EP0200981A2 - Procédé de réglage automatique de l'opération de démarrage d'une installation de coulée continue de métal - Google Patents

Procédé de réglage automatique de l'opération de démarrage d'une installation de coulée continue de métal Download PDF

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Publication number
EP0200981A2
EP0200981A2 EP86105504A EP86105504A EP0200981A2 EP 0200981 A2 EP0200981 A2 EP 0200981A2 EP 86105504 A EP86105504 A EP 86105504A EP 86105504 A EP86105504 A EP 86105504A EP 0200981 A2 EP0200981 A2 EP 0200981A2
Authority
EP
European Patent Office
Prior art keywords
opening
degree
outflow
fill level
normal
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Withdrawn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
EP86105504A
Other languages
German (de)
English (en)
Other versions
EP0200981A3 (fr
Inventor
André Kraus
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.)
Arcelor Luxembourg SA
Original Assignee
Arbed SA
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 Arbed SA filed Critical Arbed SA
Publication of EP0200981A2 publication Critical patent/EP0200981A2/fr
Publication of EP0200981A3 publication Critical patent/EP0200981A3/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Withdrawn legal-status Critical Current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
    • 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
    • B22D11/161—Controlling or regulating processes or operations for automatic starting the casting process
    • 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
    • B22D11/20—Controlling or regulating processes or operations for removing cast stock
    • B22D11/201—Controlling or regulating processes or operations for removing cast stock responsive to molten metal level or slag level
    • B22D11/206—Controlling or regulating processes or operations for removing cast stock responsive to molten metal level or slag level by using X-rays or nuclear radiation

