EP1833628A1 - Appareil de coulage continu de billetes ou de plaques de magnesium au moyen d'un champ electromagnetique et son procede de fabrication - Google Patents

Appareil de coulage continu de billetes ou de plaques de magnesium au moyen d'un champ electromagnetique et son procede de fabrication

Info

Publication number
EP1833628A1
EP1833628A1 EP05821971A EP05821971A EP1833628A1 EP 1833628 A1 EP1833628 A1 EP 1833628A1 EP 05821971 A EP05821971 A EP 05821971A EP 05821971 A EP05821971 A EP 05821971A EP 1833628 A1 EP1833628 A1 EP 1833628A1
Authority
EP
European Patent Office
Prior art keywords
mold
continuous casting
magnesium
electromagnetic field
slab
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP05821971A
Other languages
German (de)
English (en)
Other versions
EP1833628A4 (fr
Inventor
Joon-Pyo Park
Myoung-Gyun Kim
Gyu-Chang Lee
U-Sok Yoon
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Jeonnam Advanced Material Support Center
Research Institute of Industrial Science and Technology RIST
Original Assignee
Jeonnam Advanced Material Support Center
Research Institute of Industrial Science and Technology RIST
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from KR1020040111235A external-priority patent/KR100679313B1/ko
Priority claimed from KR1020040111236A external-priority patent/KR100721874B1/ko
Application filed by Jeonnam Advanced Material Support Center, Research Institute of Industrial Science and Technology RIST filed Critical Jeonnam Advanced Material Support Center
Publication of EP1833628A1 publication Critical patent/EP1833628A1/fr
Publication of EP1833628A4 publication Critical patent/EP1833628A4/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/001—Continuous casting of metals, i.e. casting in indefinite lengths of specific alloys
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/10—Supplying or treating molten metal
    • B22D11/11—Treating the molten metal
    • B22D11/114—Treating the molten metal by using agitating or vibrating means
    • B22D11/115—Treating the molten metal by using agitating or vibrating means by using magnetic fields

