EP2155411A1

EP2155411A1 - Device for influencing the temperature distribution over a width

Info

Publication number: EP2155411A1
Application number: EP08734984A
Authority: EP
Inventors: Uwe BAUMGÄRTEL; Jürgen Seidel
Original assignee: SMS Siemag AG
Current assignee: SMS Group GmbH
Priority date: 2007-05-30
Filing date: 2008-04-03
Publication date: 2010-02-24
Anticipated expiration: 2028-04-03
Also published as: ES2400536T3; WO2008145222A1; US20100132426A1; JP2010527797A; RU2011139125A; CN101678419B; CA2679336A1; TW200906507A; DE102007053523A1; US9180504B2; CA2679336C; KR20090130234A; RU2488456C2; KR101138725B1; CA2761271A1; TWI442982B; RU2009148767A; EP2155411B1; JP5079875B2; CN101678419A

Abstract

The invention relates to a device (10) for influencing the temperature distribution over the width of a rolled material and/or a strip (11) or a slab, particularly in a hot strip mill, wherein at least one cooling device is provided and has nozzles (14) for applying a cooling means, wherein the nozzles (14) are arranged in such a manner or are controlled such that a cooling means is applied particularly to positions at which an increased temperature is detected. Furthermore, the invention relates to a device (10) for influencing the strip surface evenness by strip cooling, wherein according to the surface evenness of the strip (11), the cooling device is controlled in such a manner that the uneven areas are reduced or removed. In addition, with this invention the strip contour can be influenced in a specific manner, wherein the strip (11) or the slab is cooled over the width thereof in such a manner that the strip contour better approximates a desired target contour.

Description

Device for influencing the temperature distribution across the width

Technical area

The invention relates to a device for influencing the temperature distribution over the width, in particular of a strip, in particular in a hot strip mill, according to claim 1.

State of the art

When producing tapes, such as in particular in hot rolling mill, a strip is transported from the furnace to the reel and processed over this distance. The temperature of the strip and its temperature distribution, for example across the width, plays a decisive role in the processing and the strip quality resulting therefrom.

Especially when a high productivity of a plant or hot strip mill is to be achieved, the furnace, such as a walking beam oven, often the production bottleneck. This will cause the slabs to be warmed warm enough but they will not have a uniform temperature distribution because they have not remained in the oven long enough.

As a result, temperature distributions can arise, which are considered uneven across the width of the slabs. This may cause the conventional slabs to have an uneven temperature distribution when leaving the oven. As a rule, the surface and also the slab edge is warmer than the remaining slab. In a subsequent rolling in a roughing mill, the temperature profile is changed and the absolute band edge cools to the side and through the heat radiation Traversed by scale scrubber and stuffer in addition, so that before a final deformation, the temperature distribution is such that the average temperature decreases across the thickness decreases at the edge and towards the center, wherein in the vicinity of the edge a local temperature maximum arises. In this case, the warmer areas may be present approximately between 80 and 150 mm from the edge, which has an overall negative effect on the band contour and flatness. As a result of the temperature distribution which is so uneven, the subsequent rolling process causes a different flattening in the roll gap to be produced at the various finishing stands, and also a different work roll wear and thermal crown over the width of the strip. The result of this is profile anomalies, which are troublesome during the further processing of the strip and lead to less dimensionally stable strips, which is less desirable in terms of quality. Also, this is unavoidable by additional mechanical profile members, because the effects are very local.

In addition to the geometric disadvantages, as a result of the temperature differences, different microstructures or mechanical band properties can also arise over the bandwidth.

In addition to a non-uniform heating of conventional slabs in the oven, they are also observed with uneven temperatures behind a thin slab plant. If the temperature differences in the subsequent furnace are not completely equal, the above-described disadvantages such as profile anomalies, unevenness and different mechanical band properties over the bandwidth can also arise here.

Presentation of the invention, object, solution, advantages The object of the invention is to provide a device which allows improved processing of particular bands in hot strip mills and produces a higher product quality.

According to the invention the object is achieved with respect to the device with the features of claim 1. The device according to the invention for influencing the temperature distribution across the width of a slab or a strip, in particular in a single- or multi-stand hot rolling mill, wherein at least one cooling device is provided with nozzles for applying a coolant to the slab or the strip, wherein the nozzles are above the width of the slab. te arranged distributed and / or controlled so that in particular at positions at which an elevated temperature is determined, a coolant is applied.

