EP3359317B1 - Method and device for producing a metal strip by continuous rolling - Google Patents
Method and device for producing a metal strip by continuous rolling Download PDFInfo
- Publication number
- EP3359317B1 EP3359317B1 EP16782023.2A EP16782023A EP3359317B1 EP 3359317 B1 EP3359317 B1 EP 3359317B1 EP 16782023 A EP16782023 A EP 16782023A EP 3359317 B1 EP3359317 B1 EP 3359317B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- slab
- region
- casting machine
- cooling medium
- cooling
- 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.)
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- 238000005096 rolling process Methods 0.000 title claims description 32
- 238000000034 method Methods 0.000 title claims description 13
- 239000002184 metal Substances 0.000 title 1
- 238000005266 casting Methods 0.000 claims description 83
- 238000009413 insulation Methods 0.000 claims description 35
- 239000007921 spray Substances 0.000 claims description 35
- 238000001816 cooling Methods 0.000 claims description 34
- 239000002826 coolant Substances 0.000 claims description 28
- 239000000463 material Substances 0.000 claims description 13
- 238000010438 heat treatment Methods 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 238000005507 spraying Methods 0.000 claims description 3
- 230000006978 adaptation Effects 0.000 claims description 2
- 238000006073 displacement reaction Methods 0.000 claims 1
- 238000007711 solidification Methods 0.000 description 11
- 230000008023 solidification Effects 0.000 description 11
- 238000009826 distribution Methods 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 7
- 239000000243 solution Substances 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 238000013021 overheating Methods 0.000 description 4
- 230000001965 increasing effect Effects 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 239000010962 carbon steel Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 230000001939 inductive effect Effects 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 229910021384 soft carbon Inorganic materials 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012549 training Methods 0.000 description 1
Images
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
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
- B21B37/44—Control of flatness or profile during rolling of strip, sheets or plates using heating, lubricating or water-spray cooling of the product
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0203—Cooling
- B21B45/0209—Cooling devices, e.g. using gaseous coolants
- B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
- B21B45/0218—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes for strips, sheets, or plates
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0203—Cooling
- B21B45/0209—Cooling devices, e.g. using gaseous coolants
- B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
- B21B45/0233—Spray nozzles, Nozzle headers; Spray systems
-
- 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
- B22D11/1213—Accessories for subsequent treating or working cast stock in situ for heating or insulating 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
- B22D11/124—Accessories for subsequent treating or working cast stock in situ for cooling
- B22D11/1246—Nozzles; Spray heads
-
- 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
- B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould
- B22D11/225—Controlling or regulating processes or operations for cooling cast stock or mould for secondary cooling
Definitions
- the invention relates to a method for producing a metallic strip by means of endless rolling, in which a slab is first cast in a casting machine and this is then rolled continuously in a rolling train with at least one roll stand (it can also be pre-rolled endlessly and the strip can be finished discontinuously), wherein the casting machine has a strand guide in which the cast slab is guided in the conveying direction in the direction of the rolling mill, the material of the slab in the region of the strand guide being cooled by spraying a cooling medium by means of a number of cooling devices, each cooling device having a number of spray nozzles which are arranged side by side in the direction transverse to the conveying direction and via which the cooling medium is applied to the slab.
- the invention further relates to a device for producing the band.
- a casting machine usually has to produce different material qualities.
- soft carbon steel is cast at a high speed and a casting machine length is designed based on this.
- high-strength materials e.g. micro-alloyed steels and high-carbon steels
- silicon steels the casting speed is reduced for quality reasons. This leads to a solidification further inside the casting machine.
- a generic method is in the WO 2008/145222 A1 described.
- Other solutions reveal that WO 89/11363 A1 , the DE 690 07 240 T2 , the DE 10 2010 022 003 A1 , the EP 2 527 061 A1 , the DE 32 30 866 A1 , the DE 10 2009 019 784 A1 , the DE 100 51 959 A1 , the WO 2012/107143 A1 , the DE 10 2008 049 537 A1 and the WO 2008/025325 A1 ,
- the invention is therefore based on the object of further developing a generic method in such a way that it is possible with little effort to improve the slab or strip quality, in particular in the edge region.
- the compensation distance is preferably not longer than 120%, maximum 200%, of the above-mentioned minimum value.
- the slab is preferably heated in its edge region along the compensation path between the casting machine and the rolling mill.
- the average temperature in the edge area of the slab is preferably kept at least 20 K higher, preferably at least 100 K higher than the average temperature in the central area of the slab, at least at one location along the conveying direction of the slab.
- the edge area of the slab is preferably kept free of sprayed-on cooling medium or with a reduced cooling effect over a range between 40 and 150 mm from the lateral slab end.
- the spray zone width is preferably divided into narrow width sections which can preferably be acted upon separately by cooling medium, preferably between 50 mm and 300 mm, particularly preferably between 50 mm and 100 mm, in order to be able to optimally adapt the active water quantity to different slab widths.
- a further development provides that a temperature increase between the temperature of the slab in the edge area and the temperature of the slab in the middle area from the start of solidification of the slab to the end of solidification of the slab is preferably carried out continuously.
- the slab is preferably heated within a thermal insulation.
- At least one segment of the casting machine can be replaced by a lateral shift by a thermally insulated roller table that can be moved transversely to the conveying direction.
- the device for producing a metallic strip by endless rolling comprising a casting machine for casting a slab and a rolling mill adjoining it in the conveying direction of the slab with at least one rolling stand, the casting machine having a strand guide in the material of the slab in the conveying direction in the direction of the rolling mill is guided, with a number of cooling devices being provided with which the slab can be cooled in the region of the strand guide by spraying on a cooling medium, each cooling device having a number of spray nozzles which run in the transverse direction Are arranged next to each other to the direction of conveyance and via which the cooling medium can be applied to the material of the slab, is characterized according to the invention in that control means are provided in order to be able to operate at least one of the cooling devices in such a way that only a number in the central region of the slab Arranged spray nozzles cooling medium is applied to the slab, while no or only a limited amount of cooling medium is applied to the slab via the spray nozzles located in the edge region of the slab, with thermal insulation in the area
- a heating device is preferably arranged, which is designed to heat the slab along the compensation section between the casting machine and the rolling mill in its edge region.
- the zone widths or distances of the spray nozzles in the width direction of the slab are preferably between 50 and 300 mm, preferably between 50 and 100 mm. This makes it possible to positively influence the temperature distribution across the width.
- the thermal insulation in the direction transverse to the conveying direction can be arranged displaceably.
- a thermally insulated roller table with thermal insulation that can be moved transversely to the conveying direction can be arranged.
- the proposed measures improve in particular the slab and thus the strip quality at the edge.
- the invention is based on the knowledge that normal cooling in the rear area of the casting machine and during subsequent transport to the first roll stand, this has a particularly negative effect on the edge. In order to prevent this, it is provided that within the casting machine by deliberately switching off or reducing the segment cooling in the area close to the slab edges, these are kept warmer.
- the slab edge region is preferably kept in the range between 40 to 150 mm from the edge up to being warmer than the middle of the slab by solidification by at least 20 K, preferably by at least 100 K.
