EP2991788A1 - Procédé et dispositif pour réguler la surface de métal liquide dans une lingotière - Google Patents

Procédé et dispositif pour réguler la surface de métal liquide dans une lingotière

Info

Publication number
EP2991788A1
EP2991788A1 EP14726085.5A EP14726085A EP2991788A1 EP 2991788 A1 EP2991788 A1 EP 2991788A1 EP 14726085 A EP14726085 A EP 14726085A EP 2991788 A1 EP2991788 A1 EP 2991788A1
Authority
EP
European Patent Office
Prior art keywords
strand
level
casting
time
mirror
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
EP14726085.5A
Other languages
German (de)
English (en)
Other versions
EP2991788B1 (fr
Inventor
Heinz-Dieter RUMPLER
Robert ZIRKL
Silvio Cecchini
Andreas DISSAUER
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.)
Tbr Casting Technologies GmbH
Original Assignee
Tbr Casting Technologies GmbH
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 Tbr Casting Technologies GmbH filed Critical Tbr Casting Technologies GmbH
Publication of EP2991788A1 publication Critical patent/EP2991788A1/fr
Application granted granted Critical
Publication of EP2991788B1 publication Critical patent/EP2991788B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • 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
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/14—Closures
    • B22D41/16—Closures stopper-rod type, i.e. a stopper-rod being positioned downwardly through the vessel and the metal therein, for selective registry with the pouring opening
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/14—Closures
    • B22D41/22—Closures sliding-gate type, i.e. having a fixed plate and a movable plate in sliding contact with each other for selective registry of their openings

