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A homogenization treatment method for large-diameter free-cutting aluminum alloy cast rods

A technology of homogenization treatment and aluminum alloy, which is applied in the field of homogenization treatment of large-diameter free-cutting aluminum alloy cast bars, can solve the problem of difficulty in meeting production needs, poor extrusion performance, and difficulty in completely eliminating element segregation and dissolving coarse second phases. Compounds and other problems, to reduce energy consumption and production costs, improve the uniformity of tissue composition, and shorten the heating and holding time.

Active Publication Date: 2021-09-24
广东领胜新材料科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The existing homogenization treatment method for large-diameter free-cutting aluminum alloy cast rods with a diameter of more than 300 mm usually adopts the method of holding a long time at a certain temperature for homogenization treatment. Although this homogenization treatment method is simple to operate, it is difficult to completely Eliminate element segregation and dissolve coarse second-phase compounds, the deformation resistance of cast rods is still high, and the extrusion performance is still poor, which is difficult to meet production needs
In addition, the existing homogenization treatment method for large-diameter free-cutting aluminum alloy cast rods still has the problem of long heating and holding time, resulting in huge energy consumption and high production costs.
Therefore, the homogenization treatment method of the existing large-diameter free-cutting aluminum alloy cast rods still needs to be improved and developed.

Method used

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  • A homogenization treatment method for large-diameter free-cutting aluminum alloy cast rods
  • A homogenization treatment method for large-diameter free-cutting aluminum alloy cast rods
  • A homogenization treatment method for large-diameter free-cutting aluminum alloy cast rods

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A cast rod of free-cutting aluminum alloy with a diameter of 300 mm, consisting of the following components by mass percentage: Mg 6.23%, Mo 2.81%, Ca 1.41%, In 1.68%, Fe 1.26%, the balance being Al and unavoidable Impurity elements, the individual content of impurity elements is ≤0.01%, and the total amount of impurity elements is ≤0.05%. The homogenization treatment method includes the following steps in turn:

[0043] S1, put the aluminum alloy cast rod into the homogenization treatment furnace;

[0044] S2. Heat the aluminum alloy cast rod to 520°C at a rate of 10°C / min, and then keep it warm for 15 minutes;

[0045] S3. Cool the aluminum alloy cast rod to 455°C at a rate of 5°C / min, and then continue to keep warm for 35 minutes;

[0046] S4. The aluminum alloy cast rod was removed from the homogenization treatment furnace, and the aluminum alloy cast rod was cooled to room temperature at a cooling rate of 15° C. / min to obtain the free-cutting aluminum alloy cast r...

Embodiment 2

[0048] A cast rod of free-cutting aluminum alloy with a diameter of 500 mm, consisting of the following components by mass percentage: Mg 6.31%, Mo 2.76%, Ca 1.44%, In 1.65%, Fe 1.27%, the balance being Al and unavoidable impurity elements, the individual content of impurity elements is ≤0.01%, and the total amount of impurity elements is ≤0.05%. The homogenization treatment method includes the following steps in turn:

[0049] S1, put the aluminum alloy cast rod into the homogenization treatment furnace;

[0050] S2. Heat the aluminum alloy cast rod to 510°C at a rate of 12°C / min, and then keep it warm for 20 minutes;

[0051] S3. Cool the aluminum alloy cast rod to 460°C at a rate of 4°C / min, and then continue to keep warm for 30 minutes;

[0052] S4. The aluminum alloy cast rod was removed from the homogenization treatment furnace, and the aluminum alloy cast rod was cooled to room temperature at a cooling rate of 10° C. / min to obtain the free-cutting aluminum alloy cast r...

Embodiment 3

[0054] A cast rod of free-cutting aluminum alloy with a diameter of 400 mm, consisting of the following components by mass percentage: Mg 6.15%, Mo 2.89%, Ca 1.38%, In 1.72%, Fe 1.25%, the balance being Al and unavoidable impurity elements, the individual content of impurity elements is ≤0.01%, and the total amount of impurity elements is ≤0.05%. The homogenization treatment method includes the following steps in turn:

[0055] S1, put the aluminum alloy cast rod into the homogenization treatment furnace;

[0056] S2. Heat the aluminum alloy cast rod to 530°C at a rate of 8°C / min, and then keep it warm for 10 min;

[0057] S3. Cool the aluminum alloy cast rod to 450°C at a rate of 6°C / min, and then continue to keep warm for 40 minutes;

[0058] S4. Move the aluminum alloy cast rod out of the homogenization treatment furnace, and cool the aluminum alloy cast rod to room temperature at a cooling rate of 12° C. / min to obtain the free-cutting aluminum alloy cast rod with a diamet...

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Abstract

The invention provides a homogenization treatment method for a large-diameter easy-cutting aluminum alloy cast rod, which belongs to the technical field of aluminum alloy homogenization treatment. The method includes the following steps in sequence: S1, putting the cast rod into a homogenization treatment furnace; S2, Heat the cast rod to 510-530°C at a heating rate of 8-12°C / min, and then keep it warm for 10-20 min; S3, cool the cast rod to 450-460°C at a rate of 4-6°C / min, and then continue Keep warm for 30‑40 min; S4. Move the cast rod out of the homogenization treatment furnace, and cool the cast rod to room temperature at a cooling rate not lower than 10°C / min. The invention optimizes the process and parameters of homogenization treatment to fully melt the coarse second-phase compound inside the cast rod, eliminate the composition segregation of the cast rod, thereby reducing the deformation resistance of the cast rod and improving the uniformity and composition of the cast rod. Extrusion performance. The invention also shortens the homogenization treatment time of cast rods, which is beneficial to reducing energy consumption, reducing production costs and improving production efficiency.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloy homogenization treatment, and in particular relates to a method for homogenization treatment of large-diameter easy-cut aluminum alloy cast rods. Background technique [0002] Free-cutting aluminum alloys usually refer to aluminum alloys whose chips are easy to break, do not stick to the knife, and do not wrap around the knife. The production efficiency of cutting processing can obtain precision aluminum alloy parts with smoother surface and higher dimensional accuracy, so it is widely used in automobiles, electronics, electrical appliances, mechanical equipment and other fields. [0003] For large-diameter free-cutting aluminum alloy cast rods with a diameter of more than 300 mm, due to the high degree of alloying of elements and the wide range of solidification and crystallization temperatures, the element segregation is severe, the size of the second phase compound is large, and the defo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/047C22C21/06
CPCC22C21/06C22F1/047
Inventor 张大鹏石常亮牛艳萍孙大翔陈文龙
Owner 广东领胜新材料科技有限公司
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