EP0158628A2 - Procédé pour couler du métal fondu ainsi que dispositif pour la mise en oeuvre de ce procédé - Google Patents

Procédé pour couler du métal fondu ainsi que dispositif pour la mise en oeuvre de ce procédé Download PDF

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Publication number
EP0158628A2
EP0158628A2 EP85890072A EP85890072A EP0158628A2 EP 0158628 A2 EP0158628 A2 EP 0158628A2 EP 85890072 A EP85890072 A EP 85890072A EP 85890072 A EP85890072 A EP 85890072A EP 0158628 A2 EP0158628 A2 EP 0158628A2
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EP
European Patent Office
Prior art keywords
pouring
coils
molten metal
casting
pouring tube
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP85890072A
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German (de)
English (en)
Other versions
EP0158628A3 (fr
Inventor
Aktiengesellschaf Voest-Alpine
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.)
Voestalpine AG
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Voestalpine 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 Voestalpine AG filed Critical Voestalpine AG
Publication of EP0158628A2 publication Critical patent/EP0158628A2/fr
Publication of EP0158628A3 publication Critical patent/EP0158628A3/fr
Withdrawn legal-status Critical Current

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    • 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
    • B22D11/16—Controlling or regulating processes or operations
    • B22D11/18—Controlling or regulating processes or operations for pouring
    • B22D11/181—Controlling or regulating processes or operations for pouring responsive to molten metal level or slag level
    • B22D11/186—Controlling or regulating processes or operations for pouring responsive to molten metal level or slag level by using electric, magnetic, sonic or ultrasonic means

