EP2229249B1 - Stranggiessanlage mit einer vorrichtung zur bestimmung von erstarrungszuständen eines giessstrangs und verfahren hierfür - Google Patents

Stranggiessanlage mit einer vorrichtung zur bestimmung von erstarrungszuständen eines giessstrangs und verfahren hierfür Download PDF

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Publication number
EP2229249B1
EP2229249B1 EP08868178.8A EP08868178A EP2229249B1 EP 2229249 B1 EP2229249 B1 EP 2229249B1 EP 08868178 A EP08868178 A EP 08868178A EP 2229249 B1 EP2229249 B1 EP 2229249B1
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EP
European Patent Office
Prior art keywords
region
strip
solidification
cast
bearing
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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.)
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EP08868178.8A
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German (de)
English (en)
French (fr)
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EP2229249A1 (de
Inventor
Ina HÜLLEN
Andreas Runge
Holger Beyer-Steinhauer
Markus Reifferscheid
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SMS Siemag AG
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SMS Siemag AG
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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
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/128—Accessories for subsequent treating or working cast stock in situ for removing
    • 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

Definitions

  • the invention relates to a method for determining solidification states of a cast strand in a continuous casting plant.
  • Continuous casting plants are well known in the art. Such continuous casting plants for casting liquid metal have, after the mold, typically a support roll stand with strand guide segments for the cast strand.
  • the knowledge of the solidification length of the cast strand is of particular importance.
  • the solidification length or the point of complete solidification of the strand is a parameter for operating the continuous casting plant.
  • the point of solidification or the solidification length corresponds to a point with a fixed portion of the cast strand of 100%, which means that in the core of the cast strand no liquid or doughy material is no longer present.
  • the knowledge about the degree of solidification of the strand is less than 100% of interest for strand guidance and strand cooling.
  • Continuous casting plants are known in the prior art in which the solidification length is achieved by measuring the displaceable amount of the core liquid volume per unit length and building on these measured values Model calculation is performed for the instantaneous length of the sump tip.
  • Such a continuous casting plant is known by the WO 2005/068109 A1 ,
  • the disclosure EP 1 193 007 A1 a method for determining the position of the final solidification in the cast strand, wherein support segments are provided and for determining the position of the final solidification at least in one of the support segments, the pullout tensile force of the tension rollers and / or the clamping force of the hydraulic piston-cylinder units of the support segments is measured and from the Measured values of the area of the sump tip is determined.
  • the object is achieved by a method comprising the features of claim 1.
  • this takes place in a continuous casting plant with a device for determining solidification states of the casting strand with a strand guide with continuous casting segments with rollers, in which at least one of the continuous casting segments is designed as a measuring segment, wherein at least one or more measuring points for direct or indirect determination of one or more Roll acting force is provided, further wherein the at least one measuring point is preferably arranged on a bearing block between a bearing and the segment frame of the strand segment and a data processing unit is provided which determines the solidification states of the cast strand based on the data of the at least one measuring point.
  • At least one of the continuous casting segments is designed as a measuring segment, wherein at least one measuring point or several measuring points for direct or indirect determination of the force acting on one or more rollers is provided, wherein furthermore the at least one measuring point on a bearing block preferably between a bearing and the segment frame the continuous casting segment is arranged which detects a quantity representing a force and a data processing unit is provided which determines the solidification states of the cast strand on the basis of the data of the at least one measuring point.
  • the measuring point is provided on at least one bearing block of a center bearing or more central bearings. It is also expedient if the measuring point is provided on a bearing block on the fixed side and / or on the loose side of a roller. Also can be advantageous Are provided plurality of measuring points within the strand guide, which are interconnected. In this case, the connection can advantageously be made by the data processing unit to a measuring system.
  • center bearings are designed by single or multiple shared roles as measuring points.
  • the data processing unit determines level differences of the measured variable by means of analytical, statistical evaluation methods and derives therefrom a solidification state.
  • the determination of the solidification state takes place by assigning a solidification state to a characteristic measured variable.
  • a characteristic measured variable is a bearing force or a bearing deformation.
  • a scattering of a characteristic measured variable is the scattering of a bearing force or a bearing deformation.
  • the data processing unit evaluates the measured variable by means of fast Fourier analysis or other statistical evaluation methods and thus determines the apparatus influences on the measured variable.
  • the FIG. 1 schematically shows a representation of a cast strand 10 with different solidification states.
  • the casting strand 10 is guided by a plurality of strand guiding elements 1.
  • the strand guide elements 1 castors 2 rolls, which are mounted by means of roller bearings 3.
  • four segments 1 are shown, each having five pairs of rollers 2.
  • the cast strand 10 is guided by the rollers.
  • the cast strand 10 is in a solidification state which has a degree of solidification of less than 20 to 30%. This means that a liquid or doughy fraction 6 of 80 to 70% is present.
