Studies of the Properties of Materials for Foundry Patterns Used in the Production of High-quality Precision Castings

• Autorzy: Dydak A. , Książek M.

Identyfikatory

DOI

10.24425/afe.2020.133347

• Języki publikacji: EN

Abstrakty

EN

The paper presents the properties of plastics under the trade names of PMMA and Midas, and of Formowax, Romocast 305 and Romocast 930 casting waxes. Their effect on the quality of foundry patterns used in the manufacture of ceramic moulds for precision casting is also discussed. From the selected materials for foundry patterns, samples were made for testing using the following methods: (i) 3D printing in the case of plastics, and (ii) conventional method based on tooling in the form of metal moulds (dies) in the case of casting waxes. The most important physico-mechanical properties of materials for foundry patterns were determined, i.e. linear shrinkage, softening temperature, relative elongation and coefficient of thermal linear expansion. Bending tests were carried out on samples of patterns printed and made in metal moulds, including determination of the surface roughness of patterns. After the process of melting out patterns from the cavities of ceramic moulds in an autoclave, the degree of their melting out was visually assessed (i.e. the residues from pattern removal were evaluated). The ash content after burning out of foundry patterns was also determined. The conducted tests allowed comparing the important parameters of materials used for foundry patterns and assessing the suitability of selected plastics as a material for foundry patterns used in the manufacture of high-quality precision castings.

Słowa kluczowe

EN

3D printing; rapid prototyping; plastics patterns; precision casting

PL

drukowanie 3D; szybkie prototypowanie; tworzywa sztuczne; odlewanie precyzyjne

• Wydawca: Komisja Odlewnictwa Polskiej Akademii Nauk Oddział w Katowicach
• Czasopismo: Archives of Foundry Engineering
• Rocznik: 2020
• Tom: Vol. 20, iss. 4
• Strony: 55--60
• Opis fizyczny: Bibliogr. 15 poz., tab., wykr.

Twórcy

autor

Dydak A.

• The Specodlew Enterprise of Foundry Innovation Ltd., Skawina, Poland

autor

Książek M.

• AGH University of Science and Technology, Faculty of Non-Ferrous Metals, Krakow, Poland

Bibliografia

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• [2] Bonilla, W., Masood, S.H. & Iovenitti, P. (2001). An investigation of wax patterns for accurancy improvement in investment cast parts. International Journal of Advanced Manufacturing Technology. 18(5), 348-356. DOI: 10.1007/s001700170058.
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• [6] Marszałek, G. & Majczak, R. (2012). Polyethylene wax - preparation, modification and application. Polymers. 9, 640-645. DOI: 10.14314/polimery.2012.640. (in Polish).
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• [13] ASTM E228 – 17. Standard Test Method for Linear Thermal Expansion of Solid Materials With a Push-Rod Dilatometer.
• [14] PN‐ EN ISO 178: 1998 Plastics. Determination of properties during bending (in Polish).
• [15] ISO 4287:1997/Cor.1:1998/Cor.2/2005. Geometrical Product Specifications (GPS) – Surface texture: Profile method – Terms, definitions and surface texture parameters.