KR101060123B1 - Manufacturing apparatus for producing metal strip by continuous casting - Google Patents

Abstract

The present invention relates to a manufacturing apparatus for producing a metal strip 1 by continuous casting while using a casting machine 2 on which a slab 3, preferably a thin slab is cast. According to the device here, at least one milling machine 4 is arranged behind the casting machine 2 in the conveying direction F of the slab 3. Inside this milling machine two surfaces, at least one surface of the slab 3, preferably located opposite one another, can be milled. In order to keep the temperature loss low during slab processing or machining, according to the invention at least one milling cutter 5, 6 of the milling machine 4 preferably has the entire milling machine 4 in the slab. It is arrange | positioned so as to be displaceable in the direction Q which makes a transverse direction with respect to the conveyance direction F of (3). The present invention also relates to a manufacturing method for producing the metal strip.

Slab, casting machine, milling machine, temperature loss, milling cutter, feed direction, transverse direction.

Description

Manufacture apparatus for manufacturing metal strip by continuous casting {DEVICE FOR PRODUCING A METAL STRIP BY CONTINUOUS CASTING}

The present invention relates to a manufacturing apparatus for producing a metal strip by continuous casting while using a casting machine in which a slab, preferably thin slab, is cast. In the case of the manufacturing apparatus of the present application, at least one milling machine is arranged behind the casting machine in the conveying direction of the slab, in which at least one surface of the slab is preferably located at opposite sides of the slab. Milling can be cut. The invention also relates to a manufacturing method for producing a metal strip.

In the continuous casting of slabs in a continuous casting machine, surface defects such as vibration traces, casting powder defects or surface cracks extending in the longitudinal and transverse directions may occur. Such surface defects occur in conventional thin slab casting machines. Therefore, in accordance with the respective purpose of use of the final strip, it is partially removed from the conventional slab. Many slabs generally have to be flawed according to customer requirements. In this regard, the demand for surface quality of thin slab casting lines continues to increase.

For surface machining, deseaming, grinding or milling cuts are provided.

The flaw removal has the disadvantage that the molten material cannot be melted again without treatment on the basis of the high oxygen content. During grinding, metal debris mixes with the grinding wheel dust and therefore has to deal with the abrasive powder. In the above two methods it is difficult to adjust to the specified feedrate.

Thus, a surface machining process through milling is provided. In other words, in this case the milling chips are collected and transported into bundles, completely melted again without treatment and fed back into the manufacturing process. In addition, the milling cutter speed can be simply adjusted to the feed rate (casting speed, finishing line feed rate). Therefore, the device of the invention having the form mentioned initially takes into account milling cutting.

BACKGROUND OF THE INVENTION A manufacturing apparatus of the first mentioned type, including a milling machine arranged behind a continuous casting machine, is known. Reference is made to CH 584 085 and DE 199 50 886 A1.

Similar devices are disclosed in DE 71 11 221 U1. This citation document shows that the machine is connected to the casting line and the aluminum strip is processed using casting heat.

It has also already been proposed that material removal of the surface of the thin slab in series in the upper and lower surfaces, or only on one side immediately before the rolling sequence (removal, milling, etc.). Reference is made to EP 1 093 866 A2.

Further embodiments of surface milling machines are known from DE 197 17 200 A1. In this case, in particular, the variability of the milling cutting contour of the milling apparatus arranged behind the continuous casting machine or in front of the rolling train is described.

Another arrangement and configuration of a tandem milling machine provided in a conventional hot rolling strip mill for processing pre strips has been proposed from EP 0 790 093 B1, EP 1 213 076 B1 and EP 1 213 077 B1.

In the surface machining of thin slabs in a so-called CSP system, about 0.1-2.5 mm on one side and on both sides should be removed from the hot slab surface depending on the surface defects detected in the machining line ("serial"). In order not to reduce the production too strongly, thick foil slabs as much as possible are recommended (H = 60 to 120 mm).

