In the aluminum strip double-roll casting and rolling production process, the casting nozzle is the most critical component for conveying aluminum liquid. Its structure directly affects whether the molten aluminum can flow into the cast-rolling zone uniformly and steadily, which in turn affects the quality of cast-rolled slabs and even the stable and normal production of slabs.
The casting-rolling process is characterized by injecting molten metal into the wedge-shaped area of the two cooling rolls through the casting nozzle, so that the molten metal is solidified and deformed to directly produce strips of different thicknesses. Therefore, the flow field and temperature field of the melt in the nozzle cavity not only affect the stability of the casting and rolling production, but also play a key role in the quality of the strip, such as air passages, hot strips, cold barriers.
The casting nozzle for conveying aluminum liquid flow distribution technology is realized by a shunt block fixed in the cavity. Since the fixed shunt block cannot be dynamically adjusted online, once there is a serious unreasonable flow distribution and quality problems occur, the casting and rolling production have to be interrupted and replaced with a re-distribution casting nozzle. Obviously, the flow distribution technology cannot meet the requirements of cast-rolling production, especially under the condition of rapid thin strip casting, the defects of the existing flow-distribution technology are more prominent.
The casting-rolling casting nozzle cavity flow distribution device includes a runner, a front box, a casting nozzle, a side ear, a vertical lifting mechanism, and a horizontal moving slide bar.
In order to realize online control of flow distribution to solve the problems of roll shape change, shape defect, process instability caused by the change of flow field and temperature field in the casting and rolling process, and to form a closed loop control system of flatness with flatness detector, on-line eliminate various defects caused by improper distribution.