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Abstract

Disposable foundry models constitute an increasingly important role in a unitary large-size foundry. These models have many benefits, but technologies using such materials require an understanding of degradation kinetics at the time of filling. The studies presented in the article determine the size of the polystyrene combustion products used for disposable foundry models. The results were obtained by carrying out the combustion process of the polystyrene model in a special combustion chamber, in different configurations. The pressures generated during thermal degradation vary depending on process parameters such as model density or the use of an additional adhesive binder. The results of laboratory tests may suggest what values of pressure are generated when filling in full-mold and lost foam technologies. The studies provide a prelude to further analysis of materials used for disposable foundry models and quantitative evaluation of their thermal degradation products for computer simulation.
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Bibliography

[1] Pacyniak, T. (2013). Full mold casting. Selected aspects. Lodz: A Series of Monographs, Lodz University of Technology. (in Polish)
[2] Pysz, S., Żółkiewicz, Z., Żuczek, R., Maniowski, Z., Sierant, Z., Młyński, M. (2010). Simulation studies of mould filling conditions with molten metal in evaporative pattern technology. The Transactions of the Foundry Research Institute. 10(3), 27-37.
[3] Shroyer, H.F. (1958). Cavityless Casting Mold and Method of Making Same. U.S. Patent No. 2,830, 343.
[4] Kaczorowski, R., Just, P. & Pacyniak, T. (2013), Test bench for analyzing the lost foam process. Archives of Foundry Engineering. 13(1), 57-62.
[5] Buczkowska, K., Just, P., Świniarska, J. & Pacyniak, T. (2015). The effect of the type, the ceramic coating thickness and the pattern set density on the degree of gas porosity in casting. Archives of Foundry Engineering. 15(2), 7-12.
[6] Żmudzińska, M., Faber, J., Perszewska, K., Żółkiewicz, Z., Maniowski, Z. (2011). Studying the emission of products formed during evaporation of polystyrene patterns in the lost foam process in terms of the work environment. The Transactions of the Foundry Research Institute. 50(1), 23-33.
[7] Żółkiewicz, Z., Baliński, A., Żółkiewicz M. (2017). Characteristics of the thermal process of polystyrene model gasification. The Transactions of the Foundry Research Institute. 17(3), 201 - 210.
[8] Mocek, J. & Chojecki, A. (2014). Gas atmosphere formed in casting by full mold process. Archives of Metallurgy and Materials. 59(3), 1045-1049.
[9] Żółkiewicz, Z. & Żółkiewicz, M. (2010). Characteristic properties of materials for evaporative patterns. Archives of Foundry Engineering. 10(spec. 3), 289-292.
[10] Pielichowski, J., Sobczak, J.J., Żółkiewicz, Z., Hebda, E., Karwiński, A. (2011). The thermal analysis of polystyrene foundry model. The Transactions of the Foundry Research Institute. 11(1), 15-21.
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Authors and Affiliations

M. Jureczko
1 2
Dariusz Bartocha
ORCID: ORCID

  1. Department of Foundry Engineering, Silesian University of Technology, 7 Towarowa Str. 44-100 Gliwice, Poland
  2. Joint Doctoral School, Silesian University of Technology, 2A Akademicka Str. 44-100 Gliwice, Poland

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