Metal casting 铸造

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1、1.Metalcasting1.1Conceptofcasting1.2Castingprocess1.3Fluidflow1.4Castingdefects1.5Sandcasting1.6Investmentcasting1.7FoundryandautomationPleaserefertochapters10and11Metalcasting--keywordsCastingMoldGrainFluiditySandcasting/diecastingInvestmentcastingFoundryPattern/core/por

2、osity/shrinkage1.1ConceptofcastingCasting:processwhichinvolvespouringmoltenmetalintoamoldcavity,thenobtainstheshapeofthecavity.1.1ConceptofcastingAdvantages:ComplexshapeswithinternalcavitiesorhollowsectionsVerylargepartsAlmostallmetals,suitableforworkpiecematerialsdifficu

3、lttoprocessbyothermeansCompetitivewithotherprocesses1.1ConceptofcastingApplications:Manypartsandcomponents,forexamples…1.1ConceptofcastingTrends:MechanizationandautomationofthecastingprocessIncreasingdemandforhigh-qualitycastingswithclosedimensionaltolerancesandnodefects1

4、.2CastingprocessCastingprocess:Pouringmoltenmetalintoamoldpatternedaftertheparttobemanufactured;Allowingittocool;Removingthemetalfromthemold.1.2CastingprocessSolidificationsofmetals:PuremetalsAlloys1.2CastingprocessInfluenceofgrainsizeoncastingproperties:Strengthductility

5、micro-porositytendencyforthecastingtocrack.1.3FluidflowCastingsystem1.3FluidflowFluidity:thecapabilityofthemoltenmetaltofillmoldcavities.Influencefactorsoffluidity（1）Characteristicsofthemoltenmetal（2）Castingparameters－page249fordetailCastability:theeasewithametalcanbecast

6、toobtainapartwithgoodquality.Testmethodforcastability：1.4CastingdefectsMaininfluencefactors:Materials,partdesign,processingtechniquesSevencategories:（1）metallicprojections（2）cavities--porosity（3）discontinuities(4)defectivesurface(5)Incompletecasting(6)Incorrectdimensionor

7、shape(7)Inclusions1.4CastingdefectsSeeFig.10.111.4CastingdefectsPorosity:maybecausedbyshrinkageorgasesorboth.Methodstoreduceoreliminateporosity—avoidcavitiesbyshrinkage(1)Adequateliquidmetal(2)Internalorexternalchills1.4Castingdefects－－－－－－－－－－－－－－－－Readingprogram:P.256,e

8、xample.1.5SandcastingAdvantagesandlimitations:--SeeTable11.1,(P.8);Table11.2,(P.9)Processofsandc