  • the Gleßstrang 10 is in a solidification state, which has a solidification degree with a solid content 5 of 20 to 80%.
  • the Gleßstrang 10 is in a solidification state, which has a solidification rate with a solids content of 70 to 80% to less than 100%.
  • there is correspondingly a solidification state of 100%. The sump tip 4 is thus in the last area IV.
  • the measured variable representing the roller force lies in a central region in the first region.
  • the scatter this measure is at a low level.
  • both the measured variable and its scattering are at a high level.
  • the measured value is at a low level, but the spread of the measured variable is at a medium level.
  • Region I corresponds to the liquid phase of the strand with a liquid core.
  • the liquid phase lying at a higher level in the Tell area is burdened by upstream parts of the strand on the strand shell and pushes them from the inside to the outside.
  • This ferrostatic must therefore be absorbed by the bearing forces.
  • the force is increased in comparison to the solidified state, which means that the measured value representing the force is at an average level.
  • the soft strand dampens well so that the standard deviation of the measurand representing the force is small.
  • This first region I ends depending on the steel grade in the range of 20 to 30% solids.
  • the region II represents a transition region in which the force level or the level of the measured variable representing the force is at a higher level than in the region I.
  • This area has a solidification state of 30 to 70%.
  • the strand 10 also has a liquid core with a solid outer region. In addition to the ferrostatic, a proportion of the strand deformation is added. The attenuation of the strand is lower, so that the variance of the force or the force representing the measured variable than in the area I is.
  • the region III represents a virtually solidified region, in which the force level or the level of the force representing the measured variable perpendicular to the casting direction is low. In this area III only parts of the weight and pull-out force act. The scattering or the standard deviation is high due to the low attenuation of the quasi-solidified strand. In this state, although still present melt, but separated by bridges and so there is no continuous steel column,
  • Region IV is the solidified region in which there are substantially the same force and variance ratios as in region III.
  • the FIG. 2 shows a diagram in which measurement results are shown, which were obtained at a measuring point which is arranged on a segment of a continuous casting plant.
  • different measuring points are not arranged at different segments in this example, but measuring points are used on a segment and the solidification ranges move through the measuring points.
  • two measuring points are arranged on a fixed and a floating bearing of a roller bearing.
  • the FIG. 2 shows in the lower area with the lower two curves the measured values of a measuring gap representing a force. In this case, a change in the signal representing the force can be detected, and as a result an assignment to the status areas I to III can be made, as explained above.
  • the top curve shows the casting speed as a function of time.
  • the position of the sump tip or the boundaries between the state areas shifts.
  • the state area I with a high liquid content is located at the measuring point.
  • the status area II with a medium liquid content is located at the measuring point.
  • the state area III is located at the measuring point.
  • FIG. 3 schematically shows a continuous caster 20 with a casting strand 21 and shown with six segments 22 to 27.
  • the sump tip would be found in the region of the last or possibly also penultimate segment when the casting speed is high. So it may well happen that at high casting speeds of greater than 6 m / min, such as 7 m / min, the sump tip in the last, sixth segment 27 is located.
  • measuring points for example, rollers or roller bearings can be selected, with quite a measuring point on a floating bearing and / or on a fixed bearing a role is selectable.
  • the solidification states can be detected.
  • the sump tip is then, for example, in the sixth segment 26, the hitherto last segment.
  • a bearing force measurement is performed.
  • the bearing force measurement via an inductive distance measurement, for example in bearing blocks 30, see FIG. 4 .
  • the measuring bearing blocks 30 are slotted horizontally below the bearing shells 33 by means of slot 32 and equipped with an inductive distance sensor 34.
  • the change in the slot height of the slot 34 behaves approximately proportional to the applied force.
  • the measuring bearings 30 are installed, for example, in the center bearings of long sub-rollers 2 and 7 of the segments 24 and 25 on the fixed side and / or on the Losselte. In this way, the bearing force is determined at 2 x 4 points over the system length.
  • FIG. 4 shows the bearing block 30 of a split Mlttenlagers slotted below the bearing shell, which causes a defined bearing weakening.
  • the position and the geometry of the gap are preferably designed so that at a maximum load advantageous maximum deflection the gap top and no plastic deformation occurs.
  • the distance sensor 34 is inserted centrally from the bearing foot 35 through a bore 36 into the bearing block 30 and protrudes advantageously into the measuring gap 32.
  • the slot 32 is thus designed such that due to the applied force through the cast strand, a local deformation occurs that can be detected. In this regard, let's look at the older one DE 10 2006 027 066 verwlesen.
  • the data processing unit 38 can be seen, which receives data from the sensors (34) of the measuring points and determines the solidification states.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
EP08868178.8A 2007-12-28 2008-12-23 Stranggiessanlage mit einer vorrichtung zur bestimmung von erstarrungszuständen eines giessstrangs und verfahren hierfür Active EP2229249B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102007063098 2007-12-28
DE102008014524A DE102008014524A1 (de) 2007-12-28 2008-03-15 Stranggießanlage mit einer Vorrichtung zur Bestimmung von Erstarrungszuständen eines Gießstrangs und Verfahren hierfür
PCT/EP2008/011069 WO2009083231A1 (de) 2007-12-28 2008-12-23 Stranggiessanlage mit einer vorrichtung zur bestimmung von erstarrungszuständen eines giessstrangs und verfahren hierfür

