机械工程专业英语论文.doc

机械工程专业英语论文.doc

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《专业英语论文考核》

专业年级机械电子141

姓名韦继虎

学号1611140109

指导教师董文彬

完成时间2017年6月10日

2

窗体顶端

ApplicationandDevelopmentofLightweightMaterialforAutomobile

窗体底端

Abstract

Carlightweightisanimportantmeanstoachieveenergy-savingemissionreductionandmethods,inimprovingthefueleconomyandenvironmentalprotectionhasanimportantrole.Atpresent,thelightweightnewmaterialisthemainwayofthecurrentbodyweightreduction,throughthemulti-materialstructureoptimization,bothtoimprovevehicleperformance,butalsosignificantlyreducethequality.Thischapterdiscussestheperformanceandapplicationofseverallightweightmaterials,describesthedevelopmentoflightweightmaterialsintheautomotiveindustryandtheapplicationofthetrend

Keywords:

automotive；lightweight；lightweightmaterials

Preface

窗体顶端

窗体顶端

Thestudyoflightweightcarisamainstreamofmoderncardesignandmanufacturing.Carlightweight,istoensurethestrengthandsafetyofthecarunderthepremiseofthecarasmuchaspossibletoreducethequalityofthepreparation,therebyenhancingthevehicle'spower,reducefuelconsumptionandreduceexhaustpollution.Datashowthatifthecartoreducethequalityof10%,fuelefficiencycanbeincreasedby6%to8%,fuelconsumptioncanbereducedby6%to10%.Fuelconsumptiondecline,emissionsalsodecreased,whileresourceutilizationincreased,extendedlifeofthecar,theuseofperformancehasimprovedsignificantly.Carbodyqualityaccountsforabout50%ofthequalityofthevehicle,itisclearthatthelightweightbodyforthevehiclelightweightplayapivotalrole[1].Atpresent,thecarbodyweightreductionhastwomainresearchdirections:

First,theuseoflightweightmaterials;Second,optimizethestructure.Structuraloptimizationpotentialspacehasbeenverysmall,thegradualuseoflightweightnewmaterialsisthecurrentbodyofoneofthemainmeansoflightweight.

1Newhighstrengthsteel

Inrecentyears,withtheprogressofmetallurgicaltechnology,onthebasisofhigh-strengthsteel,withultra-lowcarbonasthebasiccharacteristics,andgraduallyformedwithdeepdrawing,highstrength,bakinghardeningperformanceofnewhigh-strengthsteel.Atpresent,theuseofhigh-strengthautomotivebodyismainlysheetmetalandpipe.Mainly:

（1）BHsteel（bakehardeningsteel）.BHsteelplateyieldstrengthinthebakingpaintincreased,withoutlossofformabilityunderthepremiseofimprovingtheanti-depression,canreducethesteelplate,mainlyforhighstrengthanddifficulttoformparts,suchasroof,Doors,luggageandothercomponents,themainuseoftensilestrengthof340~390MPaBHsteelplate.

（2）RIPsteel（phasechangeinducedplasticsteel）.Mainlyusedforthecollisionmustabsorbmoreenergywhenthehigh-strengthstructuralparts,suchasbodyframe.（3）MSsteel（martensiticphasesteel）.Usedtohitthehighimpactparts,thatis,inaveryshortcollisiondeformationstroketoabsorbalotofenergy,suchassidecrashprotection.（4）boronsteel.Usedtorequirehighstrengthandhighdegreeofmoldingofparts,canminimizethequality.SuchasA,Bcolumnreinforcement,etc.[2].

Practicehasprovedthatwhenthethicknessofthesteelwerereduced0.05,0.10,0.15mm,thebodyweightlosswere6%,12%,18%.Intermsofdevelopmenttrends,theuseofnewhigh-strengthsteelplateinthebodyisconstantlythinning,whilethebodystrengthhasincreased,whileincreasingthesafetyofthecar,reducingnoiseandvibration,improvefuelefficiencyandreducetheoverallqualityofthecar.Thecostdidnotincrease,whiletheacceleration,drivingperformancehasimproved.Whetherfromthecostpointofview,orfromtheperformancepointofview,thenewhigh-strengthsteelplateistomeetthelightweightbodytoimprovethesafetyofthecollisionofthebestmaterials.Theproportionofnewhigh-strengthsteelplatesusedinvariousautomobilefactoriesisincreasing.Japan'sMitsubishiPajero（SPORT）forthecompany'slatestSUVcardesignedanewbodystructure,body70%ofthecomponentsmadeofhigh-strengthsteelplate,thevehicle'storsionalstiffnessevenhigherthantheGrandCherokee45%Bodycarryingcapacityofupto2tormore.Ford'sWindstarbodyframe60%ishighstrengthsteel.Toyota'snewVitzbodystructureinhigh-strengthsteelaccountedfor48%,thanthecompany'sStarletcartoreducethequalityof17kg.

However,thehighstrengthofthesteelsheetisliabletocauseadecreaseinplasticity,apoorformability,andanincreaseinyieldstrength,whichcausessurfacedistortionandspringback,andincreasestheshape'sinstability.Thus,high