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ID:57209958
大小:2.37 MB
页数:25页
时间:2020-08-03
《Metal-casting-铸造说课材料.ppt》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、1.Metalcasting1.1Conceptofcasting1.2Castingprocess1.3Fluidflow1.4Castingdefects1.5Sandcasting1.6Investmentcasting1.7FoundryandautomationPleaserefertochapters10and11Metalcasting--keywordsCastingMoldGrainFluiditySandcasting/diecastingInvestmentcastingFoundryPat
2、tern/core/porosity/shrinkage1.1ConceptofcastingAdvantages:ComplexshapeswithinternalcavitiesorhollowsectionsVerylargepartsAlmostallmetals,suitableforworkpiecematerialsdifficulttoprocessbyothermeansCompetitivewithotherprocesses1.1ConceptofcastingApplications:Ma
3、nypartsandcomponents,forexamples…1.1ConceptofcastingTrends:MechanizationandautomationofthecastingprocessIncreasingdemandforhigh-qualitycastingswithclosedimensionaltolerancesandnodefects1.2CastingprocessCastingprocess:Pouringmoltenmetalintoamoldpatternedaftert
4、heparttobemanufactured;Allowingittocool;Removingthemetalfromthemold.1.2CastingprocessSolidificationsofmetals:PuremetalsAlloys1.2CastingprocessInfluenceofgrainsizeoncastingproperties:Strengthductilitymicro-porositytendencyforthecastingtocrack.1.3FluidflowCasti
5、ngsystem1.3FluidflowFluidity:thecapabilityofthemoltenmetaltofillmoldcavities.Influencefactorsoffluidity(1)Characteristicsofthemoltenmetal(2)Castingparameters-page249fordetailCastability:theeasewithametalcanbecasttoobtainapartwithgoodquality.Testmethodforcasta
6、bility:1.4CastingdefectsMaininfluencefactors:Materials,partdesign,processingtechniquesSevencategories:(1)metallicprojections(2)cavities--porosity(3)discontinuities(4)defectivesurface(5)Incompletecasting(6)Incorrectdimensionorshape(7)Inclusions1.4Castingdefect
7、sSeeFig.10.111.4CastingdefectsPorosity:maybecausedbyshrinkageorgasesorboth.Methodstoreduceoreliminateporosity—avoidcavitiesbyshrinkage(1)Adequateliquidmetal(2)Internalorexternalchills1.4Castingdefects----------------Readingprogram:P.256,example.1.5Sandcasting
8、Advantagesandlimitations:--SeeTable11.1,(P.8);Table11.2,(P.9)Processofsandcasting:(1)Placeapatternhavingtheshapeofthedesiredcastinginsandtomakeanimprint;(2)Incorporatingagatingsystem(3)Fi
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