EP2555889A1 - Method and apparatus for setting the position of the liquidus tip in a cast strand - Google Patents
Method and apparatus for setting the position of the liquidus tip in a cast strandInfo
- Publication number
- EP2555889A1 EP2555889A1 EP11710744A EP11710744A EP2555889A1 EP 2555889 A1 EP2555889 A1 EP 2555889A1 EP 11710744 A EP11710744 A EP 11710744A EP 11710744 A EP11710744 A EP 11710744A EP 2555889 A1 EP2555889 A1 EP 2555889A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- strand
- casting
- impulse
- cast
- cast 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
- B22D11/12—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
-
- 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
-
- 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
- B22D11/201—Controlling or regulating processes or operations for removing cast stock 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
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D2/00—Arrangement of indicating or measuring devices, e.g. for temperature or viscosity of the fused mass
- B22D2/003—Arrangement of indicating or measuring devices, e.g. for temperature or viscosity of the fused mass for the level of the molten metal
Definitions
- the present invention relates to a method and an apparatus for adjusting the position of the sump tip in a cast strand during the continuous casting of liquid metal, in particular steel materials in a continuous casting plant.
- the invention relates to the use of such a method for optimizing computer simulations for adjusting the position of the sump tip.
- the invention finds particular application in block systems with individual driver rollers in the outlet of the strand guide.
- Such a method and an apparatus for carrying out the method are known, for example, from international patent application WO 2005/068109 A1.
- the disclosure provides that arranged at various points along the strand guide from the immediate area below the continuous casting mold to a maximum theoretical point of complete solidification of the casting mold cast constant casting rate pressure stamp in the form of support roller guides or individual support rollers and suitable actuators, for example in shape can be controlled by hydraulic cylinders. Actuated via force and / or path signals, the actuators give a controlled impulse to the surface of the cast strand via the support rollers. If the pulse is applied to a region of the cast strand with a still liquid core, the momentum leads to a displacement of the liquid volume.
- This displacement of the liquid volume typically leads to a temporary change in the molten bath level in the continuous casting mold, the change being detectable via a suitable sensor device.
- a suitable sequence of impulse tasks on the cast strand in or against the casting direction can be determined in particular whether the cast strand at a certain time at a particular location of the impulse task nor a liquid core, a lower or higher here partial solidification or completely solidified. In this way, the position of the swamp tip can be located.
- the object of the invention is to disclose an alternative method and an alternative apparatus as well as a use for the alternative method.
- the bath level shows no reaction to the discontinued momentum, this means that the strand at the level of the fixed location already has a more or less severe partial solidification or is even completely solidified; in any case, he no longer has a liquid core there.
- the position of the sump tip can be adjusted at the fixed location by casting the casting strand at a casting speed which is greater than the velocity V1 and less than or equal to the casting speed V2.
- the method according to the invention is distinguished by the fact that it describes less a possibility for determining the position of the sump tip at constant casting parameters, but rather shows a possibility of selecting the sump tip by suitable choice of the casting speed at the height of a certain location in the strand guide, namely to set the location of the impulse task.
- the sump tip in the casting strand is adjusted at the fixed location within the strand guide by selecting a velocity V S which is greater than a first casting velocity V 1 at which the impulse applied to the casting strand does not react at the bath level to cast the casting strand dissolves, and is less than a second casting speed V2, at which the pulse applied to the casting strand triggers the reaction at the bath level.
- the difference between the first and the second casting speed in the repeated passage through the method steps (b) and (c) is chosen as small as possible.
- the invention provides according to a further embodiment, that the impulse is applied to the cast strand in all runs of the method steps (b) and (c), each with an equal predetermined force or with an equal predetermined path of the plunger.
- This procedure allows an improved allocation of the reactions at the bath level to the impulses applied to the cast strand and thus ultimately a more precise adjustment of the bottom level at the level of the fixed location.
- the force applied to the cast strand with the impulse or the path of the plunger traveled when the impulse is detected are measured and evaluated together with the observed reaction or non-reaction to the impulse at the bath level decide whether at the location of the impulse task of the cast strand still has a liquid core or a more or less higher partial solidification or even completely solidified. If the impulse is applied to the cast strand with a predetermined force or pressure, it is advantageous that this force or pressure is about one third higher than the ferrosstatic pressure in the interior of the not yet solidified strand.
- the second casting speed v2 not only the reaction of the bath level in the form of an increase thereof is checked, but additionally - in the sense of an AND operation - whether at a given momentum force - the indentation depth into the cast strand at the location of the impulse task exceeds predetermined threshold value, or whether - for a given impulse path - the counteracting of the G manstrangober Design the pressure die force falls below a certain threshold.
- the plunger is designed as a strand guiding roller or as a driver roller within the strand guide.
- the strand guide roller or driver roller is anyway provided in the strand guide. hen; that is, when using these elements as a plunger no separate element needs to be installed as a plunger, which reduces the installation cost of the device according to the invention.
