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A composite spiral electromagnetic stirrer

A spiral electromagnetic stirring and composite technology, which is applied in the fields of electromagnetic casting and electromagnetic processing and forming of materials, can solve the problems such as the inability to realize spiral stirring, and achieve the effects of uniform solidification shell thickness, strong controllability and reduction of temperature gradient.

Active Publication Date: 2020-09-29
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Neither of these two types of methods can achieve effective spiral stirring

Method used

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  • A composite spiral electromagnetic stirrer
  • A composite spiral electromagnetic stirrer
  • A composite spiral electromagnetic stirrer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] like figure 1 , 2 As shown, the billet 1 adopts a bloom with a section size of 450mm×370mm. The yoke group of the composite spiral electromagnetic stirrer is composed of two different independent yokes. They are rotating magnetic field yoke and traveling wave magnetic field yoke respectively. The yoke set is made of oriented silicon steel with good magnetic permeability, low coercive force and low magnetic loss.

[0055] like image 3 , 4 As shown, the rotating magnetic field yoke back 5 is a thin-walled cylinder with an inner diameter of 1280mm, an outer diameter of 1360mm and a height of 440mm. The traveling wave magnetic field yoke back 6 is a cube of 440mm×360mm×15mm, and there are two in total, which are symmetrically distributed on both sides of the billet 1 . There are 4 ends 3 of the rotating magnetic field yoke, and the size of the end face of the yoke is a rectangle of 440mm×360mm; 60゜. A total of 8 traveling wave magnetic field yoke ends 7 are vertica...

Embodiment 2

[0060] This example is the same as Example 1 in the way and size of the load applied, and the power supply mode is the same, the difference is that the traveling wave magnetic field yoke is added, and the vertical stirring direction is guaranteed to be different. The streamline distribution at the Z=0 longitudinal section of the slab under the action of the 4-2×4 compound spiral electromagnetic stirrer, such as Figure 21 Shown: The metal melt rotates at the cross section. After the alternating current is applied, the induced magnetic field interacts with the induced current to generate a spiral electromagnetic force. The spiral electromagnetic force is decomposed into horizontal and vertical forces, and the horizontal force drives the metal melt to do Rotational movement.

[0061] like Figure 22 As shown, the metal melt presents four upper and lower circulation movements on the longitudinal section, of which a relatively strong circulation flow plays a dominant role, and th...

Embodiment 3

[0063] Compared with Example 2, this example ensures that the vertical stirring direction is the same as above. like Figure 23 As shown, the metal melt also presents four circulation flows up and down in the longitudinal section, but compared with the flow in the lower part of the slab, the flow intensity in the upper part is stronger. This is because the vertical upward stirring force in the same direction strengthens the flow of the molten metal on the upper part of the slab, and the molten metal rises along the wall and flows down along the center of the slab after reaching the top.

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Abstract

The invention discloses a compound spiral electromagnetic stirrer, which can be widely used in the fields of electromagnetic processing of materials such as metal continuous casting and semi-solid casting. The characteristic of the invention is that the yoke group is composed of two different independent yoke groups; the yoke group is composed of a yoke back and several yoke ends; the yoke back includes a thin-walled cylindrical shape and a plate shape. kind of structure. The yoke ends are arranged on the backs of the two types of yokes respectively, and the yoke ends are evenly arranged on the outer periphery of the casting blank. The normal angle between the planes where all the yoke end faces are located is 30-75゜, and the polar surfaces of the magnetic poles are All point to the center of the slab. There is a 1-100mm gap between the two yoke backs. The power supply adopts two-phase or three-phase power supply, and one or two sets of power supplies can be used. When using two sets of power supplies, it is especially suitable for situations where large axial force requirements are required. The invention can drive the metal melt to perform spiral motion, achieve forced and uniform stirring of the metal melt, improve the quality of the cast slab, and suppress liquid level fluctuations.

Description

technical field [0001] The invention is applied to the field of electromagnetic casting and material electromagnetic processing and molding, and is especially aimed at the spiral magnetic field electromagnetic stirrer used in the process of metal continuous casting, semi-solid casting and directional solidification. Background technique [0002] The strict requirements and high standards of material performance force researchers to continuously develop new materials and research new processes. The electromagnetic field has irreplaceable advantages of other physical fields, and it has received extensive attention from scientific researchers. The electromagnetic field generating device can transmit heat and kinetic energy to the molten metal without direct contact with the molten metal, and the molten metal is not polluted. Electromagnetic stirring is an effective means to control the flow of molten metal to improve the quality of slab. Rotating electromagnetic stirring can ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/115B22D27/02
CPCB22D11/115B22D27/02
Inventor 邓安元李亮李阳王恩刚张兴武
Owner NORTHEASTERN UNIV LIAONING
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