- the proposed measures regarding both the procedure and the design of the corresponding device result in addition to the temperature increase in the edge region of the slab or the strip, compressive stresses on the edge, which have a positive effect on edge cracking.
- the slab on the top and bottom as well as on the slab edges can be provided Optimally less to cool, to insulate, to keep warm or to warm the edge until shortly before the first rolling stand.
- Descaling of the slab for example in front of the first inline stand, is optionally dispensed with, preferably in the case of high-strength materials; this area can be thermally insulated.
- the proposed solution advantageously results in an improvement in the slab or strip quality at the edge, in particular in the case of high-strength materials.
- slab edge cracks during subsequent forming can be avoided.
- a casting strand or slab 1 can first be seen, which in the conveying direction F (which in FIG Figure 1 stands vertically on the drawing plane) the strand guidance of a casting machine happens.
- a cooling device in the form of a cooling beam 6 is arranged above the slab 1, the cooling device having a number of spray nozzles 7 arranged next to one another.
- Cooling medium 5 water or a water-air mixture can be sprayed onto the strand surface in order to cool it.
- the casting strand 1 extends in a direction Q transverse to the conveying direction F and has a central region M in and an edge region K.
- the overheating of the edge region K of the cast strand or slab 1, ie. H. the temperature increase of the edge region K relative to the central region M is advantageously increased successively from the start of solidification to the end of slab solidification.
- the segment cooling (for the entire casting machine or only in the area of the front or rear half of the casting machine in the conveying direction or alternately over the length of the casting machine) can be very finely structured across the width in order to be able to optimally set the desired effect for the different widths.
- Zone widths between 50 and 300 mm and particularly preferably between 50 and 100 mm above the width in the range of 90% from the minimum slab width to the maximum slab width are provided in order to avoid cold slab edges.
- the zones on the top and bottom and from roll to roll can be arranged offset by a half (or integer divided) nozzle pitch.
- Quantity-controllable two-substance nozzles are advantageously used as spray nozzles.
- the water quantities of the individual spray nozzles, which should remain passive, in the slab edge area and next to the slab can be reduced to zero, so that only a little nozzle cooling water or only air (to protect the nozzles) flows out. This effect can be supported by the use of dry segments in the rear area of the casting machine.
- the deactivated ones can alternatively be used Nozzle bar can also be moved out of the casting line or swung out.
- the absolute slab edge is somewhat colder than the slab in the middle or the mean temperature over the thickness in the area, because water partially flows over the edge and there is a two-dimensional radiation of heat. Due to the overheated slab edge area provided according to the invention and the subsequent additionally provided optional thermal insulation, however, there is advantageously a further temperature rise of the absolute slab edge there due to the temperature compensation or the heat conduction from the center to the edge or the lateral outer surface.
- Curve a shows the temperature distribution up to the slab edge after solidification, which is generated by reduced segment cooling or by switching off nozzles in the edge area.
- Curve b shows the temperature distribution after solidification in the casting machine without overheating of the slab edge according to the invention. It can be seen that the slab edge has become significantly colder.
- Curve c shows the temperature distribution up to the slab edge at the inlet of the inline stand with the slab edge overheated according to the invention or reduced segment cooling in the casting machine (without insulation).
- Curve d shows the temperature distribution up to the slab edge at the inlet of the inline stand without overheating the slab edge in the casting machine (without insulation).
- the curve e then also shows the temperature distribution up to the slab edge at the inlet of the inline stand according to the procedure according to the invention by means of reduced segment cooling in the slab edge area and thermal insulation on the top and bottom of the slab or the casting strand and / or the slab edges on large parts of the route between the solidification point and the first inline scaffolding.
- the arrow f indicates the potential that can be achieved according to the invention for increasing the slab edge temperature at the inlet of the inline stand.
- the compensation section between the casting machine 2 and the first roll stand of the rolling train 3 can be designed as a thermal insulation section, in which the slab is enclosed.
- a thermal insulation section in which the slab is enclosed.
- training in the form of a heated thermal insulation section is also possible.
- An unheated or heated thermal insulation section is also possible only in the area of the slab edges and / or Use of an oven or heating. In the case of a furnace or a heater, heating can be provided over the entire width of the slab (or only in the edge area), an increased heating power being provided in the edge area in order to heat the edge more strongly.
- thermal insulation 8 in the form of thermal insulation being arranged in each of the two edge regions K of the slab 1. This can be adjusted in the horizontal direction Q transversely to the conveying direction F, which is indicated by the double arrows.
- the thermal insulation 8 can also be arranged in a fixed manner. However, the adjustability is preferred, so that the insulation 8 can follow the slab edge.
- the slab edge insulation shown reduces the temperature difference between the slab center and the edge area K of the slab 1.
- the insulation 8 shown can be used in the roller table area and / or also in the rear area of the casting machine 2.
- slab shears, cold strand disposal, a scale washer and other units can also be arranged within the compensating section.
- the heat-insulating area can only be realized behind the casting machine and / or also in the rear area of the casting machine in one or more segments (in the horizontal part).
- These strand segments are arranged on a frame so that they can be moved transversely.
- one or two (or possibly more) segments are replaced by thermally insulated roller table groups, in which the necessary ones are now exchanged insulated roller table groups are pushed into the production line.
- This exchange of complete segment groups by completely insulated roller table groups or vice versa takes place before the sprue or between two casting sequences.
- the roller table group or the roller table frame and the segment group or the segment frame are connected to one another. Either the segments or an insulated roller table area can be in the production line.
- a casting machine 2 can be seen with laterally displaceable segments or a displaceable roller table, thermal insulation 8 (thermal insulation) being arranged in the production line at the top, bottom and sides.
- thermal insulation 8 thermal insulation
- the end of the casting machine is designated 10.
- Driver rollers or roller table rollers 11 convey the casting strand or the slab 1.
- the rolling train 3 (not shown) is arranged at a distance behind the casting machine 2.
- FIG 8 the displaceable arrangement is shown, in which the insulation 8 (thermal insulation) and alternatively the segment rollers 12 can be pushed into the production line.
- a displaceable frame 13 is present, which in the direction of the double arrow in Figure 8 can be moved. The respectively unused arrangement on its frame 13 is then next to the production line.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
- Continuous Casting (AREA)
Description
Die Erfindung betrifft ein Verfahren zum Herstellen eines metallischen Bandes durch Endloswalzen, bei dem zunächst in einer Gießmaschine eine Bramme gegossen und diese anschließend kontinuierlich in einer Walzstraße mit mindestens einem Walzgerüst gewalzt wird (es kann auch endlos vorgewalzt und das Band diskontinuierlich fertig gewalzt werden), wobei die Gießmaschine eine Strangführung aufweist, in der die gegossene Bramme in Förderrichtung in Richtung Walzstraße geführt wird, wobei das Material der Bramme im Bereich der Strangführung durch Aufspritzen eines Kühlmediums mittels einer Anzahl von Kühlvorrichtungen gekühlt wird, wobei jede Kühlvorrichtung eine Anzahl Spritzdüsen aufweist, die in Richtung quer zur Förderrichtung nebeneinander angeordnet sind und über die das Kühlmedium auf die Bramme ausgebracht wird. Des weiteren betrifft die Erfindung eine Vorrichtung zum Herstellen des Bandes.The invention relates to a method for producing a metallic strip by means of endless rolling, in which a slab is first cast in a casting machine and this is then rolled continuously in a rolling train with at least one roll stand (it can also be pre-rolled endlessly and the strip can be finished discontinuously), wherein the casting machine has a strand guide in which the cast slab is guided in the conveying direction in the direction of the rolling mill, the material of the slab in the region of the strand guide being cooled by spraying a cooling medium by means of a number of cooling devices, each cooling device having a number of spray nozzles which are arranged side by side in the direction transverse to the conveying direction and via which the cooling medium is applied to the slab. The invention further relates to a device for producing the band.
