KR20050013576A - Method and casting roller plant for the semi-endless or endless rolling by casting of a metal in particular a steel strip which may be transversely separated as required after solidification - Google Patents

Abstract

The present invention cuts the metal billet (1a) to a predetermined length as needed after solidification, the cast billet portion length section 20 to reach the rolling temperature in the roller hearth kiln (2) for heating and homogenization, the rolling Half by casting of a metal billet, in particular a steel billet 1a, which is introduced into the rolling train 3 with a temperature, and rolls the casting billet part length section 20 having a temperature, and continues without interrupting continuous casting during the rolling operation. Continuous rolling or continuous rolling method and a continuous casting rolling equipment therefor, the time when the rolling of the preceding multi-length section 21 for roll replacement and the new partial length section 20 or multi-length section (21) By slowing down the casting speed (V _c ) so that sufficient buffer time is left for roll replacement between the points of insertion into the rolling mill, a closer match between continuous casting and rolling can be achieved. Will be.

Description

METHOD AND CASTING ROLLER PLANT FOR THE SEMI-ENDLESS OR ENDLESS ROLLING BY CASTING OF A METAL IN PARTICULAR A STEEL STRIP WHICH MAY BE TRANSVERSELY SEPARATED AS REQUIRED AFTER SOLIDIFICATION}

A method of that type is known from EP 0 264 459 B1. In such a method, the casting billet portion is warmed in the tunnel furnace while traversing the length section of the casting billet. The cast billet portion length section is insulated over several times its casting time, for example four times. However, such a method is further performed such that each individual cast billet portion length section is rolled in time units corresponding to only a part of its casting time, such as 1/5, so that the rolling process is performed discontinuously and at the same time It is interrupted with an outage time every time corresponding to the difference between casting time and rolling. Strictly speaking, the method is focused on continuous casting, not matching the rolling process.

The present invention cuts the metal billet into a predetermined length as needed after solidification, and the casting billet portion length section reaches a rolling temperature in a roller hearth kiln for heating and homogenization, and casting with the rolling temperature. Semi-endless rolling or continuous rolling by the casting of metal billets, in particular steel billets, which are rolled by introducing billet section length sections into the rolling train and continuing without interrupting continuous casting during the rolling operation. (endless rolling) method.

BRIEF DESCRIPTION OF THE DRAWINGS An embodiment of the present invention is shown in the accompanying drawings, which will be described in more detail later in the method and apparatus technical aspects. Among the accompanying drawings,

1 is a side view of a continuous casting rolling plant having a roller hearth kiln and a roller plane,

2A is a partial side view along the casting billet when the casting speed is lower than the rolling speed,

2B is the same view when the feed rate of the cast billet portion length section is increased at the rolling speed,

3A is a diagram showing continuous casting and continuous rolling in the case where the casting speed and the rolling speed are the same and two winding apparatuses are provided;

3B is a view showing continuous casting and continuous rolling by two winding facilities,

4A shows the situation when the rolls are replaced and the casting speed is lowered,

4B is a view showing a situation after the rolling replacement is finished and the casting speed is increased,

FIG. 5 is a side view as in FIG. 1 showing a continuous cast rolling mill in an optional embodiment. FIG.

(Explanation of the sign)

1 continuous casting machine 1a casting billet

2 roller hearth kiln 3 rolling train

3a roll 4 dispense container

5 continuous casting molds 6 supporting roll frame

7 Bending Units 8 Straighteners

9 outlet 10 split device

11 roller conveyor 12a entrance

12b outlet 13 roller conveyor

14 length cutting device 15 descaling device

16 Cutting Units 17 Cooling Straight Course

18 winding device 20 part length section

21 multi-length segments 22 coil

23 buffer length 24 roller flat

It is an object of the present invention to match the semi-continuous rolling and the continuous rolling more closely to the situation during rolling so that the rolling process can be adapted to the continuous casting process in time.

Such a set-up objective is such that sufficient cushioning time is left for roll replacement between the end of the rolling of the preceding multi-length section for the roll change and the time when a new partial length section or the multi-length section is fitted into the rolling mill in accordance with the present invention. This is achieved by slowing down the casting speed.

In that case, consideration is given to consideration for the long rolling length section generated by semi-continuous rolling or continuous rolling by generating a plurality of coils from multiple length sections.

By slowing the casting speed depending on the roll change time, including the draw rate to the rolling train and / or the calibration time, and / or the cushioning length of the roller hearth kiln and / or the final rolling thickness after cutting to the desired length. It can further affect the buffer time.

