EP2010348A1 - Process and device for determining the distance between the rollers of support rollers and the strand guider structure of a continuous strand casting facility - Google Patents
Process and device for determining the distance between the rollers of support rollers and the strand guider structure of a continuous strand casting facilityInfo
- Publication number
- EP2010348A1 EP2010348A1 EP07723964A EP07723964A EP2010348A1 EP 2010348 A1 EP2010348 A1 EP 2010348A1 EP 07723964 A EP07723964 A EP 07723964A EP 07723964 A EP07723964 A EP 07723964A EP 2010348 A1 EP2010348 A1 EP 2010348A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- roller
- strand
- roll
- casting
- continuous casting
- 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
Links
- 238000009749 continuous casting Methods 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 14
- 238000005266 casting Methods 0.000 claims abstract description 53
- 230000000694 effects Effects 0.000 claims abstract description 16
- 239000007788 liquid Substances 0.000 claims abstract description 8
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 6
- 238000013016 damping Methods 0.000 claims abstract description 6
- 239000010959 steel Substances 0.000 claims abstract description 6
- 229910001338 liquidmetal Inorganic materials 0.000 claims abstract description 5
- 239000000463 material Substances 0.000 claims abstract description 5
- 238000005457 optimization Methods 0.000 claims description 16
- 230000001052 transient effect Effects 0.000 claims description 5
- 230000010355 oscillation Effects 0.000 claims description 2
- 108090000623 proteins and genes Proteins 0.000 claims 1
- 238000007711 solidification Methods 0.000 description 5
- 230000008023 solidification Effects 0.000 description 5
- 238000004590 computer program Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000010363 phase shift Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
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
- B22D11/128—Accessories for subsequent treating or working cast stock in situ for removing
Definitions
- the invention relates to a method for determining the roll spacings of support rollers in a strand guide framework of a continuous casting plant for the casting of liquid metals, in particular of liquid steel materials, in which the formed in a stationary, oscillating continuous casting mold, in the interior still liquid cast strand is pulled out and the extraction force in pairs, individually driven or idler support rollers is transmitted, wherein the respective jaw width is continuously adjusted to the thickness of the further solidifying G toysstrangs, the distances of the roller pairs or roller segments in the casting direction are set to a transient, moving with variable casting speed bulge and Badadorschwankonne be reduced in the continuous casting mold by influencing the resulting individual frequency.
- a method for determining the roller distances in a strand guiding framework of a continuous casting plant is known from DE 199 51 262 C1.
- the oppositely arranged rollers of the respective rows of at least one support roller segment have such spacings that, for a transient, moving with casting speed bulge of the casting strand, they have a phase shift delta with respect to a sinusoidal wave length with the roll distance. This changes the base roll distance of ⁇ l. As a result, a rocking of the casting mirror in the stationary continuous casting mold is to be avoided.
- a defined frequency is established in a continuous casting plant. This frequency is caused by a non-uniformity of the strand shell when passing through the roller distances.
- the roll spacings can take on positive as well as negative values during roll shifting. Therefore, the proposal seeks to eliminate pouring mirror variations that occur through the described string-shaped bulges in many places between the rollers and hereby lead to excessive G manapttikschwankept by which a certain and thus a targeted number of phase shifts to fix. This is a special way of designing the role plan to compensate for irregularities.
- the invention is based on the object, starting from the present on a continuous casting geometric shapes, the G hasslestrangumble, the strand thickness and the possible casting speeds and possibly other G stealparametem from the actual bulges occur at Sisrollenabpartyn and thereby primarily the effects on the Bad- Mirror as the starting point of the considerations to choose.
- the object is achieved according to the invention in that such different roller distances are combined, the result of the base roller spacing and the casting speed of several or all Einzelfrequen- zen the respective support roller a total distance profile (F) of the strand guide framework, from which an optimum for maximum damping of all Bumping effects is determined, due to which optimal roll distances are divided.
- the advantages are a stronger attenuation of the BadLiteschwankungen and the bulges at different casting conditions.
- This optimum of low initial amplitude, a continuous decay, a fast damping and a high overall time constant causes a small change in volume Kokillenbadapt.
- the susceptibility to failure or the swinging behavior of the mold bath mirror during process-related parameter changes such as, for example, changes in the casting speed, the steel quality, thickness or width changes, cooling changes, and the like. Like. cause less bulge effects.
- One embodiment provides that the optimum of the maximum attenuation of bath level fluctuations is determined from a graph of all vertices of the oscillations by an envelope that largely affects the vertices.
- the measurement of the vibrations of the bath level can, for example.
- a logarithmic curve is determined for the envelope.