Eine Gießmaschine muss in der Regel verschiedene Materialqualitäten herstellen. Hierbei wird weicher Kohlenstoffstahl mit einer hohen Geschwindigkeit vergossen und basierend darauf eine Gießmaschinenlänge ausgelegt. Beim Gießen von hochfesten Materialien (beispielsweise von mikrolegierten Stählen und Hochkohlenstoffstählen) oder Siliziumstählen wird aus Qualitätsgründen die Gießgeschwindigkeit vermindert. Dies führt dabei zu einer Erstarrung weiter innerhalb der Gießmaschine.A casting machine usually has to produce different material qualities. Here, soft carbon steel is cast at a high speed and a casting machine length is designed based on this. When casting high-strength materials (e.g. micro-alloyed steels and high-carbon steels) or silicon steels, the casting speed is reduced for quality reasons. This leads to a solidification further inside the casting machine.
Um die Temperaturverluste für diese beispielsweise hochfesten Materialien zu vermindern, ist es aus der
Aus dem Beitrag
Ein gattungsgemäßes Verfahren wird in der
Der Erfindung liegt daher die Aufgabe zugrunde, ein gattungsgemäßes Verfahren so weiterzuentwickeln, dass es mit geringem Aufwand möglich wird, die Brammen- bzw. Bandqualität insbesondere im Kantenbereich zu verbessern.The invention is therefore based on the object of further developing a generic method in such a way that it is possible with little effort to improve the slab or strip quality, in particular in the edge region.
Die Lösung dieser Aufgabe durch die Erfindung ist dadurch gekennzeichnet, dass zumindest eine der Kühlvorrichtungen so betrieben wird, dass nur über eine Anzahl im Mittenbereich der Bramme angeordneter Spritzdüsen Kühlmedium auf die Bramme ausgebracht wird, während über die sich im Kantenbereich der Bramme befindlichen Spritzdüsen kein oder nur in vermindertem Umfang Kühlmedium auf die Bramme ausgebracht wird, wobei im Bereich der Strangführung und/oder im Bereich zwischen der Strangführung und der Walzstraße nur der Kantenbereich der Bramme mittels einer thermischen Isolation gegen Abkühlung geschützt wird, wobei die Bramme zwischen der Gießmaschine und der Walzstraße zum Ausgleich der Temperatur zwischen dem Mittenbereich der Bramme und dem Kantenbereich der Bramme entlang einer Ausgleichsstrecke mit einer Länge (LS) geführt wird, die sich ergibt zu:
- LS:
- Länge der Ausgleichsstrecke in m,
- HB:
- Dicke der Bramme in mm,
- vB:
- Gießgeschwindigkeit der Bramme in m/min,
- k:
- dimensionsbehafteter Koeffizient: k = 0,10.
- L S :
- Length of the compensation section in m,
- H B :
- Slab thickness in mm,
- v B :
- Casting speed of the slab in m / min,
- k:
- Dimensional coefficient: k = 0.10.
Damit wird die Strecke (und damit auch die Zeit) bereitgestellt, die für die Temperaturerhöhung an der Kante bzw. Seite und den Temperaturausgleich benötigt wird. Die Gleichung spiegelt die Problematik bei hohem Massenfluss wider.This provides the distance (and thus also the time) that is required for the temperature increase on the edge or side and the temperature compensation. The equation reflects the problem with high mass flow.
Vorzugsweise ist die Ausgleichsstrecke aber nicht länger als 120 %, maximal 200 %, des oben genannten Mindestwertes.However, the compensation distance is preferably not longer than 120%, maximum 200%, of the above-mentioned minimum value.
Die Bramme wird dabei bevorzugt entlang der Ausgleichsstrecke zwischen der Gießmaschine und der Walzstraße in ihrem Kantenbereich erwärmt.The slab is preferably heated in its edge region along the compensation path between the casting machine and the rolling mill.
Bevorzugt wird zumindest an einem Ort entlang der Förderrichtung der Bramme die mittlere Temperatur im Kantenbereich der Bramme gegenüber der mittleren Temperatur im Mittenbereich der Bramme um mindestens 20 K höher gehalten, vorzugsweise um mindestens 100 K.The average temperature in the edge area of the slab is preferably kept at least 20 K higher, preferably at least 100 K higher than the average temperature in the central area of the slab, at least at one location along the conveying direction of the slab.
Der Kantenbereich der Bramme wird bevorzugt über einen Bereich zwischen 40 und 150 mm vom seitlichen Brammenende entfernt frei von aufgespritztem Kühlmedium oder in reduzierter Kühlwirkung gehalten.The edge area of the slab is preferably kept free of sprayed-on cooling medium or with a reduced cooling effect over a range between 40 and 150 mm from the lateral slab end.
Die Spritzzonenbreite ist bevorzugt in vorzugsweise separat mit Kühlmedium beaufschlagbare schmale Breitenabschnitte, vorzugsweise zwischen 50 mm und 300 mm, besonders bevorzugt zwischen 50 mm und 100 mm, aufgeteilt, um eine optimale Anpassung der aktiven Wassermenge an unterschiedliche Brammenbreiten durchführen zu können.The spray zone width is preferably divided into narrow width sections which can preferably be acted upon separately by cooling medium, preferably between 50 mm and 300 mm, particularly preferably between 50 mm and 100 mm, in order to be able to optimally adapt the active water quantity to different slab widths.
Eine Weiterbildung sieht vor, dass eine Temperaturerhöhung zwischen der Temperatur der Bramme im Kantenbereich und der Temperatur der Bramme im Mittenbereich vom Beginn der Erstarrung der Bramme bis zum Ende der Durcherstarrung der Bramme vorzugsweise kontinuierlich vorgenommen wird.A further development provides that a temperature increase between the temperature of the slab in the edge area and the temperature of the slab in the middle area from the start of solidification of the slab to the end of solidification of the slab is preferably carried out continuously.
Demgemäß ist also ein Abstand zwischen der Gießmaschine und dem ersten Walzgerüst vorhanden, so dass sich ein Temperaturausgleich (ΔT < 80 °C) innerhalb der Bramme in Dicken- und/oder Breitenrichtung vor dem Walzgerüst mittels ausreichendem Abstand unter teilweisem Einsatz von Dämmhaubenstrecken und mittels Wärmeleitung innerhalb der Bramme einstellt.Accordingly, there is a distance between the casting machine and the first roll stand, so that there is a temperature compensation (ΔT <80 ° C) within the slab in the thickness and / or width direction in front of the roll stand by means of a sufficient distance with partial use of insulation hood sections and by means of heat conduction within the slab.
