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Electromagnetic semicontinuous casting device and casting method thereof

A semi-continuous, electromagnetic technology, applied in the field of metal material preparation, can solve the problems of difficult industrial application, bulky, unfavorable crystallizer layout, etc.

Active Publication Date: 2017-07-14
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above technologies realize the application of electromagnetic field by applying current in a single load coil, but due to the skin effect of electromagnetic in the metal melt to be treated, in order to achieve the technical effect, it is necessary to apply a large current in the load coil, even so , it is often difficult to achieve the desired technical effect when a large volume of melt is solidified
[0005] Zhang Qin and Guo Shijie's research shows that by installing two excitation coils with alternating current and direct current in the semi-continuous casting mold to generate a stable magnetic field and an alternating magnetic field, combined with an electromagnetic guide core, the 7075 aluminum alloy or AZ80 The forced oscillation of the magnesium alloy melt can significantly refine its solidification structure and suppress segregation and cracks. However, due to the use of two sets of coils, one is bulky and is not conducive to the layout of the crystallizer, and the other is two sets of coils. The physical distance of the coil also reduces its coupling effect. At the same time, because the iron core placed inside the coil also significantly increases the complexity of the semi-continuous casting liquid injection process, it only stays in the laboratory research stage and is difficult to realize industrialization. application

Method used

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  • Electromagnetic semicontinuous casting device and casting method thereof
  • Electromagnetic semicontinuous casting device and casting method thereof
  • Electromagnetic semicontinuous casting device and casting method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0109] Such as figure 1 As shown, add magnesium ingots and aluminum ingots to the crucible melting furnace according to the requirements of AZ31B components, set the melting temperature to 700°C, add zinc ingots after complete melting, raise the temperature to 720°C, and add MnCl 2 , stirring and refining with RJ2 flux and argon gas at 730°C, the refining time is 20 minutes, and the bottom slag is removed and left to stand for 15 minutes; the liquid is transferred to the crucible resting furnace by pressurized method, and the second refining process is carried out at 740°C , the refining time is 10 minutes, and then the temperature is lowered to 640°C for 40 minutes, and then the temperature is raised to 700°C for 25 minutes; 2 +1% SF 6 Under the mixed gas, the melt is introduced into the diversion device through the flow control mechanism, and then enters the 330mm electromagnetic crystallizer system. The casting speed is controlled at 60mm / min, the water volume is 300L / min,...

Embodiment 2

[0113] Method is with embodiment 1, and difference is:

[0114] (1) Carry out the second refining treatment at 720° C., and the refining time is 15 minutes; carry out the third refining treatment at 730° C., and the refining time is 10 minutes;

[0115] (2) The iron removal process is: after cooling down to 630°C in 35 minutes, the temperature is raised to 705°C in 30 minutes;

[0116] (3) Electromagnetic field is applied during the casting process, the conditions are: frequency f=4Hz, average current I=20A, duty cycle d=10%.

[0117] Its macroscopic organization is as Figure 23 As shown, the grain size fraction of different parts such as Figure 24 shown. It can be seen that compared with Example 1, the ingot is clearly divided from the outside and the inside into a sharply cooled fine-grained region with a very thin surface, a columnar crystal region and an equiaxed fine-grained region. Although the columnar crystal region is all widened, it is equiaxed The coarse grain...

Embodiment 3

[0119] Method is with embodiment 1, and difference is:

[0120] (1) Carry out the second refining treatment at 730°C, and the refining time is 20 minutes;

[0121] (2) The iron removal process is: after cooling down to 630°C in 40 minutes, the temperature is raised to 700°C in 25 minutes;

[0122] (3) A rectangular groove with a concave bottom with a cross section of 180mm×120mm;

[0123] (4) In a rectangular mold with a casting mold size of 322mm×218mm, the casting speed is controlled to be 52mm / min, the water volume is 400L / min, and the casting temperature is 700C;

[0124] (5) Electromagnetic field is applied during the casting process, the conditions are: frequency f=4Hz, average current I=40A, duty cycle d=20%.

[0125] Its macroscopic organization is as Figure 25 As shown, the grain size fraction of different parts such as Figure 26 shown. It can be seen that compared with Example 1, the ingot is clearly divided into a sharply chilled fine-grained region, a columnar...

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Abstract

The invention discloses an electromagnetic semicontinuous casting device and a casting method thereof. The electromagnetic semicontinuous casting device comprises a crucible smelting furnace, a crucible standing furnace, a flow control mechanism, a split-flow device, an electromagnetic crystallizer system and a vertical semicontinuous casting machine, wherein the electromagnetic crystallizer system is a metal inner sleeve crystallizer system in which a group of build-in excitation coil is fixed, and comprises a metal inner sleeve, a cooling water cavity, the excitation coil, an oil supply system, an oil distribution system and a protective gas ring. According to the electromagnetic semicontinuous casting device disclosed by the invention, through a method of adjusting the frequency of electrical current, duty ratio and average current strength, the electrical current in a unique wave shape is formed in the single excitation coil placed in the cooling cavity of a crystallizer, so that desired forced convection or shaking effect is formed in the crystallizer with low current intensity; the grain of ingot blank is significantly refined; and columnar crystals are significantly reduced or eliminated to lower macroscopic segregation and realize the technical effect of low-stress casting. Under the condition of similar functional effects, the size of the electromagnetic crystallizer system is one third to one half of that of an original electromagnetic crystallizer system.

Description

technical field [0001] The invention belongs to the field of metal material preparation, and specifically relates to a casting device and a casting method for realizing semi-continuous casting ingot structure refinement and component homogenization by applying an electromagnetic field. Background technique [0002] Magnesium alloys have the advantages of low density, high specific strength, large specific modulus of elasticity, good heat dissipation, good shock absorption, greater impact load capacity than aluminum alloys, and good resistance to organic matter and alkali corrosion, so magnesium alloys are used in transportation. It has broad application prospects in the fields of transportation, weaponry, aerospace, computer communications, and consumer electronics. However, magnesium alloys have problems such as low strength, poor plastic deformation ability, and poor corrosion resistance, which have become obstacles to expanding the application of magnesium alloys. The ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/115B22D11/14B22D11/116B22D11/041
CPCB22D11/001B22D11/041B22D11/115B22D11/116B22D11/141
Inventor 乐启炽侯健贾永辉王熙博宝磊张志强
Owner NORTHEASTERN UNIV
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