EP0116030A2 - Procédé de contrôle d'une machine de coulée continue courbe - Google Patents

Procédé de contrôle d'une machine de coulée continue courbe Download PDF

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Publication number
EP0116030A2
EP0116030A2 EP84890003A EP84890003A EP0116030A2 EP 0116030 A2 EP0116030 A2 EP 0116030A2 EP 84890003 A EP84890003 A EP 84890003A EP 84890003 A EP84890003 A EP 84890003A EP 0116030 A2 EP0116030 A2 EP 0116030A2
Authority
EP
European Patent Office
Prior art keywords
pull
strand
out speed
stiffness
permissible
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
EP84890003A
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German (de)
English (en)
Other versions
EP0116030A3 (en
EP0116030B1 (fr
Inventor
Aktiengesellschaf Voest-Alpine
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.)
Voestalpine AG
Original Assignee
Voestalpine 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 Voestalpine AG filed Critical Voestalpine AG
Publication of EP0116030A2 publication Critical patent/EP0116030A2/fr
Publication of EP0116030A3 publication Critical patent/EP0116030A3/de
Application granted granted Critical
Publication of EP0116030B1 publication Critical patent/EP0116030B1/fr
Expired 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
    • B22D11/20—Controlling or regulating processes or operations for removing cast stock

