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Abstract

Within the research, selected multilayer technological systems created as combinations of water-glass containing moulding sand with

foundry tooling, were characterised on the grounds of their electrical properties. By measuring resonance frequency and quality factor of a

waveguide resonance cavity, real component of permittivity εr′ and loss tangent tgδ were determined for multilayer foundry systems with

various qualitative and quantitative compositions. It was demonstrated that combination of a sandmix and foundry tooling with known

dielectric properties results in a system with different physico-chemical properties, whose relation to the parameters of individual

components of the system is undefined at this research stage. On the grounds of measurement results, theoretical value of microwave

heating power, dissipated in unit volume of the selected multilayer foundry system, was determined. Knowledge of theoretical heating

power and evaluation of physical, chemical and structural changes occurring in moulding sands exposed to microwaves in such a

technological system makes a ground for empirical modelling of the process of microwave heating of foundry moulds and cores.

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Authors and Affiliations

B. Gal
K. Granat
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Abstract

The foundry industry is looking for solutions that improve the quality of the finished product and solutions that reduce the negative impact of the industry on the natural environment [26]. This process leads to work on the use of new or previously unused materials for binders. Organic and inorganic foundry binders are replaced by renewable materials of plant origin to meet the requirements of both the foundry customers and the environmental and health and safety regulations. The aim of this work was to identify the applicability of renewable and organic malted barley binder in moulding sand technology. The influence of the malt binder content on dry tensile strength, dry bending strength, dry permeability, dry wear resistance and flowability were evaluated. The results show that the malted barley binder can be self-contained material binding the high-silica sand grains. Selected mechanical properties of moulding sands were found to increase with an increase in binder content. It was observed that malted barley binder creates smooth bonding bridges between high-silica sand grains.
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Bibliography

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[3] Ferreira, S. H. G. da, J. C. E., Kumar, V. & Garza-Reyes, J. A. (2020). Benchmarking of cleaner production in sand mould casting companies. Management of Environmental Quality: An International Journal. 31(5), 1407-1435. DOI: 10.1108/MEQ-12-2019-0272.
[4] Fayomi, O.S.I. (2016). Hybrid effect of selected local binders on the moulding properties of river niger silica sand for industrial application. Journal of Nanoscience with Advanced Technology. 1(4), 19-23. DOI: 10.24218/jnat.2016.19.
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[6] Grabowska, B. & others. (2018). Influence of carbon fibers addition on selected properties of microwave-cured moulding sand bonded with BioCo2 binder. Archives of Foundry Engineering. 18(3), 152-160. DOI: 10.24425/123618.
[7] Chowdhury, S.I. Rashid, H. & Mumtaz, G.R. (2016) Comparison and CFD verification of binder effects in sand mould casting of aluminum alloy. ANNALS of Faculty Engineering Hunedoara - International Journal of Engineering. 14(1), 143-146.
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[10] Fox, G.P. (2009). Chemical composition in barley grains and malt quality. Genetics and Improvement of Barley Malt Quality. (63-98). Zhang G. & C. Li, Red. Berlin, Heidelberg: Springer Berlin Heidelberg. [11] Pezarski, F., Izdebska-Szanda I., Smoluchowska, E., Świder, R. & Pysz, A. (2011). Application of moulding sands with geopolymer binder in the manufacture of castings from aluminium alloys. Prace Instytutu Odlewnictwa. 51(2), 23-34. (in Polish).
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[13] Stachowicz, M., Granat, K. & Nowak, D. (2010). Studies on the possibility of more effective use of water glass thanks to application of selected methods of hardening. Archives of Foundry Engineering. 10 (spec.2), 135-140.
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Authors and Affiliations

B. Samociuk
1
B. Gal
1
D. Nowak
1

  1. Department of Foundry Engineering, Plastics and Automation, Wroclaw University of Technology, ul. Smoluchowskiego 25, 50-372 Wrocław, Poland
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Abstract

In this work, the influence of microwave drying parameters such as irradiation time and microwave power level on the properties of synthetic moulding sands is presented. Determination of compressive strength Rc s, shear strength Rt s and permeability Ps of synthetic moulding sands with the addition of two different bentonites, after drying process with variable microwave parameters were made. The research works were carried out using the microwave oven with regulated power range of the electromagnetic field. From the results obtained, the significant influence of both drying time and microwave power level on the selected properties of moulding sands was observed. In comparison to the conventional drying method, microwave drying allows to obtain higher compressive strength of the synthetic moulding sand. The influence of application microwave irradiation on permeability was not observed. Higher strength characteristics and shorter drying time are major advantages of application of the electromagnetic irradiation for drying of the synthetic moulding sand with regard to conventional drying method.

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Authors and Affiliations

D. Nowak
B. Gal
A. Włodarska
K. Granat

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