A device and method for producing fine-grained aluminum alloy round ingots

Abstract

The invention belongs to the technical field of aluminum alloy casting and particularly relates to a device and a method for producing a fine grain aluminum alloy round cast ingot. The device comprises a flow channel platen, a flow channel, a landing slab, an upper coil, a lower coil, a crystallizer water tank, a flow guiding pipe, a threaded column, a graphite annulus, a crystallizer inner sleeve, a bolt and a dummy bar head. The production technology includes the following steps. Cool water is filled into the upper coil and a crystallizer. The cool water enters into the crystallizer inner sleeve through the crystallizer water tank, is ejected from water holes in the lower portion of the crystallizer inner sleeve and acts on the surface of a cast ingot. An aluminum melt flows into the crystallizer through the flow channel and a flow guiding pipe and is solidified in the crystallizer. After the graphite annulus forms a blank shell, a casting machine is started to perform casting. When the length of the cast ingot reaches 150mm, an excitation source is started. After casting is finished, the excitation source is shut down and water cool is cut off. With the device and the method for producing a fine grain aluminum alloy round cast ingot, aluminum alloy semi-continuous casting is achieved under the action of double coils inside and outside the crystallizer, surface quality of the cast ingot is improved, a solidification structure of the cast ingot is greatly refined and metallurgical quality of the cast ingot is improved.

Description

technical field

[0001] The invention belongs to the technical field of aluminum alloy casting, and in particular relates to a device and method for producing fine-grained aluminum alloy round ingots. Background technique

[0002] Aluminum is the second largest metal after iron, and it is the most typical lightweight material among metal materials, which has the advantages of high specific strength, easy processing, and low cost. It has been widely used in various fields of the national economy, such as aerospace, transportation, electronic communications, light industrial building materials, packaging containers, petrochemicals, hardware and electrical appliances, and many other fields. It can be known from the Hall-Petch formula that the yield strength of the material is inversely proportional to the grain size of the material. At the same time, grain refinement can also improve the plasticity and toughness of the material, which is an important way to improve the quality o...

Examples

Embodiment 1

[0027] The production process steps of the fine-grained aluminum alloy round ingot using the above-mentioned device are as follows:

[0028] (1) Lift the dummy head into the graphite ring before casting, feed the upper coil and the crystallizer with cooling water, the cooling water enters the inner sleeve of the mold through the crystallizer water tank, and is sprayed out from the water hole at the lower part of the inner sleeve of the crystallizer , acting on the surface of the ingot;

[0029] (2) The inner diameter of the inner sleeve of the mold is 198mm. The aluminum melt flows into the mold through the flow channel and the guide tube, and the melt solidifies in the mold for 7 seconds. After the graphite ring forms a slab shell, start the casting machine to start casting: start The casting speed of the car is 70mm / min, and then increases linearly to 100 mm / min within 2min;

[0030] (3) When the length of the ingot reaches 150mm, turn on the excitation power supply, the fr...

Embodiment 2

[0034] The production process steps of the fine-grained aluminum alloy round ingot using the above-mentioned device are as follows:

[0035](1) Lift the dummy head into the graphite ring before casting, feed the upper coil and the crystallizer with cooling water, the cooling water enters the inner sleeve of the mold through the crystallizer water tank, and is sprayed out from the water hole at the lower part of the inner sleeve of the crystallizer , acting on the surface of the ingot;

[0036] (2) The inner diameter of the inner sleeve of the mold is 50 mm. The aluminum melt flows into the mold through the flow channel and the guide tube. The melt solidifies in the mold for 5 seconds. After the graphite ring forms a billet shell, start the casting machine to start casting: start The casting speed of the car is 100mm / min, and then increases linearly to 260 mm / min within 2min;

[0037] (3) Turn on the excitation power supply when the ingot length reaches 150mm, the current freq...

