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WO2002098587A2 - Procede pour ajuster la reduction douce dynamique dans des machines de coulee continue - Google Patents

Procede pour ajuster la reduction douce dynamique dans des machines de coulee continue Download PDF

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Publication number
WO2002098587A2
WO2002098587A2 PCT/EP2002/005768 EP0205768W WO02098587A2 WO 2002098587 A2 WO2002098587 A2 WO 2002098587A2 EP 0205768 W EP0205768 W EP 0205768W WO 02098587 A2 WO02098587 A2 WO 02098587A2
Authority
WO
WIPO (PCT)
Prior art keywords
segment
casting
strand
segments
soft reduction
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.)
Ceased
Application number
PCT/EP2002/005768
Other languages
German (de)
English (en)
Other versions
WO2002098587A3 (fr
Inventor
Udo Falkenreck
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.)
SMS Siemag AG
Original Assignee
SMS Demag 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
Priority claimed from DE10141128A external-priority patent/DE10141128A1/de
Application filed by SMS Demag AG filed Critical SMS Demag AG
Priority to DE50201696T priority Critical patent/DE50201696D1/de
Priority to AU2002344361A priority patent/AU2002344361A1/en
Priority to EP02750980A priority patent/EP1412111B1/fr
Priority to AT02750980T priority patent/ATE283742T1/de
Publication of WO2002098587A2 publication Critical patent/WO2002098587A2/fr
Anticipated expiration legal-status Critical
Publication of WO2002098587A3 publication Critical patent/WO2002098587A3/fr
Ceased 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
    • 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
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/1206—Accessories for subsequent treating or working cast stock in situ for plastic shaping of strands

