CN113877965A

CN113877965A - Casting and rolling compound equipment with rotary coiler

Info

Publication number: CN113877965A
Application number: CN202110748893.8A
Authority: CN
Inventors: H·菲尔斯特; S·格罗塞贝尔; S·伊利克; T·郎高尔; B·林泽尔; P·奥斯特海默; R·温克勒; M·扎赫迪
Original assignee: Primetals Technologies Austria GmbH
Current assignee: Primetals Technologies Austria GmbH
Priority date: 2020-07-03
Filing date: 2021-07-02
Publication date: 2022-01-04
Also published as: EP3932585A1

Abstract

The invention relates to a cast-rolling complex plant with a rotary coiler (18) for producing hot-rolled finished strip from steel having a thickness of less than or equal to 1 mm. The aim of the invention is to increase the reliability of the cast-rolling composite plant when producing very thin finished strip in a high mass flow. The object is achieved by a combined casting and rolling plant, wherein a rotary coiler (18) for winding the finished strip onto a first and a second winding core (21 a, 21 b) is arranged downstream of the shear (16) in the material flow direction, wherein each winding core (21 a, 21 b) has a separate rotary drive (20 a, 20 b) for rotating the winding core (21 a, 21 b) about its axis of rotation (22 a, 22 b) and the rotary coiler (18) has a rotary drive for jointly deflecting the winding cores (21 a, 21 b) about a common axis of rotation (28) on an elliptical, preferably circular, path (29).

Description

Casting and rolling compound equipment with rotary coiler

Technical Field

The invention relates to the technical field of casting and rolling compound equipment. In the case of a combined casting and rolling installation, the continuous casting installation is connected in-line to at least one rolling mill, but usually two rolling mills. In the continuous casting installations, liquid steel is typically cast into a cast strand with a slab or thin slab cross section. The continuously cast strand is finish rolled in the at least one rolling mill to a finished strip by hot rolling. By the inline connection of the continuous casting installation with the rolling mill, the casting-rolling complex installation can be made extremely compact. The cast-rolling complex apparatus has a high productivity because the continuous casting apparatus can achieve a high casting speed.

Background

In the case of cast-rolling plants according to the prior art, the finished strip is typically wound onto a plurality of, for example two or three, coilers (english). The coiler is arranged after the cooling stretch, the core of which is below the so-called pass line of the finished strip (hence the name "underground coiler"). During operation of the cast rolling complex, a first finished strip is wound on a first coiler. Shortly before the first coiler has reached its capacity, the finished strip is transversely cut and the subsequent finished strip section is diverted to another coiler, which is arranged either before or after the first coiler. The advancing finished strip section is wound on a first coiler. In particular, for high mass flows in combination with thin finished strip, high transport speeds of the finished strip occur on the roller table of the cast-rolling assembly. After the transverse cutting of the finished strip, the strip head of the finished strip is not clamped between the shearing machine and the other coiler, so that, in particular at high transport speeds, the following situations may occur, namely: the strip head is not received by the winding core. In this case, the hot rolling must be stopped immediately, which greatly reduces the reliability and productivity of the cast-rolling complex.

DE 19518144 a1 discloses a cast-rolling complex plant which is suitable for producing hot-rolled finished steel strips having a thickness of between 1.6 and 40 mm. In one embodiment, a rotary coiler (karusselhassel) for winding the cut strip is present after the cooling line and the shearing machine.

Not known from the prior art are: how the cast-rolling complex plant according to the prior art must be modified so that it is suitable for producing very thin hot-rolled finished strips having a thickness of 1mm or less, preferably 0.8mm or less, preferably even 0.6mm or less; and how the reliability of such a cast-rolling complex for manufacturing very thin hot-rolled finished strips with a high mass flow can be improved.

Disclosure of Invention

The aim of the invention is to increase the reliability of a casting and rolling complex plant, in particular of the Arvedi ESP type, when producing very thin (thickness < 1 mm) hot-rolled finished strip in a high mass flow.

This object is achieved in terms of apparatus by a cast-rolling complex according to claim 1. Preferred embodiments are the subject of the dependent claims.