- V sum of the volume units on the considered casting length
- Vgi eß casting speed in [mm / sec]
- t time in [sec]
- Another embodiment provides that the logarithmic envelope determined by the vertex "1" and the respective vertex “n” is determined according to the following factors:
- the enveloping logarithm curve is selected as a geometrically exact curve, which includes all vertices, according to the function, / ':
- Such a strand guide framework is formed in the design of the device of the invention from support roller segments or groups whose pairs of rollers are provided with optimally adjusted intervals in the casting direction, ie with mutually unequal distances, such that several or all individual frequencies of the respective support role to a summarized Total track profile of the strand guide framework, an optimum for a maximum attenuation of all bulge effects arise, due to which the roll distances are set optimally.
- the advantages are greater attenuation of bath level fluctuations and bulges under different casting conditions.
- the design of the roll carpet is based on the segment design of a continuous casting plant. The replacement of the support roller segments can be considered here.
- the optimization of the support roll distances in the casting direction also takes into account the geometric parameters of the strand guide elements, such as roll diameter, roll distances, grid lengths, solidification values (strand shell thickness, solidification length) and a variable casting speed.
- An embodiment of the device consists in the fact that the base roller spacing is reduced in the course of individual sections of the strand guide frame to an optimally set roller spacing between 5 - 40 mm.
- 1 is a side view of a sheet continuous casting with continuous casting mold and strand guide frame
- Fig. 1A shows a detail of Figure 1 on an enlarged scale
- Fig. 2 is a graph of the vibrations on the bath mirror of
- Fig. 3 is a further graph of the vibrations which act on the bath level after the roll pitch has been changed according to the invention.
- a strand guiding framework 3 for supporting, transporting and further cooling a casting strand 6 is provided, wherein the supporting roll spacings 4 in the casting direction 8 are influenced by the frequency of the driving and supporting forces on the supporting rolls 5.
- each roller pair 4 a has a base roller spacing 4 b to the lower edge of the continuous casting mold 2.
- the cast strand 6 formed in the stationary, oscillated continuous casting mold 2 is still liquid in the interior and the pull-out force is transmitted to the strand shell by pairs, individually driven or idle support rollers 5, wherein the respective mouth width 5a to the thickness 6a of the further solidifying cast strand. 6 is adjusted continuously.
- the pairs of rollers 4a and the support roll 5 or whole roller segments 7 or support roller groups 7a effect in the casting 8 transient, moving with variable casting speed bulges 9, whereby the harmful Badadorschwankache 10 are caused.
- roller spacings 4 of the support rollers 5, the roller pairs 4a or the support roller segments 7 or the support roller group 7a through an optimally adjusted roller spacing 4c are combined, wherein from a roller spacing 4 and the casting speed several or all individual frequencies of the respective support roller 5 are combined to form a total section profile F of the strand guide frame 3, from which an optimum for maximum damping of all bulge effects 9 is determined the support roller spacings 4 are set in optimum roller spacings 4c.
- the thickness and the width of the casting strand 6 are not shown with their change in different casting strands 6 in the plane, but must be taken into account in each individual case with:
- Ci valence of the roll "/" (effect parameter at the nth roll position)
- d / distance of the roll "/" to the bottom edge of the continuous casting mold in mm
- the optimized roller spacings 4c according to FIG. 1A (d1, d2, d3, d4) can be enlarged or reduced in an irregular sequence and conversely also reduced or enlarged, whereby due to the succession of constantly changing support roller distances, the bath level fluctuation can be minimized or completely avoided.
- the invention is for example.
- the optimum of the maximum attenuation of the BadLiteschwankeptept 10 can be taken from a graph 11 of all vertices 12, which are visible through small crosses 12a in Fig. 2.
- the envelope 13a determined by the mathematical relationship described in Equation A) is formed from the plurality of vertices 12.
- the vertices 12 are shown in their absolute magnitude so that the associated negative vertices find themselves in the positive part of the xy coordinate system. From Fig. 2 thus the envelope 13a can be seen before the optimization of the support roller spacings 4 in the casting 8.
- the graph 11 from FIG. 2 shows in a modified form:
- the envelope 13b is produced after the optimization.
- a logarithmic curve 13c can be calculated.
- the envelope 13c determined by the vertex "1" and the respective vertex "n” is calculated according to the following factors:
- the gray shaded area enclosed by the envelope 13b after optimization is a measure of the effect of the strand guide on the bath level in the continuous casting mold 2 and is referred to below as the bulge index ⁇ .
- the envelope 13b which includes the shaded area, is represented by the optimized logarithmic envelope 13c according to formula D). If this determined curve lies below the original envelope curve 13a, a low bulging index ⁇ is achieved and the effect on the bath level is already improved.
- the optimization is achieved if the following condition is met:
- ß Opt bulge index after optimization [m / sec]
- ß before bulge index before optimization [m / sec]
- the device for supporting and transporting a casting strand 6 in a strand guiding framework 3 of the continuous casting plant 1 is based on a continuous casting mold 2, from which all reference variables in the strand withdrawal direction 8 are measured.
