Identification of Substitute Thermophysical Properties of Gypsum Mould

• Autorzy: Bernat Ł. , Popielarski P.

Identyfikatory

DOI

10.24425/afe.2020.131274

• Języki publikacji: EN

Abstrakty

EN

Simplifications used in simulation program codes require the use of substitute parameters in the material databases (also called apparent or substitutive). On the one hand, they formally fit into the records used in the heat flow model, porosity, properties etc. and on the other hand they should be determined in conditions most similar to the real casting-mould system. The article presents results of a research on thermophysical parameters of gypsum mould used for precision casting moulds. Experiments were carried out on a cylindrical mould made of Plasticast gypsum, in which the heat source was a cylinder filled with liquid aluminium alloy of the temperature of 655°C. Energetic validation was carried out by using the NovaFlow&Solid ver. 6.3 simulation code. As a result of validation tests, substitute thermophysical parameters of gypsum were determined. For determined parameters, best-fit of solidification time from the experiment and simulation was obtained and the curves of gypsum mass heating were satisfactorily recreate.

Słowa kluczowe

EN

gypsum mould; materials date base; simulation program; thermophysical parameters; validation

PL

forma gipsowa; baza danych materiałów; program symulacyjny; właściwości termofizyczne

• Wydawca: Komisja Odlewnictwa Polskiej Akademii Nauk Oddział w Katowicach
• Czasopismo: Archives of Foundry Engineering
• Rocznik: 2020
• Tom: Vol. 20, iss. 1
• Strony: 5--8
• Opis fizyczny: Bibliogr. 12 poz., fot., rys., tab., wykr.

Twórcy

autor

Bernat Ł.

• Poznan University of Technology, CAD/CAE of Material Technology and Foundry Laboratory, Poznan, Poland

autor

Popielarski P.

• Poznan University of Technology, CAD/CAE of Material Technology and Foundry Laboratory, Poznan, Poland

Bibliografia

• [1] Guzera, J. (2010). Making casts with investment casting method in autoclaved gypsum molds. Archive of Foundry Engineering. 10(3), 307-310. (in Polish).
• [2] Guler, K.A. & Cigdem, M. (2012). Casting Quality of Gypsum Bonded Block Investment Casting Moulds. Advanced Materials Research. 445, 349-354. DOI:10.4028/www.scientific.net/AMR.445.349.
• [3] Phetrattanarangsia, T., Puncreobutra, C., Khamkongkaeoa, A., Thongchaia, C., Sakkomolsrib, B., Kuimaleec, S., Kidkhunthodd, P., Chanlekd, N. & Lohwongwatanaa, B. (2017). The behavior of gypsum-bonded investment in the gold jewelry casting process. Thermochimica Acta. 657, 144-150. DOI: 10.1016/j.tca.2017.09.008.
• [4] Nor, S.Z.M., Ismail, R. & Isa, M.I.N. (2015). Porosity and strength properties of gypsum bonded investment using terengganu local silica for copper alloys casting. Journal of Engineering Science and Technology. 10(7), 921-931.
• [5] Bobby, S.S. & Singamneni, S. (2014). Influence of moisture in the Gypsum moulds made by 3D Printing. Procedia Engineering. 97, 1618-1625. DOI: 10.1016/j.proeng.2014. 12.312.
• [6] Pietrowski, S. & Rapiejko, C. (2011). Temperature and microstructure characteristics of silumin casting AlSi9 made with investment casting method. Archive of Foundry Engineering. 11(3), 177-186.
• [7] Taylor, J.A. (2004). The Effect of Iron in Al-Si Casting Alloys. In 35th Australian Foundry Institute National Conference, 31 Oct - 3 Nov 2004 (pp. 148-157), Adelaide – South Australia.
• [8] Maa, Z., Samuel, A.M., Samuel, F.H., Doty, H.W. & Valtierra, S. (2008). A study of tensile properties in Al–Si–Cu and Al–Si–Mg alloys: Effect of β-iron intermetallics and porosity. Materials Science and Engineering A. 490, 36-51. DOI: 10.1016/j.msea.2008.01.028.
• [9] Espinoza-Cuadra, J., Gallegos-Acevedo, P., Mancha-Molinar, H. & Pikado, A. (2010). Effect of Sr and solidification conditions on characteristics of intermetallic in Al–Si 319 industrial alloys, Materials and Design. 31(1), 343-356. DOI: 10.1016/j.matdes.2009.06.017.
• [10] Hajkowski, J., Popielarski, P. & Sika, R. (2017). Prediction of HPDC casting properties made of AlSi9Cu3 alloy. Manufacturing 2017, Springer, 2018 (pp. 621-631).
• [11] Popielarski, P. & Ignaszak, Z. (2016). Effective Modelling of Phenomena in Over-Moisture Zone Existing in Porous Sand Mould Subjected to Thermal Shock. In Delgado J., Barbosa de Lima A. (eds) Drying and Energy Technologies. Advanced Structured Materials, vol 63. Springer, Cham, DOI: doi.org/10.1007/978-3-319-19767-8_10.
• [12] PN-EN 12524 - Building materials and products, Hygrothermal properties - Tabulated calculation values. (in Polish).

Uwagi

PL

Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2020).