A further embodiment of the invention provides for influencing the band flatness and band contour by partial cooling of the band. Essentially at the points where tape waves are detected, the tape is cooled in order to change the material strength in a targeted manner. Similarly, tape locations are cooled in order to specifically cause contour changes of the tape there. A contour influence usually takes place with thicker band and the flatness influence at smaller thicknesses. The principle of action is the same.

To determine the coolant distribution, it is advantageous if the width of the belt is divided into cooling zones, wherein for at least one, advantageously for all zones a nozzle of the cooling device is providable or arranged.

It is also expedient for the at least one nozzle or several nozzles to be adjustable in their position with respect to the width of the band. Furthermore, it is expedient in one embodiment, when the nozzles are arranged in pairs and advantageously symmetrically and in pairs with respect to the center of the belt.

In order not to require a separate width adjustment mechanism, width adjustment of the nozzles with respect to their nozzle positions may be provided by attachment to the slab or belt side guides.

In order to be able to flexibly perform the width adjustment of the nozzle positions, a separate adjusting device can also be used independently of one another for the right and left belt halves.

It is also advantageous if the nozzles are arranged next to each other, wherein each cooling zone is associated with a nozzle.

It is expedient if nozzles are arranged below and / or above the belt.

A targeted activation of the nozzles is supported by at least one measuring sensor, which detects the temperature distribution of the slab or slab - viewed over the width.

In a further embodiment, it is expedient if, furthermore, a control unit is provided which processes relevant input variables and determines and controls the quantity of coolant to be applied for the respective cooling zone and / or the cooling position.

Advantageous developments are described in the subclaims.

Brief description of the drawings The invention will be explained in more detail on the basis of an embodiment with reference to the drawings. Show it:

Fig. 1 representation of a temperature distribution of a slab based on

Fehlfarben;

Fig. 2 representation of a temperature distribution of a slab after the

Rollers based on false colors;

FIG. 3 shows a temperature distribution of a slab after rolling on the basis of false colors; FIG.

4 shows a profile of the mean strip temperature over the width of the

Bandes considered;

Fig. 5 shows a temperature profile, rolling force and profile shape across the width of the strip;

6 shows views of a device according to the invention;

7 shows a diagram for illustrating the temperature profile and arrangement of cooling zones;

7a shows a diagram for illustrating the interaction between flatness, temperature profile and control of cooling nozzles;

8 shows a view of a device according to the invention with cooling nozzles;

9 is a schematic representation of possible positions of a

Cooling device and temperature sensors within a hot strip mill; 9a is a schematic representation of possible positions of a

Cooling device and temperature sensors within a hot strip mill;

10 shows a schematic representation of a CSP system with possible positions of a cooling device and temperature measuring sensors;

10a is a schematic representation of a CSP system with possible positions of a cooling device and temperature measuring sensors;

10b a schematic representation of a CSP system with possible positions of a cooling device and temperature measuring sensors;

10c a schematic representation of a CSP system with possible positions of a cooling device and temperature measuring sensors;

11 shows a schematic representation of an alternative thin slab installation with possible positions of a cooling device and temperature measuring sensors;

11a shows a schematic representation of an alternative thin slab installation with possible positions of a cooling device and temperature measuring sensors;

11b is a schematic representation of an alternative Dünnbrammen- anläge with possible positions of a cooling device and temperature measuring sensors.

11c is a schematic representation of an alternative thin slab installation with possible positions of a cooling device and temperature measuring sensors; FIG. 12 shows a schematic representation of a thin strip casting rolling mill with possible positions of cooling devices and temperature measuring sensors; FIG.

FIG. 12a shows a schematic representation of a thin strip casting rolling mill with possible positions of cooling devices and temperature measuring sensors; FIG.

Fig. 13 is a schematic representation of a thin slab system with

Control unit for displaying a method for cooling a strip and / or a thin slab; and

Fig. 14 is a schematic representation of a thin slab system with

Control unit for displaying a method for cooling a strip and / or a thin slab.

Preferred embodiment of the invention

FIG. 1 shows a representation of one half of a slab 1, wherein a temperature distribution is made visible by means of false colors, the temperature being the warmer the brighter the color or gray level is. The slab 1 is already heated unevenly when leaving a conventional furnace of a hot strip mill, which is also due to a too short Ofenverweilzeit, which can be the result of high furnace utilization. The slab 1 is warmer at the surface and at the edge 1a or at the slab edge 2 than, for example, in the core 1b, which is shown dark. The slab 1 is therefore not thoroughly warmed up.

