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Continuous casting device and method for large-dimension aluminum alloy plate blank

An aluminum alloy and large-size technology, which is applied in the field of aluminum alloy casting, can solve the problems of unstable liquid level, reduced ability to refine the structure, and limited range of ultrasonic field, and achieve the effect of improving macro segregation and refining the overall structure

Inactive Publication Date: 2013-03-13
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the increase of the cross-sectional size of the ingot, it has exceeded the action limit of a single field, such as an electromagnetic field. The Lorentz force generated in the melt is the strongest at the mold wall, then gradually decays, and is the weakest in the middle. As the frequency decreases, its penetrating ability is enhanced, but when the frequency drops below 15Hz, it is easy to produce fluctuations in the liquid level of the melt, the liquid level is not stable, and at the same time the flow in the middle of the melt is weakened, and the ability to refine the tissue is reduced; the ultrasonic field, The effective range of action is around the ultrasonic rod, that is, in the middle of the melt in the crystallizer, and it rapidly weakens outwards, and has little effect on the edge of the melt. Since there is no source of ultra-high power at present, the ultrasonic field limited range

Method used

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  • Continuous casting device and method for large-dimension aluminum alloy plate blank
  • Continuous casting device and method for large-dimension aluminum alloy plate blank
  • Continuous casting device and method for large-dimension aluminum alloy plate blank

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Combined magnetic field continuous casting of 7055 large slabs

[0037] Ingot size: 360mm (thickness) × 1000mm (width) × 4000mm length

[0038] The alloy composition of the aluminum alloy slab is calculated by mass percentage: Zn8.1%, Mg2.2%, Cu2.24%, Zr0.13%, and the rest is Al

[0039] Cast implementation:

[0040] (1) Turn on the cooling water, low-frequency power supply and ultrasonic device of the crystallizer, put the ultrasonic rod into the shunt bag, and put the equipment in the waiting state;

[0041](2) Put the shunt bag into the crystallizer, open the water supply valve of the crystallizer, and check whether the secondary cooling water is normal; start the low-frequency power supply, wind the coil for 100 turns, pass the frequency 15Hz, 100A current, and the magnetic field strength is 0.02T; turn on the ultrasonic power supply , the continuous ultrasonic frequency is 10KHz, the ultrasonic output power is 3KW, the diameter of the ultrasonic head used is 30mm...

Embodiment 2

[0053] Combination Magnetic Field Continuous Casting of 7B50 Alloy Large Slab

[0054] Ingot size: 550mm (thickness) × 1650mm (width) × 500mm length

[0055] The alloy composition of the aluminum alloy slab is calculated by mass percentage: Zn6.63%, Mg2.44%, Cu2.20%, Zr0.13%, and the rest is Al

[0056] Cast implementation:

[0057] (1) Turn on the cooling water, low-frequency power supply and ultrasonic device of the crystallizer, put the ultrasonic rod into the shunt bag, and put the equipment in the waiting state;

[0058] (2) Put the shunt bag into the crystallizer, open the water supply valve of the crystallizer, and check whether the secondary cooling water is normal; start the low-frequency power supply, wind the coil for 300 turns, pass the frequency 30Hz, 300A current, and the magnetic field strength is 0.07 T; turn on the ultrasonic power supply , the continuous ultrasonic frequency is 20KHz, the ultrasonic output power is 4 KW, the diameter of the ultrasonic head ...

Embodiment 3

[0069] Combined magnetic field continuous casting of 7075 alloy large slab

[0070] Ingot size: 550mm (thickness) × 1650mm (width) × 500mm length

[0071] The alloy composition of the aluminum alloy slab is calculated by mass percentage: Zn5.62%, Mg2.55%, Cu1.50%, Zr0.20%, and the rest is Al

[0072] Cast implementation:

[0073] (1) Turn on the cooling water, low-frequency power supply and ultrasonic device of the crystallizer, put the ultrasonic rod into the shunt bag, and put the equipment in the waiting state;

[0074] (2) Put the shunt bag into the crystallizer, open the water supply valve of the crystallizer, and check whether the secondary cooling water is normal; start the low-frequency power supply, wind the coil for 500 turns, pass the frequency 50Hz, 500A current, and the magnetic field strength is 0.1 T; turn on the ultrasonic power supply , the continuous ultrasonic frequency is 30KHz, the ultrasonic output power is 5 KW, the diameter of the ultrasonic head used...

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Abstract

The invention belongs to the technical field of aluminum alloy casing, and particularly relates to a continuous casting device and a continuous casting method for a large-dimension aluminum alloy plate blank. The device consists of an aluminum alloy plate blank electromagnetic casting device and an ultrasonic device, wherein the ultrasonic device is fixedly arranged above a crystallizing device of the aluminum alloy plate blank electromagnetic casting device through ultrasonic ascending and descending frame fastening screw bolts, the aluminum alloy liquid is cast at 710 to 740 DEG C, after 200 to 400 mm of crystallizing device is cast, an ultrasonic head ascending and descending device is started, when the length of a cast ingot outlet reaches 200 to 500mm, a pneumatic switch is switched on, when the cast ingot reaches the required length, the supply of the aluminum alloy liquid is stopped, and meanwhile, the casing machine is closed. When the device and the method provided by the invention are adopted, the integral tissue of the aluminum alloy large-dimension plate blank can be obviously refined, the macroscopic segregation of the alloy elements can be obviously improved, the surface quality of the cast ingot can be improved, and cracks are avoided.

Description

[0001] technical field [0002] The invention belongs to the technical field of aluminum alloy casting, and in particular relates to a continuous casting device and method for a large-size aluminum alloy slab. Background technique [0003] DC casting has a series of advantages such as good ingot quality and high productivity, and is the main preparation method for modern aluminum alloy processing material ingots. With the continuous improvement of engineering quality requirements for ingots, a series of new DC casting methods have been developed on the basis of DC casting, such as hot top casting, air film casting, steam slip casting, low Liquid level casting and so on, but there are not many new technologies to improve the metallurgical quality inside the ingot. [0004] In the modern processing industry, in order to improve productivity and the quality of processed materials, the size of ingots is constantly increasing. In my country, the thickness of aluminum all...

Claims

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Application Information

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IPC IPC(8): B22D11/04B22D11/11
Inventor 崔建忠张海涛王向杰朱庆丰
Owner NORTHEASTERN UNIV
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