EP0011861A1 - Dispositif et procédé pour le brassage électromagnétique de la partie liquide du métal dans une installation de coulée continue d'acier - Google Patents

Dispositif et procédé pour le brassage électromagnétique de la partie liquide du métal dans une installation de coulée continue d'acier Download PDF

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Publication number
EP0011861A1
EP0011861A1 EP79104751A EP79104751A EP0011861A1 EP 0011861 A1 EP0011861 A1 EP 0011861A1 EP 79104751 A EP79104751 A EP 79104751A EP 79104751 A EP79104751 A EP 79104751A EP 0011861 A1 EP0011861 A1 EP 0011861A1
Authority
EP
European Patent Office
Prior art keywords
stirrer
strand
support
guide elements
support guide
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.)
Ceased
Application number
EP79104751A
Other languages
German (de)
English (en)
Inventor
Markus Schmid
Armin Thalmann
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.)
SMS Concast AG
Original Assignee
Concast Holding AG
Concast AG
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
Application filed by Concast Holding AG, Concast AG filed Critical Concast Holding AG
Publication of EP0011861A1 publication Critical patent/EP0011861A1/fr
Ceased legal-status Critical Current

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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
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/122—Accessories for subsequent treating or working cast stock in situ using magnetic fields

Definitions

  • the invention relates to a device for electromagnetic stirring of the sump in a steel strand in a continuous casting installation, a support guide and at least one stirrer being arranged along the strand guideway, which generates turbulent flows in the sump by means of electromagnetic traveling fields, and a method using the device.
  • a stirring system in which a stirrer is arranged on each side of the strand.
  • the stirrer is arranged between two large guide rollers and their support elements and extends close to the surface of the strand.
  • small support rollers are provided close to each agitator side, which are supported on the support members of the large rollers.
  • These small support rollers are arranged over the strand width.
  • the small Distance between stirrer and strand surface probably requires less power and thus smaller stirrers.
  • the S tützabstand for the strand between these small supporting roles but can not be prevented due to the through-reaching between them stirrer still too large, so that harmful bulges of the strand.
  • guide rollers are arranged along a support guideway as guide elements, a stirrer being provided outside the support guideway.
  • the guide rollers made of non-magnetic material have large roller diameters with large support spacings for large slab widths and can result in harmful bulges of slab strands.
  • the rollers arranged between the stirrer and the strand surface result in a correspondingly large air gap between the stirrer and the strand surface and the resulting loss of performance.
  • the stirrer In order to achieve an effective stirring effect in the strand, the stirrer must be appropriately adjusted in terms of size and performance.
  • this literature does not provide a solution to the question of how, when casting slabs with large width differences in the strand, a format-adapted, optimal stirring effect with corresponding quality improvement can be achieved.
  • the invention has for its object to eliminate the disadvantages mentioned and to create a strand guide frame with electromagnetic stirring device for a continuous caster, which can cast slabs of good quality with large width differences in an economical manner. Furthermore, the invention is intended to enable optimum stirring action in the strand by means of procedural measures in order to improve the strand quality.
  • this object is achieved in that support columns are arranged between the support guide elements, which are at least three-fold across the width, and a crossbeam carrying the support guide elements, and at least part of the stirrer is fastened outside the support guide between the support guide elements and the crossbeam and between the support columns of the support guide elements.
  • the device according to the invention allows the construction of a support guide frame with an electromagnetic stirring device for continuous casting plants with high economy both in terms of plant costs and in terms of operating costs.
  • the use of several supports across the width of the support guide allows a correspondingly small dimensioning of the thickness of the guide elements or of the roller diameter.
  • the stirrer With the arrangement of the stirrer between the guide elements and the traverse, i.e. the support for the guide elements, the stirrer can be installed at a short distance from the surface of the strand. This allows the installation of less powerful and therefore smaller stirrers, which is cheaper on the one hand and saves energy costs on the other.