Embodiment 3

[0041] The production process steps of the fine-grained aluminum alloy round ingot using the above-mentioned device are as follows:

[0042] (1) Lift the dummy head into the graphite ring before casting, feed the upper coil and the crystallizer with cooling water, the cooling water enters the inner sleeve of the mold through the crystallizer water tank, and is sprayed out from the water hole at the lower part of the inner sleeve of the crystallizer , acting on the surface of the ingot;

[0043] (2) The inner diameter of the inner sleeve of the mold is 310mm. The aluminum melt flows into the mold through the flow channel and the guide tube, and the melt solidifies in the mold for 5 seconds. After the graphite ring forms a billet shell, start the casting machine to start casting: start The turning speed is 40mm / min, and then increases linearly to 60mm / min within 2min;

[0044] (3) Turn on the excitation power supply when the length of the ingot reaches 150mm, the frequency rang...

technical field

[0001] The invention belongs to the technical field of aluminum alloy casting, and in particular relates to a device and method for producing fine-grained aluminum alloy round ingots. Background technique

[0002] Aluminum is the second largest metal after iron, and it is the most typical lightweight material among metal materials, which has the advantages of high specific strength, easy processing, and low cost. It has been widely used in various fields of the national economy, such as aerospace, transportation, electronic communications, light industrial building materials, packaging containers, petrochemicals, hardware and electrical appliances, and many other fields. It can be known from the Hall-Petch formula that the yield strength of the material is inversely proportional to the grain size of the material. At the same time, grain refinement can also improve the plasticity and toughness of the material, which is an important way to improve the quality o...

Examples

Embodiment 1

[0027] The production process steps of the fine-grained aluminum alloy round ingot using the above-mentioned device are as follows:

[0028] (1) Lift the dummy head into the graphite ring before casting, feed the upper coil and the crystallizer with cooling water, the cooling water enters the inner sleeve of the mold through the crystallizer water tank, and is sprayed out from the water hole at the lower part of the inner sleeve of the crystallizer , acting on the surface of the ingot;

[0029] (2) The inner diameter of the inner sleeve of the mold is 198mm. The aluminum melt flows into the mold through the flow channel and the guide tube, and the melt solidifies in the mold for 7 seconds. After the graphite ring forms a slab shell, start the casting machine to start casting: start The casting speed of the car is 70mm / min, and then increases linearly to 100 mm / min within 2min;

[0030] (3) When the length of the ingot reaches 150mm, turn on the excitation power supply, the fr...

Embodiment 2

[0034] The production process steps of the fine-grained aluminum alloy round ingot using the above-mentioned device are as follows:

[0035](1) Lift the dummy head into the graphite ring before casting, feed the upper coil and the crystallizer with cooling water, the cooling water enters the inner sleeve of the mold through the crystallizer water tank, and is sprayed out from the water hole at the lower part of the inner sleeve of the crystallizer , acting on the surface of the ingot;

[0036] (2) The inner diameter of the inner sleeve of the mold is 50 mm. The aluminum melt flows into the mold through the flow channel and the guide tube. The melt solidifies in the mold for 5 seconds. After the graphite ring forms a billet shell, start the casting machine to start casting: start The casting speed of the car is 100mm / min, and then increases linearly to 260 mm / min within 2min;

[0037] (3) Turn on the excitation power supply when the ingot length reaches 150mm, the current freq...

Embodiment 3

[0041] The production process steps of the fine-grained aluminum alloy round ingot using the above-mentioned device are as follows:

[0042] (1) Lift the dummy head into the graphite ring before casting, feed the upper coil and the crystallizer with cooling water, the cooling water enters the inner sleeve of the mold through the crystallizer water tank, and is sprayed out from the water hole at the lower part of the inner sleeve of the crystallizer , acting on the surface of the ingot;

[0043] (2) The inner diameter of the inner sleeve of the mold is 310mm. The aluminum melt flows into the mold through the flow channel and the guide tube, and the melt solidifies in the mold for 5 seconds. After the graphite ring forms a billet shell, start the casting machine to start casting: start The turning speed is 40mm / min, and then increases linearly to 60mm / min within 2min;

[0044] (3) Turn on the excitation power supply when the length of the ingot reaches 150mm, the frequency rang...

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