机械工程专业英语论文Word下载.doc

机械工程专业英语论文Word下载.doc

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姓名韦继虎

学号

指导教师董文彬

完成时间2017年6月10日

比较文学是一种以寻求人类文学共通规律和民族特色为宗旨的文学研究。

它是以世界文学的眼光，运用比较的方法，对各种文学关系进行的跨文化的研究。

一个国家或民族的文学思潮、文学运动队另一个国家或民族文学发展的影响,不同国家具体作家的相互影响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

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,andanincreaseinyield