Utilizing Magnetic Force Patents (Class 164/466)
  • Patent number: 10780490
    Abstract: An electromagnetic brake system for a metal-making process. The electromagnetic brake system includes a two-level magnetic structure, in particular an upper magnetic core structure configured to be mounted to an upper portion of a mold and a lower magnetic core structure configured to be mounted to a lower portion of a mold. Lateral coils on the upper magnetic structure are configured to be controlled to generate a first magnetic field in a first field direction and inner coils are configured to be controlled to generate a second magnetic field in a second field direction, simultaneously with the first magnetic field. The lower magnetic core structure has lower coils which are configured to be controlled to generate a third magnetic field in the first direction simultaneously as the lateral coils and the inner coils generate their fields.
    Type: Grant
    Filed: May 29, 2018
    Date of Patent: September 22, 2020
    Assignee: ABB Schweiz AG
    Inventors: Martin Tobias Sedén, Anders Lehman, Jan-Erik Eriksson
  • Patent number: 10710152
    Abstract: Provided is a meniscus flow control device that includes: a meniscus flow detection unit for detecting, in a meniscus flow form of molten steel, relative temperature values for positions measured by temperature measurers, and relatively comparing the temperature values measured by the temperature measurers to thereby determine the flow state of the molten steel meniscus to be normal or abnormal; a magnetic field generation unit, installed outside a mold, for generating a magnetic field and controlling the flow of the molten steel by the magnetic field; and a flow control unit for maintaining the operation of the magnetic field generation unit in the current state when the meniscus flow state detected by the meniscus flow detection unit is determined to be normal, and for controlling the magnetic field generation unit to adjust the meniscus flow to be normal when the detected meniscus flow state is determined to be abnormal.
    Type: Grant
    Filed: November 19, 2015
    Date of Patent: July 14, 2020
    Assignee: POSCO
    Inventors: Sang Woo Han, Seon Yong Jin, Hyun Jin Cho
  • Patent number: 10406597
    Abstract: Provided is a continuous casting method of steel that prevents a solidification completion position from being changed even when a drawing speed V of a cast slab is changed. The method includes drawing a cast slab by setting a drawing speed V0 while spraying cooling water to the cast slab at a cooling water spray amount W0 [kg/ton-cast slab]. Then, changing the drawing speed to the speed V1 while spraying cooling water to the cast slab at a cooling water spray amount W1 [kg/ton-cast slab]. The method further includes spraying cooling water to the cast slab at a cooling water spray amount Wt [kg/ton-cast slab] during a period of time t that is obtained by dividing a target length Lt by the drawing speed V0. The water spray amount Wt satisfying either formula (1): Wt<W1 under a condition of V1<V0, or formula (2): Wt>W1 under a condition of V1>V0.
    Type: Grant
    Filed: January 22, 2016
    Date of Patent: September 10, 2019
    Assignee: JFE STEEL CORPORATION
    Inventors: Keigo Toishi, Hiroyuki Ohno, Norichika Aramaki, Yuji Miki
  • Patent number: 9156084
    Abstract: The present invention relates to a process for controlling the distribution of liquid metal flows of in a crystallizer for the continuous casting of thin slabs. In particular, the process applies to a crystallizer comprising perimetral walls which define a containment volume for a liquid metal bath insertable through a discharger placed in the middle of the bath. The process includes arranging a plurality of electromagnetic brakes, each for generating a braking zone within said bath, and activating these electromagnetic brakes either independently or in groups according to characteristic parameters of the fluid-dynamic conditions of the liquid metal within the bath.
    Type: Grant
    Filed: August 4, 2011
    Date of Patent: October 13, 2015
    Assignee: Danieli & C. Officine Meccaniche S.p.A.
    Inventors: Fabio Guastini, Andrea Codutti, Michele Minen, Fabio Vecchiet
  • Patent number: 8985189
    Abstract: An arrangement for a continuous casting process. The arrangement includes a vessel having a first opening for receiving molten metal in the vessel, a second opening for discharging the molten metal from the vessel, and a body extending between the first opening and the second opening, a first magnetic arrangement attached to the body, the first magnetic arrangement having a magnetic core with legs, and coils arranged around the legs, and a power system configured to provide an alternating current superimposed on a carrier current to each of the coils, each pair of alternating current and carrier current provided to a coil forming a flow control current, wherein flow control currents provided to adjacent coils are phase shifted relative each other, thereby creating a travelling magnetic field in molten metal in the vessel. A corresponding method is also presented herein.
    Type: Grant
    Filed: June 20, 2014
    Date of Patent: March 24, 2015
    Assignee: ABB AB
    Inventors: Jan-Erik Eriksson, Hongliang Yang, Boo Eriksson
  • Publication number: 20140326427
    Abstract: A method and apparatus are provided to cast a metal ingot using a continuous casting mold so that the ingot is essentially free of gas pockets which otherwise would result from gas bubbles being entrapped in the mushy zone and solid portion of the ingot during formation, wherein such bubbles may be caused by pouring molten metal into a molten liquid portion of the forming ingot and by impingement of a plasma plume of a plasma torch on the upper surface of the molten liquid portion.
    Type: Application
    Filed: May 2, 2013
    Publication date: November 6, 2014
    Applicant: RTI International Metals, Inc.
