设计和制造作业帮助.pptx

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Problem1:Whatarethedesignconsiderationsinreplacingametalcontainerforcarbonatedbeverageswithplasticbottles?Thinkaboutthefunctionalrequirementsandexplainhowthedesignofaplasticcontainerdiffersfromthatofametalcan.Solution:Whilethefunctionalrequirements,naturally,arealmostthesameformetalandplasticcontainers(remember:functionalrequirementsare“whatyouwant”andsolutionneutral),thedesignparameterstofulfillthefunctionalrequirementsmaydiffer.Inparticularthefollowingdifferencescanbestated:Sinceplasticisacheapmaterialandlessdensethanmetal,theurgeforamaterialsavingdesignisnotasstrongaswhenusingaluminum.Specialattentionhastobepaidtothepermeabilityofplastic.Inordertoconservethegasforalongperiodoftime(lessthan15%lossin120days,fromthelecture),aspecialprocessingwithlowpermeabilityplasticisnecessary.Plasticisnotasstrongasmetal.Thewallthicknesscanbeincreased,smallcorrugationor,better,awavystructure(likesmallcokebottles)canbeused.Thebottomisusuallythicktoproviderigidityandasavestand.Becauseplasticiseasiertoformintocomplicatedshapesthancans,itbecamemorefeasibletomakethemmoreaestheticallyandergonomicallypleasing;hence,sodainbottlesagain,butnowwithgrippysides.Alsoscalingupthesizeisfeasible.Inprinciple,plasticdidn’teatthatmuchofAlcans,butreplacedmostoftheglassbottles.

Problem2:ConsidertheinjectionmoldedL-bracketmadeofPolycarbonateshowninFigure1.Youareaskedtofindthemolddesignwiththepartinglinethatleadstotheminimumpossibleclampingforcetomoldthepart.Whatwouldbetheminimumclampingforcerequiredforthispart?Indicatethelocationofgateandthelocationofpartingline/planefortheminimumclampingforcedesign.Assumethatthepeakinjectionp