  • the support guide designed in accordance with the invention enables small roller spacings, as a result of which harmful bulges and cracks in the strand crust and breakthroughs, even with large slab widths, can be avoided.
  • the arrangement of a plurality of stirrers or stirrer elements over the broad side of the support guide by means of corresponding switching devices allows the individual moving fields to be started up or one of the two possible moving field directions to be optionally selected, and thus enables the turner fields to be optimally adapted to brammers of different widths.
  • Plate-shaped or grid-shaped support guides and support rollers can be used. Depending on the position of the stirrer relative to the bathroom mirror, the support guides mentioned can be used more or less advantageously.
  • the invention recommends a support guide designed as a sliding guide, such as a plate or grid.
  • An advantageous embodiment of the invention results if the support guide is divided into segments or sections and the stirrer can be replaced together with the segment.
  • Such segments can be removed or installed, for example, with known segment changing devices, or exchanged upwards with a hoist, which results in short downtimes for the system in the event of malfunctions.
  • stirrer parts are arranged so that a turbulent flow is generated in the line transverse to the longitudinal direction of the line.
  • rotatably arranged stirrers are also conceivable in order to be able to introduce traveling fields in any direction into the swamp of the strand.
  • An optimal combination between the number and size of the roller bearings per roller, an advantageous roller diameter Hiking fields and the individual hiking field strengths can be reached if four-way mounted rollers are provided and two stirrers are arranged between the support columns of the central roller section and one stirrer between the support columns of the two roller base sections.
  • a separate traverse can be provided for each roll that is divided several times. For reasons of cost, it is often advantageous if the crossbeam supports the support columns of several rollers, for example one segment.
  • the invention also enables significant procedural advantages using the device. For example, it is possible for the stirrers acting on a strand to produce rectified thrust forces. This mode of operation ensures good mixing of the steel and advantageous temperature compensation between the sump in the area below the stirrer and the bath level area.
  • the stirrers generate turbulent flows which are directed on one side of the central axis of a broad side of the strand guide in the strand pull-out direction and on the other side of the central axis counter to the strand pull-out direction. This makes it possible to quickly create a closed flow circuit with relatively little thrust. This ermö g- light a good utilization of the existing traveling wave power.
  • An additional advantageous adaptation to different casting parameters is achieved if at least one stirrer is generated by adjacent stirrers by different electrical loading or by different design of the coils in the strand, different thrust forces acting on the melt and the turbulent flows being mutually influenced.
  • the phases can be applied differently in at least one stirrer. If, for example, only one stirrer is arranged transversely to the longitudinal direction of the strand, the invention recommends a different electrical application of the phases of a stirrer in order to generate differently acting thrust forces within the traveling field.
  • a continuous mold follows a vertical Plant, a from support guide elements 8, which are fastened in interchangeable segments 9.
  • the support guide can also have a curved shape.
  • Spründüsen 4 indicate the secondary cooling device.
  • the segments 9 have support guide elements in the form of rollers 6, which guide a strand 8 and support the ferrostatic pressure of the sump 7 waving on the strand shell.
  • a stirrer 5 for electromagnetic stirring of the sump 7 is arranged in the semi-rigid strand.
  • the rollers 6 made of non-magnetic material, for example stainless steel, are attached.
  • the segment 9 of the support guide is equipped on one side of the strand track with support guide elements in the form of multiply divided rolls 10 and on the other strand track with continuous rolls 11.
  • the rollers 11 can also be divided.
  • the rollers 10, which are mounted four times over the width of the segment 9, are supported on a crossmember 14 via support guide bearings 12 and support columns 13, 13 'designed as roller bearings.
  • This cross member 14 is the actual support for the rollers 10 and between them and the support 14 and between the support columns 13, 13 'four stirrers 15 are arranged.
  • the stirrer 15 can either be a multi-phase stirrer or only part of such a stirrer.
