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

  • 标签: 高强度钢 汽车零部件 技术支持 轻量化设计 轧辊 成形过程
  • 简介:ThemetalsprayformingprocesswasexaminedusingmathematicalsimulationandverifiedthroughtheprototypingevaluationatBaosteel'stestanddevelopmentfacilities.Themathematicalmodelcomprisedoffoursections,includingjetgasflowinthedepositionchamber;singledropletbehavioralongitstrajectorypath;probabilityandstatisticalanalysisofdropletmassbehavior,andforecastoftheshapeandtemperaturedistributionofthebilletduringthesprayformingprocess.

  • 标签: 金属喷涂 数学建模 实验 成形过程 数学模拟 气体流量
  • 简介:Inthisstudy,theformabilityoftransformation-inducedplasticity(TRIP)steelisstudiedduringdeep-drawingprocesseswithpreforming.Theeffectsofpreformingontheminimumthicknessofcanareinvestigatedwithaconstitutivemodelaccompanyingstrain-inducedmartensitetransformationinprestraincondition.TheconstitutivemodelhasbeenimplementedintoABAQUS/UMATforanalysisofTRIPsteel-formingprocesses.TheresultsshowthatpreformingslightlyinfluencesthethicknessuniformityofTRIPsteel...

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  • 简介:Sprayformingisanewtypeofmetalmaterialformingprocess,whichcanproducemetalblankssuchasbillet,tube,plateetc.Amathematicalmodelhasbeendevelopedtoforecasttheshapeevolutionoftubebilletsduringthesprayformingprocess.Theatomizermassfluxas,radialdistributioncoefficientbs,drawvelocityanddiameterofmandrelwereconsideredinthismodelandtheinfluenceofdifferentparameterssuchasmetalflowrate,drawvelocityofmandrel,diameterofmandrelonthetube'sshapechangeweresimulatedandanalyzedinthispaper.Thesimulationresultsobtainedfromthismodelcanbeprovidedtoengineersasreference.

  • 标签: 喷射成形 数值模拟 成形过程 个人资料 金属材料 数学模型
  • 简介:Springbackisconsideredtobeoneofthemostimportantproblemsinaluminumsheetstampforming,leadingtodeviationfromthedesignedtargetshapeandassemblydefects.Inthisstudy,aspringbacksimulationmodelbasedonthebenchmarkofaJaguarLandRoveraluminumpanelisestablished.Weembedseveralelastoplasticconstitutivemodels(Barlat's89,Barlat'sYLD2000,Yoshida-Uemori(YU)+Barlat's89,andYU+Barlat'sYLD2000)inthefiniteelementmodel,inordertodiscusstheinfluenceoftheconstitutivemodelselectiononspringbackpredictioninaluminumsheetforming.

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  • 简介:Thetensilebehaviorandpropertiesofcoldformedlow-carbonmicroalloyedsteelwithitsmicrostructureofallferriteandpearlite(F+P)wereinvestigated.Bendingandflatteningdeformationswerecarriedoutinthelaboratoryonhot-rolledsheetsinordertosimulatethecoldformingprocessofsteelsheetsduringpipefabricationandsamplingofhighfrequencystraightbeadweldingpipes.Acomparisonofthetensilebehaviorandpropertiesofthematerialmadebeforeandaftercoldformingindicatesthatcolddeformationaltersthetensilebehaviorandpropertiesofthematerialtoacertaindegreedependingonthemannerofthecolddeformationandthedegree.TheresearchontheBauschingereffectindicatesthatforthesteelsinvestigated,whentheplasticstrainissmall,thebackstressincreasesrapidlywiththeincreaseoftheplasticstrainandthenrapidlytendstosaturation.ThefiniteelementanalysisindicatesthatthechangeinthepropertiesofthesteelsheetsduetocoldformingisaresultoftheBauschingereffectandworkhardening.Themechanismofthechangeinthepropertiesisalsogiveninthisstudy.

  • 标签: 拉伸行为 钢性能 微合金 低碳 材料性能 塑性应变
  • 简介:BasedontheABAQUSexplicitdynamicsimulationplatform,thefiniteelementmodelofsinglestandmillwithrestrainedmandrelwasadoptedtoresearchtheinfluenceofmandrel-rollervelocityratio(MRVR),mandrelfrictionandtensionbetweenstandsonrollingforce.TheanalysisresultsshowthatwhentheMRVRislowerthan1,therollingforceincreasesobviouslywiththeincreaseofMRVRandreachesthepeakvaluewhentheMRVRisabout1.TherollingforceincreaseinducedbytheMRVRincreaseisthemainreasonoftheformationofthebulgedefectonthetubeheadandtailattheenteringandexitingstageduringtubecontinuousrollingprocessbyfullfloatingmandrelmill,whichcanbeintensifiedbytheincreaseofmandrelfrictioncoefficient.Therollingforcedecreaseswiththeincreaseoftension.Asthetensionislarger,therollingforcedecreaseamplitudeislarger.Theinfluenceofbackwardtensiononrollingforceisgreaterthanthatofforwardtensiondistinctly.TensioncontrolcanbeusedtodecreasetherollingforceincreaseinducedbytheMRVRincrease,whichisimposingtensionatthesametimewhentheMRVRincreases,inordertoimproveeveneliminatethebulgedefect,andenhancethetubedimensionprecision.

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