Patents by Inventor Sten Kollberg
Sten Kollberg has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20120199308Abstract: A method for casting of metal. A mold is provided including two broad sides and two narrow sides. A molten metal is introduced into the mold. There is a meniscus at a top of the molten metal. Additional molten metal is supplied into the molten metal via a casting tube below the meniscus. At least one stirrer including an iron core and a coil applied around the iron core is arranged around the mold. A length of the iron core in relation to a length of the broad side of the mold is between 50% and 80% of the length of the broad side. An upper part of the iron core is positioned from 50 mm above to 195 mm below the surface of the meniscus. A magnetic field is applied to the molten metal with the at least one stirrer to stir the molten metal.Type: ApplicationFiled: February 22, 2012Publication date: August 9, 2012Applicant: ABB ABInventors: Sten KOLLBERG, Jan-Erik Eriksson
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Patent number: 7669638Abstract: A control system for regulating the flow of liquid metal in a device for casting a metal. A detector measures a process variable. A control unit evaluates data from the detector. At least one process parameter is automatically varied in order to optimize casting conditions. The detector measures a characteristic of the meniscus at at least two points on the meniscus instantaneously throughout the casting process.Type: GrantFiled: November 28, 2003Date of Patent: March 2, 2010Assignee: ABB ABInventors: Sten Kollberg, Jan-Erik Eriksson, Carl-Fredrik Lindberg, Mats Molander, Peter Löfgren, Göte Tallbäck, Rebei Bel Fdhila, Bertil Samuelsson, Stefan Israelsson Tampe, Christina Wallin
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Publication number: 20090255642Abstract: A device for casting of metal. The device includes a mold, a casting tube via which molten metal is supplied to molten metal in the mold in a region at a distance below a meniscus of the molten metal, and at least one stirrer including an iron core and a coil arranged around the iron core. The iron core is arranged to be elongated along the broad side of the mold and adapted to apply a magnetic field to the molten metal for stirring the melted metal. An upper part of the iron core is positioned at a distance from the meniscus of from 50 mm above the surface of the meniscus to 195 mm below the surface. The length of the iron core in relation to the length of the broad side of the mold is between at least 50% and 80% of the length of the broad side.Type: ApplicationFiled: April 25, 2007Publication date: October 15, 2009Applicant: ABB ABInventors: Sten Kollberg, Jan-Erik Eriksson
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Publication number: 20060162895Abstract: A control system for regulating the flow of liquid metal in a device for casting a metal. A detector measures a process variable. A control unit evaluates data from the detector. At least one process parameter is automatically varied in order to optimize casting conditions. The detector measures a characteristic of the meniscus at at least two points on the meniscus instantaneously throughout the casting process.Type: ApplicationFiled: November 28, 2003Publication date: July 27, 2006Applicant: ABB ABInventors: Sten Kollberg, Jan-Erik Eriksson, Carl-Fredrik Lindberg, Mats Molander, Peter Lofgren, Gote Tallback, Rebei Bel Fdhila, Bertil Samuelsson, Stefan Israelsson Tampe, Christina Wallin
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Patent number: 6494249Abstract: 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: GrantFiled: May 4, 2000Date of Patent: December 17, 2002Assignee: ABB ABInventors: Sten Kollberg, Carl Petersohn, Göte Tallbäck, Jan-Erik Eriksson, Magnus Hällefält
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Patent number: 5740855Abstract: A device for slowing down the non-solidified portions of a cast strand during continuous casting of billets or blooms. The device comprises a group of at least three separate molds (1-4) which are open in the direction of casting and which are arranged such that each one is supplied with a flow of melt. The device also comprises a number of magnetic core parts (5-8), and at least one magnetic-field generating member (9-13), adapted to generate and transfer, together with the magnetic core parts, a static magnetic field or a periodic low-frequency magnetic field to the inflowing melt in such a way that the movement of the melt is slowed down. The magnetic core parts and the magnetic-field generating members are arranged such that, together with all the molds in the group, they form a common closed magnetic circuit. All the molds included in the group are arranged in series with each other in the closed magnetic circuit.Type: GrantFiled: March 17, 1997Date of Patent: April 21, 1998Assignee: ASEA Brown Boveri ABInventors: Jan Erik Eriksson, Magnus Hallefalt, Sten Kollberg, Anders Lehman
