EP0155575B1 - Verfahren zur Regelung des Durchflusses einer elektrisch leitenden Flüssigkeit, insbesondere einer Metallschmelze beim Stranggiessen, und eine Vorrichtung zur Durchführung des Verfahrens - Google Patents

Verfahren zur Regelung des Durchflusses einer elektrisch leitenden Flüssigkeit, insbesondere einer Metallschmelze beim Stranggiessen, und eine Vorrichtung zur Durchführung des Verfahrens Download PDF

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Publication number
EP0155575B1
EP0155575B1 EP85102328A EP85102328A EP0155575B1 EP 0155575 B1 EP0155575 B1 EP 0155575B1 EP 85102328 A EP85102328 A EP 85102328A EP 85102328 A EP85102328 A EP 85102328A EP 0155575 B1 EP0155575 B1 EP 0155575B1
Authority
EP
European Patent Office
Prior art keywords
flow
metal
coil
insert body
pouring spout
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.)
Expired
Application number
EP85102328A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0155575A1 (de
Inventor
Eduard Mueller
Hans Gloor
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.)
Concast Standard AG
Original Assignee
Concast Standard 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 Standard AG filed Critical Concast Standard AG
Priority to AT85102328T priority Critical patent/ATE32500T1/de
Publication of EP0155575A1 publication Critical patent/EP0155575A1/de
Application granted granted Critical
Publication of EP0155575B1 publication Critical patent/EP0155575B1/de
Expired 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
    • B22D39/00—Equipment for supplying molten metal in rations
    • B22D39/003—Equipment for supplying molten metal in rations using electromagnetic field
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/14—Closures
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/0318—Processes
    • Y10T137/0391—Affecting flow by the addition of material or energy
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/206—Flow affected by fluid contact, energy field or coanda effect [e.g., pure fluid device or system]
    • Y10T137/2082—Utilizing particular fluid
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/206—Flow affected by fluid contact, energy field or coanda effect [e.g., pure fluid device or system]
    • Y10T137/218—Means to regulate or vary operation of device
    • Y10T137/2191—By non-fluid energy field affecting input [e.g., transducer]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/206—Flow affected by fluid contact, energy field or coanda effect [e.g., pure fluid device or system]
    • Y10T137/218—Means to regulate or vary operation of device
    • Y10T137/2191—By non-fluid energy field affecting input [e.g., transducer]
    • Y10T137/2196—Acoustical or thermal energy
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/4456—With liquid valves or liquid trap seals
    • Y10T137/4643—Liquid valves
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/6416—With heating or cooling of the system