    Inventors: Michael P. Jacques, Kuang-O Yu
  • Patent number: 8596334
    Abstract: In a method for continuously casting an extremely low carbon steel using a continuous casting machine, by adjusting the chemical components of extremely low carbon steel within a specified range by taking into account an interface tension gradient in a concentration boundary layer on a front surface of a solidified shell, and also by optimizing intensities of the DC magnetic fields applied to the upper magnetic poles and the lower magnetic poles respectively corresponding to a slab width of a slab to be casted and a casting speed, it is possible to acquire the slab having high quality not only with the small number of defects caused by the entrainment of bubbles, non-metallic inclusion and a mold flux into the molten steel.
    Type: Grant
    Filed: March 9, 2011
    Date of Patent: December 3, 2013
    Assignee: JFE Steel Corporation
    Inventors: Yuji Miki, Takeshi Murai, Hiroyuki Ohno
  • Publication number: 20130233505
    Abstract: In a method for continuously casting an extremely low carbon steel using a continuous casting machine, by adjusting the chemical components of extremely low carbon steel within a specified range by taking into account an interface tension gradient in a concentration boundary layer on a front surface of a solidified shell, and also by optimizing intensities of the DC magnetic fields applied to the upper magnetic poles and the lower magnetic poles respectively corresponding to a slab width of a slab to be casted and a casting speed, it is possible to acquire the slab having high quality not only with the small number of defects caused by the entrainment of bubbles, non-metallic inclusion and a mold flux into the molten steel.
    Type: Application
    Filed: March 9, 2011
    Publication date: September 12, 2013
    Applicant: JFE STEEL CORPORATION
    Inventors: Yuji Miki, Takeshi Murai, Hiroyuki Ohno
  • Publication number: 20130133852
    Abstract: The present invention relates to a process for controlling the distribution of liquid metal flows of in a crystallizer for the continuous casting of thin slabs. In particular, the process applies to a crystallizer comprising perimetral walls which define a containment volume for a liquid metal bath insertable through a discharger placed in the middle of the bath. The process includes arranging a plurality of electromagnetic brakes, each for generating a braking zone within said bath, and activating these electro-magnetic brakes either independently or in groups according to characteristic parameters of the fluid-dynamic conditions of the liquid metal within the bath.
    Type: Application
    Filed: August 4, 2011
    Publication date: May 30, 2013
    Applicant: DANIELI & C. OFFICINE MECCANICHE S.P.A.
    Inventors: Fabio Guastini, Andrea Codutti, Michele Minen, Fabio Vecchiet
  • Patent number: 8397793
    Abstract: A steel continuous casting method using a continuous caster that includes a pair of upper magnetic poles and a pair of lower magnetic poles is disclosed. The method comprises braking a molten steel flow with DC magnetic fields respectively applied to a pair of upper magnetic poles and a pair of lower magnetic poles while stirring the molten steel with an AC magnetic field simultaneously applied to the pair of upper magnetic poles, the strength of an AC magnetic field applied to the upper magnetic poles and strengths of DC magnetic fields applied to the upper magnetic poles and the lower magnetic poles are controlled within a particular ranges in accordance with the width of a slab to be cast.
    Type: Grant
    Filed: March 9, 2010
    Date of Patent: March 19, 2013
    Assignee: JFE Steel Corporation
    Inventors: Yuji Miki, Yasuo Kishimoto, Shunichi Kawanami
  • Patent number: 8376028
    Abstract: A steel continuous casting method using a continuous caster that includes a pair of upper magnetic poles and a pair of lower magnetic poles is disclosed. The method comprises braking a molten steel flow with the DC magnetic fields respectively applied to the pair of upper magnetic poles and the pair of lower magnetic poles while stirring a molten steel with an AC magnetic field simultaneously applied to the pair of upper magnetic poles, the strength of an AC magnetic field applied to the upper magnetic poles is set within the range of 0.060 to 0.090 T and the strengths of DC magnetic fields applied to the upper and lower magnetic poles are controlled within particular ranges in accordance with the width of the slab to be cast and the casting speed.
    Type: Grant
    Filed: March 9, 2010
    Date of Patent: February 19, 2013
    Assignee: JFE Steel Corporation
    Inventors: Yuji Miki, Yasuo Kishimoto
  • Patent number: 8047265
    Abstract: The present invention provides a previously unattainable compact and high thrust electromagnetic stirrer coil, that is, an electromagnetic stirrer coil for stirring molten steel in a mold by electromagnetic force, in which electromagnetic stirrer coil a space factor of the yoke sectional area (?) with respect to an inside area in a vertical cross-section of said electromagnetic stirrer coil is 0.5 to 0.9 and a yoke width B is 100 mm to 300 mm. Preferably, a magnetomotive force F of said electromagnetic stirrer coil divided by the yoke width B, that is, a value of F/B, is 800 kAT/m or more.
    Type: Grant
    Filed: May 5, 2011
    Date of Patent: November 1, 2011
    Assignee: Nippon Steel Corporation
    Inventors: Hiroshi Harada, Akinori Wakagi, Tomohiro Konno, Keisuke Fujisaki, Ryu Hirayama, Sumio Matsumori, Yasuji Tomizawa
  • Patent number: 7984749
    Abstract: The invention relates to a continuous casting mold, in particular a thin slab mold in which the flow of a liquid metal in the mold is influenced by a magnetic field generated by permanent magnets, wherein the permanent magnets have, over the width and/or height thereof, different magnetic strengths or are spaced from each other by different distances for a different field strength, so that to provide for variation of the magnetic field strength, the permanent magnets are differently adjusted in groups for changing a field strength distribution.
