Mulling and its Effect on the Properties of Sand-Water-Bentonite Moulding Mixture

• Autorzy: Gawronová Martina , Kielar Š. , Lichý Petr

Identyfikatory

DOI

10.24425/afe.2022.140243

• Języki publikacji: EN

Abstrakty

EN

Today, foundries are facing increasing demands for greener and more economical production while maintaining or improving the quality of the castings produced. The importance and use of green sand mixtures using bentonite as a binder are thus coming to the fore once again. They have the advantage of both eliminating the chemicalization of production and also allowing the immediate use of the already used mixture, including the binder, after adjustment of the composition and mulling. In order to maintain the quality of the resulting castings, it is necessary to monitor the properties of the moulding mixture through a series of laboratory tests. It is also essential to look at the processing quality of these mixtures, i.e. the combination of good mulling quality and efficient mulling time, which is often neglected. It is the quality of mulling and the effective mulling time that help to develop the bonding properties of the bentonite, improve the properties of the mixture, determine the efficiency of the muller and possibly reduce the time and energy required for mulling. The aim of this work is to present the effect of mulling on the properties of sand-water-bentonite mixtures. The properties studied are mainly the compactability, strength characteristics, moisture content of the mixture and the order of addition of raw materials.

Słowa kluczowe

EN

foundries; greener production; bentonite; compressive strength; cumulative mulling; quality of the castings

PL

odlewnie; produkcja ekologiczna; bentonit; wytrzymałość na ściskanie; jakość odlewów

• Wydawca: Komisja Odlewnictwa Polskiej Akademii Nauk Oddział w Katowicach
• Czasopismo: Archives of Foundry Engineering
• Rocznik: 2022
• Tom: Vol. 22, iss. 3
• Strony: 107--112
• Opis fizyczny: Bibliogr. 10 poz., tab., wykr.

Twórcy

autor

Gawronová Martina

• VSB-Technical University of Ostrava, Faculty of Materials Science and Technology, Department of Metallurgical Technologies, Czech Republic

• https://orcid.org/0000-0002-8518-275X

autor

Kielar Š.

• SB-Technical University of Ostrava, Faculty of Materials Science and Technology, Department of Metallurgical Technologies, Czech Republic

autor

Lichý Petr

• VSB-Technical University of Ostrava, Faculty of Materials Science and Technology, Department of Metallurgical Technologies, Czech Republic

• https://orcid.org/0000-0002-6170-4728

Bibliografia

• [1] Jelínek, P. & Mikšovský, F. (1985). Contribution to the evaluation of the efficiency of uniform green moulding mixture. Slévárenství. XXXIII (7), 268-274. (in Czech).
• [2] Troy, E.C. et al. (1971). A Mulling Index Applied to Sand-water-bentonite. AFS Transactions. 79, 213-224.
• [3] Strobl, S.M. (1995). How to improve green sands through more effective mulling. Modern casting. 85(2), 40-43.
• [4] Thambiah, T.R. & Sarkar, A.D. (1973). Effect of mulling time on the properties of greensands. Foundry Trade Journal. 1973, 683-684.
• [5] Headington, F., Rothwell, M.D. & Green, R. (1998). Available clay control and mulling efficiency. AFS Transactions. 1998, 271-291.
• [6] Dietert, H.W., Graham, A.L. & Schumacher, J.S. (1971). How Mulling Time Affects Sand Properties. Foundry. 1971, 42-47.
• [7] Kyncl, M. (2008). Evaluation of mixers efficiency. Diploma thesis, VŠB-TU Ostrava, Fakulta metalurgie a materiálového inženýrství, Ostrava, Czech Republic. (in Czech).
• [8] Jelínek, P. (2004). Binder systems of foundry moulding mixtures – chemistry of foundry binders. (1st ed.). Ostrava. ISBN: 80-239-2188-6. (in Czech).
• [9] Weniger, C.E. & Volkmar, A.P. (1970) A new control tool: a graph for evaluating effectiveness of available bentonite within foundry system sand. AFS Transactions. 1970, 17-24.
• [10] Kumari, A., Murari, A.K., Prasad, U. (2020). Prediction of Green Sand Moulding Properties Using Artificial Neural Network. In U. Prasad (Eds.), Advances in Science & Technology (pp. 39-52). India: Empyreal publishing house.

Uwagi

Opracowanie rekordu ze środków MEiN, umowa nr SONP/SP/546092/2022 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2022-2023)