- the object of the invention is further achieved by a first use of the method according to the invention.
- This first use provides that the method according to the invention for optimizing model calculations / simulations for determining or adjusting the position of the sump tip is used.
- the above-mentioned object is achieved by a second use for the method according to the invention, according to which the sump tip is first adjusted to the height of the predetermined fixed location with the aid of the method and subsequently the position of the sump tip is moved to another desired location along the strand guide, by suitably changing the casting speed;
- This use of the method according to the invention is based on the application of the solidification law known in casting technology.
- the FIGURE shows the device 100 according to the invention for adjusting the position of the sump tip in a cast strand 200 during the continuous casting of liquid metals, in particular steel materials in a continuous casting plant 300
- Continuous casting plant comprises a continuous casting mold 310 for casting the casting strand and a strand guide 320 arranged downstream in the casting direction.
- the strand guide consists of a plurality of roller guides 322 arranged one behind the other for guiding the freshly cast casting strand 200 until it solidifies.
- the strand guide roller 130-n is acted on by an actuator 140 with the pulse, wherein the actuator in turn is controlled by a control device 180 with a control signal accordingly.
- the device 100 comprises a sensor device 160 for detecting a change in the bath level 312 in the mold 310 and an evaluation device 150 for evaluating the change in the bath level detected by the sensor device and
- the evaluation device 150 may be assigned a display device 170 for displaying the position of the sump tip at a specific casting speed with respect to the predetermined fixed location in the strand guide 320, which is represented by the stationary position of the plunger 130-n.
- the method according to the invention for adjusting the position of the sump tip at the level of the fixed location in the strand guide provides for multiple repetition of certain method steps at respectively changed casting speed.
- the setting of a first casting speed takes place in a step a).
- a process step b) at least one pulse at the fixed predetermined location within the strand guide on the casting strand 200 abandoned.
- the pulse is applied to the cast strand with the above-mentioned plunger 130-n, for example in the form of a strand guide roller.
- the momentum must be so strong that it causes a local compression of the casting strand in its thickness, in particular in the presence of still liquid core.
- This compression of the casting strand in its thickness results in a still existing liquid core volume to a shift of this volume of liquid, this shift possibly causes a reaction at the bath level.
- this displacement of the liquid volume causes a temporary increase of the bath level in immediate proximity to the task of the pulse.
- the method therefore provides, in a method step c), for the bath level to be monitored as to whether or not it shows a reaction in the form of a temporary increase in an appropriate temporal proximity, that is to say directly on the pulse.
- the process steps b) and c) according to the invention at least once, but preferably repeated several times, each with changed casting speeds, however, the pulses are always in each case at the same fixed location within the strand guide on the casting strand 200 abandoned; see process step d).
- each with different casting speeds then either a reaction at the bath level or not.
- a first casting speed V1 can be detected, in which the impulse applied to the casting strand does not trigger a reaction at the bath level, and a second casting speed V2 is still detectable, which is greater in comparison to the first speed and in which impulse applied to the cast strand dissolves the reaction at the bath level; see method step e).
- the triggering of no reaction at the bath level at the casting speed V1 means that no liquid core volume was present in the cast strand 200 at this casting speed V1 at the fixed location of the impulse task.
- the detection of a reaction of the bath level with casting at the casting speed V2 means that at this casting speed liquid core volume was still present in the casting strand at the location of the impulse application; see step e).
- This knowledge uses the inventive method for adjusting the sump tip in the cast strand at the level of the fixed location by casting the cast strand with a casting speed VS which is greater than the casting speed V1 but less than the casting speed V2.
- the actuators 140 which are typically used as hydraulic Raulikzylinder are formed, preferably formed either force-controlled or path-controlled.
- the forces or paths or indentation forces actually exerted on the cast strand in the impulse task are detected metrologically with the aid of a second sensor device 120 and likewise evaluated with regard to the presence of a still liquid core, partial solidification or solidification.
- a measured indentation depth of the plunger 130-n into the casting strand 200 exceeds a predetermined threshold value; then this may be due to the fact that the strand shell is still viscous, although no liquid core volume is already present in the cast strand, or that actually still a liquid core is present in the cast strand.
- the evaluation of the indentation depth alone does not allow a clear conclusion on the internal condition of the cast strand. In order to exclude this case of uncertainty, the reaction of the bath level is checked for the pulse according to the invention.
- the reaction of the bath level would be unique to the example described: that is, in the case where the strand shell is still viscous but no liquid core volume is present, the bath level would show no reaction while in the other case, if still liquid core volume would be present, the Badador react with a corresponding increase.
- the observation at the bath level can basically be regarded as a substitute for the evaluation of the indentation depth or counterforce in the case of pulse application to the cast strand.
- the criterion could be defined that both - for a given force - a certain minimum depth of indentation in the cast strand due to the pulse must be determined as well as directly on this impulse also a reaction at the bath level are detected got to. If both AND-linked events coincide, the presence of the sump tip at the height of the location of the plunger or the controlled support or driver roller can be concluded with a particularly high degree of certainty.
