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Abstract

Mechanization of the process of core making with the use of inorganic and organic binders is based, almost solely, on core blowing machines. Presently the core blowing machines are equipped with tools and devices that allow for application of different technologies of core making. Cold-box, hot-box and warm-air technologies require that core blowing machines shall be additionally equipped with either core-box pre-heating system or gas purging and neutralization system, or hot air purging systems. Considering the possibility of using varied, the most advantageous technologies of core making, the production of universal core blowing machines equipped with replaceable devices has been undertaken in Poland. The universal core blowing systems allow for mechanization of core making process also with the use of sand, bonded by modern, eco-friendly binder systems. The paper presents selected results-based evaluation of core blowing process showing the scope of conducted design and implementation works.
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Authors and Affiliations

A. Fedoryszyn
R. Dańko
J. Dańko
M. Asłanowicz
T. Fulko
A. Ościłowski
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Abstract

The aim of the paper is experimental verification of the influence of the composition of the ceramic mixture on the mechanical properties of cast ethyl silicate cores. Cast ceramic cores have a great potential in the production of complex castings, especially in the field of hydropower. However, the disadvantage of the cast ceramic cores is their low strength during cores removing from the core box and handling with them. The research is focused mainly on the possibilities of increasing the handling strength of the cores during removal from the core box and after their ignition. The paper investigates different ways of increasing the strength of cast ceramic cores by adjusting the composition of the ceramic mixture. Further, the research verifies the possibility of increasing the strength of ceramic cores by adding synthetic fibers to the ceramic mixture. The paper also contains the results of measuring the strength of the cores after impregnation with a solution of phosphorous binder and subsequent annealing.
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Bibliography

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[6] Wagh, A.S. (2004). Chemically BondedPhosphate Ceramics. 21st Century Materials with Diverse Applications. Oxford: Elsevier. Retrieved March 15, 2022, from https://doi.org/10.1016/B978-008044505-2/50006-5
[7] Wagh, A.S. & Jeong, S.Y. (2003). Chemically bonded phosphate ceramics: i, A dissolution model of formation. Journal of the American Ceramic Society. 83(11). 1838-1844. DOI: https://doi.org/10.1111/j.1151-2916.2003.tb03569.x
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[9] Lü, K., Liu, X., Du, Z., & Li, Y. (2016). Bending strength and fracture surface topography of natural fiber-reinforced shell for investment casting process. China Foundry, 13, 211-216. DOI: 10.1007/s41230-016-5100-4.
[10] Lü, K., Liu, X., & Duan, Z. (2018). Effect of firing temperature and time on hybrid fiber-reinforced shell for investment casting. International Journal of Metalcasting. 13(3), 666-673. DOI: 10.1007/s40962-018-0280-x.
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Authors and Affiliations

P. Bořil
1
ORCID: ORCID
V. Kaňa
1
ORCID: ORCID
M. Myška
1
ORCID: ORCID
V. Krutiš
1
ORCID: ORCID

  1. Brno University of Technology, Czech Republic

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