    Type: Grant
    Filed: April 22, 2008
    Date of Patent: July 26, 2011
    Assignee: SMS Siemag AG
    Inventors: Hans Streubel, Walter Trakowski, Karls Rittner
  • Patent number: 7975753
    Abstract: Method for controlling a flow of molten steel in a mould by applying at least one magnetic field to the molten steel in a continuous slab casting machine. Controlling a molten steel flow velocity on a molten steel bath surface to a predetermined molten steel flow velocity by applying a static magnetic field to impart a stabilizing and braking force to a discharge flow from an immersion nozzle when the molten steel flow velocity on the meniscus is higher than a mould powder entrainment critical flow velocity. Controlling the molten steel flow velocity on the meniscus to a range of from an inclusion adherence critical flow velocity or more to a mould powder entrainment critical flow velocity or less by applying a shifting magnetic field to increase the molten steel flow when the molten steel flow velocity on the meniscus is lower than the inclusion-adherence critical flow velocity.
    Type: Grant
    Filed: January 6, 2009
    Date of Patent: July 12, 2011
    Assignee: ABB AB
    Inventors: Anders Lehman, Helmut Hackl, Jan-Erik Eriksson, Olof Sjoden
  • Publication number: 20110162817
    Abstract: To bring about a direct effect on the fluid streams exiting the mould dip tube (2) of moulds in continuous casting moulds (1) of a continuous casting plant for casting liquid metals, in particular liquid steel materials for producing slab and thin slab products with format widths of 750 to 3500 mm and format thicknesses of 30 to 500 mm, said casting plant being equipped with an electromagnetic braking device for improving the product quality, it is proposed to dispose at least two poles (10) per mould broad side (3) symmetrically with respect to the perpendicular reference line (4) of the mould dip tube (2) such that the primary axes (12) of the poles' outlet cross section (11a) are aligned at a specific angle (?1 and ?2) relative to the perpendicular reference line (4) of the mould dip tube (2).
    Type: Application
    Filed: July 15, 2009
    Publication date: July 7, 2011
    Applicant: SMS SIEMAG AKTIENGESELLSCHAFT
    Inventors: Norbert Vogl, Jörn Hoffmeister, Axel Weyer
  • Patent number: 7762311
    Abstract: A method for controlling a flow of molten steel in a slab continuous casting machine including controlling a molten steel flow velocity on a molten steel bath surface to a predetermined flow velocity by applying a shifting magnetic field; controlling the molten steel flow velocity on the molten steel bath surface from an inclusion-adherence critical flow velocity or more to a mold-powder entrainment critical flow velocity or less by applying a shifting magnetic field; and controlling the molten steel flow velocity on the molten steel bath surface from the inclusion-adherence critical flow velocity or more to the mold-powder entrainment critical flow velocity or less by applying a shifting magnetic field.
    Type: Grant
    Filed: March 16, 2009
    Date of Patent: July 27, 2010
    Assignee: JFE Steel Corporation
    Inventors: Jun Kubota, Seishl Mizuoka, Tsuneo Kondo
  • Patent number: 7628196
    Abstract: During continuous casting of metals, a non-moving, vibrating magnetic field is applied to a molten metal in a casting mold to impose only vibration on the molten metal. This continuous casting method can produce a cast slab much less susceptible to flux entrainment, capture of bubbles and non-metal inclusions near the surface of the molten metal, and surface segregation. The magnetic field is preferably produced by arranging electromagnets in an opposing relation on both sides of the mold to lie side by side in the direction of longitudinal width of the mold, and supplying a single-phase AC current to each coil. The single-phase AC current preferably has frequency of 0.10 to 60 Hz. A static magnetic field can be applied intermittently in the direction of thickness of a cast slab. This technique can produce a cast slab substantially free from the flux entrainment and the surface segregation. Preferably, the static magnetic field is intermittently applied under setting of an on-time t1=0.
    Type: Grant
    Filed: January 30, 2004
    Date of Patent: December 8, 2009
    Assignee: JFE Steel Corporation
    Inventors: Hiroshi Yamane, Nagayasu Bessho, Yuji Miki, Shuji Takeuchi, Tadasu Kirihara
  • Publication number: 20090236069
    Abstract: A method for controlling a flow of molten steel in a slab continuous casting machine including controlling a molten steel flow velocity on a molten steel bath surface to a predetermined flow velocity by applying a shifting magnetic field; controlling the molten steel flow velocity on the molten steel bath surface from an inclusion-adherence critical flow velocity or more to a mold-powder entrainment critical flow velocity or less by applying a shifting magnetic field; and controlling the molten steel flow velocity on the molten steel bath surface from the inclusion-adherence critical flow velocity or more to the mold-powder entrainment critical flow velocity or less by applying a shifting magnetic field.
    Type: Application
    Filed: March 16, 2009
    Publication date: September 24, 2009
    Applicant: JFE STEEL CORPORATION
    Inventors: Jun Kubota, Seishi Mizuoka, Tsuneo Kondo
  • Patent number: 7540317
    Abstract: When a molten steel flow velocity (u) on a bath surface is higher than a mold-powder entrainment critical flow velocity of 0.32 m/sec, the molten steel flow velocity (u) is controlled to a predetermined molten steel flow velocity by applying a shifting magnetic field to impart a braking force to a discharge flow from an immersion nozzle. When the molten steel flow velocity (u) is lower than an inclusion-adherence critical flow velocity of 0.20 m/sec and is higher than or equal to a bath-surface skinning critical flow velocity of 0.10 m/sec, the molten steel flow velocity (u) is controlled to the range of 0.20-0.32 m/sec by applying a shifting magnetic field to rotate the intra-mold molten steel in a horizontal direction. When the molten steel flow velocity (u) is lower than the inclusion-adherence critical flow velocity, the molten steel flow velocity (u) is controlled to the range of 0.20-0.