- To the continuous casting mold 2 close the roller pairs 4a with their support roller spacing 4 at.
- the calculated and / or determined on the basis of measured variables ( Figure 2) optimally set roll spacing 4c (on one side, for example, the lot side of the strand guide) generates a single frequency (roller spacing linked to the casting speed) with one of the amplitudes shown.
- the respective amplitude is dependent on the roll diameter and the roll position and the respectively present solidification of the casting strand 6 at these corresponding position.
- the sum of the given individual amplitudes produces the total line profile "F" as shown in FIGS. 2 and 3.
- the design of the roll carpet is based on the support roll segment construction of the continuous casting plant 1.
- An exchange of support roller segments 7 can be considered.
- the functions of the formulas A) to E) are part of an optimization program in the computer program of the casting process.
- the optimization program includes the geometric parameters of the strand guide elements, such as roll diameter, support roller distances (4), grid lengths, as well as the solidification values, such as strand shell thickness, solidification length, and also detects variable casting speeds.
- the device with the strand guide frame 3 forms an optimized roller conveyor (from roller pairs 4a, support roller segments 7 or support roller groups 7a) and has correspondingly adapted bearings and traverses.
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 |
---|---|---|---|
DE200610018757 DE102006018757A1 (en) | 2006-04-22 | 2006-04-22 | Method for determining the roll spacings of support rollers and strand guide framework of a continuous casting plant for casting liquid metals, in particular liquid steel materials |
PCT/EP2007/003023 WO2007121838A1 (en) | 2006-04-22 | 2007-04-04 | Process and device for determining the distance between the rollers of support rollers and the strand guider structure of a continuous strand casting facility |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2010348A1 true EP2010348A1 (en) | 2009-01-07 |
Family
ID=38235025
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07723964A Ceased EP2010348A1 (en) | 2006-04-22 | 2007-04-04 | Process and device for determining the distance between the rollers of support rollers and the strand guider structure of a continuous strand casting facility |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP2010348A1 (en) |
CN (1) | CN101426603B (en) |
DE (1) | DE102006018757A1 (en) |
WO (1) | WO2007121838A1 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ITMI20052328A1 (en) * | 2005-12-06 | 2007-06-07 | Danieli Off Mecc | PLANT FOR THE PRODUCTION OF METAL TAPES |
DE102016213351A1 (en) | 2016-07-21 | 2018-01-25 | Sms Group Gmbh | Method for operating a strand guide in a continuous casting plant and corresponding strand guide |
AT519390B1 (en) * | 2016-12-13 | 2020-09-15 | Primetals Technologies Austria GmbH | Method and device for controlling a continuous caster |
DE102021207301A1 (en) | 2021-07-09 | 2023-01-12 | Sms Group Gmbh | Strand guide device and method for continuous casting of a metallic product in a continuous casting installation with such a strand guide device |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61150760A (en) * | 1984-12-24 | 1986-07-09 | Kawasaki Steel Corp | Continuous casting machine for molten metal |
JP4057118B2 (en) * | 1997-12-17 | 2008-03-05 | エス・エム・エス・デマーク・アクチエンゲゼルシャフト | Method for producing thin slabs in a continuous casting facility and continuous casting facility for carrying out this method |
JPH11320059A (en) * | 1998-05-06 | 1999-11-24 | Sumitomo Metal Ind Ltd | Continuous casting apparatus |
DE19951262C1 (en) * | 1999-10-25 | 2001-04-05 | Sms Demag Ag | Strand guidance roller frame used in continuous casting of thin steel slab from static mold, has adjustable roller spacing, to de-tune undesirable oscillations causing strand bulging |
US6467533B1 (en) * | 1999-10-28 | 2002-10-22 | Sumitomo Metal Industries, Ltd. | Machine and method for continuous casting of steel |
AT410408B (en) * | 2001-01-30 | 2003-04-25 | Voest Alpine Ind Anlagen | METHOD FOR CONTINUOUSLY casting METAL MELTS |
-
2006
- 2006-04-22 DE DE200610018757 patent/DE102006018757A1/en not_active Withdrawn
-
2007
- 2007-04-04 CN CN2007800144523A patent/CN101426603B/en not_active Expired - Fee Related
- 2007-04-04 WO PCT/EP2007/003023 patent/WO2007121838A1/en active Application Filing
- 2007-04-04 EP EP07723964A patent/EP2010348A1/en not_active Ceased
Non-Patent Citations (1)
Title |
---|
See references of WO2007121838A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2007121838A1 (en) | 2007-11-01 |
CN101426603A (en) | 2009-05-06 |
CN101426603B (en) | 2011-10-05 |
DE102006018757A1 (en) | 2007-10-25 |
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Legal Events
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
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17P | Request for examination filed |
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Owner name: SMS SIEMAG AG |
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