Eronko S. Development of principles in calculation and design of multifunctional systems of sliding gates for complex treatment and casting of steel.

Research subject - system of sliding gates for realization the complex technology of treatment and steel casting. Research objective - developing the theory of calculations, research, grounding the constructive solutions and creating multifunctional systems of sliding gates to provide technological operations with minimum time, power and labour expenditures. Mathematical and physical modeling, planning of experiment and statistical processing of the received data, and also laboratory and industrial ex-periments with application of optical-polarizing devices and methods of tensometry in a complex with analog-digital converters and PC were used as research methods. Practi-cal value consists in developing perspective constructions of sliding gates with electromechanical and hydraulic drives, which are used for measured transfer of steel from ladles to tundishes, and also for cut-off of edge slag at re-lease of steel from furnaces. Scientific novelty consists in a substantiation of expediency of development and applica-tion of multifunctional systems of sliding gates as the uni-fied system which includes base and some special blocks. The system provides decreasing of material consumption and improves the quality of steel. The further development of the calculation theory and principles of designing of cas-sette type sliding gates were fulfilled. It is based on state-ment that the key factor is the condition of indestructibility of refractory plates, what determines trouble-free work of steel casting unit. In accordance with presented concept of the block construction of sliding gates and proposed physi-cal models of thermal and hydro- and gasdynamical proc-esses, which take place in the ladle during bottom purge of steel by inert gas and following casting of steel, the follow-ing theoretical dependences were obtained for the first time, and namely: geometrical parameters of the channel of the metallic slot-hole lance, main constructive dimensions of gasdynamical protection block of the steel against secon-dary oxidation, constructive parameters of the block for measuring for submission of modifiers in steel being cast. Those results were introduced in "Makeevsky metallurgical plant", JSC "Mariupolsky metallurgical kombinat im. Il-lijch", JSC "Energomashspezstal", RPA "Turboatom", "NKMZ". Area of deployment - research and development, educational institutions, metallurgical plants.