In particular, the cast-rolling complex plant for producing a hot-rolled finished strip having a thickness of 1mm or less, preferably 0.8mm or less, particularly preferably 0.6mm or less, has the following components:

a continuous casting installation for continuously casting a continuously cast strand having a slab or thin slab cross section from molten steel, having curved strand guiding means;

-a multi-stand roughing train for roughing the cast slab into a roughing strip;

-a multi-stand finishing train for finishing the rough rolled strip into a finished strip;

-a cooling section for cooling the finished strip;

-a shear for transverse cutting of the finished strip, wherein the shear is arranged after the cooling section in the material flow direction. The cast-rolling complex plant is improved with respect to the technical task in that a rotary coiler for winding the finished strip onto a first and a second winding core is arranged downstream of the shear in the material flow direction, wherein each winding core has a separate rotary drive for rotating the winding core about its axis of rotation and the rotary coiler has a rotary drive for deflecting the winding cores together about a common axis of rotation on an elliptical, preferably circular, path.

The rotary coiler with at least two winding cores is used to replace a plurality of recoiling machines which are arranged in sequence along the conveying direction of the finished strip steel. Each core of the rotary reel-up according to the invention has a separate drive means, such as a hydraulic or electric motor, for rotating the core about its axis of rotation. The axis of rotation of the winding core is typically horizontal. The rotary reel-up furthermore has a rotary drive for deflecting the cores together about a common axis of rotation on an elliptical, preferably circular path. The axis of rotation of the slew drive is also typically horizontal. The drive for the winding core is a fast rotating drive (high speed rotor) with a rotational speed of up to 8001/min. In contrast, the rotary drive rotates slowly (low-speed rotor) typically at speeds of up to 0.11/min.

According to a preferred embodiment, the separate rotary drive for the reeling core is a variable speed drive. The drive is thus either a hydraulic rotary drive operating in an open or closed circuit or an electric rotary drive with a synchronous or asynchronous motor which is controlled or speed-regulated by a frequency converter.

In order to cut the finished strip as free of tension as possible, it is advantageous if at least one pair of drive rollers is arranged immediately before the shearing machine and preferably also immediately after the shearing machine. By means of the pair of drive rollers, the tension in the finished strip can be minimized before cutting. Thereby improving the reliability of the transverse cut and the quality of the cut.

Furthermore, it is advantageous if the rotary reel-up is arranged in the horizontal direction relative to the shear such that the distance between the shear and the reeling core of the rotary reel-up at the start of reeling is < 6m, preferably < 3 m. The pitch is measured from the blade of the shear up to the axis of rotation of the first core.

In addition, it is advantageous in the cast-rolling mill complex according to the invention if the rotary coiler is arranged in the vertical direction relative to the shear in such a way that the upper edge of the reeling core is located on the pass line of the finished strip.

The two aforementioned embodiments are each very advantageous per se and in particular in combination with one another. On the one hand, the spacing between the shear and the reeling core is much shorter than in other reel-up solutions, where the spacing may be > 14 m. On the other hand, the arrangement of the winding cores on the pass line of the finished strip is also very advantageous, since the strip no longer has to be diverted below the pass line.

The rotary reel-up can be made particularly compact if the first rotary drive is connected to the first winding core by a shaft and the second rotary drive is connected to the second winding core by a hollow shaft, which at least partially surrounds the shaft.

Preferably, the first rotary drive is connected to the shaft via a first transmission and the shaft is connected to the first reel via a third transmission.

It is also preferred that the second rotary drive is connected to the hollow shaft by a second transmission and that the hollow shaft is connected to the second winding core by a third transmission.

The object is achieved in terms of method by a method for continuously operating a cast-rolling complex for producing a hot-rolled finished strip according to claim 9. Preferred embodiments are the subject of the dependent claims.

In particular, the object is achieved by a method for continuously operating a cast-rolling composite plant for producing a hot-rolled finished strip having a thickness of 1mm or less, preferably 0.8mm or less, particularly preferably 0.6mm or less, having the following method steps:

continuous casting of a continuous strand with a slab or thin slab cross section from molten steel in a continuous casting system with curved strand guides;

-roughing the slab in a multi-stand roughing train into a continuous roughing strip;

-finish rolling the rough rolled strip into a continuous finished strip in a multi-stand finishing train;

-cooling the continuous finished strip to a coiling temperature in a cooling section;

-winding the continuous finished strip in a rotary coiler having a first and a second winding core;

the method is improved in that the continuous finished strip is cut transversely by means of shears into a leading and a trailing finished strip section, the leading finished strip section being wound onto the first winding core and the trailing finished strip section being wound onto the second winding core.

