EP2032287A2

EP2032287A2 - Device and method for producing a metal strip by continuous casting

Info

Publication number: EP2032287A2
Application number: EP07725479A
Authority: EP
Inventors: Jürgen Seidel; Peter Sudau; Jürgen Merz; Matthias Kipping
Original assignee: SMS Demag AG
Current assignee: SMS Siemag AG
Priority date: 2006-05-26
Filing date: 2007-05-23
Publication date: 2009-03-11
Also published as: DE102007022929A1; RU2393051C1; JP2009536581A; WO2007137748A2; RU2008144714A; KR101060124B1; MX2008013438A; TW200810860A; BRPI0710837A2; AU2007267402A1; AU2007267402B2; KR20090033173A; CA2650721A1; US20090314457A1; WO2007137748A3; AR061190A1; EG25141A

Abstract

The invention relates to a device for producing a metal strip (1 ) by continuous casting, using a casting machine (2) in which a slab (3) is cast. At least one milling machine (4) is arranged in the direction of transport (F) of the slab (3) behind the casting machine (2) in which at least one surface of the slab (3), preferably two surfaces which are opposite to each other, can be milled. According to the invention, in order to optimise the service life of the milling cutter of the milling machine, means (5) for cooling the milling cutter (6) are provided on or in the milling machine (4). The invention also relates to a method for producing a metal strip.

Description

Apparatus and method for producing a metal strip by

continuous casting

The invention relates to an apparatus for producing a metal strip by continuous casting, with a casting machine, in which a slab is cast, wherein in the conveying direction of the slab behind the casting machine at least one milling machine is arranged in the at least one surface of the slab, preferably two opposing surfaces , can be milled off. Furthermore, the invention relates to a method for producing a metal strip.

Continuous casting of slabs in a continuous casting plant can result in surface defects such as oscillation marks, casting powder defects or longitudinal and transverse surface cracks. These occur in conventional and thin slab casters. Depending on the intended use of the finished strip, therefore, the conventional slabs are partially flamed. Some slabs are generally flamed on customer request. The demands on the surface quality of thin slab plants are continuously increasing.

For surface treatment, flaming, grinding or milling are suitable.

The flame has the disadvantage that the melted material can not be melted down again without treatment due to the high oxygen content. During grinding, metal splinters mix with the grinding wheel dust, so that the abrasion must be disposed of. Both methods are difficult to adapt to the given transport speed. It therefore offers a surface treatment by milling. The hot milling chips are collected and can be packaged and smelted without processing without problems and thus add back to the production process. Furthermore, the cutter speed can be easily set to the transport speed (casting speed, finishing line feed speed). The device according to the invention of the type mentioned above therefore depends on the milling.

A device of the type mentioned above with a milling machine, which is arranged behind a continuous casting plant is known. Reference is made to CH 584085 and to DE 199 50 886 A1.

A similar device is also disclosed in DE 71 11 221 U1. This document shows the processing of aluminum strips using the casting heat, where the machine is connected to the casting machine.

An in-line removal from the surface of a thin slab (flames, milling, etc.) shortly before a rolling train at the top and bottom or only on one side has already been proposed, for which reference is made to EP 1 093 866 A2.

A further embodiment of a surface milling machine is shown in DE 197 17 200 A1. Here u. a. the variability of the milling contour of the milling device, which is arranged behind the continuous casting plant or before a rolling train described.

Another arrangement of an in-line milling machine in a conventional hot strip mill for processing a pre-strip and its embodiment is proposed by EP 0 790 093 B1, EP 1 213 076 B1 and EP 1 213 077 B1. In the surface treatment of thin slabs in a so-called CSP plant, depending on the surface defects detected, approximately 0.1 to 3.5 mm should be removed from the warm slab surface in the processing line ("inline") not to reduce too much, the thickest possible thin slab is recommended (H = 60 - 120 mm).

The surface treatment and the associated facilities are not limited to thin slabs, but can also be used inline behind a conventional thick slab caster and in slabs cast with a thickness of greater than 120 mm up to 300 mm.

