EP0380774A2 - Procédé et dispositif pour le réglage du niveau de surface du bain dans l'entonnoir de coulée d'une installation de coulée continue en bande - Google Patents

Procédé et dispositif pour le réglage du niveau de surface du bain dans l'entonnoir de coulée d'une installation de coulée continue en bande Download PDF

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Publication number
EP0380774A2
EP0380774A2 EP89121941A EP89121941A EP0380774A2 EP 0380774 A2 EP0380774 A2 EP 0380774A2 EP 89121941 A EP89121941 A EP 89121941A EP 89121941 A EP89121941 A EP 89121941A EP 0380774 A2 EP0380774 A2 EP 0380774A2
Authority
EP
European Patent Office
Prior art keywords
level
casting
electrode
eddy current
contact
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.)
Granted
Application number
EP89121941A
Other languages
German (de)
English (en)
Other versions
EP0380774A3 (fr
EP0380774B1 (fr
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/fr
Publication of EP0380774A3 publication Critical patent/EP0380774A3/fr
Application granted granted Critical
Publication of EP0380774B1 publication Critical patent/EP0380774B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B22D11/16—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, with at least in addition to the continuous non-contact level measurement using an eddy current sensor 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.
  • 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 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, contactless 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. Due to thermal deformations of the device, these environmental influences are not fundamentally constant 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 retained 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 by means of a vertically movable electrode is repeated periodically throughout the casting 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 carrying out the method according to the invention is based on a device for regulating the level of the casting level in the casting room of a continuous strip casting installation 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 height level of the casting 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 supply quantity of the molten metal into the casting chamber and casting speed for the purpose the displacement of the mold 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 molten bath 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 in order to largely rule out melting of the electrode on the electrode.
  • the casting vessel 1 shows a casting vessel 1 in section from a continuous strip casting plant, the casting chamber 2 of which contains a molten bath 3.
  • the surface of the melting bath 3, which is clearly illustrated with excessive waves, is the casting level 4 in the casting operation, which is to be kept at a predetermined height during strip casting.
  • an eddy current sensor 5 is arranged in a fixed manner in the casting chamber 2, with the aid of which the height of the casting level 4 is continuously measured without contact by changing the flux density in a coil.
  • the eddy current sensor 5 is understood to mean a coil through which current flows, which is known to generate a magnetic field due to the current flowing through it.
  • the magnetic field is influenced when an electrically conductive body, here the mold level 4, approaches it. This influencing causes a change in the current flow in the coil, which can be detected and converted into a height value of the mold level 4.
  • 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 molten bath 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 signal is triggered by the contact from 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; the lower position of the electrode 8 'is assigned to the contact point B.
  • 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 over 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 for the casting times t1, t2, t3 and t4 specify.
  • 1 is a system for the 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 mirror 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 stepper 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 upwards or downwards, it could happen that its position and movement 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 surface of the bath 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 supplied to the molten bath 3 and tapes cast with a thickness of 2.0 mm and a width of 650 mm.
  • the behavior of the pouring level 4 of the molten steel supplied to the molten bath 3 after the start of the feed was recorded as a diagram in FIG. 3, which recorded an increasing curve.
  • the bath level 4 was measured by means of the electrode 8 at the point in time t1 during the supply of liquid steel, the value measured by the eddy current sensor 5 was subject to error h1.
  • error h1 is calculated in control unit 7 so that the value detected by eddy current sensor 5 is corrected upward.
  • 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 and 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 according to the duo-roller method with different roller diameters.
  • the present invention is in no way restricted by the example explained here and can be applied to the others according to the duo-roller, single drum, single belt, duo belt, roller belt method and others continuous casting machines are used, in which strips are produced from the liquid steel discharged in the bath by rapid cooling and solidification.

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  • 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 Procédé et dispositif pour le réglage du niveau de surface du bain dans l'entonnoir de coulée d'une installation de coulée continue en bande Expired - Lifetime EP0380774B1 (fr)

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 true EP0380774A2 (fr) 1990-08-08
EP0380774A3 EP0380774A3 (fr) 1992-01-29
EP0380774B1 EP0380774B1 (fr) 1994-11-02

Family

ID=12085353

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89121941A Expired - Lifetime EP0380774B1 (fr) 1989-02-02 1989-11-28 Procédé et dispositif pour le réglage du niveau de surface du bain dans l'entonnoir de coulée d'une installation de coulée continue en bande

Country Status (4)

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

Cited By (2)

* 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
CN118359471A (zh) * 2024-03-21 2024-07-19 西安近代化学研究所 一种推进剂药浆浇铸终点定位装置

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010146621A1 (fr) * 2009-06-15 2010-12-23 株式会社Ihi Procede de coulee en bande mince et machine de coulee entre cylindres
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 (fr) * 1985-03-09 1986-09-17 Fried. Krupp Gesellschaft mit beschränkter Haftung Dispositif pour le réglage de la position de la surface du bain à l'intérieur d'une lingotière de coulée continue à bande double
US4728875A (en) * 1986-10-20 1988-03-01 Allegheny Ludlum Corporation Method and apparatus for monitoring a liquid level

Cited By (2)

* 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
CN118359471A (zh) * 2024-03-21 2024-07-19 西安近代化学研究所 一种推进剂药浆浇铸终点定位装置

Also Published As

Publication number Publication date
ATE113510T1 (de) 1994-11-15
EP0380774A3 (fr) 1992-01-29
DE58908599D1 (de) 1994-12-08
JPH0513747B2 (fr) 1993-02-23
JPH02205234A (ja) 1990-08-15
EP0380774B1 (fr) 1994-11-02

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