教师杨宏智教授

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1、ManufacturingEngineeringTechnologyMetalCasting:Design,MaterialsandEconomics授課教師：楊宏智教授1【本著作除另有註明外，採取創用CC「姓名標示－非商業性－相同方式分享」台灣3.0版授權釋出】【本著作除另有註明外，採取創用CC「姓名標示－非商業性－相同方式分享」台灣3.0版授權釋出】【本著作除另有註明外，採取創用CC「姓名標示－非商業性－相同方式分享」台灣3.0版授權釋出】ManufacturingEngineeringTechnology機械製造楊宏智（台大機械系教授

2、）2ChapterOutlineIntroductionDesignConsiderationsinCastingEconomicsofCastingIntroductionSuccessfulcastingpracticerequirespropercontrolofalargenumberofvariablesFlowofthemoltenmetalinthemoldcavities,thegatingsystems,therateofcooling,andthegasesevolvedwouldinfluencethequalityo

3、facastingDesignConsiderationsinCastingAllcastingoperationssharethecharacteristicsofphasechangeandthermalshrinkageduringthecastingcycleButeachprocesswillhaveitsowndesignconsiderationsSandcastingwillrequiremolderosionandsandinclusionsinthecastingDiecastingwillnothavethisconc

4、ernDefectsfrequentlyarerandomanddifficulttoreproduceDesignConsiderationsinCasting:GeneralDesignConsiderationsforCastings2typesofdesignissuesincasting:GeometricfeaturesandtolerancesincorporatedintothepartMoldfeaturesthatareneededtoproducethedesiredcastingDesignConsideration

5、sinCasting:GeneralDesignConsiderationsforCastingsDesignofCastPartsCorners,angles,andsectionthicknessFlatareasShrinkageDraftDimensionaltolerancesLetteringandmarkingsFinishingoperationsDesignConsiderationsinCasting:GeneralDesignConsiderationsforCastingsLocatingthePartingLine

6、Partinglineisthelineorplaneseparatingtheupper(cope)andlower(drag)halvesofmoldsPartinglineshouldbealongaflatplaneratherthanbecontouredLocationisimportantasitinfluencesmolddesign,easeofmolding,numberandshapeofcoresrequired,methodofsupportandthegatingsystemPartinglineshouldbe

7、lowforlessdensemetalsandlocatedatmid-heightfordensermetalsDesignConsiderationsinCasting:GeneralDesignConsiderationsforCastingsLocatingandDesigningGatesMultiplegatesarepreferableGatesshouldfeedintothicksectionsofcastingsAfilletshouldbeusedGateclosesttothesprueshouldbeplaced

8、sufficientlyfarawayfromthesprueMinimumgatelengthshouldbe3to5timesthegatediameterCurvedgat