Definitions

  • the invention relates to a method for regulating the flow of an electrically conductive liquid, in particular a molten metal during continuous casting, and a device for carrying out the method.
  • the active length of the coil is understood to mean approximately the length of the coil in the coil axis.
  • the metal located in the pouring tube flow channel in the direction of flow in front of the effective length of the coil is cooled and solidified. Removal of the solidified metal plug can be effected by switching on the coil raised to the height of the metal plug or a second coil arranged at this height. This can e.g. in the case of multi-strand systems, a targeted re-pouring takes place after an interruption for individual strands.
  • the refractory insert body which fills the center at least with its upper part, ensures that the metal flows on the outside of the insert body, as a result of which the electromagnetic influence by the coil takes place in an area close to the inductor, in which the field strength required for regulation takes place with lower energy requirements can be generated. This creates a better possibility of regulation or the possibility of stopping the flow of metal.
  • the insert body preferably forms an annular space with the pouring tube, the length of which influences the control characteristic in the electromagnetic effective range of the coil.
  • the diameter of the insert body filling the center of the pouring tube is advantageous to choose according to the electrical conductivity of the poured metal melt and / or the frequency of the coil current.
  • a particularly good control option is obtained if the diameter of the insert body is greater than three times the depth of penetration 8 of the electromagnetic field into the molten metal. Under this depth of penetration is the penetration, as described for example in DE-OS 1 803 473.
  • the flow channel of the pouring tube preferably has a shoulder-shaped widening in the direction of flow of the metal to a space to the end face of which the insert body is fastened at a distance.
  • the metal flow is displaced into an external gap or annulus.
  • the metal can be constricted well in the space in front of the gap, so that if the displacement is large enough, no metal will flow through the annular space, delimited by the outer surface of the insert body and the pouring tube.
  • the insert part preferably has bores or flow channels in its upper part, in which the metal can flow from the annular space into a central flow channel of the insert body and flows downwards therein.
  • This allows the metal, e.g. the steel can be introduced centrally into a subsequent vessel, which is particularly advantageous for smaller strand formats.
  • the insert body can be adjustable in height in the pouring tube, for example by means of a screw thread provided in the enlarged bore of the pouring tube.
  • the distance between the upper part of the insert piece and the end face of the enlarged bore can be changed. i.e. By changing the space formed by the inner surface of the pouring tube and the top surface of the insert used, this flow space can be adapted to the particular circumstances.
  • a thermally and electrically well-conducting ring can be arranged in front of the upper part of the insert body and concentrically around the flow channel, which can be acted upon by coolant via a supply line. As described below in the exemplary embodiment, this provides a particularly advantageous possibility of stopping and shutting off the metal flow.
  • the electromagnetic coil can be height-adjustable in the axial direction along the pouring tube, advantageously up to the height of the built-in ring.
  • a heat sink can be applied to the upper part of the insert body, which has the task of solidifying the metal that first flowed into the pouring tube during casting.
  • This body is inserted into the bore of the pouring tube before the pouring tube and insert body are assembled, but can also already be integrated in the insert, e.g. consist of a cooling metal attached by means of a dovetail guide.
  • the metal flow can be directed upwards in a flow direction before entering an annular space. opposed to gravity.
  • at least one flow opening can be arranged in the refractory insert body such that the metal melt flows through this flow opening before entering the annular space and can be fed to the annular space from below and that bores for the outflow from the annular space above a boundary edge on the Metal entry side of the annulus are arranged.
  • splashes caused by induced turbulence in the annular space fall back into a lower deflection channel. This means that you cannot exit the pouring pipe.
  • an insert body 2 is fixed in a pouring tube 1, which opens into a continuous casting mold 3 for producing a steel strand 18.
  • the pouring tube 1 is located below a pouring vessel, not shown, e.g. an intermediate container from which the steel flows into the flow channel 5 of the pouring tube 1.
  • This has a step-like or shoulder-shaped widening of the flow channel, in the flow direction of the steel, to a space 21, to the end face 7 of which there is an upper part 9 of the insert body 2 at a distance 10.
  • This upper part 9 has a smaller diameter than the enlarged flow-through bore 14 of the pouring tube 1 and fills the center of this bore to form an annular space 11 between the pouring tube wall and the part 9 of the insert body 2.
  • a screw thread 20 allows the distance 10 to be changed, so that a specific flow cross section can be set directly above the part 9 for the space 21.
  • An electromagnetic coil 25 is arranged concentrically around the pouring tube in such a way that the center of the coil lies approximately in the height range of the space 21.
  • the steel flowing through the pouring tube duct 5 from above is guided radially outward through the upper surface of the part 9 and then flows downward along the annular space 11. This prevents metal flow in the effective area of the coil, which corresponds approximately to the coil length, and in the center of the coil and the pouring tube channel.
  • the upper part of the insert body has, for example, four bores 16 ; through which the steel is fed to an axial and central flow channel 17, from which it can flow into the liquid core of the strand 18 formed in the mold 3.
  • the coil length 26 can be dimensioned according to the desired effect. In the case of a longer coil, which extends for example over the length of the annular space 11, the proportion of the eddy current braking effect is greater, and the flow rate can be regulated more precisely.
  • the mode of action is more restricted to a concentrated constriction of the steel with respect to the edge 28.
  • the electromagnetic coil 25 can be adjustable in height along the pouring tube, as indicated by the double arrow 27.