Tandem milling machines are not usually used for all products of rolling programs, but only for those products that require relatively higher surface requirements. This is desirable in terms of yield, which reduces milling machine wear and is therefore of significant value.

Tandem milling machines require mounting space. Slab temperature loss in the area of the machine leads to processing inconvenience. This also applies when used after the casting machine. This is because the casting speed (mass flow) is usually low. And temperature loss is undesirable even in front of the finishing line. This is because the final rolling temperature must be adjusted high in order for the strip discharge rate discharged from the finishing line to be satisfactorily achieved, especially when the strip is relatively thin.

It is therefore an object of the present invention, in a manufacturing apparatus and method for producing a metal strip through continuous casting, using a milling machine, in order to enable optimum slab processing even under various process technical requirements. Is to improve it. In particular, the temperature loss during slab processing and processing can be kept low.

The solution of this object according to the invention is characterized in that at least one milling cutter of the milling machine is preferably arranged so as to be displaceable in a direction transverse to the conveying direction of the slab.

Thus, the system's heat savings can be optimized as will be discussed in more detail later.

In this regard the direction transverse to the conveying direction is preferably oriented horizontally.

At least one lid member is provided which is displaceable in a direction transverse to the conveying direction while having thermal insulation properties. In this regard, thermal insulating materials have thermal stability. For example, a thin plate having a relatively thick thickness or a plate made of a refractory nonferrous metal material may satisfy the above object.

In this regard it may also be formed in such a way that at least one lid member can be heated. In other words, in this case, the lid member has the function of a furnace.

The furnace can be arranged in front of the milling machine in the feed direction. In order to machine the top and bottom of the slab, respective milling cutters can be arranged. In this connection the two milling cutters are preferably arranged spaced apart from each other in the feed direction. In addition, in accordance with what has been proven to be desirable, each milling cutter interacts with a support roller disposed on the other side of the slab.

The furnace may be arranged between two milling cutters which respectively machine the top and bottom of the slab.

A descaling system can be arranged behind the milling machine in the conveying direction. In this regard a furnace can be arranged between the milling machine and the descaling system.

According to an alternative embodiment of the invention, the descaling system is arranged side by side with the milling machine at the same height as viewed in the feed direction, whereby the milling machine and the descaling system move in a direction transverse to the feed direction. By means, it can be alternately drawn in or transferred out of the processing line.

At least one rolling train is arranged behind the milling machine in the conveying direction.

The milling machine can be separated into two part machines spaced apart from one another, for example milling, cutting different surfaces of the slab.

In addition, the milling machine or its components are preferably integrated into the descaling system, which allows for a compact configuration.

The method of operation for operating the metal strip manufacturing apparatus through continuous casting is based on a simulation model operated in the machine control apparatus, depending on whether the milling machine is used before the slab rolling process, depending on the measured or preset surface properties of the slab. Characterized in that it is determined. The simulation model is preferably a process model, or a so-called level-3-system known in the art as the process model.

Thereby an optimal manufacturing method can be provided automatically. In other words, in the case of surface critical products, the milling cutting process is performed before the rolling process, while in the standard product, the rolling process is performed without surface machining by milling cutting.

With the proposed solution according to the present application, it is possible to keep the temperature loss low during slab processing or processing, and to achieve an acceptable finishing line inlet temperature. This improves the quality of the production of slabs, in particular thin slabs.

The milling machine withdrawn from the processing line can generally be replaced by another functional member, with the descaling device preferably being considered. It is also possible, for example, to feed the furnace member into the machining line instead of the milling machine. As described, naturally, instead of the milling machine or the milling cutter, only the insulating member for suppressing the cooling of the strip may be drawn in.

It is also possible to implement the method of operation that is optimally set for the actual application case (preferably automatically) by the proposed method.

In this connection an acceptable finishing line inlet temperature is achieved.

Embodiments of the present invention are shown in the drawings.

1A is a schematic side view of the manufacturing apparatus in which a milling machine can be used in the manufacturing apparatus for manufacturing a metal strip through continuous casting.

