EP0380774B1 - Verfahren und Einrichtung zur Regelung der Giessspiegelhöhe im Giessraum einer Bandstranggiessanlage - Google Patents

Verfahren und Einrichtung zur Regelung der Giessspiegelhöhe im Giessraum einer Bandstranggiessanlage Download PDF

Info

Publication number
EP0380774B1
EP0380774B1 EP89121941A EP89121941A EP0380774B1 EP 0380774 B1 EP0380774 B1 EP 0380774B1 EP 89121941 A EP89121941 A EP 89121941A EP 89121941 A EP89121941 A EP 89121941A EP 0380774 B1 EP0380774 B1 EP 0380774B1
Authority
EP
European Patent Office
Prior art keywords
level
electrode
molten metal
casting
eddy current
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 - Lifetime
Application number
EP89121941A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0380774A3 (de
EP0380774A2 (de
Inventor
Tsuneo Sasaki
Hirotaka Tanaka
Kouichi Ohno
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.)
Krupp Stahl AG
Original Assignee
Krupp Stahl 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 Krupp Stahl AG filed Critical Krupp Stahl AG
Publication of EP0380774A2 publication Critical patent/EP0380774A2/de
Publication of EP0380774A3 publication Critical patent/EP0380774A3/de
Application granted granted Critical
Publication of EP0380774B1 publication Critical patent/EP0380774B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • B22D11/16—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
    • 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
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • B22D11/0637—Accessories therefor
    • B22D11/064—Accessories therefor for supplying molten metal