The upper edge of each winding core is preferably situated on the pass line of the finished strip at the start of winding, i.e. in the so-called start-winding. This enables the turning of the finished strip to be dispensed with.

It is also advantageous to deflect the reeling core of the rotary reel-up during winding on an elliptical, preferably circular, trajectory. The first winding core is typically deflected clockwise from position 180 ° to direction 0 ° during winding, while the second winding core is deflected clockwise from position 0 ° to direction 180 °.

The rotary coiler is particularly well suited for winding very thin and fast finished steel strips, whereby it is advantageous if the thickness of the finished steel strip is < 1mm, preferably < 0.8mm, particularly preferably < 0.6 mm. For thicknesses of < 1mm, it is advantageous if the transport speed of the finished strip is > 8.4 m/s; the preferred conveying speed for a thickness of < 0.8mm is > 10.5 m/s; a particularly preferred conveying speed is > 14m/s for a thickness of < 0.6 mm.

Drawings

The above features, characteristics and advantages of the present invention and the manner of attaining them will become more apparent and the invention will be better understood by reference to the following description of embodiments of the invention taken in conjunction with the accompanying drawings, wherein like reference numerals are used to illustrate, describe, and explain in detail, the present invention. Here:

FIG. 1 shows a schematic view of a cast rolling complex with a rotary coiler;

FIG. 2 shows a detailed illustration of the rotary reel of FIG. 1; and is

Fig. 3a, 3b show a front view and a plan view of the rotary reel with its drive.

Detailed Description

Fig. 1 shows a schematic of a casting and rolling complex of the Arvedi ESP type with a rotary coiler 18. The pouring distributor 2 of the cast composite plant 1 is loaded with liquid steel during the operation of the cast composite plant. In the mold 3, a partially solidified cast strand 4 having a solidified strand shell is formed from the molten steel. The cast strand 4 is continuously drawn out of the mold 3 and is cooled further in the curved strand guide, so that the cast strand 4 finally enters the roughing train 5 in the completely solidified state. In the three-stand roughing train, the cast strand 4 having a slab or thin slab cross section is roughed to form a roughed strip. The uncut rough strip is then heated by means of a plurality of inductors of the induction furnace 8 and descaled in the heated state immediately before the finishing train 11. Good descaling effect is achieved by heating and subsequent descaling of the rough rolled strip. The descaled rough strip enters the five-stand finishing train 11 and is finished there to form a finished strip. The finished strip typically has a thickness between 0.6 and 6 mm.

In particular, when producing very thin finished steel strips with a thickness of < 1mm, < 0.8mm or even < 0.6mm, problems can arise with the hot strip coiler present, since the finished steel strip moves very quickly on the roller table 14 and tends to easily lift up or float (leave) in the region behind the shears 16, in particular after transverse cutting of the finished steel strip by the shears 16. The present invention deals with this problem very effectively and more precisely through the use of a rotary coiler 18.

After finishing in the finishing train 11, the finished strip is cooled in a cooling section 13 to a coiling temperature and dimensioned to a strapping length by a shear 16.

Fig. 2 shows an enlarged view of the discharge region of the cast-rolling composite plant of fig. 1. In order to be able to cut the finished strip from the cooling section on the roller table 14 as free as possible of tension, a pair of

drive rollers

15, 17 is present before and after the shear 19. By means of the pair of drive rollers, a tensile or compressive force can be exerted on the finished strip. For this purpose, at least one roller of the drive roller pair is designed to be driven and can be pressed against the other roller of the drive roller pair by means of an adjusting mechanism. A guide plate 19 is arranged not only before the first drive roller pair 15, between the first drive roller pair 15 and the shear 16, between the shear 16 and the second drive roller pair 17, but also between the second drive roller pair 17 and the rotary coiler 18, said guide plate preventing the finished strip from lifting off the roller table 14.

In contrast to the "normal" coiling mechanism, the winding core of the rotary coiler is arranged in the vertical direction on the pass line of the finished strip 30 at the start of coiling. This eliminates the tilting of the finished strip in the direction below the roller table 14.