When rolling by means of a roughing the temperature profile of the slab 1 changes, so that the rolled slabs 1, for example, obtained a temperature profile corresponding to that in Figures 2 and 3. The band edge 2 Cools down by the rolling on and there is a hot zone 3, which is the band edge 2 adjacent. FIGS. 2 and 3 show the temperature distribution at the gray levels, the temperature being lower again the darker the gray level.

FIG. 4 shows a profile of the mean strip temperature as a function of the width of a preliminary strip, wherein it can also be clearly seen here that the temperature drops at the edge of the strip and that a lower temperature is also present inside. In a zone adjacent to the edge, the highest average temperature is present.

FIG. 5 shows, in three diagrams arranged one below the other, a profile of the mean temperature, a rolling force and the profile shape as a function of the width of the strip or slab 1. The upper part of the figure shows the course of the average temperature as a function of the width, with different temperatures - Adjusting 4.5 temperature profiles at different points of the hot strip mill (furnace, within the finishing train).

Due to the lowered temperature at the edge, a reduced rolling force 6 is caused in the region of the maximum temperature near the edge, because at the location of the highest temperature, the material is also usually the softest.

This results in an uneven profile shape (band contour), wherein a Profilanomalie 8 with a smaller thickness and a shoulder with bead 9 arise in the region of the highest temperature. Superimposed on this temperature effect with the effect of the roll bending or the effect of the actuators, which produce a decrease in thickness from outside to inside, see Figure 7. Figures 1 to 5 show for an application example the effect of uneven temperatures across the width.

FIG. 6 shows in the upper picture a schematic view of a device 10 according to the invention for cooling a thin slab, a pre-strip or a band 11. The band 11 is guided laterally by adjustable side guides 12 or lateral guidance means provided for this purpose. For this purpose, the side guides 12 are made laterally adjustable along the direction of the arrow 13. For cooling the slab or strip 11, cooling elements 14, such as cooling nozzles, are provided, which can be positioned at the location at which the highest temperature or high temperatures of the strip can be measured or expected, so that this area or these areas can be cooled separately. Thus, a main cooling region 14a defined on the basis of the temperature distribution can be fixed and additionally cooled by means of a coolant, such as, for example, cooling water. The cooling water can be conducted to the nozzles 14, for example, by means of hoses 15, wherein the hoses 15 can be formed or shielded against the high ambient temperature. In the lower picture, the device is shown in a side view. In this case, the belt is transported by means of the rollers and at the same time the belt is partially cooled by means of a coolant, such as cooling water or cooling air, at designated positions. It is advantageous if the cooling elements, such as nozzles, are provided in the region of an adjustable lateral guide. It is also possible to provide one or more nozzle groups instead of individual nozzles, so that the coolant can also be distributed over the tape over a wider area.

Furthermore, it can be seen that nozzles 14 are arranged above and below the belt so that it can be cooled both from below and / or from above.

Furthermore, it is particularly advantageous if the coolant quantity depends on a target variable (eg the temperature distribution, target contour, flatness), or of other process parameters, such as the kiln drawing time, width, width reduction etc. at the top and / or at the bottom individually is adjustable so that an optimized cooling of the corresponding band ranges can be done. If the temperature distributions of the strip across the width are not always reproducibly the same, an individual distribution of the nozzles can be provided.

FIG. 7 shows in the upper picture a temperature distribution of a band which is not distributed symmetrically. As can be seen, different at or near the two edges. wide ranges of elevated temperature, wherein in the middle band range also an area of elevated temperature can be found. The temperature profile behind the caster and / or behind the roughing stand and / or behind the furnace is shown in the upper curve 20 and the temperature profile behind the finishing line in the lower curve 21 is shown. Furthermore, the dot-dash lines 22, 23 are the desired or target values of the temperature distribution. Line 27 represents an average within a zone i.

Considering the unevenly distributed temperature maxima across the width of the belt, the arrangement of the nozzles is chosen. For this purpose, the lower figure of Figure 7 shows an arrangement of nozzles at the points at which the temperature is excessive compared to the desired value. Thus, a nozzle 24 is arranged in the region of the left-hand edge of the band, two nozzles 25 are arranged in the central region, and three nozzles 26 are provided in the region of the right-hand band edge. Instead of the number of nozzles, the amount of coolant 28 which is sprayed onto the belt can also be correspondingly distributed, so that a comparable coolant quantity distribution is present. The figure 7 below thus shows a multi-zone cooling, in which the respective zones are individually adjustable for cooling.