  • the steel flowing through can be braked or stopped by the constriction being reinforced to such an extent that the meniscus is displaced inwards over the edge 28 of the upper part 9, as shown in FIG. 1.
  • This enables the flow rate to be regulated easily and reliably from 0% to 100%, without mechanically moving parts and without mechanical wear and tear of any components.
  • Unwanted freezing of the steel in the device can be excluded by the inductive heating in the effective range of the coil, which is arranged only a short distance around the pouring tube.
  • the diameter of the flow channel 5 is approximately 40 mm
  • the outer and inner diameter of the annular space 11 is approximately 65 mm or 60 mm
  • that of the four bores 16 is approximately 15 mm
  • the axial bore 17 in the insert body 2 has a diameter of approximately 25 mm.
  • coolant e.g. Air or inert gas
  • the flow is briefly prevented electromagnetically and then the heat-conducting ring 30 is cooled until the metal has solidified in this area. The coil 25 is then switched off.
  • the coil can be axially displaced up to the height of the ring 30, so that there is also the possibility of inductively melting and continuing to pour an interrupted metal flow.
  • a second coil can also be provided, which is attached stationary at the height of the ring 30.
  • FIG. 2 shows a further embodiment in which the insert body 2 has been inserted into the pouring tube 1 from above. If necessary, this body 2 can be fastened in the pouring tube by means of a refractory cement. In this embodiment, the bores 16 are at the same height.
  • the operation of the coil 25 is illustrated in the right half of the figure. When the coil is charged with a sufficiently high current, the material is constricted radially up to the width of the upper part 9 of the insert body 2 and thus prevented from flowing further through the space formed between the inner tube wall and the upper part 9.
  • a heat sink 35 in the form of a disk, which was placed on the insert body 2 before the casting, is indicated by dashed lines.
  • the inductive heating effect of the coil 25 allows the metal solidified in the area of the heat sink 35 to be melted in a targeted manner over time.
  • the heat sink 35 can also already be integrated in the insert and e.g. be attached to it via a dovetail-like guide.
  • the pouring tube shown in Fig. 2 plunges into the bath level of a mold, not shown. It is clear that a short, non-immersing pouring tube can also be used instead.
  • the electromagnetic forces influencing the flow rate can be controlled via the current strength flowing in the coil 25. It is also possible to change the electromagnetic force on the melt at a predetermined current strength by moving the coil along its axis, or generally by changing the geometric position of the coil with respect to the edge 28 or the space 21, or by changing the current flow in the coil through electrical or mechanical current displacement. A combination of the above measures is also conceivable.
  • the coils 25 are arranged around the pouring tube 1.
  • the distance of the coil 25 from the annular space 11 is thus influenced by the wall thickness of the pouring tube 1.
  • the annular space 11 can also be formed directly by the coil 25 and by a displacement body with the edge 28.
  • the coil 25 can be coated with a thin layer of ceramic material and can represent, for example, a pouring tube extension. With such an arrangement, the efficiency is significantly improved.
  • the displacement body can be provided with a stopper-shaped attachment above the edge 28, which forms a stopper closure with an appropriately designed pouring tube.
  • the displacer is used together with an axially movable one Moving the pouring tube part in the direction of the fixed pouring tube part, the plug-shaped attachment can close the fixed pouring tube.
  • a stopper closure which acts from bottom to top, can, for example, completely interrupt the metal outflow as an emergency closure.
  • a refractory insert body 40 with two flow openings 41 is arranged within a pouring tube 43.
  • An annular space 44 is arranged in the effective range of an electromagnetic coil 45 between the insert body 40 and the pouring tube 43.
  • the flow openings 41 open into a likewise annular deflection channel 46, in which the molten metal is deflected before it enters the annular space 44 and is fed therein from below in the direction of the arrow 47.
  • Bores 49 for the outflow of the molten metal from the annular space 44 are located above a boundary edge 50 which defines the entry cross section of the annular space 44.
  • pouring tube 1, 43, insert body 2, 44 and the coil 25, 45 are advantageously designed to be round. However, it is also possible to choose other cross sections such as oval, polygonal, etc.
  • the method and the device according to the invention can advantageously be used in multi-strand casting plants.
  • several billet or billet strands with the same take-off speed and common system parts such as oscillation, roller guide, scissors etc. can be cast with a small strand spacing.
  • the electrical equipment in multi-strand systems for feeding the coil can include an independent medium-frequency power supply for each individual strand, or a medium-frequency supply for each multi-strand system with parallel connection or series connection or individual coils.
  • the individual control of the individual strands could be carried out by one or a combination of the control options listed above. With the parallel connection, a control for the individual strings would also be e.g. conceivable with upstream chokes with variable inductors.
  • the invention is equally advantageous to use in the case of the so-called “twin casting”, in which two strands have to be cast exactly synchronously.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Continuous Casting (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Flow Control (AREA)
  • Electrically Driven Valve-Operating Means (AREA)
  • Infusion, Injection, And Reservoir Apparatuses (AREA)
  • Control For Baths (AREA)
EP85102328A 1984-03-07 1985-03-01 Verfahren zur Regelung des Durchflusses einer elektrisch leitenden Flüssigkeit, insbesondere einer Metallschmelze beim Stranggiessen, und eine Vorrichtung zur Durchführung des Verfahrens Expired EP0155575B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85102328T ATE32500T1 (de) 1984-03-07 1985-03-01 Verfahren zur regelung des durchflusses einer elektrisch leitenden fluessigkeit, insbesondere einer metallschmelze beim stranggiessen, und eine vorrichtung zur durchfuehrung des verfahrens.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH1132/84 1984-03-07
CH1132/84A CH665369A5 (de) 1984-03-07 1984-03-07 Verfahren zur regelung des durchflusses einer metallschmelze beim stranggiessen, und eine vorrichtung zur durchfuehrung des verfahrens.