Die Erwärmung der Bramme erfolgt bevorzugt innerhalb einer thermischen Isolation.The slab is preferably heated within a thermal insulation.
Abhängig vom Gießprodukt oder abhängig vom eingestellten Massenfluss kann während einer Gießpause mindestens ein Segment der Gießmaschine durch seitliches Verschieben durch einen quer zur Fördererrichtung verschiebbaren thermisch isolierten Rollgang ersetzt werden.Depending on the cast product or depending on the set mass flow, at least one segment of the casting machine can be replaced by a lateral shift by a thermally insulated roller table that can be moved transversely to the conveying direction.
Die Vorrichtung zum Herstellen eines metallischen Bandes durch Endloswalzen, umfassend eine Gießmaschine zum Gießen einer Bramme und eine sich an diese in Förderrichtung der Bramme anschließende Walzstraße mit mindestens einem Walzgerüst, wobei die Gießmaschine eine Strangführung aufweist, in der Material der Bramme in Förderrichtung in Richtung Walzstraße geführt wird, wobei eine Anzahl von Kühlvorrichtungen vorhanden sind, mit denen die Bramme im Bereich der Strangführung durch Aufspritzen eines Kühlmediums gekühlt werden kann, wobei jede Kühlvorrichtung eine Anzahl Spritzdüsen aufweist, die in Richtung quer zur Förderrichtung nebeneinander angeordnet sind und über die das Kühlmedium auf das Material der Bramme ausgebracht werden kann, zeichnet sich erfindungsgemäß dadurch aus, dass Steuerungsmittel vorhanden sind, um eine mindestens eine der Kühlvorrichtungen so betreiben zu können, dass nur über eine Anzahl im Mittenbereich der Bramme angeordneter Spritzdüsen Kühlmedium auf die Bramme ausgebracht wird, während über die sich im Kantenbereich der Bramme befindlichen Spritzdüsen kein oder nur in vermindertem Umfang Kühlmedium auf die Bramme ausgebracht wird, wobei eine thermische Isolation im Bereich der Strangführung und/oder im Bereich zwischen der Strangführung und der Walzstraße angeordnet ist, die ausgebildet ist, nur den Kantenbereich der Bramme gegen Abkühlung zu schützen, wobei zum Ausgleich der Temperatur zwischen dem Mittenbereich der Bramme und dem Kantenbereich der Bramme zwischen der Gießmaschine und der Walzstraße wiederum die oben genannte Ausgleichsstrecke vorhanden ist.The device for producing a metallic strip by endless rolling, comprising a casting machine for casting a slab and a rolling mill adjoining it in the conveying direction of the slab with at least one rolling stand, the casting machine having a strand guide in the material of the slab in the conveying direction in the direction of the rolling mill is guided, with a number of cooling devices being provided with which the slab can be cooled in the region of the strand guide by spraying on a cooling medium, each cooling device having a number of spray nozzles which run in the transverse direction Are arranged next to each other to the direction of conveyance and via which the cooling medium can be applied to the material of the slab, is characterized according to the invention in that control means are provided in order to be able to operate at least one of the cooling devices in such a way that only a number in the central region of the slab Arranged spray nozzles cooling medium is applied to the slab, while no or only a limited amount of cooling medium is applied to the slab via the spray nozzles located in the edge region of the slab, with thermal insulation in the area of the strand guide and / or in the area between the strand guide and the Rolling mill is arranged, which is designed to protect only the edge region of the slab against cooling, wherein in order to compensate for the temperature between the central region of the slab and the edge region of the slab between the casting machine and the rolling train again the above-mentioned compensation stretch ke is present.
Bevorzugt ist eine Heizvorrichtung angeordnet, die ausgebildet ist, die Bramme entlang der Ausgleichsstrecke zwischen der Gießmaschine und der Walzstraße in ihrem Kantenbereich zu erwärmen.A heating device is preferably arranged, which is designed to heat the slab along the compensation section between the casting machine and the rolling mill in its edge region.
Die Zonenbreiten oder Abstände der Spritzdüsen in Breitenrichtung der Bramme betragen bevorzugt zwischen 50 und 300 mm, vorzugsweise zwischen 50 und 100 mm. Hierdurch ist es möglich, die Temperaturverteilung über der Breite positiv zu beeinflussen.The zone widths or distances of the spray nozzles in the width direction of the slab are preferably between 50 and 300 mm, preferably between 50 and 100 mm. This makes it possible to positively influence the temperature distribution across the width.
Die thermische Isolation in Richtung quer zur Förderrichtung kann verschiebbar angeordnet sein.The thermal insulation in the direction transverse to the conveying direction can be arranged displaceably.
Seitlich neben mindestens einem Segment der Strangführung oder der Gießmaschine kann ein quer zur Förderrichtung verschiebbarer thermisch isolierter Rollgang mit Wärmedämmung angeordnet sein.Laterally next to at least one segment of the strand guide or the casting machine, a thermally insulated roller table with thermal insulation that can be moved transversely to the conveying direction can be arranged.
Durch die vorgeschlagenen Maßnahmen wird insbesondere die Brammen- und damit die Bandqualität an der Kante verbessert. Die Erfindung geht von der Erkenntnis aus, dass eine normale Abkühlung im hinteren Bereich der Gießmaschine und beim anschließenden Weitertransport bis zum ersten Walzgerüst sich besonders negativ auf die Kante auswirkt. Um dies zu verhindern, ist vorgesehen, dass innerhalb der Gießmaschine durch gezieltes Wegschalten bzw. Reduzieren der Segmentkühlung im Bereich dicht vor den Brammenkanten diese wärmer gehalten werden.The proposed measures improve in particular the slab and thus the strip quality at the edge. The invention is based on the knowledge that normal cooling in the rear area of the casting machine and during subsequent transport to the first roll stand, this has a particularly negative effect on the edge. In order to prevent this, it is provided that within the casting machine by deliberately switching off or reducing the segment cooling in the area close to the slab edges, these are kept warmer.
Insbesondere wird der Brammenkantenbereich bevorzugt im Bereich zwischen 40 bis 150 mm von der Kante entfernt bis zur durch Erstarrung um mindestens 20 K, vorzugsweise um mindestens 100 K, wärmer gehalten als die Brammenmitte.In particular, the slab edge region is preferably kept in the range between 40 to 150 mm from the edge up to being warmer than the middle of the slab by solidification by at least 20 K, preferably by at least 100 K.
Hierdurch ist eine optimale Anpassung der aktiven Spritzdüsen an unterschiedliche Brammenbreiten gegeben.This ensures optimal adaptation of the active spray nozzles to different slab widths.