FIG. 7a shows, for another application example in the upper diagram, a distribution of the wave height or unevenness of a band as a function of the width of the band. In this case clearly two maxima 100,101 can be recognized. In the second diagram from above, the deformation of the rolling body of a work roll as a result of the strip cooling can be seen, wherein the contour in the loading rich of the arrows 102,103 can detect a change in the roll gap, which can be seen at the positions of the maxima of the upper image. The third diagram from the top shows the specific rolling force as a function of the width, again showing maxima as a function of the width at the same point. The fourth diagram from the top shows a temperature distribution of a band that is not evenly distributed. This figure shows, for an alternative case study, schematically the operating principle of the invention, according to which a targeted strip cooling, see the lower diagram, is carried out at such locations, where a detected unevenness is detected, so that improved planarity is achieved behind the rolling line. By cooling the belt in front of and / or within the rolling mill at specifically selected areas across the width of the belt, improved flatness of the belt can be achieved. The band ranges that are unplaned are usually cooled except for special cases. As a result, a higher deformation resistance sets in there as a result of the lower temperature, and thus an increased rolling force, as can be seen in Figure 7a in the middle diagram. The change of the flattening in the roll gap at the outlet stand or, if necessary, on several stands of a rolling train reduces or eliminates the unevenness. At a trim of the temperature of the belt, it is advantageous here, if the belt temperature tolerances are met. Thus, for example, when rolling austenitic stainless steel, it is possible to set or trim the strip temperature without affecting the mechanical strip properties over a wide range. FIG. 7a shows in the lower diagram the arrangement of the cooling nozzles 104 and thus a multizone cooling in which the respective zones 105 for cooling can be set individually. An arrangement of individual nozzles in, for example, the quarter wave range of the strip is also provided or possible.

Figure 8 shows a device 30 with an array of nozzles 31, 32 for cooling a slab or belt 33, the nozzles 31, 32 being provided under both the belt or slab and over the belt or slab. This allows the nozzles to add the belt or slab Spray on both sides with a cooling medium so that the strip or slab is cooled on both sides at the relevant points.

The nozzles 31, 32 are advantageously arranged in rows, so that adjacent nozzles can also be arranged overlapping. The nozzles also each have their own supply line 34, by means of which the coolant, such as water, can be brought to the nozzle 31, 32 before it is applied to the belt by means of the nozzle. The nozzles 31, 32 may advantageously be arranged stationary, wherein the nozzles 31, 32 may be connected by means of a holding frame or frame or the nozzles 31, 32 may be self-supporting, wherein the nozzles 31, 32 may also be interconnected.

Advantageously, the nozzles 31, 32 but also be positioned so that they can be kept adjustable in position over the width.

For example, the nozzles 31, 32 may also be arranged in groups or in pairs, for example in pairs symmetrically.

The nozzles can also have different nozzle cross sections, or several nozzles can be connected one behind the other in the material flow direction. For example, a desired different coolant quantity distribution ("water crown") can be represented, in which larger nozzles are used in the edge region of the nozzle beam than in the middle region and even smaller nozzles in the middle.

FIG. 9 schematically shows a device 40 for processing belts, such as a hot strip mill. The device 40 has a slab furnace 41 and two scale scrubbers 42,43. Furthermore, a first roughing stand 44 and second roughing stand 45 are provided, wherein the first roughing stand 44 can be formed as a continuous scaffold and the second roughing stand 45 can be designed as a reversing scaffold. Furthermore, side guides provided 46, such as in front of or behind the roughing stands and before the scissors 49 '. At the end of the road, the rolling means 47, such as a finishing train, are provided before the belt is cooled and wound on a reel, not shown. According to the invention, devices 48 for influencing the temperature of the strip are provided with nozzles. These are represented symmetrically by a rectangle with a line up or down. These can be arranged as shown in front of and / or after the roughing frames 44, 45 and / or before and / or after the shears 49 '. In addition, temperature measuring devices 49, such as temperature scanners, can be provided, which can be arranged after at least one of the roughing stands 44, 45 and / or after the rolling device 47. The devices 48 for influencing the temperature of the strip can be provided on the side guides in front of the roughing stands, such as continuous or reversing stand, and / or on the side guides in front of the shears or in front of the finishing line 47. Furthermore, within the finishing stand of the finishing mill 47 devices are provided. gene 48 for influencing the temperature with nozzle arrangements possible and advantageous. This can also apply to a plate mill in which such devices 48 can be provided to influence the temperature at the individual stages from the furnace to the heavy plate stand.

