简介：Roll的意思不是"卷:滚动"吗?老师难道是因为点点上课在吃"肉卷"面叫他名字?当然不是啦!原来,calltheroll是指"课前点名"。想象一下,老师手里拿着一卷长长的名单,准备点每一位同学的名字呢,是个是很形象?

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简介：近年来,造纸工业使用再生纸的比率增加,药品添加量增加、回收水的使用率上升,抄纸机的高速化,使得作为抄纸用具的毛毡和帆布的污垢量不断增加。传统的清洗方法往往使毛毡起毛和磨损,或者降低了毛毡的透气性。本文开发出了“SHOWRROLL”清洗系统,能够解决以上问题,并且这是一种环境友好的方法。

简介：Withtheincreasingimportanceofoceanexploitation,providinganti-rollingstabilityforshipsatanchorhasbecomemoreandmoreimportant.Thelift-generationtheoryoftraditionalfinstabilizersisbasedonincomingflowvelocity,whichisnotsuitableforexplainingliftgeneratedatanchor.Weanalyzednon-steadyflows,withforcesonfinstabilizersgeneratedbynon-incomingflowvelocityconditions,andgaveanewlift-generationmodel.Thecorrectnessofthemodelwasprovenbycomparingexperimentalresultsoffinstabilizermotionundernon-incomingvelocityconditionsfromthefluidcomputationsoftwarewiththatfromtheemulatorofthelift-generationmodel.Finally,themodelwasusedinananti-rollingsystemonashipandthereductionofrollwasmuchbetterthanwhatcouldbeachievedbypassiveanti-rollingtanks.

简介：Improvingefficiencyinrollgrindingprocessisacriticalissueinthesteelmill.Eachrollhastobegrindedtoawell-definedprofileandthentobemeasuredforqualitycheck.However,thesurfaceconditionsareinspectedbyusingdifferenton-lineinspectionprobesequippedonthegrinder.Therollnumberisauniqueinformationwhichcanbeusedtomergewithahugeamountofmeasurementdatasothattheconditionofeachrollisfullymonitored.Oneofthekeyfactorsthathindertheefficiencyinsuchprocessistheerrorsandtimeconsumptionduetohumanintervention.Inordertomitigatetheseissuesandtorealizethefullyautomaticgrindingprocess,radiofrequencyidentificationtechnology(RFID)couldbeasolutionandhasbeendevelopedinthispaper.ItiswellknownthatwhenanRFIDtagisplaceddirectlyuponametallicobject,intheabsenceofagaporasubstrate,itfunctionsratherpoorlyandevenbecomestotallydysfunctional.Thislimitation,inturn,posesarealbarriertotheuseoftheRFIDonmetallicobjects.ThispaperproposesaminiatureRFIDtagantennadesignforapplicationonrollnumberidentification.TheexperimentaltestsshowthatthemaximumreadrangeoftheproposedRFIDtagplacedonarollisapproximately1.5mandtheoverallsizeisonly32×18×3.2mm~3.AnRFIDsystemforrollnumberidentificationwasusedinarollshopandseveralremarkableimprovementswereachieved,includingthecompletelyautomaticgrindingprocessandtheerror-freeidentification,aswellasthehighpersonnelsafetyoperation.

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简介：Modelingofheattransferandsolidificationofcompositerollwasestablishedandusedtopredictthethermalhistoryandsolidificationprocessofrollduringsprayforming.Evolutionoftemperaturefieldofthepreformandcoolingrateinthegrowingdepositduringspraydepositionandpost-depositionwerenumericallysimulated.