Durch die vorgeschlagenen Maßnahmen sowohl betreffend die Verfahrensweise als auch die Ausgestaltung der entsprechenden Vorrichtung ergeben sich zusätzlich zur Temperaturerhöhung im Kantenbereich der Bramme bzw. des Bandes Druckspannungen an der Kante, die sich bezüglich einer Kantenrissbildung positiv auswirken. Nach dem Bereich der Durcherstarrung und/oder auch erst ab hinter der Gießmaschine kann vorgesehen sein, die Bramme an der Ober- und Unterseite sowie an den Brammenkanten möglichst optimal durchgehend bis kurz vor dem ersten Walzgerüst weniger zu kühlen, zu dämmen, warm zu halten bzw. die Kante zu erwärmen.The proposed measures regarding both the procedure and the design of the corresponding device result in addition to the temperature increase in the edge region of the slab or the strip, compressive stresses on the edge, which have a positive effect on edge cracking. After the area of solidification and / or only from behind the casting machine, the slab on the top and bottom as well as on the slab edges can be provided Optimally less to cool, to insulate, to keep warm or to warm the edge until shortly before the first rolling stand.
Auf eine Entzunderung der Bramme beispielsweise vor dem ersten Inline-Gerüst wird optional vorzugsweise bei hochfesten Materialien verzichtet; dieser Bereich kann wärmegedämmt werden.Descaling of the slab, for example in front of the first inline stand, is optionally dispensed with, preferably in the case of high-strength materials; this area can be thermally insulated.
Der erfindungsgemäße vorteilhafte Effekt der Überhitzung der Kante im Erstarrungsbereich (im möglichst randnahen Bereich) und die anschließende Wärmedämmung der Bramme insgesamt oder alternativ nur an den Brammenkanten sowie ein Temperaturausgleich bzw. eine Temperaturerhöhung an der Brammenkante führt zu einer Qualitätssteigerung insbesondere im Falle hochfester Materialien aber auch bei weichen normalen Stählen oder Siliziumstählen.The advantageous effect according to the invention of the overheating of the edge in the solidification area (in the area as close to the edge as possible) and the subsequent thermal insulation of the slab as a whole or alternatively only at the slab edges as well as a temperature compensation or a temperature increase at the slab edge leads to an increase in quality, particularly in the case of high-strength materials for soft normal steels or silicon steels.
Vorteilhaft ergibt sich mit der vorgeschlagenen Lösung eine Verbesserung der Brammen- bzw. Bandqualität an der Kante, insbesondere bei hochfesten Materialien. Insbesondere können Brammenkantenrisse bei sich anschließender Umformung vermieden werden.The proposed solution advantageously results in an improvement in the slab or strip quality at the edge, in particular in the case of high-strength materials. In particular, slab edge cracks during subsequent forming can be avoided.
Es sei noch angemerkt, dass hier wahlweise und austauschbar von einem Strang oder einer Bramme gesprochen wird und darunter stets das bandförmige, gegossene Produkt zu verstehen ist, das sich an der jeweiligen Stelle der Anlage befindet; häufig wird im Bereich der Gießmaschine von einem Strang gesprochen, während der Begriff der Bramme zumeist oft erst hinter der Gießmaschine gebraucht wird. Diese Begriffe sind hier austauschbar zu verstehen.It should also be noted that here one speaks alternatively and interchangeably of a strand or a slab and always means the strip-shaped, cast product which is located at the respective point of the system; Often one speaks in the area of the casting machine, while the term slab is mostly only used behind the casting machine. These terms are to be understood interchangeably here.
In der Zeichnung sind Ausführungsbeispiele der Erfindung dargestellt. Es zeigen:
- Fig. 1
- schematisch einen Gießstrang bzw. eine Bramme, gesehen in Förderrichtung, wobei oberhalb des Gießstrangs bzw. der Bramme eine Kühlvorrichtung in Form eines Kühlbalkens mit einer Anzahl Spritzdüsen angeordnet ist, wobei eine Lösung nach dem Stand der Technik dargestellt ist,
- Fig. 2
- schematisch die
Darstellung gemäß Figur 1 , wobei hier eine erfindungsgemäße Ausführungsform dargestellt ist, - Fig. 3
- den Verlauf der Brammentemperatur gemittelt über der Dicke der Bramme bzw. des Gießstrangs an der Gießmaschine über der Brammenbreitenkoordinate,
- Fig. 4
- den Verlauf der Brammentemperatur gemittelt über die Dicke der Bramme bzw. des Gießstrangs über der Brammenbreitenkoordinate im Bereich der Gießmaschine und am ersten Inline-Walzgerüst für verschiedene Randbedingungen,
- Fig. 5
- die Ansicht eines Teils des Rollgangs zwischen Gießmaschine und Walzstraße oder der Strangführung der Gießmaschine, gesehen in Förderrichtung der Bramme, wobei eine einstellbare Wärmedämmung dargestellt ist,
- Fig. 6
- die Seitenansicht des Endes der Gießmaschine, wobei in diesem Bereich eine Wärmedämmung angeordnet ist,
- Fig. 7
- die
Seitenansicht gemäß Figur 6 , wobei hier statt der Wärmedämmung Segmentrollen angeordnet sind, und - Fig. 8
- gesehen in Förderrichtung der Bramme ein quer verschiebliches Element der Gießmaschine, wobei wahlweise eine Wärmedämmung oder eine Segmentrolle in den Förderbereich der Bramme eingeschoben werden kann.
- Fig. 1
- schematically a casting strand or a slab, seen in the conveying direction, one above the casting strand or the slab Cooling device is arranged in the form of a cooling beam with a number of spray nozzles, a solution according to the prior art being shown,
- Fig. 2
- schematically the representation according
Figure 1 , an embodiment according to the invention being shown here, - Fig. 3
- the course of the slab temperature averaged over the thickness of the slab or the casting strand on the casting machine over the slab width coordinate,
- Fig. 4
- the course of the slab temperature averaged over the thickness of the slab or the casting strand over the slab width coordinate in the area of the casting machine and on the first inline mill stand for various boundary conditions,
- Fig. 5
- the view of a part of the roller table between the casting machine and rolling mill or the strand guide of the casting machine, seen in the conveying direction of the slab, an adjustable thermal insulation being shown,
- Fig. 6
- the side view of the end of the casting machine, wherein thermal insulation is arranged in this area,
- Fig. 7
- the side view according to
Figure 6 , where instead of thermal insulation segment rollers are arranged, and - Fig. 8
- seen in the conveying direction of the slab, a transversely displaceable element of the casting machine, with either thermal insulation or a segment roller can be inserted into the conveying area of the slab.
