EP1100639A1 - Procede et dispositif pour couler une brame a partir de metal liquide - Google Patents

Procede et dispositif pour couler une brame a partir de metal liquide

Info

Publication number
EP1100639A1
EP1100639A1 EP99948676A EP99948676A EP1100639A1 EP 1100639 A1 EP1100639 A1 EP 1100639A1 EP 99948676 A EP99948676 A EP 99948676A EP 99948676 A EP99948676 A EP 99948676A EP 1100639 A1 EP1100639 A1 EP 1100639A1
Authority
EP
European Patent Office
Prior art keywords
level
mold
casting
strand
liquid metal
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
EP99948676A
Other languages
German (de)
English (en)
Other versions
EP1100639B1 (fr
Inventor
Uwe STÜRMER
Bernhard Weisshaar
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.)
Siemens AG
Original Assignee
Siemens 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 Siemens AG filed Critical Siemens AG
Publication of EP1100639A1 publication Critical patent/EP1100639A1/fr
Application granted granted Critical
Publication of EP1100639B1 publication Critical patent/EP1100639B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • 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

Definitions

  • the invention relates to a method and a device for casting a strand of liquid metal, which is poured into a mold and pulled out of the mold.
  • a strand is poured from liquid metal using a mold and is pulled out of the mold.
  • An essential factor for a good quality of action of the strand cast in this way is keeping the casting level constant, ie the level of liquid metal in the mold. It is known to regulate the mold level.
  • the controller design is difficult because the parameters of the controlled system, ie the casting apparatus and the mold, are sometimes subject to strong fluctuations or disturbances affect the casting level.
  • liquid metal flows through a dip tube with an outlet opening m.
  • the inflow of liquid metal through the dip tube into the mold is influenced by a stopper.
  • it is an object of the invention to provide a method and a device for casting a strand ofdoseigem Me ⁇ tall indicate by means of a mold, by means of which and by means of which the effect on the meniscus by ex bruche of deposits, eg at the plug or Area of the dip tube can be reduced.
  • the object is achieved by a method according to claim 1, 2 or 3 and a device according to claim 8, 9 or 10.
  • the casting level i.e. the level of the liquid metal in the mold is regulated to a predetermined casting level setpoint by means of a casting level regulator.
  • the difference between the actual level and the target level is advantageously monitored and the level controller outputs a predetermined additional value if the difference between the actual level and the target level exceeds a tolerance threshold.
  • the object is also achieved by pouring a mold for casting a strand of liquid metal and pulling it out of a mold as a strand, the casting level, ie the level of the liquid metal in the mold, being applied to a predetermined casting level by means of a level control Setpoint is regulated, and the difference between the actual level of the casting level and the level of the casting level is advantageously monitored.
  • a predetermined additional value is added to the output of the mold level controller if the difference between the actual level of the mold level and the set level value exceeds a tolerance threshold. The sum of the additional value and the cisne ⁇ gem initial value of the mold level controller then forms the new output value of the mold level controller.
  • the object is achieved particularly advantageously in that a mold is poured for casting a strand of liquid metal and is pulled out of the mold as a strand, the mold level, ie the level of the liquid metal m of the mold, using a mold level regulator with at least one integrator a predetermined set level is regulated, and the difference between the actual level and the set level is advantageously monitored.
  • the output of the integrator of the mold level controller is replaced by a predetermined additional value if the difference between the actual level of the mold level and the set level value exceeds a tolerance threshold.
  • Supplements in this sense mean that the output of the integrator is replaced by the additional value, or that the additional value is added to the integrator output in a particularly advantageous manner, the sum of the additional value and the previous output value of the integrator forming the new output value of the integrator.
  • the tolerance threshold in particular as a function of the standard deviation, the difference between the actual level of the casting level and the desired level of the level or a quantity equivalent to the standard deviation, is adapted to the casting process. In this way it is possible to prevent mold level fluctuations by incorrectly recognizing an odor, even though there is no termination.
  • the tolerance threshold is limited to a value between 0.02 and 0.1, between 0.04 and 0.1 and / or between 0.06 and 0.1. In this way, the stability of a method according to the invention is increased. Further advantages and details result from the following description of exemplary embodiments. In detail show:
