JP4880752B2 - Method and apparatus for producing metal strip by continuous casting - Google Patents

Description

  The invention comprises a casting machine in which a slab, in particular a thin slab, is cast, in which at least one milling machine is arranged after the casting machine in the conveying direction of the slab, in which the surface of the slab, in particular two The present invention relates to a method for producing metal strips by continuous casting, in which the facing surfaces can be milled. Furthermore, the invention relates to an apparatus for producing a metal strip.

  When continuously casting a slab in a continuous casting equipment, surface defects such as vibration marks, cast powder defects or surface cracks extending vertically and horizontally can occur. These occur in conventional and thin slab casting machines. Therefore, the conventional slab is partially burned out depending on the intended use of the finished strip. A considerable amount of slab is generally burned out at the customer's request. In this case, the demand for the surface quality of the thin slab equipment continuously increases.

  For surface treatment, flame (burning), polishing or milling is provided.

  The flame (burning out) has the disadvantage that the melted material cannot be melted again without regeneration due to the high oxygen content. In polishing, metal debris is mixed with abrasive disc dust, so the recovered material must be dust treated. Both methods are difficult to adapt to a given transport speed.

  Therefore, surface processing by milling can be considered. At this time, hot milling waste is collected, packaged, melted again without problems and re-adapted to the production process. Furthermore, the rotational speed of the milling cutter can be easily adjusted to the transport speed (casting speed, finishing rolling-inflow speed). Therefore, the device of the invention is aimed at milling.

  It is known that an apparatus of the kind comprises a milling machine that is arranged after the continuous casting equipment. In this connection, Swiss Patent No. 584085 (Patent Document 1) and German Patent Application Publication No. 19950886 (Patent Document 2) are shown.

  A similar solution is also disclosed in German Utility Model No. 7111221 (Patent Document 3). This document shows the processing of the aluminum strip under the use of casting heat, in which the machine is connected to the casting equipment.

  In-line removal from the surface of the thin slab shortly before the rolling path on the upper and lower surfaces or on one side has also been proposed and is shown in EP-A-1093866 (Patent Document 4).

  Another configuration of a surface milling machine is shown in DE 197 17 200 A1 (Patent Document 5). This describes the changeability of the milling profile of a milling device arranged after the continuous casting equipment or rolling path.

  Other arrangements and configurations of in-line milling machines in a conventional hot strip path for processing a front strip are described in European Patent No. 790093 (Patent Document 6), European Patent No. 1213076 (Patent Document 7) and European Patent. No. 1213077 (Patent Document 8).

  In the surface processing of thin slabs in so-called CPS equipment, approximately 0.1-2.5 mm of one or both sides of the hot slab surface should be removed in the processing line (inline) depending on the detected surface defects. is there. A thin slab as thick as possible is recommended (H = 60-120 mm) in order not to reduce the refining strongly.

  Inline-milling machines are usually not used for all products in a rolling program, but rather only for products that require higher surface requirements. This is preferred for refining reasons and reduces milling machine wear and is therefore important.

Inline-milling machines require structural space. Temperature loss in the machine area gets in the way. This is suitable for later use of the casting machine because the casting speed (mass flow rate) is usually low. However, temperature loss is a disadvantage prior to the finish path, especially for thin strips, where a high final rolling temperature is sought when the strip outflow rate from the finish path can be tolerated.
Swiss Patent No. 584085 German Patent Application No. 19950886 German utility model No. 7111221 European Patent Application No. 1093866 German Patent Application No. 19717200 European Patent No. 0790093 European Patent No. 1213076 European Patent No. 1213077

  The object of the present invention is therefore based on improving the apparatus and method for producing metal strip by continuous casting under the use of a milling machine so that optimum slab processing is possible even with different process technical requirements. . In particular, the temperature loss should be kept slightly during slab processing or processing.

  The solution to the problem according to the invention is characterized in that at least the milling cutter of the milling machine, in particular the entire milling machine, is arranged so as to be movable in a direction transverse to the conveying direction of the slab.

  Therefore, the thermal budget of the equipment can be optimized as seen in detail.

  In this case, the direction crossing the transport direction is preferably aligned in the horizontal direction.

  It can be envisaged that the at least one cover element with thermal insulation properties is arranged to be movable in a direction transverse to the conveying direction. At this time, the heat insulating material is particularly stable to heat. For example, an already thick thin plate or a plate made of a refractory non-metallic material can serve the purpose.

