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

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

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,highstrengthsteelsheetsareadifficulttoformmaterial.Thermoformingtechnologyisanewtypeofhigh-strengthstampingpartsfortheadvancedmanufacturingtechnology,canbeusedtoformastrengthofupto1500MPastampingparts,includingthethermoformingprocessisstampingThefrontiertechnologyofthefieldcanbewidelyusedintheproductionoffrontandrearbumper,A-pillar,B-pillar,C-pillar,roofstructure,doorinteriorplate,dooranti-collisionbeamandothercomponents.

2lightalloymaterial

2.1aluminumandaluminumalloy

Aluminumistheidealchoiceforlightweightcar,theresourceiswide,lightweight,recycling,savingresources,absorbingimpactenergy,corrosionresistance,isthebestoverallperformanceofthebasicmaterial.Thealuminumalloyusedinthebodyismainlydeformedaluminumalloy,mainlyAI-Cu-Mgsystem（2000series）,AI-Mgsystem（5000series）,AI-Mg-Siseries（6000series）,AI-Mg-Zn-Cusystem.Which2000seriesand6000seriesisheattreatmentcanstrengthenthealloy,whilethe5000seriesisheattreatmentcannotstrengthenthealloy.Theformerthroughthecoatingdryingprocessafterthestrengthisimproved,mainlyforthebodyoutsidetheboardandotheremphasisonstrength,stiffnessofthesite,suchascarcover,hood,liftreardoor,frontfender,etc.;thelatterexcellentshape,Mainlyusedinthebodyplateandothercomplexpartsoftheshape,suchascarfloorstructureandsoon.Atpresent,lowdensity,highstrength,highelasticmodulusandsuperplasticityoftheAI-Lialloyandaluminumanti-vibrationplate,etc.hasbeengraduallyappliedtothebody.

Aluminumalloyhasgoodformability.Aluminumalloybodystructuremainlyusedaluminumextrusionprofilesasthemainbodyofthespaceframestructure,generallywithmediumandstrongaluminumcanmeettherequirements.Extrusionprofilesaremainlyhollowmaterials,inadditiontolightweight,highrigidity,hightemperaturestrength,heatresistance,corrosionresistanceisalsoverygood,andcanbewelded,surfacetreatmentandbendingprocessing.Thecurrentaluminumbodyismadeofthick-walledforgedaluminumbeams,andismoreadvantageousthanstampingthinsteelintermsofstructuralstrengthandstiffness,andtheoverallstabilityofthemechanismisbetter.Lightweightandhigh-strengthaluminumbodymoresolidthanthetraditionalsteelbody,anddonotworryaboutcorrosioncausedbythereductionofstrength[3].

Fromthealuminumpanelapplicationdevelopmenttrend,highstrength,goodformingprocessability,excellentsurfacequalityaluminumplatewillreplacethesteelplateasthemainmaterialofthecarcover.Thelate90softhe20thcentury,therehavebeenfromthehood,fenderandotherpartsofthebodyaluminumplategraduallydevelopedintothebodyalltheuseofaluminumpanelsofthecar,comparedtosteelplateby40%to50%oftheresults.EuropeandtheUnitedStatesmoredevelopedaluminumindustry,soEuropeandtheUnitedStatesinthealuminumcartogoaheadEuropeandtheUnitedStatesandJapanintheautomotiveindustrycompetitionanditsdomesticenergyandenvironmentallegislationtopromotetheaccelerationofthecarlightweight（aluminum）pace.GermanyAudiA8sedanbodyaremadeofaluminum,theframeworkofthree-dimensionalframestructure,thecoverforthealuminumstamping,wasratedasoneoftheworld'simportantscientificandtechnologicalachievementsin1994oneofthe100.Thisaluminumbodycomparedwiththesteelbody,thequalityof30%to50%,fuelconsumptionreducedby5%to8%.JapanHonda'scarbodywithaluminumalloyupto162kg,steelbodyweightlossofabout40%.AndChina'saluminumproduction,prices,thecomprehensiveimpactofthetechnicalleveloftheautomotiveindustry,makingaluminumanditsalloysstillcannotbeusedinalargenumberofcars.Increasethevariety,improvequalityandreducecosts,hasbecomeChina'saluminumprocessingindustryandtheautomotiveindustrytotheworld'sadvancedlevelofdevelopmentresearch。

Specificstrengthandspecificstiffnessofaluminummetal-basedcompositematerialsresearchanddevelopmentsuccessforthefurtherdevelopmentofautomotivelightweightprovidesaway.Germany'sKamancompanydevelopedalaminatedaluminum,theouterlayerisaluminum,themiddleisfoamaluminum,usedasbodypanels,stiffnessincreasedby10times,whilethequalityof50%.Hyundaiisdevelopingahigh-performance,high-speed,safe,comfortable,energy-savingandlow-pollutiondirection.Thedevelopmentofhigh-performanceautomotivealuminumalloyandtherecyclingofscrapautomotivematerialshasbecomeanimperativeissue.Scientificresearchandinvestmentwillbringhugeeconomicandsocialbenefits.Withtherapidsolidificationofaluminumalloy,