The current aluminum ingot casting process generally adopts the casting process, which is to pour the aluminum liquid directly into the mold and take it out after cooling. The quality of the product is mainly in this step, and the entire casting process is also based on this process. The casting process is a physical process in which liquid aluminum is cooled and crystallized into a solid aluminum ingot.
1. Continuous casting
Continuous casting can be divided into mixed furnace casting and external casting, both of which use continuous casting machines. Mixing furnace casting is the process of casting molten aluminum into the mixing furnace, which is mainly used to produce aluminum ingots for remelting and casting alloys. External casting is directly cast to the casting machine from the ladle, which is mainly used when the casting equipment cannot meet the production requirements, or the quality of the incoming materials is too poor to be directly into the furnace. Since there is no external heating source, the ladle is required to have a certain temperature, generally 690~740℃ in summer and 700~760℃ in winter to ensure that the aluminum ingot has a better appearance.
2. Vertical semi-continuous casting
Vertical semi-continuous casting is mainly used in the production of aluminum wire ingots, slab ingots and various deformed alloys for processing profiles. The molten aluminum is poured into the mixing furnace after batching. Due to the special requirements of the wires, the intermediate plate Al-B must be added to remove the titanium and vanadium (wire ingots) from the molten aluminum before casting; the ingots must be added with Al-Ti--B alloy for refinement treatment. Make the surface structure fine. Add 2# refining agent for high-magnesium alloy, the amount is 5%, stir evenly, after standing for 30 minutes, remove the scum, then cast. Lift the chassis of the casting machine before casting, and blow off the moisture on the chassis with compressed air. Then raise the base plate into the crystallizer, apply a layer of lubricating oil to the inner wall of the crystallizer, put some cooling water into the water jacket, put the dry and preheated distribution plate, automatic regulating plug and launder in place, so that each port of the distribution plate is located in the center of the crystallizer.
At the beginning of casting, press the automatic adjustment plug with your hand to block the nozzle, cut the furnace eye of the mixing furnace, and let the aluminum liquid flow into the distribution plate through the launder. When the aluminum liquid reaches 2/5 in the distribution plate, release the automatic Adjust the plug so that the molten aluminum flows into the crystallizer, and the molten aluminum is cooled on the chassis. When the aluminum liquid reaches 30mm high in the crystallizer, the chassis can be lowered and cooling water is started. The automatic adjusting plug controls the balanced flow of the aluminum liquid into the crystallizer and keeps the height of the aluminum liquid in the crystallizer unchanged. The scum and oxide film on the surface of the molten aluminum should be removed in time. When the length of the aluminum ingot is about 6m, block the furnace eye, remove the distribution plate, stop the water supply after the aluminum liquid is completely solidified, remove the water jacket, take out the cast aluminum ingot with a monorail crane, saw to the required size on the sawing machine, and then prepare for the next casting.