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Modulated electromagnetic stirring of metals at advanced stage of solidification

A technology for electromagnetic stirring, modulating magnetic fields, applied in chemical instruments and methods, chemical/physical processes, transportation and packaging, etc., which can solve problems such as limiting usefulness

Inactive Publication Date: 2011-02-23
ABB (SCHWEIZ) AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These modulation methods have proven effective at modulation periods of about 10 seconds, which also limits their usefulness in the continuous casting of billets and ingots

Method used

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  • Modulated electromagnetic stirring of metals at advanced stage of solidification
  • Modulated electromagnetic stirring of metals at advanced stage of solidification
  • Modulated electromagnetic stirring of metals at advanced stage of solidification

Examples

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Embodiment Construction

[0030] figure 1 is a schematic cross-sectional view of a continuous casting machine 10 including an EMS system 12 illustrating one embodiment of the present invention. The casting machine 10 includes a hopper 14 from which molten metal, such as liquid steel, is conveyed through a submerged inlet nozzle 20 into a mold 18 . A strand 22 with an outer shell surrounding the melt 41 is formed in the mold 18 . Strand 22 exits from the bottom of mold 18 .

[0031] The example EMS system 12 generally includes at least one electromagnetic stirrer 24 disposed about the mold 18 . The stirrer 24 should be arranged within the mold shell or can be encased in a shell (not shown) surrounding the mold. As will become apparent, the stirrer 24 is arranged to induce a stirring motion within the melt inside the mold 18 during the early solidification stage. In the illustrated embodiment, only one stirrer 24 is arranged around the mold 18 to induce rotational stirring of the melt in the mold 18 ...

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Abstract

A method and apparatus for electromagnetic stirring of molten metals at an advanced stage of solidification, as may be used in continuous casting of steel billets and blooms, are disclosed. At least first and second stirrers are provided for generating first and second rotating magnetic fields of a differing frequency about an axis of solidifying molten metal. The stirrers are arranged about the molten metal in sufficiently close proximity to each other so that their respective magnetic fields superpose to produce a modulated magnetic field. The magnetic fields of the respective stirrers may either have common or opposing rotational directions. The modulated stirring produced by the magnetic fields results in oscillating primary and secondary flows and hence turbulence within the melt bulk in the region wherein temperature of the melt on its central axis is below the liquidus level and at least 10% of substantially solidified material is formed. Turbulent flow created by this stirring method disrupts formation of crystalline structures in the melt bulk and mixes solute enriched melt of the central region with the bulk volume which subsequently results in improvements of the solidification structure and overall internal quality of the cast products.

Description

technical field [0001] The present invention relates to electromagnetic stirring, and more particularly to electromagnetic stirring of liquid metals as they solidify. The invention can be used for continuous casting of steel, alloy or other metal melts and other solidification processes of these materials. Background technique [0002] Electromagnetic stirring (EMS) is commonly used in the production of continuously cast billets, ingots, etc., casting of different alloys, and other liquid metal casting and processing. Typically, an alternating current is applied to an induction coil surrounding the melt. The alternating current excites a continuously rotating alternating electromagnetic field that stirs the metal, eg in the production of continuous cast billets and ingots. For example, an alternating field can stir the melt in a continuous casting mold during the early solidification phase. [0003] The rotational agitation of the melt in the mold creates turbulence and s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/115B01F13/08B22D27/02
CPCB22D11/122B01F13/0809B22D11/115B01F33/451
Inventor L·S·贝特尔曼J·D·拉弗斯C·P·柯伦G·塔尔巴克(已故)
Owner ABB (SCHWEIZ) AG
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