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Patent number: 5664619Abstract: A device for continuously manufacturing a cast strand by continuous casting of liquid metal melt wherein the flow of the liquid metal in the non-solidified portions of the strand is controlled by means of a static or periodic low-frequency magnetic field. A mould adapted to be supplied with the melt includes copper plates (2a,2b) which form a casting mould space with a rectangular cross section, water box beams (3) which are arranged outside the copper plates to support and cool them, and a member (4) holding the mould together. Magnetic field-generating devices, i.e., magnets, are provided close to the mould to generate a static or periodic low-frequency magnetic field which acts in the path of the inflowing melt and divides the primary flow as well as checks any secondary flows arising. Each magnet comprises a front core (5), a rear core and a coil (7).Type: GrantFiled: June 19, 1995Date of Patent: September 9, 1997Assignee: Asea Brown Boveri ABInventors: Erland Andersson, Jan-Erik Eriksson, Magnus Hallefalt, Sten Kollberg, Erik Svensson, Gote Tallback
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Patent number: 5404933Abstract: A method and a device for controlling the flow of the molten metal in non-solidified portions of a cast strand in connection with casting of metal. A mould (11) is supplied with at least one primary flow (20) of molten metal and at least one strand (1) is formed in the mould. At least one static or periodic low-frequency magnetic field (10) is applied to act with a maximum magnetic field strength in the mould exceeding 1000 Gauss in the path of the inflowing molten metal to brake and divide the primary flow (20) of molten metal flowing into the mould and to control any secondary flows (21, 22) arising.Type: GrantFiled: July 9, 1993Date of Patent: April 11, 1995Assignee: Asea Brown Boveri ABInventors: Erland Andersson, Jan-Erik Eriksson, Sten Kollberg, Gote Tallback
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Patent number: 4735256Abstract: Apparatus for heating intermediate ladles or tundishes, for example, in continuous casting processes. The apparatus comprises at least one coil having an iron core, which is disposed adjacent the ladle or tundish. The ladle or tundish and the coils are arranged so as to be movable with respect to each other. The ladle or tundish is adapted to be placed in a heating position adjacent to the coil, which is thus closely connected with the bottom or lower parts or corners of the ladle or tundish, in order primarily to heat the lowermost parts of the melt stored in the tundish.Type: GrantFiled: February 12, 1986Date of Patent: April 5, 1988Assignee: ASEA ABInventors: Sten Kollberg, Yngve Sundberg
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Patent number: 4651800Abstract: A level meter in a mold for continuous casting has an assembly including a continuous casting mold, an annular multi-phase electromagnetic stirrer surrounding the mold, and a source of radioactivity projecting a beam of radiation through the mold, a detector for the beam being positioned on the opposite side of the mold. To permit the stirrer to have a height providing optimum stirring, two of the coils of the stirrer have portions of reduced height forming spaces opposite to each other and through which the beam can be projecting to the detector. Therefore, the height of the stirrer need not be reduced to provide for the beam and detector arrangement.Type: GrantFiled: February 19, 1985Date of Patent: March 24, 1987Assignee: Asea ABInventor: Sten Kollberg
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Patent number: 4648440Abstract: A continuous casting apparatus has a plurality of non-magnetic rollers which contact a side of a continuously cast traveling strand. To support each roller against bending, the roller is journaled at its opposite ends and also at least at one interposed position between its ends to define roller lengths between each two of the bearings. Inductive stirrers providing traveling magnetic flux fields extending for the full extent of each length in each instance, are positioned on the outside of such roller length so as to project flux fields without interruption through the roller between its journaled ends and the interposed journaling position. Uniform uninterrupted fields are provided regardless of the strand's width.Type: GrantFiled: August 24, 1982Date of Patent: March 10, 1987Assignee: Asea ABInventors: Conny Andersson, Sten Kollberg
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Patent number: 4594723Abstract: A method for continuously pouring molten metal in an initially substantially unfilled tundish having a channel-type inductor having a channel opening into the bottom portion of the tundish, is done by starting the pourings and the continuous sequential steps of applying power to the inductor when its channel is first covered by the poured metal to form a melt level and the static pressure of the metal is low and while increasing the power rapidly so as to cause incipient pinching in the channel and then momentarily rapidly reducing the power so as to prevent pinching; as the metal level further increases so that the metal's static pressure further increases, again increasing the power rapidly so as to again cause incipient pinching in the channel and then again momentarily rapidly reducing the power so as to prevent pinching; and continuing these sequential steps until the tundish is filled.Type: GrantFiled: March 5, 1984Date of Patent: June 10, 1986Assignee: ASEA ABInventors: Kare Folgero, Sten Kollberg