    Type: Grant
    Filed: February 28, 2003
    Date of Patent: June 2, 2009
    Assignee: JFE Steel Corporation
    Inventors: Jun Kubota, Seishi Mizuoka, Tsuneo Kondo
  • Publication number: 20090120604
    Abstract: A method for controlling a flow of molten steel in a mould by applying at least one magnetic field to the molten steel in a continuous slab casting machine. This is achieved by comprising controlling a molten steel flow velocity on a molten steel bath surface, meniscus, to a predetermined molten steel flow velocity by applying a static magnetic field to impart a stabilizing and braking force to a discharge flow from an immersion nozzle when the molten steel flow velocity on the meniscus is higher than a mould powder entrainment critical flow velocity and by controlling the molten steel flow velocity on the meniscus to a range of from an inclusion adherence critical flow velocity or more to a mould powder entrainment critical flow velocity or less by applying a shifting magnetic field to increase the molten steel flow when the molten steel flow velocity on the meniscus is lower than the inclusion-adherence critical flow velocity.
    Type: Application
    Filed: January 6, 2009
    Publication date: May 14, 2009
    Inventors: Anders Lehman, Helmut Hackl, Jan-Erik Eriksson, Olof Sjoden
  • Publication number: 20080179038
    Abstract: An apparatus for continuous casting of magnesium billets or slabs using an electromagnetic field, and a method thereof compensates small solidification latent heat of magnesium, controls a solidification speed, and stirs molten metal within a mold via an electromagnetic field, thereby enabling continuous casting. The apparatus comprises a mold for continuous casting 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. During casting, electric current having a frequency of 2˜1,000 D or electric current of 50˜10,000 A having a frequency of 200˜200,000 D is applied to the coil. A magnesium billet or slab having enhanced inner quality can be produced at a high casting speed without surface defects by applying a low frequency or high frequency electromagnetic field to the mold during continuous casting of magnesium.
    Type: Application
    Filed: December 22, 2005
    Publication date: July 31, 2008
    Inventors: Joon-Pyo Park, Myoung-gyun Kim, Gyu-Chang Lee, U-Sok Yoon
  • Patent number: 7350559
    Abstract: Thus, as shown by an exact electrodynamic computation of EMBF and the estimations described above of the velocity of turbulent flows arising due to their effect, application of amplitude- and frequency-modulated helically traveling (rotating and axially traveling) electromagnetic fields in metallurgical and chemical technologies and foundry can considerably increase the hydraulic efficiency of MHD facilities, intensify the processes of heat and mass transfer in technological plants, significantly increase their productivity, considerably decrease energy consumption for the production of metals, alloys, cast articles, and chemical products, and improve their quality.
    Type: Grant
    Filed: December 16, 2003
    Date of Patent: April 1, 2008
    Assignee: Energetics Technologies, LLC
    Inventors: Irving I Dardik, Arkady K Kapusta, Boris M Mikhailovich, Ephim G Golbraikh, Shaul L Lesin, Herman D Branover
  • Patent number: 7320356
    Abstract: A device for braking a flow of molten metal (5) in a device for continuous or semi-continuous casting of metals in a mould (2) which is provided with opposite broad sides (4) and opposite short sides (3), said device comprising at least one magnet core (1), said at least one core facing one of the short sides (3) of the mould (2) for the purpose of generating a magnetic field (B) and an induced current (i) in a region of the molten metal (5) adjacent the short side (3). The core (1) is arranged in such a way that the magnet field (B) which is generated in said region generally has a direction perpendicular from the short side (3) of the mould (2) towards the centre of the latter.
    Type: Grant
    Filed: January 10, 2002
    Date of Patent: January 22, 2008
    Assignee: ABB AB
    Inventor: Anders Lehman
  • Patent number: 7032646
    Abstract: The present invention: provides a mold for continuous casting that makes it possible to prevent insulation from deteriorating when continuous casting is carried out with electromagnetic force applied to and produce castings of good quality for a long period of time; and is a mold for continuous casting, said mold for continuous casting being equipped with a magnet coil that imposes electromagnetic force on molten metal in the direction perpendicular to the inner wall of said mold in the vicinity of the meniscus of said molten metal in said mold for continuous casting, a pair of the first sets each of which is formed by combining a first cooling copper plate with a first back plate, and another pair of the second sets each of which is formed by combining a second cooling copper plate with a second back plate, and being configured so that a pair of said first sets each of which is composed of a first cooling copper plate and a first back plate are movably interposed between a pair of said second sets each of wh
    Type: Grant
    Filed: March 3, 2004
    Date of Patent: April 25, 2006
    Assignee: Nippon Steel Corporation
    Inventors: Norimasa Yamasaki, Masahiro Tani, Keiji Tsunenari
  • Patent number: 7000677
    Abstract: The invention relates to an electromagnetic braking device for the steel melt running within the continuous casting ingot in a continuous casting unit. The electromagnetic brake device comprises at least one coil (3) with a ferromagnetic core (5), arranged on the broad side of the ingot and at least one yoke (7) provided on the above. In order to reduce the oscillating masses on the ingot components and to permit the retro-fitting of electromagnetic brakes to conventional continuous casting machines, the electromagnetic brake, comprising yoke (7), coil (3) and ferromagnetic core (5), is embodied such as to pivot inwards or outwards, preferably by means of two unequal length, non-parallel levers in or on the continuous casting ingot, using an actuator (6).