Definitions

  • the invention relates to a method for controlling the liquid metal level in a mold, in particular a continuous casting mold, according to the preamble of claim 1. Furthermore, the invention relates to an apparatus for carrying out the method according to the invention.
  • the level of the mold level in a mold must be kept as constant as possible and variations in the level of the mold level must be avoided to ensure uniform shell growth and the occurrence of strand defects, such as overlaps, inclusions of mold powder, formation of To avoid cracks, etc.
  • this includes: changing the casting speed
  • a change in the casting speed represents a one-time event, which leads to a one-time exceeding the allowable fluctuation range of the G manaptapt level to the desired position and which is compensated by the G manaptregelung with some minor Nachschwankache.
  • a wear of the plug or spout opening leads to a larger flow rate and would result in an increase of the casting level at a constant withdrawal speed.
  • wear ß occurs rather slowly compared to the intervention times of the scheme, so that this effect is generally adjusted continuously without any visible effect on the level of the casting mirror.
  • a narrowing of the spout opening due to "clogging" also does not occur suddenly and is compensated by the mold level control while maintaining the take-off speed by lifting the plug (or opening the spool) the set withdrawal speed of the strand can no longer be maintained. Then the casting speed has to be reduced or in extreme cases the casting process has to be stopped.
  • G intelligentschwankungen can be effected by so-called strand outbookings, known as a "bulging" effect.
  • Strand bulging occurs in particular during casting of so-called slab formats due to the effect of ferrostatic pressure on the strand shell at locations where it is not supported, ie immediately after exit from the mold and between the strand guide rolls or support rolls.
  • strand bulges also called strand pumps
  • the casting level would be uniform if metal is fed into the mold decline. If this strand position then returns to the area of a support roll, the solidified strand shell is compressed, whereby an increase in the casting level would be effected.
  • constant casting speed, constant ferrostatic pressure and constant casting temperature these two effects compensate each other and there is no influence on the pouring level.
  • Critical is the effect of irregular strand bulges or "unsteady bulging”.
  • the volume of the liquid metal within the solidified strand shell changes with uneven strand shell growth.
  • the mold level sinks as it rises as the concave part passes through the area of the support rollers.
  • the thinner the strand shell is on exit from the mold or at the beginning of the secondary cooling zone the more pronounced the effect of strand bulking. This means that a high casting speed and low secondary cooling, apart from the properties of the casting powder used, promote strand bulging.
  • the induced by the irregular Strandausbauchungen G understandapttikschwankept have compared to the usual control fluctuations a long period and are in a time frame of 2.5 seconds. to 25 sec.
  • the present invention is based on the objective of automatically deducing the occurrence of strand bulges from the ongoing analysis of the fluctuations in the levels of the casting mirror detected by the casting level measurement without additional devices on the basis of the number and type of exceeding of defined limit values and their effect to avoid the pouring mirror by an adapted, the normal control process superimposed control algorithm.
  • the amplitude of the G manschwankacheschwankungen is constantly monitored and overruns or falls below an allowable detection limit registered.
  • a detection threshold between ⁇ 3mm and ⁇ 6mm is selected. These values are therefore outside the normal stability during normal casting, where fluctuations of ⁇ 2, Omm are normal.
  • a non-periodic disturbance such as a change in casting speed, may result in exceeding the above limit.
  • the intervals of such disturbances are shorter than those caused by irregular strand bulges and the number of deviations is limited, so that they can be corrected by the standard G manadorregelung in a short time.
  • a fault counter is incremented from zero by the number one whenever the positive or negative detection limit is exceeded. Whenever a count is made, a wait time window with a run time of 1. 0sec. up to 3.0sec. open. A further disturbance count is only made if the wait time has expired and it occurs within a certain time window, which is indicative of the effect of irregular string bulges. This collection time frame within which a count is allowed is up to 30.0sec after the wait time.
  • the setting values of the counter for the detection of "bulging” can be selected with values between 5 and 10, whereby a value of 8 is preferentially selected. If a limit value is exceeded within the waiting time, then no disturbance counting takes place.
  • This function is used to recognize Whether or not a limit value violation is caused by a non-periodic disturbance, in which the period of the oscillations is shorter than that caused by burst bulges, and only if another disturbance occurs up to 30 seconds after the expiry of the waiting time is it counted and the time slots for the waiting time and the acquisition time are reset and start to run again.
  • a deactivation time window is also opened whose period of time is equal to that of the acquisition time frame. If no further fault occurs within this period, all time windows and the fault counter are reset.
  • the timers are reset and on the other hand the fault is registered until the fault counter reaches the set value between 5 and 10.
  • the counter is set to 0 (zero) and the time window is set to its initial position, ie also 0 (zero). Only after registering a new fault, the time windows are reactivated and the counting process begins again.
  • the present invention is therefore a method by which increased G manschwankonne Heidelbergschwankache attributed to irregular strand bulges ("unsteady bulging") are clearly recognized as such without the use of additional measuring equipment and against other G manadorschwankept, as for example by a change in the Characteristic features are the acquisition and registration of additional parameters from the existing measurement and control system such as a fault count, by each of which a first following disturbance, the one, within the limits of detects a positive or negative overshoot detection limit set at least ⁇ 3mm to within ⁇ 6mm of the target level of the water level, then increments by 1 if and after a waiting time selected in the range of 1, 0sec to 3.0sec and before expiration of a starting after the end of the waiting time selectable detection period to 30,0sec.
  • Detection system will not detect unacceptable bilge disturbances due to irregular strand bulge - no further action
  • FIGS. 1 to 6 illustrate the principles of the present invention.
  • FIG. 1 shows schematically the structure of a continuous slab caster. From a distribution vessel, not shown, the liquid steel 1 passes through a spout opening 2 with dip tube in the continuous casting mold 3, wherein the metal inflow is controlled by a plug 4 so that the casting level 5 approximately in accordance with the withdrawal speed V caused by the driver rollers not shown here is kept constant. Furthermore, FIG. 1 shows the guided by support rollers 6 strand, which is formed in this area of the fixed strand shell 7 and the existing of liquid steel 1 core.
  • the growth of the initial strand shell is not uniform, but may be different depending on the contact with the mold wall, the effect of the secondary cooling, etc.
  • FIG. 4 schematically illustrates the behavior of the casting mirror 5 over time when irregular bulges 8 occur using the measurement and control method according to the invention.
  • the standard controller keeps the level of the pouring mirror 5 within a range of ⁇ 1 mm to ⁇ 3 mm.
  • the standard controller can not control the pouring mirror fluctuations, so that they build up and ultimately exceed the upper and / or lower detection limit.
  • Fig. 5 summarizes the basics of the invention detection of irregular bulges 8 from the behavior of the Cast Mirrors 5.
  • the requirement for registration as an irregular bulge 8 is that the level of the pouring mirror 5 is between 5 times and 10 times, typically 8 times the set detection or detection limits, each within a selected detection time frame of up to 30.0 seconds after a waiting time of 1, 0sec- 3.0sec. exceeds.
  • FIG. 6 shows a block diagram of how the adaptation according to the invention of the controller software of a mold level control 10 and of a control algorithm 1 according to the invention adapted to leveling irregularities caused by irregular bulges 8 are compensated.
  • the signal coming from the mold level gauge 9 is analyzed in the "Bulging" detection block 12, as shown in Fig. 4 and Fig. 5. If no disturbance is detected, the controller continues to operate in the standard pouring mode mode If the occurrence of "bulging" can be recognized, the control algorithm 1 1 is changed to an increased intervention, so that these stronger and occurring at longer intervals disturbances are compensated by appropriate influence on the position of the plug 4.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Non-Electrical Variables (AREA)
  • Continuous Casting (AREA)

