001 Design For Manufacturing And Assembly，44页，设计工艺准则

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1、DesignforManufacturingandAssembly•Designformanufacturing(DFM)isdesignbasedonminimizingthecostofproductionand/ortimetomarketforaproduct,whilemaintaininganappropriatelevelofquality.AprimarystrategyinDFMinvolvesminimizingthenumberofpartsinaproduct.•DesignForAs

2、sembly(DFA)involvesmakingattachmentdirectionsandmethodssimpler.KenYoussefiUCBerkeley1DFMandDFABenefitsItreducespartcounttherebyreducingcost.Ifadesigniseasiertoproduceandassemble,itcanbedoneinlesstime,soitislessexpensive.Designformanufacturingandassemblyshou

3、ldbeusedforthatreasonifnoother.Itincreasesreliability,becauseiftheproductionprocessissimplified,thenthereislessopportunityforerrors.Itgenerallyincreasesthequalityoftheproductforthesamereasonaswhyitincreasesthereliability.KenYoussefiUCBerkeley2DFMandDFA•DFMa

4、ndDFAstartswiththeformationofthedesignteamwhichtendstobemulti-disciplinary,includingengineers,manufacturingmanagers,costaccountants,andmarketingandsalesprofessionals.•Themostbasicapproachtodesignformanufacturingandassemblyistoapplydesignguidelines.•Youshoul

5、dusedesignguidelineswithanunderstandingofdesigngoals.Makesurethattheapplicationofaguidelineimprovesthedesignconceptonthosegoal.KenYoussefiUCBerkeley3DFMandDFADesignGuidelines•Minimizepartcountbyincorporatingmultiplefunctionsintosingleparts.Severalpartscould

6、befabricatedbyusingdifferentmanufacturingprocesses(sheetmetalforming,injectionmolding).Askyourselfifapartfunctioncanbeperformedbyaneighboringpart.KenYoussefiUCBerkeley4DFMandDFADesignGuidelines•Modularizemultiplepartsintosinglesub-assemblies.KenYoussefiUCBe

7、rkeley5DFMandDFADesignGuidelines•Designtoallowassemblyinopenspaces,notconfinedspaces.Donotburyimportantcomponents.KenYoussefiUCBerkeley6DFMandDFADesignGuidelines•Partsshouldeasilyindicateorientationforinsertion.Partsshouldhaveself-lockingfeaturessothatthepr

8、ecisealignmentduringassemblyisnotrequired.Or,providemarks(indentation)tomakeorientationeasier.KenYoussefiUCBerkeley7DFMandDFADesignGuidelines•Standardizepartstoreducevariety.KenYoussefiUCBerkeley8DFMan