    Type: Grant
    Filed: September 7, 2002
    Date of Patent: February 21, 2006
    Assignee: SMS Demag Aktiengesellschaft
    Inventor: Klaus-Peter Eberwein
  • Patent number: 6938674
    Abstract: An apparatus for continuous casting of metals has members (16) adapted to generate a stationary magnetic field of a variable strength over substantially the entire horizontal cross section of the mould from one long side to the other long side close to, or below, the region for supply of molten metal at a distance below the upper surface of the molten metal. There are also members (17) adapted to generate a variable magnetic field in the area of the upper surface in a region that is centrally located with respect to said cross section and close to a region for supply of molten metal. A unit (12) is adapted to control said magnetic members (16, 17) to generate, independently of each other, magnetic fields with an appearance that is dependent on the value prevailing of one or more predetermined casting parameters.
    Type: Grant
    Filed: September 27, 2002
    Date of Patent: September 6, 2005
    Assignee: ABB AB
    Inventor: Jan-Erik Eriksson
  • Patent number: 6929055
    Abstract: The apparatus comprises a submerged entry nozzle (6) having outlets in the main casting plane (P) which differ in their direction of output and fall within two categories (7, 8). The nozzle is associated with two inductors (14, 15) opposite each other on each broad face (22) of the casting mold forming a gap which surrounds the nozzle and produces a traversing magnetic field covering the outlets of at least one category (7). Elements are provided for adjusting the intensity of the field or for moving it so as to be able to change the distribution between the outlets of the total flow of molten metal. Implementing the invention makes it possible to adjust at any time that fraction of the metal flow which is directed toward the free surface (9) with respect to that, main, fraction directed toward the bottom of the mold.
    Type: Grant
    Filed: September 30, 2003
    Date of Patent: August 16, 2005
    Assignee: Rotelec
    Inventors: Siebo Kunstreich, Marie-Claude Nove
  • Patent number: 6923245
    Abstract: The invention concerns a method for producing a metal strip, whereby molten is continuously poured between two casting rolls (1, 2) of a strip casting machine with rolls. Above the molten bath (4) and respectively proximate to the molten bath (5) casting rolls (1, 2) transition surface a rotating magnetic field is produced which generates, in the molten metal, local turbulent flows, so that a surface current is formed in said molten metal, which surface current is directed by the casting rolls (1, 2) towards the central plane (E) of the molten bath (4), that is towards the plane for output of the metal strip (8), thereby enabling to largely prevent supernatant impurities at the surface of the molten bath and oxides located on the surface of the rolls from being deposited, and the molten metal particles from being prematurely solidified.
    Type: Grant
    Filed: September 13, 2002
    Date of Patent: August 2, 2005
    Assignees: SMS Demag Aktiengesellschaft, Main Management Inspiration AG
    Inventors: Heinrich Marti, Jacques Barbe, Dominique Salathe, Alfred Koch
  • Publication number: 20040244942
    Abstract: The invention relates to an electromagnetic braking device for the steel melt running within the continuous casting ingot in a continuous casting unit. The electromagnetic brake device comprises at least one coil (3) with a ferromagnetic core (5), arranged on the broad side of the ingot and at least one yoke (7) provided on the above. In order to reduce the oscillating masses on the ingot components and to permit the retro-fitting of electromagnetic brakes to conventional continuous casting machines, the electromagnetic brake, comprising yoke (7), coil (3) and ferromagnetic core (5), is embodied such as to pivot inwards or outwards, preferably by means of two unequal length, non-parallel levers in or on the continuous casting ingot, using an actuator (6).
    Type: Application
    Filed: March 22, 2004
    Publication date: December 9, 2004
    Inventor: Klaus-Peter Eberwein
  • Publication number: 20040182539
    Abstract: During continuous casting of metals, a non-moving, vibrating magnetic field is applied to a molten metal in a casting mold to impose only vibration on the molten metal. This continuous casting method can produce a cast slab much less susceptible to flux entrainment, capture of bubbles and non-metal inclusions near the surface of the molten metal, and surface segregation. The magnetic field is preferably produced by arranging electromagnets in an opposing relation on both sides of the mold to lie side by side in the direction of longitudinal width of the mold, and supplying a single-phase AC current to each coil. The single-phase AC current preferably has frequency of 0.10 to 60 Hz. A static magnetic field can be applied intermittently in the direction of thickness of a cast slab. This technique can produce a cast slab substantially free from the flux entrainment and the surface segregation. Preferably, the static magnetic field is intermittently applied under setting of an on-time t1 0.
    Type: Application
    Filed: January 30, 2004
    Publication date: September 23, 2004
    Applicant: JFE STEEL CORPORATION
    Inventors: Hiroshi Yamane, Nagayasu Bessho, Yuji Miki, Shuji Takeuchi, Tadasu Kirihara
  • Publication number: 20040112567
    Abstract: The apparatus comprises a submerged entry nozzle (6) having outlets in the main casting plane (P) which differ in their direction of output and fall within two categories (7, 8). The nozzle is associated with two inductors (14, 15) opposite each other on each broad face (22) of the casting mold forming a gap which surrounds the nozzle and produces a traversing magnetic field covering the outlets of at least one category (7). Elements are provided for adjusting the intensity of the field or for moving it so as to be able to change the distribution between the outlets of the total flow of molten metal. Implementing the invention makes it possible to adjust at any time that fraction of the metal flow which is directed toward the free surface (9) with respect to that, main, fraction directed toward the bottom of the mold.
