Casting method of aluminum ingot

Abstract

The invention discloses a casting method of an aluminum ingot. The casting method includes the following steps that aluminum oxide is produced from aluminum ore through a Bayer process, a mixing furnace is preheated, the aluminum oxide is melted in a smelting furnace, molten aluminum liquid is poured into the mixing furnace, then a solvent is added for refining, stirring is conducted back and forth for 0.5 h, then standing is conducted for 5 min to 10 min, dross is fished out, nitrogen is directly led into the aluminum liquid, the aluminum liquid continuously passes through alumina balls, a furnace eye of the mixing furnace is aligned with a second casting die and a third casting die of a casting machine, the temperature of the aluminum liquid in the mixing furnace is maintained at 55 DEGC to 70 DEG C, the furnace eye and the casting machine are connected through a flow groove, and the aluminum liquid is cooled gradually. By means of the casting method, the solvent is used for adsorbing oxidized impurities in the aluminum liquid, the nitrogen is used for removing nonmetallic inclusions and dissolved hydrogen in the aluminum liquid out, the impurity removing rate is high, purity ofthe cast aluminum ingot is ensured, during casting, the temperature of the aluminum liquid in the mixing furnace is ensured, air holes and cracks of the aluminum ingot can be prevented, and the production efficiency is high.

Description

Technical field [0001] The invention relates to the technical field of aluminum ingot manufacturing, in particular to a method for casting aluminum ingots. Background technique [0002] Aluminum is a silver-white metal and ranks third in the earth's crust after oxygen and silicon. The density of aluminum is relatively small, only 34.61% of iron and 30.33% of copper, so it is also called light metal. Aluminum is a non-ferrous metal whose output and consumption are second only to steel in the world. The density of aluminum is only 2.7103g / cm3, which is about 1 / 3 of the density of steel, copper or brass. Because aluminum is light, it is often used in the manufacture of land, sea and air vehicles such as automobiles, trains, subways, ships, airplanes, rockets, and spacecraft to reduce its own weight and increase the load. [0003] The raw materials in our daily industry are called aluminum ingots. According to the national standard (GB / T 1196-2008), they should be called "aluminum i...

AI Technical Summary

Problems solved by technology

[0004] In the prior art, the casting of aluminum ingots mainly has the following disadvantages: ① Porosity: mainly because the casting temperature is too high, the aluminum liquid contains more gas, the surface of the aluminum ingot has many pores (pinholes), and the surface is dark, which occurs in severe cases. Thermal cracks: ② Slag inclusions: The main reason is that the slag is not clean, resulting in surface slag inclusions; the second is that the temperature of the molten aluminum is too low, resulting in internal slag inclusions: ③ Ripples and flashes: The main reason is that the operation is not precise, and the aluminum ingots are made Too large, or the casting machine is not running smoothly: ④ Cracks: Cold cracks are mainly caused by the low casting temperature, which causes the crystallization of aluminum ingots to be not fine and dense, forming loose and even cracks: hot cracks are caused by high casting temperatures: ⑤ Composition segregation : It is mainly caused by uneven mixing when casting alloys