The inline milling machine is generally not used for all products of a rolling program, but only for those where higher surface requirements are required. This is advantageous for application reasons and reduces the Fräsmaschinenabnutzung and is therefore useful.

It has been found that the service life of the mill or cutters with which the slab surface is milled in the milling machine, d. H. the service life of the or the cutter is not always satisfactory. This is related to the relatively high material load that the cutting material has to endure when processing the hot slab.

The present invention is therefore based on the object to improve an apparatus for producing a metal strip by continuous casting using a milling machine so that the disadvantages mentioned are reduced. So it should be created a device with which the or the milling tools are protected even with prolonged use time and processing of the hot slab so that longer life can be achieved.

The solution of this problem by the invention is characterized in that on or in the milling machine means for cooling a milling cutter, preferential example of a roller cutter, are provided. Various embodiments can be provided for this purpose:

The means for cooling the milling cutter can be designed as nozzles with which a cooling medium, preferably over the entire width, can be applied to the area of the cutting surfaces of the milling cutter. The nozzles can be arranged so that they apply the cooling medium to the cutter at a location remote from the slab on this. This can prevent excessive cooling of the slab. The cooling medium can be collected again in a collecting device.

The milling cutter may alternatively or additionally have in its interior at least one supply bore for cooling medium, which leads to the region of the cutting surfaces. In this case, it can have a concentric supply bore, from which at least one further supply bore leads to the region of the cutting surfaces.

In order to cool the slab by cooling medium as little as possible, which is often disadvantageous, it can be provided that adjacent to the cutter a collecting device for cooling medium is arranged. This can have a collecting trough for cooling medium. The collecting device may also have a half-side covering the cutter cover. The cover can - viewed in the direction of the Fräserdrehachse - be semicircular. Furthermore, a further development provides that, viewed in the conveying direction, a collecting trough is located in the front and / or rear end region of the cover.

A further alternative of the inventive concept provides that the means for cooling the milling cutter are designed as fans or blowers.

In order to use liquid cooling medium, but to prevent cooling of the slab, provides a further alternative or additive embodiment of Invention, that the means for cooling the milling cutter are formed as bores through which a cooling medium is passed through the interior of the milling cutter.

Preferably there are means for guiding the liquid cooling medium in a closed system. It is particularly preferably provided that the cooling medium is integrated in the cycle of the cooling system of the entire system.

The cooling medium may be water, an oil-water emulsion, air, spray or steam.

In the conveying direction directly in front of the milling machine, means for dimming the temperature distribution over the slab thickness and / or for cleaning the slab surface can be arranged. These may be nozzles for delivering a fluid to the slab.

In most cases, a cutter will be arranged for the processing of the top and the bottom of the slab. Each cutter can interact with a support roller arranged on the other side of the slab. In the conveying direction behind the milling machine usually a rolling train is arranged.

According to one embodiment, both means for cooling the milling cutter from the outside and means for cooling the milling cutter are provided from the inside.

It is preferably provided that the means for cooling the milling cutter for subcooling the slab surface are designed shortly before the milling process.

The means for cooling the milling cutter can be designed so that different amounts of coolant can be applied to the top and bottom of the slab. For the processing of the top and the bottom of the slab, a cutter can be arranged in each case.

Between the milling machine and in front of a rolling stand, a scale washer can be arranged. In this case, a preferred solution provides that the Zunw scrubber is single-row.

The method for producing a metal strip by continuous casting by means of a device of the type described is characterized in that before and / or behind the milling machine, the slab temperature is measured on the top and / or bottom of the slab, with a operated in a machine control process model in Depending on the determined temperatures, the amount of coolant is determined with which the slab is cooled.

In this case, the cooling of the slab on the top and bottom of the same can take place according to further education.

An alternative embodiment of this method provides that the slab is cooled and the amount of coolant for cooling the slab is determined by a process model operated in a machine control, wherein the process model determines the amount of coolant as a function of the chipping volume milled by the slab.

