Method and device for producing a metal strip in a continuous casting and rolling process

Abstract

The invention relates to a method for producing a metal strip (1) in a continuous casting and rolling process, in which a slab is first cast in a casting machine and is then fed to a finishing rolling mill situated downstream in the direction of feed (F) of the strip (1), where it is rolled. According to the invention, in order to enable the recycling of scrap while achieving a compact design, the following steps are performed in the event of a planned or unplanned production interruption in the finishing rolling mill: a) cutting through the strip (1) at a point (4) between the casting machine (2) and the finishing rolling mill by means of a cutting device (5); b) feeding the part of the strip (1) that follows the cut into a strip store (6) by means of a driver (7), the driver (7) being situated downstream of the cutting device (5) in the direction of feed (F); c) cutting through the strip (1) a second time by means of the cutting device (5) and cutting the following part of the strip (1) into pieces by means of the cutting device (5); d) cutting the stored strip section into pieces, preferably of a defined length. The invention further relates to an apparatus for carrying out the method.

Claims

1. A method for producing a metal strip (1) in a continuous casting and rolling process, in which a slab is first cast in a casting machine (2) and is then fed to a finishing rolling mill (3) situated downstream in the direction of feed (F) of the strip (1), where it is rolled, the method comprising: a planned or unplanned production interruption occurs in the finishing rolling mill (3) and the following steps are performed: a) cutting through the strip (1) at a point (4) between the casting machine (2) and the finishing rolling mill (3) by means of a cutting device (5); b) feeding the first strip section of the strip (1) that is downstream of the cut in the direction of feed (F) into a strip store (6) by means of a driver (7), the driver (7) being situated downstream of the cutting device (5) in the direction of feed (F); c) cutting through the strip (1) a second time by means of the cutting device (5), and cutting an adjacent part of the strip (1) into pieces, preferably of a defined length, by means of the cutting device (5); and d) cutting the first strip section into pieces, of a defined length, wherein the first strip section located in the strip store (6) is fed back by means of the driver (7) in the direction opposite the direction of feed (F) to the cutting device (5), wherein the first strip section is cut into pieces by means of the cutting device (5).

2. The method according to claim 1, wherein in step c) the pieces are discharged into a collecting space (8).

3. The method according to claim 1, wherein step d), the pieces are discharged into a collecting space (8).

4. The method according to claim 1, wherein steps a) to d) of claim 1 are carried out in the stated chronological order.

5. The method according claim 1, wherein in step c) of claim 1, strip sections are cut to a length in the direction of feed (F) of between 0.1 m and 5 m.

6. An apparatus for producing a metal strip (1) in a continuous casting and rolling process, comprising a casting machine (2) and a finishing rolling mill (3), situated downstream thereof in the direction of feed (F) of the strip (1), for carrying out the method according to claim 1, wherein a cutting device (5) is provided between the casting machine (2) and the finishing rolling mill (3), and in that a strip store (6) for receiving a strip section is provided downstream of the cutting device (5) in the direction of feed (F), wherein downstream of the cutting device (5) and upstream of the strip store (6) in the direction of feed (F) a driver (7) is located, which is designed to feed the strip (1) into the strip store (6), wherein the driver (7) is also designed to feed the strip (1) back to the cutting device (5).

7. The apparatus according to claim 6, wherein the cutting device (5) is a rotary shear.

8. The apparatus according to claim 6, wherein the cutting device (5) is a pendulum shear or a movable gate shear.

9. The apparatus according claim 6, wherein a collecting space (8) for strip pieces is provided below the cutting device (5).

10. The apparatus according to claim 9, wherein a scrap chute (9) is provided between the cutting device (5) and the collecting space (8).

11. The apparatus according to claim 6, wherein an additional driver (10) is provided upstream of the cutting device (5) in the direction of feed (F).

12. The apparatus according to claim 6, wherein a furnace (11) is provided upstream of the cutting device (5) in the direction of feed (F).

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The set of drawings illustrates one embodiment of the invention. The drawings show:

(2) FIG. 1 a schematic illustration of a continuous casting and rolling mill for producing a steel strip and

(3) FIG. 2 an enlarged view of a cutting device in the form of a shear, which is situated between the casting machine and the finishing rolling mill in the system.

DETAILED DESCRIPTION OF THE INVENTION

(4) FIG. 1 is a diagram of an example of a continuous casting and rolling mill, configured as a fully continuous mill and comprising as its central elements a casting machine 2 and a finishing rolling mill 3 Downstream of casting machine 2 a roughing mill 12 is provided, to whichdepending on the system configurationa furnace 11 (connecting roller table with heating function) is attached. Downstream of furnace 11 is finishing rolling mill 3 Downstream of finishing rolling mill 3 are a cooling zone 13 and a cutting device in the form of a flying shear 14. This is followed by at least one reel 15 and 16 in direction of feed F.

(5) Between roughing mill 12 and furnace 11, a cutting device in the form of a shear 17 for strip 1 is provided. An additional shear 5 (cutting device) is located between furnace 11 and finishing rolling mill 3 at a point 4. Finally, the additional shear (cutting device) 14 is located downstream of cooling zone 13 and upstream of reels 15, 16. FIG. 1 shows an additional shear (cutting device) 17 situated downstream of casting machine 2 and furnace 11.

(6) At point 4as mentioned abovethe additional cutting device (shear) 5 is provided, which is detailed more closely in FIG. 2. As the part of the system illustrated in FIG. 2 further shows, a strip store 6, indicated only schematically, is located downstream of cutting device 5 in direction of feed F. Strip 1 emerging from furnace 11 is conveyed by means of a driver 10. Strip 1 can be severed or cut through by means of cutting device 5, which is optionally embodied as a rotary shear. A further driver 7 can then feed the severed strip 1 into strip store 6.

(7) As was described above, in the event of a production interruption in finishing rolling mill 3, strip 1 is cut through at point 4 by cutting device 5. The part of strip 1 that is located downstream of cutting device 5 in direction of feed F is then fed into strip store 6 by means of driver 7. Once strip 1 has been severed or cut through a second time by means of cutting device 5, the strip section following it from casting machine 2 can be cut into pieces. The strip is cut into pieces, preferably of a defined length, in a known manner (see EP 2 259 886 B1 in this regard), and is discharged into a collecting space 8 via a scrap chute 9.

(8) Once this process is complete, the strip 1 that is being held in strip store 6 is fed back in the direction opposite direction of feed F by means of driver 7 to cutting device 5, cut into pieces by cutting device 5, and likewise discharged into collecting space 8.

(9) Of course, the proposed method may also be used in a continuous casting and rolling mill having a different system configuration.

LIST OF REFERENCE SIGNS

(10) 1 strip 2 casting machine 3 finishing rolling mill 4 point 5 cutting device (shear) 6 strip store 7 driver 8 collecting space 9 scrap chute 10 driver 11 furnace 12 roughing mill 13 cooling zone 14 cutting device (flying shear) 15 reel 16 reel 17 cutting device (shear) F direction of feed