Thermal Stresses in the Wall Connections of Cast Grate Structures

• Autorzy: Bajwoluk A. , Gutowski P.
• Języki publikacji: EN

Abstrakty

EN

The purpose of this study was to establish a relationship between the type of wall connection used in the cast grates, which are part of the equipment operating in furnaces for heat treatment and thermal-chemical treatment, and stresses generated in these grates during the process of rapid cooling. The places where the grate walls are connected to each other are usually characterized by the thickness larger than the remaining parts of walls. Temperature variations in those places are responsible for the formation of hot spots, and in the hot spots temperature changes much more slowly. The type of wall connection shapes the temperature gradient in the joint cross-section, and hence also the value of thermal stresses generated during cooling. In this study, five different designs of the grates were compared; the difference in them was the type of the designed wall connection. The following design variants were adopted in the studies: X connections with and without holes, T connections with and without technological recesses, and R (ring) connection. Numerical analysis was performed to examine how the distribution of temperature changes in the initial phases of the cooling process. The obtained results served next as a tool in studies of the stress distribution in individual structures. The analysis were carried out by FEM in Midas NFX 2014 software. Based on the results obtained, the conclusions were drawn about the impact of different types of wall connections on the formation of thermal stresses in cast grates.

Słowa kluczowe

EN

information technology; foundry industry; cast grates; thermal stresses

PL

technologia informatyczna; przemysł odlewniczy; odlew; paleta; naprężenia cieplne

• Wydawca: Komisja Odlewnictwa Polskiej Akademii Nauk Oddział w Katowicach
• Czasopismo: Archives of Foundry Engineering
• Rocznik: 2016
• Tom: Vol. 16, iss. 4
• Strony: 11--16
• Opis fizyczny: Bibliogr. 9 poz., rys., tab., wykr.

Twórcy

autor

Bajwoluk A.

• Mechanical Engineering Faculty, West Pomeranian University of Technology, Szczecin, Al. Piastów 19, 70-310 Szczecin, Polska

autor

Gutowski P.

• Mechanical Engineering Faculty, West Pomeranian University of Technology, Szczecin, Al. Piastów 19, 70-310 Szczecin, Polska

Bibliografia

• [1] Piekarski, B. (2012). Creep-resistant castings used in heat treatment furnaces. Szczecin: College Publisher Zachodniopomorskiego Uniwersytetu Technologicznego, (in Polish).
• [2] Piekarski, B. & Drotlew, A. (2008). Designing of castings working in conditions of temperature cyclic changes. Archives of Mechanical Technology and Automation. 28(3), 95-102. (in Polish).
• [3] Drotlew, A. & Piekarski, B. (2001). Creep resistant casting of grates –constructional and technological notice. Archives of Foundry. 1(1), 446-453. (in Polish).
• [4] Gutowski, P. (1989). Research the causes of cracking in pallets operating in furnaces for the carburising treatment. Doctoral dissertation, Technical University of Szczecin, Szczecin. (in Polish).
• [5] Gutowski, P. & Tuleja, J. (2006). The effort analysis of fracture propagation in stable austenitic casting alloy under rapid changes of temperature. Archives of Mechanical Technology and Automation. 25(1), 25-37 (in Polish).
• [6] Kubicki, J., Christodulu, P. (1983) The stability of chromium-nickel steel under condition of carburising treatment and thermal shock. In IX Scientific Symposium on the Occasion of Caster, part 1. 93-99. Kraków: AGH. (in Polish).
• [7] Bajwoluk, A. & Gutowski, P. (2015). The effect of pallet component geometry on temperature gradient during cooling. Archive of Foundry Engineering. 15(1), 5-8. DOI: 10.1515/afe-2015-0001.
• [8] Bajwoluk, A. & Gutowski, P. (2014). Analysis of thermal stresses in components of pallets operating in furnaces for the carburising treatment. Archive of Foundry Engineering. 14(spec.1), 175-180.
• [9] Standard EN 10295:2002. Heat resistant steel castings.

Uwagi

PL

Opracowanie ze środków MNiSW w ramach umowy 812/P-DUN/2016 na działalność upowszechniającą naukę.