In this case, the determination of the amount of coolant can continue taking into account the slab transport speed and / or taking into account the temperature of the surface of the slab and / or taking into account the nature of the material of the slab.

The proposed solution makes it possible to significantly reduce the thermal load on the milling tool. It is therefore possible, much higher

To achieve service life, as with conventional milling machines for the use mentioned is the case. Even with longer-lasting use time, the milling tool is protected in the hot rolling process before the high slab surface temperature, resulting in the said advantage. So far, such life was not achievable, because only the usual lubricating emulsion or lubricating oil was used during milling.

In the drawings, embodiments of the invention are shown. Show it:

1 shows schematically the side view of an apparatus for producing a metal strip by continuous casting, in which a milling machine is used,

2 shows an enlarged detail of FIG. 1 showing the milling machine, FIG.

3 shows the arrangement according to FIG. 2 with a device for guiding the cooling medium in the closed system, FIG.

4 shows the side view of a milling cutter together with a support roller according to an alternative embodiment of the invention,

5 shows the side view of a milling cutter together with a support roller and chip transport device according to a further alternative embodiment of the invention,

Fig. 6a, the side view and

6b is a front view of a sectional view of a cooled milling cutter according to another embodiment of the invention,

7 is a side view of a cutter for the slab top together with support roller with a collecting device for cooling medium, 8a is a side view of a milling cutter with a collecting device for cooling medium according to an alternative to Fig. 7 embodiment of the invention,

8b shows a variant of FIG. 8a,

Fig. 9 shows the front view of a milling cutter with air cooling and water cooling of the bearings and

10a, the side view and

Fig. 10b is a front view of a sectional view of a cooled milling cutter according to another embodiment of the invention.

In Fig. 1, an apparatus for producing a metal strip 1 is shown by continuous casting. The metal strip 1 or the corresponding slab 3 is continuously cast in a casting machine 2 in a known manner. The slab 3 is preferably a thin slab. Immediately behind the casting machine 2, the slab 3 is subjected to a slab cleaning in a cleaning system 19. This is followed by a surface inspection by means of a surface measuring device 20. Subsequently, the slab 3 enters an oven 21, so that it can be kept at a desired process temperature. The oven is followed by a ferry 22.

Behind the furnace 21 or the ferry 22, the slab 3 enters a milling machine 4. In this case, two milling cutters 6 are arranged in the conveying direction F, with which the lower or the upper surface of the slab 3 are milled off can. The respective opposite surface of the slab 3, ie the top or the bottom thereof, is supported by support rollers 18. Behind the milling machine 4 is a descaling device 39, in this case in each case a single-row scale scrubber above and below the slab, and a rolling train, of the rolling stands 23 and 24 are shown.

Below the milling machine 4 is a collecting container 25 in which milled material is collected.

As can be seen in FIG. 2, means 5 for cooling the milling cutters 6 are provided in the milling machine 4. Here, these means 5 are designed as spray nozzles 7, which can be applied to those a suitable cooling medium (liquid or gaseous) over the width of the slab 3. This can be done directly or indirectly, a cooling of the cutter 6 and especially their cutting surfaces 8, which are indicated in Fig. 2 only very schematically.

It can be seen that spray nozzles 7 can be arranged so that the cutting surfaces 8 of the milling cutters 6 are sprayed directly. But it can also - as can be seen further - be provided that the discharge of cooling medium takes place on the slab 3, so far as an indirect cooling of the cutter 6 takes place. In Fig. 2, both possibilities are shown. In the latter case, therefore, the strip surface is cooled immediately before the cutter 6.

As indicated by the position 26 in Fig. 2, the support roller 18 is located slightly below or above the pass line to create a contact pressure on the support roller.