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简介：瑞士RCSRollCareSystem公司将向中国提供首条高产能纸卷包装全自动生产线，该生产线每小时可处理180卷纸卷。随着新订单的签订．RCS公司将延续其在中国市场的成功经历。

简介：Conventionalorganicsolarcell’s(OSC)architectures,includingrigidtransparentsubstrate(Glass),conductiveelectrode(Indiumtinoxide,ITO)andsmallworkingareas,arewidelyutilizedinorganicphotovoltaicfields.However,suchastructureaswellasconventionalspin-coatingmethodobviouslyrestricttheirindustrialapplication.Inthisarticle,wereportthedepositionofsilvernanowires(AgNWs)ontheflexiblesubstratebyslot-dieprinting.TheobtainedAgNWsfilmsexhibitedahightransmittanceandalowresistance,andwerefurtherusedasthetransparentconductiveelectrodeofOSCs.Atypicalconjugatedpolymer,poly[(2,5-bis(2-hexyldecyloxy)phenylene)-alt-(5,6-difluoro-4,7-di(thiophen-2-yl)benzo[c][1,2,5]thiadiazole)](PPDT2FBT),wasusedastheactivematerialtofabricatelarge-area(7cm~2)solarcellsbyaslot-diecoatingprocess.Thepowerconversionefficiency(PCE)couldreach1.87%initiallyandfurtherincreasedto3.04%bythermalannealing.ComparedtotheperformanceofreferencecellonITOsubstrate,theresultindicatedthattheAgNWscouldbedevelopedasanalternativesubstituteofconductiveelectrodetofabricatethelarge-areaflexibleOSCsbyroll-to-rollprinting.

简介：Wepresentastudyofthenonlinearcouplinginternalresonancefortheheaverollandpitchperformanceofasparplatformunderthewaveandvortex-inducedloadswhentheratioofthefrequenciesofheave,rollandpitchareapproximately2:1:1.Inconsiderationofvaryingwetsurface,thethreeDOFsnonlinearcoupledequationsareestablishedforthesparplatformundertheeffectofthefirst-orderwaveloadsintheheaveandpitch,andvortexinducedloadsintheroll.Byutilizingthemethodofmulti-scaleswhenthevortex-inducedfrequencyisclosetothenaturalrollfrequency,thefirst-orderperturbationsolutionisobtainedanalyticallyandfurthervalidatedbythenumericalintegration.Sensitivityanalysisisperformedtounderstandtheinfluenceofthedampingandtheinternaldetuningparameter.Twocaseswithinternalresonanceareshown.Thefirstcaseisthatnosaturationphenomenonexistsundersmallvortex-inducedloads.Thefirstorderperturbationsolutionillustratesthatonlythevortex-inducedfrequencymotioninrollandthesuper-harmonicfrequencymotioninheaveareexcited.Thesecondcaseisthatthevortex-inducedloadsarelargeenoughtoexcitethepitchandasaturationphenomenonintheheavemodefollows.Theresultsshowthatthereisnosteadyresponseoccurrenceforsomecases.Forthesecaseschaosoccursandlargeamplitudesresponsecanbeinducedbythevortex-inducedexcitation.

简介：Lightweightdesignisoneofthedevelopmenttrendsoftheautomobileindustry.AneffectivewaytoachievelightweightautobodiesistouseAHSS(advancedhighstrengthsteel)forthesafetycomponentsofautomobiles.ThisstudyhastakendoorsillreinforcementsmadeofmartensiteAHSSastheobject,andperformedresearchontheAHSSrollformingtechnologiesandprototypedevelopmentoftypicalasymmetricopencomponents.Bymeansoffiniteelementanalysis(FEA)andsimulation,studieshavebeencarriedoutonthespringbackandedgewavedefectsduringAHSSrollforming,andanoptimizedprocessdesignhasbeenachieved.Thegenerationmechanismsofverticalbows,horizontalcambers,twists,pre-punchedholedistortionandcutendflarehavebeenanalyzed,andsolutionstothesedefectshavebeengiven.Inaddition,tesingoftherollformingprocessforAHSShasbeenconductedandtypicalsampleswithrequireddimensionalaccuracyhavebeenmanufactured.Thisstudyhasprovidedtechnicalsupportforthelarge-scaleapplicationofAHSS.

简介：Thethermalexpansionofworkrollsduringhotstriprollingwasmodeledbyatwo-dimensionaldifferencemethod.Thecalculationmodelwasvalidatedbycomparisonbetweenthepredictionstothemeasuredresults.Withthatmodel,theeffectsofrollingprocessparameterssuchastherollingplan,millpacing,coolantflowrateandsteppedcoolingontherollthermalprofilewereinvestigated.Theresultshowsthatsteppedcoolingofworkrollscanbeusedtocontrolcomplicatedflatnessdefectssuchasquarterbucklesduringhotstriprolling.