    Type: Application
    Filed: September 30, 2003
    Publication date: June 17, 2004
    Inventors: Siebo Kunstreich, Marie-Claude Nove
  • Patent number: 6619377
    Abstract: The invention concerns a method which consists in: simultaneously subjecting the meniscus of the molten metal present in the ingot mould to the action of an axial alternating electromagnetic field tending to provide it with a general dome-like shape and to the action of a transverse direct electromagnetic field designed to attenuate the surface agitation of the meniscus. The implementing installation comprises an ingot mould (1) with cooled assembled plates (2, 3 and 4, 5) for casting metal slabs, an alternating current coil (17) enclosing the ingot mould at the meniscus (12) of the molten metal to produce an axial magnetic field, collinear with the casting axis (11), and a direct magnetic field winding passing through the large plates of the ingot mould at the meniscus (12) perpendicular to the casting axis.
    Type: Grant
    Filed: August 13, 2002
    Date of Patent: September 16, 2003
    Assignee: The Japan Research and Development Center for Metals
    Inventors: Jacqueline Etay, Marcel Garnier, Yves Delannoy, Jean-Marie Galpin, Jean-Yves Lamant, Pascal Gardin
  • Patent number: 6557623
    Abstract: Molten steel is poured using an immersion nozzle and a direct current magnetic field zone is applied to a cast slab over the entire width in the thickness direction thereof at a predetermined distance below the molten metal level in a continuously-casting mold. The immersion nozzle is provided with ejection holes located in at least upper and lower stages, at least one lower ejection hole is disposed such that these satisfy the following formula (1). The supply rate of molten steel from the upper ejection holes is set smaller than the rate consumed by solidification in an upper pool, and a particular solute element is added to the molten steel in the upper pool. 0<h<(½)·w·tan &thgr;  (1) where, &thgr;: downward angle of lower ejection hole(s) (°); w: length of mold in width direction (m); and h: distance from center of lower ejection hole to center of height of magnetic pole (m).
    Type: Grant
    Filed: November 9, 2001
    Date of Patent: May 6, 2003
    Assignee: Kawasaki Steel Corporation
    Inventors: Hiromitu Shibata, Yasuo Kishimoto, Shuji Takeuchi, Koji Yamaguchi
  • Patent number: 6530418
    Abstract: Method and apparatus for continuous casting, especially casting of steel that can easily provide high quality steel that has no central segregation and central porosity.
    Type: Grant
    Filed: October 17, 2001
    Date of Patent: March 11, 2003
    Assignee: EBIS Corporation
    Inventors: Yoshio Ebisu, Kazuyoshi Sekine
  • Patent number: 6513575
    Abstract: A method and a device for continuous casting of metals, in which the device comprises a mould (1), through which a liquid metal passes, and a member (4), through which a liquid metal is supplied as a jet to the mould (1). The device comprises magnet members (6, 7) for applying a magnetic field varying with time and being substantially fixed in the room to the liquid metal in the mould (1).
    Type: Grant
    Filed: June 1, 2001
    Date of Patent: February 4, 2003
    Assignee: ABB AB
    Inventors: Conny Svahn, Tord Kroon, Jan-Erik Eriksson, Göte Tallbäck
  • Patent number: 6502627
    Abstract: An apparatus for providing a magnetic field in a casting mold to slow and redirect in a controllable fashion the flow of liquid steel exiting from a submerged entry nozzle into the casting mold uses selectable removable ferromagnetic and non-magnetic laminar elements stackable on the ends of core fingers in the vicinity of the poles of an electromagnetic yoke positioned adjacent the mold face. By selecting the type and location of the stackable elements on the ends of the fingers, one can modify the properties of the magnetic field permeating the interior of the mold. Optionally, independent field coils may be provided for energizing selected portions of the magnetic field core structure to provide further magnetic field control without having to remove and replace laminar elements.
    Type: Grant
    Filed: September 17, 2001
    Date of Patent: January 7, 2003
    Assignee: Ipsco Enterprises Inc.
    Inventors: William R. Frank, Jonathan Dorricott
  • Patent number: 6494249
    Abstract: A method and a device for continuous or semi-continuous casting of metal. A primary flow (P) of hot metallic melt supplied into a mold is acted upon by at least one static or periodically low-frequency magnetic field to brake and split the primary flow and form a controlled secondary flow pattern in the non-solidified parts of the cast strand. The magnetic flux density of the magnetic field is controlled based on casting conditions. The secondary flow (M, U, C1, C2, c3, c4, G1, G2, g3, g4, O1, O2, o3, o4) in the mold is monitored throughout the casting and upon detection of a change in the flow, information on the detected change monitored flow is fed into a control unit (44) where the change is evaluated and the magnetic flux density is regulated based on this evaluation to maintain or adjust the controlled secondary flow.
