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1、铝合金铸造工艺性能（Aluminumalloycastingprocessperformance）1.AluminumalloycastingprocessperformanceTheperformanceofaluminumalloycastingisgenerallyunderstoodasthesynthesisofthoseperformancesthataremostprominentintheprocessofcasting,crystallizationandcooling.Liquidity,shrinkage,airt
2、ightness,castingstress,inhalation.Thepropertiesofaluminumalloyaredependentonthecompositionofthealloy,butitisalsorelatedtocastingfactors,heatingtemperatureofalloy,complexityofcastingtype,pouringgatesystemandshapeofgate.(1)liquidityLiquidityistheabilityofthealloyliquidtofi
3、llcasting.Theamountofliquiditydetermineswhetherthealloycancastcomplexcastings.Itisbesttobeliquidinaluminumalloy.Therearemanyinfluencefactorsinliquidity,mainlyexistinthecomposition,temperature,andalloyliquidmetaloxides,metalcompoundsandotherpollutantsofsolidphasedparticle
4、s,buttherootoftheexternalfactorsforthepouringtemperatureandpouringpressure(commonlyknownaspouringhead).(2)systolicContractibilityisoneofthemaincharacteristicsofcastaluminumalloy.Generallyspeaking,thealloyismadefromliquidtosolidifieduntilitiscoldtoroomtemperature,whichisd
5、ividedintothreestages,whichareliquidshrinkage,solidificationcontractionandsolidcontraction.Thecontractionofalloyhasadecisiveinfluenceoncastingquality,whichaffectsthesizeofshrinkagecavity,theproductionofstress,theformationofcrackandthechangeofsize.Theshrinkageofthecasting
6、isusuallydividedintocontractionandcontractionofthebody,andthecontractionofthealloyismeasuredintheactualproduction.Aluminumalloyshrinkage,usuallyexpressedasapercentage,iscalledshrinkage.(1)bodycontractionThecontractionofthebodyincludesthecontractionoftheliquidandthecontra
7、ctionofsolidification.Castingalloyliquidfromcastingtosolidification,canappearinthelastsolidificationplacemacroscopicormicroscopicshrinkage,themacroscopicshrinkagecavitycausedbyshrinkagevisibletothenakedeye,andcanbedividedintocentralizedshrinkagecavityanddispersionshrinka
8、gecavity.Theporediameteroftheconcentratedshrinkagecavityislargeandconcentrated,andisdistributedinthehot
