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Smelting and casting method for 7-series aluminum alloy

An aluminum alloy and casting machine technology, applied in the field of metal smelting, can solve the problems of increasing the coarsening trend of ingot grain size, affecting the mechanical properties of materials, improper process selection, etc., achieving good economic benefits, fewer defects, and reducing production costs Effect

Active Publication Date: 2017-04-05
CHINA ZHONGWANG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, in the casting process of 7 series aluminum alloy, improper process selection will cause many unnecessary defects in the cast rod.
If the pouring temperature is too low, the molten metal will solidify in advance; if the pouring temperature is too high, the grain size of the ingot will be coarsened, which will affect the mechanical properties of the material; Inventing a suitable casting method to reduce the defects of ingots is very necessary for the smelting field of 7-series aluminum alloys

Method used

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  • Smelting and casting method for 7-series aluminum alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A 7 series aluminum alloy smelting and casting method includes the following steps:

[0031] 1) Ingredients: ingredients according to the following mass percentages: Si: 0.07%; Fe: 0.15%; Cu: 2.0%; Mg: 2.3%; Zn: 6.4%; Ti: 0.03%, Zr: 0.1%; impurity: single≤0.05 %, the total amount is ≤0.15%; the rest is aluminum;

[0032] 2) Melting: After inputting raw materials, control the melting temperature to 740℃;

[0033] 3) Electromagnetic stirring: During the smelting process, the raw materials are melted and the electromagnetic stirring is turned on to ensure that the raw materials in the furnace melt quickly and the temperature and composition are uniform;

[0034] 4) Refining: add sodium-free refining agent to the melt for refining, the refining temperature is 730℃, the refining time is 8min, after refining, let stand for 10min, during the refining process, the suspended solids and bubbles in the melt are quickly floated by electromagnetic stirring. Eliminate the quality problems o...

Embodiment 2

[0050] A 7 series aluminum alloy smelting and casting method includes the following steps:

[0051] 1) Ingredients: ingredients according to the following mass percentages: Si: 0.05%; Fe: 0.10%; Cu: 2.2%; Mg: 2.4%; Zn: 6.7%; Ti: 0.01%, Zr: 0.1%; impurity: single≤0.05 %, the total amount is ≤0.15%; the rest is aluminum;

[0052] 2) Melting: After inputting raw materials, control the melting temperature to 760℃;

[0053] 3) Electromagnetic stirring: During the smelting process, the raw materials are melted and the electromagnetic stirring is turned on to ensure that the raw materials in the furnace melt quickly and the temperature and composition are uniform;

[0054] 4) Refining: add sodium-free refining agent to the melt for refining, the refining temperature is 750°C, the refining time is 8min, after refining, let stand for 10min, during the refining process, the suspended solids and bubbles in the melt are quickly floated by electromagnetic stirring. Eliminate the quality problems ...

Embodiment 3

[0070] A 7 series aluminum alloy smelting and casting method includes the following steps:

[0071] 1) Ingredients: ingredients according to the following mass percentages: Si: 0.03%; Fe: 0.03%; Cu: 2.1%; Mg: 2.4%; Zn: 6.8%; Ti: 0.03%, Zr: 0.1%; impurity: single ≤0.05 %, the total amount is ≤0.15%; the rest is aluminum;

[0072] 2) Melting: After inputting raw materials, control the melting temperature to 750°C;

[0073] 3) Electromagnetic stirring: During the smelting process, the raw materials are melted and the electromagnetic stirring is turned on to ensure that the raw materials in the furnace melt quickly and the temperature and composition are uniform;

[0074] 4) Refining: add sodium-free refining agent to the melt for refining, the refining temperature is 740℃, the refining time is 7min, after refining, let it stand for 10min, during the refining process, the suspended solids and bubbles in the melt are quickly floated by electromagnetic stirring. Eliminate the quality probl...

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Abstract

The invention discloses a smelting and casting method for 7-series aluminum alloy. The method includes the steps that first, according to the mass ratio, 0-0.12% of Si, 0-0.15% of Fe, 2.0%-2.2% of Cu, 2.3%-2.5% of Mg, 6.4%-6.9% of Zn, 0-0.03% of Ti, 0-0.1% of Zr, 0-0.05% of single impurities, 0-0.15% of gross impurities and the balance aluminum are mixed; and then casting is performed through the semi-continuous casting technology after smelting, refining and drossing, standing for heat preservation, on-line degassing refining and on-line refining; and the casting temperature is controlled to be 690-710 DEG C, the casting speed is 50-75mm / min, the single water flow rate is 2.8-3.4m<3> / h, and accordingly 7-series aluminum alloy casting ingots are obtained. The number of the defects of aluminum alloy cast rods produced through the method is small, the material property and finished product rate are improved, energy consumption is lowered, production cost is reduced, and the economic benefits are good.

Description

Technical field [0001] The invention belongs to the field of metal smelting, and specifically relates to a 7 series aluminum alloy smelting and casting method. Background technique [0002] The 7 series (ie 7000 series or 7XXX series) aluminum alloy is a high-strength deformed aluminum alloy of the aluminum-zinc-magnesium-copper series that can be heat treated and strengthened. It is widely used for its advantages of low density, high specific strength, and good corrosion resistance. Used in various fields of the national economy such as aviation, marine, petrochemical, etc. [0003] However, in the casting process of 7 series aluminum alloy, improper process selection will cause many unnecessary defects in the casting rod. If the pouring temperature is too low, the molten metal will solidify in advance. If the pouring temperature is too high, it will increase the grain size of the ingot and affect the mechanical properties of the material. If the pouring speed is too slow, the mo...

Claims

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Application Information

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IPC IPC(8): C22C21/10C22C1/06C22C1/03B22D11/00
CPCB22D11/003C22C1/026C22C1/03C22C1/06C22C21/10
Inventor 秦佳明王彦俊刘兆伟刘欢邓鑫于长富
Owner CHINA ZHONGWANG
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