According to another feature, measures are taken to fit the cushioning length of the roller hearth kiln beyond the roller plane.

In addition, in order to obtain the desired cushioning time, it is desirable to slow the casting speed V _c corresponding to the pulling speed V _w into the rolling train by an amount equal to or more than the amount according to the following equation:

here,

ΔV = casting speed reduction

V _w = feed rate into the rolling train

Δt = roll change time

L = the length of each tunnel.

By cutting to a predetermined length between roll uptimes in the casting sequence and then increasing the final rolling thickness and / or the pulling rate into the rolling train, additional time can be earned.

In addition, in one configuration, a combined adjustment of the adjustment of the casting speed and the adjustment of the final rolling thickness is used to optimize the manufacturing capability.

In that case, it is also advantageous to raise the final rolling thickness by up to 2.5 times.

By raising the final rolling thickness up to 2 times and lowering the casting speed to at least 30%, a further cushioning time can be obtained.

According to a practical example, such a method slows down the casting speed after cutting to a predetermined length and / or raises the pulling speed into the rolling train and / or the final rolling thickness, and wears the roll of the rolling train after finishing rolling. It can be applied in the form of raising the casting speed to the drawing speed to the rolling train after the roll replacement.

The cast metal billet or steel billet can be cut into the cast billet part length section as needed in the solidified state, and the cast billet part length section can be insulated in the roller hearth kiln, heated to rolling temperature and homogenized Continuous casting rolling equipment for semi-continuous rolling or continuous rolling of metal billets or steel billets necessary for carrying out the above-described method, which can be introduced into a rolling mill, is a continuous casting machine, a cut-to-length line ), The roller hearth kiln, the additional auxiliary device, the rolling train, and the winding device at the end are arranged sequentially.

In such a case, such continuous casting rolling equipment is provided with a roller huss kiln having one or more roller planes between the continuous casting machine and the rolling train, a predetermined length cutting device at the inlet and / or outlet of the roller huss kiln, and the roller huss kiln Subsequently, each descaling device is provided, followed by a rolling train, which can be operated according to the method described above by having the cutting device, the cooling straight course and the winding device arranged behind the rolling train.

In one configuration, in the case of two or more roller planes, roller conveyors each having a bending unit and / or a straightening unit are arranged at the inlet and the outlet of the roller hearth kiln. Thereby, the billet water can be accurately guided to each roller plane.

The billet guide may be formed such that multiple length sections can be introduced from the exit of the continuous casting machine to the rolling mill through the roller conveyor of the roller hearth kiln at a single height level.

1 is a side view of a continuous casting rolling installation consisting of a continuous casting machine 1 for producing a casting billet 1a, a roller hearth kiln 2, and a rolling train 3 with an accompanying device.

In the continuous casting machine 1, the money is supplied from the casting ladle (not shown) to the dispensing container 4, which is provided with a continuous casting mold 5 and a bending unit 7 downstream of the dispensing container 1. The support roll frame 6 and the straightener 8 are arranged. A predetermined length dividing device 10 is arranged at the outlet 9 of the continuous casting machine 1, and behind it a roller conveyor 11 capable of turning for the inlet 12a of the roller hearth kiln 2 (FIG. 5). As an optional configuration). At the outlet 12b of the roller hearth kiln 2, a roller conveyor 11 and a predetermined length cutting device 14, which are also pivotable, are located. The basic configuration embodiment shown in FIG. 1 works without the rotatable roller conveyors 11, 13.

The rolling train 3 starts after the predetermined length cutting device 14 with the descaling device 15. The descaling device 15 is followed by a rolling train 3 with approximately 5 to 6 roll frames. Behind the rolling train, a cooling straight course 17 and two winding devices 18 following it are provided after the cutting device 16.

The method according to the invention is used for semi-continuous rolling or continuous rolling by casting a liquid metal, in particular molten steel, into a casting billet 1a, in which case the casting billet 1a has a predetermined length cutting device after solidification. In (10) it is cut into the cast billet part length section and fed to the roller hearth kiln (2). Each cast billet portion length section 20 is heated in the roller hearth kiln 2, homogenized and brought to a temperature for rolling in the rolling train 3. During that time continuous casting continues without interruption.

