In order to cooperate with the cooling and speeding of casting and rolling, the cooling intensity must be increased to ensure the heat balance in production.
Due to the increase of the casting-rolling speed, the defect of sticking rolls is very easy to appear. The aluminum sticking on the part or the entire width of the casting-rolling makes the strips appear horizontal defects. This is due to the imbalance of heat in the casting and rolling process. The heat balance in the casting and rolling production is an important condition to ensure the casting and rolling production, that is, the heat entering the entire casting and rolling system must be equal to the heat exported from the casting and rolling system. When the entering heat is greater than the exporting heat, the most likely defect in the casting and rolling is sticky roller. There are three process parameters that affect the heat balance, namely, casting temperature, casting speed, and cooling intensity.
By controlling the temperature of the inlet and outlet cooling water, the inlet water temperature and the outlet water temperature are reduced respectively, so that the heat taken away by the cooling water in the roll core per unit time is increased, and the casting-rolling temperature is reduced and the speed is increased while ensuring the cast-rolled coil quality.
In order to cope with the cooling and speed increase of the casting and rolling, based on the increase of the nozzle roll gap, the flow pattern of the nozzle must be improved. By improving the distribution of the blocking block in the caster tip, the temperature uniformity and fluid pressure uniformity of the nozzle cavity must be improved. Due to the unevenness of the temperature field and pressure field distribution in the cavity of the casting nozzle, the unevenness of the structure and the appearance of the structure streak defects inside and on the surface of the cast-rolled coil. In order to coordinate the cooling and speeding of casting and rolling, the cooling intensity must be increased to ensure the heat balance in production.