EP2448695A1 - Verfahren zum bestimmen der lage der sumpfspitze eines gegossenen metallstrangs und stranggiessanlage - Google Patents
Verfahren zum bestimmen der lage der sumpfspitze eines gegossenen metallstrangs und stranggiessanlageInfo
- Publication number
- EP2448695A1 EP2448695A1 EP10732652A EP10732652A EP2448695A1 EP 2448695 A1 EP2448695 A1 EP 2448695A1 EP 10732652 A EP10732652 A EP 10732652A EP 10732652 A EP10732652 A EP 10732652A EP 2448695 A1 EP2448695 A1 EP 2448695A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- segment
- roller
- rollers
- measuring
- metal strand
- 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
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
- B22D11/128—Accessories for subsequent treating or working cast stock in situ for removing
- B22D11/1285—Segment changing devices for supporting or guiding frames
-
- 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
- B22D11/207—Controlling or regulating processes or operations for removing cast stock responsive to thickness of solidified shell
Definitions
- the invention relates to a method for determining the position of the sump tip of a cast metal strand in a continuous casting plant comprising a support roll stand of successive casting segments in the casting direction, each roll segment comprising a segment subframe having a number of rolls and a segmental upper frame having a plurality of rolls, wherein the rolls of the segment subframe and the rollers of the segment upper frame for defining a lower and upper pass line for the metal strand are set to a predetermined distance.
- the invention relates to a continuous casting plant. In order to be able to optimally operate the continuous casting process of the type mentioned, it is necessary to know the position of the sump tip of the cast metal strand. In the prior art, there are various ways that one can determine this location.
- WO 2007/115744 A1 describes a method for determining the position of the sump tip during continuous casting, in which rotationally driven upper rollers of a roller segment are applied against the cast strand, wherein a measuring device is actuated for operations in conjunction with a crossbeam.
- the rotatably mounted on the traverse, driven upper roller is set to oscillate against the solidifying G manstrang and continuously obtained measurements from the resulting by the location-dependent strength of the casting strand amplitudes of the actuating force. From these measurements, the position of the sump tip is closed.
- the position of the sump tip is determined by indirectly measuring the displaceable amount of the core liquid.
- BESTATIGUNGSKOPIE volume per unit length is carried out by a direct measurement of self-adjusting process parameters via force and / or displacement signals on fixed or engageable individual support rollers or groups of fixed or adjustable support roller pairs. Building on these measurements, a model calculation is performed for the instantaneous position of the sump tip, as a result of which the variable casting parameters are continuously adjusted.
- a strand guide for continuous slab casting consists of the consecutively arranged segments, wherein the opening dimension between the rolls in the segments decreases from segment to segment by only a few tenths of a millimeter in order to follow the shrinkage of the strand. If the strand in one segment has not yet solidified, the strand shells are forced apart as a result of the ferro- static internal pressure. This internal pressure must be held by the segment upper frame, which is connected to the segment fixed side by, for example, position-controlled cylinders.
- the springing up of the segments is between approx. 0.5 mm and 4 mm. If the segment in which the slab solidifies, for example, without load to 250 mm, the slab solidifies due to the springing, for example, with a thickness of 252 mm.
- the following segment stands on a roller opening dimension of for example 249.8 mm. The approximately 2 mm thicker slab so squeezes through the following segment and pushes it on.
- a force is also measured when the slab has solidified before the relevant segment.
- all the rollers are in contact with the solidified slab and rotate; the drive roller, with which the slab is driven, has a drive torque which is higher than the idling torque.
- the degree of suspension of the segment in which the slab solidifies depends on the solidification point in the respective segment; the farther the solidification point runs towards the end of the segment, the greater is the spring-back load. This leads to a higher force due to the larger inlet thickness of the slab in the next segment.
- the solidified slab is warmer and thus "softer", which reduces the force increase in the next segment. ment in the next, in addition to the increasing ferrostatic load added.
- the invention is therefore the object of the method of the type described above in such a way and to propose an associated device with which or with which it is possible to determine the position of the sump tip during continuous casting in a simpler and more accurate manner.
- a clear statement about the position of the sump tip in the strand guide should be able to be made.