If the roll 3a is worn, the rolling end of the preceding multi-length section 21 and the new partial length section 20 or the multi-length section 21 are inserted into the rolling train 3 for roll replacement. The casting speed (V _c ) is slowed down so that sufficient cushioning time is available for roll change between loading points. Multiple coils 22 may be wound from the multiple length section 21.

The casting speed (V _c ) is the cushioning length (23) and / or of each roll change time and / or roller hus kiln (2), including, for example, the pulling speed (V _w ) and / or the calibration time into the rolling train (3). It slows down depending on the final rolling thickness after cutting a predetermined length. The cushioning length 23 of the roller hearth kiln 2 is fitted beyond the roller plane 24 (see FIG. 1).

In FIG. 2A the casting speed V _c is set equal to or smaller than the pulling speed V _w into the rolling train 3. As soon as charging to the roller hearth kiln 2 takes place, the casting speed Vc can be raised back to the pulling speed V _w as shown in FIG. 2B.

3A shows continuous continuous rolling. The casting billet 1a is guided and rolled at a casting speed V _c equal to the pulling speed V _w to the first roll stand, then cooled, and cut at the cutting device 16. The casting billet 1a is cut at a predetermined length in the predetermined length cutting device 10 and then cast at a reduced casting speed V _c as shown in FIG. 3B, and the cut casting billet part length section 20 is cut. is rolled to the incoming speed (V _w) is wound.

The casting speed Vc is slowed down by an amount equal to or more than the amount according to the following equation:

Where each symbol means:

ΔV = casting speed reduction (m / min)

V _w = pulling speed into the rolling train (m / min)

Δt = roll change time (min)

L = length of the tunnel into m.

If the pulling speed (V _w ) = 10 m / min, roll change time (Δt) = 10 min, and roller hearth length (L) = 200 m, the casting speed (V _c ) is decelerated by 3.33 m / min or more Should be.

4A shows replacing the rolls. The casting speed V _c is 6.67 m / nin according to the calculation described above, and thus lower than the pulling speed V _w . In FIG. 4B after the roll change, the casting speed V _c is raised back to the pulling speed V _w .

After cutting to a predetermined length between roll uptimes in the casting sequence, the final rolling thickness and / or the pulling speed V _w into the rolling train 3 is raised.

However, a combination of adjustment of the casting speed V _c and adjustment of the final rolling thickness may be used to optimize manufacturing capability. In that case, the final rolling thickness can be raised by up to 2.5 times. Another option is to increase the final roll thickness by up to twice and reduce the casting speed to at least 30%.

In another embodiment, after cutting to a predetermined length, the casting speed V _c is reduced and / or reduced, the drawing speed V _w and / or the final rolling thickness to the rolling train 3 are increased, and after rolling is finished. The worn roll 3a of the rolling train 3 is replaced, and after the roll replacement is carried out, measures are taken to raise the casting speed V _c to the pulling speed V _w into the rolling train 3.

In the state where the cast metal billet or steel billet is solidified, it can be cut into the cast billet part length section 20 as needed as the casting billet 1a, and the cast billet part length section 20 is a roller hustle kiln 2 Continuous casting rolling equipment for semi-continuous rolling or continuous rolling of metal billets or steel billets, insulated in a heating furnace, heated to a rolling temperature, homogenized and introduced into a rolling train 3, is continuously cast in a continuous casting machine 1. It is assumed that this is done. For that purpose, a roller hearth kiln 2 having at least one roller plane 24 is arranged between the continuous casting machine 1 and the rolling train 3, and the inlet 12a and / or outlet of the roller hearth kiln 2 is arranged. A predetermined length cutting device 14 is provided at 12b, and a descaling device 15 is provided, respectively, following the roller hearth kiln 2, followed by a roll frame, and behind the rolling train 3 The cutting device 16, the cooling straight course 17, and the winding device 18 are disposed.

The inlet and outlet side roller conveyors 11, 13 have bending units and / or straightening units 7, 8 which can be adjusted in and out to the respective roller planes 24. That is, the rotatable roller conveyors 11 and 13 have bending units and / or straightening units 7, respectively, at the inlet 12a and the outlet 12b of the roller hearth kiln 2 having two or more roller planes 24. 8).

According to the optional configuration shown in FIG. 5, the multi-length section 21 is a roller conveyor capable of turning the roller hearth kiln 2 from the outlet 9 of the continuous casting machine 1 on a plurality of roller planes 24. Through 11) and via a pivotable roller conveyor 13 to the rolling train 3.

