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Abstract

There are mainly two different ways of producing sand cores in the industry. The most used is the shooting moulding process. A mixture of sand and binder is injected by compressed air into a cavity (core), where it is then thermally or chemically cured. Another relatively new method of manufacturing cores is the use of 3D printing. The principle is based on the method of local curing of the sand bed. The ability to destroy sand cores after casting can be evaluated by means of tests that are carried out directly on the test core. In most cases, the core is thermally degraded and the mechanical properties before and after thermal exposure are measured. Another possible way to determine the collapsibility of core mixtures can be performed on test castings, where a specific casting is designed for different binder systems. The residual strength is measured by subsequent shake-out or knock-out tests. In this paper, attention will be paid to the collapsibility of core mixtures in aluminium castings.
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Bibliography

[1] Dietert, H.W. (1950). Core knock-out, in Foundry Core Practice, 2nd ed. Chicago: American Foundrymen’s Society.
[2] Jorstad, J.L. (2008). Expendable-mold casting processes with permanent patterns, in ASM Handbook Vol. 15 Casting, 10th ed. ASM International
[3] Almaghariz, E.S., Conner, B.P., Lenner, L., Gullapalli, R., Manogharan, G.P. (2016). Quantifying the role of part design complexity in using 3D sand printing for molds and cores. International Journal of Metalcasting. 10, 240-252. DOI: 10.1007/s40962-016-0027-5.
[4] Vykoukal, M., Burian, A., Přerovská, M., Bajer, T., Beňo, J. (2019). Gas evolution of GEOPOL® W sand mixture and comparison with organic binders. Archives of Foundry Engineering. 19(2), 49-54.
[5] Steinhäuser, T. (2017). Inorganic binders-Benefits, State of the art, Actual use. In World Cast in Africa, Innovative for Sustainability, Proceedings of the South African Metal Casting Conference, Johannesburg, South Africa, 13–17 March 2017; WFO: Johannesburg, South Africa, p. 26
[6] Ramrattan, S. (2019). Evaluating a ceramic resin-coated sand for aluminum and iron castings. International Journal of Metalcasting. 13(3), 519-527. DOI: https://doi.org/10.1007/s40962-018-0269-5
[7] Ettemeyer, F., Schweinefuß, M., Lechner, P., Stahl, J., Greß, T., Kaindl, J., Durach, L., Volk, W. & Günther, D. (2021). Characterisation of the decoring behaviour of inorganically bound cast-in sand cores for light metal casting. Journal of Materials Processing Technology. 296, 117201, ISSN 0924-0136. DOI: https://doi.org/10.1016/j.jmatprotec.2021. 117201.
[8] Dobosz, P., Jelínek, K., Major-Gabryś, K. (2011). Development tendencies of moulding and core sands. China Foundry. 8, 438-446.

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Authors and Affiliations

T. Obzina
1
V. Merta
1
ORCID: ORCID
J. Rygel
1
P. Lichý
1
ORCID: ORCID
K. Drobíková
1

  1. VSB - Technical University of Ostrava, Czech Republic

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