When the finished strip is initially wound onto the first winding core 21a, it is pressed towards the winding core by means of four (typically three, four or five) guide rollers arranged on the circumference of the winding core 21 a. The guide rollers can be pressed in a pressure-or force-controlled or regulated manner by hydraulic, pneumatic or electromechanical actuators. After the start of winding the finished strip, the winding

cores

21a, 21b are deflected on a circular path 29 by a rotary drive 27 shown in fig. 3a, 3 b. The first winding core 21a is deflected back about a horizontal axis of rotation 28 and the second winding core 21b is deflected forward about the same axis of rotation 28. The concept "front and rear" relates to the material flow direction of the finished strip.

Shortly before the coiler has reached its final weight, the finished strip is cut transversely into a leading and a trailing section of finished strip by the shears 16. The advancing finished strip section is wound onto the second winding core 21b as shown in fig. 2. The second winding core 21b is "behind" the first winding core 21 a. The subsequent section of finished strip is wound onto the first winding core 21a, which is "in front" of the second winding core 21b and whose winding core is in the vertical direction on the pass line of the finished strip.

In fig. 3a and 3b the drive, the transmission and the reeling core of the rotary reel-up of fig. 1 and 2 are shown. In particular, the rotary reel-up 18 has three drives, namely a variable-

speed rotary drive

20a, 20b for each of the first and second winding

cores

21a, 21b and a rotary drive 27 for deflecting the winding

cores

21a, 21b on a circular path 29. The two

rotary drives

20a, 20b are high speed rotors with a maximum rotational speed of 8001/min; the rotary drive 27 is then a low-speed rotor with a maximum rotational speed of up to 0.11/min.

Fig. 3b also shows the torque flow from the rotary drives 20a, 20b to the winding

cores

21a, 21 b. The torque of the first rotary drive 20a is transmitted to the shaft 25 via a first transmission 24a and from the shaft 25 to the first winding core 21a via a third transmission 24 c. The torque of the second rotary drive 20b is transmitted via a second transmission 24b to the hollow shaft 26 and from the hollow shaft 26 via a third transmission 24c to the second winding core 21 b. The hollow shaft 26 surrounds the shaft 25 at least partially in the region between the second gear mechanism 24b and the third gear mechanism 24 c.

By means of the inventive cast-rolling composite plant and the inventive method for operating a cast-rolling composite plant, thin finished steel strips made of steel and having a thickness of 1mm or less, preferably 0.8mm or less, particularly preferably 0.6mm or less, can be produced very reliably in industrial mass production. Due to the small spacing between the shear and the rotary coiler, the cast-rolling compound plant can be made more compact than a similar plant with typically three sub-coilers. The winding of the finished strip is always started at a defined position, that is to say by means of the preceding winding core, whereby the finished strip has a uniform temperature, which advantageously affects the quality. Finally, the turning of the finished strip towards the down-coiler is prevented by the use of the rotary coiler, whereby the reliability is further improved.

Furthermore, the invention is not limited to casting and rolling plants of the Arvedi ESP type, but can also be used advantageously in CSP plants of the SMS company or QSP or DUE plants of the Danieli company.

Although the invention has been illustrated and described in detail with respect to a preferred embodiment, the invention is not limited by the disclosed example and other variations can be derived therefrom by those skilled in the art without departing from the scope of the invention.

List of reference numerals

1 continuous casting plant

2 pouring distributor

3 crystallizer

4 casting blank

5 roughing train

6 measuring instrument for temperature trend, width and thickness of rough rolling strip steel

7 feed-in and discharge mechanism

8 induction furnace

9 descaling machine

11 finishing line

12 measuring instrument for temperature trend, width, thickness and flatness of finished strip steel

13 cooling section

14 roller table

15. 17 drive roller pair

16 shearing machine

18 rotary coiler

19 guide plate

20a, 20b rotary drive device

21a, 21b core

22a, 22b axis of rotation of the core

23a … 23h guide roller

24a … 24c transmission mechanism

25 shaft

26 hollow shaft

27 slewing drive device

28 axis of revolution

29 track

30 passing line of finished strip steel

31 rotary transmission mechanism

32 rotating swivel bearing mechanism.