Claims (13)

The metal billet 1a is cut into a predetermined length as required after solidification, and the cast billet portion length section 20 is brought to the rolling temperature in the roller hearth kiln 2 for heating and homogenization, having the rolling temperature Semi-continuous rolling by casting of the metal billet, in particular the steel billet 1a, which is introduced and rolled into the rolling train 3 to the casting billet section length section 20, without continuing the continuous casting during the rolling operation. Or in the continuous rolling method, Sufficient buffer time is left for roll replacement between the end of rolling of the preceding multi-length section 21 for roll replacement and the point at which the new partial length section 20 or the multi-length section 21 is fitted into the rolling mill. A method of semi-continuous rolling or continuous rolling of a metal billet, characterized by slowing down the casting speed (V _c ). 2. Method according to claim 1, characterized in that a plurality of coils (22) are produced from the multiple length sections (21). 3. The roll hush kiln 2 and / or the respective roll change time according to claim 1 or 2, including the casting speed V _{c including} the pulling speed V _w and / or the calibration time into the rolling train 3. A method of semi-continuous rolling or continuous rolling of a metal billet, characterized in that the speed is reduced depending on the buffer length and / or the final rolling thickness after cutting the predetermined length. 2. Method according to claim 1, characterized in that the cushioning length (23) of the roller hearth kiln (2) is fitted over the roller plane (24). The method according to any one of claims 1 to 4, wherein the casting speed V _c is slowed down by an amount equal to or more than the amount according to here, ΔV = casting speed reduction V _w = feed rate into the rolling train Δt = roll change time L = semi-continuous rolling or continuous rolling method of the metal billet, characterized in that the length to the tunnel. The method according to any one of claims 1 to 5, characterized in that the final rolling thickness and / or the pulling speed into the rolling train (V _w ) are raised after cutting to a predetermined length between roll uptimes in the casting sequence. Semi continuous rolling or continuous rolling method of the metal billet. 7. A method according to claim 6, wherein a combination of adjustment of the casting speed (V _c ) and adjustment of the final rolling thickness is used to optimize the manufacturing capacity. 8. Method according to claim 6 or 7, wherein the final rolling thickness is increased by a maximum of 2.5 times. The method according to claim 6 or 7, wherein the final rolling thickness is increased by a maximum of 2 times and the casting speed (V _c ) is reduced to at least 30%. 10. The method according to any one of the preceding claims, wherein after cutting to a predetermined length, the casting speed (V _c ) is reduced and / or reduced, the drawing speed (V _w ) and / or final rolling into the rolling train (3). Increase the thickness, replace the worn roll 3a of the rolling train 3 after finishing rolling, and after the roll replacement is carried out, the casting speed V _c is changed into the pulling speed V _w into the rolling train 3. Semi-continuous rolling or continuous rolling method of a metal billet, characterized in that the raising. In the state where the cast metal billet or steel billet 1a is solidified, it may be cut into the cast billet part length section 20 as necessary, and the cast billet part length section 20 is insulated from the roller hearth kiln 2. Semi-continuous rolling of a metal billet or steel billet 1a, which can be heated to a rolling temperature, can be homogenized and introduced into a rolling train 3, in which the continuous casting machine 1 casts continuously Or in a continuous casting rolling facility for continuous continuous rolling, Between the continuous casting machine 1 and the rolling train 3 a roller hearth kiln 2 having one or more roller planes 24 is arranged, inlet 12a and / or outlet 12b of the roller hearth kiln 2. And a descaling device 15 are provided, respectively, followed by a roller length kiln 2, followed by a rolling train 3, followed by a rolling train 3. A continuous casting and rolling facility for semi-continuous rolling or continuous rolling of a metal billet, wherein the cutting device 16, the cooling straight course 17, and the winding device 18 are disposed. 12. The inlet 12a and outlet 12b of the roller hearth kiln 2 according to claim 11, wherein the roller conveyor 11, each having a bending unit and / or a straightening unit, when there are two or more roller planes 24. Continuous casting rolling equipment for semi-continuous rolling or continuous rolling of the metal billet, characterized in that disposed in. 13. The rolling mill 3a according to claim 11 or 12, wherein the multiple length sections 21 are through a roller conveyor 11 of the roller hearth kiln 2 from the outlet 9 of the continuous casting machine 1 at a single height level. Continuous casting rolling equipment for semi continuous rolling or continuous rolling of a metal billet, characterized in that it can be introduced to).