Definitions

  • the invention relates to a method for casting molten metal from a metallurgical vessel, in which the molten metal is covered with a layer of slag, into a further metallurgical vessel, the molten metal being passed between the vessels through a pouring tube covering the pouring jet, and a device for carrying it out of the procedure.
  • AT-B - 364 754, AT-B - 365 497 to prevent the slag from moving along when the molten metal emerges from a metallurgical vessel by the amount of molten metal and / or molten metal in the vessel and the total amount be measured continuously, for example by means of floating bodies floating on the molten metal bath level and by optical observation of the slag level. Furthermore, it is known from AT-B - 364 754 and AT-B - 365 497 to determine the amount of molten metal by means of induction loops provided in the lining of the metallurgical vessel, which, however, is complex.
  • the invention aims to avoid these difficulties and has as its object to provide a method and an apparatus for carrying out the method, with which it is possible to determine reliably the passage of slag through a pouring tube with very little effort, whereby different operating conditions ( Flow rates, flow rates, temperatures, caking of metal on the pouring tube wall, etc.) can be taken into account and direct contact with the molten metal and slag is avoided and conventional metallurgical vessels can be used without modifications.
  • This object is achieved in that magnetic fields are induced in the pouring jet by means of two coils surrounding the pouring tube and the difference in the inductance changes, which are caused in the two coils by the eddy currents caused by the magnetic fields in the pouring jet, is continuously measured and with at least one limit value is compared and that the casting is interrupted when the limit value is exceeded and / or undershot.
  • the pouring nozzle has a turbulent flow, through which flow eddy currents are caused. These eddy currents remain approximately constant with an unchanged flow rate per unit of time, as long as molten metal flows through the pouring tube, so that the difference in the inductance changes at the coils is approximately constant. As soon as slag penetrates the pouring tube and has passed through the first of the coils, the difference in the inductance changes increases; As soon as only pure slag flows through the pouring tube, the difference goes back to zero, since the liquid slag cannot deliver a signal change due to its low electrical conductivity.
  • the casting is interrupted after an increase in the difference in inductance changes over a predetermined limit value within a predetermined time interval and a subsequent drop in the difference in inductance changes under a predetermined limit value within a further predetermined time interval.
  • a device for carrying out the method with a metallurgical vessel, from which a pouring tube is directed into a further metallurgical vessel is characterized in that the pouring tube is peripherally composed of two identical coils arranged one behind the other in the longitudinal direction of the pouring tube, supplied by an AC power source and connected in series is surrounded, the outputs of the coils are integrated in a Wheatstone bridge, the bridge diagonal of which is connected between the coils.
  • a preferred embodiment is characterized in that the Wheatstone bridge is followed by a mean value rectifier and a peak value rectifier, each with a phase shifter, mean value rectifiers and peak value rectifiers being connected in parallel, and in that both the mean value rectifier and the peak value rectifier are each followed by a comparator, each of which two comparators is connected in parallel to the mean value rectifier and the peak value rectifier.
  • FIG. 1 showing a block diagram of a device for carrying out the method.
  • Fig. 2 shows a signal as it occurs at the start of slag running with the metal pouring jet.
  • 3 shows the voltage profiles at the inputs of the comparators.
  • Fig. 1 denotes a ladle which is filled with molten steel 3 covered by a slag layer 2.
  • the steel melt flows in the form of a pouring jet 5 through a bottom opening 4 into an intermediate vessel 6 located below the ladle 1, from which the steel melt 3 flows into a mold, which is not shown in the drawing, however.
  • the pouring jet 5 In order to protect the pouring jet 5 from the effects of atmospheric oxygen, it is surrounded by a pouring tube 7, a so-called shadow tube, which either extends just above the pouring level 8 of the intermediate vessel 6 or is immersed in the molten steel 3 located in the intermediate vessel 6.
  • the shadow pipe 7 In order to determine whether or not slag 2 coexists through the shadow pipe towards the casting end of the pouring of the molten steel 3 from the ladle 1 into the intermediate vessel 6, the shadow pipe 7 is peripherally surrounded by two coils 9, 10, the coils, and this is essential, in Longitudinal direction of the pouring tube arranged one behind the other and connected in series. They are fed by an AC transformer 11, which is supplied with an AC voltage of approximately 5 kHz.
  • the outputs of the coils are in a Wheatstone bridge integrated, the resistances of which are the two coils 9, 10 and two coils 12, 13 of the transformer 11, which are also connected in series.
  • the bridge diagonal 14 of the Wheatstone bridge is connected between the coils 9 and 10 as well as 12 and 13 connected in series.
  • the output signal rectified by the bridge diagonal 14 via a phase rectifier 15 is fed to a high-pass filter 16.
  • This high-pass filter converts the signal to two rectifiers connected in parallel, etc. a mean value rectifier 17 and a peak value rectifier 18, each with a phase shifter and further fed in parallel to a display amplifier 19.
  • the output signal of each rectifier 17, 18 is forwarded to two comparators 20, 21 which are connected in parallel to each of the two rectifiers 17, 18.
  • a signal curve at the start of slag outflow is explained below with reference to FIG. 2.
  • a signal (at 22) resulting from the eddy formation of the pouring jet 5 can be observed at a constant height.
  • the signal (at 23) this is because the balance of the Wheatstone bridge is disturbed by the slag 2 as soon as slag only is present in one of the coils).
  • the signal drops (at 24), since the liquid slag 2 cannot deliver any changes in inductance and therefore no changes in signal due to its low electrical conductivity.
  • the bottom opening 4 of the pan will be closed of the closure member, for example a slide or a plug 25, actuated so that the casting is interrupted. This can be effected, for example, by an electrical coupling between an electric motor 26 that actuates the closure member and the comparators 20, 21.
  • the signal emerging from the phase rectifier 15 is therefore proportional to the difference in the inductance changes of the two coils 9 and 10. freed, so that signals caused by the flow go to further processing.
  • the output of the high-pass filter 16 is monitored by means of the display amplifier 19, etc. as to whether the device is working correctly and whether a signal of the required amount is present at all.
  • the mean value rectifier 17 has a phase shifter with a time constant of 15 s and the peak value rectifier has a phase shifter with a time constant of about 2 s.
  • the mean equals richter forms the mean value of the signal, the exceeding and falling short of which are to be detected.
  • the mean value rectifier outputs an output voltage that corresponds to the amplitude of sinusoidal signals. In practice, however, this is only approximate.
  • the signal is rectified with a peak value rectifier with a time constant of 2 s and multiplied by 2. At the output of the peak value rectifier there is now twice the amplitude of the signal.
  • the output voltage is set between 2U o and U o and between U o and 0 by means of a potentiometer (not shown). These voltages are fed to the two comparators 20 and 21, the second input of which is connected to the mean value output of the mean value rectifier 17.
  • the output voltage of the mean value rectifier 17 has a time constant of 15 s, as described above, i.e. if the voltage at the input of the mean value rectifier 17 changes, it takes 15 s until the output of the mean value rectifier 17 has followed the voltage change. In contrast, the peak value formation reacts with a time constant of only 2 s.
  • the comparators give an alarm.
  • the potentiometers are set to 50%.
  • the peak value voltage U 1 changes on the one potentiometer and cuts the mean value U o (at 27) when the voltage increases by 50%, and the first coparator 20 gives an alarm (BAA).
  • the Peak value around 50% within a predetermined time interval 28 gives the second comparator 21 alarm A i B, since the voltage U 2 at the second potentiometer reaches the mean value (at 29) (cf. FIG. 3).
  • the invention has the advantage that a very strong output signal is obtained by the coils 9, 10 surrounding the pouring tube 7, that this output signal is only slightly falsified by accumulation of steel in the pouring tube and that even at high operating temperatures (about 850 ° C. ) unadulterated measurement results are obtained, cooling of the coils 9, 10 being unnecessary.
  • the invention is not limited to the exemplary embodiment shown, but can be modified in various ways. For example, one can also monitor the molten metal (molten steel) flowing from an intermediate vessel 6 via a pouring tube into the mold in a continuous casting plant.
  • molten metal molten steel

