The casting nozzle is a refractory material used to feed molten metal into the nip. It is also called caster tips. The casting tip is a very critical tool for the production of aluminum castings and rolled parts. The quality of the splitter structure of the partition in the casting nozzle directly affects the flow field distribution of molten aluminum, and will affect the uniformity of molten aluminum crystallization, thereby affecting the grain size of the cast-rolled plate.
Continuous casting of aluminum has been carried out using continuous casting machines in commercial-scale operations for many years. This continuous casting machine includes a pair of rotating water-cooled rollers. For example, the molten aluminum is fed into the nip of the rolls before the closest line of the two rolls. By touching the rollers, heat is quickly absorbed from the molten metal and freezing occurs before the metal reaches the pipeline closest to the two rollers. A significant thermal shrinkage of the thickness of the formed aluminum plate occurred between the rollers that recrystallized the aluminum plate.
The caster tip is located in front of the roll in the rolling equipment in the aluminum alloy field, and is used to guide the aluminum alloy. The aluminum melt enters the casting nozzle from the feed port at the rear end, and then is sent out from the discharge port at the front end and enters the roll, where it is cooled by the roll and rolled into a cast billet.
The caster tips can continuously cast aluminum plates several meters wide and about one centimeter thick at a speed greater than one meter per minute for several days.
The molten metal casting nozzle for the continuous casting machine is a pair of substantially rectangular refractory members, each member has a downstream edge portion and an upstream edge portion, and each member is formed of a refractory fiber mat rigidly bonded together. The refractory fiber is compressed near the downstream edge portion to a greater density than the upstream portion of the member.
A device adjacent to the upstream portion is used to space a pair of members apart to form a metal feeding gap between the members, and to allow molten metal to enter the gap to flow toward the downstream edge portion. Among them, the thermal conductivity of the refractory fiber felt gradually increases from the upstream part to the downstream edge part.