Definitions

  • the invention relates to a method for setting the dynamic soft reduction in continuous casting plants, in particular in the continuous casting of slabs.
  • a suitable countermeasure is the placement of the strand guide segments below the mold at a certain rate in order to unite strand shells that are growing towards one another. This process is known as soft reduction.
  • the end of a segment is determined by the position of the tangent point of the last roles of the segment; consequently, the start of the next following segment is also set directly behind this pair of roles.
  • the inclination (taper setting) of the upper segment frame is called the taper of the continuous casting machine (CCM). This consists of two sizes: the thermal conicity based on the shrinkage of the casting strand by cooling and solidification, and the soft reduction component, which is set separately. Unless otherwise expressly requested, the latter can also take the size "0".
  • the strand guide consists of 14 segments
  • segments 0 to 7 are clamped to a stop, taking thermal conicity into account
  • segments 8 to 14 are moved to a certain pre-selected jaw width depending on the CCM mode, taking into account the max , Forces that can be introduced into the segment.
  • TTSR thermal tracking calculation
  • liquid fraction is determined via the material data records of the TTSR.
  • the liquid fraction denotes the proportion between liquid and already solidified crystals. The value of this key figure lies between 0 and 1, where 0 is the location of the complete Solidification (Solidus) describes and 1 the position of the liquidus temperature in the strand.
  • TTSR mode The main variables in TTSR mode are:
  • the casting speed Vc the amount of water, the type of steel, the thickness of the strand in the casting machine.
  • the TTSR calculation assumes that the strand shell solidifies symmetrically on the inside and outside radius.
  • the plane of symmetry is half the strand thickness.
  • the level 2 functions for soft reduction can be configured in the following ways:
  • the "Thermal Taper" for the casting machine can be configured using the same mask.
  • Liquid fraction fraction before solidification In total, six different segment positions (quotas with a liquid fraction fraction) are to be entered to influence the top of the swamp.
  • the TTSR value for the liquid fraction calculated from this information indicates the intersection of the liquid fraction portion with the fictitious center line of the strand. This value is measured from the mold level in the mold in the direction of the flame cutting machine. The corresponding strand segment to which the specified quota is applied can then be determined from this parameter.
  • the possibilities for parameterization may result in more than one result for the liquid fraction calculation in a segment. This is particularly likely to happen if the borders are very close to each other.
  • TTSR searches from the point of complete solidification backwards towards the mold for the first intersection with the imaginary center line and determines the segment number.
  • the search algorithm then jumps to the next segment (solid -1) and again determines the first liquid fraction intersection there. This continues until the end.
  • the associated segment employment rates are set in analogy.
  • the TTSR calculation is initiated in a short rhythm of, for example, 10 s, so that the current calculation is then output again.
  • the data from the patterns or their changes accessible to Level 2 are converted into a telegram to Level 1, in which the current quotas for the employment of the segment frames are reported.
  • the maximum permissible change in the quota per cycle was limited to 0.2 mm / m.
  • Level 1 informs every 5 s about the current position of the mouth width of the segment output.
  • the dimension for the mouth width at the segment exit (in level 1) is the same as the dimension for the mouth width at the entrance of the following segment.
  • level 1 is based on the information of the internal width of the outlet dimension of segment 7.
  • the segments in the horizontal part of the casting machine can be adjusted hydraulically to a predetermined size. According to the quotas, the mouth widths are approached by changing the position of the upper frame.
  • the pre The quotas are given by level 2 automation, while the implementation of the mouth widths is regulated by level 1.
  • the regulation of the segment thus works in an operating window, which is determined by the minimum and maximum force, and under all circumstances ensures that the upper frame rests with the appropriate force on the loose side of the slab.
  • the segment that contains the (calculated) solidus point is the last (based on the casting direction) to be assigned a soft reduction rate.
  • the segment After the head has passed, the segment lowers again.
  • the force now pending corresponds to the hot strand pressure.
  • the soft reduction driving style can also be activated after level 1 has been checked for plausibility.
  • segment 8 is gradually lowered to the predetermined soft reduction position.
  • the two hydraulic cylinders at the entry of segment 9 are also lowered with a time delay due to the switching time.
  • the cylinders at the outlet of segment 9 are adjusted together with the cylinders at the inlet of segment 10, taking into account the thermal taper. This process takes place again taking into account the switching cycles between segment 9 end and segment 0 input.
  • TTSR must be based on the comparison with the liquid fraction calculation. decide whether only one segment is required for the soft reduction strategy or whether a second segment is to be charged with the soft reduction rate.
  • the segment 9 is also moved to the soft reduction rate after the liquid fraction has been compared.
  • the following segments must be adjusted in the thermal taper.
  • segment 9 As soon as the swamp tip has penetrated into segment 9 and the defined liquid fraction part has left segment 8, the mouth widths of segment 8 exit together with segment 9 entry are moved into the new position that corresponds to the thermal taper of segment 8 - speaks; this means that segment 9 initially experiences a higher employment rate.
  • the soft reduction rate of segment 9 can be set to the selected value.
  • the position is then retained as a result of the TTSR calculation. This also corresponds to the steady state.
  • the grouping of the segment position is triggered when the switching point is undershot.
  • segment j (old) from which the swamp tip has migrated together with the exit of segment j (new) in which the tip is currently located, is reduced to the internal width dimension that the thermal taper of segment j ( alt) corresponds if you extrapolate the taper position from the CCM end.
  • segment j (new) is now greater than specified.
  • the interface j (new) input and j (new) -1 output must be adapted analogously. This process is repeated until the soft reduction segments cover the entire area again. 5. Several segments receive soft reduction (swamp tip moves towards the mold, the liquid fraction area becomes smaller)
  • the mouth width of the segment must be set to thermal taper that is closest to segment 7.
  • the quota of the segments following towards the end of the CCM will be reset as described in Section 3.
  • segment j with the swamp tip is the last soft reduction segment, a correction will be made in each case via additional soft reduction segments between segment 7 and segment j.
  • the last segment (jn) which is located before the previous soft reduction section, is inserted from the thermal taper setting into the soft reduction taper (mouth width at the segment exit of the newly activated segment jn becomes smaller); at the same time, as already known, the segment (jm) next to jn in the mouth width that is closest to the swamp tip is also set.
  • the mouth width of the segment exit j-m is adjusted according to the soft reduction taper.
  • the segments between j and the end of the caster are adapted to the new slab thickness, taking thermal tapers into account.
  • TTSR first calculates the change in the bottom of the sump and leaves the segment frame as it is switch for a long time until either the sump tip has returned to segment 7 or the extractor has stopped for the flying distributor change.
  • TTSR first calculates the change in the bottom of the sump and lets the segment frames switch until either the bottom of the sump has run back into segment 7 or if the extractor is stopped for slagging. According to the definition, the state now reached is frozen.
  • the soft reduction driving style is switched off when the level 1 tracking system gives the command to lift the upper segment frame.
  • the method described above for setting the dynamic soft reduction can be used not only with conventional slabs, but also with so-called thin slabs.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)

