Manufacturing process of high-precision die-casting aluminum alloy ingot

Abstract

The invention discloses a high-precision die-casting aluminum alloy ingot manufacturing process which comprises the following steps: (1) melting: melting pure aluminum, adding alloys, and heating until all alloys are molten; (2) exhausting is conducted, specifically, the molten aluminum alloy is continuously stirred to exhaust gas in the molten metal, and stirring is conducted in a positive spiral and negative spiral alternating frequency conversion mode; (3) refining: adding a refining additive material, removing floating layer reactants of the molten aluminum alloy after refining is completed, then heating, and adding a refiner; (4) introducing argon for secondary refining, namely introducing argon for secondary refining, and degassing; the reactant removal and degassing operations are continuously performed for at least three times; (5) standing; (6) ingot casting; and (7) annealing to obtain an aluminum alloy ingot finished product. By means of the mode, the manufacturing quality of the aluminum alloy ingot can be improved, primary additive refining and secondary argon feeding refining are adopted in the aluminum alloy ingot manufacturing process, multiple times of degassing are matched in the process, and the aluminum alloy ingot is high in overall saturation degree and high in precision quality.

Description

Technical Field

[0001] The present invention relates to the field of aluminum alloy ingots, and particularly to a manufacturing process for high-precision die-cast aluminum alloy ingots. Background Art

[0002] Aluminum alloy ingots are made from pure aluminum and recycled aluminum, and other elements such as silicon (Si), copper (Cu), magnesium (Mg), and iron (Fe) are added according to international standards or special requirements to improve the deficiencies of pure aluminum in castability, chemical properties, and physical properties. Aluminum alloy ingots are suitable for casting and can make the castings have good performance. Summary of the Invention

[0003] The main technical problem to be solved by the present invention is to provide a manufacturing process for high-precision die-cast aluminum alloy ingots, which can improve the quality of aluminum alloy ingots. In the production of aluminum alloy ingots, primary additive refining and secondary argon gas refining are adopted.

[0004] To solve the above technical problem, a technical solution adopted by the present invention is: to provide a manufacturing process for high-precision die-cast aluminum alloy ingots, including the following steps: (1) Melting: Put pure aluminum into a melting furnace, heat and stir to melt it, and then add aluminum-nickel alloy, aluminum-zinc alloy, aluminum-iron alloy, and aluminum-titanium alloy, and raise the temperature until all alloys are melted to obtain an aluminum alloy melt; (2) Exhausting: Continuously stir the above aluminum alloy melt to discharge the gas in the molten metal, and use alternating frequency conversion of positive spiral and reverse spiral for stirring; (3) Refining: Add a refining additive material to the aluminum alloy melt for refining treatment. After refining, remove the floating reactants of the aluminum alloy melt, and then raise the temperature to 800°C - 850°C and add a grain refiner; (4) Ventilation secondary refining: Pass argon gas for secondary refining and then degas; The operations of removing reactants and degassing are carried out at least three times continuously; (5) Standing: Let the refined aluminum alloy melt stand until the temperature drops to 650 - 700°C; (6) Ingot casting: Cast aluminum alloy ingots; (7) Annealing treatment: Carry out annealing treatment on the above-cast aluminum alloy ingots to obtain finished aluminum alloy ingots. (7) Annealing treatment: Carry out annealing treatment on the above-cast aluminum alloy ingots to obtain finished aluminum alloy ingots.

[0005] In a preferred embodiment of the present invention, the aluminum-nickel alloy, aluminum-zinc alloy, aluminum-iron alloy, and aluminum-titanium alloy in step (2) are added together for melting.

[0006] In a preferred embodiment of the present invention, the argon gas is introduced through multiple uniform inlets for ventilation in step (3).

[0007] In a preferred embodiment of the present invention, in step (2), the pure aluminum is placed in a melting furnace and heated to a temperature of 700°C - 750°C, and after adding aluminum-nickel alloy, aluminum-zinc alloy, aluminum-iron alloy and aluminum-titanium alloy, the temperature is raised to 750°C - 800°C.