Publications (2)

Publication Number Publication Date
EP2229249A1 EP2229249A1 (de) 2010-09-22
EP2229249B1 true EP2229249B1 (de) 2014-04-02

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EP08868178.8A Active EP2229249B1 (de) 2007-12-28 2008-12-23 Stranggiessanlage mit einer vorrichtung zur bestimmung von erstarrungszuständen eines giessstrangs und verfahren hierfür

Country Status (12)

Country Link
US (1) US8336602B2 (zh)
EP (1) EP2229249B1 (zh)
JP (1) JP5465675B2 (zh)
KR (1) KR20100087764A (zh)
CN (1) CN101932396B (zh)
CA (1) CA2710544C (zh)
DE (1) DE102008014524A1 (zh)
RU (1) RU2471590C2 (zh)
TW (1) TWI478780B (zh)
UA (1) UA95046C2 (zh)
WO (1) WO2009083231A1 (zh)
ZA (1) ZA201003947B (zh)

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DE102009031651A1 (de) * 2009-07-03 2011-01-05 Sms Siemag Aktiengesellschaft Verfahren zum Bestimmen der Lage der Sumpfspitze eines gegossenen Metallstrangs und Stranggießanlage
CN101912952B (zh) * 2010-08-27 2013-07-17 田陆 动态轻压下的控制方法和压下区间的确定方法
JP5835574B2 (ja) * 2011-12-15 2015-12-24 Ｊｆｅスチール株式会社 連続鋳造における鋳造鋳片の凝固完了位置検出方法および凝固完了位置制御方法
KR101736574B1 (ko) * 2015-06-04 2017-05-17 주식회사 포스코 응고 장치
BR112018015432A2 (pt) * 2016-02-02 2018-12-18 Nippon Steel & Sumitomo Metal Corporation equipamento de detecção de empenamento de placa e método de detecção de empenamento de placa
US10888920B2 (en) * 2016-12-08 2021-01-12 Aktiebolaget Skf Monitoring and control system for continuous casting machine

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Also Published As

Publication number Publication date
RU2010131613A (ru) 2012-02-10
TW200934597A (en) 2009-08-16
TWI478780B (zh) 2015-04-01
CN101932396A (zh) 2010-12-29
RU2471590C2 (ru) 2013-01-10
DE102008014524A1 (de) 2009-07-02
UA95046C2 (uk) 2011-06-25
KR20100087764A (ko) 2010-08-05
US8336602B2 (en) 2012-12-25
WO2009083231A1 (de) 2009-07-09
US20100319873A1 (en) 2010-12-23
CA2710544C (en) 2012-12-18
CA2710544A1 (en) 2009-07-09
EP2229249A1 (de) 2010-09-22
CN101932396B (zh) 2014-12-24
JP5465675B2 (ja) 2014-04-09
ZA201003947B (en) 2011-03-30
JP2011506101A (ja) 2011-03-03

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