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1、RollContourOptimizationfColdTemperMillJiangZhenglian(ColdRollingPlantofBaosteelBranchShanghai200941China)Abstract:Astudyontheperfmanceofstripshapecontrolhasbeencarriedoutfa2000mmsinglestcoldtempermill.Thetheeticalmodelfr
2、ollcontouroptimizationwassetupwithrollelasticdefmationrolledstripplasticdefmationincluded.anoptimizedrollcontourhasbeenfinallydesignedputintoproduction.Theresultsshowthattheapplicationofnewrollcontourcanadapttothevariedr
3、olledstripwidthtoobtainlargerstripshapecontrolrangehigherstripshapequality.Keywds:OptimizedrollcontourColdtempermillStripshape0IntroductionWiththeincreasingdemonhighstripshapequalityproductfromcustomerssomespecialproduct
4、withstrictrequirementfstripshapecannotbeobtainedeasily.Suchthinghappenedtoasinglestcoldtempermillinplant.Stripshapestatisticsindicatethatthewavenessheightthroughoutthewholecoilisusuallyaround2mmexceptcoiltailheadpartwhic
5、his50~80meterapartfromtailheadseparately(asshowninfigure1a).Whensuchadefectivestripcoilisunwoundinthenextprocesslineitcanbemeasuredfthecoilheadtailwavenessheight.Inthewstcasethewavenessheightinthecoilheadismethan10mm(fig
6、ure1b).Thisisunacceptabletosomecustomers.Tocopewiththisproblemastudyontheperfmanceofstripshapecontrolhasbeencarriedoutfthecoldtempermill.CountPercentwave2mmCount61.299.0100.01911183Percent61.237.81.0Cum%Othercoil_head_wa
7、venesscoil_tail_waveness350300250200150100500100806040200Paretotofwavenessheight2mm(a)(b)Figure1Stripshapestatisticsfstripcoilrolledthroughthecoldtempermill1RollContouroptimizationcoilheadwavenessheightmmFrequency1413121
8、11092520151050Mean11.38StDev1.069N63Histogram(withNmalCurve)ofwavenessheightCommonlyusednumericalanalysisfthecalculationofrollelasticdefmationincludesinfluencecoefficientmethodFEMmethod2.Thecomputingspeedfthefmerisfaster
9、butprecisionisinferitothelatter.AlthoughtheprecisioncanbeguaranteedbyFEMmethodthereislimitationfitsspeedespeciallyfthreedimensionalFEManalysis.Frollcontouroptimizationagreatamountofrollingconditionsshouldbeconsideredcalc
10、ulated.It’sobviousthattraditionalthreedimensionalFEMmethodisnotpractical.AsfthemodelsimulationdevelopedhereittakesonlylessthanonesecondtocalculateamostcomplexcasewithacommonPCdesktopwhereasitwilltakemethanfivehourstocalc
11、ulateamostsimplecasewiththewellknownANSYSFEMsoftwarepackage.BycomparisonbetweenrealplantdatatheresultsfromANSYSmodelcalculationthedevelopedmodelshowshighprecision.2SimulationanalysisIndertoverifythesuperiityoftheoptimize
12、drollFEMsimulationhasbeenperfmedwiththeaidofthetwodimensionalmodifiedFEMmodel.Differentrollingconditionsareconsideredtocomparethedifferencebetweennmalbackuprolloptimizedone.2.1LoadedrollgaptransversestiffnessLoadedrollga
13、ptransversestiffnessindicatestheruleoftheloadedrollgapcrownvaryingwithrollingfce.Asshowninfigure4theloadedrollgapcrownisincreasedwithrollingfce.theeffectofrollingfcetoloadedrollgapcrownislessftheoptimizedbackuprollcasewh
14、ichimpliestheoptimizedbackuprollismesuitablefrollinghighstrengthsteel.(a)(b)Figure4Loadedrollgaptransversestiffness2.2BendingfceadjustmenteffectBendingfceadjustmenteffectindicatesthecapabilityofrollbendingtoimprovestrips
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