Abstract

L'invention concerne un procédé et un dispositif pour réguler la surface de métal liquide dans une lingotière. Par analyse du signal obtenu lors de la mesure d'une surface du bain (5), l'apparition de renflements (8) de la barre de coulée est détectée et un mouvement du bouchoir renforcé et adapté est suscité par activation d'un algorithme de contrôle supplémentaire dans la régulation (10) de la surface du bain de sorte que des fluctuations de la surface du bain (5) peuvent ainsi être maintenues autour du niveau de consigne dans une plage prédéfinie de ± 1,0 bis ± 3,0 mm.
EP14726085.5A 2013-05-03 2014-04-30 Procédé et dispositif pour réguler la surface de métal liquide dans une lingotière Not-in-force EP2991788B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT3702013A AT514734A1 (de) 2013-05-03 2013-05-03 Verfahren und Vorrichtung zur Regelung des Flüssigmetallspiegels in einer Stranggießkokille
PCT/EP2014/058802 WO2014177605A1 (fr) 2013-05-03 2014-04-30 Procédé et dispositif pour réguler la surface de métal liquide dans une lingotière

Publications (2)

Publication Number Publication Date
EP2991788A1 true EP2991788A1 (fr) 2016-03-09
EP2991788B1 EP2991788B1 (fr) 2019-04-03

Family

ID=50792412

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14726085.5A Not-in-force EP2991788B1 (fr) 2013-05-03 2014-04-30 Procédé et dispositif pour réguler la surface de métal liquide dans une lingotière

Country Status (3)

Country Link
EP (1) EP2991788B1 (fr)
AT (1) AT514734A1 (fr)
WO (1) WO2014177605A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT519390B1 (de) * 2016-12-13 2020-09-15 Primetals Technologies Austria GmbH Verfahren und Vorrichtung zum Regeln einer Stranggießanlage
DE102018203666A1 (de) * 2018-03-12 2019-09-12 Sms Group Gmbh Verfahren zur Vermeidung von Gießspiegelschwankungen während einer Gießsequenz
CN113263170A (zh) * 2021-05-13 2021-08-17 马鞍山钢铁股份有限公司 一种连铸机定径水口浇注断流补救漏钢方法

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5311924A (en) * 1991-09-12 1994-05-17 Kawasaki Steel Corporation Molten metal level control method and device for continuous casting
JP3318742B2 (ja) * 1999-01-14 2002-08-26 住友重機械工業株式会社 連続鋳造設備のモールド湯面制御装置
EP1097765A4 (fr) * 1999-04-28 2005-02-09 Sumitomo Metal Ind Regulation du niveau de la surface du metal dans un moule en moulage continu
JP2006088212A (ja) * 2004-09-27 2006-04-06 Jfe Steel Kk 連続鋳造における湯面レベル制御方法
AT502525B1 (de) * 2005-10-12 2008-05-15 Voest Alpine Ind Anlagen Verfahren zum stranggiessen einer metallschmelze

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2014177605A1 *

Also Published As

Publication number Publication date
WO2014177605A1 (fr) 2014-11-06
AT514734A1 (de) 2015-03-15
EP2991788B1 (fr) 2019-04-03

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