Definitions

  • the invention relates to a method for controlling the level of the casting level in the casting room of a continuous casting machine, in which the level of the bath level is measured continuously and deviations from a predetermined level are converted into control signals for shifting the level to the specified level, whereby in addition to the continuous contactless level measurement by means of an eddy current sensor at least an actual value of the level of the casting level is measured by the contact of an electrode with the level of the level which can be detected with respect to its height, and the actual value of the contact measurement is used to calibrate the eddy current measurement.
  • the melt itself then creates a conductive connection between the two electrodes and thus triggers a signal indicating this actual value of the level of the mold level, which signal is used to calibrate the eddy current sensor.
  • the actual value of the mold level is not measured at any time, but rather it is confirmed that certain actual values are reached when the melt comes into contact with the counter electrodes.
  • liquid steel will attach to the electrodes of the electrode sensor.
  • the approach of the liquid steel forms a bridge between the electrodes and solidifies slightly, which means that there is a fear that the conductive state will be maintained even if the bath level later drops again.
  • This measuring method which is based on the conductive state of the electrode sensor, is indeed suitable for detecting the bath level at the time of the start of the casting process, but can no longer record the level of the molten steel with high accuracy if the casting level is at its predetermined value, i.e. a certain amount has reached steady state.
  • the bath rises depending on the supply of the molten steel, with no bridge forming to keep the electrodes in a conductive state, so that a certain bath level height can be exactly detected.
  • the mold level measurement must therefore show sensitive fluctuations in the height of the mold level.
  • Continuous, non-contact measurement using an eddy current sensor is very suitable for this purpose, but the measurement result also includes eliminable influences from the electromagnetic properties of the environment. These environmental influences are not fundamentally constant due to thermal deformations of the device and can thus lead to more or less significant distortions in the height measurement and to errors in the mold level control in the course of the casting time.
  • the object of the invention is to avoid these disadvantages and the disadvantages inherent in a stationary electrode sensor and to provide a method for regulating the level of the mold level, the reliability of which is maintained over the entire casting time.
  • Another object of the invention is to provide a device which is particularly suitable for solving the process technology.
  • the object is achieved in that the contact measurement is repeated periodically throughout the casting by means of a vertically movable electrode and the eddy current measurement is calibrated after each repetition.
  • the electrode passes through a stationary light barrier on its lowering path in the direction of the bath level before reaching the bath level and the travel of the electrode from the light barrier to contact with the casting level is measured in order to record the actual value of the level of the casting level.
  • a device for regulating the level of the casting level in the casting room of a continuous casting line is proposed with an eddy current sensor above the melting bath, with an electrode which is in contact with the melt when the actual value of a level of the leveling level is detected, with a control device to which the eddy current sensor and the electrode are connected and which contains a program with which the continuous signal sequences of the eddy current sensor can be converted into control signals, taking into account the actual value signal of the electrode, with which at least one of the casting parameters feed quantity of the molten metal into the casting chamber and casting speed for the purpose of shifting the Casting level can be changed to a predetermined level.
  • the electrode can be moved vertically and the path of travel of the electrode can be detected, and that a light barrier or the like is arranged above the weld pool and above the highest intended height of the casting level and in the path of travel of the electrode.
  • a graphite electrode is expediently used to largely rule out melting of the electrode on the electrode.
  • the eddy current sensor 5 is connected to a control unit 7 via a line 6.
  • An electrode 8 is arranged on an electrode suspension 9 above the weld pool 3 and can be moved vertically by activating a reversible stepper motor 10.
  • the respective position of the electrode 8 is entered into the control unit by the stepper motor via a line 11.
  • the dashed electrode 8 ' has contact with the casting mirror 4, whereby a contact is triggered by the contact with the electrode 8', which is also transmitted to the control unit 7 via the electrode suspension 9 and the line 11.
  • a light barrier consisting of transmitter 12, receiver 13 and light beam, here a laser beam 14, is also connected to control unit 7 via a further line 15.
  • a deflection roller 16 and a shielding tube 17 are provided.
  • the travel path 18 of the electrode 8 is indicated by a dash-dotted line which crosses the light beam 14 of the light barrier at point A; contact point B is assigned to the lower position of electrode 8 '.
  • FIG. 2 shows a top view of the casting vessel 1 of a belt casting installation, a shielding plate 19 being provided here between the eddy current sensor 5 and the electrode 8.
  • a carrying device 20 holds the eddy current sensor 5.
  • the casting nozzle 21 which forms the casting slot in a two-roll belt casting machine together with two cooled casting rolls, not shown, arranged one above the other.
  • the mold level H is plotted against the casting time t, where h1, h2, h3, h4 is a height difference between the value indicated by the eddy current sensor 5 and measured by the electrode 8 at the casting times t1, t2, t3 and t4 specify.
  • 1 is a system for direct measurement of the bath level using the touch method, with the aim of obtaining the correction information for the eddy current sensor 5.
  • a touch-type measuring terminal namely an electrode 8 is attached above the bath level 4 and is moved up and down at a constant speed by means of the stepping motor 10 or a similar motor which can measure the rotation exactly.
  • the electrode 8 is made of graphite, so that a current can flow when it contacts the lower end of the bath level 4. It moves up and down in travel path 18. So that you can see whether the electrode 8 is at point A or not, the optical system consisting of transmitter 12 and receiver 13 is installed. If e.g. B.
  • a laser beam 14 is emitted from the transmitter 12, the light path being interrupted by the electrode 8, it is perceived that the electrode 8 is located at point A.
  • another sensor element - such as. B. a limit switch - can also be used.
  • the electrode 8 is lowered from the stepping motor 10 to the contact point B. If this is an electrode 8 made of graphite, this is put under tension via a wire. If the electrode 8 touches the bath level 4, a current flows, the detection of which can be used as evidence of whether the electrode 8 is at the contact point B or not.
  • the movement distance between point A and contact point B can be found out by counting the steps on the stepping motor 10.
  • the mold level 4 of the melting bath 3 can be measured with a high accuracy of less than +/- 0.1 mm.
  • the mold level 4 measured in this way is fed to the control unit 7 in order to be used as information for the correction of the value measured by the eddy current sensor 5. Since point A can be set at a point distant from the bath level 4 using the above-mentioned method, it is to be avoided that the electrode 8 is exposed to a high temperature of the heat radiated from the bath level 4. This means that the bath level 4 can be measured with high accuracy without being influenced by temperatures and thermal expansion, etc.
  • the electrode 8 can be used repeatedly because the measuring principle for detecting the bath level is not based on a conductive state. Furthermore, since the electrode 8 located at the contact point B is detected with the help of the laser beam 14 when starting up again, the liquid steel or the base metal which is being deposited has no influence on the measuring accuracy. When the electrode 8 moves up or down, its position and movement could influence the measurement result of the eddy current sensor 5. It is therefore recommended to attach a shielding tube 17 or a shielding plate 19 around the electrode 8.
  • FIG 2 shows a top view of how the electrode 8 is shielded from the eddy current sensor 5 by the shielding plate 19. Waves form on the bath surface during the supply of the liquid steel or the casting process, which can also influence the measurement result of the electrode 8.
  • electrodes 8 can be arranged at several points in the casting chamber, so that the casting level 4 can be detected based thereon by one or more of the electrodes 8 responding by contact with the bath level 4; thus the influence of wave formation can be suppressed.
  • the invention was tested with a two-roll belt casting machine in the production of stainless steel strips.
  • Liquid stainless steel with SUS 304 composition was fed to the melt pool 3 and tapes cast 2.0 mm thick and 650 mm wide.
  • the behavior of the casting level 4 of the liquid steel supplied to the molten bath 3 after the start of the feed was recorded as a diagram in FIG. 3, which showed an increasing curve.
  • the bath level 4 was measured by means of the electrode 8 at the time t1 during the supply of liquid steel, the value measured by the eddy current sensor 5 was subject to error h1.
  • the error h1 is calculated in the control unit 7 so that the value detected by the eddy current sensor 5 is corrected upwards.
  • the level in the casting room 2 increased even further.
  • the measured value of the eddy current sensor 5 had an error h2.
  • the value detected by the eddy current sensor 5 was corrected upwards in the same way.
  • the bath level was measured periodically by means of the electrode 8.
  • the respective measured value of the eddy current sensor 5 was corrected upwards or downwards accordingly. In this way, the liquid steel was fed while maintaining the casting level 4 at the desired level, so that strips were cast.
  • the example explained above was a continuous casting machine using the duo-roll process with different roll diameters.
  • the present invention is in no way restricted by the example explained here and can be applied to the other continuous casting machines which work with the duo-roll, single drum, single belt, duo belt, roller belt method and others, in which the liquid steel released in the bath is rapidly removed Cooling and solidification tapes are made.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
EP89121941A 1989-02-02 1989-11-28 Verfahren und Einrichtung zur Regelung der Giessspiegelhöhe im Giessraum einer Bandstranggiessanlage Expired - Lifetime EP0380774B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP22530/89 1989-02-02
JP1022530A JPH02205234A (ja) 1989-02-02 1989-02-02 薄肉鋳片連続鋳造における湯面レベル検出方法

