Design of the system tundish-submerged nuzzle-tube mold of billet CCM under conditions of linear offsets of nuzzle and mold axes

Perfection of the structure and modernization of billet CCMs elements is an important task of the modem metallurgy, solving of which provides an increase of machines productivity and continuously casted billets quality. The system tundish (T) -submerged nuzzle (SN) - tube mold (TM) and its facilities, forming the flows of metal in the tundish and the mold, are most important technological units of a billets CCM. Different designs of the equipment of the system T-SN-TM for metal supply to the tube mold with T rational installation in the TM considered, which allowed to decrease steel flows turbulence. It was shown, that the decrease of flow turbulence results in a decrease of liquid steel streams speed near the tube mold walls in the area of crystallizing ingot and provides favorable conditions for forming solidifying continuously casted billet of small section, provides the billet hard shell forming and decreases probability of emergency situations. The processes of metal flows control in the presented system also shown. General view of the system T-SN-TM of a billet CCM and its controlled parameters presented. General geometric dimensions of the mold and technological parameters of the casting process also presented. To evaluate peculiarities of the casting process in the system T-SN-TM at different values of axes offset of the SN and the mold, a mathematical simulation was accomplished. A model of internal volume of the metal, moving by a closed stream through the submerged nuzzle of the tundish into the TM upper part was built by means of a solid-state simulation package.