Definitions

  • the present invention relates to an apparatus for continuous casting of magnesium billets or slabs using an electromagnetic field, which can compensate small solidification latent heat of magnesium, and control a solidification speed via application of a high or low frequency electromagnetic field, thereby enabling continuous casting, and a method thereof.
  • the present invention relates to an apparatus for continuous casting of magnesium billets or slabs using an electromagnetic field, which can compensate small solidification latent heat of magnesium, and control a solidification speed by heating molten metal via application of a low frequency electromagnetic field to the molten metal upon continuous casting of magnesium, and which comprises a low frequency electromagnetic stirring device positioned below a mold, thereby producing a billet having an enhanced quality at high casting speeds without surface defects, and a method thereof.
  • the present invention relates to an apparatus for continuous casting of magnesium billets or slabs using an electromagnetic field, which is adapted to apply a high frequency electromagnetic field to a specific mold during continuous casting of magnesium, and comprises a low frequency electromagnetic stirring device positioned at a lower portion of the mold, thereby producing a billet having an enhanced quality at high casting speeds without surface defects, and a method thereof.
  • Magnesium alloy is light-weight metal, and widely applied to various fields from light-weight components for transportation to components in electronics for information and communication due to its excellent physical properties such as high specific strength, excellent electromagnetic interference (EMI) shielding, excellent heat dissipation and vibration damping capability. Since magnesium is rapidly solidified during casting due to its very small solidification latent heat, it cannot be cast via a general continuous casting method.
  • EMI electromagnetic interference
  • MGACAST was developed by LKR in Austria. This method was designed for continuous casting of the magnesium billet by enhancing a conventional direct chill (DC) casting method used for continuous casting of aluminum. Since this method results in lots of defects on the surface of an as-cast billet, there are problems in that a scarfing process is required to remove the defects from the surface of the billet, and that casting speed is very low.
  • DC direct chill
  • the present invention has been made in view of the above problems, and it is an object of the present invention to provide an apparatus for continuous casting of magnesium billets or slabs using an electromagnetic field, which can prevent various surface defects from being created during casting, increase casting speed, reduce inner defects by forming an equiaxial structure, and enhance productivity, and to provide a method thereof.
  • an apparatus for continuous casting of magnesium billets or slabs using an electromagnetic field comprising: a mold for continuous casting of an as-cast billet or slab; a coil positioned outside the mold and adapted to allow electric current to be applied thereto; and a cooling nozzle positioned outside the mold and the as-cast billet or slab.
  • low frequency electric current is applied to the coil, and the mold is provided with a replaceable ring at an upper portion inside the mold.
  • the ring is made of graphite.
  • the mold has a circular or rectangular cross-section, and the coil is positioned to surround the mold.
  • the cooling nozzle cools the mold, the coil, and the as-cast billet or slab by directly spraying water thereto.
  • an apparatus for continuous casting of magnesium billets or slabs using an electromagnetic field comprises: a mold having a slit formed therein for continuous casting of an as-cast billet or slab; a coil positioned outside the mold and adapted to allow electric current to be applied thereto; and an electromagnetic stirring device positioned at a lower portion of the mold.
  • the mold has segments partitioned by the slit, and a cooling water passageway formed in the segments.
  • the slit is formed at a central region of the mold, and extends from below an upper end of the mold to above a lower end thereof.
  • the slit has a width of 0.2 ⁇ 0.3 D, and is filled with ceramic bonds to allow the electromagnetic field to be applied to molten metal within the mold while preventing leakage of the molten metal.
  • the mold has a circular or rectangular cross-section, and the coil is provided to surround the mold.
  • the apparatus further comprises a cooling nozzle between the mold and the electromagnetic stirring device.
  • the cooling nozzle cools the as-cast billet or slab, and the elec- tromagnetic stirring device by directly spraying water thereto.
  • the apparatus comprises a mold formed of copper or copper alloys having a good electrical conductivity, a coil positioned outside the mold to apply an electromagnetic field to the mold during casting of magnesium to perform induction heating of molten magnesium within the mold while reducing a contact pressure between the mold and a solidified cell by virtue of electromagnetic pressure, thereby preventing surface defects from being created during casting, and an electromagnetic stirring device positioned at a lower portion of the mold to increase casting speed and a depth of pool within the mold.
  • the present invention employs a low frequency electromagnetic field upon magnesium casting, and comprises a mold formed of copper, copper alloys or aluminum having a good electrical conductivity and a coil positioned outside the mold to apply an electromagnetic field to the mold to perform induction heating of molten magnesium with the electromagnetic field while stirring the molten metal by means of the low frequency electromagnetic field, thereby enabling continuous casting.
  • Fig. 1 is a conceptual diagram illustrating an apparatus for continuous casting of magnesium billets or slabs using an electromagnetic field in accordance with a first embodiment of the present invention, which comprises a circular mold, and a coil adapted to allow low frequency electric current to be applied thereto;
  • FIG. 2 is a plan view illustrating the apparatus in accordance with the first embodiment, which comprises the circular mold, and the coil adapted to allow the low frequency electric current to be applied thereto;
  • FIG. 3 is a conceptual diagram illustrating an apparatus for continuous casting of magnesium billets or slabs using an electromagnetic field in accordance with a second embodiment of the present invention, which comprises a circular mold, and a coil adapted to allow high frequency electric current to be applied thereto;
  • FIG. 4 is a plan view illustrating the apparatus in accordance with the second embodiment, which comprises the circular mold, and the coil adapted to allow the high frequency electric current to be applied thereto;
  • FIGs. 5a and 5b are views illustrating a modification of the apparatus in accordance with the second embodiment which comprises a rectangular mold
  • FIG. 6 is an explanatory view illustrating a direction of electric current and electromagnetic field generated in the mold of the apparatus in accordance with the present invention
  • Fig. 7 is an explanatory view comparing surfaces of molten metal achieved by a conventional casting technique and by applying low frequency electric current and high frequency electric current with the apparatus in accordance with the present invention.
  • Figs. 8a and 8b are photographs showing surfaces of magnesium billets produced by the conventional technique and by the apparatus in accordance with the present invention, respectively.
  • Fig. 1 is a conceptual diagram illustrating an apparatus for continuous casting of magnesium billets or slabs using an electromagnetic field in accordance with a first embodiment of the present invention.
  • an apparatus 1 for continuous casting of the magnesium billets or slabs using the electromagnetic field comprises a mold 11 for solidifying molten metal 15, a coil 12 positioned outside the mold 11 and adapted to allow low frequency electric current to be applied thereto, a ring 13 positioned on an inner upper surface of the mold 11 for controlling solidification of the molten metal and enabling smooth casting, and a cooling water spray nozzle 16 for cooling the ring 13, an as-cast billet or slab 14, and the mold 11.
  • FIG. 2 is a plan view illustrating the apparatus for continuous casting of the magnesium billets or slabs using the electromagnetic field according to the first embodiment.
  • the mold 11 and the coil 12 are illustrated as having a circular cross- section in the drawing, the mold 11 and the coil 12 may have a rectangular cross- section or others.