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
EP85890072A 1984-04-05 1985-03-21 Procédé pour couler du métal fondu ainsi que dispositif pour la mise en oeuvre de ce procédé Withdrawn EP0158628A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT0115584A AT379534B (de) 1984-04-05 1984-04-05 Verfahren zum giessen von metallschmelze sowie vorrichtung zur durchfuehrung des verfahrens
AT1155/84 1984-04-05

Publications (2)

Publication Number Publication Date
EP0158628A2 true EP0158628A2 (fr) 1985-10-16
EP0158628A3 EP0158628A3 (fr) 1987-01-07

Family

ID=3507799

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85890072A Withdrawn EP0158628A3 (fr) 1984-04-05 1985-03-21 Procédé pour couler du métal fondu ainsi que dispositif pour la mise en oeuvre de ce procédé

Country Status (5)

Country Link
US (1) US4635832A (fr)
EP (1) EP0158628A3 (fr)
JP (1) JPS60227968A (fr)
AT (1) AT379534B (fr)
CA (1) CA1230728A (fr)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3527349A1 (de) * 1985-07-31 1987-02-12 Wiederaufarbeitung Von Kernbre Verfahren und anordnung zur kontinuierlichen messung der fuellstandshoehe einer radioaktiven glasschmelze
US4859940A (en) * 1987-09-09 1989-08-22 Westinghouse Electric Corp. Apparatus for detecting onset of slag entrainment in a molten metal stream
US4810988A (en) * 1988-06-20 1989-03-07 Westinghouse Electric Corp. Slag detector transducer coil assembly
US5042700A (en) * 1989-05-12 1991-08-27 Stopinc Aktiengesellschaft Process and equipment to determine disturbance variables when pouring molten metal from a container
US6539805B2 (en) 1994-07-19 2003-04-01 Vesuvius Crucible Company Liquid metal flow condition detection
US6337566B1 (en) * 1997-12-08 2002-01-08 Nippon Steel Corporation Continuous casting apparatus using a molten metal level gauge
FR2806800B1 (fr) * 2000-03-23 2002-10-11 Alstom Dispositif pour effectuer des controles non destructifs par courant de foucault
EP1384997B1 (fr) * 2002-07-25 2004-09-29 Amepa Angewandte Messtechnik Und Prozessautomatisierung Gmbh Méthode et dispositif pour traiter des signaux de courant de foucault
EP2383056B1 (fr) * 2010-04-28 2016-11-30 Nemak Dillingen GmbH Procédé et appareil pour dispositif de détection de métaux sans contact
EP2564173B1 (fr) * 2010-04-30 2019-05-22 AGELLIS Group AB Mesures dans des cuves métallurgiques
US9964498B2 (en) * 2015-09-11 2018-05-08 Baylor University Electromagnetic steam energy/quality, flow, and fluid property sensor and method
EP3326735B1 (fr) * 2016-11-29 2020-07-22 Refractory Intellectual Property GmbH & Co. KG Procédé et dispositif de détection de dimensions dans le bec verseur d'un récipient métallurgique