- the solution of this object by the invention is characterized in that the method comprises the steps of: a) increasing the distance of the rollers of the segment subframe and the segment upper frame of a measuring segment for at least one roller to a value which exceeds the intended inlet thickness of the solidified metal strand in the Measuring segment is located; b) monitoring at least one operating parameter of the at least one roller set at a greater distance, the operating parameter corresponding to a desired value if the roller does not contact the metal strands; c) reporting the position of the sump tip as lying in the region of the role as soon as the value of the monitored operating parameter of the at least one role deviates from the desired value.
- the distance of all the rollers of the measuring segment can be adjusted to the increased distance.
- the monitored operating parameter may be the force with which the metal strand presses on the at least one roller.
- the force can be measured directly (eg via a measuring element integrated into the roll) or indirectly (eg via the force of a piston-cylinder system that carries the roll and delivers it to the surface of the metal strand) ,
- the monitored operating parameter may also be the drive torque with which the at least one roller, designed as a driven roller, drives the metal strand. Furthermore, it is possible that the monitored operating parameter is the rotational speed with which the at least one roller rotates.
- the setpoint of the monitored operating parameter is preferably zero.
- the casting speed can be selected so that the position of the sump tip reaches a region upstream of the measuring segment in the casting direction.
- the increase in the distance according to the above step a) takes place to a value which corresponds to the intended running-in thickness of the solidified metal strand into the measuring segment plus a safety amount.
- the amount of security is preferably between 0.1 mm and 1 mm.
- the proposed continuous caster comprising a support roll stand of successive roll segments in the casting direction, wherein each roll segment comprises a segment subframe with a number of rolls and a segment top frame with a number of rolls, the rolls of the segment subframe and the rolls of the segment top frame defining one another.
- movement means are provided in order to increase the distance of the rollers of the segment subframe and of the segment upper frame of a measuring segment for at least one roller to a value which exceeds the intended running-in thickness of the solidified metal strand lies in the measuring segment and that measuring means are provided for monitoring at least one operating parameter of the at least one roller set at a greater distance in order to compare the measured value with a desired value.
- the measuring means may be associated with comparison and alarm means which are triggered when the value of the operating parameter measured by the measuring means does not agree with the setpoint.
- the movement means can be designed to increase the distance between segment subframe and segment upper frame. They can also be designed to measure the force with which the metal strand presses on the at least one roller. Furthermore, the measuring means for measuring the drive torque may be formed, with which the at least one roller, designed as a driven roller, drives the metal strand. Finally, it can be provided that the measuring means are designed to measure the rotational speed with which the at least one roller rotates.
- the position of the bottom tip can therefore be determined very precisely in accordance with the proposed procedure. This is made possible by lifting the upper segment frame or at least one drive roller or its Hubtraverse. The evaluation of the bulge takes place with the force, drive torque or speed signals.
- embodiments of the invention are shown.
- FIG. 1 shows schematically a part of the support roll stand of a continuous casting plant, namely three successive casting segments in the casting direction during normal operation
- Fig. 2 schematically in the illustration of FIG. 1, the roll segments, wherein the middle is prepared as a measuring segment for measurement, in front of Measuring segment lying sump tip,
- FIG. 3 shows the roller segments according to FIG. 2 with the sump tip entering the measuring segment
- Fig. 6 for the measuring operation, the diagram of FIG. 5, in which the force acting on the measuring roller contact force between roller and metal strand is plotted over time, the sump tip is from time zero to a time to before the measuring roller and the Sump tip at time to reach the measuring roller,
- FIG. 7 is a schematic view of three roller segments following one another in the casting direction during normal operation, wherein a roller of the segment upper frame can be lifted off the metal strand via a lifting cross-piece
- Fig. 8 shows schematically in the illustration of FIG. 7, the roller segments, wherein the roller located on the Hubtraverse is prepared for measurement, lying in front of the measuring segment sump tip, and
- FIG. 9 shows the roller segments according to FIG. 8 with the sump tip entering the measuring segment.
- Fig. 1 to see a part of the support roller frame of a continuous casting, namely three in the casting direction G of a metal strand 2 successively arranged roller segments 3.
- the metal strand 2 runs horizontally through the roller segments 3; This is usually done at an angle to the horizontal, to redirect the vertically emerging from the mold strand into the horizontal.
- Each roller segment 3 has a segment subframe 4 and a segment upper frame 6.
- rollers 5 are arranged which form a lower pass line U for the metal strand 2.
- 6 rollers 7 are arranged in the segment upper frame, which form an upper pass line O for the metal strand 2.
