Foundry Feeder Tip is located in front of the rolls of rolling equipment in the aluminum alloy field and is used to guide molten aluminum alloy.<\/p>\n
The molten aluminum enters the Foundry Feeder Tip from the rear inlet, and then exits from the front outlet, enters the rolls, where it is cooled by the rolls and rolled into a cast billet.<\/p>\n
Usually, the width of the cast-rolled billet is determined by the outlet width of the nozzle. In order to improve equipment utilization and reduce operating costs, the width of plates produced by ordinary casting and rolling equipment is relatively wide, generally reaching 1450mm-1600mm.<\/p>\n
For cast-rolled slabs with a width of less than 800mm, if the traditional equipment structure and production method are used for production, the unit output will decrease.<\/p>\n
The tip of the Foundry Feeder Tip is usually made of low-density ceramic material, which can withstand the wear and thermal shock of contact with liquid aluminum, such as a ceramic fiber board that is formed into the necessary shape.<\/p>\n
Due to the low density of these materials, their thermal conductivity is very low (usually less than 0.18 W\/mK), which can provide a certain degree of thermal insulation for the molten aluminum in the casting tip.<\/p>\n
However, after a period of production, they may be corroded and worn by chemicals. This may lead to the formation of various impurities in the tip structure and eventually cause the casting movement to stop prematurely.<\/p>\n
Foundry Feeder Tip usually produces the following erosion and wear<\/strong><\/p>\n 1. Castertip blocking 2. Castertip scar 3. Fine ripples Correction method: lower the liquid level of the front tank, lower the temperature of the aluminum liquid in the front tank, increase the cast tip speed, and minimize defects.
\nWhen a blockage occurs in the cast tip cavity, the metal is restricted from flowing out of the entire width of the cast tip opening, resulting in elongated pore defects on the surface of the cast-rolled strip.
\nThe pores can be very small pores, which can be observed with the naked eye.
\nSometimes, there are cavities inside the strip, and clear oxidation streaks can be seen on the surface of the strip.
\nThe correction method is to increase the temperature of the metal. It is also possible to stop the rotation of the drum for a short time to allow the metal to solidify around the obstacle, and pull it out when restarting.
\nIn some cases, blocked cast tips require the replacement of the nozzle plate.
\nGood refining measures are an effective way to prevent blockage of the cast slab.<\/p>\n
\nMetal solidification may occur inside the mouth or at the opening of the casting.
\nThe metal solidifies in the oral cavity, which is manifested as a reduction in the width of the strip or the appearance of holes in the strip.
\nThe cause of this defect may be metal leakage from the casting head or the low temperature of the metal in the nozzle plate.
\nThe correction method is as follows:
\n\u00b7If the leakage is serious, replace the pouring nozzle plate
\n\u00b7Increase the temperature of the molten aluminum in the front box
\n\u00b7Improve casting speed<\/p>\n
\nThis defect is manifested in some horizontally visible light and dark stripes on the surface of the cast-rolled steel strip. The symptoms of this defect are:
\n\u00b7The strip has horizontal dark stripes
\n\u00b7Rough edges
\n\u00b7The main motor current value drops
\nThe reasons for this defect are:
\n\u00b7The metal level is too high. Due to the excessive metal pressure, the metal in the caster tip will vibrate, causing fine waves on the surface of the board.
\n\u00b7Low casting speed
\n\u00b7Metal temperature is too high<\/p>\n
\nIdeally, the heat distribution of the liquid metal leaving the casting tip is as uniform as possible along the length of the casting tip.<\/p>\n