    Type: Grant
    Filed: May 4, 2000
    Date of Patent: December 17, 2002
    Assignee: ABB AB
    Inventors: Sten Kollberg, Carl Petersohn, Göte Tallbäck, Jan-Erik Eriksson, Magnus Hällefält
  • Patent number: 6460606
    Abstract: Continuous casting machine for the continuous casting of molten steel into a cast product, comprising a mold in which the molten steel is poured through an exit port of a nozzle, forming a bath of molten metal, and in which at least part of the metal is solidified, whereby the continuous casting machine is provided with control means for controlling the flow of molten steel and operative on the molten steel after entering the mold such that the flow pattern of the molten steel in the mold is basically symmetrical with respect to at least one plane of symmetry of the mold.
    Type: Grant
    Filed: July 12, 1999
    Date of Patent: October 8, 2002
    Assignee: Corus Staal BV
    Inventors: Marcus Cornelis Maria Cornelissen, Ferdinand Hendrik Frinking, JongKeun Kim, SangJoon Kim
  • Patent number: 6453985
    Abstract: A method of continuously casting molten metal has the step of feeding molten metal into a mold to produce a casting continuously while generating an electromagnetic field in the mold by applying a high frequency to the mold. The application of the high frequency is controlled in such a manner that a magnitude of an electromagnetic field which is applied to a solidification shell forming start location of the mold becomes equal to or greater than a minimum required flux density to be applied to the mold. The minimum required flux density is determined according to the following equation: B min = 1130 × t n - 5 ⁢ f × ( t n - 0.
    Type: Grant
    Filed: December 15, 2000
    Date of Patent: September 24, 2002
    Assignee: Kabushiki Kaisha Kobe Seiko Sho
    Inventors: Hitoshi Nakata, Takeshi Inoue, Hideo Mori
  • Patent number: 6450241
    Abstract: A method and a device for continuous or semi-continuous casting of metal, where hot melt is supplied to a cooled continuous casting mold and the melt is cooled and formed to a at least partly solidified strand as it passes through the mold. An inductive coil is arranged at the top end of the mold to, when supplied with an alternating electric high frequency current, generate a high frequency magnetic field to act upon the melt in the mold, whereby heat is developed in the melt and compressive forces acting to separate the melt from the mold wall are generated. The coil is supplied with the high frequency current from a power supply unit with a current control to supply an alternating electric high frequency current having a base frequency of 50 Hz or more to the inductive coil. The current control has modulation means for modulating and controlling the supplied current is controlled in a pulsed, amplitude modulated manner with an amplitude modulated modulation frequency of 10 Hz.
    Type: Grant
    Filed: August 31, 2000
    Date of Patent: September 17, 2002
    Assignee: ABB AB
    Inventor: Anders Lehman
  • Patent number: 6443219
    Abstract: The present invention provides a continuous casting method in which vibration is given to molten metal by a shifting magnetic field so that the equi-axed crystal ratio can be enhanced and the equi-axed crystals can be made fine without generating surface defects caused by powder trapping. Further, the present invention provides an apparatus to which the continuous casting method is applied. Furthermore the present invention provides a cast slab produced by the above method and apparatus.
    Type: Grant
    Filed: August 9, 1999
    Date of Patent: September 3, 2002
    Assignee: Nippon Steel Corporation
    Inventors: Katsuhiro Sasai, Eiichi Takeuchi, Hiroshi Harada, Hajime Hasegawa, Takehiko Toh, Keisuke Fujisaki
  • Publication number: 20020117290
    Abstract: Method and apparatus for continuous casting, especially casting of steel that can easily provide high quality steel that has no central segregation and central porosity.
    Type: Application
    Filed: March 26, 2001
    Publication date: August 29, 2002
    Applicant: EBIS Corporation
    Inventors: Yoshio Ebisu, Kazuyoshi Sekine
  • Publication number: 20020079083
    Abstract: The method for controlling flow pattern of molten steel in continuous casting, comprises the steps of: (a) continuously casting a molten steel injected through an immersion nozzle; (b) measuring temperatures of a copper plate on longer side of the mold in width direction thereof at plurality of points; (c) detecting a flow pattern of the molten steel in the mold based on the time-sequential variations of temperatures of the copper plate at individual measurement points; and (d) controlling the flow pattern to establish a specified pattern on the basis of the detected result. The temperatures of mold copper plate are measured by plurality of temperature measurement elements buried in the rear face of the mold copper plate for continuous casting. The temperature measurement elements are arranged in a range of from 10 to 135 mm distant from the melt surface in the mold in the slab-drawing direction.
    Type: Application
    Filed: August 31, 2001
    Publication date: June 27, 2002
    Inventors: Makoto Suzuki, Massayuki Nakada, Jun Kubota, Noriko Kubo, Junichi Monda, Yuichi Yamaoak, Yoshimitsu Isobe
  • Publication number: 20020074103
    Abstract: An apparatus for providing a magnetic field in a casting mold to slow and redirect in a controllable fashion the flow of liquid steel exiting from a submerged entry nozzle into the casting mold uses selectable removable ferromagnetic and non-magnetic laminar elements stackable on the ends of core fingers in the vicinity of the poles of an electromagnetic yoke positioned adjacent the mold face. By selecting the type and location of the stackable elements on the ends of the fingers, one can modify the properties of the magnetic field permeating the interior of the mold. Optionally, independent field coils may be provided for energizing selected portions of the magnetic field core structure to provide further magnetic field control without having to remove and replace laminar elements.
    Type: Application
    Filed: September 17, 2001
    Publication date: June 20, 2002
    Applicant: Ipsco Enterprises Inc.