- the pass line is characterized by a distance ao existing between the rollers 5 and 7.
- the rollers may be rotationally driven to convey the metal strand 2 in the casting direction G.
- the precise positioning of the segment upper frame to the segment substructure is effected by position-controlled piston-cylinder systems 10.
- the force is measured normal to the surface of the metal strand 2 on a roller 7 of the segment upper frame 6, the result is a course during the passage of the metal strand 2, as illustrated by way of example in FIG. 5 over time.
- the sump tip 1 of the metal strand 2 lies in the casting direction G in front of the middle roll segment 3.
- This middle roll segment is subsequently addressed as the measuring segment 3 '.
- any roller segment of the support roller frame can be used as a measuring segment.
- the measurement of the sump tip 1 of the metal strand 2 is prepared by raising the segment upper frame 6 of the measuring segment 3 '(see arrow), ie between the rollers 5 and 7 instead of the distance a 0 greater distance a- ⁇ .
- the distance ai is a value which corresponds to the intended inlet thickness of the metal strand 2 in the measuring segment 3 ', plus a safety amount between 0.1 mm and 1 mm. This ensures that - if the metal strand 2 is hardened when entering the measuring segment 3 '- a contact of the metal strand 2 with the upper rollers 7', which now act as measuring rollers, does not take place.
- measuring means which can detect an operating parameter of the rollers T.
- this is preferably the force F in the direction normal to the metal strand surface, which is exerted on the roller 7 ', the drive torque M, which exerts the roller 7' on the metal strand 2 or the rotational speed n of the roller 7 '(in the case of a non-driven roller). All these parameters are zero (or an idling moment M is present) if the roller 7 'has no contact with the metal strand 2.
- the piston-cylinder system 10 with which the measuring roller 7 'can be moved normal to the surface of the metal strand 2, or by measuring means, which are inserted into the piston-cylinder system.
- System 10 are integrated to capture.
- the sump tip 1 moves towards the measuring segment 3 '(namely, by increasing the casting speed and thereby moving the sump tip 1 to the right in FIGS. 1 to 3)
- the metal strand 2 with the sump tip 1 enters the measuring segment 3' , as shown in Fig. 3.
- the rollers 7 'of the measuring segment 3' are set to the value a, and thereby lifted off the registration line O, the metal strand 2 lacks on its upper side support and guidance by the rollers 7 '. Accordingly, it comes to the bulge 8 of the metal strand 2 shown in Fig. 3.
- the bulge 8 which is shown as exaggerated in Fig. 3 as the distance ai in relation to the distance ao, has the consequence that the left upper roller 7 'of the measuring segment 3' comes into contact with the metal strand 2 and the measuring means accordingly a measured value for the force, for the drive torque M or for the speed n, which are not equal to zero (or in the case of the drive torque, a value above the idling torque). Since the recess 8 can be attributed to the position of the sump tip 1, the statement can now be made that at the point in time at which measured values not equal to zero are measured on the roll T, the sump tip 1 is located in the inlet region of the measuring segment 3 '. located. In Fig. 4 it can be seen how the sump tip 1 slowly - with increasing casting speed - moves in the casting direction G.
- FIG. 6 analogously to FIG. 5, the contact force acting on the measuring roller T between roller T and metal strand 2 is plotted over time. Until the time t 0 , the sump tip 1 is still in the roll segment 3 to the left of the measuring segment 3 '. Accordingly, there is no contact between the roller 7 'and the metal strand 2; the force F is zero. Occurs, however, at the time to the sump tip 1 in the measuring segment 3 'and if there is contact between the bulge 8 of the metal strand 2 and the measuring roller 7', a force is transmitted, the information on the entry of the sump tip 1 in the measuring segment 3 ' gives.
- the exact position of the sump tip is made possible by allowing a bulge 8 in the metal strand 2.
- the sump tip is preferably first shifted by appropriate selection of the casting speed at least in a segment in front of the segment in which the bulge is to be generated. Then the segment upper frame is lifted so far, until it is just lifted from the solidified slab.
- the degree of lifting corresponds to the springing of the preceding segments due to the ferrostatic load acting in these segments plus a small safety distance of a few tenths of a millimeter.
- the spring deflection of the segment is between 0.5 and 4 mm. Lifting the segment by this amount does not disturb the continuous casting process.
- the casting speed is now increased until the sump tip enters the raised segment.
