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外文翻译-关于焊接滚轮架轴向窜动的实验研究.doc

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外文翻译-关于焊接滚轮架轴向窜动的实验研究.doc

第1页Jounalofmatenalsprocessingtechnology631997881886ExperimentandstudyintotheaxialdriftingofthecylinderofaweldingrollerbedFenggangshen,xidepan,jinxueWeldingresearchinstiute,xianjiaotonguniversity.Xian.shaanxiprovince710049.P.R.chinaAbstractThebasictheoryoftheaxialdriftingofthecylinderofaweldingrollerbedisintroducedinthepaper,andatthesametimeexperimentandstudyonthemechanismoftheaxialdriftingofthecylinderhavebeendoneonanexperimentalmodeloftheweldingrollerbed.Itisshownthatthemaincauseoftheaxialdriftingofthecylinderliesintheexistenceofaspiralanglebetweenthecylinderandthecylinderandtheroller.therelativeaxialmotionsbetweentherollerandthecylinderarecomposeofspiralmotion,elasticslidingandfrictionalsliding.Thetheoryofcompatiblemotionandnoncompatiblemotionisputforwardfortheaxialmotionsofthecylinder.therelativeaxialmotionsofthecylinder.TherelativeaxialmotionbetweentherollersandthecylinderiscoordinatedbyelasticslidingandfrictionalslidingbetweenthemKeywordsweldingrollerbedcylinderrolleraxialmotionspiralangle1IntroductionInweldingproduction,theassemblyandcircularseamweldingofrotaryworkpieces,suchasaboiler,apetrochemicalpressurevesselandsoon,areconductedonaweldingrollerbed.WhenrotatingOnaweldingrollerbed.Thecylindewillinevitablyproduceaxialdriftingduetomanufacturing,assemblingtoleranceoftheweldingrollerbedandthecylinderssurfaceirregularitydivergiugfromanidealrotaryworkpiece,thustheweldingproceduremaynotbecarriedoutsuccessfully.Itisnecessary,therefore,tostudythemechanismoftheaxialdriftingofthecylindertosolvetheproblemoftheaxialdriftingofthecylinderincircumferentialwelding.Theresultsoftheresearchwillbenefitthestudyinganddesigningofantidriftingweldingrollerbed.especiallytheanalysisoftheappliedforcesonthebed,andleadtodeterminingthemanufacturingandassemblingtoleranceofthebed,andprovidingthebasisoftheoryforthemechanicaladjustingmodetoavoidaxialdrifting,theadjustingmodeofclosedcircuitinthecontrolcircuit,andtheselectionoftheadjustingvalue.2.Theoreticalanalysis2.1.WeldingrollerbedandcylinderAweldingrollerbedisgenerallycomposedoffourrollers.Drivenbythe第2页drivingroller,thecylindermakesarotaryuniformmotionarounditsaxisshowninFig.I,duringwhichthecircumferentialweldingprocedureiscarriedoutInFig.1,aisthecentralangle,Sisthesupportingdistance,Listhespanoftheroller.andV,isthecircularlinearvelocityofthecylinder,alsonamedtheweldingvelocity2.Theaxisofthecylinderwillbenotparalleltothatofarolleriftherollerisdeflectedbyacertainanglefromthedealposition,orifthecentersofthefourrollerslieintheverticesofasimplequadrilateral,orifthecentersofthefourrollersarenotonthesameplane,orifthecircularityofthecylinderisirregularbecauseofdeviationinmanufacturingandassembling.Thus.thecylinderwillnevitablymovealongitsaxiswhenrotatingonabedthecontactofthecylinderandarollercanbecansideredaspointcontactifcytindersaxisandrollersaxisdonotlieinthesameplane.SupposePisthepointofcontact.thecylindersnormalplaneAisdefinedbytheplaneonwhicharethecylindersaxisandgeneratrixnacrossthepointoftangencyonthecylindershowninfig2makeacylinderstangentplaneBacrosspointP.Thus,planeAisverticaltoplaneB.lcisacylinderstangentacrossPandliesinplaneB.IristherollerstangentacrossthesamepointP,andliesinplaneBalso.Ingeneral,θisdefinedastheaxialdeviationanglebetweentherolersaxisandthecylindersaxisβisdefinedasthespiralanglebetweengeneratrixnandm.aprojectivelineobtainedbyprojectingtherollersgeneratrixmacrosspointponplaneBandγisdefinedastheprojectiveanglebetweennandm,aprojectivelineobtainedbyprojectingmonplaneA.Fig.3indicatesthattherelationshipamongstthethreeanglesistanβtan2θtan2γInFig.3,SB,SθandSγ,arecalledthespiraldisplacementvector,theaxialdeviationdisplacementvectorandtheprojectivedisplacementvectorrespectively.theirrelationshipbeing第3页Fig.2GeometricrelationshipbetweenthecylinderandanindividualrollerFig.3Relationshipbetweentheanglevectorandthedisplacementvector2.2.2relativeaxialmotionsrelationship1spiralmotion2.Fig.4ComponentofaxialvelocityBecausetherollersaxisisnotparalleltothecylinderscentralline,thereisaspiralangleβbetweenVr,.andVc,onthepointofcontactshowninFig.2.Whentherollerandcylinderrotatesynchronisticallyaroundtheirownaxes,drivenbytangentialfrictionalforce.aspiraleffectwilloccurbecauseofthedifferent第4页linearvelocitydirectionbetweentherollerandthecylinderatpointPofcontactThecylinderhasacomponentofaxialvelocity,whereVcisthecircularlinearvelocityofthecylinder.isthecylindersaxialcomponentvelociryexertedbysingleroller,andjcanbe1.2,3,4,representingthefourrollers,respectively.2ElasticslidingBecauseoftheexistenceofaspiralangle,anaxialforceFajactsoncylinder.WhentheforceislessthanthemaximumaxialfrictionalforcefNjwherefisthefrictionfactor,andNjisthenormalpressurebetweenasinglerollerandthecylinder,thecylinderwillslideelasticallyovertherolleralongtheaxialdirection23Thecomponentoftheslidingvelocityis.whereeistheelasticslidingfactorformetallicroller.eO.OOl0.005.3FrictionalslidingWhenFajisgreaterthanthemaximumfrictionalforcefNj,thecylinderwillmakeafrictionalslidingovertheroller.TheslidingresistanceisfNj3.ThecomponentofthefrictionalslidingvelocityonCylinderisVajthemagnitudeanddirectionofwhichcanbedeterminedbytheuniversalrelationshipbetweenthecylinderandthefourrollersFrictionalslidingwillleadtothewearandtearofthesurfaceofthecylinderandtherollers.whichisunexpectedinweldingproductionWhenthecylinderdrifts,abovethreekindsofmotiondonotoccursimultaneouslyIhereforc.theaxialdriftingvelocityofthecylinderisnotthealgebraicsumofthethreecomponentsofvelocityInthecaseofelasticsliding,theaxialvelocityis.2.3axialmotionofthecylinderonaweldingrollerbed2.3.1AxialcompatiblemotionUnderidealconditions,whenspiralanglesβjbetweenthecylinderandthefourrollersareallthesame,thatisβ1β2β3β4βthecylinderwillmoveitscompatiblespiralmotion.TwocategoriescanbeclassifiedtoanalyzetheaxialmotionofthecylinderIWhentheredoesnotexistanaxialcomponentduetogravity.thecylindersaxialdriftingvelocityis

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