Furthermore, it is provided in the solution according to FIG. 2 that means 17 for cleaning the slab surface are arranged directly in front of the milling machine 4. This also slab cooling can be achieved, which protects the cutter 6 and otherwise the slab 3 pre-cleaned the cutters 6 supplies, which protects them. In the case of the means 17 designed as spray nozzles, the surface temperature can be trimmed from the top to the bottom of the slab. The trimming of the amount of water that is discharged through the nozzles 17 is carried out, depending on the measured temperature distribution before and / or behind the milling machine. 4

From Fig. 3 it is apparent that means 16 can be provided, with which a guiding of the cooling medium can take place in the closed system. These means 16 have a collecting container 27 for the preparation of the cooling medium, wherein preferably an emulsion or dispersion can be used. If necessary, the supply of fresh components of the cooling medium (oil or water, depending on the mixing ratio) take place, in which the cooling medium should be present.

FIG. 4 shows that the injection molding of the cutting surfaces 8 of the milling cutter 6 can also take place counter to the conveying direction F behind the milling cutter 6. Incidentally, a solution is shown here in which cooling of the milling cutter 6 is additionally provided, which will be described in more detail later in connection with FIG. 6. The cutting edge cooling can be designed here in the form of a simple bore. Alternatively, a spray nozzle may be provided at the exit point, which fans out the jet of the cooling medium (water jet) and directs it onto the cutting surface 8 of the milling cutter 6. Instead of a cutting-water cooling and cutting lubrication can be provided. A combination of milling cutter lubrication (milling cutter lubrication) from the inside and milling cutter cooling from the outside is also conceivable.

5, it is provided that injection molding (with liquid, in particular with water) or blowing (with gas, in particular with compressed air) of the cutting surfaces 8 of the milling cutter 6 counter to the conveying direction F behind the milling cutter 6 takes place. The direction of rotation of the cutter 6 is indicated by the arrow. In the conveying direction F in front of the milling cutter 6 here a liftable or pivotable chip transport unit 28 is provided, which can be moved in the direction of the double arrow, in the front region a baffle plate 29 is provided with fins. In the height of the slab 3, a heat-resistant conveyor belt 30 is arranged, which promotes chips from the milling process. The conveyor belt 30 can be cooled with a nozzle 31, which applies cooling medium to the conveyor belt 30. A scraper 32 directs the chips on the conveyor belt 30. By spraying with the mentioned medium, the chips remaining on the slab 3 between the scraper 32 and the cutter 6 are blown or conveyed onto the conveyor belt.

In the solution according to FIGS. 6a and 6b, the means 5 for cooling the milling cutter 6 are designed as follows: The milling cutter 6 is mounted on both sides by means of a respective bearing 33, in an axial end region of the milling cutter 6 a rotary coupling 34 is arranged with the cooling medium , for example in the form of water, is fed to the milling cutter 6 via a line 35 in the direction of the arrow. The milling cutter 6 is provided with a centric supply bore 9, from which further supply bores 10 extend at an angle to the radial direction and terminate in the area of the cutting surfaces 8 in such a way that cooling medium supplied via the conduit 35 reaches the cutting surfaces 8. It is therefore provided here an integrated coolant hole for cutting cooling, wherein cooling medium can be used both under high and at low pressure. For a reduction of the temperature stresses in the cutting surfaces 8 is possible.

Basically, the cooling medium not only desirably cools the mill 6, but also the slab 3, which is sometimes undesirable. In order to achieve an optimization in this regard, the embodiment of the invention according to FIG. 7 provides a collecting device 11, which catches the cooling medium after it has cooled the milling cutter 6, so that it does not cool the slab 3 in an excessive manner.

The collecting device is designed in the embodiment of FIG. 7 so that an arcuate cover 13 is used, which covers the cutter 6 approximately over a circumference of 180 °. So that the cooling medium after cooling of the cutter 6 as possible does not reach the slab, in the conveying direction in front of and behind the milling cutter 6 collecting troughs 12 from the sheet metal Cover 13 formed, which form a collecting volume for the cooling medium. This collecting troughs 12 may be formed as a channel with a slope for the flow of the cooling medium. The collecting troughs 12 can form a baffle plate 36 for chips in their region facing the slab 3. Otherwise undesirable in the collecting trough 12 reached chips can be flushed from there.

