Preparing technology of 7050 aluminum alloy cast ingot

An aluminum alloy ingot and preparation process technology, applied in the field of aluminum alloy, can solve the problems of cracking of the ingot, increasing the casting process, and inability to completely remove impurities in the melt, etc.

Inactive Publication Date: 2016-03-16
SOUTHWEST ALUMINUM GRP
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0010] The above-mentioned traditional process has the following disadvantages: (1) manual refining is used, and continuous refining is not possible. After refining, the slag gas content of the melt will gradually increase, which affects the quality of the melt and directly affects the pass rate of flaw detection; (2) the online use of Al -5Ti-1B wire refiner, since the 7050 alloy contains Zr element, it w

Method used

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  • Preparing technology of 7050 aluminum alloy cast ingot
  • Preparing technology of 7050 aluminum alloy cast ingot

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preparation example Construction

[0040] This application adjusts the preparation process of 7050 aluminum alloy ingots, so that the aluminum alloy ingots can significantly reduce metallurgical defects such as looseness and coarse compounds in the ingots, and the product quality can meet aerospace requirements, while the yield rate and flaw detection pass rate are greatly improved , the production cost is significantly reduced.

[0041] In the process of preparing the aluminum alloy ingot, the applicant first batches ingredients according to the ingredients in the 7050 aluminum alloy, and then melts the ingredients after batching, and the melting temperature is ≤800°C.

[0042] The applicant then puts the melted molten aluminum to a standstill, and the standstill process is specifically: introducing the molten aluminum into a resting furnace, and adopting the air-permeable bricks in the furnace for continuous refining, and the refining process is: the refining temperature is preferably 720 ~760°C, the refining...

Embodiment 1

[0050] Ingredients: The following raw materials are mixed according to weight percentage: Si=0.06wt%, Fe=0.11wt%, Cu=2.1wt%, Mn=0.01wt%, Mg=2.4wt%, Cr=0.01wt%, Zn=6.5wt% %, Ti=0.03wt%, Zr=0.12wt%, the rest Al99.95 aluminum ingot;

[0051] Melting: Put the above raw materials into a melting furnace and melt them at a melting temperature of 700°C to obtain liquid aluminum;

[0052] Static continuous refining process: the obtained molten aluminum is introduced into a static furnace, and continuously refined by using ventilated bricks in the furnace. The refining temperature is 740°C, the gas pressure is 0.55Mpa, and the gas flow rate is 450L / h×4;

[0053] On-line refinement process: add 6kg / t Al-3Ti-0.2C wire to the refined aluminum liquid, and the adding temperature is 745℃;

[0054] Filtration process: double-stage filtration is performed on the on-line refined aluminum liquid at the first stage of 40ppi and the second stage of 60ppi;

[0055] Casting process: cast the filter...

Embodiment 2

[0061] Ingredients: The following raw materials are mixed according to weight percentage: Si=0.10wt%, Fe=0.12wt%, Cu=2.0wt%, Mn=0.05wt%, Mg=1.9wt%, Cr=0.04wt%, Zn=5.7wt% %, Ti=0.05wt%, Zr=0.09wt%, the rest Al99.95 aluminum ingot;

[0062] Melting: Put the above raw materials into a melting furnace and melt them at a melting temperature of 750°C to obtain liquid aluminum;

[0063] Static continuous refining process: the obtained molten aluminum is introduced into a static furnace, and continuously refined by using breathable bricks in the furnace. The refining temperature is 720°C, the gas pressure is 0.40Mpa, and the gas flow rate is 400L / h×4;

[0064] On-line refinement process: add 5kg / t Al-3Ti-0.2C wire to the refined aluminum liquid, and the adding temperature is 745℃;

[0065] Filtration process: double-stage filtration of the on-line refined aluminum liquid in the first stage of 30ppi and the second stage of 50ppi;

[0066] Casting process: cast the filtered aluminum l...

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Abstract

The application provides a preparing technology of an aluminum alloy cast ingot. The preparing technology comprises the following steps: after mixing materials according to the components of the 7050 aluminum alloy cast ingot, melting the materials, and guiding molten aluminum obtained into a holding furnace to carry out continuous refining; then, adding the molten aluminum obtained into Al-3Ti-0.2C wires to carry out online thinning; then, carrying out online degassing on the molten aluminum obtained by SNIF degassing equipment; then, carrying out two-stage filtering on the molten aluminum obtained; and finally, casting the molten aluminum obtained, and controlling the height of the molten aluminum in a crystallizer in the casting process so as to control a bottoming technology. The application improves the metallurgical quality of a 7050 alloy slab ingot and reduces the production cost of 7050 alloy through improving the casting tool of the 7050 aluminum alloy cast ingot and optimizing a casting technology.

Description

technical field [0001] The invention relates to the technical field of aluminum alloys, in particular to a preparation process of a 7050 aluminum alloy ingot. Background technique [0002] 7075 aluminum alloy is a cold-treated forging alloy with compact structure and strong corrosion resistance, which is the best for aviation and marine plates. With the rapid development of the aerospace industry, the demand for 7050 alloys is increasing. However, 7050 high-strength and high-toughness aluminum alloys have problems such as difficult casting and poor internal metallurgy. Products produced by traditional processes cannot meet technical requirements. The specific process of the traditional production process is: [0003] (1) Ingredients: In terms of mass percentage, Si≤0.12%, Fe≤0.15%, Cu 2.0%~2.6%, Mn≤0.10%, Mg 1.9%~2.6%, Cr≤0.04%, Zn 5.7% %~6.7%, Ti≤0.06%, Zr is 0.09%~0.14%, and the rest of Al is compounded; [0004] (2) Melting: Put Cu, Mg, Zn, Zr, Al99.95 aluminum ingots ...

Claims

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Application Information

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IPC IPC(8): C22C21/10C22C1/02C22C1/06B22D11/18
CPCC22C21/10B22D11/18C22C1/026C22C1/06
Inventor 张芯华
Owner SOUTHWEST ALUMINUM GRP
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