ISSN (print) 1995-2732
ISSN (online) 2412-9003

 

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DOI: 10.18503/1995-2732-2020-18-3-25-33

Abstract

Relevance and objective of the study: The paper is a review of the existing solutions to one of the urgent problems of foundry, namely the problem of a difficult knocking-out ability of casting cores from castings. Findings: The paper outlines that to the greatest extent the problem of the knocking-out ability is typical for liquid glass core mixtures. A wide range of used organic and inorganic additives is presented. Their main advantages and disadvantages are shown. To a lesser extent, the problem of the core knocking-out ability exists for other types of core mixtures, for example, for phosphate mixtures and mixtures for a cold-box-amin process. The authors made an attempt to determine the main directions taken to solve the problem of the difficult knocking-out ability of cores depending on the mechanism (physical nature) of softening. As a result, the paper proposes five main directions for solving the problem of a core knocking-out ability. Conclusions: The authors of the paper identified two most promising directions in the search for universal softening additives. The first of them is the use of pore-forming substances in the core mixtures. The second direction involves the use of thermal expansion additives. These additives can be used for several types of core mixtures. At the same time, the operating characteristics of the core will remain at a high level. The paper also presents a list of basic requirements for universal softening additives.

Keywords

Core mixture, casting core, liquid glass mixture, difficult knocking-out ability, softening additives.

For citation

Leushin I.O., Koshelev O.S., Maslov K.A., Titov A.V. Assessment of the Use of Softening Additives in the Practice of Manufacturing Casting Cores. Vestnik Magnitogorskogo Gosudarstvennogo Tekhnicheskogo Universiteta im. G.I. Nosova [Vestnik of Nosov Magnitogorsk State Technical University]. 2020, vol. 18, no. 3, pp. 25–33. https://doi.org/10.18503/1995-2732-2020-18-3-25-33

Igor O. Leushin – DrSc (Eng.), Professor, Head of the Department of Metallurgical Technologies and Equipment, Alekseev Nizhny Novgorod State Technical University, Nizhny Novgorod, Russia. Email: This email address is being protected from spambots. You need JavaScript enabled to view it.

Oleg S. Koshelev – DrSc (Eng.), Professor, Department of Mechanical Engineering Technological Complexes, Alekseev Nizhny Novgorod State Technical University, Nizhny Novgorod, Russia. Email: This email address is being protected from spambots. You need JavaScript enabled to view it.

Konstantin A. Maslov – PhD (Eng.), Associate Professor, Department of Metallurgical Technologies and Equipment, Alekseev Nizhny Novgorod State Technical University, Nizhny Novgorod, Russia. Email: This email address is being protected from spambots. You need JavaScript enabled to view it.

Andrey V. Titov– Senior Lecturer, Department of Metallurgical Technologies and Equipment, Alekseev Nizhny Novgorod State Technical University, Nizhny Novgorod, Russia. Email: This email address is being protected from spambots. You need JavaScript enabled to view it.

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