Definitions

  • the invention relates to a method for monitoring a continuous sheet caster, in particular a steel continuous caster, in which a strand emerging from the strand guide is straightened in a straightening unit.
  • continuous sheet casting systems in which the strand is cast in an arc mold and straightened after deflection into the horizontal in a straightening unit
  • continuous sheet casting systems in which the strand is cast in a straight mold, deflected into a circular arc path in a bending unit and after deflecting into the horizontal is straightened in a straightening unit.
  • Both types can experience line standstills due to malfunctions, i.e. the line remains in the system for a short time until the malfunctions have been remedied.
  • strand pull-out speed (casting speed)
  • strand pull-out speed for example if you want to change the strand cross-sectional format without interrupting the casting.
  • Such strand stoppages or reductions in the strand pull-out speed cause the strand to solidify within the system, so that increased bending or straightening forces are required for bending or straightening the strand as a result of its increased rigidity.
  • the invention aims to avoid these disadvantages and difficulties and has as its object to provide a method for monitoring a continuous sheet casting installation by which the pulling of an excessively cooled strand from the installation can be prevented or recognized in good time or by which it is possible, To avoid excessive cooling of the strand within the curved strand guide, so that damage to the system caused thereby can be reliably avoided.
  • This object is achieved according to the invention in that, depending on the process parameters influencing the rigidity of the strand on its way from the mold to the end of the straightening unit, such as the strand pull-out speed, the permitted remaining pull-out time or the still permitted maximum downtime or the still permitted minimum Pull-out speed of the line is determined and if the remaining pull-out time or the maximum permissible standstill time is exceeded or if the pull-out speed falls below the minimum pull-out speed, an alarm signal is given and / or corrective action is taken in the control of the system, etc. either by increasing the pull-out speed or by aborting the casting.
  • the "history" of the strand is thus used to monitor the continuous sheet casting installation.
  • a value is preferably assigned to each strand cross-sectional element at a certain distance from the mold level, the size of which corresponds approximately to the rigidity of the element and the determination of which is primarily based on the pull-out speed (s) of the cross-sectional element on its way from the mold level to the specific distance from the mold level the value thus determined for each element is compared with a permissible limit value dependent on the current casting speed, and from the positive differences between the limit values and the determined values, the minimum positive difference is used as a determining factor for the maximum permissible remaining pull-out time.
  • each strand cross-sectional element is assigned a permissible limit value for the stiffness depending on the position it currently occupies, and the determined value of the stiffness of each element is compared with the associated permitted limit value and from all positive differences between the respective limit values and the minimum positive difference is selected from the determined values and used as a determining factor for the still permissible maximum downtime.
  • a value is advantageously assigned to each strand cross-sectional element at a certain distance from the mold level, the size of which corresponds approximately to the stiffness of the element and for its determination primarily the pull-out speed (s) of the cross-sectional element on its way from the mold level to the specific one If the distance from the mold level is used, an increase in stiffness is determined based on the value determined for each element, which on the way of the element from its current distance from the mold level to the end of the straightening unit results in a stiffness value that is just below all the maximum permissible limit values, and this increase in stiffness is used as a determining factor for a pull-out speed of each element and the maximum pull-out speed of these pull-out speeds determined as the still allowable minimum pull-out speed.
  • the cooling conditions are used to determine the rigidity of each element, as a result of which the determined rigidity of the strand elements corresponds particularly precisely to the actual conditions.
  • a particularly precise method is characterized in that, in addition to the pull-out speed, the strand cross-sectional format is used to determine the rigidity of each element, the strand quality also being expediently taken into account.
  • the straightening unit is designed for significantly higher loads than the bending unit and the circular arc-shaped strand guide arranged between these units.
  • Fig. 1 shows a schematic representation of a continuous sheet caster
  • 2 and 3 show diagrams in which the rigidity of the strand as a function of the distance from the mold level is illustrated.
  • a pan denotes a pan arranged above an intermediate vessel 2, from which molten steel flows into the intermediate vessel 2.
  • the steel melt flows from the intermediate vessel 2 into a water-cooled straight mold 3.
  • a bending unit 4 is provided below the mold, which is followed by an arcuate strand guide 5.
  • a straightening unit 6 is provided, which is followed by a run-out roller table (not shown) with a flame cutting device.
  • a process computer is designated 10.
  • the stiffness 15 of the strand 9 is also entered as a function of the distance from the casting level, as occurs at a certain time during casting.
  • This function thus corresponds to the current stiffness curve at a specific moment and thus represents a kind of "snapshot" of the stiffness of the strand.
  • This "snapshot” can be obtained by dividing the strand 9 into strand cross-sectional elements, which in FIG. 2 are a to n are designated.