In
Der Gießstrang 1 erstreckt sich in eine Richtung Q quer zur Förderrichtung F und hat einen Mittenbereich M im sowie einen Kantenbereich K.The
In
Damit wird es möglich, durch Aktivierung bzw. Deaktivierung einzelner Spritzdüsen 7 den Bereich des Strangs 1 in Richtung Q spezifisch zu definieren, der entweder durch Aufbringung von Kühlmedium 5 gekühlt oder durch Passivierung der entsprechenden Spritzdüsen 7 ungekühlt bleibt, so dass der Strang 1 im Strang- bzw. Brammenkantenbereich K wärmer bleibt.This makes it possible, by activating or deactivating individual spray nozzles 7, to specifically define the region of the
In
Demgemäß kann sofort gesehen werden, dass es mit der vorgeschlagenen Lösung nach
In den beiden
Die erfindungsgemäß angestrebte Überhitzung des Kantenbereichs K des Gießstrangs bzw. der Bramme 1, d. h. die Temperaturerhöhung des Kantenbereichs K relativ zum Mittenbereich M wird dabei vorteilhaft vom Beginn der Erstarrung bis zum Ende der Brammendurcherstarrung sukzessive gesteigert. Hierfür kann die Segmentkühlung (für die gesamte Gießmaschine oder auch nur im Bereich der in Förderrichtung vorderen oder hinteren Hälfte der Gießmaschine oder alternierend über Gießmaschinenlänge) sehr fein über die Breite aufgebaut sein, um für die verschiedenen Breiten den gewünschten Effekt optimal einstellen zu können.The overheating of the edge region K of the cast strand or
Dabei sind Zonenbreiten zwischen 50 und 300 mm und besonders bevorzugt zwischen 50 und 100 mm über der Breite im Bereich von 90 % von der minimalen Brammenbreite bis zur maximalen Brammenbreite vorgesehen, um kalte Brammenkanten zu vermeiden.Zone widths between 50 and 300 mm and particularly preferably between 50 and 100 mm above the width in the range of 90% from the minimum slab width to the maximum slab width are provided in order to avoid cold slab edges.
Die Zonen auf der Ober- und Unterseite sowie von Rolle zu Rolle können dabei um eine halbe (bzw. ganzzahlig geteilte) Düsenteilung versetzt angeordnet sein. Dabei werden vorteilhaft mengenregelbare Zwei-Stoff-Düsen als Spritzdüsen verwendet.The zones on the top and bottom and from roll to roll can be arranged offset by a half (or integer divided) nozzle pitch. Quantity-controllable two-substance nozzles are advantageously used as spray nozzles.
Die Wassermengen der einzelnen Spritzdüsen, die passiv bleiben sollen, im Brammenkantenbereich und neben der Bramme können dabei auf Null heruntergefahren werden, so dass nur wenig Düsenkühlwasser oder nur Luft (zum Schutz der Düsen) ausströmt. Unterstützt werden kann dieser Effekt durch den Einsatz trockener Segmente im hinteren Bereich der Gießmaschine. Zum Schutz der Düsen sowie der Düsenbalken können hierbei alternativ die deaktivierten Düsenbalken auch aus der Gießlinie heraus bewegt oder herausgeschwenkt werden.The water quantities of the individual spray nozzles, which should remain passive, in the slab edge area and next to the slab can be reduced to zero, so that only a little nozzle cooling water or only air (to protect the nozzles) flows out. This effect can be supported by the use of dry segments in the rear area of the casting machine. To protect the nozzles and the nozzle bars, the deactivated ones can alternatively be used Nozzle bar can also be moved out of the casting line or swung out.
Im eher randnahen Brammenkantenbereich ist natürlich die absolute Brammenkante etwas kälter als die Bramme in der Mitte bzw. die mittlere Temperatur über der Dicke in dem Bereich, weil teilweise Wasser über die Kante fließt und eine zweidimensionale Abstrahlung von Wärme erfolgt. Durch den erfindungsgemäß vorgesehenen überhitzten Brammenkantenbereich und die anschließende zusätzlich vorgesehene optionale Wärmedämmung erfolgt jedoch in vorteilhafter Weise dort ein weiterer Temperaturanstieg der absoluten Brammenkante infolge des Temperaturausgleichs bzw. der Wärmeleitung von der Mitte an die Kante bzw. seitliche Außenfläche.In the slab edge area near the edge, of course, the absolute slab edge is somewhat colder than the slab in the middle or the mean temperature over the thickness in the area, because water partially flows over the edge and there is a two-dimensional radiation of heat. Due to the overheated slab edge area provided according to the invention and the subsequent additionally provided optional thermal insulation, however, there is advantageously a further temperature rise of the absolute slab edge there due to the temperature compensation or the heat conduction from the center to the edge or the lateral outer surface.
In
Mit ausgezogener Linie ist in
Demgegenüber zeigt
In
Die Kurve a zeigt die Temperaturverteilung bis zur Brammenkante nach der Durcherstarrung, und zwar erzeugt durch eine reduzierte Segmentkühlung bzw. durch Wegschalten von Düsen im Kantenbereich. Die Kurve b stellt die Temperaturverteilung nach der Durcherstarrung in der Gießmaschine ohne erfindungsgemäße Überhitzung der Brammenkante dar. Zu erkennen ist, dass die Brammenkante deutlich kälter geworden ist.Curve a shows the temperature distribution up to the slab edge after solidification, which is generated by reduced segment cooling or by switching off nozzles in the edge area. Curve b shows the temperature distribution after solidification in the casting machine without overheating of the slab edge according to the invention. It can be seen that the slab edge has become significantly colder.
Die Kurve c zeigt die Temperaturverteilung bis zur Brammenkante am Einlauf des Inline-Gerüsts mit erfindungsgemäß überhitzter Brammenkante bzw. reduzierter Segmentkühlung in der Gießmaschine (ohne Dämmung). Die Kurve d zeigt die Temperaturverteilung bis zur Brammenkante am Einlauf des Inline-Gerüsts ohne Überhitzung der Brammenkante in der Gießmaschine (ohne Dämmung).Curve c shows the temperature distribution up to the slab edge at the inlet of the inline stand with the slab edge overheated according to the invention or reduced segment cooling in the casting machine (without insulation). Curve d shows the temperature distribution up to the slab edge at the inlet of the inline stand without overheating the slab edge in the casting machine (without insulation).
Dargestellt ist dann des weiteren mittels der Kurve e die Temperaturverteilung bis zur Brammenkante am Einlauf des Inline-Gerüsts nach der erfindungsgemäßen Vorgehensweise durch eine reduzierte Segmentkühlung im Brammenkantenbereich und einer Wärmedämmung an der Ober- und Unterseite der Bramme bzw. des Gießstrangs und/oder der Brammenkanten auf weiten Teilen der Strecke zwischen dem Durcherstarrungspunkt und dem ersten Inline-Gerüst.The curve e then also shows the temperature distribution up to the slab edge at the inlet of the inline stand according to the procedure according to the invention by means of reduced segment cooling in the slab edge area and thermal insulation on the top and bottom of the slab or the casting strand and / or the slab edges on large parts of the route between the solidification point and the first inline scaffolding.
Mit dem Pfeil f ist das erfindungsgemäß erzielbare Potenzial zur Erhöhung der Brammenkantentemperatur am Einlauf des Inline-Gerüsts angegeben.The arrow f indicates the potential that can be achieved according to the invention for increasing the slab edge temperature at the inlet of the inline stand.