Publications (3)

Publication Number Publication Date
EP0380774A2 EP0380774A2 (de) 1990-08-08
EP0380774A3 EP0380774A3 (de) 1992-01-29
EP0380774B1 true EP0380774B1 (de) 1994-11-02

Family

ID=12085353

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89121941A Expired - Lifetime EP0380774B1 (de) 1989-02-02 1989-11-28 Verfahren und Einrichtung zur Regelung der Giessspiegelhöhe im Giessraum einer Bandstranggiessanlage

Country Status (4)

Country Link
EP (1) EP0380774B1 (enrdf_load_stackoverflow)
JP (1) JPH02205234A (enrdf_load_stackoverflow)
AT (1) ATE113510T1 (enrdf_load_stackoverflow)
DE (1) DE58908599D1 (enrdf_load_stackoverflow)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8109670B2 (en) * 2003-03-31 2012-02-07 Saudi Arabian Oil Company Measurement of molten sulfur level in receptacles
BRPI0924932A2 (pt) * 2009-06-15 2015-07-07 Ihi Corp Método de lingotamento de tiras e máquina de lingotamento de cilindro duplo
CN111628625B (zh) * 2020-05-12 2021-12-10 中国科学技术大学 一种光控制的电场驱动液态金属液滴的装置

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3146360C2 (de) * 1981-11-23 1983-10-27 Wieland-Werke Ag, 7900 Ulm Vorrichtung zur Badspiegel-Höhenregelung in einer Stranggießkokille
DE3323749A1 (de) * 1983-07-01 1985-01-03 Norddeutsche Affinerie AG, 2000 Hamburg Verfahren zur regelung der badspiegelhoehe einer metallschmelze
EP0194327A1 (de) * 1985-03-09 1986-09-17 Fried. Krupp Gesellschaft mit beschränkter Haftung Einrichtung zur Regelung der Lage des Giessspiegels innerhalb einer Doppelbandstranggiesskokille
US4728875A (en) * 1986-10-20 1988-03-01 Allegheny Ludlum Corporation Method and apparatus for monitoring a liquid level

Also Published As

Publication number Publication date
JPH0513747B2 (enrdf_load_stackoverflow) 1993-02-23
EP0380774A3 (de) 1992-01-29
DE58908599D1 (de) 1994-12-08
JPH02205234A (ja) 1990-08-15
ATE113510T1 (de) 1994-11-15
EP0380774A2 (de) 1990-08-08