- the internal pressure in the slab due to the liquid sump, forces the strand shells apart until they touch the rollers of the segment upper frame or segmentless side.
- the contact of the strand shell with the rollers causes a force on the segment upper frame or on the Segmentlosseite. This force is absorbed by the segment cylinders and can be measured.
- the roller bearings can be equipped with a bearing force measuring device, so that instead of the cylinder force and the bearing forces of the rollers can be evaluated.
- the clear force increase on the cylinders on the segment inlet side or on the roller bearings when the sump tip enters the raised segment is detected and is a measure of the position of the sump tip at the time the increase in strength. Knowing the position of the sump tip at this time, for example, a running solidification or temperature model can be adjusted.
- the Hubtraverse 9 is pulled just behind the pass line of the roller carpet of the segment upper frame, for example, with a position-controlled piston-cylinder system 10.
- the increase in the force of the cylinder 9 Hubtraverse, the bearing force of the drive roller and the increase in the drive torque of the roller can be used.
- a second possibility of detecting the shrinkage of the sump tip 1 into the measuring segment 3 ' is based on the detection and evaluation of the drive torque M of a driven measuring roller T in the upper segment frame 6.
- the drive roller T in the upper segmental frame 6 is firmly integrated either in the Hubtraverse 9, which is separately adjustable, or in the execution of the segment as a so-called. Cyberlink segment in the segment upper frame 6.
- the drive roller T mounted in the lifting cross-member 9 it is raised when the segment is lifted off into the pass line.
- the drive can no longer transmit drive torque, the drive rotates with its idling torque.
- the casting speed is now increased, with the sump tip 1 entering the raised segment (measuring segment 3 ') under the driven roller 7'.
- the internal pressure in the slab due to the liquid sump forces the slats apart until they contact the drive rollers.
- the contact of the strand shell with the drive roller T causes a force on this role. Due to this force, a drive torque can now be transmitted again. The drive torque can be measured.
- the clear increase in the drive torque at the drive roller at the inlet of the sump tip in the raised segment is detected and is a measure of the position of the sump tip at the time of torque increase. Knowing the position of the sump tip at this time, in turn, a running solidification or temperature model can be adjusted.
- a third possibility to detect the shrinkage of the sump tip 1 in the lifted segment represents the detection and evaluation of the rotational speed of a non-driven roller in the segment upper frame or in the Segmentlosseite.
- the non-driven strand guide rollers integrated in the upper section of the segment lose contact with the solidified slab when the segment upper frame or segmentless side is lifted off and no longer rotate. If you equip the non-driven strand guide rollers with a speed sensor, the speed of the rollers can be detected. After lifting the segment upper frame, the casting speed is now increased until the sump tip enters the raised segment. The nendig in the slab, due to the liquid sump pushes the strand shells apart until they touch the rollers of the segment upper frame or the segmentless side. The contact of the strand shell with the rollers causes a force on the roller. By conveying the metal strand 2 in the casting direction G, the rollers are rotated. Their speed can be measured.
- the increase in the speed is detected and is a measure of the position of the sump tip at the time of start of rotation of the rollers. Knowing the position of the sump tip at this time, in turn, a running solidification or temperature model can be adjusted.
- the described procedure is not suitable for detecting only the position of the sump tip in the transient case, but also for the stationary case.