  • the segment parts of the two guideways are clamped together against stops 18 by hydraulic cylinders 17.
  • Such strand guide segments provided with at least one pair of rollers can easily be removed from the strand guide and used again in sheet-fed systems by means of known segment changing devices.
  • Such a segment can also have a plurality of pairs of rollers, the same with the help of a Wa the strand guide is extended or retracted.
  • the stirrers 15 generate turbulent flows in the slab 20 in the longitudinal direction of the strand, all four stirrers 15 being put into operation for a large slab 20 and only the two middle stirrers 15 being put into operation for a smaller slab 20 'shown in broken lines.
  • the four-way mounted roller 10 allows the arrangement of two stirrers between the support columns 13 'of the roller middle part and one stirrer 15 each between the support columns 13', 13 of the two roller end parts.
  • the traverse 14 can support the support columns 13, 13 'of several rollers.
  • the distance and the shear force of adjacent stirrers can be selected so that the turbulent flows of each stirrer influence each other if the neighboring stirrers have shear forces of the same magnitude.
  • the segment 9 is formed with guide elements 22 in the form of a support and cooling plate.
  • This elite guide element 22 is mounted in triplicate across the width of the segment 9, support columns 23 being provided between the slide guide 22 and a cross member 24.
  • Both stirrers 25 can produce traveling fields with different directions. On one side of the central axis 26 of the broad side of the segment 9, for example, a turbulent flow in the strand 28 can be generated in the strand pull-out direction and on the other side of the central axis 26 against the strand pull-out direction.
  • the two stirrers 25 can also generate shear forces in the same direction.
  • FIG. 4 shows a segment 9 similar to FIG. 2.
  • the support guide elements are designed as five rollers 30 supported on a crossbar 32 by means of support columns 31 det.
  • the four stirrer parts shown at 34 generate a turbulent flow transverse to the longitudinal direction of the strand.
  • the stirrer parts 34 can act as at least two-phase stirrers or as single-phase stirrer parts together with adjacent stirrer elements as a stirring device. All four stirrer parts are in operation for the wide slab 20 and only the two middle stirrer parts for the small slab 20 '.
  • FIG. 5 shows a further example of a segment 9 with a support guide element 40 in the form of a cooling grille.
  • the cooling grids are provided with conventional spray cooling devices 41.
  • the cooling grille is supported on a crossbar 44 via support columns 43.
  • Stirrer parts 45, 45 ' arranged between the cooling grid 40 and crossmember 44 and between the support columns 43, produce a traveling field transverse to the longitudinal direction of the strand.
  • the direction of the traveling field is represented by arrows 46, the arrow length representing a measure of different thrust force within the traveling field. This different thrust can be generated by different electrical loading of the phases.
  • the middle stirrer 45 ' can consist of a two-phase stirrer and the stirrers 45 can each consist of a single-phase stirrer element, the stirrer 45' and the two stirrer elements 45 interacting as a stirrer in the case of wide slabs.
  • the three stirrer parts 45, 45 ' are at least two-phase.
  • a different electrical loading of stirrers adjacent in the longitudinal direction of the strand can also be provided. Different thrust forces acting on the melt are generated, with the resulting turbulent flows still influence each other.
  • a different version of the coils can optionally be provided. Another possible variation is that the phases are acted on differently in at least one of two adjacent stirrers.
  • the stirrers 5, 15, 25, 34 and 45 shown in the figures can optionally be switched on and off by appropriate switching devices.
  • one of the two possible hiking field directions can optionally be switched.
  • the size of the pushing force can also be set for each stirrer.
  • support beams instead of the support columns 13, 23, 31, 43, support beams also extend which extend in the direction of the strand over a plurality of roller bearings.
  • the cross members 9 shown in the examples can be arranged at greater intervals and can be designed as cross beams. Such an arrangement ensures access to the stirrer.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Mixers With Rotating Receptacles And Mixers With Vibration Mechanisms (AREA)
EP79104751A 1978-12-01 1979-11-29 Dispositif et procédé pour le brassage électromagnétique de la partie liquide du métal dans une installation de coulée continue d'acier Ceased EP0011861A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH1228978A CH633464A5 (de) 1978-12-01 1978-12-01 Strangfuehrungsbahn mit elektromagnetischer ruehreinrichtung in einer stahlstranggiessanlage.
CH12289/78 1978-12-01

