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Pouring mould during centrifugal casting process

Zagórski R., Śleziona J.

Archives of Materials Science and Engineering

2007

Vol. 28, nr 7

441-444

Purpose: The paper presents the model and the example simulations of the centrifugal casting of metal matrix composite reinforced with SiC, especially the distribution of the velocity of liquid composite for the initial stage of pouring the mould (up to 1s). Design/methodology/approach: Numerical simulations have been performed using the CFD program FLUENT 6.1.To simulate pouring the mould, axisymmetric swirl model has been applied. To model the air-matrix free surface (and also volume fraction of particular continuous phases) and dispersed phase, Volume of Fluid approach (VOF) and Discrete Phase Model (DPM) have been used, respectively. The turbulent flow of the fluid has been simulated by the standard k-ε model of turbulence. Findings: The results show that the behaviour of composite in pouring process depends strongly on the existence of reinforcement and process parameters and the initial stage of the casting can probably have an influence on the segregation and various final distribution of reinforcement particles. Research limitations/implications: The implemented simulational scheme can be used to study the behaviour of liquid composite during casting and the final simulational structure of composite should be verified experimentally. Practical implications: The simulation by CFD program (Fluent) can be treated as an attractive and useful tool for modelling centrifugal casting process of metal matrix composite reinforced by ceramic particles. The created model and procedures can be come the basis for more advanced researches. Originality/value: The development of CFD program and the computer technology allow to study even complicated problems. Hence, we have implemented the CFD program to simulate the centrifugal casing of composite.

Zastosowanie odlewania odśrodkowego do wykonywania cienkościennych odlewów precyzyjnych

Karwiński A., Wieliczko P., Leśniewski W.

Archiwum Odlewnictwa

2006

R. 6, nr 18/2

255--260

W artykule omówiono prace związane z wykonaniem odlewu wirnika pompy hydraulicznej przy pomocy techniki odlewania odśrodkowego. Przedstawiono dobór materiałów do wykonania matryc modelu odlewniczego oraz mas do sporządzenia form odlewniczych. Właściwy dobór materiałów pozwolił na opracowanie technologii wykonywania odlewów wirnika. Konsekwencją prac było wykonanie doświadczalnych odlewów.

The article describes the work related with manufacture of cast impellers for hydraulic pumps by the centrifugal casting process. The choice of materials used for die to make a foundry pattern was presented along with the type of materials used for foundry moulds. The proper choice of materials enabled making patterns and castings of the impeller.