Abstract
In this investigation a new model was developed to calculate gas pressure at the melt/foam interface (Gap) resulting from foam degradation during mould filling in the lost foam casting (LFC) process. Different aspects of the process, such as foam degradation, gas elimination, transient mass, heat transfer, and permeability of the refractory coating were incorporated into this model. A computational fluid dynamic (CFD) code was developed based on the numerical technique of the SOLution Algorithm-Volume of Fluid (SOLA-VOF) utilizing model, for the simulation and prediction of the fluid flow in the LFC process. In order to verify the computational results of the simulation, a thin plate of grey iron was poured into a transparent foam mould. The mould filling process was recorded using a 16 mm high-speed camera. Images were analysed frame by frame, in order to measuring foam depolymerization rate and the gap volume during mould filling. Comparison between the experimental method and the simulation results, for the LFC filling sequence, has shown a good agreement.
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References
R. M. Monroe, “Expendable Patterns Casting” (American Foundry-Man's Society Inc., 1992) p. 84.
C. H. Tseng, “A Study of the Mould Filling Parameters in the Evaporative Pattern Casting Process,” Ph.D. Thesis, Missouri-Rolla University, USA, 1991.
Ø. Nielsen, B. Applaire and H. Combeau, Metall. Mater. Trans. A 32A (2001) 2049.
A. J. Duncan and Q. Han, ibid. B 30B (1999) 7745.
Y. Sun, D. Askeland and H. Tsai, AFS Transaction 98 (1992) 308.
Y. Sun, H. Tsai and D. Askeland, ibid. 104 (1996) 271.
L. Wang, S. Shivkumar and D. Apelian, ibid. 181 (1990) 923.
J. Zhu, I. Ohanka and Y. Yoshioka, J. Jpn Foundry Engng. Soc. 72 (2000) 715.
J. Yang, T. Huang and J. Fu, AFS Transaction 128 (1998) 21.
Y. Liu, S. I. Bakhtiyarov and R. A. Overleft, J. Mater. Sci. 37 (2002) 2997.
I. Ohnaka, in Proceeding of the 6th International Conference on Modelling of Casting, Welding and Advance Solidification, edited by T. S. Piwonka et al. (MMMS, 1993) p. 337.
B. D. Nichols and C. W. Hirt, Flow Science, inc. Available at http://www.flow3d.com.
P. Davami and S. M. H. Mirbagheri, Available at http://www.sutcast.com.
S. H. M. Mirbagheri, P. Davami and N. Varahram, Intern. J. Numer. Meth. Engng. (2002) (accepted).
C. M. Wang, J. Paul and J. Huey, in Proceeding of the 6th International Conference on Modelling of Casting, Welding and Advance Solidification, edited by T.S Piwonka et al. (MMMS, 1993) p. 477.
S. M. H. Mirbagheri, “Computer Simulation Fluid Flow in LFC Mould Cavity Casting by Finite Difference Method,” Ph.D. Thesis, Sharif University of Technology, Iran, 2003 (In English).
C. W. Hirt and B. D. Nichols, J. Computational Physic 39 (1981) 201.
M. D. Torrey, L. D. Cloutman and C. W. Hirt, “NASA-VOF2D: A Computer Program for Incompressible Flows with Free Surfaces,” Technical Report LA10642-MS, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (1985).
M. D. Torrey, R. C. Mjolsness and L. R. Stein, “NASA-VOF3D: A Three-Dimensional Computer Program for Incompressible Flow with Free Surface,” Technical Report LA11009-MS, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (1987).
S. D. Elliot, “Fluid Flows Aspects of Solidification Modelling: Simulation of Low-Pressure Die-casting” Ph.D. Thesis, Queens Land University, USA, 1999.
S. I. Bakhtiarov and A. Overfelt, AFS Transaction 28 (2001) 271.
H. S. Lee, ibid. 78 (1978) 550.
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Mirbagheri, S.H.M., Silk, J.R. & Davami, P. Modelling of foam degradation in lost foam casting process. Journal of Materials Science 39, 4593–4603 (2004). https://doi.org/10.1023/B:JMSC.0000034154.00641.0b
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DOI: https://doi.org/10.1023/B:JMSC.0000034154.00641.0b