Diagnostics of the temperature condition of cast iron melting in induction furnaces by the content of SiO₂ and CaO slag

Abstract

The object of the research: temperature conditions for melting cast iron in induction crucible furnaces for machine-building castings. Investigated problem: incorrect selection of temperature conditions for melting cast iron in induction crucible furnaces with acid lining or deviation from the rational temperature conditions cause the risk of chemical wear of the lining. It can be caused by the interaction of the melt and slag with the lining. If the possibilities of continuous temperature control are limited and, for this reason, the possibilities of rational control of the melting process are limited, then the problem of assessing the state of the process and the risk of lining wear arises. The main scientific results: a mathematical description of the diagnostic rule for assessing the temperature conditions for melting cast iron in induction furnaces was obtained. It is a linear discriminant function of two variables, the value of which is compared with a certain threshold. Based on this comparison, it is possible to assess the temperature conditions of the process. The area of practical use of the results of the study: the obtained results can be used in foundries of industrial enterprises equipped with induction crucible furnaces, in which castings from cast iron are made. Innovative technological product: a diagnostic rule that allows for an indirect assessment of the melting temperature regime based on the SiO₂ and CaO content in the slag. This diagnostic rule can be part of a decision support system in the process of induction melting control or integrated with the melting control system. The scope of the innovative technological product: technological processes of induction melting of cast iron at the level of an element of the system or the melting control process.