Definitions

  • the invention relates to a method for automatically controlling the start-up operation of a metal continuous casting installation.
  • a system essentially consists of a water-cooled mold which is supplied with melt from a vessel provided with a controllable bottom outflow opening via a dip tube, and a take-off machine for the solidifying strand.
  • the mold is provided with a fill level measuring device, by means of which the opening of the floor discharge or in free-wheel operation the speed of rotation of the take-off rollers is controlled during operation.
  • the lower mold opening is closed with a cold strand.
  • the molten steel is welded to the start-up head, which usually contains refrigerated scrap.
  • the water-cooled mold removes so much heat from the molten metal that a solidified shell forms.
  • the extraction machine is switched on and the cold strand is continuously drawn off with the solidifying strand.
  • the further continuous casting is then subjected to a conventional mold level control.
  • the object of the invention is to propose a method for automatically controlling the start-up mode, which overcomes the disadvantages mentioned above and ensures problem-free casting of small cross sections.
  • the upper end of the water-cooled continuous casting mold 1 is supplied with melt 3 via a dip tube 2.
  • the melt 3 is located in an intermediate container 4, the outflow opening 5 of which can be closed with a stopper 6.
  • the position of the stopper 6 is determined by a hydraulic actuator 17.
  • the position of the actuator is influenced by the positioner 7.
  • the lower side of the mold is closed with the start head 8, on which cooling scrap 11 is located; the cold strand 9 connected to it is clamped in the take-off rollers 10.
  • a radiation source 12 usually Co-60, which extends over a height H.
  • the radiation originating from the source 12 is recorded by a sensor 13.
  • the received signal is forwarded to the control and control unit 15.
  • the bath level is deduced from the radiation attenuation.
  • the fill level is given as a percentage of the measuring range. For example, the target level is 70%, i.e. the target level is reached when an output signal of 70 percent of the maximum value is present.
  • the regulating and control unit 15 which is shown in somewhat more detail in FIG. 2, receives the fill level values from the amplifier 14 and the respective position of the plug 6 from the actuator 17 and acts on the positioner 7 and on the controller 16 of the extraction machine. The regulating and control unit 15 is also informed of the respective take-off speed of the (cold) strand via a tachometer 18 attached to a take-off roller.
  • FIG. 2 shows details of the regulating and control unit.
  • the position of the various switches before the start of casting is shown. Using known electronic measures, the switches change the position only once, i.e. If the metal mirror falls during casting, the switches cannot fall back into their start-up operating position.
  • Capacitor 38 maintains the instant stopper zero position.
  • a voltage is tapped at the potentiometer 20, which experience has shown to lead to the normal stopper position during casting, while the desired bath height in the mold is set via the potentiometer 30.
  • the limit indicator 31 acts on the switching devices 24, 26 and 29, and on the control unit 16 as soon as the metal has reached predetermined fill levels in the mold.
  • the multiplier module 25 the stopper position set via the potentiometer 20 (the zero position of which is taken into account by means of the capacitor 38 and the amplifier 19) is multiplied by a value proportional to the withdrawal speed of the line.
  • the circuit further comprises an I controller 27 and a P controller 28, the controllers being used not only to control the start-up operation but also to regulate the normal casting operation.
  • the switch 23 is closed and at the same time the switch 22 is opened.
  • the zero position correction of the stopper is thus recorded in the capacitor and the opening setpoint determined on the potentiometer is passed directly to the positioner 7 after a zero correction by the adder 21.
  • this opening setpoint advantageously corresponds to the middle stopper position during casting.
  • the bottom outlet opening should neither be opened too far, because otherwise a steel overflow will be preprogrammed, nor too small, because then the spout or the plug will smear.
  • the casting machine is started.
  • the switch unit 24 is switched over; the stopper opening setpoint is thus additionally changed by means of the multiplier module 25 as a function of the current casting speed.
  • the signal emitted by the tachometer is standardized for this purpose, ie the multiplier value is between 0 (casting machine is stationary) and 1 (target speed has been reached). This ensures that the stopper is first moved briefly in the closing direction (Giessge speed is low) and then opened in proportion to the run-up curve of the fume cupboard. If there is a breakdown in the fume cupboard, the outflow opening is closed as quickly as possible.
  • the multiplier value can be linear or, for example, logarithmically linear in a first speed range and ultimately exponential depending on the casting speed. Especially in the case of very small cross-sections (less than 100mm), routine tests are required to carefully try out which mathematical (partial) dependencies of the multiplier value on the casting speed optimally prevent breakthrough or overflow during casting.
  • the P-channel 28 of the control is then switched on by closing the switch unit 29.
  • the stopper position is subjected to a classic I-P control, in which the actual value output by the amplifier 14 is compared with a setpoint determined by the potentiometer 30 and the stopper position is changed in the event of a deviation.
  • a classic I-P control in which the actual value output by the amplifier 14 is compared with a setpoint determined by the potentiometer 30 and the stopper position is changed in the event of a deviation.
  • pulling in the P branch prematurely leads to violent fluctuations in the metal quantity supply and an increased risk of steel overflow. Under no circumstances may the P controller be switched on before the 1 controller.
  • switch 221 Before the start of casting, switch 221 is closed; switch 222 is thus open.
  • the switch 123 When casting on, the switch 123 is closed (time to - see FIG. 4) and the stopper 6 moves from the zero position Wo to the maximum value WM specified by the potentiometer.
  • time t1 After approximately 1 second (time t1), switch 123 is opened (switch 122 is closed) and the stopper moves back into its new zero position Wol, which is caused by hardened metal.
  • the switches 221 and 222 are switched over, so that now the setpoint set in the potentiometer 120 controls the position of the stopper as soon as the switch 123 (time t3) is closed again.
  • the waiting time t2 to t3 depends on the type of distributor, the degree of overheating of the melt, the steel grade, etc. and is between 0 and approx. 15 seconds. Even if a pause is not required, it has proven advantageous to briefly close the bottom outflow opening completely in order to be able to take into account the instantaneous zero position of the plug Wo1 in the subsequent process step by means of the capacitor 118. From time t3, the procedure is as stated above, i.e. the plug moves into a position Wc, which depends on the voltage tapped at the potentiometer 120 and the charge on the capacitor 138. At time t5, approx. 20% of the fill level is reached, the extraction machine is started; at 30% of the fill level, the I controller takes over control, etc.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Toxicology (AREA)
  • Continuous Casting (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
EP86105504A 1985-05-07 1986-04-21 Procédé de réglage automatique de l'opération de démarrage d'une installation de coulée continue de métal Withdrawn EP0200981A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
LU85878 1985-05-07
LU85878A LU85878A1 (de) 1985-05-07 1985-05-07 Verfahren zur automatischen steuerung des anfahrbetriebes einer metall-stanggiessanlage

