In the Lost Foam Casting process, melting point
temperature of metal, as well as volume and rate of the foam
degradation have significant effect on the mold filling pattern.
Therefore, gas generation capacity and gas gap length are two
important parameters for modeling of mold filling time of the lost
foam casting processes. In this paper, the gas gap length at the liquidfoam
interface for a low melting point (aluminum) alloy and a high
melting point (Carbon-steel) alloy are investigated by the
photography technique. Results of the photography technique
indicated, that the gas gap length and the mold filling time are
increased with increased coating thickness and density of the foam.
The Gas gap lengths measured in aluminum and Carbon-steel,
depend on the foam density, and were approximately 4-5 and 25-60
mm, respectively. By using a new system, the gas generation
capacity for the aluminum and steel was measured. The gas
generation capacity measurements indicated that gas generation in
the Aluminum and Carbon-steel lost foam casting was about 50 CC/g
and 3200 CC/g polystyrene, respectively.
[1] S, Shivkumar, X. Yao, M. Makhlouf, "Polymer Melt Interactions during
Casting Formation in the lost foam process", Vol. 33, Scripta
Metallurgica et Materialia, 1995, PP. 39-46.
[2] J. Yang, T. Huang, J. Fu, "Study of gas pressure in EPC molds" , Vol.
128, AFS. Transactions, 1998, PP.21-26.
[3] S. Shivkumar, "Modeling of temperature losses in liquid metal during
casting formation in expendable pattern casting process", Vol. 10,
Materials Science and Technology, 1994, PP. 986-992.
[4] X. Yao, S. Shivkumar, "Molding filling characteristics in lost foam
casting process", Vol. 31, Materials science and Technology, 1997, PP.
841-846.
[5] S. L. Madorsky, S. Straus, "Thermal Degradation of Polymers", Society
of Chemical Industry (London), monograph, 1961, PP. 13-60.
[6] Y. U. Stepanov, V. G. Anuchina , V. P.Kirpichnikov, Russian Castings
production, 1967, PP. 431-435.
[7] H. S. Lee, "Forming Conditions of gray iron casting in full mold
process with unbonded sand molds", Vol. 10, AFS Transactions, 1976,
PP. 559-570.
[8] R. D. Butler, R. J. Pope, "Some factors involved in full mold casting
with unbonded sand moulds", The British foundrayman, 1964, PP. 178-
190.
[9] S. H. M. Mirbagheri, P. Davami, N. Varahram, "3D computer simulation
of melt flow in LFC process", Int J Numer Meth Eng, 2003, PP. 58: 723.
[10] P. Davami, S. H. M. Mirbagheri, "Simulation of mould filling in Lost
Foam casting", Vol. 16, Journal of Cast Metals Research, 2003, PP. 1-
12.
[11] L. Wang, S. Shivkumar, D. Apelian, "Effect of polymer degradation on
the quality of lost foam casting", Vol. 181, AFS Transactions, 1995, PP.
923-933.
[12] M. Khodai, N. Parvin, "Pressure measurement and some observation in
lost foam casting", Vol. 206, Journal of Materials Processing
Technology, 2008, PP. 1-6.
[1] S, Shivkumar, X. Yao, M. Makhlouf, "Polymer Melt Interactions during
Casting Formation in the lost foam process", Vol. 33, Scripta
Metallurgica et Materialia, 1995, PP. 39-46.
[2] J. Yang, T. Huang, J. Fu, "Study of gas pressure in EPC molds" , Vol.
128, AFS. Transactions, 1998, PP.21-26.
[3] S. Shivkumar, "Modeling of temperature losses in liquid metal during
casting formation in expendable pattern casting process", Vol. 10,
Materials Science and Technology, 1994, PP. 986-992.
[4] X. Yao, S. Shivkumar, "Molding filling characteristics in lost foam
casting process", Vol. 31, Materials science and Technology, 1997, PP.
841-846.
[5] S. L. Madorsky, S. Straus, "Thermal Degradation of Polymers", Society
of Chemical Industry (London), monograph, 1961, PP. 13-60.
[6] Y. U. Stepanov, V. G. Anuchina , V. P.Kirpichnikov, Russian Castings
production, 1967, PP. 431-435.
[7] H. S. Lee, "Forming Conditions of gray iron casting in full mold
process with unbonded sand molds", Vol. 10, AFS Transactions, 1976,
PP. 559-570.
[8] R. D. Butler, R. J. Pope, "Some factors involved in full mold casting
with unbonded sand moulds", The British foundrayman, 1964, PP. 178-
190.
[9] S. H. M. Mirbagheri, P. Davami, N. Varahram, "3D computer simulation
of melt flow in LFC process", Int J Numer Meth Eng, 2003, PP. 58: 723.
[10] P. Davami, S. H. M. Mirbagheri, "Simulation of mould filling in Lost
Foam casting", Vol. 16, Journal of Cast Metals Research, 2003, PP. 1-
12.
[11] L. Wang, S. Shivkumar, D. Apelian, "Effect of polymer degradation on
the quality of lost foam casting", Vol. 181, AFS Transactions, 1995, PP.
923-933.
[12] M. Khodai, N. Parvin, "Pressure measurement and some observation in
lost foam casting", Vol. 206, Journal of Materials Processing
Technology, 2008, PP. 1-6.
@article{"International Journal of Chemical, Materials and Biomolecular Sciences:55245", author = "M. Khodai and S. M. H. Mirbagheri", title = "Behavior of Generated Gas in Lost Foam Casting", abstract = "In the Lost Foam Casting process, melting point
temperature of metal, as well as volume and rate of the foam
degradation have significant effect on the mold filling pattern.
Therefore, gas generation capacity and gas gap length are two
important parameters for modeling of mold filling time of the lost
foam casting processes. In this paper, the gas gap length at the liquidfoam
interface for a low melting point (aluminum) alloy and a high
melting point (Carbon-steel) alloy are investigated by the
photography technique. Results of the photography technique
indicated, that the gas gap length and the mold filling time are
increased with increased coating thickness and density of the foam.
The Gas gap lengths measured in aluminum and Carbon-steel,
depend on the foam density, and were approximately 4-5 and 25-60
mm, respectively. By using a new system, the gas generation
capacity for the aluminum and steel was measured. The gas
generation capacity measurements indicated that gas generation in
the Aluminum and Carbon-steel lost foam casting was about 50 CC/g
and 3200 CC/g polystyrene, respectively.", keywords = "gas gap, lost foam casting, photographytechnique.", volume = "5", number = "2", pages = "152-5", }