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1、意義發(fā)展歷程(Meaningdevelopmentcourse)CADtechnologyoriginatedintheUnitedStates,andithasexperiencedaprocessfromtwo~dimensiona1designtechnologytothree-dimensionaldesigntechnology.TwodimensionalmechanicalCADtechnologyearlyisactuallyacomputeraideddrawing(ComputerAidedDr
2、afting),itjustplaysaroleintheelectronicboard,becausethetwo-dimensionalmechanicalCADtechnologycannotwellsolveseveralproblems,suchas:themostdifficultinthedesignofprojectionlinecomplexproblems,aleakagemechanismanalysisoftherelationshipbetweenthegeometricsizethere
3、lationshipbetweenmotionandscalingproblems,leakageproblems,drawinglinediscussion,designupdateandmodificationproblem,designprojectmanagementetc??So,2DmechanicalCADdoesn，tplayarealroleincomputer-aideddesign.Infact,peopleinthedesignofpartsofthethinkingisthree-dime
4、nsional,isassociatedwiththecolor,material,hardness,shape,size,locationandrelatedparts,manufacturingprocessandotherconcepts,evenwiththemovementrelationisquitecomplex,justasthepreviouslimitedmeans,peoplemaynotagreethe2Dviewinthefirstquadrantorthographicprojectio
5、nexpressionrules,expressingtheirownideaswithfinitedimensionalassociatedtwo-dimensionalprojection?Usually,theexpressionofinformationisveryincompletedrawing,anddrawingandreadingtotrainedpeopleto"correct"thehumanmindintheoriginal,ageometricexpressionof"mistakes",
6、sothereisanurgentdesireto3DCADtechnology.ThreedimensionalCADtechnologyconformstohumandesignthinkinghabits,thewholedesignprocesscanbecompletelydiscussedinthree-dimensionalmodel,intuitiveimage.Becauseweinthemechanicaldesign,alwayshopethatwecangettobuildparts,can
7、bedisassembled,sothatwecanconstructthethree-dimensionalmodeldesigningraphicdisplay,butalsowanttokeepeveryintermediateresultsforrepeateddesignandoptimizationdesign.Andthestress/strainanalysis,qualityattributeanalysis,spatialmotionanalysis,assemblyinterferencean
8、alysis,molddesign,NCprogrammingandmanufacturabilityanalysisandtwo-dimensionalengineeringdrawingautomaticgeneration,appearanceandotherevaluationwork.Therefore,3DCADtechnologyistheCo
