防竄焊接滾輪架軸向竄動實驗研究中英文翻譯、外文文獻翻譯、外文翻譯

XXXX文獻翻譯二級學院XXXXXXX班級XXXXX學生姓名XX學號XXXXXXXXX防竄焊接滾輪架軸向竄動實驗研究摘要：簡述焊接滾輪架軸向竄動的基本理論,并同時在焊接滾輪架的實驗模型上進行了試驗研究。結果表明,焊接滾輪架軸向竄動的主要原因在于工件的翻轉存在著螺旋夾角，本文主要分析了螺旋角和工件的圓周速率對竄動的影響。關鍵詞:焊接滾輪架軸向運動螺旋角筒體線速度1.簡介在大厚壁、大型化、高容量、耐磨蝕的鍋爐、石油、化工壓力容器的焊接生產中，由于焊接滾輪架的制造安裝誤差以及筒體幾何形狀的不規(guī)則（偏離理想回轉體）等原因，筒體在滾輪架上轉動時，會不可避免的沿其軸向發(fā)生竄動，從而影響環(huán)縫的焊接質量。若不進行防竄處理，出現的竄動量大便無法進行焊接。本課題研究提供了當圓形工件焊接時，軸向竄動的機制.設計反竄動焊接滾輪架.尤其是應用于滾輪架之上。2.實驗2.1.實驗描述在圖1中試驗表明,初步的試驗研究了兩個因素:螺旋角和工件的線速度-影響軸向竄動的主要因素。在實驗過程，軸向位移Sa和軸向竄動速度Va測量方法如圖1。而進行的方法是將軸向位移傳感器安裝到的圓筒的一端，與傳感器相連的X-Y記錄器記錄工件的軸向位移,每5s記錄一次,平均竄動速度Va在每個角度可以計算出數據。在試驗階段，實驗模型是如下:一、調節(jié)四滾輪高度在同一個水平線上，并在矩形的四個頂點，那么滾輪與旋轉工件相對平衡，工件在一段很長的時間不竄動，或定期竄動一個很小的范圍。2.2實驗結果的討論2.2.1螺旋角的影響(1)例如圖2所示。Va的變化檢測條件是:vc=35m/hL=422mm,α=60"Va是與tanβ4成正比的，β4是與(1~~~6c)相關的，坡度線為3.06毫米/秒,Va不再正比tanβ4時,當β4大于6c,軸向竄動是隨著β4逐漸減小。由于只有一個驅動滾輪(rollerNo.4)的影響,β4可以改變的,而其他的仍然是零,工件作出了協(xié)調的運動。當β4的比例較小,Va也小。圓柱體軸向摩擦力,滾輪最大軸向摩擦力,汽缸產生彈性滑針對滾輪，軸向運動之間各滾輪和工件協(xié)調彈性滑動。因此Va是:理論曲線的斜率k可以按下列公式計算:k=3.06mm/s的實驗曲線。因此,在考慮到各方面的實驗,兩個斜坡上可被認為是大致相等。當β4比較大,滾輪與工件之間最大軸向摩擦力大于最大摩擦力,工件產生的摩擦滑動抵抗?jié)L輪存在的滑動摩擦力，由于竄動的存在,Va不再隨著tanβ4的增加而增加,而是逐漸減小。(2)以下三個實驗,工件的不協(xié)調軸向竄動隨之改變。由同一螺旋角度來衡量的一個主動滾輪及兩個，三個主動滾輪。三曲線之間的Sa和Va研究結果顯示如上圖，隨著滾輪數量的增加,Va逐漸增大。Va3>Va2>Va1當驅動滾輪的數量變化時,度氣缸的非兼容軸向運動將會有所改變.隨著同一螺旋角影響下滾輪數量的增加。兼容的分量越來越大,但互不兼容的分量越來越小。換句話說,工件的軸運動將轉化為是否兼容的問題。因此,最大軸向竄動Va由β角所決定，四輪有相同的螺旋角時Va為:2.2.2筒體線速度的影響螺旋角從平衡位置+2’對4號驅動滾輪的影響。工件將影響軸向竄動（例如下圖）所顯示va-VC的曲線,后者表明Va是與Vc成正比的,曲線的斜率大約是0.00708。因為β4=+2實在太小,工件相對每一滾輪沒有形成軸向竄動。因此,軸滾輪和工件之間的相對運動是完全協(xié)調的彈性滑動，Va為：Va正比于Vc。理論曲線的斜率k可以按下列方程K"=0.25tan4=0.25tan2'=0.00873wherek=0.00708mm/s.因此,在考慮到各方面的實驗,協(xié)調的兩個斜坡上可被認為是大致相等.3.結論（1）因為制造及裝配的偏差，工件的中心線與滾輪軸線不平行，沒有在同一平面,因此形成螺旋角β，存在β是發(fā)生軸向竄動的主要原因。工件軸線方向重力的分量影響,也是軸向竄動的一個原因。（2）合理調整軸運動,使不兼容的分量盡可能小和兼容分量盡可能大從而減小軸向竄動。（3）隨著滾輪數量的增加相同β角下的軸向竄動將增大,但不兼容的部分減少。隨著兼容部分的增加工件的軸向竄動速度將增加，當軸向滑動摩擦發(fā)生在滾輪和工件之間時，軸向竄動將被彈性摩擦和滑動摩擦所協(xié)調，但Vc并不與β成正比，關系如下：參考文獻：(1)ZWang.焊接機械設備教材，甘肅蘭州工業(yè)大學，張培源(1992)pp85-98(2)武漢材料技術研究所，南京化工研究所,與華南工學院，水泥生產機械設備,建筑工業(yè)出版社，中國北京,(1981)pp,184-187(3)J.Halling(ed.)，麥克米倫出版社,(1975)pp.174-200ExperimentandstudyintotheaxialdriftingofthecylinderofaweldingrollerbeAbstract：Thebasictheoryoftheaxialdriftingofthecylinderofaweldingrollerbedisintroducedinthepaper,andatthesametimeexperimentandstudyonthemechanismoftheaxialdriftingofthecylinderhavebeendoneonanexperimentalmodeloftheweldingrollerbed.Itisshownthatthemaincauseoftheaxialdriftingofthecylinderliesintheexistenceofaspiralanglebetweenthecylinderandthecylinderandtheroller.ThisarticlemainlyanalyzesthespiralAngleandcircumferentialvelocity'sinfluenceonthechannelingmotionartifacts.Keywords:weldingrollerbedaxialmotionspiralangleCylinderlinearvelocity1IntroductionTheWeldingandProductioninthebigThick-Cliff、TheLarge-Scale、High-Content、Endure-AblationofthepressurevesseloftheBoiler、Oil、chemical,becauseofreasonoftheerrorofthemanufacture-installationandtheabnormityofgeometry-formofthecylinder(departureidealgyrationobject),thecylinderwheelontherollerbed,inevitablyitwilloccuraxialdrifting,sothataffecttheweldingquality.Ifnottaketheanti-floatingmeasure,theweldingcannotgoingbecauseofthelargedrifting.Thistopicresearchwhenthecircularworkpiecewelding,axialdriftingmechanisms.Designthedynamicweldingrollerframe.Especiallyappliedtotherollerframe.2.Experiment2.1DescriphmofexpermentTheexperimentalmodelisshowninFig1.Experimentsweredonetostudytwofactors:thespiralangleandthecylinder’scircularlinearvelocity,whichaffecttheaxialdriftingofthecylinder.Intheexperimentingprocess.theaxialdisplacementSaandtheaxialdriftingvelocityVaofthecylinderweremeasuredbythevariationofthetwofactorsdescribedabove.ThemeasuringmethodisshowninFig.1,andiscarriedoutbymeansofbringinganaxialdisplacementsensorintocontactwithoneendofthecylinder.withthesensorbeingconnectedtoanX-Yrecordertorecordthecylinder’saxialdisplacementevery5s.LinearlyregressingtheplotSa--t(texpressestime),theaveragedriftingvelocityVa,ateverydeflectinganglecanbecalculated.Beforeexperimenting.theexperimentalmodelisinitialisedasfollows:first.theheightofthefourrollersisadustedbymeansofaleveltoputthecentersofthefourrollersinthesamehorizontalplane,andatthefourvertexesoftherectangle.thentherollersaredeflectedsothattherotatingcylinderisattherelativeequilibriumposition.Thenthecylinderdoesnotdriftoveralongtime.orperiodicallydriftoveraverysmallaxialrange2.2experimentresultsanddiscussion2.2.1Effectofspiralangle(I)Fig.6showsthatchangeofVawiththevariationofThetestingconditionis:positiverotalion,Vc=35m/hL=422mm,α=60”TheVa-tanβ4curveshowsthatVaisdirectlyproportionaltotanβ4whenβ4isrelativelysmall(1~~~6c).Theslopeofthelinebeing3.06mm/s,Vaisnolongerdirecllyproportionaltotanβ4whenβ4,isgreaterthan6CThecurveisanarchedcurve.i.e.withtheincrementofβ4,.Va,increases.butwiththeincrementofVagraduallybecomingsmalletBecauseonlyonedrivenroller(rollerNo.4)isdeflected,i.eβ4canbechangedwhilsttheothersremainzero,thecylindermakesanon-compatiblemotion.Whenβ4isrelativelysmall,Vaissmallalso.Theaxialfrictionalforcesbetweenthecylinderandrollersarelessthanthemaximumaxialfrictionalforce,andthecylinderproducesanelasticslidingagainstrollers.Axialmotionbetweeneachrollerandthecylinderiscoordinatedbyelasticsliding.thusVais:inthetheoreticalcurve,theslopeK’canbecalculatedbythefollowingequation:K=3.06mm/sintheexperimentalcurve.Thus,intakingaccountoftheexperimentaltolerance,thetwoslopescanbeconsideredtobeapproximatelyequal.Whenβ4isrelativelylarge,theaxialfrictionalforcesbetweenthecylinderandtherollersarelargerthanthemaximumaxialfrictionalForce,andcylinderproducesfrictionalslidingagainsttherollersBecauseofIheexistenceofslidingfrictionalresistance.Vaisnolongerlincartyincreasedwiththeincrementoftanβ4Withtheincrementoftanβ4theincrementofVa;withgraduallybecomesmaller(2)Thefollowingthreeexperimentswerearrangedtostudythecylinder’snon-compatibleaxialmotionfurther,deflectingpositivelyoneroller.tworollersandthreerollersbythesamespiralangletomeasurethreecurvesbetweenSaandvTheexperimentalresultsareshowninFig7.Withtheincrementinthenumberofdeflectedrollers,Vabecomesgreater.ieVa3>Va2>Va1Whenthenumberofdrivenrollersdeflectedisvaried,thedegreeofthecylinder’snon-compatibleaxialmotionwillbechanged.Withtheincrementofthenumberoflollersdeflectedbythesamespiralangle.thecompatiblecomponentbecomesgreater,butthenon-compatiblecomponentbecomessmaller.Inotherwords,thecylinder’saxialmotionwillbetransformedfromnoncompatiblemotiontocompatiblemotion.Thus,Vabecomesgreateralso,ultimately,beingequaltothecompatibleaxialvelocitydeterminedbythespiralangleβNow.thefourrollershavethesamespiralanyleβ.SothatVais:2.2.2effectofcircularlinearvelocityDeflectingdrivenrollerNo4toaspiralangleof+2”fromtheequilibriumposition,thecylinderwillsufferaxialdrifting,Fig.8showstheVa-Vccurve,whichlatterindicatesthatVaisdirectlyproportionaltoVc,theslopeofthecurvebeingapproximately0.00708becauseβ4=+2istoosmall,thecylinderdoesnotmakefrictionalslidingagainsteachroller.Thus,therelativeaxialmotionbetweentherollerandthecylinderiscompletelycoordinatedbytheirelasticsliding,sothatVaise.VaisdirectlyproportionaltoVeForthetheoreticalCurvetheslopeK*canbecalculatedbythefollowingequationK”=0.25tanβ4=0.25tan2'=0.00873whereK=0.00708mm/sintheexperimentalcurve.Thus,intakingaccountoftheexperimentaltolerance,thetwoslopescanbeconsideredtobeapproximatelyequal.3Conclusions(1).Becauseofthedeviationsduetomanufacturingandassembling.thecylinder’scentrallineandtheroller’saxisarenotparallel.i.e,theyarenotinthesameplane,andthereisaspiralangleβatthcpointofcontactbetweenthecylinderandtherollerinthecircularlinearvelocitydirection.Theexistenceofβisthebasicreasonfortheoccurrenceofaxialdrifting.Theeffectofgravityincylinder’saxialdirectionisalsooneofreasons