONENTSFROMHARDTOWORKMATERIALSHOWEVER,IFDIMENSIONALTOLERANCESARENOTCRITICAL,ITISADVISABLETOUSECHEAPCONVENTIONALCOLDDRAWNSTEELCDSTUBEFLOWFORMING,THEREFORE,OFFERSSEVERALADVANTAGESOVERCONVENTIONALTUBEMAKINGMETHODSTHEFLOWFORMINGPROCESSFLOWFORMINGISUSEDTOPRODUCEASEAMLESSTUBEWITHTIGHTDIMENSIONALTOLERANCESSEAMLESSTUBING,THEORETICALLY,MAYREPRESENTTHEULTIMATEINRELIABILITY2AMETALBLANKORPREFORMISFORMEDOVERAROTATINGMANDRELTHEMETALBLANKANDTHEMANDRELWHICHARELOCKEDTOGETHERROTATE,ANDTHEFORMINGROLLERFOLLOWSTHEMANDRELATAPRESETTHATHASBEENPROGRAMMEDINTOACNCFLOWFORMINGMACHINETHEPREFORMMETALISPLASTICIZEDBYTHELOCALAPPLICATIONOFHEAVYCOMPRESSIVEFORCESEXERTEDBYCONICALROLLERSTHEDEFORMEDMETALTAKESTHESHAPEOFTHEMANDREL,ANDPROPERWALLTHICKNESSISACHIEVEDBYCONTROLOFTHEGAPBETWEENTHEROLLERSANDTHEMANDRELFLOWFORMINGCANBEDIVIDEDINTOTWODISTINCTPROCESSESFORWARDFLOWFORMINGANDREVERSEFLOWFORMINGINFORWARDFLOWFORMING,ROLLERFEEDANDDEFORMEDMATERIALMOVEMENTAREINTHESAMEDIRECTIONTHEFORMEDMATERIALISUNDERTENSION,ANDTHEKMRAJAN,ARMAMENTRESEARCHANDDEVELOPMENTESTABLISHMENT,PUNE411021,INDIAKNARASIMHAN,DEPARTMENTOFMETALLURGICALENGINEERINGANDMATERIALSSCIENCE,IIT,BOMBAY400076,INDIACONTACTEMAILNARAMETIITBACINANINVESTIGATIONOFTHEDEVELOPMENTOFDEFECTSDURINGFLOWFORMINGCONTINUED70PRACTICALFAILUREANALYSISVOLUME15OCTOBER2001MATERIALUNDERTHEROLLEREXPERIENCESCOMPRESSIVESTRESSINREVERSEFLOWFORMING,ROLLERFEEDANDMATERIALMOVEMENTAREINOPPOSITEDIRECTIONSTHEMATERIALUNDERTHEROLLERISINACOMPRESSEDSTATEWHILETHEFORMEDPARTISSTRESSFREEAREVERSEFLOWFORMINGTECHNIQUEWASUSEDFORTHEPRESENTSTUDYANDISSCHEMATICALLYILLUSTRATEDINFIG1OBJECTIVESTHISPAPERDESCRIBESANINVESTIGATIONOFTHECAUSEOFDEFECTSANDFAILURESDURINGFLOWFORMINGOFTHINWALLHIGHSTRENGTHTUBESFROMAISI4130STEELTHEINVESTIGATIONINCLUDESSTUDYOFTHEVARIOUSMETALLURGICALAND/ORMACHINEPARAMETERSLIKELYTOCAUSETHESEPROBLEMSTHECOMMONDEFECTSREPORTEDFORFLOWFORMINGOFTUBESAREDIAMETRALGROWTH,PREMATUREBURST,BUILDUP,FISHSCALING,ANDBELLMOUTHING3OTHERTYPESOFDEFECTSINCLUDEUNEVENWALLTHICKNESS,MICROCRACKS,ANDMACROCRACKS4,5ADVANCEDCNC3ROLLERFLOWFORMINGMACHINESAREABLETOMANUFACTUREHIGHQUALITYPRECISIONTUBESHOWEVER,METALLURGICALORMATERIALDEFECTSSUCHASINCLUSIONSANDNONUNIFORMGRAINSTRUCTUREMAYAFFECTTUBEQUALITYADDITIONALLY,SELECTIONOFUNSUITABLEFORMINGPARAMETERSMAYALTERTHEQUALITYOFTHETUBINGPRODUCEDTHISPAPERRELATESTHEMETALLURGICALQUALITYOFTHESTEELTOTHEABILITYTOACHIEVEHIGHQUALITYTHINWALLEDFLOWFORMEDTUBING5,6EXPERIMENTALOBSERVATIONSBECAUSEOFITSAVAILABILITY,LOWCOST,ANDREASONABLYGOODCOLDFORMABILITY,SAE4130STEELWASSELECTEDFORTHEMANUFACTUREOFTHINWALL,HIGHSTRENGTHSEAMLESSTUBESINPRESSUREVESSELAPPLICATIONSREVERSEFLOWFORMINGWASUSEDFORTHESEPRESSUREVESSELSTHEDEVELOPMENTWORKDESCRIBEDINTHISPAPERUSEDSAE4130STEELTHATWASNOTELECTROSLAGREMELTEDTHEINCLUSIONRATINGSOFTHISGRADEOFSTEEL,BASEDONASTME45,AREASFOLLOWSSULFIDESALUMINASILICATESGLOBULAROXIDESTHINTHICKTHINTHICKTHINTHICKTHINTHICK15052510151505THEDISSOLVEDOXYGEN,NITROGEN,ANDHYDROGENINTHESTEEL,ASDETERMINEDBYANALYSIS,WAS22PPMOXYGEN,110PPMNITROGEN,AND3PPMHYDROGENA4AXISCNCFLOWFORMINGMACHINEWITHA3ROLLERCONFIGURATIONWASUSEDFORTHEEXPERIMENTALWORKAPHOTOMICROGRAPHOFTHEFLOWFORMINGMACHINEISSHOWNINFIG2THEPREFORMATHICKWALLEDSTARTINGMATERIALFORFLOWFORMINGWASFABRICATEDBYFORGINGBOTHUPSETTINGANDDRAWING,PIERCINGWITHTAPEREDPUNCHES,ANDMANDRELFORGING,FOLLOWEDBYHARDENINGANDTEMPERINGTHEFLOWFORMINGOPERATIONWASCOMPLETEDINTHREEPASSESWITHOUTANYINTERMEDIATEANNEALTHEFIG1SCHEMATICDIAGRAMOFREVERSEFLOWFORMINGPROCESSFIG2FOURAXISCNCFLOWFORMINGMACHINEWITHA3ROLLERFIG3TRIMMINGANDCUTTINGOFTENSILESPECIMENFROMFULLYFORMEDTUBEMANDREL71PRACTICALFAILUREANALYSISVOLUME15OCTOBER2001HARDNESSANDPERCENTAGETHICKNESSREDUCTIONASSOCIATEDWITHEACHPASSARESHOWNINTABLE1THEFLOWFORMEDTUBE,AFTERUNDERGOINGATOTALPERCENTAGETHICKNESSREDUCTIONOFABOUT88,WASTRIMMED,ANDTENSILETESTSAMPLESWERETAKENFROMAFULLYFORMEDEXTRALENGTHOFTHETUBEASPERASTMA370FIG3THESPECIFIEDANDACHIEVEDMECHANICALPROPERTIESANDDIMENSIONALACCURACIESAREPRESENTEDINTABLE2PROOFPRESSURETESTINGTUBESTHATSATISFIEDTHESPECIFIEDMECHANICALPROPERTIESANDDIMENSIONALACCURACYREQUIREMENTSWERESUBJECTEDTO100HYDRAULICTESTINGTHETUBESWERESUBJECTEDTOAPRESSURE10ABOVETHEMAXIMUMEXPECTEDOPERATINGPRESSUREFORABOUTONEMIN,THENCHECKEDFORPERMANENTSET,IFANY,ANDPREMATUREFAILURENOTESTINGININDUCEDFAILUREORPERMANENTSETWASACCEPTEDAFTERPASSINGTHISTEST,THETUBESWERESUBJECTEDTOBURSTTESTINGBURSTPRESSURETESTINGONETUBEOUTOFEACHGROUPMANUFACTUREDFROMTHESAMEHEATOFSTEELANDLOTOFPROCESSEDPREFORMSWASRANDOMLYSELECTEDANDSUBJECTEDTOBURSTPRESSURETESTINGTHEBURSTPRESSURETESTCONFIRMSTHEMARGINOFSAFETYOVERTHEMAXIMUMEXPECTEDOPERATINGPRESSUREAFEWBURSTTUBESARESHOWNINFIG4DEFECTSDEFECTSINTHEFLOWFORMEDTUBESMAYCAUSEFAILUREINTHEPROOFORTHEBURSTTESTSTHETYPESOFDEFECTSANDASSOCIATEDFAILURESCANBECATEGORIZEDASMICROCRACKS,MACROCRACKS,DIAMETRALGROWTH,OVALITY,FISHSCALING,ANDPREMATUREBURSTINGTHEFLOWFORMINGPROCESSOCCASIONALLYINTRODUCESWAVINESSORBULGESONTHEOUTERFACEOFTUBESSUCHDEFECTSOCCURONLYUNDERCERTAINWORKINGCONDITIONSTHISPHENOMENONISCALLED“PLASTICFLOWINSTABILITY”5KOBAYASHI7ANALYZEDINSTABILITYINCONESPINTABLE2MECHANICALPROPERTIESANDDIMENSIONALTOLERANCESOFFLOWFORMEDTUBEMECHANICALPROPERTIESDIMENSIONALTOLERANCESUTS02YIELDSTRENGTHEIOVALITYSTRAIGHTNESSSURFACEROUGHNESSMPAMPAMMMMCLAMSPECIFIED1200MIN900MIN6MIN02MAX015MAXACTUAL1250135095011007801502001015N5N6TABLE1FLOWFORMINGSEQUENCEWITHTHICKNESSANDHARDNESSVARIATIONSINEACHPASSPASSNOINITIALTHICKNESSFINALTHICKNESSINITIALHARDNESSFINALHARDNESSTHICKNESSOFPREFORMMMMMHRCHRCREDUCTION119509752128502975487528305034875200303160FIG4BURSTPRESSURETESTEDFLOWFORMEDTUBEANINVESTIGATIONOFTHEDEVELOPMENTOFDEFECTSDURINGFLOWFORMINGCONTINUED72PRACTICALFAILUREANALYSISVOLUME15OCTOBER2001NINGANDCONCLUDEDTHATWRINKLINGONTHEPRESPUNFLANGEOFTHECONEISCAUSEDBYRELIEFOFTHERESIDUALCOMPRESSIVESTRESSTHATARISESINTHETRACTIONFREEFLANGETHECONESPINNINGINSTABILITYISSIMILARTOTHEWRINKLINGPHENOMENONINDEEPDRAWINGOPERATIONSGURANDTIROSH5STUDIEDTHEPLASTICFLOWINSTABILITYINTUBESPINNINGANDFOUNDTHATINSTABILITYOCCURSIFTHECIRCUMFERENTIALLENGTHOFCONTACTSOFTHEROLLERISMUCHLONGERTHANTHEAXIALLENGTHOFCONTACTL,IE,IFTHERATIOSLISVERYHIGHHIGHSLRATIOSHELPMAINTAINACIRCULARCROSSSECTIONINTHETUBE,WHILELOWRATIOSLEADTOGEOMETRICINACCURACIESDUETOHIGHCONSTRAINTFORFLOWINTHEAXIALDIRECTIONTHESEINSTABILITIES,WAVINESSBULGES,ANDOVALITYARERELATEDTOCONTROLOFPRESSUREVARIABLES,NOTTHEMATERIALQUALITYAND,HENCE,SHOULDNOTBECONSIDEREDMETALLURGICALDEFECTSCRACKINGAFULLYFLOWFORMEDTUBEFROMTHENONELECTROSLAGREMELTGRADESAE4130STEELWITHATOTALREDUCTIONOF90THICKNESSOFTENCRACKEDAFTERPRESSURETESTINGANDDIMENSIONALINSPECTIONALONG,SHARP,LONGITUDINALTHROUGHWALLCRACKDEVELOPEDINTHETUBEASSHOWNINFIG5METALLURGICALINVESTIGATIONOFTHEFAILEDTUBEREVEALEDTHEPRESENCEOFALARGENUMBEROFINCLUSIONSINTHEMATERIALINCLUSIONSANDSTRINGERSCREATEDLARGESTRESSCONCENTRATIONSATHARDPARTICLEMATRIXINTERFACESTHEMECHANICALBONDBETWEENTHEFIG5THROUGHANDTHROUGHSHARPLONGITUDINALCRACKINAFLOWFORMEDTUBEFIG6MICROCRACKSINFLOWFORMEDTUBEFIG7SAMPLEINDICATINGINCLUSIONS100FIG8FLOWFORMEDTUBEWITHFISHSCALESAFTERFINALPASS

注意事项

本文(外文翻译英文版文版---关于经旋压成型生产的高强度薄壁钢管缺陷发展的研究.pdf)为本站会员(淘宝运营)主动上传,人人文库网仅提供信息存储空间,仅对用户上传内容的表现方式做保护处理,对上载内容本身不做任何修改或编辑。 若此文所含内容侵犯了您的版权或隐私,请立即通知人人文库网(发送邮件至[email protected]或直接QQ联系客服),我们立即给予删除!

温馨提示:如果因为网速或其他原因下载失败请重新下载,重复下载不扣分。

关于我们 - 网站声明 - 网站地图 - 资源地图 - 友情链接 - 网站客服客服 - 联系我们

网站客服QQ:2846424093    人人文库上传用户QQ群:460291265   

[email protected] 2016-2018  renrendoc.com 网站版权所有   南天在线技术支持

经营许可证编号:苏ICP备12009002号-5