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简介：Thedynamicandstaticrecrystallizationbehaviorsoftwinrollcastlowcarbonsteelstripwereinvestigatedwithanattempttoprovideguidingdeformationparametersfortheonlinehotrolling.Inordertoinvestigatedynamicrecrystallizationbehavior,ascaststripwasreheatedandsoakedwithaustenitegrainsizesimilartothewidthleveloftheascastcolumnarstructure.Tensiletestwasusedandthedeformationtemperatureisintherangeof900℃to1100℃andstrainratesare0.01s-1,0.1s-1,1s-1.Theactivationenergyandstressexponentweredeterminedas306kJ/moland4.69respectively.Theratioofcriticalstraintothepeakstrainis0.65,andthatofcriticalstresstothepeakstressis0.92.ThedependenceofthepeakstrainontheinitialgrainsizeandZener-HollomonparametersZisεp=9.1×10-4×D00.48Z0.13.Thekineticsofthedynamicrecrystallizationandrecrystallizedgrainsizewaspredictedusingmodelspublished.Theascastcoarseausteniteweredramaticallyrefinedaftercompletedynamicrecrystallization.Forstaticrecrystallization,thetensiletestwascarriedoutonGleeble-3500thermo-mechanicalsimulator.Thedeformationtemperatureisintherangeof800℃to1200℃withstrainrate0.01s-1to1s-1.Theprestrainisfixedat0.04to0.12andtheinter-hitdelaytimevariesfrom1sto3000s.TheactivationenergyandAvramiexponentofstaticrecrystallizationweredeterminedas241kJ/moland0.54respectively.Akineticsmodelwasproposedtodescribethestaticrecrystallizationkinetics.Thepredictedresultswereingoodagreementwiththeexperimentalresults.

简介：The4-hicoldmillisoneofthekeywidestriptandemcoldrollingmillsandhasmanyadvantagesandcharacteristics.Themilltypeisthemostimportant,fundamentalandlong-termeffectivefactorforthestripshapecontrol.ManyadvancedmilltypessuchasCVC-4,HCWandPC-4,etcarecreatedbasedontheconventionalfour-rollmill.Thefactorsofmilltypewhichaffectthedeformationofrollsystem,suchasstripwidth,rollingforce,bendingforce,workrolldiameter,backupdiameterandsoon,arestudiedhowtoaffectrollgapcrown.Itprovidesagoodfoundationforimprovingtheshapeperformanceofmill.

简介：Inthispaper,therecentstateandproblemsofthesinkrollinCGLaredescribed.Severalmethodsofincreasingitsoperationallifespanareintroduced,suchassurfacecoatingtechnologyandsleevematerialtechnology.Fundamentallytheycannotsolvetheproblemsofsurfacequalitycausedbythecontactbetweenstripandroll.Onthisbasis,thenewlydevelopedprincipleandsolutionsforhotdipgalvanizingtechnologywithoutsinkrollarehighlyemphasized,theyareFloatTechnology,Electromagneticpumptechnology,Electromagneticenclosedslotbyhigh-frequencyAC,Electromagneticenclosedslotbyhigh-frequencyDC.Acomparisonamongtheirfunctionsandcharacteristicsismadeandthepossibilityofitsapplicationisalsodiscussed.Finallyitcomestoaconclusionthatelectromagneticenclosedslotrepresentsthedirectionofacontinuoushot-dipgalvanizingsteelstripinthethe21stcentury.Ithasaverybroadapplicationprospects.BaosteelTechnologyCenterisfocusedontheresearchanddevelopmentofthistechnology.Astechnologyadvances,industrialapplicationsispossible.

简介：Consideringrollelasticflattening,newequationswereproposedtocalculatetheaveragestrainεand·averagestrainrateεinthehotstriprollingprocess.Bycomparingtheproposedequationswithcurrentlyusedequations,itwasobservedthatthestrainrateofthickstripandstrainarenotsensitivetorollelasticflattening.However,forthinstrip,anoticeablecalculateddifferenceinthestrainrateoccurredwhenrollelasticflatteningwasconsidered.

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