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1、外文原文Traditionalcarbodyandmoderncarbodydesignmethod1、TraditionalcarbodydesignmethodTheautocarcarbodyshapeisoneofthethreegreatestfractionsthatareparalleledwithbedrockandengineintheautocarstructure,itsdevelopmentandcapacitypreparationcycleisthelongest,andthepreparationworkofchartpaperandcraftis
2、thebiggest,anditisusuallystillneedtoremodel,unlikebedrockandengineattainwhichiseasytoreachserializationandgeneralization.Thecharacteristicsofcarbodystructureliesontheconstitutionofcarbodyshapeofeachnullpartiesbebigforsizemorebutshapecomplicatedspacecurvedface(namelyso-calledpersontypeoverlay
3、piece),thesespacecurvedfacescannotbeusedordinarymachinerydrawingmethodwillitthecompleteearth'ssurfaceappear,asaresulthavetocreatestereoscopicpatternasbasis.Formakingthesechartpaperandchangeatypetangiblyexpressshapeandstructureofcarbody,needtopassacomplicateddesignprocesstocomplete.Inthetradi
4、tionalcarbodydesign,thedesigninformationandthedataofcarbodydelivermainlybytwo-dimensionalchartpaperandprincipalmodetype,therearemanydesignfractionofperson'shandwork.Thedefectsthattraditionaldesignmethodcannotovercomeembodyatasfollowsafewaspects:1、Themanpowerresourceconsumegreatly.Thetraditio
5、nalcarbodydesignsatappingrequirementtheartdesigningpersonnel,engineeringthetechnicalpersonnelanditsoperativemakeaconcertedeffort,suchasthecreationandconservancy,moldingtoolofthetwo-dimensionalengineeringchart(theplotofcarbodygraph),soilpatterndesign,production,grindtogotogetherwithandadjustt
6、otry,capacitypreparemediumprocessplanningetc.swillexpendapersonquantitativemanpowerandresource.2、Designingaccuracyislow,thecycleislong.Accuracylowandmainreason'slyingintheinformationofeachlinkthatdesignswithbornreservetodeliverisakindof“moveashape",Forexamplefromlorddraftionboardmanufacturep
7、rincipalmodeXing,iscarriedonbytheprincipalmodetypetoprocesscraftsupplement,productioncraftpattern,fromconvexofthecraftpatternturnoverintoconcavecraftpattern,againisdependedbythecraftpatternantitoprocesstrimmingdie,aftertheconvertoftheselinks,rawdat
