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Electromagnetic stirring device and method for improving casting blank liquid core feeding capacity and center quality

A technology of electromagnetic stirring and casting slabs, which is applied in the field of electromagnetic stirring devices, can solve the problems of reducing the power and effect of electromagnetic stirring, no obvious increase in magnetic field strength, restricting temperature and solute homogenization, etc., to achieve enhanced temperature and solute uniformity The effects of simplification, overall structure and volume reduction, and widening of the liquid core channel

Pending Publication Date: 2021-06-18
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent 201110160188.2 and Chinese patent 201910332302.1 achieve spiral electromagnetic stirring by tilting the yoke end face or iron core at a certain angle, but the magnetic field strength does not increase significantly
However, it can be seen from its electromagnetic stirring device and its arrangement scheme that the width of a single or two opposed rectangular, U-shaped or semicircular LEMS devices is greater than or equal to the width or diameter of the slab, especially in When the width or diameter of the liquid core at the end of the slab solidification is small, its magnetic pole width is much larger than the width or diameter of the slab liquid core at the location of the LEMS, which makes a large part of the electromagnetic field generated by it act on the solid at the edge of the slab. Phase area, which will greatly reduce the power and effect of electromagnetic stirring
Furthermore, the LEMS device is only arranged on one side of the slab or oppositely arranged on both sides. Due to the limitation of the space environment such as the manufactured LEMS device and the cooling system around the slab, it drives the melt in the slab liquid core along the direction of the slab. The height and intensity of the upward or downward forced convection movement of the centerline are greatly restricted, which restricts the mixing of the melt with a relatively higher temperature in the upper part of the slab and the lower part of the melt and the degree of homogenization of temperature and solute , the feeding of the high-temperature melt in the upper part of the slab to the solidification and shrinkage of the lower melt is not sufficient

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  • Electromagnetic stirring device and method for improving casting blank liquid core feeding capacity and center quality
  • Electromagnetic stirring device and method for improving casting blank liquid core feeding capacity and center quality
  • Electromagnetic stirring device and method for improving casting blank liquid core feeding capacity and center quality

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Effect test

Embodiment 1

[0047] In this embodiment, the numerical simulation calculation method is adopted, and the narrow-width magnetic pole V-LEMS and the equal-width magnetic pole V-LEMS are respectively arranged according to the following three types. The upper and lower circulation motion of the melt in the slab liquid core of the casting machine, and the influence of different V-LEMS.

[0048] Type I: V-LEMS is set inside the slab at a distance of 6500mm from the free liquid surface of molten steel in mold 5 (such as Figure 7 shown);

[0049] Type II: V-LEMS are installed on the inside and outside of the slab at a distance of 6500mm from the free liquid surface of molten steel in mold 5 (such as Figure 8 shown);

[0050] Type Ⅲ: Set V-LEMS-1 and V-LEMS-2 respectively on the inner side of the slab in the areas 6500mm and 5600mm away from the free liquid surface of molten steel in mold 5 (such as Figure 11 shown).

[0051] The steel type is Q235, the slab width is 200mm, the slab liquid co...

Embodiment 2

[0056] In this embodiment, a numerical simulation calculation method is used to compare and analyze the temperature change in the liquid core of the arc-shaped continuous casting slab under the action of no electromagnetic stirring and constant-amplitude magnetic pole V-LEMS. The steel grade is GGr15, the cross-sectional size of the slab is 260mm×300mm, the casting speed is 0.65m / min, and the thickness of the slab shell during solidification is determined according to the solid phase ratio of 0.68.

[0057] Equal-amplitude magnetic poles V-LEMS-1 and equal-amplitude magnetic poles V-LEMS-2 are set on the inside of the slab 7280mm and 6380mm away from the free liquid surface of the molten steel in the mold, respectively (such as Figure 13As shown in b), form the V-LEMS electromagnetic stirring method combined up and down along the inner side of the slab. The parameters of the electromagnetic stirrer are: the current intensity is 400A, the frequency is 8Hz, the direction of the...

Embodiment 3

[0061] In this embodiment, through continuous casting experiments, the effects of different electromagnetic stirring methods on the solidification structure of the alloy are compared and analyzed. The electromagnetic stirring method I is to install a rotating electromagnetic stirring device (REMS) at the upper part of the vertical continuous casting machine 400 mm away from the free liquid surface of the mold, and not to install an electromagnetic stirring device at the lower part of the casting machine. The height of the REMS is 450 mm, and the number of magnetic poles is 6. Electromagnetic stirring method II is to set the equal-amplitude magnetic pole V-LEMS-2 on the upper part of the vertical continuous casting machine 400mm away from the free liquid surface of the mold, and set the equal-amplitude magnetic pole on the lower part of the vertical continuous casting machine 800mm away from the free liquid surface of the mold The V-LEMS-1 device constitutes the V-LEMS electrom...

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Abstract

The invention discloses an electromagnetic stirring device and method for improving the casting blank liquid core feeding capacity and center quality, The device is a V-LEMS mainly composed of a coil, a magnetic pole, a magnet yoke and a magnetic gathering cover, the magnetic pole width of the V-LEMS is smaller than or equal to the breadth of a casting blank facing the V-LEMS, and the end width of the magnetic pole is smaller than the breadth of the casting blank facing the V-LEMS, larger than or equal to the breadth of a casting blank liquid core facing the V-LEMS, and meanwhile the width of the end of the magnetic pole is smaller than or equal to the width of the magnet yoke, so that an electromagnetic field of the electromagnetic stirring device acts on a liquid core area of a casting blank in a concentrated mode, and the height and strength of up-down circulation motion or spiral motion of a casting blank liquid core melt are increased through different combination arrangement modes of the V-LEMS, mixing of the upper melt and the lower melt of the casting blank and homogenization of the temperature and solute are promoted, the feeding capacity of the upper melt for solidification and shrinkage of the lower melt is improved, the defects of center segregation, looseness, shrinkage cavities, cracks and the like of the casting blank are relieved or eliminated, and the quality of the casting blank and rolled metal is improved.

Description

technical field [0001] The invention belongs to the technical field of metallurgy and material electromagnetic preparation, and in particular relates to an electromagnetic stirring device and method for improving the feeding capacity and center quality of a slab liquid core. Background technique [0002] During the solidification process of the slab, especially at the end of the slab solidification, the liquid core channel in the slab becomes narrower and narrower, especially for special steels and high carbon steels and other steels with high viscosity and poor fluidity. , resulting in poor feeding conditions and ability of the upper melt to solidify and shrink the lower melt, which can easily cause defects such as shrinkage cavities, porosity, center segregation and cracks in the central area of ​​the cast slab, making it difficult for subsequent processing and rolling It is difficult to eliminate during the manufacturing process, which seriously affects the quality and pe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/12B22D11/115
CPCB22D11/122B22D11/115C22C38/06C22C38/50
Inventor 王恩刚王泽鹏张林
Owner NORTHEASTERN UNIV