FIG. 9a schematically shows a further embodiment of a device 40 for processing belts, for example a hot strip mill. The device 40 has a slab furnace 41 and at least two scale scrubbers 42,43. Furthermore, a first roughing stand 44 and second roughing stand 45 are provided, wherein the first roughing stand 44 can be designed as a continuous scaffold and the second roughing stand 45 can also be designed as a reversing scaffold. Furthermore, side guides 46 are provided, such as in front of the roughing frames 44 and before the scissors 49 '. At the end of the road, the rolling means 47, such as a finishing train, provided before the tape is wound on a reel, not shown. According to the invention, devices 48 for influencing the temperature of the strip are provided with nozzles. These can be as shown in front of and / or be arranged after the Vorgerϋsten 44,45 and / or before and / or after the scissors. In addition, devices 48 for influencing the temperature of the strip may also be provided in the area of the finishing train 47 between individual stands. The devices for influencing the temperature 48 are advantageously provided on the side guides there. Furthermore, such devices can also be provided in the region of a pre-belt cooler 46 ', which can be arranged in front of the finishing train. For this purpose, preferably at least a part of the cooling device may comprise a belt zone cooling.

In addition, temperature measuring devices 49, such as temperature scanners, can be provided, which can be arranged after at least one of the roughing stands 44, 45 and / or after the rolling device 47. The devices 48 for influencing the temperature of the belt may be provided on the side guides in front of the roughing stands, such as continuous or reversing stand, and / or on the side guides in front of the scissors or in front of the finishing train 47. Furthermore, 47 devices 48 are within the finishing stand of the finishing train for influencing the temperature with nozzle arrangements possible and advantageous. This can also apply to a plate mill in which such devices 48 can be provided to influence the temperature at the individual stages from the furnace to the heavy plate stand.

FIGS. 10 and 10b each show a so-called CSP plant (Compact Strip Production) 50 with roughing stand, and FIGS. 10a and 10c each show a CSP plant 60 without roughing stand.

The CSP apparatus 50 of Fig. 10 has temperature measuring devices 51 disposed in front of the roller hearth furnace 50a and after the mold, and further, one located at the end of the finishing train with the rolling stands F1, F2, F3, F4, F5 and F6. The devices 52 for influencing the temperature with the nozzles for cooling the slab or the strip are advantageously before and / or after the roller hearth furnace after the mold and / or before the mold. gerϋst R1 and / or after the roughing stand R1 and / or before the finishing train to order. The system of FIG. 10b differs from the systems of FIGS. 10 and 10a merely in that further cooling devices 52 are provided in the finishing line 53 between the rolling stands F1 and F2, wherein within the finishing line 53 also further cooling devices 52 between also other rolling stands F1 F6 could be provided.

The CSP system 60 of Figure 10a has temperature measuring devices 61, in front of the roller hearth furnace 60a after the mold and at the end of the finishing train with the rolling stands F1, F2, F3, F4, F5, F6 and F7. The devices 62 for influencing the temperature with the nozzles for cooling the belt are advantageously to be arranged before and / or after the roller hearth furnace after the mold and / or in front of the finishing train. The system of Figure 10c differs from the system of Figure 10a only in that further cooling devices 62 are further provided in the finishing line 63 between the rolling stands F1 and F2 and in the cooling section 64, wherein within the finishing line 63 and other cooling devices 62, for example between other rolling stands F1 F6 could be provided. Furthermore, a temperature scanner 61 is provided at the end of the cooling section.

Figures 11, 11a, 11b and 11c each show an endless thin slab plant 70,80, in which the casting plant and the rolling mill are directly coupled together. Thus, a particularly short investment is achieved. In such systems, the time for a temperature compensation from the solidification of the melt to rolling is very short. Therefore, the provision of devices according to the invention for cooling a strip in such systems is particularly preferred, because a temperature compensation in the width direction with uneven temperature distribution without cooling devices can not be achieved. By Providence of the cooling devices, for example in the form of slab zone cooling or on the side guides can counter this can be actively worked and an adjustment of the temperature across the width can be actively carried out in different zones of strip production.

