“METTEKh” LLC (Moscow, Russia):

Timokhin O. A., Cand. Eng., Technical Director, E-mail: mettech@yandex.ru

Dependences required for calculation of thermomechanical stresses in the rollers of continuous casting machines (ССM) are defined based on proposals that such roller can be considered as hollow cylinder subjected to durable heating. Mathematic model of temperature field of rotating roller which is subjected to heating from moving continuously cast ingot is developed, as well as an algorithm and computation program for calculation of the temperature field of a roller. Correlation between standard roller strength and service life, acceptable stresses for durable roll strength and construction parameters (such as thickness of heat transfer wall, consumption and rate of cooling water in the internal roller channel) was established. It is shown that intensity of thermal load is depended on cast ingot dimensions and temperature, speed of its transportation and is connected with the period of thermal impulses and relationship between roller diameter and diameter of internal cooling surface. Decrease of thickness of roller wall at permanent thermal load and preset impulse period leads to lowering of temperature of roller external surface and, respectively, to less number of defects, owing to decrease of temperature gradient in this wall. The original technical solutions of the existing units for cooling water supply to rotating rollers (including those developed by the author and tested industrially at “Severstal” Integrated Metallurgical Works at Cherepovets) are examined. Operating features of swinging joints and proposals for choosing their constructive parameters are analyzed.

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