机械工程专业英语论文

《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IApplicationandDevelopmentofLightweightMaterialforAutomobileAbstractCarlightweightisanimportantmeanstoachieveenergy-savingemissionreductionandmethods,inimprovingthefueleconomyandenvironmentalprotectionhasanimportantrole.Atpresent,thelightweightnewmaterialisthemainwayofthecurrentbodyweightreduction,throughthemulti-materialstructureoptimization,bothtoimprovevehicleperformance,butalsosignificantlyreducethequality.Thischapterdiscussestheperformanceandapplicationofseverallightweightmaterials,describesthedevelopmentoflightweightmaterialsintheautomotiveindustryandtheapplicationofthetrendKeywords:automotive；lightweight；lightweightmaterialsIIPrefaceThestudyoflightweightcarisamainstreamofmoderncardesignandmanufacturing.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.1NewhighstrengthsteelInrecentyears,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(martensiticIIIphasesteel).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.IV2lightalloymaterial2.1aluminumandaluminumalloyAluminumistheidealchoiceforlightweightcar,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,mainl