FIG. 11 and FIG. 11 b each show, in the system 70, temperature measuring devices 71 which after the casting machine 70a and the roughing stands V1, V2, V3 and / or after heating 71 a, such as a roller hearth furnace or an inductive heating, and / or are arranged after the finishing train with the rolling stands F1, F2, F3, F4 and F5. The devices 72 for influencing the temperature or for cooling with the nozzles for cooling the strip are advantageously inside and / or downstream of the casting machine, before and / or after heating, and before and / or also in the finishing line 73 between roll stands F1, ... F5 arranged. Furthermore, a cooling section 78 is provided for the band after the finishing line.

FIG. 11a and FIG. 11c show, in the system 80, temperature measuring devices 81 which follow the casting machine 83 and the furnace or holding furnace 84 or after the inductive heating 85 and / or after the finishing train 86 with the rolling stands F1, F2, F3 , F4, F5, F6 and F7 are arranged. The devices 82 for influencing the temperature or for cooling with the nozzles for cooling the slabs or the belt are advantageously within and / or after the casting machine 83, before and / or after the heating 84 or 85, as well as before and / or within the Finished line 86 between roll stands F1, ... F7 arranged. Furthermore, an inductive or other heating 87 is optionally provided in the finishing train 86 and after the finishing train a cooling section 88 for the band.

FIGS. 12 and 12a each show a thin-strip casting-rolling installation in which the casting installation 111 essentially consists of casting rolls 112. Along the tape guide, the temperature sensors or temperature scanners 113 are arranged to determine the temperature distribution of the tape. Furthermore, devices for belt zone cooling 114 are provided, which are provided at the beginning of the installation and / or before and / or after rolling stands 115 can. The rolling mill may consist of one or more rolling stands 115. Furthermore, a band heater 116 is provided, which can be provided after a leveler 118 or a driver 117. In such thin strip systems, it is so that the band contour can hardly be influenced. The rolling gap of the rolling stands must be adjusted according to the input profile. Accordingly, the multiply-mentioned actuators of the band zone cooling or the special local cooling at the entrance of the rolling stands or before or between rolling stands to improve the band flatness are advantageous. In this case, for example, a two-sided cooling is possible. Furthermore, even a one-sided cooling, as from above or from below, can be carried out with a thin band and with deliberately delimited effect of the cooling.

Comparable can also be made for a heavy plate line, in which after leaving the slab from the furnace to the heavy plate stand and in the downstream cooling section, a temperature control similar to the above can be performed. Also, a temperature influence over the width of the strip can also be carried out in a non-ferrous hot strip plant.

All applications serve the purpose of homogenizing the strip temperature across the width by suitable cooling of the slab or strip over the strip width and to improve or specifically influence the contour or flatness.

According to the invention, a flat jet nozzle, a conical nozzle, an air-water multi-fluid nozzle or a nozzle, such as a tube or tube arrangement of a laminar belt cooling can be used for cooling individual zones. Different nozzles can be used to cool different zones. Also, combined nozzle devices may be provided. The nozzles or the cooling zones over the width can also have a uniform or uneven distance from each other.

For example, a pre-strip cooling, a segment cooling in a continuous casting plant, an interstage cooling, a descaling, a nip cooling, a belt top or belt bottom cooling behind a looper or a cooling line can be used for cooling with the aforementioned objective and the corresponding properties or a combination of the above listed cooling devices. In this case, for example, the roll gap cooling can be carried out essentially shortly before or immediately before the roll gap by cooling the roll and / or the strip or the strip surface.

Furthermore, a cooling can also be provided in the case of a cold rolling train, so that the flatness of the strip can be influenced at least indirectly by the cooling.

In addition to an arrangement of nozzles for cooling on width-adjustable tape guides and nozzles may be provided such that they are to be arranged individually. Also, viewed over the width of the belt a plurality of nozzles are provided, in each case only the nozzles are driven and distribute coolant, which are needed for cooling. Overall, such a multi-zone cooling can be realized.

FIG. 13 schematically shows a thin slab installation 90 with a casting machine 91, a roller hearth furnace 92 or induction heating, a finishing line 93 with rolling devices F1 to F6 and with temperature sensors 94 and slab or belt cooling devices 95. The control unit 96 controls the belt cooling devices 95 on the basis of the data the temperature sensors 94, wherein further input variables are used for the determination of the coolant distribution and coolant quantity and the activation of the respective nozzles of the coolant aggregates: the casting thickness of the slab or of the strip, the pre-strip thickness, the width of the strip, the width reduction, the strip material, the furnace or the furnace type, for example identifiable by the furnace number, the transport speed, the measured temperatures across the width of the strip. After the cooling, for example, behind the finishing train or at another position, the effectiveness of the cooling can be further assessed, such as the relationship between the heat transfer coefficient and the amount of coolant, such as the amount of water, see block 97.

