Підвищення ефективності системи охолодження валків широкоштабового стана гарячої прокатки (ШСГП) 1680

• Datum: 2023
• Hauptverfasser: Приходько, І.Ю., Воробей, С.О., Мацко, С.В., Панченко, В.С.
• Format: Artikel
• Sprache: Ukrainisch
• Veröffentlicht: Physico-technological Institute of Metals and Alloys 2023
• Schlagworte: температура робочих валків; параметри прокатки штаб; модернізація системи охолодження
• Online Zugang: https://www.metalsandcasting.com/index.php/mcu/article/view/171
• Назва журналу: Metal and Casting of Ukraine

The cooling system for the working rolls of the finishing group of the stands of the Hot Strip Mill 1680 was examined. It is shown that the temperature of the rolls after rolling the strips is 40–80 °C. Moreover, the maximum temperature values (65–80 °C) are observed in the first three stands of the finishing group. The sizes of the cooling zones for the rolls with water (19–38° for singlerow collectors and 58–90° for two-row ones) and their location along the circumference of the rolls of all stands of the finishing group were determined, as well as the distance from the nozzles to the surface of the rolls (200–350 mm at a nominal 200 mm). The features of the temperature distribution of the upper and lower rolls along the stands of the finishing group and along the length of the roll barrel in relation to the strip rolling modes and the conditions for supplying the cooler to the surface of the rolls are established. It was determined that an increase in the rolling force (per meter of strip width) from 5 to 15 MN/m increases the temperature of the rolls by 20–25 °C. Using mathematical modeling methods, the possibility of reducing the temperature of the rolls due to the modernization of their cooling system was evaluated, in particular: adjusting the angle of the nozzles in the collectors – by 2 °C; replacement of single-row collectors from the entrance to the crate with double-row ones without changing the water flow rate – by 4 °C; increase in water consumption in one stand by 50 m3/h – by 2-4 °C; increase in water pressure by 1 atm. – by 1-3 °С; the use of undermining the surface of the strips before entering the deformation zone with an additional volume of water – by 4 °C. For a little costly increase in the efficiency of cooling the rolls, it was proposed to replace single-row cooling manifolds from the entrance to the stands by double-row in the first three stands, preserving the total water consumption by selecting the type of nozzles. The average decrease in the temperature of the rolls was at least 4 °C. The effectiveness of modernization is confirmed by a decrease in the actual specific consumption of rolls and an increase in the average specific operating time of the roll.