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Device and method for applying group frequency ultrasounds to conduct magnesium alloy semi-continuous casting

A magnesium alloy, semi-continuous technology, applied in the direction of casting equipment, casting melt containers, manufacturing tools, etc., can solve the problems of limited sound wave superposition effect, low stirring intensity, attenuation, etc., and achieve the effect of enhancing the range of cavitation and reducing heat Effect of loss and improvement of cavitation strength

Active Publication Date: 2019-09-10
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the skin effect of the applied electromagnetic field makes the area of ​​action limited and the stirring intensity is low, making it difficult to improve the structure and properties of large-scale ingots
[0005] Ultrasonic field, as a mechanical wave with short stroke, high efficiency and strong stability, has been applied in the field of non-ferrous metal smelting to improve the quality of ingots; at present, most scholars believe that the cavitation effect and acoustic flow effect produced by ultrasonic field can promote the core to achieve the purpose of refining grains; among them, Shanghai University (2004) invented a side power ultrasonic introduction method to improve the metal solidification structure; Tsinghua University (2008) invented a top introduction ultrasonic treatment device, which can refine Grain size and uniform composition; at present, most casting equipment is dominated by single-frequency ultrasound, but due to defects such as unstable resonance frequency and severe attenuation of ultrasonic waves in the melt, the range of ultrasonic cavitation is limited to the vicinity of the end surface of the radiation rod. It is only suitable for the production of small-sized ingots; due to the limited sound wave superposition effect of a single ultrasonic field, the cavitation intensity is limited, so the combined frequency ultrasonic field can increase the Acoustic coupling strength in the melt, so that high-strength, fine-grained, homogeneous magnesium alloy ingots can be obtained in semi-continuous casting

Method used

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  • Device and method for applying group frequency ultrasounds to conduct magnesium alloy semi-continuous casting
  • Device and method for applying group frequency ultrasounds to conduct magnesium alloy semi-continuous casting
  • Device and method for applying group frequency ultrasounds to conduct magnesium alloy semi-continuous casting

Examples

Experimental program
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Effect test

Embodiment 1

[0071] The structure of the device for semi-continuous casting of magnesium alloys by applying group frequency ultrasound is as follows: figure 2 Shown, comprise smelting furnace 5, tundish 17 and crystallizer 2, be provided with pipette 8 between smelting furnace 5 and tundish 17, be provided with chute 4 between tundish 17 and crystallizer 2; A protective gas annular pipe 3 is provided, and the inside of the protective gas annular pipe 3 communicates with the protective gas source through a pipeline. The protective gas annular pipe 3 is provided with an air outlet, and the air outlet faces the axis of the crystallizer;

[0072] The tundish structure is as Figure 4 As shown, a first ultrasonic generating device is fixed on the side wall, and a second ultrasonic generating device is arranged in the tundish. The first ultrasonic generating device consists of a first ultrasonic radiation rod 31, a first ultrasonic guide rod 32 and a first ultrasonic transducer The second ultr...

Embodiment 2

[0095] Apply group frequency ultrasonic to carry out the device structure of semi-continuous casting of magnesium alloy with embodiment 1, difference is:

[0096] (1) Tundish structure such as Figure 5 As shown, the first ultrasonic generating device is fixed on the bottom plate;

[0097] (2) The axes of the first ultrasonic radiation rod 31 and the second ultrasonic radiation rod 12 coincide;

[0098] (3) The ultrasonic transducer is a piezoelectric ceramic transducer with a structure such as Figure 7 Shown in (b); piezoelectric ceramic transducer comprises piezoelectric ceramic transducer casing 44, two metal diaphragms 47 and titanic acid piezoelectric ceramic material 48, and piezoelectric ceramic transducer casing 44 is provided with The transducer air inlet 43 and the transducer air outlet 49 are used to circulate the cooling gas. The upper and lower ends of the titanic acid piezoelectric ceramic material 48 are respectively connected to a metal diaphragm 47, and the...

Embodiment 3

[0110] Apply group frequency ultrasonic to carry out the device structure of semi-continuous casting of magnesium alloy with embodiment 1, difference is:

[0111] Ultrasonic transducer structure such as Figure 8 As shown in (a), two sets of terbium iron magnetostrictive materials are arranged in each transducer box;

[0112] Method is with embodiment 1, and difference is:

[0113] (1) Preparation Magnesium alloy ingot;

[0114] (2) After refining, the temperature of the magnesium alloy melt is 50°C above the liquidus line of the magnesium alloy;

[0115] (3) The tundish, pipette, first ultrasonic radiation rod and second ultrasonic radiation rod are preheated to the same temperature as the magnesium alloy melt; the vertical distance between the first ultrasonic radiation rod and the second ultrasonic radiation rod is 50mm

[0116] (4) The frequencies of ultrasonic waves emitted by the two ultrasonic radiation rods are 20 kHz and 35 kHz respectively; the bottom end of the...

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Abstract

The invention discloses a device and method for applying group frequency ultrasounds to conduct magnesium alloy semi-continuous casting. The device comprises a tundish, a first ultrasonic generation device is fixed to the side wall or a bottom plate of the tundish, a second ultrasonic generation device is arranged in the tundish, and the front end faces of ultrasonic radiation rods of the two ultrasonic generation devices are located in the tundish. The method includes the steps that firstly, magnesium alloy melt is smelted; secondly, the tundish, a liquid moving pipe and the two ultrasonic radiation rods are preheated; thirdly, the refined magnesium alloy melt is conveyed to the tundish, two ultrasonic generators are started, ultrasonic waves are transmitted through the two ultrasonic radiation rods, and group frequency ultrasonic waves are formed and are applied to the magnesium alloy melt; fourthly, a crystallizer is started; and fifthly, after the group frequency ultrasonic waves are applied, a flow control valve is opened, and the magnesium alloy melt enters the crystallizer to conduct semi-continuous casting. By means of the device and the method, nonlinear overlapping of sound waves in the melt is achieved, the limitation brought by the problems of frequency drifting, sound pressure attenuation and the like are overcome, the cavitation acting range is enlarged, and the cavitation strength is improved.

Description

technical field [0001] The invention belongs to the field of light alloy smelting, and in particular relates to a device and method for semi-continuous casting of magnesium alloys by applying group-frequency ultrasonic waves. Background technique [0002] As the lightest structural metal material, magnesium alloy is widely used in the fields of 3C, aerospace, and high-speed trains. It has the advantages of high specific strength, high specific modulus, and good shock absorption performance; Defects such as developed dendrites, severe segregation, and low ingot strength caused by latent heat lead to poor formability and limit the application range of magnesium alloys. Therefore, high-strength fine-grained homogeneous magnesium alloy ingots have become a research hotspot in the field of magnesium alloys. . [0003] The semi-continuous casting method has become the main method for the production of magnesium alloy ingots due to its high efficiency and low production cost. Howe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/114B22D41/00
CPCB22D11/114B22D41/00
Inventor 乐启炽宁少晨陈星瑞程春龙宁方坤王航
Owner NORTHEASTERN UNIV
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