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Influence of Mould Material on the Mechanical Properties of Wax Models

A. Kroma P. Brzęk

Archives of Foundry Engineering | 2021 | vo. 21 | No 3 | 48-52 | DOI: 10.24425/afe.2021.138664

Keywords FDM Investment casting wax models mechanical properties wax injection dies

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Abstract

The article presents results of research on the influence of the mould material on selected mechanical properties of wax models used for production of casting in investment casting method. The main goal was to compare the strength and hardness of samples produced in various media in order to analyse the applicability of the 3D printing technology as an alternative method of producing wax injection dies. To make the wax injection dies, it was decided to use a milled steel and 3D printed inserts made using FDM (Fused Deposition Modeling) / FFF (Fused Filament Fabrication) technology from HIPS (High Impact Polystyrene) and ABS (Acrylonitrile Butadiene Styrene). A semi-automatic vertical reciprocating injection moulding machine was used to produce the wax samples made of Freeman Flakes Wax Mixture – Super Pink. During injection moulding process, the mould temperature was measured each time before and after moulding with a pyrometer. Then, the samples were subjected to a static tensile test and a hardness test. It was shown that the mould material influences the strength properties of the wax samples, but not their final hardness.

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Bibliography

[1] Campbell, J. (2015). Complete casting handbook: metal casting processes, techniques and design. (2nd ed.). Oxford: Butterworth-Heinemann.
[2] Tamta, K. & Karunakar, D.B. (2020). Development of hybrid pattern material for investment casting process: an experimental investigation on improvement in pattern characteristics. Materials and Manufacturing Processes. 36(6), 744-751. DOI: 10.1080/10426914.2020.1854471.
[3] Bernat, L. & Popielarski, P. (2020). Identification of substitute thermophysical properties of gypsum mould. Archives of Foundry Engineering. 20(1), 5-8. DOI: 10.24425/afe.2020.131274.
[4] Guzera, J. (2010). Casting production in autoclaved gypsum moulds using investment casting method. Archives of Foundry Engineering. 10(3), 307-310. (in Polish).
[5] Sarbojeet, J. (2016). Crystallization behavior of waxes. Doctoral dissertation. Utah State University, Logan, United States of America.
[6] Unknown author, Investment casting process steps (lost wax). Retrieved January 12, 2021, from http://americancastingco.com/investment-casting-process.
[7] Ruwoldt, J., Humborstad Sørland, G., Simon, S., Oschmann, H-J. & Sjoblom, J. (2019). Inhibitor-wax interactions and PPD effect on wax crystallization: New approaches for GC/MS and NMR, and comparison with DSC, CPM, and rheometry. Journal of Petroleum Science and Engineering. 177. 53-68. DOI: 10.1016/j.petrol.2019.02.046
[8] Jung, T., Kim, J-N. & Kang, S-P. (2016). Influence of polymeric additives on paraffin waxes crystallization in model oils. Korean Journal of Chemical Engineering. 33(6), 1813-1822. DOI: https:://doi.org/10.1007/s11814-016-0052-3.
[9] Simnofske, D. & Mollenhauer, K. (2017). Effect of wax crystallization on complex modulus of modified bitumen after varied temperature conditioning rates. IOP Conference Series: Materials Science and Engineering. 236. DOI: 10.1088/1757-899X/236/1/012003.
[10] Edwards, R.T. (1957). Crystal Habit of Paraffin Wax. Industrial & Engineering Chemistry. 49(4), 750-757. DOI: https://doi.org/10.1021/ie50568a042.
[11] Dantas Neto A.A., Gomes, E.A.S. & Barros Neto, E.L., Dantas, T.N.C. & Moura C.P.A.M. (2009). Determination of wax appearance temperature (WAT) in paraffin/solvent systems by photoelectric signal and viscosimetry. Brazilian Journal of Petroleum and Gas. 3(4), 149-157. ISSN: 1982- 0593.
[12] Unknown author, Freeman super pink flake wax: technical data sheet. Retrieved January 12, 2021, from https://www.freemanwax.com/datasheets/Injection/tdssuperpink.pdf.
[13] Unknown author, M-series-specification. Retrieved January 12, 2021, from https://support.zortrax.com/m-seriesspecification/.
[14] Clarke, E.W. (1951). Crystal Types of Pure Hydrocarbons in the Paraffin Wax Range. Industrial & Engineering Chemistry. 43(11), 2526–2535. DOI: https://doi.org/10.1021/ie50503a037

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Authors and Affiliations

A. Kroma

P. Brzęk

Poznan University of Technology, Institute of Materials Technology, Division of Foundry, Piotrowo 3, 61-138 Poznań, Poland

Evaluation of Collapsibility of Selected Core Systems

T. Obzina V. Merta J. Rygel P. Lichý K. Drobíková

Archives of Foundry Engineering | 2022 | vol. 22 | No 1 | 48-52 | DOI: 10.24425/afe.2022.140216

Keywords Foundry Foundry cores De-coring Knocking-out Collapsibility

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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

V. Merta

e-mail:

ORCID:

J. Rygel

P. Lichý

e-mail:

ORCID:

K. Drobíková

VSB - Technical University of Ostrava, Czech Republic

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Influence of Mould Material on the Mechanical Properties of Wax Models

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Evaluation of Collapsibility of Selected Core Systems

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Authors and Affiliations