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2358074B2 (de) * 1973-11-21 1977-05-12 Institut Elektrosvarki Imeni E.O. Patona Akademii Nauk Ukrainskoj Ssr, Kiew (Sowjetunion) Kontaktloser induktionsgeber zur bestimmung der trennungsgrenze zweier medien
DE2745799A1 (de) * 1976-10-25 1978-04-27 Asea Ab Anordnung an ausflussoeffnungen von metallurgischen behaeltern zur anzeige von schlacke im abgiesstrahl
AT350090B (de) * 1975-12-17 1979-05-10 Voest Ag Verfahren und einrichtung zum verschliessen des stichloches eines metallurgischen gefaesses
JPS5691974A (en) * 1979-12-27 1981-07-25 Toshiba Corp Controller for cast molten metal level
AT364754B (de) * 1980-01-25 1981-11-10 Voest Alpine Ag Verfahren zum verhindern des eindringens von schlacke in eine stranggiesskokille beim stranggiessen sowie einrichtung zur durchfuehrung des verfahrens
AT365497B (de) * 1980-03-05 1982-01-25 Voest Alpine Ag Verfahren zum ermitteln der in einem zwischengefaess befindlichen schlackenmenge waehrend des stranggiessens sowie einrichtung zur durchfuehrung des verfahrens
FR2532208A1 (fr) * 1982-08-24 1984-03-02 Siderurgie Fse Inst Rech Appareil de detection de l'apparition de laitier dans les jets de coulee
SU1089140A1 (ru) * 1983-01-06 1984-04-30 Всесоюзный ордена Ленина научно-исследовательский и проектно-конструкторский институт металлургического машиностроения Устройство дл определени момента окончани слива металла из металлургической емкости

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1472142A (fr) * 1965-12-31 1967-03-10 Crouzet Sa Nouveau sélecteur de pièces de monnaie pour distributeurs automatiques
DE2637421C2 (de) * 1976-08-17 1978-03-02 Mannesmann Ag, 4000 Duesseldorf Verfahren und Vorrichtung zum Anzeigen des Gießendes beim Vergießen von Metallen aus GießgefäBen
JPS5830632B2 (ja) * 1977-06-21 1983-06-30 富士電機株式会社 硬貨選別装置
JPS5931422B2 (ja) * 1978-11-10 1984-08-02 新日本製鐵株式会社 溶融金属注入終点検知方法
JPS5597846A (en) * 1979-01-16 1980-07-25 Kawasaki Steel Corp Slag detecting method in molten metal passage
LU83699A1 (de) * 1981-10-16 1983-06-08 Arbed Verfahren zum ueberwachen einer stranggiesskokille im betrieb

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2358074B2 (de) * 1973-11-21 1977-05-12 Institut Elektrosvarki Imeni E.O. Patona Akademii Nauk Ukrainskoj Ssr, Kiew (Sowjetunion) Kontaktloser induktionsgeber zur bestimmung der trennungsgrenze zweier medien
AT350090B (de) * 1975-12-17 1979-05-10 Voest Ag Verfahren und einrichtung zum verschliessen des stichloches eines metallurgischen gefaesses
DE2745799A1 (de) * 1976-10-25 1978-04-27 Asea Ab Anordnung an ausflussoeffnungen von metallurgischen behaeltern zur anzeige von schlacke im abgiesstrahl
JPS5691974A (en) * 1979-12-27 1981-07-25 Toshiba Corp Controller for cast molten metal level
AT364754B (de) * 1980-01-25 1981-11-10 Voest Alpine Ag Verfahren zum verhindern des eindringens von schlacke in eine stranggiesskokille beim stranggiessen sowie einrichtung zur durchfuehrung des verfahrens
AT365497B (de) * 1980-03-05 1982-01-25 Voest Alpine Ag Verfahren zum ermitteln der in einem zwischengefaess befindlichen schlackenmenge waehrend des stranggiessens sowie einrichtung zur durchfuehrung des verfahrens
FR2532208A1 (fr) * 1982-08-24 1984-03-02 Siderurgie Fse Inst Rech Appareil de detection de l'apparition de laitier dans les jets de coulee
SU1089140A1 (ru) * 1983-01-06 1984-04-30 Всесоюзный ордена Ленина научно-исследовательский и проектно-конструкторский институт металлургического машиностроения Устройство дл определени момента окончани слива металла из металлургической емкости

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, Band 5, Nr. 166 (M-93)[838], 23. Oktober 1981; & JP - A - 56 091974 (TOKYO SHIBAURA) 25.07.1981 *

Also Published As

Publication number Publication date
ATA115584A (de) 1985-06-15
JPS60227968A (ja) 1985-11-13
EP0158628A3 (fr) 1987-01-07
AT379534B (de) 1986-01-27
US4635832A (en) 1987-01-13
CA1230728A (fr) 1987-12-29

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