  • Such induced current serves not only to heat the molten metal via Joule heating, but also to generate electromagnetic force in the molten metal via interaction with the magnetic field.
  • cooling effect by cooling water is reduced at an initial solidified cell of the molten metal, thereby enabling stable solidification of the molten metal to be achieved.
  • the electromagnetic force generated within the molten metal 15 has a gradient that the electromagnetic force is large on the surface of the molten metal, and small at an inner portion of the molten metal, and causes the molten metal to be stirred within the mold, thereby enhancing the inner structure of the billet.
  • the mold 11 is made of a material, such as aluminum or copper alloys, having a good electrical conductivity.
  • the ring 13 made of graphite may be inserted into the mold 11 to provide lubrication effect conducive to good casting of the as-cast billet or slab while delaying cooling of the as-cast billet or slab.
  • the ring 13 has a length from an upper portion of the mold to approximately 20mm below the surface of the molten metal, and a thickness of 2 D or more.
  • the ring 13 can be replaced with new ones when being damaged.
  • the ring 13 delays cooling of the molten metal, while reducing friction between the as-cast billet or slab and the mold by virtue of exothermic effect and heat transfer lowering effect of graphite resulting from interaction with the electromagnetic field.
  • the low frequency electromagnetic field applied to the coil 12 has a frequency of 2
  • ⁇ 1,000 D which is determined according to the size of the as-cast billet or slab.
  • the intensity of electric current is also determined by the size of the as-cast billet or slab, and casting speed.
  • Cooling of the mold 11 and the as-cast billet or slab 14 is performed by direct cooling via the cooling water spray nozzle 16. Cooling water cools the mold 11, the ring 13 within the mold 11, and the coil 12 at the same time.
  • FIG. 3 is a conceptual diagram illustrating an apparatus for continuous casting of magnesium billets or slabs using an electromagnetic field in accordance with a second embodiment of the present invention.
  • an apparatus 100 for continuous casting of the magnesium billet or slab using the electromagnetic field comprises a mold 101 for solidifying molten metal 105, a coil 102 positioned outside the mold 101 and adapted to allow high frequency electric current to be applied thereto, an electromagnetic stirring device 103 positioned at a lower portion of the mold 101 for stirring the molten metal 105, and a nozzle 104 between the mold 101 and the stirring device 103 for cooling an as-cast billet or slab 106 by spraying a refrigerant.
  • the mold 101 has a cooling water passageway 107 formed therein through which cooling water is circulated, and a manifold 108 attached thereto for supplying and discharging the cooling water.
  • Fig. 4 is a plan view illustrating the apparatus 100 for continuous casting of the magnesium billet or slab using the electromagnetic field according to the second embodiment.
  • the mold 101 and the coil 102 are illustrated as having a circular cross- section in the drawing, the mold 101 and the coil 102 may have a rectangular cross- section or others.
  • the mold 101 is formed with slits 109 in a casting direction in order to allow a high frequency electromagnetic field to be applied to molten magnesium. As shown in Fig. 3, each of the slits 109 is formed in an intermediate region of the mold 101 such that each slit 109 extends from below an upper end of the mold 101 to above a lower end thereof. The length of the slits 109 is determined in the range not to provide an adverse influence on rigidity of the mold 101.
  • Each of the slits 109 has a width of 0.1 D or more, and preferably in the range of 0.2
  • the number of slits 109 is determined in the range not to provide an adverse influence on rigidity of the mold 101.
  • Each slit 109 is provided for induction of high frequency, and preferably filled with ceramic bonds and the like to prevent leakage of the molten metal 105.
  • the high frequency electromagnetic field has a very small penetration depth in the molten metal, it is difficult to apply the high frequency electromagnetic field into the mold 101 made of copper. Thus, the slits 109 are machined in the mold 101 to allow the high frequency electromagnetic field to be effectively applied to the molten metal 105.
  • the low frequency electromagnetic field has a large penetration depth in the molten metal, it can be applied to the molten metal within the copper mold. Thus, it is not necessary to form the slits in the mold.
  • FIGs. 5a and 5b are views illustrating a rectangular mold 101' of the apparatus for continuous casting of the magnesium billet or slab using the electromagnetic field according to the second embodiment.
  • Fig. 5a is a front view of the rectangular mold 101' in which slits 109' are formed in an intermediate region of the mold, and extend from below an upper end of the mold 101' to above a lower end thereof.
  • the length of the slits 109' is determined in the range not to provide an adverse influence on rigidity of the mold 101'.
  • Each of the slits 109' has a width of 0.1 D or more, and the number of slits 109' is determined in the range not to provide an adverse influence on rigidity of the mold.
  • Fig. 5b is a cross-sectional view taken along line A-A' of Fig. 5a, in which an independent cooling water passageway 107' for cooling the mold 101' is formed in each segment 110' separated by the slits.
  • Such induced current serves not only to heat the molten metal 105 via Joule heating, but also to generate electromagnetic force in the molten metal 105 via interaction with the magnetic field.
  • the electromagnetic force increases a curvature of a surface S of the molten metal 105 (see Fig. 3) where the molten metal 105 contacts the mold 101, while reducing a contact pressure between the as-cast billet or slab 106 and the mold 101.
  • the surface of the molten metal is intensively heated via Joule heating, thereby enabling control of a solidification speed while increasing solidification latent heat, so that continuous casting can be performed without defects caused by uneven solidification and quenching.
  • the apparatus 100 for continuous casting of the magnesium billet or slab using the electromagnetic field according to the second embodiment is further provided with a nozzle 104 attached to the lower portion of the mold 101 to cool the as-cast billet or slab 106 by directly spraying gas or water thereto.
  • the apparatus of the second embodiment may further comprise an electromagnetic stirring device 103 attached to the lower portion of the mold 101 for stirring the molten metal 106 in order to provide a function of controlling the inner quality thereof.
  • Fig. 7 is an explanatory view comparing surfaces of molten metal achieved by a conventional casting technique and by applying low frequency electric current and high frequency electric current with the apparatus in accordance with the present invention.
  • a high frequency electromagnetic field has a shallow penetration depth due to the properties of high frequency, and is thus concentrated on the surface of the molten metal, so that the surface of the molten metal has a very large radius of curvature. As a result, it is possible to reduce friction between the as -cast billet or slab and the mold.
  • the apparatus of the invention is provided with the electromagnetic stirring device to enhance the inner quality of the molten metal.
  • the low frequency electromagnetic field has a deep penetration depth, and thus interacts with a deep portion of the molten metal, thereby increasing the stirring effect.
  • the low frequency electric current provides a lower effect of enhancing the surface quality. Irrespective of the lower surface quality enhancing effect, the apparatus of the invention employing the low frequency electric current has a merit of low installation costs.
  • Figs. 8a and 8b are photographs showing surfaces of as-cast billets 106 produced after melting AZ31 magnesium alloy.
  • Fig. 8a is the photograph showing the surface of the as-cast billet 106, to which an electromagnetic field is not applied, according to the conventional technique.
  • the as-cast billet 106 has lots of surface defects, and cannot be produced by normal casting operation.
  • Fig. 8b is the photograph showing the surface of the as-cast billet 106 to which an electromagnetic field is applied according to the present invention.
  • the as-cast billet 106 has no surface defects, and can be produced by increasing casting speed to 0.4 m/ min or more.
  • the present invention provides advantageous effects in that a magnesium or magnesium alloy as-cast billet or slab having enhanced inner quality can be produced at an increased casting speed without surface defects.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)

