外文翻译--干式薄壁套柴油机机体缸孔及缸套孔加工的探讨.doc

附录专业英语翻译StudyofDryThinWallCylinderLinerforDieselEnginecylinderBlockBoreandCylinderBoreMachiningFirstchapteroutline1.1aircylindersattritionJudgestheenginewhetherneedstheoverhaul,mainlyisdecidedbytheaircylinderwearingcapacity,theaircylinderairramgroupattritionhasHasthegrindingcompoundtowear,themolecularmachinerywears,corrodesthecharacteristicwhich-themachinerywears.Inaircylinderworkingconditionbad:Temperaturehigh,pressurehigh,ifoilfeedinsufficiencyorlubricationconditionbad,iseasytoformtheboundaryfriction,causesDonotselecthasthemetalliccontact,formstheadherency.ThehotadherencyrepairsavehicletheinitialperiodoperationalphaseinnewCheHedatobeeasytoproduce.Inordertoresistthehotadherency,mustenhancethecomponentsthemanufactureandtheassemblyqualityandthelubricatingoilquality.Thecylinderbodyifcoordinatesthepistoncurl,intheattritionquestionisaninalienablewhole,twohasdenseCutsrelation.Generallybesidesspecialmaterial,intwokindofmutualcompoundingingredientsonekind,ifwearingcapacitysmallSpeech,thenanotherkindofmaterialwearingcapacityalsoreducesalongwithit.Timetheenginecylinderbodymanufactureprecisionandtheassemblyshapepositioncommondifferenceisremarkabletothecylinderwallattritioninfluence.InThemanufactureandtheoverhaularethestrictcontrolandtheinspectionaircylinderandthemainaxlealtarholespoolthreadverticality,theaircylinderholetothemainbearingHolesite,hasthegreatsignificancetotheengineservicelife.Thecylinderwallattritionexperimentprovedthat,WhenverticalityerrorIncreasestoabove0.10mmwhenby0.05mm,thecylinderwallwearscorrespondinglyincreases30-40%；CylinderholecolumnerrorAchievedwhen0.04mm,afterexercises20,000kilometers,acylinderholecolumnerrorincreasesto0.10mm-0.12mm.Whenaninitialcolumnerrorissmallerthan0.025mm,aftermoves20,000kilometers,acylinderholecolumnerroronlyincreases0.05mm-0.06mm.1.2cylinderwallssurfacesappearanceThecylinderwallformstheoverlappingshapegroovebytoimproverubsthevice-lubricationconditionisreducestheattritiontheimportantlink.EvenGoesagainstthenetgrainhoningtobepossibletocausethecylinderwallsurfacetopresenttheclearlydiscernibleoverlappingnetgraintrench,andgroovecresthoningHasthemicroscopicplane,causestheflattoppingareatoaccountforthetotalareaabout60%,likethismayenhancethecylinderwalltheoilstorageability,Causesthecylinderwallthewearingcapacitytocomparethenon-flattoppingnetworkgrainhoningthecylindertubetoreduceabout78%.Theuseindicatedthat,carriesontheflattopThenetgrainhoning,aftertheengineexercises100,000kilometers,stillobviouslynetgraintrench.Thecylinderwallprocessingqualitytoitsattritioninfluenceremarkable,theroughsurfaceiseasytodestroythelubricantfilmcontinuity；Isnoteasyinthesmoothsurfacetopreservethelubricatingoil.Underthecertainworkingcondition,theaircylinderwearingcapacityifisroughHasthecertainrelations,thereforemustreasonablychoosethesurfaceroughness.Thematerialindicated,forpreventedpullsthecylinder,byallmeansmustThemaintenancelubricantfilm,thecylinderwallandthepistoncurlsurfaceroughnessmustfullycontrol.TheJapanesematerialbelieved,cylinderwallsurfaceRoughnesstake0.3mumassuitable,itssuperficialhoningtraceshouldformtheoilstoragesurface.TheFrenchmaterialbelieved,Regardingthelinearprecisionwork,shoulduse0.5-1.25mumtheroughness.Regardingindustryinapplicationmodelcastiron,Thecylinderwallsurfacedonothavetootobesmooth,otherwisecanhindertowearin；Butthetooroughsurfacecancausetheattritionincrease.Thereforeusuallytakesbetween0.5-1.0mum,afterwearsin,surfaceroughnessbetween0.12-0.15mum.Themodernmotorcarenginetakesinthecylindertubeextremelyintheenhancementwear-resistinglifeaspectthegrindingcompoundattrition.ExperimentaltableBright,thecylinderwalltotalwearingcapacityoneaboutthehalfisthegrindingcompoundwearsto.EliminatesenhancestheenginethefiltrationsystemfunctionOutside,intheassemblylineshipsouttheengineusuallyhasthemassivegrindingcompoundgranule,iswearingintheinitialperiod,causestheattritionSharpgrowth.Thematerialindicatedthat,theengineinstallstotheautomobileon,atfirstin100-200kilometertravellingschedule,inlubricatingoilContainsthesiliconquantitytobemost.Thereforedoeswelltheengine清洁度,toguaranteestheenginequality,thereliabilityallhasthesignificanceSignificance.1.3cylinderbodiesdistortionsThecylinderbodypossiblyappearsvariousdistortionintheuse,bringsextremelybadlytotheengineservicelifeInfluence.Thecylinderbodydistortsthereasonusuallyhasthree:Namelyinternalstress,outsideloadandtemperature.WasmadthecylinderbodyhasbeenmakingIntheregulationShangNengguaranteedthecorrectpositionandtheshapebetweenthematingsurface.ButpassesthroughperiodoftimeaftermakingontheproductionDoesnotconformtothespecificationtodistortgreatly,itsmainreasonisbecausehasnotcarriedoneffectiveactualeffectprocessingtothecastingOrtheactualeffectprocessesisimproper.Inaddition,ismadthecylinderbodyaftertheroughmachiningforcecutting,alsocanhavetheprocessinginternalstress,Alsomustincarryonatimeofactualeffectprocessing,otherwisewillbeabletohavethedistortioninthelateruseprocess.InrecentyearsinIntheoverseasresearchcomponentsdistortionmechanismliteratureproposedsomeviews,namelythoughthasthedistortionintrinsicreasonIsthematerialcrystallizationflaw,likevacancy,dislocation,alongcrystalgrainflaw,holeandothersundrygoodsandsoon.EspeciallyMaybethedislocationanditstheproliferationarethemainreasonwhichtheinfluencedistorts.1.4aircylindersandpistontoleranceclearancesTheaircylinderandthepistontoleranceclearancewithimportantlyaffectstotheengineservicelife,itisthedesign,themanufactureWithusesoneofengineimportantparameters.Believedgenerallythat,theassemblyinitialgapgatherstherunningingaptobesmaller,Coordinatesthevice-lifetobelonger.Thesmallinitialgaponlythenthroughtheenhancementprocessingprecision,reduce