资源描述：
《意义发展历程（Meaning development course）.doc》由会员上传分享，免费在线阅读，更多相关内容在工程资料-天天文库。
1、意义发展历程(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