- roller segment 3 roller segment 3 'measuring segment
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102009031651A DE102009031651A1 (de) | 2009-07-03 | 2009-07-03 | Verfahren zum Bestimmen der Lage der Sumpfspitze eines gegossenen Metallstrangs und Stranggießanlage |
| PCT/EP2010/003942 WO2011000549A1 (de) | 2009-07-03 | 2010-07-02 | Verfahren zum bestimmen der lage der sumpfspitze eines gegossenen metallstrangs und stranggiessanlage |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2448695A1 true EP2448695A1 (de) | 2012-05-09 |
| EP2448695B1 EP2448695B1 (de) | 2017-09-06 |
Family
ID=42617484
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP10732652.2A Active EP2448695B1 (de) | 2009-07-03 | 2010-07-02 | Verfahren zum bestimmen der lage der sumpfspitze eines gegossenen metallstrangs und stranggiessanlage |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP2448695B1 (de) |
| CN (1) | CN102470432B (de) |
| DE (1) | DE102009031651A1 (de) |
| WO (1) | WO2011000549A1 (de) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN116159976B (zh) * | 2023-02-09 | 2025-04-22 | 中冶赛迪工程技术股份有限公司 | 一种铸坯跟踪方法及系统 |
Family Cites Families (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT378707B (de) * | 1983-01-11 | 1985-09-25 | Voest Alpine Ag | Verfahren zum ueberwachen einer bogenstranggiessanlage |
| DE3907905C2 (de) * | 1988-07-04 | 1999-01-21 | Mannesmann Ag | Stranggießverfahren |
| IT1252847B (it) * | 1991-10-31 | 1995-06-28 | Danieli Off Mecc | Gruppo di prelaminazione controllata per bramme sottili uscenti da colata continua |
| AT401744B (de) * | 1993-10-14 | 1996-11-25 | Voest Alpine Ind Anlagen | Verfahren und anlage zum stranggiessen |
| DE19508474A1 (de) * | 1995-03-09 | 1996-09-19 | Siemens Ag | Intelligentes Rechner-Leitsystem |
| DE69601409T2 (de) * | 1995-11-28 | 1999-09-02 | Danieli & C. Officine Meccaniche S.P.A. | Verfahren und Vorrichtung zum geregelten Vorwalzen von aus einer Stranggiessanlage austretenden Dünnbramme |
| DE19720768C1 (de) | 1997-05-07 | 1999-01-14 | Mannesmann Ag | Verfahren und Vorrichtung zum Erzeugen von Brammen aus Stahl |
| DE102004002783A1 (de) | 2004-01-20 | 2005-08-04 | Sms Demag Ag | Verfahren und Einrichtung zum Bestimmen der Lage der Sumpfspitze im Gießstrang beim Stranggießen von flüssigen Metallen, insbesondere von flüssigen Stahlwerkstoffen |
| DE102004048618A1 (de) * | 2004-10-06 | 2006-04-13 | Sms Demag Ag | Verfahren und Rollensegment zum Bestimmen der Kernerstarrung und/oder der Sumpfspitze beim Stranggießen von Metallen, insbesondere von Stahlwerkstoffen |
| CN1911561A (zh) * | 2005-08-09 | 2007-02-14 | 宝钢集团上海梅山有限公司 | 一种板坯连铸轻压下位置的控制方法 |
| DE102006016375B4 (de) | 2006-04-05 | 2023-02-16 | Sms Group Gmbh | Verfahren und Einrichtung zum Bestimmen der Kernerstarrung und/oder der Sumpfspitze beim Stranggießen von Metallen, insbesondere von Stahlwerkstoffen |
| DE102006027066A1 (de) * | 2006-06-10 | 2007-12-13 | Sms Demag Ag | Vorrichtung und Verfahren zum Führen eines Bandes |
| CN100493773C (zh) * | 2006-10-25 | 2009-06-03 | 宝山钢铁股份有限公司 | 动态轻压下控制方法 |
| DE102007004053A1 (de) * | 2007-01-22 | 2008-07-31 | Siemens Ag | Gießanlage zum Gießen eines Gießguts und Verfahren zur Führung eines Gießguts aus einem Gießbehälter einer Gießanlage |
| DE102008014524A1 (de) * | 2007-12-28 | 2009-07-02 | Sms Demag Ag | Stranggießanlage mit einer Vorrichtung zur Bestimmung von Erstarrungszuständen eines Gießstrangs und Verfahren hierfür |
| DE102008050393A1 (de) * | 2008-10-02 | 2010-04-08 | Sms Siemag Aktiengesellschaft | Anordnung und Verfahren zur Detektierung eines Betriebszustandes einer Strangführung |
-
2009
- 2009-07-03 DE DE102009031651A patent/DE102009031651A1/de not_active Withdrawn
-
2010
- 2010-07-02 EP EP10732652.2A patent/EP2448695B1/de active Active
- 2010-07-02 WO PCT/EP2010/003942 patent/WO2011000549A1/de not_active Ceased
- 2010-07-02 CN CN201080031061.4A patent/CN102470432B/zh not_active Expired - Fee Related
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2011000549A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| EP2448695B1 (de) | 2017-09-06 |
| CN102470432B (zh) | 2015-05-13 |
| DE102009031651A1 (de) | 2011-01-05 |
| CN102470432A (zh) | 2012-05-23 |
| WO2011000549A1 (de) | 2011-01-06 |
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