Publications (2)

Publication Number Publication Date
EP0200981A2 true EP0200981A2 (fr) 1986-11-12
EP0200981A3 EP0200981A3 (fr) 1988-10-05

Family

ID=19730456

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86105504A Withdrawn EP0200981A3 (fr) 1985-05-07 1986-04-21 Procédé de réglage automatique de l'opération de démarrage d'une installation de coulée continue de métal

Country Status (3)

Country Link
US (1) US4774999A (fr)
EP (1) EP0200981A3 (fr)
LU (1) LU85878A1 (fr)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3905328C1 (fr) * 1989-02-17 1990-07-19 Mannesmann Ag, 4000 Duesseldorf, De
CH682376A5 (de) * 1990-02-28 1993-09-15 Stopinc Ag Verfahren zum automatischen Angiessen von einer Stranggiessanlage.
FR2677284B1 (fr) * 1991-06-07 1993-08-27 Pechiney Aluminium Procede et appareillage pour la coulee automatique de demi-produits.
US5298887A (en) * 1991-10-04 1994-03-29 Sentech Corporation Molten metal gauging and control system employing a fixed position capacitance sensor and method therefor
AUPO591697A0 (en) * 1997-03-27 1997-04-24 Bhp Steel (Jla) Pty Limited Casting metal strip
FR2766113B1 (fr) * 1997-07-16 1999-09-17 Usinor Procede de demarrage d'une operation de coulee continue des metaux
ITMI20010958A1 (it) * 2001-05-10 2002-11-10 Ori Martin Acciaieria E Ferrer Procedimento e dispositivo per il controllo del livello dell'accaio in colata continua in lingotteria
AT512214B1 (de) * 2011-12-05 2015-04-15 Siemens Vai Metals Tech Gmbh Prozesstechnische massnahmen in einer stranggiessmaschine bei giessstart, bei giessende und bei der herstellung eines übergangsstücks
CN103878334B (zh) * 2012-12-21 2016-04-27 宝山钢铁股份有限公司 一种插入式连铸机自动开浇控制方法
WO2019099480A1 (fr) * 2017-11-15 2019-05-23 Novelis Inc. Atténuation de dépassement ou de déficit de niveau de métal lors d'une transition de demande de débit

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL6711807A (fr) * 1966-09-26 1968-03-27
JPS589757A (ja) * 1981-07-09 1983-01-20 Nippon Steel Corp 連続鋳造における溶鋼注入制御方法
JPS5877761A (ja) * 1981-10-31 1983-05-11 Mitsubishi Heavy Ind Ltd モ−ルド内溶鋼レベル制御装置
JPS5884652A (ja) * 1981-11-13 1983-05-20 Kawasaki Steel Corp 連続鋳造の自動鋳込み制御方法
DE3421344C2 (de) * 1984-06-08 1993-04-29 Krupp Stahl Ag, 4630 Bochum Verfahren und Vorrichtung zum automatischen Füllen einer Stranggießkokille beim Angießen eines Stranges
DE3509932A1 (de) * 1985-03-19 1986-10-02 Metacon AG, Zürich Verfahren zum anfahren einer stranggiessanlage

Also Published As

Publication number Publication date
LU85878A1 (de) 1986-12-05
EP0200981A3 (fr) 1988-10-05
US4774999A (en) 1988-10-04

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