  • each of these elements a to n is assigned a rigidity that takes into account the "history" of the strand, ie each element is assigned due to the "events” that occur on the way from the mold level 13 to the respective position of the element (maximum to End 14 of the straightening unit 6) have experienced a rigidity assigned.
  • the standstill times of the strand, the pull-out that occurred in each case speeds v and possibly changing cooling conditions (for example the amount of coolant with which each element was acted upon on its way from the casting level 13 to the momentary system of the respective element) or the cross-sectional format of the strand and / or the strand quality.
  • the temperature of the melt or the strand surface can also be taken into account.
  • the “history” of the increase in stiffness of the nth element is shown in FIG. 2 with dashed lines 16, the increase in stiffness depending on the path sections along which the element n was moved at a constant pull-out speed, in a good approximation of the actual increase in stiffness the straight lines 16 ', 16 ", 16"', 16 “” are illustrated.
  • the element n was first pulled out at a uniform speed v 1 (straight line 16 '), followed by a standstill v (straight line 16 "), whereupon the element again with a constant pulling speed v 2 ( Just 16 “') was moved further, the speed v 2 being greater than the speed v 1 , as can be seen from the lower inclination of the straight line 16"'.
  • the element n (and thus all the other elements of the strand) was included greatly reduced pull-out speed v 3 , as can be seen from the more inclined straight line 16 "" of the course 16 of the "history" of the nth element.
  • the "history" of the kth element is also shown with dash-dotted lines 17 that corresponds to the last part of the "history" of the nth element.
  • Fig. 2 Also shown in Fig. 2 is the increase in stiffness 18 of the nth element when the strand is pulled out by the distance between the individual elements, i.e. the nth element, which was initially at the position of the element n-1, experienced an increase in stiffness 18 during the further extension on the way from the position of the (n-1) element to the end of the straightening unit 18. Approximately, it can be assumed are that all elements have experienced approximately the same increase in stiffness 18 during this last pull-out step, that is to say also elements a and k.
  • This straight line 19 thus illustrates the minimum permissible rigidity.
  • the rigidity increases only slightly due to the increased cooling water supply (the cooling water is specified with the aid of a process computer), so that approximately the same rigidity increase is always assumed for extension speeds greater than v limit.
  • the stiffness to be expected for the future period (which the element will need to cover the remaining distance to the end of the straightening unit) is calculated and this stiffness to be expected compared with the maximum permissible stiffnesses 11, 12 If one of the elements on its way to the end 14 of the straightening unit 6 is assigned a higher rigidity than this at any point on the path still to be covered Point of the path due to the limit curves 11, 12 is associated, is giveaeben either an alarm signal or will egriffen corrective mono- q in the control of the Anlaae. This can be done, for example, by either increasing the pull-out speed or stopping the casting.
  • Fig. 1 From Fig. 1 it can be seen that from the process computer 10 control lines 20, 21, 22 to a ladle slide 23 for setting or closing the same, to a distributor plug 24 for setting or closing the same and to a line control unit 25 for setting a specific line pull-out speed . Another line 26 leads to an alarm system 27.
  • the maximum permissible limit values 11, 12 of the stiffness, the measured value of the current casting speed or pull-out speed, as well as information about the steel quality and the strand cross-sectional format and, if appropriate, about the cooling via input lines 28 are fed into the process computer 10.
  • the calculation of the rigidity of the individual strand elements can be adapted to the current conditions of the casting process on the basis of the current measurement data acquisition.
  • Fig. 3 in a manner analogous to Fig. 2, it is shown in a graphical representation that for the elements a to 1 and the element p with the current pull-out speed v, no more sufficiency can be found by the increase in stiffness as it continues with pouring the current casting speed is to be expected (and which is illustrated by the dashed straight lines 29, 30), drawn from these elements in the diagram. It can be seen that the straight lines 29, 30 which are formed by elements a to 1 and by element p
  • the differences between the current stiffness values of the elements a to n and the current locally associated limit values 11, 12 are formed and from these differences (in FIG. 3, one of these differences for the element q is denoted by 33).
  • the increase in stiffness (dash-dotted line 35) for the element q is shown in FIG. 3 for casting with a minimum permissible pull-out speed v min .
  • This element q represents the critical element in the instantaneous recording of the stiffness values of the elements shown in FIG. 3, ie the minimum pull-out speed v min must be based on this element, all other elements would allow a lower pull-out speed and thus a higher specific increase in stiffness.
  • curves 29, 30 and 35 are used instead of straight lines.
  • Another advantage of the method according to the invention can be seen in the fact that, on the basis of the stiffness values achieved by the individual elements a to n in the individual zones of the strand guide or the maximum stiffness values that occur, statistics about the load on the continuous casting installation or the elements of the strand guide are created can be determined based on the overhaul times of the system.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
EP84890003A 1983-01-11 1984-01-05 Procédé de contrôle d'une machine de coulée continue courbe Expired EP0116030B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT0007483A AT378707B (de) 1983-01-11 1983-01-11 Verfahren zum ueberwachen einer bogenstranggiessanlage
AT74/83 1983-01-11

