Abstract
The paper presents the results of the research aimed at solving the problem of rational distribution of electric drives of withdrawal rolls along the technological line of the continuous casting machine and selecting the minimum number of withdrawal rolls in different sections of the secondary cooling zone. The research includes the construction and ranking criteria for the distribution of drive rollers along the technological line of the continuous casting machine; the development of methods and algorithms for calculating the required distribution of load moments by withdrawal rolls and distribution of electric drives of withdrawal rolls along the secondary cooling zone in three modes of operation of the electric drive of the withdrawal and straightening unit: retention of the seed in the preparatory casting mode of the continuous casting machine; pulling the seed with the head of the ingot at the initial stage of metal pouring; stretching of the ingot in the working mode of casting. Theoretical studies were carried out using analytical and numerical methods to solve algebraic equations, methods of structural modeling. It is proved that due to the significant reduction in the number of withdrawal rolls, the payback period of replacement at new machines for continuous casting of the group scheme of power supply for electric motors to individual ones decreases from 5.8-7.8 years with the traditional distribution of withdrawal rolls along the secondary cooling zone to 2.8-3 years with their rational distribution calculated by the developed methods. The results of the work were used in the design of a slab machine for continuous casting of curvilinear blanks intended for casting of wide billets up to 2.5 m. According to the proposed method, the number of electric drives of withdrawal rolls is reduced to 56.
Keywords
Continuous casting machine, electric drive, pull roller, rational distribution, distribution criteria.
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