A simpler, but in some cases sufficient solution is shown in FIGS. 8a and 8b. Here, a simplified catching device 11 is provided, which consists of a sheet which is bent so that a collecting trough 12 is formed. In the illustrated embodiment, it is provided that the cooling means 5 are again embodied as nozzles 7, which guide a jet of cooling medium over the entire width of the milling cutter 6. Depending on the arrangement or alignment of the nozzle 7 and the cooling medium jet, the collecting device 12 may be arranged in the conveying direction F before (FIG. 8 a) or behind the milling cutter 6 (FIG. 8 b). The direction of rotation of the milling cutter 6 is again indicated by an arrow. The cooling medium, which is collected by the collecting device 11, can run off laterally next to the slab 3 into a sintering channel (see vertical arrow).

From Fig. 9 it is apparent that in cases where the cooling of the milling cutter 6 does not have to be excessively strong, cooling with air can also take place. Here, a fan 14 is arranged above the cutter 6, with which the cutter 6 is blown from above and thus cooled. Laterally - as in the other embodiments - nozzles 37 are arranged to cool the bearings 33.

A further alternative embodiment of the cooling of the milling cutter 6 is shown in FIGS. 10a and 10b. Here again the fact is taken into account that it may be undesirable to cool the slab 3 excessively by means of cooling medium. Therefore, it is provided in this solution that run inside the cutter 6, a number of holes 15 in the axial direction, by the cooling medium is promoted to cool the cutter 6 in this way. As in the case of the solution according to FIG. 6, a rotary coupling 34 is also provided here, via which cooling medium is conveyed from a line 35 into the bores 15. However, here the cooling medium only exits at the other axial end of the milling cutter 6 and drains into a sintering trough, so that the slab 3 is not cooled by the cooling medium. The holes 15 are - as seen in the embodiment - designed as blind holes; the outflow of the cooling medium takes place via drain holes 38 which attach at an angle to the bores 15.

In this respect, the considerations according to the invention can be summarized as follows:

With a long service life, the milling cutter 6 is subject to a high thermal load during the hot rolling process. It is advantageous for a cooling, so that the milling cutter, the bearings etc. are not too warm. In order to protect the milling tool 6 from the high surface temperature of the slab when the inline machining process continues for a relatively long time, according to one embodiment of the invention, a strip surface cooling is provided shortly before the milling engagement, whereby the temperature flow into the milling cutter edge is reduced.

Furthermore, the mill cutter is shielded from the warm surface. For IF steel or ULC steel, the target surface temperature for the short milling process, which corresponds to the transformation temperature, is aimed at. It is expected that the material softens briefly and sets a lower forming and thus cutting load.

The cutting surfaces 8 of the milling tool 6 are sprayed during circulation with lubricant (oil mist, oil-water mixture, etc.) to reduce the cutting force and thereby increase the service life of the milling tool. However, as is known in the prior art, the lubricant is not applied to the hot strip (as is the case when milling in the cold state). lent), but injected to the cutting edge, where the oil sticks and later acts during the cutting process.

In order to avoid milling off the hard scale layer and to increase the service life of the milling cutters, (low-pressure) descaling of the surface (see reference numeral 17 in FIG. 2) in front of the milling device 4 is envisaged.

The water volumes of the cooling or cleaning bars can be adjusted separately at the top and bottom, in order to combat or avoid a transverse curvature of the slab.

In front of and behind the respective milling cutter 6 chip removal or chip removal or chip removal areas (collecting funnels, baffles, suction pipes, transverse spraying, scrapers on the belt, etc.) can be provided in order to be able to practice either synchronous and countercurrent milling of the milling cutter 6.

In order to advantageously avoid cooling of the slab 3 during cooling of the milling cutter 6, it is possible to cool the rotary milling cutter 6 from the inside. The cooling water supply is preferably carried out laterally via a rotary coupling; the outlet is made open on the opposite side, so that the water can drain freely laterally into a sintering channel.