Die Ausgleichsstrecke zwischen der Gießmaschine 2 und dem ersten Walzgerüst der Walzstraße 3 kann als Wärmedämmstrecke ausgeführt sein, bei der die Bramme umschlossen wird. Hierbei ist auch eine Ausbildung in Form einer beheizten Wärmedämmstrecke möglich. Möglich ist ferner eine unbeheizte oder beheizte Wärmedämmstrecke nur im Brammenkantenbereich und/oder der Einsatz eines Ofens bzw. einer Heizung. Im Falle eines Ofens bzw. einer Heizung kann ein Erwärmen über die gesamte Breite der Bramme (oder auch nur im Kantenbereich) vorgesehen sein, wobei im Kantenbereich eine erhöhte Heizleistung vorgesehen wird, um die Kante stärker zu erwärmen.The compensation section between the casting
In
Es können auch beispielsweise eine Brammenschere, eine Kaltstrangentsorgung, ein Zunderwäscher sowie andere Aggregate innerhalb der Ausgleichsstrecke angeordnet sein.For example, slab shears, cold strand disposal, a scale washer and other units can also be arranged within the compensating section.
Der wärmezudämmende Bereich kann nur hinter der Gießmaschine realisiert sein und/oder auch im hinteren Bereich der Gießmaschine bei einem oder mehreren Segmenten (im Horizontalteil).The heat-insulating area can only be realized behind the casting machine and / or also in the rear area of the casting machine in one or more segments (in the horizontal part).
Alternativ kann vorgesehen werden, den hinteren Bereich der Gießmaschine beispielsweise beim Gießen von weichem Kohlenstoffstahl mit speziellen Strangsegmenten zu betreiben. Diese Strangsegmente sind quer verschiebbar auf einem Rahmen angeordnet. Beim Gießen hochfester Materialien werden abhängig vom eingestellten Massefluss die ein oder zwei (ggf. auch mehr) Segmente durch wärmegedämmte Rollgangsgruppen ausgetauscht, in dem nun die notwendigen gedämmten Rollgangsgruppen in die Fertigungslinie geschoben werden. Dieser Austausch kompletter Segmentgruppen durch komplette gedämmte Rollgangsgruppen oder umgekehrt erfolgt vor dem Anguss bzw. zwischen zwei Gießsequenzen. Die Rollgangsgruppe bzw. der Rollgangsrahmen und die Segmentgruppe bzw. der Segmentrahmen sind miteinander verbunden. Entweder können also die Segmente oder ein gedämmter Rollgangsbereich in der Produktionslinie stehen.Alternatively, provision can be made to operate the rear region of the casting machine with special strand segments, for example when casting soft carbon steel. These strand segments are arranged on a frame so that they can be moved transversely. When casting high-strength materials, depending on the set mass flow, one or two (or possibly more) segments are replaced by thermally insulated roller table groups, in which the necessary ones are now exchanged insulated roller table groups are pushed into the production line. This exchange of complete segment groups by completely insulated roller table groups or vice versa takes place before the sprue or between two casting sequences. The roller table group or the roller table frame and the segment group or the segment frame are connected to one another. Either the segments or an insulated roller table area can be in the production line.
Dies ist in den
In
In
In
- 11
- Bramme (Gießstrang)Slab (casting strand)
- 22
- Gießmaschinecasting machine
- 33
- Walzstraßerolling train
- 44
- Strangführungstrand guide
- 55
- Kühlmediumcooling medium
- 66
- Kühlvorrichtung (Kühlbalken)Cooling device (chilled beam)
- 77
- Spritzdüsenozzle
- 7'7 '
- passive Spritzdüsepassive spray nozzle
- 88th
- thermische Isolationthermal insulation
- 99
- RollgangsrolleRoller conveyor roll
- 1010
- Ende der GießmaschineEnd of the casting machine
- 1111
- Treiberrolle / RollgangsrolleDriver roller / roller table roller
- 1212
- Segmentrollesegment role
- 1313
- verschiebbarer Rahmensliding frame
- FF
- Förderrichtungconveying direction
- Richtung horizontal und quer zur FörderrichtungDirection horizontal and transverse to the conveying direction
- MM
- Mittenbereich der BrammeCenter area of the slab
- KK
- Kantenbereich der BrammeEdge area of the slab
Claims (13)
- Method of producing a metallic strip by continuous rolling, in which firstly a slab (1) is cast in a casting machine (2) and subsequently the slab is continuously rolled in a rolling train (3) with at least one roll stand,
wherein the casting machine (2) comprises a strip guide (4) in which the cast slab (1) is guided in conveying direction (F) in the direction of the rolling train (3),
wherein the material of the slab (1) is cooled in the region of the strip guide (4) by spraying on a cooling medium (5) by means of a number of cooling devices (6) and
wherein each cooling device (6) comprises a number of spray nozzles (7) which are arranged adjacent to one another in a direction (Q) transverse to the conveying direction (F) and by way of which the cooling medium (5) is delivered onto the slab (1),
characterised in that
at least one of the cooling devices (6) is operated so that cooling medium (5) is delivered onto the slab (1) only by way of a number of spray nozzles (7) arranged in the centre region (M) of the slab (1), whereas no cooling medium (5) is delivered onto the slab (1) by way of the spray nozzles (7) disposed in the edge region (K) of the slab (1), or that cooling medium (5) is delivered onto the slab (1) by way of a number of spray nozzles (7) arranged in the centre region (M) of the slab (1), whereas cooling medium (5) is delivered only to a reduced extent onto the slab (1) by way of the spray nozzles (7) disposed in the edge region (K) of the slab (1),
wherein in the region of the strip guide (4) and/or in the region between the strip guide (4) and the rolling train (3) only the edge region (K) of the slab (1) is protected by means of a thermal insulation (8) against cooling, and
wherein the slab (1) between the casting machine (2) and the rolling train (3) is for equalisation of the temperature between the centre region (M) of the slab (1) and the edge region (K) of the slab (1) guided along an equalisation path with a length (Ls) resulting from:LS length of the equalising path in metresHB thickness of the slab in millimetresvB casting speed of the slab in metres/minutesk dimensional coefficient: k = 0.10. - Method according to claim 1, characterised in that the slab (1) is heated in its edge region (K) along the equalisation path between the casting machine (2) and the rolling train (3).
- Method according to claim 1 or 2, characterised in that at least at a location along the conveying direction (F) of the slab (1) the mean temperature in the edge region (K) of the slab (1) is kept higher by at least 20 Kelvins than the mean temperature in the centre region (M) of the slab (1).
- Method according to any one of claims 1 to 3, characterised in that the edge region (K) of the slab (1) over a region between 40 and 150 millimetres distant from the lateral slab end is kept free of sprayed-on cooling medium (5) or is kept in reduced cooling action.
- Method according to any one of claims 1 to 4, characterised in that the spray zone width is divided into narrow width sections, which can be separately acted on by cooling medium, between 50 millimetres and 300 millimetres so as to be able to undertake optimum adaptation of the active water quantity to different slab widths.
- Method according to any one of claims 1 to 5, characterised in that a temperature increase between the temperature of the slab (1) in the edge region (K) and the temperature of the slab (1) in the centre region (M) is undertaken from the start of hardening of the slab to the end of full hardening of the slab (1).
- Method according to any one of claims 2 to 6, characterised in that heating of the slab (1) is carried out within a thermal insulation (8).
- Method according to any one of claims 1 to 7, characterised in that depending on the cast product or depending on the set mass flow at least one segment of the casting machine (2) is, during a pause in casting, replaced, through lateral displacement, by a thermally insulated roller path displaceable transversely to the conveying direction (F).