Abstract

L’invention concerne un appareil de coulage continu de billettes ou de plaques de magnésium au moyen d’un champ électromagnétique et son procédé de fabrication, permettant de compenser la faible chaleur latente de solidification du magnésium, de moduler la vitesse de solidification et de mélanger le métal en fusion dans un moule au moyen d’un champ électromagnétique pour réaliser ainsi un coulage continu. L’appareil comprend un moule de coulage continu d’une billette ou d’une plaque brute de coulée, une bobine placée à l’extérieur du moule et conçue pour lui appliquer un courant électrique, et une buse de refroidissement placée à l’extérieur du moule et de la billette ou de la plaque brute de coulée. Durant le coulage, un courant électrique d’une fréquence comprise entre 2 et 1000 D ou un courant électrique de 50 à 10,000 A d’une fréquence comprise entre 200 et 200000 D est appliqué à la bobine. L’invention permet de fabriquer à grande vitesse une billette ou une plaque de magnésium de meilleure qualité interne et dépourvue de défauts de surface par application d’un champ électromagnétique à basse ou haute fréquence au moule durant le coulage continu du magnésium.
EP05821971A 2004-12-23 2005-12-22 Appareil de coulage continu de billetes ou de plaques de magnesium au moyen d'un champ electromagnetique et son procede de fabrication Withdrawn EP1833628A4 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
KR1020040111235A KR100679313B1 (ko) 2004-12-23 2004-12-23 고주파 전자기장을 이용한 마그네슘 빌렛 또는 슬래브 연속주조장치
KR1020040111236A KR100721874B1 (ko) 2004-12-23 2004-12-23 저주파 전자기장을 이용한 마그네슘 빌렛 또는 슬래브 연속주조장치
PCT/KR2005/004438 WO2006068424A1 (fr) 2004-12-23 2005-12-22 Appareil de coulage continu de billettes ou de plaques de magnesium au moyen d’un champ electromagnetique et son procede de fabrication