FIG. 1B is a plan view schematically illustrating a manufacturing apparatus corresponding to FIG. 1A.

FIG. 2A is a side view schematically showing an apparatus for manufacturing a metal strip replaced with FIG. 1A.

FIG. 2B is a plan view schematically illustrating the manufacturing apparatus corresponding to FIG. 2A.

3 is an enlarged schematic view of a milling machine similar to FIG. 1 with an insulating member.

FIG. 4 is a side view of such a manufacturing apparatus in which an additional manufacturing apparatus is substituted for that of FIG. 1A, in which the milling cutting units are arranged spaced apart from each other and mill cut different surfaces of the slab.

FIG. 5 is a side view showing the manufacturing apparatus replaced with FIG. 4. FIG.

FIG. 6 is a side view of such a manufacturing apparatus in a further manufacturing apparatus replaced with FIG. 1A, with a furnace interposed between the milling machine and the rolling train.

<Description of main parts of drawing>

1: metal strip

2: casting machine

3: slab

4: milling machine

4 ': milling machine

4 ": milling machine

5: milling cutter

6: milling cutter

7: cover member

7 ': cover member

8: furnace

9: support roller

10: by

11: descaling system

11 ': descaling unit (descaling nozzle bar)

12: by

13: roll stand

14: roll stand

15: cleaning system

16: surface measuring device

17: Horizontal feed device

18: collection container

19: stand

20: profile measuring device

21: Descaling nozzle bar

22: table roller

F: feed direction

Q: transverse

1A and 1B show a manufacturing apparatus for producing a metal strip 1 through continuous casting. The metal strip 1 or the corresponding slab 3 are continuously cast in a known manner in the casting machine 2. The slab 3 is preferably a thin slab. Just behind the casting machine 2, the slab 3 is subjected to a slab cleaning process in the cleaning system 15. This is followed by a surface inspection by the surface measuring device 16. The slab 3 is then fed to the furnace 8, whereby the slab can be maintained at the desired process temperature. Following the furnace, a horizontal feeder 17 is arranged.

As can be seen from FIG. 1b, two strands are cast simultaneously, ie two parallel cast strands are provided.

Behind the furnace 8 or the transverse feeder 17 the slab 3 is fed to the milling machine 4. Inside this milling machine, according to this embodiment, two milling cutters 5, 6 (slightly spaced apart from each other in the conveying direction F) are arranged. The lower and upper surfaces of the slab 3 can thus be milled respectively by the milling cutters. Each opposite surface of the milled surface of the slab 3, in other words the upper and lower surfaces of the slab, respectively, is supported by support rollers 9.

A descaling system 11 is arranged behind the milling machine 4, by which the descaling system can be descaled from the strip surface. And behind the descaling system 11 the metal strip 1 finally reaches within the rolling sequence shown by the roll stands 13, 14.

At the bottom of the milling machine 4 is a collecting vessel 18 in which the milled material is collected.

In essence at least one (5 or 6) of the milling cutters of the milling machine 4, but preferably the entire milling machine 4 is transverse to the conveying direction F of the slab 3 ( Q) is arranged to be displaceable.

In other words, as best seen from FIG. 1B, the milling machine 4 is positioned at such a first position (shown in solid line) that it can be fed into the machining line to mill the slab 3. However, the milling machine 4 may also be arranged in such a second position (not shown by broken lines) which is not used.

In order to avoid causing heat loss in the above case, it is provided that the lid member 7 (see FIG. 1B) is introduced into the processing line while drawing out the milling machine 4 from the processing line. The lid member is formed in a form that can be thermally insulated, thereby suppressing the point that the slab is cooled too strongly. The lid member 7 can also be formed as a furnace member, that is to say heated.

In other words, in order to switch from the milling cutting operation mode to the milling cutting non-operation mode or vice versa, the unit composed of the milling machine 4 and the lid member 7 is transverse to the feed direction F. It can be conveyed in the direction Q at the same time.