Claims

1. A cast-rolling composite plant for producing a hot-rolled finished strip having a thickness of 1mm or less, preferably 0.8mm or less, particularly preferably 0.6mm or less, wherein the cast-rolling composite plant has:

a continuous casting system (1) having an arc-shaped strand guide for continuously casting a strand (4) having a slab or thin slab cross section from molten steel;

-a multi-stand roughing train (5) for roughing the cast slab (4) into a roughing strip;

-a multi-stand finishing train (11) for finishing the rough rolled strip into a finished strip;

-a cooling section (13) for cooling the finished strip;

-a shear (16) for transverse cutting of the finished strip, wherein the shear (16) is arranged after the cooling section (13) in the material flow direction,

characterized in that a rotary coiler (18) for winding the finished strip onto a first and a second winding core (21 a, 21 b) is arranged downstream of the shear (16) in the material flow direction, wherein each winding core (21 a, 21 b) has a separate rotary drive (20 a, 20 b) for rotating the winding core (21 a, 21 b) about its axis of rotation (22 a, 22 b) and the rotary coiler (18) has a rotary drive for deflecting the winding cores (21 a, 21 b) together about a common axis of rotation (28) on an elliptical, preferably circular, path (29).

2. A combined cast and rolling plant according to claim 1, characterized in that the separate rotary drives (20 a, 20 b) are variable speed drives.

3. A cast rolling compound plant according to any of the preceding claims, characterized in that a pair of drive rollers (15, 17) is arranged immediately before the shear (16) and preferably also immediately after the shear.

4. A cast rolling complex apparatus according to any of the preceding claims, characterized in that the rotary coiler (18) is arranged in horizontal direction with respect to the shear (16) such that the spacing between the shear and the reeling core of the rotary coiler at the start of reeling is < 6m, preferably < 3 m.

5. A cast-rolling complex plant according to any one of the preceding claims, characterized in that the rotary coiler (18) is arranged in a vertical direction with respect to the shears (16) in such a way that the upper edge of the reeling core (21 a) is on the pass line of the finished strip (30).

6. Casting and rolling complex according to any of the preceding claims, characterized in that the first rotary drive (20 a) is connected to the first reeling core (21 a) by a shaft (25) and the second rotary drive (20 b) is connected to the second reeling core (21 b) by a hollow shaft (26), wherein the hollow shaft (26) at least partly surrounds the shaft (25).

7. Combined casting and rolling plant according to claim 6, characterized in that the first rotary drive (20 a) is connected to the shaft (25) by a first transmission (24 a) and the shaft (25) is connected to the first reeling core (21 a) by a third transmission (24 c).

8. Combined casting and rolling plant according to claim 6 or 7, characterized in that the second rotary drive (20 b) is connected to the hollow shaft (26) by a second transmission (24 b) and the hollow shaft (26) is connected to the second winding core (21 b) by a third transmission (24 c).

9. Method for continuously operating a cast-rolling composite plant for producing a hot-rolled finished strip having a thickness of 1mm or less, preferably 0.8mm or less, particularly preferably 0.6mm or less, in particular according to one of the preceding claims, having the following method steps:

-continuously casting a continuous strand (4) with a slab or thin slab cross section from molten steel in a continuous casting installation (1) with curved strand guide means;

-roughing the slab in a multi-stand roughing train (5) into a continuous roughing strip;

-finishing the rough-rolled strip steel in a multi-stand finishing train (11) into a continuous finished strip;

-cooling the continuous finished strip to a coiling temperature in a cooling section (13);

-winding said continuous finished strip in a rotary coiler (18) having a first and a second winding core (21 a, 21 b);

characterized in that the continuous finished strip is cut transversely by means of shears (16) into a leading and a trailing finished strip section, wherein the leading finished strip section is wound onto the first winding core (21 a) and the trailing finished strip section is wound onto the second winding core (21 b).

10. Method according to claim 9, characterized in that the upper edge of each winding core (21 a, 21 b) is at the beginning of winding on the pass line of the finished strip (30).

11. Method according to claim 9 or 10, characterized in that the two winding cores (21 a, 21 b) are deflected on an elliptical, preferably circular, trajectory (29) during winding.

12. Method according to any one of claims 9 to 11, characterized in that the thickness of the finished steel strip is < 1mm, preferably < 0.8mm, particularly preferably < 0.6 mm.

13. Method according to claim 12, characterized in that the transport speed of the finished strip is > 8.4m/s, preferably > 10.5m/s, particularly preferably > 14 m/s.