Modernization of a rolling table before gas cutting machine of bloom CCM

Abstract

The results of the analysis of the design of the intermediate rolling table in front of the gas cutting machine of the four-strand continuous casting machine (CCM-1) of the electric steelmaking shop of JSC Ural Steel are presented. It is shown that as a result of exposure to high temperatures (due to the unsuccessful location of the gear motor near the high temperature zone), the operability of the gear coupling of the gear motor is often disrupted. To improve the performance of the intermediate rolling table CCM-1, it is proposed to modernise it by installing a pull-down device on each strand directly in front of the gas cutting machine, the working element of which is a drive roller located above the rolling table. Rotation of the roller is carried out from an individual electric drive, and its pressing to the workpiece – by means of a hydraulic drive through a system of levers. This makes it possible to perform all 28 rollers of the rolling table non-drive ones, without changing their location. As a result of the modernization of the intermediate rolling table CML-1 in front of the gas cutting machine, it was possible to simplify its design and reduce the complexity of maintenance and repair by 64 hours per year. Replacing 28 drive rollers with non-drive rollers increases the reliability of their operation, allows you to increase the repair period of operation and thereby reduce the cost of operating costs. In addition, reducing the number of electric motors from 28 to 4 provides significant energy savings. Calculations show that the implementation of design solutions leads to a reduction in the cost of one ton of steel by 0.05 %, an increase in product profitability by 0.19 % and an increase in labor productivity by 0.41 %. Additional capital expenditures of about 1 million rubles are recouped in less than 3 months.