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Grain refining method based on grain refining device for semi-continuous casting of aluminum alloy

A grain-refining, semi-continuous technology used in metallurgy to solve problems such as cracking, ingot core and edges unable to solidify at the same time, etc.

Active Publication Date: 2021-06-15
SHANGHAI JIAO TONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention aims at the problem that the core and edge of the ingot cannot be solidified at the same time in the prior art, and the internal residual stress of the ingot after solidification is easy to cause cracking, and proposes a grain refinement based on aluminum alloy semi-continuous ingot The grain refinement method of the device can significantly improve the macro-segregation and cracking of the ingot, and greatly increase the yield

Method used

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  • Grain refining method based on grain refining device for semi-continuous casting of aluminum alloy

Examples

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Effect test

Embodiment 1

[0012] Such as figure 1 As shown, the grain refining device of the aluminum alloy semi-continuous ingot involved in the present embodiment includes: a push mechanism 3 facing the top of the crystallizer 7, the bottom of the push mechanism 3 is provided with a stainless steel sleeve 4 and The output device of the ceramic sleeve 5, the cooling mandrel 9 is located inside the output device.

[0013] The exterior of the crystallizer 7 is preferably provided with a water cooling mechanism.

[0014] This embodiment adopts the above-mentioned device, the casting material used is Al-4%Cu alloy, the temperature of the molten aluminum in the crucible is controlled to 700°C, the crystallizer (the diameter of the round ingot is 300mm) is passed through cooling water, and continuous or semi-continuous casting The process begins.

[0015] When the casting process reaches a stable state, the cooling mandrel with a diameter of 30mm is submerged into the center of the molten aluminum in the ...

Embodiment 2

[0018] Same as Example 1, the casting material used in this example is 7055 alloy, the temperature of molten aluminum in the crucible is controlled to be 730°C, the crystallizer (the diameter of the round ingot is 300mm) passes cooling water, and the continuous or semi-continuous casting process starts . When the casting process reaches a steady state, the cooling mandrel with a diameter of 35 mm is submerged into the center of the molten aluminum in the crystallizer through the ceramic sleeve to a depth of 180 mm, and the composition of the cooling mandrel is consistent with that of the molten aluminum. After 5 minutes, the cooling mandrel is pushed down at a speed of 25mm / min by the pushing mechanism, and the casting process and the new liquid-solid interface are kept dynamic and stable until the casting process ends.

[0019] The macro-component segregation of the edge and center of the obtained ingot is less than 5%

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Abstract

A grain refinement method and device for aluminum alloy semi-continuous casting ingots, by pouring heated pure aluminum melt into a crystallizer in a continuous or semi-continuous casting manner and starting the casting process: when the casting process reaches a steady state , the cooling mandrel is gradually pushed into the center of the lower temperature aluminum liquid in the crystallizer, and the liquid cavity in the aluminum melt is eliminated through the melting and heat absorption of the cooling mandrel, forming an optimized liquid-solid interface shape while maintaining the casting process Dynamically stable until the end of the casting process. The invention can significantly improve the macroscopic segregation and cracking phenomena of cast ingots, and greatly increase the yield of finished products.

Description

technical field [0001] The invention relates to a technology in the field of metallurgy, in particular to a grain refinement method based on a grain refinement device for aluminum alloy semi-continuous ingot casting. . Background technique [0002] The preparation process of large aluminum alloy ingots usually adopts continuous casting or semi-continuous casting. Generally, under the condition of directional solidification, the ideal liquid-solid interface of the ingot is straight, that is, the core and the edge are solidified at the same time, which is beneficial to reduce segregation and residual stress. However, as the size of the ingot increases, the heat dissipation conditions at the core of the ingot become worse and worse, making it difficult to keep the liquid-solid interface of the aluminum alloy ingot straight during the actual production process. Usually, the liquid-solid interface of a large ingot is concave, that is, a deeper liquid pocket is formed because th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/112
CPCB22D11/112
Inventor 张佼孙宝德东青
Owner SHANGHAI JIAO TONG UNIV
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