  In doing so, it can further be envisaged that at least one cover element is formed heatable. In this case, the cover member has a function of a furnace.

  A furnace is arranged in the conveying direction in front of the milling machine. One milling cutter can be arranged for processing the upper and lower surfaces of the slab. At this time, it is preferably contemplated that the two milling cutters are spaced from each other in the conveying direction. Furthermore, it was specifically selected when each milling cutter cooperates with one support roll located on the other side of the slab.

  A furnace may be placed between both milling cutters that process the upper or lower surface of the slab.

  A scale remover can be arranged in the transport direction after the milling machine. In this case, it can be envisaged that a furnace is arranged between the milling machine and the scale removal device.

  The selective configuration of the present invention is such that a scale removing device is arranged beside the milling machine when viewed at the same height in the conveying direction, and the milling machine and the scale removing device are selectively moved by the movement means in the direction crossing the conveying direction. It is intended to enter or go out.

  At least one rolling path is arranged in the conveying direction after the milling machine.

  The milling machine can be divided into two part machines that are spaced apart from each other, for example milling different sides of the slab.

  Furthermore, it is advantageous when the milling machine or a part of the milling machine is integrated into the scale removal device to enable a compact configuration.

  The method of producing the metal strip by continuous casting determines whether or not the milling machine is used before rolling the slab, depending on the detected or predetermined surface characteristics of the slab by means of a simulation model started by the machine controller. It is characterized by being. The simulation model is preferably a processing model known in the prior art or a so-called level-3-system.

  Therefore, an optimum manufacturing format can be automatically contemplated. For surface critical products, i.e., milling takes place before rolling, while in normal products rolling takes place without surface processing by a milling cutter.

  According to the proposed solution, the temperature loss can be kept slightly in the slab process or processing and an acceptable finish line inlet temperature can be achieved. This leads to a qualitatively improved production of slabs, especially thin slabs.

  The milling machine going out of the processing line can generally be replaced with other functional elements and is preferably considered in the scale removal device. However, for example, instead of a milling machine, the furnace part can enter the processing line. Of course, an insulating element that simply prevents the cooling of the strip can be entered instead of a milling machine or milling cutter, as will be explained.

  According to the proposed design aspect, it is further possible to carry out work modes that are optimally adjusted for specific uses, in particular automatically.

  In this case, an acceptable finish path inlet temperature is achieved.

  The drawings show an embodiment of the present invention.

  1a and 1b show an apparatus for producing a metal strip by continuous casting. A metal strip 1 or a corresponding slab 3 is continuously cast in a known manner on a casting machine 2. In the slab 3, a thin slab is preferably important. Immediately after the casting machine 2, the slab 3 is subjected to slab cleaning by the cleaning equipment 15. Following the cleaning, a surface inspection is performed by the surface measuring device 16. Subsequently, as the slab 3 reaches the furnace 8, the slab can be maintained at the desired processing temperature. A ferry 17 is connected to the furnace.

  As can be seen in FIG. 1b, two strands can be cast simultaneously, i.e. two parallel cast strands are contemplated.

  After the furnace 8 or the ferry 17, the slab 3 reaches the milling machine 4. At present, two milling cutters 5 and 6 are arranged on the milling machine at approximately intervals in the conveying direction F, and the lower surface or the upper surface of the slab 3 can be milled by the milling cutter. A surface facing each of the slabs 3, that is, an upper surface or a lower surface of the slab is supported by the support roll 9.

  A scale remover 11 is present after the milling machine 4, which allows the scale to be removed from the strip surface. After the scale removing device 11, the metal strip 1 finally reaches the rolling path in which the rolling stands 13 and 14 are illustrated.

  Under the milling machine 4, there is a collection container 18, in which the milled material is collected.

  However, it is essential that at least one of the milling cutters 5 or 6 of the milling machine 4, particularly the entire milling machine 4, is arranged so as to be movable in the direction Q across the conveying direction F of the slab 3.

  As best seen in FIG. 1b, the milling machine 4 can be positioned in a first state (shown in bold), in which the milling machine can enter the machining line and mill the slab 3. However, the milling machine is arranged in the second state (illustrated by dotted lines), and the milling machine is not used in this second state.

  In this case, since no heat loss occurs, the machining element 7 (see FIG. 1b) enters the machining line at the same time as the milling machine 4 goes out of the machining line, and the entry is performed with thermal insulation, It is therefore contemplated to prevent the slab from being overcooled. The cover element 7 can be formed as a furnace part, i.e. heated.

