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High-speed semicontinuous casting device and method of aluminum alloy cast ingot

An aluminum alloy ingot, semi-continuous technology, applied in the field of aluminum alloy casting, can solve the problems of low alloy performance, poor surface quality, serious segregation, etc., and achieve the effects of grain refinement, mechanical performance improvement, and increased cooling.

Active Publication Date: 2017-12-15
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems of poor surface quality, serious segregation, coarse grains and low alloy properties of existing aluminum alloys under ordinary casting conditions, the present invention provides a high-speed semi-continuous casting device and method for aluminum alloy ingots. The casting method increases the lubrication of the inner surface of the ingot, greatly increases the speed of semi-continuous casting, and the new secondary cooling water barrier device effectively enhances the cooling of the ingot, eliminates surface defects, reduces macro segregation, and at the same time achieves refined grains and improves the ingot The effect of tissue performance

Method used

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  • High-speed semicontinuous casting device and method of aluminum alloy cast ingot
  • High-speed semicontinuous casting device and method of aluminum alloy cast ingot

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Effect test

Embodiment 1

[0052] The structure of the high-speed semi-continuous casting device for aluminum alloy ingots is as follows: figure 1 As shown, the local enlarged structure is as figure 2 As shown, the A-A direction structure is as follows image 3 As shown, it includes hot top 2, mold inner cover 4, crystallizer outer cover 6, cooling water chamber 7 and dummy head 21, wherein the lower part of the crystallizer inner cover 4 is provided with two cold water barriers 17, and the lower part of the crystallizer outer cover 6 There is a grease quantitative valve 8 at the inlet of the oil pipeline to control the amount of lubricating oil delivered. The 8 oil pipeline outlet channels 3 on the inner wall of the crystallizer inner sleeve 4 are evenly distributed along the circumference on the same horizontal plane. The interior of the oil pipeline outlet 3 channels is filled with porous graphite. ;

[0053] The structure of the second cold water barrier 17 is as follows: Image 6 and 7 As show...

Embodiment 2

[0072] Device structure is the same as embodiment 1, and difference is:

[0073] (1) The height difference between the temperature detection point and the top surface of the rubber ring of the secondary cooling water barrier is 40mm;

[0074] (2) θ 1 is 40°, θ 2 is 60°; the inner diameter of each secondary cooling water eye is 3mm;

[0075] (3) The inner diameter of the oil delivery pipe is 1.5mm, the outlet channel height of the oil delivery pipe is 0.8mm, the depth is 3mm, and the width is 3mm;

[0076] (4) The vertical height difference between the top surface of the ring plate of the secondary cold water barrier and the bottom surface of the mold inner sleeve is 150mm;

[0077] (5) θ 3 is 45°;

[0078] Casting method is the same as embodiment 1, and difference is:

[0079] (1) The aluminum alloy used is Al-23% Si aluminum alloy; its non-equilibrium solidus temperature (T 1 ) calculated at 574°C;

[0080] (2) Prepare raw materials according to the mass percentage of...

Embodiment 3

[0086] Device structure is the same as embodiment 1, and difference is:

[0087] (1) The height difference between the temperature detection point and the top surface of the rubber ring of the secondary cooling water barrier is 50mm;

[0088] (2) θ 1 45°, θ 2 is 75°; the inner diameter of each secondary cooling water eye is 2mm;

[0089] (3) The inner diameter of the oil delivery pipe is 2mm, the outlet channel height of the oil delivery pipe is 1mm, the depth is 4mm, and the width is 5mm;

[0090] (4) The vertical height difference between the top surface of the ring plate of the secondary cold water barrier and the bottom surface of the crystallizer inner sleeve is 200mm;

[0091] (5) θ 3 is 30°;

[0092] Casting method is the same as embodiment 1, and difference is:

[0093] (1) The aluminum alloy used is Al-18%Mg 2 Si aluminum alloy; its non-equilibrium solidus temperature (T 1 ) calculated at 584°C;

[0094](2) Prepare raw materials according to the mass percenta...

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Abstract

The invention discloses a high-speed semicontinuous casting device of an aluminum alloy cast ingot, and belongs to the technical field of aluminum alloy casting. The device comprises a hot top, a crystallizer inner sleeve, a crystallizer outer sleeve, a cooling water cavity and a dummy bar head. A secondary cooling water cut-off device is arranged below the crystallizer inner sleeve, and a grease metering valve is arranged at an inlet of each oil conveying pipe below the crystallizer outer sleeve. A method comprises the steps that aluminum alloy melt is cast for semicontinuous casting, and lubricating oil is conveyed; (2) the semicontinuous casting speed is controlled to range from 200 mm / min to 400 mm / min, secondary cooling water is sprayed to the surface of the cast ingot, and the conveying amount of the lubricating oil is increased along with the casting speed; (3) the surface temperature of the cast ingot is detected; (4) the secondary cooling water cut-off device is controlled according to the surface temperature of the cast ingot; and (5) operation of the step (4) is repeated till casting is completed. According to the device and the method, the casting speed is greatly increased, the surface quality of the cast ingot is improved, the cast ingot has no casting defect, and the microstructure is uniform.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloy casting, and in particular relates to a high-speed semi-continuous casting device and method for aluminum alloy ingots. Background technique [0002] Due to the low cooling rate and poor mold lubrication of the traditional semi-continuous casting device, the casting speed is greatly limited, which seriously affects the production efficiency of aluminum alloy ingots, and the microstructure and surface quality are not ideal. [0003] Under the existing casting process, the common crystallizer cooling method is mostly a single drainage hole, and the selection of the angle and size of the water hole is difficult to maximize the cooling efficiency of the water flow, and part of the cooling effect of the secondary cooling water is lost; under high-speed casting conditions, the melt After solidification, the frictional force with the inner sleeve of the crystallizer increases, and the use of ordin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/041B22D11/055B22D11/22
CPCB22D11/041B22D11/055B22D11/225
Inventor 张海涛王东涛郭成吴子彬吴海林秦克崔建忠
Owner NORTHEASTERN UNIV
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