简介:Inthispaper,zirconiaisusedastopmoldmaterialforTiinvestmentcasting.Topmoldsamplesaremadebypropermoldbuildingtechnology.Theeffectofdifferentsinteringtemperatureonchemicalcomposition,microstructureandresidualbendingstrengthofthetopmoldsampleisstudied.Thevolumeandhomogeneityoftheairholesinthetopmoldaredeterminedbysinteringtemperature,andfinallydeterminedtheresidualbendingstrengthofthemoldsamplewasdetermined.
简介:Basedonthetime-averagingequationsandamodifiedengineeringturbulencemodel,themoldfillingandsolidificationprocessesofcastingsareapproximatelydescribed.Thealgorithmforthecontrolequationsisbrieflyintroduced,andsomeproblemsandimprovementmethodsforthetraditionalmethodarealsopresented.Bothcalculationandtestsprovedthat,comparingwiththelaminarfluidflowandheattransfer,thesimulationresultsbyusingtheturbulencemodelareclosertotherealmoldfillingandsolidificationprocessesofcastings.