- a reaction of the bath level in the form of an increase of the same does not necessarily have to be carried out by a previously applied impulse of the printing stamp or roll in the strand guide; rather, it often comes to fluctuations in the bathroom, for example, turbulent incoming new melt.
- the said AND operation provides additional security in determining or setting the position of the sump tip in comparison to the sole evaluation of the reaction at the bath level.
- the method according to the invention is particularly suitable for optimizing a model calculation for determining or adjusting the position of the sump tip.
- the position of the sump tip under the same casting conditions on the same cast strand is then estimated or set with the aid of a model calculation or simulation.
- the variables of the model calculation or of the simulation program are optimally adjusted in such a way that the position of the sump tip estimated using the model calculation or simulation matches as closely as possible with the previously determined real position or setting of the sump seats. This procedure makes sense because it is assumed that the position of the sump tip can be determined particularly accurately or adjusted to the location of the pulse task with the inventive method.
- at least the so-called correction K factor should be optimally set as a variable.
- the method according to the invention is also suitable for a second use, näml I to move the position of the sump tip in the desired manner.
- the following steps have to be carried out:
- the sump tip is adjusted at the level of the location of the impulse task by casting the cast strand with the speed VS according to the method according to the invention. Subsequently, the sump tip can be moved to another location in or against the casting direction by suitably changing the casting speed according to the solidification law known in continuous casting technology. LIST OF REFERENCE NUMBERS
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE201010014347 DE102010014347A1 (en) | 2010-04-09 | 2010-04-09 | Method and device for adjusting the position of the sump tip in a cast strand |
PCT/EP2011/054320 WO2011124466A1 (en) | 2010-04-09 | 2011-03-22 | Method and apparatus for setting the position of the liquidus tip in a cast strand |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2555889A1 true EP2555889A1 (en) | 2013-02-13 |
EP2555889B1 EP2555889B1 (en) | 2016-09-21 |
Family
ID=43976836
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP11710744.1A Active EP2555889B1 (en) | 2010-04-09 | 2011-03-22 | Method for setting the position of the liquidus tip in a cast strand |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP2555889B1 (en) |
DE (1) | DE102010014347A1 (en) |
WO (1) | WO2011124466A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN106426666A (en) * | 2016-11-18 | 2017-02-22 | 江苏智石科技有限公司 | Quick mold change trolley and mold change method thereof |
CN108213371A (en) * | 2018-01-02 | 2018-06-29 | 邯郸钢铁集团有限责任公司 | A kind of method of the dynamic adjustment red base pressure of slab caster |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ITMI20121185A1 (en) * | 2012-07-05 | 2014-01-06 | Danieli Off Mecc | METHOD OF DETERMINING THE CLOSING POSITION OF THE LIQUID CONE IN THE CONTINUOUS CASTING OF METAL PRODUCTS |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19720768C1 (en) | 1997-05-07 | 1999-01-14 | Mannesmann Ag | Method and device for producing steel slabs |
DE102004002783A1 (en) | 2004-01-20 | 2005-08-04 | Sms Demag Ag | Method and device for determining the position of the sump tip in the casting strand in the continuous casting of liquid metals, in particular of liquid steel materials |
DE102004048618A1 (en) | 2004-10-06 | 2006-04-13 | Sms Demag Ag | Method and roller segment for determining the core solidification and / or the sump tip in the continuous casting of metals, in particular of steel materials |
DE102005026259A1 (en) | 2005-06-08 | 2006-12-14 | Sms Demag Ag | Method and apparatus for continuous casting of liquid metals, in particular of liquid steel materials, with a strand guide of support roller segments |
-
2010
- 2010-04-09 DE DE201010014347 patent/DE102010014347A1/en not_active Withdrawn
-
2011
- 2011-03-22 EP EP11710744.1A patent/EP2555889B1/en active Active
- 2011-03-22 WO PCT/EP2011/054320 patent/WO2011124466A1/en active Application Filing
Non-Patent Citations (1)
Title |
---|
See references of WO2011124466A1 * |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN106426666A (en) * | 2016-11-18 | 2017-02-22 | 江苏智石科技有限公司 | Quick mold change trolley and mold change method thereof |
CN108213371A (en) * | 2018-01-02 | 2018-06-29 | 邯郸钢铁集团有限责任公司 | A kind of method of the dynamic adjustment red base pressure of slab caster |
CN108213371B (en) * | 2018-01-02 | 2019-10-29 | 邯郸钢铁集团有限责任公司 | A kind of method of the dynamic adjustment red base pressure of slab caster |
Also Published As
Publication number | Publication date |
---|---|
EP2555889B1 (en) | 2016-09-21 |
DE102010014347A1 (en) | 2011-10-13 |
WO2011124466A1 (en) | 2011-10-13 |
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