With external cooling of the milling cutter, the cooling water falls on the slab, especially on the upper side of the slab. In order to avoid an undesirable cooling effect of the slab, the water can be collected in a gutter. Here, cooling water is injected tangentially to the cutter blades and collected in the gutter behind it, so that it can drain laterally next to the belt in the sintering channel. At lower thermal stress and air cooling is conceivable to cool the mill 6 from the outside. This cooling can also be combined with the cooling of the roller mill bearing with water.

The amount of cooling medium for the cutter 6 is controlled in dependence on the milling removal or the machined volume.

Reference should be made to some particularly advantageous embodiment features:

As can be seen in FIG. 4, a cutting lubrication with emulsion with the aid of the supply bores 10 is simultaneously brought to the cutting surface 8 of the milling cutter 6 and the milling cutter 6 is cooled by external cooling by means of the nozzles 7.

Furthermore, according to FIG. 5, provision may be made for the chip transport to be supported by the nozzles 7 on the slab surface via the scraper 32 on the conveyor belt 30 and, at the same time, the slab surface and the milling cutter 6 to be cooled.

LIST OF REFERENCE NUMBERS

1 metal band

2 casting machine

3 slab

4 milling machine

5 Means for cooling the milling cutter

6 cutters

7 nozzle

8 cutting surface

9 supply hole

10 supply hole

11 collecting device

12 collection trough

13 cover

14 fan / blower

15 hole

16 Means for guiding the cooling medium in the closed system

17 Means for cleaning the slab surface and for influencing the temperature distribution over the slab thickness

18 support roller

19 cleaning system

20 surface measuring device

21 oven

22 ferry

23 rolling stand

24 rolling stand

25 collection container

26 position

27 collection container 28 chip transport unit

29 baffle plate

30 conveyor belt

31 nozzle

32 scrapers

33 bearings

34 rotary joint

35 line

36 baffle plate

37 nozzle

38 drainage hole

39 scale washer (single-row)

F conveying direction

Claims

claims:

1. Apparatus for producing a metal strip (1) by continuous casting, with a casting machine (2), in which a slab (3) is cast, wherein in the conveying direction (F) of the slab (3) behind the casting machine (2) at least one milling machine (4) is arranged, in which at least one surface of the slab (3), preferably two opposing surfaces, can be milled, characterized in that on or in the milling machine (4) means (5) for cooling a milling cutter (6) , in particular a roll mill, are provided.

2. Apparatus according to claim 1, characterized in that the means (5) for cooling the milling cutter (6) are designed as nozzles (7), with which a cooling medium to the region of the cutting surfaces (8) of the milling cutter (6) are applied can.

3. Apparatus according to claim 2, characterized in that the means (5) for cooling over the entire width of the milling cutter (6) extend.

4. Apparatus according to claim 2 or 3, characterized in that the nozzles (7) are arranged such that they apply the cooling medium to the cutter (6) at a location remote from the slab (3).

5. Device according to one of claims 1 to 3, characterized in that the cutter (6) in its interior at least one supply bore (9, 10) for cooling medium, which leads to the region of the cutting surfaces (8).

6. The device according to claim 5, characterized in that the cutter (6) in its interior a plurality of supply bores (9, 10) for cooling medium, which lead to the region of the cutting surfaces (8).

7. Apparatus according to claim 6, characterized in that the cutter (6) has a concentric supply bore (9) from which at least one further supply bore (10) leads to the region of the cutting surfaces (8).

8. Device according to one of claims 1 to 7, characterized in that adjacent to the cutter (6) a collecting device (11) is arranged for cooling medium.

9. Apparatus according to claim 8, characterized in that the collecting device (11) has a collecting trough (12) for cooling medium.

10. Apparatus according to claim 8 or 9, characterized in that the collecting device (11) has a cutter (6) half-covering cover (13).

11. The device according to claim 10, characterized in that the cover (13) viewed in the direction of the Fräserdrehachse is semicircular.

12. The apparatus of claim 10 or 11, characterized in that viewed in the conveying direction (F) in the front and / or rear

End region of the cover (13) is a collection trough (12).