Abstract

L'invention concerne un procédé pour ajuster la réduction douce dynamique dans des installations de coulée continue, notamment lors de la coulée continue de brames. Ce procédé consiste à calculer la position de l'extrémité du cratère liquide, ainsi que les proportions de fractions solides et liquides dans la barre de coulée continue, et à déplacer un ou plusieurs segments de guidage des barres de coulée continue en fonction de la variation de position de l'extrémité du cratère liquide.
PCT/EP2002/005768 2001-06-01 2002-05-25 Procede pour ajuster la reduction douce dynamique dans des machines de coulee continue Ceased WO2002098587A2 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
DE50201696T DE50201696D1 (de) 2001-06-01 2002-05-25 Verfahren zum einstellen der dynamischen soft reduction an stranggiessmaschinen
AU2002344361A AU2002344361A1 (en) 2001-06-01 2002-05-25 Method for adjusting the dynamic soft reduction of continuous casting systems
EP02750980A EP1412111B1 (fr) 2001-06-01 2002-05-25 Procede pour ajuster la reduction douce dynamique dans des machines de coulee continue
AT02750980T ATE283742T1 (de) 2001-06-01 2002-05-25 Verfahren zum einstellen der dynamischen soft reduction an stranggiessmaschinen

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE10126956 2001-06-01
DE10126956.0 2001-06-01
DE10141128A DE10141128A1 (de) 2001-06-01 2001-08-22 Verfahren zum Einstellen der dynamischen Soft Reduction an Stranggießmaschinen
DE10141128.6 2001-08-22

Publications (2)

Publication Number Publication Date
WO2002098587A2 true WO2002098587A2 (fr) 2002-12-12
WO2002098587A3 WO2002098587A3 (fr) 2004-02-19

Family

ID=26009459

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2002/005768 Ceased WO2002098587A2 (fr) 2001-06-01 2002-05-25 Procede pour ajuster la reduction douce dynamique dans des machines de coulee continue

Country Status (4)

Country Link
EP (1) EP1412111B1 (fr)
AT (1) ATE283742T1 (fr)
AU (1) AU2002344361A1 (fr)
WO (1) WO2002098587A2 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003070399A1 (fr) * 2002-02-22 2003-08-28 Sms Demag Aktiengesellschaft Procede et dispositif de coulee continue et de faconnage direct d'un metal, notamment d'une barre de coulee en materiaux a base d'acier
EP2295170A3 (fr) * 2005-07-01 2012-07-04 SMS Siemag Aktiengesellschaft Procédé et dispositif de coulée en continu pour déformer un faisceau coulé à chaud en métal, notamment en acier ou matières dérivées de l'acier
EP1917115B2 (fr) † 2005-11-22 2018-03-14 SMS group GmbH Procede et dispositif de mise en place d'au moins un segment a rouleaux d'un dispositif de guidage de barre sur une barre

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
RU2564192C1 (ru) * 2014-04-02 2015-09-27 Открытое акционерное общество "Уральский завод тяжелого машиностроения" Способ мягкого обжатия непрерывнолитой заготовки

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5160633A (en) * 1974-11-25 1976-05-26 Nippon Kokan Kk Haganeno renzokuchuzoho
JPS57139458A (en) * 1981-02-20 1982-08-28 Nippon Steel Corp Controlling method for perfect solidification position of ingot in continuous casting
DE19931331A1 (de) * 1999-07-07 2001-01-18 Siemens Ag Verfahren und Einrichtung zum Herstellen eines Stranges aus Metall
DE10045250A1 (de) * 2000-09-13 2002-03-21 Sms Demag Ag Verfahren und Einrichtung zum Bestimmen der Lage der Enderstarrung im Gießstrang beim Stranggießen von Metallen, insbesondere von Stahl

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003070399A1 (fr) * 2002-02-22 2003-08-28 Sms Demag Aktiengesellschaft Procede et dispositif de coulee continue et de faconnage direct d'un metal, notamment d'une barre de coulee en materiaux a base d'acier
US7121323B2 (en) 2002-02-22 2006-10-17 Sms Demag Ag Method and device for the continuous casting and direct shaping of a metal strand, in particular a steel cast strand
EP2295170A3 (fr) * 2005-07-01 2012-07-04 SMS Siemag Aktiengesellschaft Procédé et dispositif de coulée en continu pour déformer un faisceau coulé à chaud en métal, notamment en acier ou matières dérivées de l'acier
EP1917115B2 (fr) † 2005-11-22 2018-03-14 SMS group GmbH Procede et dispositif de mise en place d'au moins un segment a rouleaux d'un dispositif de guidage de barre sur une barre

Also Published As

Publication number Publication date
EP1412111B1 (fr) 2004-12-01
ATE283742T1 (de) 2004-12-15
EP1412111A2 (fr) 2004-04-28
AU2002344361A1 (en) 2002-12-16
WO2002098587A3 (fr) 2004-02-19

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