326-paper-roll contour optimization for cold temper mill

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