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1、机械加工类中英文翻译、外文翻译——关于可机加工性的论述英文原文：OnthediscussionofthemachinabilityAbstract:Thepaperisabouttheconceptofmamufacturingengineeringandthewaysofprocessingit.Itexplainsthefoundamentalconceptofmanufacturingengineeingfromthewayofexampleandalsoofferussomekondsofmater
2、ialscanbeusedinmanifacturingengineering.Keywords:manufacturingengineering、mterial、concept译文：20.9MACHINABILITYThemachinabilityofamaterialusuallydefinedintermsoffourfactors:Surfacefinishandintegrityofthemachinedpart;Toollifeobtained;Forceandpowerrequirements
3、;Chipcontrol.Thus,goodmachinabilitygoodsurfacefinishandintegrity,longtoollife,andlowforceAndpowerrequirements.Asforchipcontrol,longandthinstringycuredchips,ifnotbrokenup,canseverelyinterferewiththecuttingoperationbybecomingentangledinthecuttingzone.Because
4、ofthecomplexnatureofcuttingoperations,itisdifficulttoestablishrelationshipsthatquantitativelydefinethemachinabilityofamaterial.Inmanufacturingplants,toollifeandsurfaceroughnessaregenerallyconsideredtobethemostimportantfactorsinmachinability.Althoughnotused
5、muchanymore,approximatemachinabilityratingsareavailableintheexamplebelow.MachinabilityOfSteelsBecausesteelsareamongthemostimportantengineeringmaterialsasnotedinChapter5,theirmachinabilityhasbeenstudiedextensively.Themachinabilityofsteelshasbeenmainlyimprov
6、edbyaddingleadandsulfurtoobtainso-calledfree-machiningsteels.ResulfurizedandRephosphorizedsteels.Sulfurinsteelsformsmanganesesulfideinclusionssecond-phaseparticles,whichactasstressraisersintheprimaryshearzone.Asaresult,thechipsproducedbreakupeasilyandaresm
7、all;thisimprovesmachinability.Thesize,shape,distribution,andconcentrationoftheseinclusionssignificantlyinfluencemachinability.Elementssuchastelluriumandselenium,whicharebothchemicallysimilartosulfur,actasinclusionmodifiersinresulfurizedsteels.Phosphorusins
8、teelshastwomajoreffects.Itstrengthenstheferrite,causingincreasedhardness.Hardersteelsresultinbetterchipformationandsurfacefinish.Notethatsoftsteelscanbedifficulttomachine,withbuilt-upedgeformationandpoorsurfa