Publications (3)

Publication Number Publication Date
EP0116030A2 true EP0116030A2 (fr) 1984-08-15
EP0116030A3 EP0116030A3 (en) 1985-09-11
EP0116030B1 EP0116030B1 (fr) 1988-03-16

Family

ID=3480843

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84890003A Expired EP0116030B1 (fr) 1983-01-11 1984-01-05 Procédé de contrôle d'une machine de coulée continue courbe

Country Status (6)

Country Link
US (1) US4588020A (fr)
EP (1) EP0116030B1 (fr)
JP (1) JPS59133960A (fr)
AT (1) AT378707B (fr)
CA (1) CA1196766A (fr)
DE (1) DE3469855D1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0234491A2 (fr) * 1986-02-27 1987-09-02 Sms Schloemann-Siemag Aktiengesellschaft Procédé pour terminer l'opération de coulée dans une installation de coulée de bandes d'acier
DE4210495C1 (fr) * 1992-03-31 1993-04-15 Ibvt Ingenieurbuero Fuer Verfahrenstechnik Gmbh, 4000 Duesseldorf, De

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT403351B (de) * 1993-05-19 1998-01-26 Voest Alpine Ind Anlagen Verfahren zum stranggiessen eines metallstranges
DE19838774A1 (de) * 1998-08-26 2000-03-02 Schloemann Siemag Ag Strangabzugsverfahren und hiermit korrespondierende Bogenstranggießanlage
DE19841116A1 (de) * 1998-09-09 2000-03-16 Km Europa Metal Ag Verfahren zum Betreiben einer Horizontal-Bandgießanlage und Horizontal-Bandgießanlage zur Durchführung des Verfahrens
DE102009031651A1 (de) * 2009-07-03 2011-01-05 Sms Siemag Aktiengesellschaft Verfahren zum Bestimmen der Lage der Sumpfspitze eines gegossenen Metallstrangs und Stranggießanlage

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2150420A1 (fr) * 1971-08-24 1973-04-06 Uss Eng & Consult
DE2444443A1 (de) * 1973-09-17 1975-03-20 Nippon Kokan Kk Verfahren zum stranggiessen einer stahlschmelze

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT234294B (de) * 1961-11-04 1964-06-25 Concast Ag Verfahren und Vorrichtung zum Stranggießen
US3358743A (en) * 1964-10-08 1967-12-19 Bunker Ramo Continuous casting system
US3478808A (en) * 1964-10-08 1969-11-18 Bunker Ramo Method of continuously casting steel
US3614978A (en) * 1968-07-01 1971-10-26 Westinghouse Electric Corp Computerized continuous casting system control responsive to strand position
US3842894A (en) * 1973-01-17 1974-10-22 American Metal Climax Inc Automatic means for remote sweep-scanning of a liquid level and for controlling flow to maintain such level
CH630821A5 (de) * 1978-08-11 1982-07-15 Concast Ag Verfahren zur vermeidung von beschaedigungen an strangfuehrungselementen einer stranggiessanlage fuer stahl.
FR2477925A1 (fr) * 1980-03-13 1981-09-18 Fives Cail Babcock Procede de controle du refroidissement du produit coule dans une installation de coulee continue

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2150420A1 (fr) * 1971-08-24 1973-04-06 Uss Eng & Consult
DE2444443A1 (de) * 1973-09-17 1975-03-20 Nippon Kokan Kk Verfahren zum stranggiessen einer stahlschmelze

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0234491A2 (fr) * 1986-02-27 1987-09-02 Sms Schloemann-Siemag Aktiengesellschaft Procédé pour terminer l'opération de coulée dans une installation de coulée de bandes d'acier
EP0234491A3 (en) * 1986-02-27 1988-01-07 Sms Schloemann-Siemag Aktiengesellschaft Method of terminating the casting operation in a steel strip casting plant
DE4210495C1 (fr) * 1992-03-31 1993-04-15 Ibvt Ingenieurbuero Fuer Verfahrenstechnik Gmbh, 4000 Duesseldorf, De
EP0563786A1 (fr) * 1992-03-31 1993-10-06 IBVT INGENIEURBÜRO FÜR VERFAHRENSTECHNIK GmbH Procédé de coulée continue du type courbe d'acier hautement allié
US5454417A (en) * 1992-03-31 1995-10-03 IBVT Ingenieurburo f. Verfahrenstechnik GmbH Method for casting steels in arcuate continuous casting installations

Also Published As

Publication number Publication date
EP0116030A3 (en) 1985-09-11
CA1196766A (fr) 1985-11-19
US4588020A (en) 1986-05-13
DE3469855D1 (en) 1988-04-21
JPS59133960A (ja) 1984-08-01
AT378707B (de) 1985-09-25
ATA7483A (de) 1985-02-15
EP0116030B1 (fr) 1988-03-16

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