In the double-roll aluminum casting and rolling process, the distribution caster tips and nozzle have a great influence on the quality of the caster rolling strip. There are defects, such as plate shape, hot zone, holes, surface cracks and subcutaneous wrinkles, etc., because the aluminum melt flow is not uniform in the width direction of the casting nozzle. A suitable distribution caster tips structure is of great significance for achieving stable, efficient, fast and continuous casting and rolling production.
The two sides of the distribution caster tips and nozzle body are provided with molten metal flow passages. Two molten metal flow channels corresponding to the molten metal flow passages are formed between the front part of the casting nozzle body and the two rollers. The two molten metal flow passages are in front of the casting nozzle body.
The casting tip and nozzle body and the surface of the roll form a liquid metal circulation channel, and the liquid metal enters the liquid metal circulation channel from the liquid metal flow channel to realize the rectification of the liquid metal, which is beneficial to the continuous and stable circulation of the liquid metal. The thickness of the molten metal during circulation is reduced by the molten metal circulation channel, and the molten metal is close to the surface of the roll when passing through the molten metal circulation channel, which facilitates rapid cooling of the molten metal.
The metal temperature distribution in the entire mouth cavity is also relatively uniform, and the difference between the temperature of the molten aluminum in the middle of the nozzle cavity and the temperature of the molten aluminum on both sides is significantly reduced. It has been observed in actual production that as long as the liquid level of the front box reaches a certain value, the time for the metal to flow out of the feed nozzle is roughly the same, and the flow of the metal should be smooth and tidy.
The distribution and supply caster nozzles are relatively uniform in metal flow and temperature distribution. When the liquid metal contacts the roll surface of the roll, the heat transferred to the roll is basically the same, so that when the roll is deformed as a whole, there is no phenomenon of large local thermal convexity, which can form a relatively large good parabolic shape ensures that the cast-rolled strip has a good plate shape.