Similar Documents

Publication Publication Date Title
DE2757052A1 (de) Vorrichtung zur niveauueberwachung und -steuerung des geschmolzenen metalls in der gussform einer strang-gussmaschine
DE3423475A1 (de) Verfahren und einrichtung zum stranggiessen von fluessigen metallen, insbesondere von fluessigem stahl
EP0131979B1 (de) Verfahren zur Regelung der Badspiegelhöhe einer Metallschmelze
DE2655640C3 (de) Vorrichtung zur Bestimmung des Badspiegels in einer Stranggießkokille
EP0380774B1 (de) Verfahren und Einrichtung zur Regelung der Giessspiegelhöhe im Giessraum einer Bandstranggiessanlage
DE2951097C2 (de) Verfahren und Vorrichtung zur Regelung der Gießspiegelhöhe in Stranggießkokillen
EP3628416B1 (de) Verfahren und anlage zum stranggiessen eines metallischen produkts
DE19900599A1 (de) Schwallbadlötverfahren und dazu verwendetes System
DE2735402C2 (de) Verfahren und Vorrichtung zur Bahnverfolgung anhand von Markierungspunkten
EP0130635B1 (de) Verfahren zur Messung und Regelung des Füllstandes von in einem Behälter befindlichen Stoffen
DE3230074C2 (enrdf_load_stackoverflow)
DE102009057861A1 (de) Vorrichtung zur Detektion des Durchflusses und Verfahren hierfür
EP1152850A1 (de) Verfahren zum erfassen und regeln der füllstandshöhe des flüssigen metalls in einer kokille
DE3020843C2 (de) Verfahren zur Regelung der Breite eines Glasbandes bei der Herstellung von Schwimmglas
DE69016413T2 (de) Verfahren und elektronische Vorrichtung zum Messen eines Spaltes.
DE3934975A1 (de) Verfahren zur regelung der lage des giessspiegels in einer bandstranggiessanlage und einrichtung hierzu
DE1504740B2 (de) Vorrichtung zum regeln des abstandes zwischen einer giesswalze und einem giessbehaelter
DE3811834A1 (de) Verfahren und vorrichtung zum widerstandsbuckelschweissen mit qualitaetsueberwachung der schweissung
DE69129735T2 (de) Verfahren und Vorrichtung zur Bestimmung der Beschaffenheit eines Giessbandes sowie der Beschichtung des Bandes beim kontinuierlichen Giessen
DE3020842C2 (de) Verfahren zur Regelung der Breite eines Glasbandes bei der Herstellung von Schwimmglas
DE3009697C2 (enrdf_load_stackoverflow)
AT508790B1 (de) Verfahren und vorrichtung zum vergiessen von metallischer schmelze zu stranggegossenen vorprodukten in einer stranggiessmaschine
DE3146360C2 (de) Vorrichtung zur Badspiegel-Höhenregelung in einer Stranggießkokille
DE944990C (de) Verfahren und Einrichtung zum Feststellen und Regeln der Hoehenlage des Metallspiegels in Stranggiesskokillen
EP0153918B1 (de) Verfahren zum Ermitteln des Füllstandes von Schmelze in einer oszillierenden Kokille einer Stranggiessanlage und Einrichtung zur Durchführung des Verfahrens

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): AT DE ES FR GB IT SE

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): AT DE ES FR GB IT SE

17P Request for examination filed

Effective date: 19920219

17Q First examination report despatched

Effective date: 19930726

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT DE ES FR GB IT SE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRE;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.SCRIBED TIME-LIMIT

Effective date: 19941102

Ref country code: GB

Effective date: 19941102

Ref country code: ES

Free format text: THE PATENT HAS BEEN ANNULLED BY A DECISION OF A NATIONAL AUTHORITY

Effective date: 19941102

Ref country code: FR

Effective date: 19941102

REF Corresponds to:

Ref document number: 113510

Country of ref document: AT

Date of ref document: 19941115

Kind code of ref document: T

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AT

Effective date: 19941128

REF Corresponds to:

Ref document number: 58908599

Country of ref document: DE

Date of ref document: 19941208

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Effective date: 19950202

EN Fr: translation not filed
GBV Gb: ep patent (uk) treated as always having been void in accordance with gb section 77(7)/1977 [no translation filed]

Effective date: 19941102

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20071123

Year of fee payment: 19

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20090603