14 schematically shows a thin slab system 90 with a casting machine 91, a roller hearth furnace 92, a finishing mill 93 with rolling devices F1 to F6 and with temperature sensors 94 and belt cooling devices 95. The control unit 96 controls the belt cooling devices 95 on the basis of the data from the temperature sensors 94 and / or or the flat flatness sensor 98 and / or the strip profile measuring sensor 119, wherein furthermore the input variables mentioned in the last section can be used for the determination of the coolant distribution and coolant quantity and the activation of the respective nozzles of the coolant aggregates. Further downstream of the finishing train or at another position, the effectiveness of the cooling may be assessed, such as the relationship between the heat transfer coefficient and the amount of coolant, such as the amount of water, see block 97. In addition, in block 99, the unevenness and / or the band contour, ie the relationship of the contour and / or flatness change, and a necessary cooling amount and a necessary cooling distribution determined and taken into account. In this case, the flatness and the deviation from the target flatness can be determined, for example, optically or by means of a tensile stress distribution. Furthermore, the band contour can be measured by the profile measuring sensor and thus the deviation of the measured band contour from the target contour can be calculated.

Not only a learning, adaptive, preset model for determining the amount of water and its distribution can be assumed, but also it Control circuits can also be provided by means of which the set target values or target functions are regulated with the use of measured variables. For example, a temperature control loop can be provided, by means of which a measured strip temperature distribution, for example, behind a rolling train and / or a cooling line is used to control the cooling zones with regard to their cooling quantity and cooling quantity distribution in order to achieve a substantially homogeneous temperature distribution of the strip.

In the calculation of the temperatures of the strip and the heat flows for determining the cooling medium quantity and distribution can also be used a method which takes into account the heat flows within the slabs or slabs. Also can be considered in this method, how effective or effective the cooling.

From the data of the temperature sensors or temperature scanners - the temperature across the width considered, the width of the band is divided into cooling zones and the cooling zones is assigned a temperature. The cooling method evaluates the available data and determines, depending on the input variables and with the knowledge of the cooling effect, which nozzles are activated or deactivated and which coolant quantity is to be adjusted at which nozzle, so that a substantially homogeneous temperature distribution results.

In addition, a control loop can be provided, by means of which the band flatness is included in order to alternatively reach the end by suitable coolant distribution as possible a flat band.

In addition, it is also possible to provide a control circuit which takes into account the band contour in order to come closer to the target band contour (for example a parabola) as a further alternative by means of suitable coolant distribution. LIST OF REFERENCE NUMBERS

1 slab

1a edge

1 b core

2 band edge

3 warm zone

4 temperature profile

5 temperature profile

6 rolling force

7 thickness decrease

8 profile anomaly

9 bead

10 device for cooling

11 thin slab, pre-strip or ribbon

12 side guide

13 direction

14 cooling element, such as nozzle

14a main cooling area

15 hose

16 roll

20 curve

21 curve

22 line

23 line

24 nozzle

25 nozzles

26 nozzles

27 Average of the temperature of a zone

28 Coolant quantity

30 device 31 nozzles, jet

32 nozzles, jet

33 volume, slab or opening band

34 supply line 40 device 41 slab furnace

42 scale washer

43 scale washer

44 Vorgerüst

45 Vorgerüst 46 Side guide

46 'Vorbandkühler

47 rolling device, finishing mill

48 Device for influencing the temperature

49 Temperature measuring device 49 'Scissors

50 CSP plant 50a Roller hearth furnace

51 temperature measuring device

52 Device for influencing the temperature 53 finishing mill

60 CSP plant 60a Roller hearth furnace

61 temperature measuring device

62 Device for influencing the temperature 63 Finished line

64 cooling section

70 thin slab plant 70a casting machine

71 Temperature measuring device 71a heating

72 Device for influencing the temperature 73 finishing mill

78 cooling section

80 thin slab plant

81 Temperature measuring device

82 Device for influencing the temperature 83 Casting machine

84 holding oven

85 heating

86 finishing mill

87 Heating 88 Cooling section

90 thin slab plant

91 casting machine

92 roller hearth furnace

93 finishing line 94 temperature sensors

95 belt cooling device

96 control unit

97 block for control

98 Band flatness sensor 99 block for control

100 maximum in the wave height or band flatness

101 Maximum in wave height or band flatness

102 Deformation in the area of the arrows

103 deformation in the area of the arrows 104 nozzles

105 zones

111 casting plant

112 casting roll

113 Temperature sensor, temperature scanner 114 Band zone cooling, device for influencing the temperature 115 rolling stand