Publications (2)

Publication Number Publication Date
EP1833628A1 true EP1833628A1 (fr) 2007-09-19
EP1833628A4 EP1833628A4 (fr) 2009-03-18

Family

ID=36601976

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05821971A Withdrawn EP1833628A4 (fr) 2004-12-23 2005-12-22 Appareil de coulage continu de billetes ou de plaques de magnesium au moyen d'un champ electromagnetique et son procede de fabrication

Country Status (4)

Country Link
US (1) US20080179038A1 (fr)
EP (1) EP1833628A4 (fr)
JP (1) JP2008525197A (fr)
WO (1) WO2006068424A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1992344A1 (fr) * 2007-05-18 2008-11-19 Institut Curie P38 alpha comme cible therapeutique pour les maladies associées á une mutation de FGFR3
JP5564652B2 (ja) * 2008-12-11 2014-07-30 国立大学法人 熊本大学 鋳造装置、鋳造方法及びマグネシウム合金ビレットの製造方法
CN102950273B (zh) * 2011-08-22 2014-07-09 中国科学院金属研究所 一种具有弥散相表面层的偏晶合金复合线材的制备方法
EP4076788B1 (fr) * 2019-12-20 2024-05-15 Novelis, Inc. Lingot d'alliages d'aluminium de la série 7xxx et procédé de coulée directe par refroidissement
CA3162706A1 (fr) * 2019-12-20 2021-06-24 Novelis Inc. Taille de grain final reduite de materiau corroye non recristallise produit par l'intermediaire de la voie de refroidissement direct (dc)
CN117564231A (zh) * 2023-10-24 2024-02-20 湖南镁宇科技有限公司 一种aq80m镁合金超大锭坯及其制备方法和应用

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GB2016977A (en) * 1978-03-23 1979-10-03 Voest Ag Cooled continuous casting mould with electromagnetic stirring
JPS63149056A (ja) * 1986-12-10 1988-06-21 Kobe Steel Ltd 非鉄金属の連続鋳造方法
US20010042609A1 (en) * 1999-01-13 2001-11-22 Alfredo Poloni High speed continuous casting device and relative method
KR20030017025A (ko) * 2001-08-23 2003-03-03 재단법인 포항산업과학연구원 전자기주조에서 몰드 및 주편 냉각 장치
KR20050064741A (ko) * 2003-12-24 2005-06-29 재단법인 포항산업과학연구원 슬릿 몰드를 이용한 전자기교반과 전자기주조 장치를겸비한 알루미늄 전자기주조장치

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JPS61119359A (ja) * 1984-11-15 1986-06-06 Showa Alum Ind Kk マグネシウムまたはその合金の連続鋳造法
FR2585597B1 (fr) * 1985-07-30 1987-10-09 Pechiney Aluminium Procede et dispositif de coulee en charge de metaux
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Publication number Priority date Publication date Assignee Title
GB2016977A (en) * 1978-03-23 1979-10-03 Voest Ag Cooled continuous casting mould with electromagnetic stirring
JPS63149056A (ja) * 1986-12-10 1988-06-21 Kobe Steel Ltd 非鉄金属の連続鋳造方法
US20010042609A1 (en) * 1999-01-13 2001-11-22 Alfredo Poloni High speed continuous casting device and relative method
KR20030017025A (ko) * 2001-08-23 2003-03-03 재단법인 포항산업과학연구원 전자기주조에서 몰드 및 주편 냉각 장치
KR20050064741A (ko) * 2003-12-24 2005-06-29 재단법인 포항산업과학연구원 슬릿 몰드를 이용한 전자기교반과 전자기주조 장치를겸비한 알루미늄 전자기주조장치

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See also references of WO2006068424A1 *

Also Published As

Publication number Publication date
EP1833628A4 (fr) 2009-03-18
JP2008525197A (ja) 2008-07-17
US20080179038A1 (en) 2008-07-31
WO2006068424A1 (fr) 2006-06-29

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