    Inventors: William R. Frank, Jonathan Dorricott
  • Patent number: 6341642
    Abstract: An apparatus for providing a magnetic field in a casting mold to slow and redirect in a controllable fashion the flow of liquid steel exiting from a submerged entry nozzle into the casting mold uses selectable removable ferromagnetic and non-magnetic laminar elements stackable on the ends of core fingers in the vicinity of the poles of an electromagnetic yoke positioned adjacent the mold face. By selecting the type and location of the stackable elements on the ends of the fingers, one can modify the properties of the magnetic field permeating the interior of the mold. Optionally, independent field coils may be provided for energizing selected portions of the magnetic field core structure to provide further magnetic field control without having to remove and replace laminar elements.
    Type: Grant
    Filed: September 24, 1999
    Date of Patent: January 29, 2002
    Assignee: IPSCO Enterprises Inc.
    Inventors: William R. Frank, Jonathan Dorricott
  • Publication number: 20020005267
    Abstract: In a magnetic brake apparatus for a continuous casting mold having a pair of first and second upper electromagnets 17A and 17B which are oppositely placed near the rear faces of the opposing side walls of the continuous casting mold 10, and a pair of first and second lower electromagnets 21A and 21B which are oppositely placed thereunder, a static magnetic field being generated between each pair of electromagnets to stem the stream of the molten steel supplied to the casting mold by the static magnetic field, the apparatus has controlling units which independently control a current supplied to magnetic coils 16A and 16B being constituents of the first and second upper electromagnets and a current supplied to magnetic coils 20A and 20B being constituents of the first and second lower electromagnets.
    Type: Application
    Filed: January 28, 1999
    Publication date: January 17, 2002
    Inventors: SUSUMU YUHARA, SHIGENOBU TAKATA, HISASHI OSANAI
  • Patent number: 6332493
    Abstract: A chill mold for the simultaneous casting of two parallel strands and a magnetic brake which generates at least one static or periodic low frequency magnetic field. The chill mold includes a rectangular casting mold and an inner partition which subdivides the rectangular casting mold into two sub-molds, and the magnetic field acts with essentially the same magnetic field direction across the entire width of the rectangular casting mold and has an essentially symmetrical distribution in both sub-molds. The brake includes a first magnet at a first long side of the rectangular casting mold and a second magnet of opposite polarity at the opposite second long side of the rectangular casting mold. The magnetic material in the first and second magnets is distributed such that both magnets have two magnetic sub-poles of the same polarity arranged adjacent to each other along each of the two long-sides of the rectangular casting mold.
    Type: Grant
    Filed: October 18, 1999
    Date of Patent: December 25, 2001
    Assignee: ABB AB
    Inventors: Magnus Hallefält, Conny Svahn, Erik Svensson
  • Publication number: 20010050159
    Abstract: Continuous casting machine for the continuous casting of molten steel into a cast product, comprising a mold in which the molten steel is poured through an exit port of a nozzle, forming a bath of molten metal, and in which at least part of the metal is solidified, whereby the continuous casting machine is provided with control means for controlling the flow of molten steel and operative on the molten steel after entering the mold such that the flow pattern of the molten steel in the mold is basically symmetrical with respect to at least one plane of symmetry of the mold.
    Type: Application
    Filed: July 12, 1999
    Publication date: December 13, 2001
    Inventors: MARCUS CORNELIS MARIA CORNELISSEN, FERDINAND FRINKING, JONGKEUN KIM, SANGJOON KIM
  • Patent number: 6321829
    Abstract: A billet continuous casting machine comprises, and a billet continuous casting method uses, a jacket for cooling an outer wall of a quadrangular tubular mold with cooling water, electromagnetic brakes disposed outside the mold for decelerating the flow speed of poured molten metal in the mold, an X ray-based level sensor for detecting the level of molten metal in the mold, notched portions formed at the corners of a quadrangular lower part of the mold, spray nozzles for spraying a cooling liquid directly onto the notched portions, and elastically pushing means for imparting a pushing force corresponding to the static pressure of the molten metal to unnotched portions of the quadrangular lower part of the mold to push the unnotched portions inwardly of the mold, whereby molten metal is continuously poured into the cooled mold to solidify the molten metal so that a cast piece quadrangular in cross section is continuously produced.
    Type: Grant
    Filed: December 23, 1999
    Date of Patent: November 27, 2001
    Assignee: Mitsubishi Heavy Industries, Ltd.
    Inventors: Hironori Fujioka, Hiroshi Nakajima, Masahiro Kassai
  • Patent number: 6315029
    Abstract: A continuous casting method, and a device for use in the casting method, are disclosed. The flow state of the discharged molten metal is properly controlled, and thus, the amounts of residual non-metallic inclusions and gas bubbles within the molten metal are decreased, so that continuously cast slabs of a good quality can be produced. The continuous casting device includes a mould with a submerged nozzle installed therein, the submerged nozzle having a pair of discharge holes directed toward narrow faces of the mould. Further, an electromagnetic brake ruler is included for establishing a magnetic field within the mould. The electromagnetic brake ruler includes a base frame surrounding the mould, and iron cores projecting from near the wide faces of the mould, while the iron cores are wound with induction coils.
    Type: Grant
    Filed: March 31, 2000
    Date of Patent: November 13, 2001
    Assignees: Pohang Iron & Steel Co., Ltd., Research Institute of Industrial Science & Technology
    Inventors: Myung Jong Cho, Sang Joon Kim, Jong Keun Kim, In Cheol Kim