2a and 2b schematically show an alternative solution. According to this embodiment, the milling cutting operation mode and the descaling operation mode can be selected alternately. For this purpose at least one upper descaling unit 11 ′ is provided. This descaling unit is withdrawn from the machining position when the milling machine 4 is conveyed to the machining position. However, the descaling unit 11 'is drawn into the machining position when the milling machine 4 is withdrawn from the machining position while moving in the direction Q.

In other words, the descaling system 11 assembly can be pulled out or raised from the machining line so that it can be replaced by the milling machine 4, and vice versa the milling machine and the descaling system can be moved respectively. According to a preferred embodiment in this regard, the descaling system 11 and the milling machine 4 are arranged up and down with each other and the target unit is raised or moved into the rolling line (processing line) as required.

3 again shows the configuration of the system, although detailed in structure, only schematically. According to this embodiment, it corresponds to two stands 19 on which the respective milling cutters 5, 6 are arranged so as to mill-cut the top and bottom surfaces of the slab 3 passing in the feed direction F. The support roller 9 can be confirmed. The lid members 7 ′ can be positioned and fixed next to the stand 19 while having thermally superior insulating properties, while on one side the members 9, 6 (arranged above the slab 3) ( On the other side of the support roller and the milling cutter), the lid members 7 can be arranged alternately according to the selection. In other words, if the upper support roller 9 and the milling cutter 6 are in operation, the lid members 7 are not located in the position shown. Correspondingly, when the lid members 7 are positioned as shown, the upper support roller 9 and the milling cutter 6 are displaced out of that position.

The same applies to the bottom of the slab. According to this embodiment, the support roller 9 and the milling cutter 5 can be replaced by the lid member 7 and the table roller 22.

According to a further embodiment of the invention, which is replaced with FIG. 1 or 2 and according to FIG. 4, the milling machine 4 is separated into two part machines 4 ′, 4 ″ in the forward direction F. In the present first milling machine 4 ′, the upper face of the slab 3 is milled in the present embodiment, whereas the milling machine 4 ″ located at the rear mills the bottom of the slab 3. . The furnace 10 is arranged between two milling machines 4 ', 4 ".

In addition, a profile measuring device 20 is provided in front of the first milling machine 4 ′.

According to the embodiment of FIG. 5, the descaling nozzle bar 21 is integrated inside the second milling machine 4 ″ to allow descaling to be carried out in combination with milling cutting while saving space.

According to a further alternative embodiment of the invention according to FIG. 6, a furnace 12 is arranged between the milling machine 4 and the descaling system 11. The slab 3 is thus maintained at the desired optimum process temperature or heated after the milling cutting process.

In other words, the proposed tandem milling devices 4, 4 ', 4 "can be set up to suit the application, while being as optimal as possible at high temperatures for subsequent rolling processes, or at low temperature loss conditions. To achieve temperature control. For this purpose, the milling machines 4, 4 ', 4 "are raised into the rolling or conveying line only when necessary, or the minimum temperature loss is achieved according to the respective application. To be placed. 1 and 2 described above show the preferred arrangement of the milling machine, the furnace and the descaler provided in front of the finishing line and the possibility of their adjustment. According to FIG. 1, as explained, in relation to a two-strand CSP system, the rear portion of the furnace or roller table capsule is formed to be transversely displaceable, so that the furnace segment or tandem milling machine can be positioned in the rolling line. It becomes possible. According to the alternative arrangement, it is also conceivable to displace the descaler transversely, or to withdraw the descaler assembly, thus replacing the descaler and the tandem milling machine. In addition, as can be seen in Figure 2b, it is also possible to raise the upper descaling nozzle bar. By arranging the tandem milling machine immediately before the finishing line, the surface is cleaned by the milling machine, so that the descaling process can not be carried out again, or the pressure and water usage can be reduced, or the spray bar assembly Can be disabled. In addition, the temperature loss is thereby minimized. It is also conceivable to arrange an inert gas housing between the milling machine and the rolling train arranged according to this embodiment.