  • FIG. 4 shows an exemplary embodiment of an abort pre-control according to FIG. 2,
  • FIG. 5 shows a particularly advantageous exemplary embodiment of an abort pre-control according to FIG. 3.
  • liquid metal 13 in this case steel, is poured into a distributor tube 7.
  • the liquid metal flows out of the distribution channel 7 via a dip tube 5 with an outlet opening 6 into the mold 3.
  • a strand 1 is formed from the liquid metal and is pulled out of the mold 3 via rollers 4.
  • Chill mold 3 is influenced by a stopper 8, which is moved by a mechanism 9, which has a support arm and a lifting rod.
  • the lifting rod is in turn driven by a hydraulic cylinder 10, which is controlled or regulated via an automation device 12 depending on a hydraulic cylinder manipulated variable S.
  • the position of the lifting rod and thus the stopper position h is measured by means of a position measuring device 15 and transmitted to the automation device 12.
  • the arrangement has a mold level measuring device 11 which measures the mold level g, ie the level of liquid metal in the mold 3.
  • the casting mirror measuring device 11, like the position measuring device 15 and the hydraulic cylinder 10, is connected in terms of data technology to the automation device 12.
  • the automation device 12 regulates a casting level g.
  • the strand 1 pulled out of the mold 3 has a bottom pointed, ie a liquid core 2, and a solidified shell 14.
  • a mold level controller 20 and a stopper position controller 23 are provided to control the mold level g.
  • the mold level controller 20 has a P-element 21 and an integrator 22.
  • the casting level controller 20 determines a stopper position setpoint h * as a function of the difference between a casting level setpoint g * and the casting level g.
  • the stopper position controller 23 determines a manipulated variable s for the lifting cylinder 10 as a function of a stopper position control difference ⁇ h.
  • Stopper position control difference ⁇ h is the difference between stopper position setpoint h * and stopper position h.
  • an abort pilot control 24 is provided.
  • the abort pre-control determines an additional value c depending on the control deviation ⁇ g.
  • the output of the integrator 22 is supplemented with the additional value c and reset in a sampling step if the negative control deviation - ⁇ g exceeds a certain tolerance value.
  • the control deviation ⁇ g is the difference between the casting level setpoint g * and the casting level actual value g.
  • the termination feedforward control 24 and the termination feedforward control 25 differ essentially in that the tolerance thresholds according to the termination feedforward control 25 are determined over a certain time window as a function of the standard deviation ⁇ of the control deviation ⁇ g.
  • the standard deviation ⁇ is determined by means of the statistical block 26, which in the present exemplary embodiment is a standard deviation generator over a specific time window. However, it can be replaced by more complex statistical function blocks, as well as fuzzy logic or neural networks.
  • FIG. 4 shows a simple exemplary embodiment of an abort pre-control 24 according to FIG. 2. This has a negator
  • the abort pre-control has a tolerance value checker 31, a holding member 32 and a switch 33.
  • the holding element 32 closes the switch 33 for one scanning step.
  • the abort feedforward control 24 outputs an additional value c in this sampling scan. If the scan pre-control 24 outputs an additional value c, the output value of the integrator 22 m FIG 2 is supplemented by the additional value c and reset.
  • the additional value c is composed of a plurality of staggered values d, c 2 , c 3 , as is shown in FIG. 5 by way of example.
  • the particularly advantageous embodiment of the abort feedforward control 25 has a negator 30, holding members 32, tolerance value checkers 40, 41, 42, P members 43, 44, 45 with reinforcements KK 2 , K lr Limiter 46, 47, 48 and switches 49, 50 and 51 on.
  • tolerance values are provided for the tolerance value checkers 40, 41, 42, which are advantageously adapted to the casting process.
  • the standard deviation ⁇ is multiplied by a gain K 3 , K 2 , Ki by means of the P terms 43, 44, 45 and then limited by the limiters 46, 47, 48.
  • the initial value of the limiters 46, 47, 48 is the tolerance value that is used in the tolerance value checker 40, 41, 42.
  • the tolerance value checkers 40, 41, 42 it is checked whether the negative control deviation - ⁇ g exceeds this tolerance value. If one of the tolerance value checkers 40, 41, 42 determines that its tolerance value has been exceeded by the negative control deviation - ⁇ g, the corresponding holding element 32 closes the corresponding switch 49, 50, 51. According to the combination of closed switches 49, 50, 51, an additional value c spent. If an additional value c is present, the output of the integrator 22 in FIG. 3 is supplemented by the additional value c in this sampling step and reset.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)