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Patent number: 4570698Abstract: The mold is rotated during casting while projecting at least one traveling magnetic stirring field tangentially into the melt so as to rotate melt to the mold speed.Type: GrantFiled: September 17, 1984Date of Patent: February 18, 1986Assignee: ASEA AktiebolagInventor: Sten Kollberg
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Patent number: 4562881Abstract: A method for stirring the unsolidified metal in the cast strand in continuous casting uses an asymmetrical multiphase stirring current with asymmetry caused by the phase angle of one phase of the current deviating from the phase angle of another phase of the current. In addition to the asymmetrical stirring, symmetrical stirring can be used at a location adjacent to the asymmetrical stirring so that the benefits of both types of stirring are obtained.Type: GrantFiled: October 18, 1982Date of Patent: January 7, 1986Assignee: ASEA AktiebolagInventor: Sten Kollberg
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Patent number: 4541472Abstract: A system for stirring in continuous casting is formed by an inductive stirrer which inductively stirs molten metal in a continuously cast strand and at least one set of two water-cooling pipes positioned in front of the stirrer and having nozzles which eject water cooling-sprays against the strand. The two pipes have ends extending beyond the field and between their ends are electrically isolated from each other and the stirrer. By electrically interconnecting these ends outside of the field, the two pipes form a closed electric loop in which currents induced by the stirrers field cancel so that the net current flow is zero and the stirrer's field is not shielded from the strand.Type: GrantFiled: September 7, 1983Date of Patent: September 17, 1985Assignee: ASEA AktiebolagInventors: Jan Erik Eriksson, Mats Karlsson, Sten Kollberg, Bengt Mansson
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Patent number: 4495984Abstract: During continuous casting, the stream of molten metal poured into the mold is acted on by a static magnetic field so as to split the stream into smaller streams stirring the unsolidified metal in the mold.Type: GrantFiled: August 30, 1983Date of Patent: January 29, 1985Assignee: ASEA AktiebolagInventor: Sten Kollberg
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Patent number: 4183395Abstract: A multi-phase stirrer for stirring the molten cores of cast slabs from continuous casting machines is divided into at least two partial stirrers with each partial stirrer comprising at least one phase winding and fed with a number of phases at least one less than the total number of phases of the stirrer apparatus. Each partial stirrer may be arranged at different sides of the cast slab to form a rotary field around the cast slab in association with the other partial stirrers. Additional iron cores may be arranged in the air gaps formed between the iron cores of the respective partial stirrers. Alternatively, the additional iron cores may be arranged within the support tubes of the casting apparatus.Type: GrantFiled: January 31, 1978Date of Patent: January 15, 1980Assignee: Asea AktiebolagInventor: Sten Kollberg
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Patent number: 4173299Abstract: A valve device for metallurgical containers includes an electric circuit formed by two electrodes opening out into the molten metal at the tapping point. The electric circuit measures the resistive voltage drop across the molten metal at the tapping point to determine the slag content in the tap stream by changes in the measured resistive voltage drop. The rate of tapping of the melt can be controlled simultaneously along with the indication of the presence of slag in the tap stream.Type: GrantFiled: October 25, 1977Date of Patent: November 6, 1979Assignee: ASEA ABInventors: Sten Kollberg, Lars Tiberg
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Patent number: 4100364Abstract: A DC electric arc furnace melt connection of the type formed by a metal connector with an inner end melted by the melt and an outer end kept solid by cooling, extends from the furnace hearth at a declination straight and free from curvature and with a uniform and constant cross-sectional area from end to end having a rectangular oblong cross sectional shape with the long sides extending in a horizontal direction. The purpose is to reduce the flow currents normally formed by gas bubbles and electrodynamic effects within the melted portion of the connector and which cause the melted part to wipe over the unmelted part of the connector with the undesirable result of promoting heat exchange between the two parts.Type: GrantFiled: April 26, 1977Date of Patent: July 11, 1978Assignee: ASEA AktiebolagInventor: Sten Kollberg