KR100990867B1 - 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.

Metal billet, continuous rolling, continuous casting rolling equipment, cushioning time, casting speed, length of metal billet section, predetermined length cutting device, drawing speed

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}

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.

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 additionally performed such that each individual casting billet portion length section is rolled by a time unit corresponding to only a portion of the 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.

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 buffer length of the roller hearth kiln to one or more roller planes.

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.

With the cast metal billet or steel billet solidified it can be cut into the cast billet partial length as required, the cast billet partial length section can be insulated in the roller hearth kiln and heated to the rolling temperature. Continuous casting rolling equipment for semi-continuous rolling or continuous rolling of the metal billet or steel billet necessary for carrying out the above-described method, which can be homogenized and introduced into a rolling mill, is a continuous casting machine, a predetermined length cutting device. to-length line), roller hearth kilns, additional accessory devices, rolling trains, and winding devices at the end are arranged in sequence.

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.                 

A billet guide may be formed such that multiple lengths can be introduced from the exit of the continuous casting machine to the rolling mill at the same height through the roller conveyor of the roller huss kiln.

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

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 to 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 decelerated 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 casting speed (V _c ) and adjustment of 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 to a predetermined length after solidification, and the cast billet part length section 20 is brought to the rolling temperature in the roller hearth kiln 2 for heating and homogenization, and the cast billet part having the rolling temperature. The length section 20 is introduced into the rolling train 3 and rolled, but continues without interrupting continuous casting during the rolling operation, and when the rolling of the preceding multi-length section 21 ends and a new partial length section ( 20) or rolls with casting speed (V _c ) drawn in to rolling train 3 (V _w ), calibration time to maintain sufficient cushioning time for roll change between time points at which multiple length sections 21 are introduced. In the semi-continuous or continuous rolling method by casting of metal billet, in particular steel billet 1a, which is slowed down depending on the replacement time, the buffer length 23 of the roller hearth kiln 2, and the final rolling thickness after cutting the predetermined length. In Increase the final rolling thickness or increase the draw speed (V _w ) into the rolling train to provide sufficient cushioning time for roll change between rolling operations within the casting sequence after cutting to the desired length, or final rolling A method of semi-continuous rolling or continuous rolling of a metal billet, characterized by increasing the thickness and the drawing speed (V _w ) into the rolling train. 2. Method according to claim 1, characterized in that a plurality of coils (22) are produced from the multiple length sections (21). Semi-continuous of the metal billet according to claim 1, characterized in that one or more roller planes (24) are provided and that the cushioning length (23) of the roller hearth kiln (2) is adapted to at least one roller plane (24). Rolling or continuous rolling method. The method of claim 1, 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. 2. A method according to claim 1, 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. The method of claim 1, wherein the final rolling thickness is increased by a maximum of 2.5 times. 7. A method according to claim 6, wherein the final rolling thickness is increased by up to two times and the casting speed (V _c ) is reduced by at least 30%. The method according to claim 1, wherein after cutting to a predetermined length, the reduction of the casting speed V _c , the increase in the pulling speed V _{w into the} rolling train 3, the increase in the final rolling thickness are made individually or in combination, After the end of rolling, the worn roll 3a of the rolling train 3 is replaced, and after the roll replacement is performed, the casting speed V _c is increased to the pulling speed V _w into the rolling train 3. Semi-continuous rolling or continuous rolling method of the metal billet. The cast billet portion length section 20 can be cut into the cast billet portion length section 20 while the cast metal billet or steel billet 1a is solidified, and the cast billet section length section 20 is insulated and homogenized in the roller hearth kiln 2 and Heated to the rolling temperature and introduced into the rolling train 3, the continuous casting machine 1 casts continuously, with one or more roller planes 24 between the continuous casting machine 1 and the rolling train 3. And a roller hearth kiln 2 is provided which provides a cushioning length 23, and the cutting device 14 at the inlet 12a or outlet 12b or the inlet 12a and outlet 12b of the roller hearth kiln 2. In the continuous casting rolling facility for semi-continuous rolling or continuous rolling of the metal billet or steel billet (1a), which is arranged and the rolling train (3) is arranged behind the roller hearth kiln (2), Subsequent to the cutting device 14, a descaling device 15 is provided and a cutting device 16, a cooling straight course 17 and a winding device 18 are arranged behind the rolling train 3, In the case where there are two or more roller planes 24, the rotatable roller conveyors 11 and 13 having the bending unit or the straightening unit and the bending unit and the straightening unit are connected to the inlet 12a of the roller hearth kiln 2; A continuous casting rolling facility for semi-continuous rolling or continuous rolling of a metal billet, which is arranged at the outlet 12b. 10. The rolling mill (10) according to claim 9, wherein the multi-length section (21) is made directly from the outlet (9) of the continuous casting machine (1) through the roller conveyor (11) of the roller huss kiln (2) directly in the roller plane (24) of the same height. Continuous casting rolling equipment for semi continuous rolling or continuous rolling of a metal billet, which can be introduced into 3a). delete delete delete

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