[0008] The beneficial effects of the present invention are as follows: The present invention can improve the quality of the aluminum alloy ingot. In the production of the aluminum alloy ingot, primary additive refining and secondary argon gas refining are adopted, and multiple degassing operations are carried out during the process. During degassing, stirring is carried out by alternately changing the frequency of the positive helix and the reverse helix to fully remove gas. The overall saturation of the aluminum alloy ingot is high, and the precision and quality are high. Embodiment

[0009] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0010] Embodiment 1 A manufacturing process for high-precision die-cast aluminum alloy ingots includes the following steps: (1) Melting: Place pure aluminum in a melting furnace, heat and stir to melt it, and then add aluminum-nickel alloy, aluminum-zinc alloy, aluminum-iron alloy and aluminum-titanium alloy. The aluminum-nickel alloy, aluminum-zinc alloy, aluminum-iron alloy and aluminum-titanium alloy are added together for melting. Raise the temperature until all the alloys are melted to obtain an aluminum alloy melt. The pure aluminum is placed in the melting furnace and heated to a temperature of 700°C - 750°C, and after adding the aluminum-nickel alloy, aluminum-zinc alloy, aluminum-iron alloy and aluminum-titanium alloy, the temperature is raised to 750°C - 800°C; (2) Exhaust: Continuously stir the above aluminum alloy melt to discharge the gas in the molten metal, and stir by alternately changing the frequency of the positive helix and the reverse helix; (3) Refining: Add refining additives to the aluminum alloy melt for refining treatment. After refining, remove the floating reactants of the aluminum alloy melt, and then raise the temperature to 800°C - 850°C and add a grain refiner; (4) Secondary refining by gas injection: Inject argon for secondary refining and then degas. The argon is injected through multiple uniform gas inlets; The operations of removing reactants and degassing are carried out at least three times continuously; (5) Standing: Let the refined aluminum alloy melt stand until the temperature drops to 650 - 700°C; (6) Ingot casting: Cast aluminum alloy ingots; (7) Annealing treatment: Carry out annealing treatment on the above-cast aluminum alloy ingots to obtain finished aluminum alloy ingots. The process of the present invention can improve the quality of the aluminum alloy ingot. In the production of the aluminum alloy ingot, primary additive refining and secondary argon gas refining are adopted, and multiple degassing operations are carried out during the process. During degassing, stirring is carried out by alternately changing the frequency of the positive helix and the reverse helix to fully remove gas. The overall saturation of the aluminum alloy ingot is high, and the precision and quality are high.

[0011] The above are only embodiments of the present invention, and thus do not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the content of the specification of the present invention, or directly or indirectly applied in other related technical fields, shall similarly be included within the patent protection scope of the present invention.

Claims

1. A manufacturing process for high-precision die-cast aluminum alloy ingots, characterized in that, It includes the following steps: (1) Melting: Put pure aluminum into a melting furnace, heat it, and stir to melt it. Then add aluminum-nickel alloy, aluminum-zinc alloy, aluminum-iron alloy, and aluminum-titanium alloy, and raise the temperature until all alloys melt to obtain an aluminum alloy melt; (2) Exhausting: Continuously stir the above aluminum alloy melt to discharge the gas in the molten metal, and use positive and reverse spiral alternating frequency conversion for stirring; (3) Refining: Add refining additive materials to the aluminum alloy melt for refining treatment. After refining, remove the floating layer reactants of the aluminum alloy melt, and then raise the temperature to 800°C - 850°C and add a grain refiner; (4) Venting secondary refining: Pass argon for secondary refining and then degas; The operations of removing reactants and degassing are carried out at least three times continuously; (5) Standing: Let the refined aluminum alloy melt stand until the temperature drops to 650 - 700°C; (6) Ingot casting: Cast aluminum alloy ingots; (7) Annealing treatment: Carry out annealing treatment on the above-cast aluminum alloy ingots to obtain finished aluminum alloy ingots. (8) In step (2), the aluminum-nickel alloy, aluminum-zinc alloy, aluminum-iron alloy, and aluminum-titanium alloy are added together for melting.

2. The manufacturing process of the high-precision die-cast aluminum alloy ingot according to claim 1, characterized in that, (9) In step (3), the argon is introduced through a variety of uniform inlets for ventilation.

3. The manufacturing process of the high-precision die-cast aluminum alloy ingot according to claim 1, characterized in that, (10) In step (2), the temperature for heating the pure aluminum in the melting furnace is 700°C - 750°C, and after adding the aluminum-nickel alloy, aluminum-zinc alloy, aluminum-iron alloy, and aluminum-titanium alloy, the temperature is raised to 750°C - 800°C.

4. The manufacturing process of the high-precision die-cast aluminum alloy ingot according to claim 1, characterized in that, ​