The Process of Vacuum Formation in the Shrinkage Cavity at Castings Crystallization

• Autorzy: Khrychikov V. , Semenov O. , Meniailo H. , Aftandiliants Y. , Gnyloskurenko S.

Identyfikatory

DOI

10.24425/afe.2022.143953

• Języki publikacji: EN

Abstrakty

EN

The formation process of one of the most common casting defects, a shrinkage depression concerned to shrinkage cavity, was studied. The methodology, device and the experimental set up were developed to study the shrinkage cavity growth. The kinetics of vacuum formation in the cavity of the spherical casting of Al-Si-Mg alloy at its solidification in the sand-and-clay form was investigated. The data were analysed taking in mind the temperature variation in the centre of crystallizing casting. The causes of the shrinkage depression in castings were clarified. It was determined that atmospheric pressure leads to the retraction and curvature of metal layer on the surface of the casting with lower strength below which the shrinkage cavity is formed. To avoid such defects it was recommended to use the external or internal chills, feeders and other known technological methods. Deep shrinkage cavities inside the castings could be removed with an air flow through a thin tubular needle of austenitic steels for medical injections.

Słowa kluczowe

EN

casting crystallisation; castings defects; causes of defects; shrinkage cavity; measuring vacuum

PL

krystalizacja odlewu; wady odlewów; przyczyny wad; jama skurczowa; pomiar próżni

• Wydawca: Komisja Odlewnictwa Polskiej Akademii Nauk Oddział w Katowicach
• Czasopismo: Archives of Foundry Engineering
• Rocznik: 2022
• Tom: Vol. 22, iss. 4
• Strony: 79--84
• Opis fizyczny: Bibliogr. 14 poz., il., wykr.

Twórcy

autor

Khrychikov V.

• Ukrainian State University of Science and Technologies, Ukraine

• https://orcid.org/0000-0002-8557-098X

autor

Semenov O.

• Ukrainian State University of Science and Technologies, Ukraine

• https://orcid.org/0000-0002-2339-5856

autor

Meniailo H.

• Ukrainian State University of Science and Technologies, Ukraine

• https://orcid.org/0000-0002-6874-7202

autor

Aftandiliants Y.

• National University of Life and Environmental Sciences of Ukraine, Ukraine

• https://orcid.org/0000-0001-5864-9855

autor

Gnyloskurenko S.

• National University of Life and Environmental Sciences of Ukraine, Ukraine
• Physical and Technological Institute of Metals and Alloys, National Academy of Sciences of Ukraine, Ukraine

• https://orcid.org/0000-0003-0201-7191

Bibliografia

• [1] DSTU 9051:2020. Castings of cast iron and steel. Defects. Terms and definitions. Since 01.04.2021. Pg. 15. (in Ukrainian) http://ptima.kiev.ua/images/stories/Standart/IRONSTEEL/dstu19200-80.pdf.
• [2] Rowley, M.T. (2007). International Atlas of Casting Defects. American Foundry Society. ISBN: 978-0874330533..
• [3] GOST 19200-80. Castings of cast iron and steel. Terms and definitions of defects. (1980). (in Russian).
• [4] Atlas of foundry defects. (2004). 136 Summit avenue. Montvale, NJ 07645-1720. Institute of Foundry Casting. Technopark. Pg. 23.
• [5] Reisa, A., Xub, Z., Tolb, R.V. & Netoc, R. (2012). Modelling feeding flow related shrinkage defects in aluminum castings. Journal of Manufacturing Processes. 14(1), 1-7. DOI:10.1016/j.jmapro.2011.05.003
• [6] Voronin, Y.F., Kamaev V.A. (2005). Atlas of foundry defects. Moscow: Mechanical Engineering. Pg. 327. (in Russian). https://www.twirpx.com/file/914318/.
• [7] Chokkalingam, B. & Mohamed Nazirudeen, S.S. (2009). Analysis of casting defect through defect diagnostic study approach. Journal of Engineering Annals of the Faculty of Engineering Hunedoara. 2, 209-212. ISSN 1584-2665.
• [8] Beeley, P. (2001). Foundry Technology. 719. Oxford: Butterworth Heinemann. ISBN 0750645679. https://www.academia.edu/4161769/foundry_technology_by_peter_beeley/.
• [9] Khrychikov, V.E., Semenov, O.D., Menyaylo, O.V., Shalevskaya, I.A., & Myanovskaya, Ya.V. (2021). Elimination of weights in artistic castings with different wall thickness (Removal of shrinkage depression in art castings with different wall thickness). Casting processes (Затвердіння сплавів). 4(146). 14-21. (in Ukrainian). https://plit-periodical.com.ua/en/arhiv/removal-shrinkage-depression-art-castings-different-wall-thickness.
• [10] GOST R ISO 9626-2020. (2021). Stainless steel needle pipes for the manufacture of medical devices. Requirements and test methods. Pg. 28. (in Russian).
• [11] Dunphy, R.P., Akerlind, C.G. & Pellini, W.S. (1954). Solidification, feed characteristics of gray cast irons and nodular cast irons. Foundry. 82(6), 106-121.
• [12] Rogelberg I.L, Beilin V.M. (1983). Alloys for thermocouples (handbook). Moscow: Metallurgy. 76-77. (in Russian) https://knizhen-pazar.net/products/books/597200-splav-dlya-termopar.pdf.
• [13] Leibenzon, V.O., Pilyushenko, V.L., Kondratenko, V.M., Khrychikov, V.E., Nedopyokin, F.V., Bilousov, V.V. Dmitriev, Yu.V. (2009). Hardening of metals and metal compositions. Kyiv: Scientific thought. 447. (in Ukrainian. https://nmetau.edu.ua/file/tverdinnya_metaliv_i_metalevih_kompozitsiy._pidruchnik..pdf.
• [14] Khrychikov, V.E., Semenov, O.D., Menyaylo, O.V. (2021). Application for the patent No a202101129. Ukraine. IPC (2021.01) B22D 27/13 (2006.01), B22D 25/00. Method of removing weights in castings with thickened parts of wall. (in Ukrainian). https://base.uipv.org/searchInvStat/showclaimdetails.php?IdClaim=336807&resId=1.

Uwagi

Opracowanie rekordu ze środków MEiN, umowa nr SONP/SP/546092/2022 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2022-2023)