  In order to switch from milling operation to non-milling operation and vice versa, the unit consisting of the milling machine 4 and the machining element 7 can be moved simultaneously in the direction Q across the conveying direction F.

  An alternative solution is depicted in FIGS. 2a and 2b. Here, it is contemplated that a choice can be made between milling and descaling operations. For this purpose, at least one upper scale removal unit 11 ′ is provided, which provides an external action if the milling machine 4 enters the machining position. The scale removal unit 11 'is brought into the processing line when the milling machine 4 is brought to an external action in the direction Q by the movement means.

  The complex descaling unit 11 is swung out of the processing line or moved out and replaced with the milling machine 4 and vice versa. In this case, a preferred configuration is that the descaling unit 11 and the milling machine 4 are arranged and are intended to be moved or moved to the rolling line (working line) as required by the desired unit. .

  FIG. 3 schematically shows that the system can be configured, although usually in detail. Two stands 19 each having one milling cutter 5 or 6 and a corresponding support roll 9 are provided, and the upper and lower surfaces of the slab 3 passing in the conveying direction F are milled. While the cover element 7 ′ with a good thermal insulation property can be placed in place by the stand 19 in place, the elements 9 and 6 shown on the top of the slab 3 (support rolls and milling cutters) On the other hand, the cover elements 7 can be arranged selectively and alternately. If the upper support roll 9 and the milling cutter 6 are in operation, the cover element 7 is not in the position shown. In this case, it is appropriate that the support element 7, the upper support roll 9 and the milling cutter 6 as shown and positioned are brought to the external position.

  Similar to the bottom of the slab. Here, the support roll 9 and the milling cutter 5 can be exchanged through the cover element 7 and the roll passage roll 22.

  1 or 2 according to the invention according to FIG. 4 aims at dividing the milling machine 4 into two partial machines 4 ′ and 4 ″. The first milling machine 4 in the conveying direction F 'Currently has the upper surface of the slab 3 milled; the milling machine 4 "mills the lower surface of the slab 3. One furnace 10 is arranged between both milling machines 4 'and 4 ".

  One contour measuring unit 20 is provided in front of the first milling machine 4 '.

  The embodiment according to FIG. 5 has an integrated scale removal nozzle beam 21 in the second milling machine 4 ″, saving space and performing scale removal in combination with a milling cutter.

  According to another alternative embodiment of the invention, according to FIG. 6, a furnace 12 is arranged between the milling machine 4 and the scale removal unit 11. Therefore, the slab 3 is maintained or brought to the desired optimum processing temperature after the milling cutter.

  The proposed in-line milling device 4, 4 ', 4 "is tailored in use and has the task of optimizing the temperature guidance as high as possible for the subsequent rolling process at high temperatures or with little temperature loss. For this purpose, the devices 4, 4 ′, 4 ″ are moved to the rolling line or the transportation line only as needed depending on the use, or arranged so that a minimum temperature loss occurs. In this case, the described FIGS. 1 and 2 show the possibility of matching with the preferred arrangement of the milling machine, furnace and scale washer before the finishing path. As illustrated in FIG. 1, in the 2-strand-CSP equipment, the rear part of the furnace or roll passage capsule is formed to be movable laterally, so that the furnace segment or the in-line milling device stands on the rolling line. Yes. Optionally, the scale cleaner can be moved laterally or complex scale cleaners can be lifted, allowing for in-line milling. Further, as shown in FIG. 2b, a high swirl of the upper scale washer nozzle beam is possible. An inline-milling machine arrangement short before the finish path can abandon new descaling, pressure and water volume can be reduced, or complex jet beams can be interrupted because the surface is milling machine 4 This has the advantage of being cleaned. Furthermore, temperature loss is minimized. Inactive storage can be considered between the milling machine and the rolling path arranged here.

  Instead of a complex milling machine, a milling machine area with a passive roll passage cover (blocking part) is selectively formed to move the furnace segment or scale washer laterally, and temperature loss in the milling machine area It can be reduced as illustrated in FIG. For this reason, in a milling machine that does not operate, simply the milling roller and possibly the support rolls are transferred from the line and the roll channel capsule is swiveled or moved into this region.

  To minimize temperature loss in front of the finish path, it is preferable to divide the surface treatment into locations on the top and bottom surfaces, see FIGS. 4 and 5. Since the upper surface of the slab is processed after the ferry 17 (center of the furnace region) and the lower surface of the slab is processed after the furnace 10, the milling region is kept as short as possible before the rolling furnace.