Publications (2)

Publication Number Publication Date
EP0155575A1 EP0155575A1 (de) 1985-09-25
EP0155575B1 true EP0155575B1 (de) 1988-02-17

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP85102328A Expired EP0155575B1 (de) 1984-03-07 1985-03-01 Verfahren zur Regelung des Durchflusses einer elektrisch leitenden Flüssigkeit, insbesondere einer Metallschmelze beim Stranggiessen, und eine Vorrichtung zur Durchführung des Verfahrens

Country Status (13)

Country Link
US (1) US4655237A (es)
EP (1) EP0155575B1 (es)
JP (1) JPH0675753B2 (es)
KR (1) KR920002402B1 (es)
AT (1) ATE32500T1 (es)
AU (1) AU577091B2 (es)
BR (1) BR8501008A (es)
CA (1) CA1240821A (es)
CH (1) CH665369A5 (es)
DE (1) DE3561615D1 (es)
ES (1) ES8606681A1 (es)
MX (1) MX157862A (es)
ZA (1) ZA851520B (es)

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KR870000714B1 (ko) * 1981-11-18 1987-04-09 하세가와 겐고오 수평 연속 주조방법
LU84103A1 (fr) * 1982-04-22 1984-03-02 Arbed Systeme de decrassage automatique de busettes pendant la coulee de metaux
JPS6099458A (ja) * 1983-11-07 1985-06-03 Toshiba Corp 溶湯移送量調整装置とその調整方法

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3842690A1 (de) * 1988-12-19 1990-06-21 Didier Werke Ag Feuerfeste verbindung sowie induktionsspule hierfuer
DE3842690C2 (de) * 1988-12-19 1998-04-30 Didier Werke Ag Feuerfeste Verbindung sowie Induktionsspule hierfür
DE4301330A1 (de) * 1993-01-20 1994-08-18 Didier Werke Ag Verfahren zum induktiven Aufheizen eines keramischen Formkörpers
DE102013101962B3 (de) * 2013-02-27 2014-05-22 Schuler Pressen Gmbh Gießvorrichtung und Gießverfahren

Also Published As

Publication number Publication date
JPS6178542A (ja) 1986-04-22
AU3913485A (en) 1985-09-12
CA1240821A (en) 1988-08-23
ES541397A0 (es) 1986-04-16
ZA851520B (en) 1985-10-30
BR8501008A (pt) 1985-10-29
KR850007013A (ko) 1985-10-30
JPH0675753B2 (ja) 1994-09-28
CH665369A5 (de) 1988-05-13
DE3561615D1 (en) 1988-03-24
ES8606681A1 (es) 1986-04-16
AU577091B2 (en) 1988-09-15
US4655237A (en) 1987-04-07
MX157862A (es) 1988-12-16
ATE32500T1 (de) 1988-03-15
EP0155575A1 (de) 1985-09-25
KR920002402B1 (ko) 1992-03-23

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