Abstract

L'invention concerne un procédé permettant de couler une brame (1) à partir de métal liquide, ledit métal étant coulé dans une coquille (3) et extrait de la coquille sous forme de brame. Le niveau de coulée (g), c'est-à-dire le niveau du métal liquide dans la coquille (3), est régulé, au moyen d'un régulateur de niveau de coulée (20) comportant au moins un intégrateur (22), à une valeur théorique de niveau de coulée (g*) prédéterminée, et le signal de sortie de l'intégrateur (22) du régulateur de niveau de coulée (20) est remplacé par une valeur additionnelle (c) prédéterminée, si la différence ( DELTA g) entre la valeur réelle de niveau de coulée (g) et la valeur théorique de niveau de coulée (g*) dépasse un seuil de tolérance.
EP99948676A 1998-08-05 1999-07-23 Procede et dispositif pour couler une brame a partir de metal liquide Expired - Lifetime EP1100639B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19835421A DE19835421C2 (de) 1998-08-05 1998-08-05 Verfahren und Einrichtung zum Gießen eines Stranges aus flüssigem Metall
DE19835421 1998-08-05
PCT/DE1999/002273 WO2000007756A1 (fr) 1998-08-05 1999-07-23 Procede et dispositif pour couler une brame a partir de metal liquide

Publications (2)

Publication Number Publication Date
EP1100639A1 true EP1100639A1 (fr) 2001-05-23
EP1100639B1 EP1100639B1 (fr) 2002-11-06

Family

ID=7876582

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99948676A Expired - Lifetime EP1100639B1 (fr) 1998-08-05 1999-07-23 Procede et dispositif pour couler une brame a partir de metal liquide

Country Status (6)

Country Link
US (1) US6505676B1 (fr)
EP (1) EP1100639B1 (fr)
KR (1) KR100621266B1 (fr)
AT (1) ATE227182T1 (fr)
DE (2) DE19835421C2 (fr)
WO (1) WO2000007756A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101837368B (zh) * 2010-04-27 2012-02-01 新星化工冶金材料(深圳)有限公司 镁合金板的连续铸轧成型方法
CN101862819B (zh) * 2010-06-18 2011-05-11 新星化工冶金材料(深圳)有限公司 自动调节液面高度的控制机构及其镁合金板连续铸轧系统

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4597048A (en) * 1983-09-07 1986-06-24 United States Steel Corporation Digital flow regulation of liquid-level control for a continuous casting mold
JPH04339552A (ja) 1991-05-16 1992-11-26 Sumitomo Metal Ind Ltd 連続鋳造機の溶鋼レベル制御方法
CA2094029C (fr) 1991-09-12 1997-04-29 Kazuya Asano Methode de controle du niveau de metal en fusion et dispositif de coulee continue
JPH07232252A (ja) 1993-12-27 1995-09-05 Kawasaki Steel Corp 連続鋳造におけるモールド内溶融金属レベル制御方法
JPH08243703A (ja) * 1995-03-14 1996-09-24 Kawasaki Steel Corp 連続鋳造における湯面レベル制御方法
EP0798061A4 (fr) * 1995-10-18 1999-06-30 Sumitomo Metal Ind Procede de reglage du niveau de metal en fusion dans une machine de coulage continu
DE19633738C5 (de) * 1996-08-22 2006-03-09 Siemens Ag Verfahren und Einrichtung zum Gießen eines Stranges aus flüssigem Metall

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0007756A1 *

Also Published As

Publication number Publication date
DE59903333D1 (de) 2002-12-12
WO2000007756A1 (fr) 2000-02-17
ATE227182T1 (de) 2002-11-15
KR100621266B1 (ko) 2006-09-13
EP1100639B1 (fr) 2002-11-06
DE19835421C2 (de) 2001-11-15
US6505676B1 (en) 2003-01-14
KR20010053632A (ko) 2001-06-25
DE19835421A1 (de) 2000-02-24

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