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Abstract

Bentonite is clay rock, which is created by decomposition of vulcanic glass. It is formed from mixture of clay minerals of smectite group,

mainly montmorillonite, beidellite and nontronite. Its typical characteristics is, that when in contact with water, it intensively swells. First

who used this term was W.C. Knight in 1887. The rock had been named after town Fort Benton in American state Montana. For its

interesting technological properties and whiteness has wide technological use. Bentonite is selectively mined and according to its final use

separately modified, which results in high quality product with specific parameters.

In the beginning of 21st century belong bentonite moulding mixtures in foundry to always perspective. Mainly increased ratio of ductile

cast iron castings production cannot be ensured without the need of quality bentonite. Great area of scope remains to further research of

moulding materials, which return also to bentonite producers.

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Authors and Affiliations

I. Vasková
M. Hrubovčáková
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Abstract

Casting quality depends on many factors including the quality of the input materials, technology, material securing and last but not least, the mould into which the casting is casted. By pouring into a single-shot mould, based mainly on 1st generation binders, is is a very important factor. Basically, a bentonite mixture represents either a three- or four-component system, but each component of the system is a heterogeneous substance. This heterogeneity punctuates mainly a non-stationary heat field, presented throughout the whole process of the casting production. The most important component is a binder and in the case of first generation binders mostly bentonites are used - clays that contain minimum of 80% of montmorillonite
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Authors and Affiliations

I. Vasková
D. Fecko
J. Malik
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Abstract

The quality of the castings depends, among other influences, on the quality of the moulding mixture used. The silica sands used are characterized by high thermal expansion compared to other sands. The tendency to dilatation of the moulding mixture can be influenced by the choice of the granulometric composition of the basic sand and the grain size. The aim of this work is to present the influence of grain distribution of foundry silica sand BG 21 from Biala Góra (Poland) and the degree of sorting (unsorted, monofraction, polyfraction) on the degree of thermal dilatation of the sand and thus on the resulting quality of the casting and susceptibility to foundry defects. For the purpose of measuring thermal dilatation, clay wash analysis was performed, sieve analysis of the sand was carried out, and individual sand fractions were carefully sorted. The measurements confirmed a higher thermal expansion in the case of monofractional sand grading, up to 51.8 %. Therefore, a higher risk of foundry stress-strain defects, such as veining, can be assumed.
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Bibliography

[1] Czerwinski, F. (2017). Modern aspects of liquid metal engineering. Metallurgical and Materials Transactions B. 48(1), 367-393. DOI: 10.1007/s11663-016-0807-6.
[2] Brůna, M. & Galčík, M. (2021). Casting quality improvement by gating system optimization. Archives of Foundry Engineering. 21(1), 132-136. https://doi.org/10.24425/afe.2021.136089.
[3] Monroe, R. (2005). Porosity in castings. AFS Transactions. 113, 519-546.
[4] Kowalski, J.S. (2010). Thermal aspects of temperature transformation in silica sand. Archives of Foundry Engineering. 10(3), 111-114. ISSN (1897-3310).
[5] Jelínek, P. (2004). Binder systems of foundry moulding mixtures – chemistry of foundry binders. (1st ed.). Ostrava. ISBN: 80-239-2188-6. (in Czech).
[6] Svidró, J., Svidró J. T., & Diószegi, A. (2020). The role of purity level in foundry silica sand on its thermal properties. Journal of Physics: Conference Series. 1527(1), 012039, 1-8. DOI 10.1088/1742-6596/1527/1/012039.
[7] Chao, Ch. & Lu, H. (2002). Stress-induced β→ α-cristobalite phase transformation in (Na2O+Al2O3)-codoped silica. Materials Science and Engineering: A. 328(1-2), 267-276. DOI: 10.1016/S0921-5093(01)01703-8.
[8] Hrubovčáková, M., Vasková, I., Benková, M. & Conev, M. (2016). Opening material as the possibility of elimination veining in foundries. Archives of Foundry Engineering. 16(3), 157-161. DOI: 10.1515/afe-2016-0070.
[9] Beňo, J., Adamusová, K., Merta, V., Bajer, T. (2019). Influence of silica sand on surface casting quality. Archives of Foundry Engineering. 19(2), 5-8. DOI: 10.24425/afe.2019.127107.
[10] Thiel, J., Ziegler, M., Dziekonski, P., Joyce, S. (2007). Investigation into the technical limitations of silica sand due to thermal expansion. Transactions of the American Foundry Society. 115, 383-400.

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Authors and Affiliations

M. Bašistová
1
ORCID: ORCID
P. Lichý
1
ORCID: ORCID

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

This paper deals with production of safety inlay for steam locomotive valve by the Patternless Process method. For the moulds creation was used moulding mixtures of II. generation, whereas binder was used a water glass. CNC miller was used for creation of mould cavity. Core was created also by milling into block made of moulding compound. In this article will be presented also making of 3D model, setting of milling tool paths and parameters for milling.

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Authors and Affiliations

R. Pastirčák
D. Urgela
E. Krivoš

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