116 band heating

117 drivers

118 levels

119 Band profile measuring sensor

Claims

claims

1. A device for influencing the temperature distribution across the width of a slab or a strip (33), in particular in a single- or multi-stand hot rolling mill, wherein at least one cooling device is provided with nozzles (14) for applying a coolant to the slab or on the belt (33), wherein the nozzles (14) are distributed over the width and / or controlled such that in particular positions at which an elevated temperature can be determined, a

Coolant is applied or that depending on an observed flat flatness state, a coolant is applied controlled such that the unevenness is reduced or eliminated, or that depending on a measured band contour, a coolant is applied controlled so that the band contour of a desired target contour comes closer.

2. Apparatus according to claim 1, characterized in that at least one measuring sensor (51) is present, which detects the temperature distribution of a slab or a belt - viewed over the width of the slab or the belt - detects, so that depending on the sensor signal, the nozzle of Cooling device is controlled.

3. Apparatus according to claim 1, characterized in that at least one measuring sensor (98) is present, which detects the unevenness of a band - viewed across the width of the belt - detected, in particular behind the rolling train, so that depending on the signal of the sensor to activating nozzles are selectable.

4. Apparatus according to claim 1, characterized in that at least one measuring sensor (119) is present, which detects the band contour - viewed over the width of the belt - detected, in particular behind the rolling train, so depending on the signal of the sensor to be activated Nozzles or zones of the cooling device are selectable.

5. Apparatus according to claim 1, 2, 3 or 4, characterized in that the width of the slab or belt (33) is divided into cooling zones, wherein for at least one, advantageously for several or for all zones in each case at least one nozzle (14 ) of the cooling device is providable or provided.

6. Device according to one of the preceding claims, characterized in that the at least one nozzle or a plurality of nozzles (14) in their position with respect to the width of the slab or the belt (33) are adjustable.

7. Device according to one of the preceding claims, characterized in that the nozzles (14) in pairs and advantageously symmetrically and in pairs with respect to the center of the belt (33) are arranged.

8. The device according to claim 7, characterized in that the width adjustment of the nozzle or the nozzle position is effected by attachment to a slab or belt side guide.

9. Apparatus according to claim 7, characterized in that that the width adjustment of the nozzle or the nozzle position by means of an adjusting device for the right and / or left slab or belt half takes place independently of each other.

10. The device according to claim 9, characterized in that the adjusting devices are each separate.

11. Device according to one of the preceding claims, characterized in that the nozzles (14) are arranged side by side, wherein preferably each cooling zone at least one nozzle (14) or more cooling zones is associated with at least one nozzle.

12. The device according to claim 11, characterized in that the nozzles or the cooling zones over the width have a uniform or uneven distance from each other.

13. The apparatus according to claim 11, characterized in that the nozzle shapes or nozzle types over the width with respect to coolant quantity and / or spray pattern are formed differently.

14. Device according to one of the preceding claims, characterized in that nozzles (14) are arranged below and / or above the belt.

15. Device according to one of the preceding claims, characterized in that a control unit (96) is furthermore provided which is relevant

Processed input variables and determines the amount of coolant to be applied for each cooling zone and / or the cooling position and controls.

16. The apparatus according to claim 15, characterized in that a control loop is provided which, depending on the measured temperature distribution of the belt or the slab, drives the nozzles to be used for cooling.

17. The device according to claim 15, characterized in that a control loop is provided which, depending on the measured Bandunplanheit before the last transformation such cools that improves the band flatness after the last transformation.

18. The apparatus according to claim 15, characterized in that a control loop is provided which, depending on the measured strip contour, the rolling stock before the last transformation so cool that the band contour of the desired target contour comes closer.

19. Use of a cooling device according to at least one of the preceding claims, characterized in that the device for temperature uniformity across the width or for contour or flatness improvement on at least one of the following facilities of a rolling mill: i. Segment cooling in a continuous casting plant, ii. Thin slab cooling behind a continuous casting plant, iii. Cooling a casting belt behind the casting plant, iv. Vorbandkühlung in a conventional hot strip mill, v. Intermediate cooling, vi. Roll gap cooling, vii. Cooling section, viii. Lateral guidance in front of and / or behind a roughing stand and / or a finishing stand, ix or a combination thereof.