- Device for producing a metallic strip by continuous rolling, comprising a casting machine (2) for casting a slab (1) and a rolling train (3), which is connected with the machine in casting direction (F) of the slab (1), with at least one roll stand, wherein the casting machine (2) comprises a strip guide (4) in which material of the slab (1) is guided in conveying direction (F) in the direction of the rolling train (3), wherein a number of cooling devices (6) by which the slab (1) can be cooled in the region of the strip guide (4) by spraying-on a cooling medium (5) is present and wherein each cooling device (6) comprises a number of spray nozzles (7) which are arranged adjacent to one another in a direction (Q) transverse to the conveying direction (F) and by way of which the cooling medium (5) can be delivered onto the material of the slab (1),
characterised in that
control means are present in order to be able to operate at least one of the cooling devices (6) so that cooling medium (5) is delivered onto the slab (1) only by way of a number of spray nozzles (7) arranged in the centre region (M) of the slab (1), whereas no cooling medium (5) is delivered onto the slab (1) by way of the spray nozzles (7) disposed in the edge region (K) of the slab (1), or that cooling medium (5) is delivered onto the slab (1) by way of a number of spray nozzles (7) arranged in the centre region (M) of the slab (1), whereas cooling medium (5) is delivered only to a reduced extent onto the slab (1) by way of the spray nozzles (7) disposed in the edge region (K) of the slab (1),
wherein a thermal insulation (8) constructed to protect only the edge region (K) of the slab (1) against cooling is arranged in the region of the strip guide (4) and/or in the region between the strip guide (4) and the rolling train (3) and
wherein present between the casting machine (2) and the rolling train (3) for equalisation of the temperature between the centre region (M) of the slab (1) and the edge region (K) of the slab (1) is an equalisation path having a length (Ls) resulting from:Ls length of the equalising path in metresHB thickness of the slab in millimetresvB casting speed of the slab in metres/minutesk dimensional coefficient: k = 0.10. - Device according to claim 9, characterised in that a heating device constructed to heat the slab (1) along the equalisation path between the casting machine (2) and the rolling train (3) in its edge region (K) is arranged.
- Device according to claim 9 or 10, characterised in the zonal widths or spacings of the spray nozzles in the width region of the slab (1) are between 50 and 300 millimetres.
- Device according to any one of claims 9 to 11, characterised in that the thermal insulation (8) is arranged to be displaceable in the direction (Q) transverse to the conveying direction (F).
- Device according to any one of claims 9 to 12, characterised in that a thermally insulated roller path, which is displaceable transversely to the conveying direction (F), with thermal insulation is arranged laterally adjacent to at least one segment of the strip guide (4) or the casting machine (2).
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102015219652 | 2015-10-09 | ||
DE102015223787.7A DE102015223787A1 (en) | 2015-10-09 | 2015-11-30 | Method and device for producing a metallic strip by endless rolling |
PCT/EP2016/074002 WO2017060428A1 (en) | 2015-10-09 | 2016-10-07 | Method and device for producing a metal strip by continuous rolling |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3359317A1 EP3359317A1 (en) | 2018-08-15 |
EP3359317B1 true EP3359317B1 (en) | 2019-12-18 |
Family
ID=58405908
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP16782023.2A Active EP3359317B1 (en) | 2015-10-09 | 2016-10-07 | Method and device for producing a metal strip by continuous rolling |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP3359317B1 (en) |
DE (1) | DE102015223787A1 (en) |
WO (1) | WO2017060428A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN109047696B (en) * | 2018-08-09 | 2023-09-08 | 中冶连铸技术工程有限责任公司 | Nozzle on-line adjusting method suitable for slab continuous casting machine and flow guiding device thereof |
CN112139463B (en) * | 2019-06-27 | 2022-03-11 | 上海梅山钢铁股份有限公司 | Secondary cooling nozzle type selection and arrangement method of continuous casting machine |
CN115228929A (en) * | 2022-07-29 | 2022-10-25 | 广西广盛新材料科技有限公司 | Temperature control method and device for strip steel production, terminal equipment and storage medium |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5832511A (en) * | 1981-08-21 | 1983-02-25 | Nippon Kokan Kk <Nkk> | Method and device for cooling thick steel plate |
IT1224318B (en) | 1988-05-26 | 1990-10-04 | Mannesmann Ag | PROCESS AND PLANT FOR THE CONTINUOUS PRODUCTION OF STEEL BELT |
IT1229749B (en) | 1989-05-17 | 1991-09-10 | Giovanni Arvedi | HEATING INDUCTION OVEN AND TEMPERATURE HOMOGENIZATION FOR THE LAMINATION OF THIN STEEL BELTS. |
DE10051959A1 (en) * | 2000-10-20 | 2002-05-02 | Sms Demag Ag | Method and device for continuous casting and subsequent shaping of a steel casting strand, in particular a casting strand with block format or pre-profile format |
DE102007016100A1 (en) * | 2006-09-01 | 2008-03-06 | Sms Demag Ag | Device for keeping hot slabs emerging from a continuous casting plant |
DE102007053523A1 (en) * | 2007-05-30 | 2008-12-04 | Sms Demag Ag | Device for influencing temperature distribution over width of slab or strip, particularly in one or multiple hot strip mill, has cooling device, which is provided with nozzles for applying cooling agent on slab or strip |
DE102008049537A1 (en) * | 2008-09-30 | 2010-04-01 | Sms Siemag Aktiengesellschaft | Method and apparatus for cooling a sliver or strip of a metal strand in a hot rolling mill |
DE102009019784A1 (en) * | 2009-05-02 | 2010-11-04 | Sms Siemag Ag | Apparatus and method for cooling a metal strip |
DE102010022003B4 (en) | 2009-06-19 | 2022-12-29 | Sms Group Gmbh | Vertical continuous caster |
EP2673099B1 (en) * | 2011-02-07 | 2017-12-06 | Primetals Technologies Austria GmbH | Method for regulating a temperature of a strand by positioning a movable cooling nozzle in a strand guide of a strand casting system |
EP2527061A1 (en) * | 2011-05-27 | 2012-11-28 | Siemens VAI Metals Technologies GmbH | Method for cooling a metallic strand and switching valve for intermittent opening and closing of a volume flow of a coolant medium |
DE102012201395A1 (en) | 2012-02-01 | 2013-08-01 | Sms Siemag Ag | Process for continuous casting of a metallic strand in a continuous casting plant and continuous casting plant |
-
2015
- 2015-11-30 DE DE102015223787.7A patent/DE102015223787A1/en not_active Withdrawn
-
2016
- 2016-10-07 EP EP16782023.2A patent/EP3359317B1/en active Active
- 2016-10-07 WO PCT/EP2016/074002 patent/WO2017060428A1/en active Search and Examination
Non-Patent Citations (1)
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None * |
Also Published As
Publication number | Publication date |
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EP3359317A1 (en) | 2018-08-15 |
WO2017060428A1 (en) | 2017-04-13 |
DE102015223787A1 (en) | 2017-04-13 |
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