How to search?
advanced search

Search results

Filters

  • Journals
  • Authors
  • Keywords
  • Date
  • Type

Search results

Number of results: 2
items per page: 25 50 75
Sort by:

Evaluation of Mixing Efficiency and How it Affects the Properties of the New Green Sand Mixtures

Š. Kielar M. Bašistová P. Lichy
Archives of Foundry Engineering | 2023 | vol. 23 | No 3 | 88-93 | DOI: 10.24425/afe.2023.146666
Keywords Green sand mixture Eddy mixer mixing time Optimization of mixing Green compressive strength
Download PDF Download RIS Download Bibtex

Abstract

The current trend in the preparation of green sand mixtures emphasizes the acceleration of the mixing process while maintaining the quality of the mixture. This requirement results in the necessity of determining the optimal conditions for mixing the mixture with a given mixer. This work aims to determine the optimal mixing conditions for the newly introduced eddy mixer LM-3e from the company Multiserw-Morek in the sand laboratory at the Department of Metallurgical Technologies, Faculty of Materials and Technology, VŠB - Technical University of Ostrava. The main monitored properties of mixtures will be green compressive strength and moisture of the mixture. The measured properties of the mixture mixed on the eddy mixer will be compared with the properties of the mixture mixed on the existing LM-2e wheel mixer. The result of the experiment confirmed that the eddy mixer is suitable for the preparation of a mixture of the same quality as the wheel mixer but with a significantly reduced mixing time.
Go to article

Bibliography

[1] Pastierovičová, L., Kuchariková, L., Tillová, E., Chalupová, M. & Pastirčák, R. (2022). Quality of automotive sand casting with different wall thickness from progressive secondary alloy. Production Engineering Archives. 28(2), 172-177. https://doi.org/10.30657/pea.2022.28.20.
[2] Kamińska, J., Stachowicz, M., Puzio, S. et al. (2023). Studies of mechanical and technological parameters and evaluation of the role of lustrous carbon carriers in green moulding sands with hybrid bentonite. Archivives of Civil and Mechanical Engineering. 23, 11, 1-19. https://doi.org/10.1007/s43452-022-00550-1.
[3] Radkovský, F., Gawronová, M., Merta, V., Lichý, P., Kroupová, I., Nguyenová, I., Kielar, Š., Folta, M., Bradáč, J., Kocich, R. (2022). Effect of the composition of hybrid sands on the change in thermal expansion. Materials. 15(17), 6180, 1-15. https://doi.org/10.3390/ma15176180.
[4] Troy, E. C. et al. (1971). A mulling index applied to sand-water-bentonite. AFS Transactions. 79, 213-224.
[5] Gawronová, M., Kielar, Š. & Lichý, P. (2022). Mulling and its effect on the properties of sand-water-bentonite moulding mixture. Archives of Foundry Engineering. 22(3), 107-112. DOI: 10.24425/afe.2022.140243.
[6] Multiserw-Morek. Catalogue of moulding and core mass testing equipment. Propagation catalogue. Retrieved January 20, 2023, from http://multiserw-morek.pl/!data/attachments/odlewnictwo_pl_a4_24str.pdf. (in Polish).
[7] Silica sand Biała Góra. Sand Team. Technical sheet. Holubice. Retrieved January 20, 2023 from: https://www.sandteam.cz/wp-content/uploads/2022/09/Biala_Gora_v6.pdf (in Czech).
[8] Keramost. Activated bentonite. Product Safety data sheet. Retrieved January 20, 2023 from: https://www.keramost.cz/dokumenty/sds-bentonite-activated-en.pdf.

Go to article

Authors and Affiliations

Š. Kielar
1
M. Bašistová
1
ORCID: ORCID
P. Lichy
1
ORCID: ORCID
  1. VSB - Technical University of Ostrava Faculty of Materials Science and Technology, Czech Republic

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

M. Gawronová Š. Kielar P. Lichý
Archives of Foundry Engineering | 2022 | vol. 22 | No 3 | 107-112 | DOI: 10.24425/afe.2022.140243
Keywords Bentonite Green sand mixture Mulling time Green compressive strength Cumulative mulling
Download PDF Download RIS Download Bibtex

Abstract

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.
Go to article

Bibliography

[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.

Go to article

Authors and Affiliations

M. Gawronová
1
ORCID: ORCID
Š. Kielar
1
P. Lichý
1
ORCID: ORCID
  1. VSB-Technical University of Ostrava, Faculty of Materials Science and Technology, Department of Metallurgical Technologies, Czech Republic

This page uses 'cookies'. Learn more