  Optionally, as depicted in FIG. 5, a milling unit may be integrated with a scale washer on the underside. On the underside, the milling machine after the furnace not only removes casting defects, but with the 2-strand-CSP equipment, the rear part of the furnace or roll passage capsule can move sideways.

  The previously mentioned possibilities can be used or combined.

  Although the surface treatment on both sides or the top of the furnace (immediately after the caster) can be taken into account, with a two-strand installation the cost is doubled.

  A preferred arrangement for temperature guidance of the milling machine 4 places the entire milling machine 4 (from the top and the bottom milling cutter) after the ferry 17 (center of the furnace area), as FIG. 6 shows. The temperature loss in the area of the milling machine 4 can be compensated again in the rear furnace part in a favorable manner. Instead of a conventional gas heated furnace, induction heating can also be formed after the milling machine.

Fig. 2 schematically shows a side view of an apparatus for producing a continuous casting metal strip in which a milling machine can be used. FIG. 2 shows a top view of the apparatus attached to FIG. FIG. 2 shows a side view of an apparatus for producing a metal strip that is a substitute for FIG. Figure 2b shows a top view of the apparatus attached to Figure 2a. Fig. 2 schematically shows a milling machine similar to Fig. 1 with an enlarged view and with the thin elements shown. FIG. 2 shows a side view of another alternative to FIG. 1 a, in which milling units are placed spatially apart from each other to mill different sides of the slab. FIG. 5 shows a side view of an apparatus that is a substitute for FIG. FIG. 2 shows a side view of another alternative to FIG. 1 a with a furnace between the milling machine and the rolling path.

Explanation of symbols

1. . . . . Metal strip . . . . Casting machine
3. . . . . Slab 4, 4 ', 4 "... Milling machine 5, 6 ... Milling cutter 7, 7' ... Cover element 8 ... Furnace 9 ... Support roll 10 ... ... Furnace 11 ... Scale removal device 11 '... Scale removal unit (scale removal nozzle beam)
12 . . . Furnace 13. . . . Rolling stand 14. . . . Rolling stand 15. . . . Cleaning equipment 16. . . . Surface measuring device 17. . . . Ferry 18. . . . Collection container 19. . . . Stand 20. . . . Outline measuring unit 21. . . . Scale removal nozzle beam 22. . . . Roll passage roll F. . . . . Transport direction Q. . . . . Lateral direction

Claims (13)

The slab (3) includes a casting machine (2) for casting, and at least one milling machine (4) is disposed after the casting machine (2) in the conveying direction (F) of the slab (3). In the milling machine, the surface of the slab (3) can be milled, and in the apparatus for producing the metal strip (1) by continuous casting , at least one milling cutter (5, 6) of the milling machine (4) is the slab (3). The apparatus is arranged to be movable in a direction (Q) crossing the transport direction (F).   2. A device according to claim 1, characterized in that the direction (Q) across the conveying direction (F) is aligned in the horizontal direction.   3. At least one cover element (7) with thermal insulation properties is present, the cover element being arranged movably in a direction (Q) across the conveying direction (F). The device described.   Device according to claim 3, characterized in that at least one cover element (7) is formed heatable.   5. A device according to claim 1, wherein a furnace (8) is arranged in front of the milling machine (4) in the conveying direction (F).   6. A device according to claim 1, wherein one milling cutter (5, 6) is arranged for each of the upper and lower surfaces of the slab (3).   7. Device according to claim 6, characterized in that both milling cutters (5, 6) are spaced apart from each other in the conveying direction (F).   8. Device according to claim 7, characterized in that each milling cutter (5, 6) cooperates with a support roll (9) arranged on the other side of the slab (3).   9. A device according to claim 7 or 8, characterized in that a furnace (10) is arranged between both milling cutters (5, 6) for machining the upper or lower surface of the slab (3).   10. The device according to claim 1, wherein a scale removal device (11) is arranged after the milling machine (4) in the transport direction (F).   Device according to claim 10, characterized in that a furnace (12) is arranged between the milling machine (4) and the scale removal device (11).   A scale removing device (11) is arranged beside the milling machine (4) when viewed at the same height in the conveying direction (F), and the milling machine (4) and the scale removing device (11) are selectively conveyed by the movement means. 10. A device according to any one of the preceding claims, characterized in that it enters or leaves the processing line in a direction (Q) that crosses the direction (F).   13. A device according to any one of the preceding claims, characterized in that a rolling path (13, 14) is arranged after the milling machine (4) in the conveying direction (F).

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