Publications (1)

Publication Number Publication Date
EP0011861A1 true EP0011861A1 (fr) 1980-06-11

Family

ID=4381628

Family Applications (1)

Application Number Title Priority Date Filing Date
EP79104751A Ceased EP0011861A1 (fr) 1978-12-01 1979-11-29 Dispositif et procédé pour le brassage électromagnétique de la partie liquide du métal dans une installation de coulée continue d'acier

Country Status (9)

Country Link
EP (1) EP0011861A1 (fr)
JP (1) JPS5577963A (fr)
AU (1) AU524877B2 (fr)
CA (1) CA1143130A (fr)
CH (1) CH633464A5 (fr)
DE (1) DE2947869A1 (fr)
ES (1) ES486843A1 (fr)
SE (1) SE431171B (fr)
ZA (1) ZA796525B (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0165316A1 (fr) * 1982-06-08 1985-12-27 Kawasaki Steel Corporation Dispositif agitateur electromagnetique pour machine de coulee en continu
WO2018041794A1 (fr) * 2016-08-31 2018-03-08 Primetals Technologies Austria GmbH Dispositif de bobines d'agitation dans une installation de coulée continue
CN116352039A (zh) * 2023-06-01 2023-06-30 江苏省沙钢钢铁研究院有限公司 桥梁钢用连铸坯的中心质量控制方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1962341B2 (de) * 1969-12-12 1971-06-24 Aeg Elotherm Gmbh Anordnung einer mehrphasigen elektromagnetischen wicklung am strangfuehrungsgeruest einer stranggiessanlage
DE2401145A1 (de) * 1973-04-18 1974-10-31 Nippon Steel Corp Verfahren und vorrichtung zum kontinuierlichen giessen
DE2559511A1 (de) * 1974-06-24 1977-02-10 Nippon Steel Corp Stranggiessanlage mit elektromagnetischer ruehrvorrichtung
DE2720391A1 (de) * 1976-05-21 1977-12-01 Asea Ab Anordnung beim stranggiessen
DE2743505A1 (de) * 1977-09-23 1979-03-29 Aeg Elotherm Gmbh Einrichtung zur erzeugung eines elektromagnetischen drehfeldes innerhalb der stuetzrollenbahn einer stranggiessanlage

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1962341B2 (de) * 1969-12-12 1971-06-24 Aeg Elotherm Gmbh Anordnung einer mehrphasigen elektromagnetischen wicklung am strangfuehrungsgeruest einer stranggiessanlage
DE2401145A1 (de) * 1973-04-18 1974-10-31 Nippon Steel Corp Verfahren und vorrichtung zum kontinuierlichen giessen
DE2559511A1 (de) * 1974-06-24 1977-02-10 Nippon Steel Corp Stranggiessanlage mit elektromagnetischer ruehrvorrichtung
DE2720391A1 (de) * 1976-05-21 1977-12-01 Asea Ab Anordnung beim stranggiessen
DE2743505A1 (de) * 1977-09-23 1979-03-29 Aeg Elotherm Gmbh Einrichtung zur erzeugung eines elektromagnetischen drehfeldes innerhalb der stuetzrollenbahn einer stranggiessanlage

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
E. HERRMANN "Handbuch des Stranggiessens" 1958, ALUMINIUM VERLAG, Dusseldorf, * Seiten 417 bis 428 * *

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0165316A1 (fr) * 1982-06-08 1985-12-27 Kawasaki Steel Corporation Dispositif agitateur electromagnetique pour machine de coulee en continu
EP0165316A4 (fr) * 1982-06-08 1986-02-20 Kawasaki Steel Co Dispositif agitateur electromagnetique pour machine de coulee en continu.
US4706735A (en) * 1982-06-08 1987-11-17 Kawasaki Steel Corporation Continuous caster including an electromagnetic stirring apparatus
WO2018041794A1 (fr) * 2016-08-31 2018-03-08 Primetals Technologies Austria GmbH Dispositif de bobines d'agitation dans une installation de coulée continue
AT519029A1 (de) * 2016-08-31 2018-03-15 Primetals Technologies Austria GmbH Rührspulenanordnung in einer Stranggießanlage
AT519029B1 (de) * 2016-08-31 2019-10-15 Primetals Technologies Austria GmbH Rührspulenanordnung in einer Stranggießanlage
CN116352039A (zh) * 2023-06-01 2023-06-30 江苏省沙钢钢铁研究院有限公司 桥梁钢用连铸坯的中心质量控制方法
CN116352039B (zh) * 2023-06-01 2023-08-22 江苏省沙钢钢铁研究院有限公司 桥梁钢用连铸坯的中心质量控制方法

Also Published As

Publication number Publication date
SE7909880L (sv) 1980-06-02
AU524877B2 (en) 1982-10-07
DE2947869A1 (de) 1980-06-04
SE431171B (sv) 1984-01-23
CA1143130A (fr) 1983-03-22
JPS5577963A (en) 1980-06-12
CH633464A5 (de) 1982-12-15
AU5325879A (en) 1980-06-05
ES486843A1 (es) 1980-05-16
ZA796525B (en) 1980-11-26

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