13. The device according to claim 1, characterized in that the means (5) for cooling the milling cutter (6) as a fan (14) are formed.

14. The device according to claim 1, characterized in that the means (5) for cooling the milling cutter (6) are formed as bores (15) through which a cooling medium is passed through the interior of the milling cutter (6).

15. Device according to one of claims 1 to 14, characterized in that means (16) for guiding the cooling medium in a closed system are present.

16. The apparatus according to claim 15, characterized in that the cooling medium is guided integrated in the cycle of the cooling system of the entire system.

17. Device according to one of claims 1 to 16, characterized in that the cooling medium is water.

18. Device according to one of claims 1 to 16, characterized in that the cooling medium is an oil-water emulsion.

19. Device according to one of claims 1 to 16, characterized in that the cooling medium is air.

20. Device according to one of claims 1 to 16, characterized in that the cooling medium is spray mist.

21. Device according to one of claims 1 to 16, characterized in that the cooling medium is water vapor.

22. Device according to one of claims 1 to 21, characterized in that both means for cooling the milling cutter (6) from the outside and means for cooling the milling cutter are provided from the inside.

23. Device according to one of claims 1 to 22, characterized in that in the conveying direction (F) immediately before the milling machine means (17) are arranged to diverge the temperature distribution over the slab thickness, which are designed simultaneously for cleaning the slab surface.

Apparatus according to claim 23, characterized in that the means (17) for dimming the temperature distribution over the slab thickness are nozzles for applying a fluid to the slab (3).

25. Device according to one of claims 1 to 24, characterized in that the means (5, 7) for cooling the milling cutter (6) are designed for subcooling the slab surface shortly before the milling process.

26. Device according to one of claims 1 to 25, characterized in that the means (5) for cooling the milling cutter (6) are formed so that different amounts of coolant on the top and on the underside of the slab (3) can be applied ,

27. The device according to one of claims 1 to 26, characterized in that for the processing of the top and the bottom of the slab (3) each have a cutter (6) is arranged.

28. The device according to claim 27, characterized in that each cutter (6) cooperates with a on the other side of the slab (3) arranged support roller (18).

29. Device according to one of claims 1 to 28, characterized in that between the milling machine (4) and in front of a rolling stand (23, 24) a scale scrubber (29) is arranged.

30. The device according to claim 29, characterized the tinder scrubber (29) is single-rowed.

31. A method for producing a metal strip (1) by continuous casting by means of a device according to one of claims 1 to 30, which comprises a casting machine (2) in which a slab (3) is cast, wherein

Conveying direction (F) of the slab (3) behind the casting machine (2) at least one milling machine (4) is arranged, in which at least one surface of the slab (3), preferably two opposing surfaces, can be milled, characterized in that Slab (3) is cooled and before and / or behind the milling machine (4) the slab temperature on the top and / or bottom of the slab (3) is measured, with a driven in a machine control process model depending on the determined temperatures the amount of refrigerant is determined, with which the slab is cooled.

32. The method according to claim 31, characterized in that the cooling of the slab (3) takes place on the top and bottom.

33. A method for producing a metal strip (1) by continuous casting by means of a device according to one of claims 1 to 30, comprising a casting machine (2), in which a slab (3) is cast, wherein in the conveying direction (F) of Slab (3) behind the casting machine (2) at least one milling machine (4) is arranged, in which at least one surface of the slab (3), preferably two opposing surfaces, can be milled, characterized in that the slab (3) is cooled and the amount of coolant for cooling the slab (3) is determined by a process model operated in a machine control, the process model determining the amount of the coolant as a function of the cutting volume milled from the slab.

34. The method according to claim 33, characterized in that the amount of coolant continues to take into account the grain transport speed.

35. The method of claim 33 or 34, characterized in that the amount of coolant is further taking into account the temperature of the surface of the slab.

36. The method according to any one of claims 33 to 35, characterized in that the amount of coolant is further taking into account the nature of the material of the slab.