[China Aluminum Industry Network] With the development of various industries in the society, the demand for aluminum alloys has gradually increased, so the smelting of aluminum alloys is particularly important.
The steps for melting aluminum alloys are as follows:
1 charge. The preheated orange A is loaded with pre-cast alloy ingots and high-quality recycled materials, followed by a mid-fol alloy, followed by alloying elements.
2 temperature control. Strictly control the melting temperature of the aluminum alloy, only the right temperature can obtain high-quality alloy liquid, avoid overheating. If the temperature is too high, the oxidation loss of various elements in the alloy will increase, causing changes in the chemical composition of the alloy. If the temperature is too low, the chemical composition of the alloy is not uniform, and the inclusions, gases, and the like in the alloy are not easily discharged, and the physical and chemical properties of the alloy are degraded, which affects the casting performance.
3 time control. Strictly control the melting time, the operation should be rapid, reduce alloy inhalation and oxidation inclusions, increase the burning of alloying elements, affect the chemical composition of the alloy.
4 refining operation. The main purpose of aluminum alloy refining is to remove gases and non-metallic inclusions and uniform alloy components in the melt. Refining is a very important process in smelting. The refining agent should be selected correctly, and 0.5%-0.7% of the mass of the added alloy should be controlled as well as the refining temperature. The refining temperature is generally controlled at 700-7200C. In the refining process, the refining agent is pressed into the refining agent in batches at about 2/3 of the molten surface in batches, and the bottom rhyme of the citrus is pressed into the refining process. The clockwise rotation is uniformly and slowly performed. The speed must be slow and the motion must be smooth. The molten metal is stirred a great deal to prevent the increase of hydrogen content and inclusion of inclusions.
5 metamorphic treatment. The purpose of metamorphism of the alloy is to refine the grains and improve the performance of the casting. Modification agent should be preheated, the control points are: 1 metamorphic temperature, generally not more than 7400C; 2 metamorphic time, generally 10min; 3 the amount of modifier added, the amount of use of two-color modifier is generally 1.0% of the alloy fluid quality - 1.2%; 4 operating methods should be in place. After the alloy is refined, it must be poured as soon as possible. The sand casting should generally be controlled within 40 minutes. The metal casting should be controlled within 2 hours. Otherwise, the refining and deterioration should be performed again. The refining agent added during refining is about 0.2% of the alloy quality. (Precautions. To prevent aluminum splashing, the smelting site should be kept dry; operators should wear anti-radiation glasses, work caps, gloves, and overalls.)
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