拼焊板U形弯曲成形及回弹数值模拟研究

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1、AbstractWithdevelopmentoftechnologyandenvironmentalneeds,toachievelightweightvehicles,hasbecometheinevitabledevelopmenttrendoftheautomotiveindustry.Thetailor-weldedblanksplayaimportantroleinlowingpowerandimprovingproperty,sotheformingofTailor-weldedbalnkstechnologyhasbecometheresearchfocus

2、.Intailor-weledblankbendingprocess,springbackisthemainformingdefects,whichseriouslyaffectthedimensionalaccuracyofparts.Therefore,thestudyofspringbackinthebendingprocessisveryimportant.Thespringbackoftailor-weldedblanksbendingisnotonlyaffectedofdifferencesoftwoblanks，properties,butalsomater

3、ialchangesofheat-affactedzoneandweldandthemovementofweldline.Therefore,thestudyofspringbackhavegreatsignificanceforthefurtherunderstandingofcharacteristicsoftailorweldedblanksbendingprocessandformulatefavorabalebendingprocess.Withthedevelopmentofcomputerandthematurityofthefiniteelementmeth

4、od,thenumericalsimulationofsheetmetalforminghasbeenwidelyusedinrecentyears.Usingnumericalsimulationmethodcanbemoreaccurateresearchthemoldparametersandmaterialproperties,thicknessdifferenceandotherfactorsontheimpactoftheformingprocessoftailor-weldedblanksanditsspringback.Inthispaper,forthet

5、ailor-weldedblanksU・bendingproblem,itusetheFEMsoftwareETA-Dynaformtoanalysistheformingprocessandspringback・Thispaperanalysisthetransverseandlongitudinaltailor-weldedblanksofCap-shapebendingprocessandtransversetailor-weldedbalnksU-freebendingprocess.Analyzinginfluenceoftheweld-line"moldinga

6、ndblanks5holdingmethodonforming,achievedarightmoldingmethod.Usingthismethodtoanalyzingtheinfluenceunderdifferentparametersoftransverseandlongitudinaltailor-weldedblanksformingprocessanditsspringback,GotthatU-shapedbendingcharacteristicsofdifferenttypesoftailorweldedblanksandthemainfactorso

7、fspringback.Proposingamethodtolimitweld-linemovementandeliminatespringback.KeywordsTailor-weldedblanks;U-Bending;Numericalsimulation;Springback;Weld-linemovementin摘要T1^1-Abstract第I章绪论1.1引言1.2拼焊板成形技术及其应用1.3国内外研究现状1.4课题研究的主要内容和方法第2章拼焊板弯曲成形的数值模拟方案2]引言2.2Dynaform软