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Precision casting, also called investment casting
It has high production flexibility and is well-adapted. It can be used for mass production, small-scaled production and single-piece production.
2019-07-10
What materials to be used in precision casting?
In precision casting, we can use stainless steel, carbon steel and alloy steel which can be used for precision casting. Specific conditions prevail for selection.
2019-08-02
Precision casting---factors affecting dimensional accuracy of precision casting parts
Factorsaffectingdimensionalaccuracyofprecisioncastingparts:Undernormalcircumstances,dimensionalaccuracyofprecisioncastingpartsisaffectedbymultiplefactorsincludingcastingstructure,castingtexture,molding,shell,roastingandpouring.Unreasonablesetupandoperationofanylinkwouldbringtochangesofshrinkingpercentageofcastingandhenceleadtodeviationofdimensionalprecisionfromwhatisrequired.Factorsprobablygivingrisetodefectsofdimensionalaccuracyarelistedbelow:(1)Influenceofcastingstructure:a.castingsectionthicknessleadstohighshrinkingpercentage;thincastingsectionleadstolowshrinkingpercentage;b.Highfreeshrinkingpercentageleadstolowhindranceshrinkingpercentage.(2)Influenceofcastingtexture:a.Highcontentofcarboninmaterialsleadtolowlinearshrinkingpercentage;lowcontentofcarboninmaterialsleadtohighlinearshrinkingpercentage;b.Castingshrinkageratiosofcommonly-seentexturesare:castingshrinkageratioK=K=(LM-LJ)/LJ×100%.LMissizeofmoldcavity,LJiscastingsize.Kisaffectedbythefollowingfactors:waxpatternK1,castingstructureK2,varietyofalloyK3andpouringtemperatureK4.(3)Influenceofmoudlingoncastinglinearshrinkageratio:a.Amongwaxpatternmakingtemperature,waspatternmakingpressureandholduptime,waxpatternmakingtemperatureexertsthemostevidentinfluenceonsizeoffiremoldfollowedbywaxpatternmakingpressure.Holduptimeexertslittleaffectonthefinalsizeoffiredmoldafterensuringfiredmoldmolding.B.Linearshrinkagerateofwax(reclaimwax)isaround0.0-1.1%.c.Whenfiredmoldisstored,shrinkageisfurtherintensifiedandtheshrinkageisaround10%oftotalshrinkageamount,butafteritisstoredfor12hours,sizeofthefiredmoldisbasicallystable.d.Radialshrinkageratiooffiredmoldis30-40%andinfluenceonfreeshrinkageratiobywaxpatternmakingtemperatureisfarhigherthanitsinfluenceonhindranceshrinkagerate(bestwaxpatternmakingtemperatureis57-59℃andhighertemperatureleadstobiggershrinkage).(4)Influenceofshellmaterials:itadoptszirconsand,n.zirconpowder,precisioncastingsandandprecisioncastingpowder.Itcanbeneglectedasitsswellingcoefficientislowat4.6×10-6/℃.(5)Influenceofshellroasting:astheswellingcoefficientofshellislowanditisonly0.053%whentheshelltemperaturereaches1150℃,soitcanbeneglected.(6)Influenceofcastingtemperature:highercastingtemperatureleadstohighershrinkagerate;lowcastingtemperatureleadstolowshrinkagerate,socastingtemperatureshouldbeappropriate.
2018-11-24
Development prospects of precision casting
Metalmaterialsinprecisioncastingcompaniesareprimarilystemmedfrompurchasedmaterialsandwastecastingandcastingheadofthecompany.Purchasedmetalsareusuallyladeninbulkandfewarepressedtocylinders.Materialsofdifferenttexturestendtobemixedup,forexample,316materialsaremixedwith304or430materials.Soprecisioncastingcompaniesshouldtrypurchasingmaterialspressedtocylindersandconductanalysisonchemicalcomponentsofeachbatchofprocuredmaterialswithspectrumanalyzer.Ifconditionsallowit,theyshouldmakeafieldinvestigationonthesupplierstoassesswhethertheirmaterialsareidentified,protectedandstoredunderquarantine.Derusting,degreasing,cleaninganddryingdisposalneedstobedoneonwastesteel(wastecasting,castinghead)ofthecompanytocontrolSandPcomponent.Moreover,wastesteelofdifferenttexturesshouldbeidentified,protectedandstoredinquarantineandcannotbemixedup.
2019-02-22
Comparative characteristics of precision casting form
Metalmaterialsinprecisioncastingcompaniesareprimarilystemmedfrompurchasedmaterialsandwastecastingandcastingheadofthecompany.Purchasedmetalsareusuallyladeninbulkandfewarepressedtocylinders.Materialsofdifferenttexturestendtobemixedup,forexample,316materialsaremixedwith304or430materials.Soprecisioncastingcompaniesshouldtrypurchasingmaterialspressedtocylindersandconductanalysisonchemicalcomponentsofeachbatchofprocuredmaterialswithspectrumanalyzer.Ifconditionsallowit,theyshouldmakeafieldinvestigationonthesupplierstoassesswhethertheirmaterialsareidentified,protectedandstoredunderquarantine.Derusting,degreasing,cleaninganddryingdisposalneedstobedoneonwastesteel(wastecasting,castinghead)ofthecompanytocontrolSandPcomponent.Moreover,wastesteelofdifferenttexturesshouldbeidentified,protectedandstoredinquarantineandcannotbemixedup.
2018-07-24
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