In addition, instead of transversely displacing the milling machine, the furnace segment or the descaler assembly, according to the alternative arrangement, it is possible to form a milling machine area with a passive roller table cover (insulation), Thus, as can be seen in FIG. 3, the temperature loss in the region of the milling machine can be reduced. To this end, only the milling cutting rolls and thus supporting rollers can be withdrawn from the line when the milling machine is deactivated, and the roller table capsule can be pivoted in or displaced in that area.

In order to minimize the temperature loss in front of the finishing line, the surface finish for the top and bottom can be separated by position, preferably as can be seen from FIGS. 4 and 5. The upper surface of the slab is thus machined behind the transverse feeder (in the middle of the furnace area) and the slab bottom is machined behind the furnace 10 so that the milling cutting area provided in front of the rolling sequence is kept as short as possible.

According to an alternative arrangement, the milling cutting unit can be integrated in the descaler at the bottom side, which is schematically shown in FIG. 5. The milling machine provided behind the furnace at the bottom face not only eliminates casting defects, but also eliminates some of the damage that sometimes occurs on the slab surface by the furnace rollers.

The methods described above can be applied on their own or in combination.

Surface machining on both sides or surface only on the front of the furnace (just behind the casting machine) can also be considered, but in a two-strand system it is twice as complex.

According to the preferred arrangement of the milling machine 4 in relation to the temperature control, as can be seen from FIG. 6, the entire milling machine 4 (the upper and lower milling cutters) is moved to the rear of the traverse device 17 (in the middle of the furnace area). It can also be placed in). Thereby the temperature loss in the region of the milling machine 4 can preferably be compensated again in the furnace element at the rear. It is also possible to configure an induction heating device behind the milling machine instead of the conventional gas-fired furnace.

Claims (16)

As a manufacturing apparatus for manufacturing the metal strip 1 by continuous casting while using the casting machine 2 on which the slab 3 is cast, At least one milling machine 4 is arranged behind the casting machine 2 in the feed direction F of the slab 3, in which at least one surface of the slab 3 is milled. In the manufacturing apparatus that can be, The milling machine (4) is characterized in that it is arranged displaceably in a direction (Q) which is transverse to the conveying direction (F) of the slab. 2. The manufacturing apparatus according to claim 1, wherein the direction Q transverse to the conveying direction F is oriented horizontally. At least one lid member (7) with thermal insulation properties is provided, the lid member (7) being in a direction (Q) transverse to the conveying direction (F). A manufacturing apparatus, characterized in that the displaceable arrangement. 4. Manufacturing apparatus according to claim 3, characterized in that the at least one lid member (7) can be heated. The production apparatus according to claim 1 or 2, characterized in that the furnace (8) is arranged in front of the milling machine (4) in the feed direction (F). The manufacturing apparatus according to claim 1 or 2, characterized in that each milling cutter (5, 6) is arranged for the machining of the top and bottom surfaces of the slab (3). 7. Manufacturing apparatus according to claim 6, characterized in that the two milling cutters (5, 6) are arranged spaced apart from each other in the feed direction (F). 8. Manufacturing apparatus according to claim 7, characterized in that each milling cutter (5, 6) works with a support roller (9) arranged on the other side of the slab (3). 8. A manufacturing apparatus according to claim 7, characterized in that a furnace (10) is arranged between two milling cutters (5, 6) for machining the top and bottom surfaces of the slab (3), respectively. 3. The apparatus according to claim 1, wherein the descaling system is arranged behind the milling machine in the conveying direction. 4. 11. A manufacturing apparatus according to claim 10, characterized in that a furnace (12) is arranged between the milling machine (4) and the descaling system (11). The descaling system 11 is arranged next to the milling machine 4 at the same height as seen in the feed direction F, and the milling machine 4 and the descaling. The system 11 is characterized in that it can be alternately drawn into or taken out of the processing line by means of a moving means in a direction Q forming a transverse direction of the conveying direction F. Manufacturing device. The production apparatus according to claim 1 or 2, characterized in that the rolling rows (13, 14) are arranged behind the milling machine (4) in the feed direction (F). delete delete delete

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