JP2000343103A - Method for starting slab rolling in twin-drum continuous casting facility, rolling control device, and recording medium - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To enable rolling of cast slabs fed from a cooling twin drum to start automatically after passing through a dummy sheet, without imposing an excessive burden on an inline mill. SOLUTION: Before a dummy sheet 61 attached to the tip of a slab 2 sent out from a twin drum 1 passes through an in-line mill 3, the roll interval of the in-line mill 3 is widened so that the dummy sheet 61 passes through. The slab tip reached the in-line mill 3 without applying an unreasonable load to the in-line mill 3 by narrowing the roll interval of the in-line mill 3 to the target position at the time of rolling as detected by the mill exit thickness gauge 16. Rolling can be automatically started from that point.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for starting rolling of a slab obtained from a continuous casting facility, a rolling control device, and a recording medium.

[0002]

2. Description of the Related Art In a twin-drum continuous casting (STC), as shown in FIG. 6, a pair of cooling drums 1 arranged at a predetermined interval in parallel with each other, and both end faces of these cooling drums 1 And a pair of side weirs 52 disposed in a state of being pressed against the side wall to form a continuous casting mold.

[0003] A molten metal 54 stored in a preheating layer called a tundish 53 is continuously injected to form a pool 55 in the continuous casting mold. The contacting metal melt 54 is solidified thinly on the surface of the cooling drum 1.

[0004] By rotating the pair of cooling drums 1 whose surfaces are solidified with metal as shown by arrows, a strip-shaped slab 56 is formed of the thinly solidified metal and sent downward. A predetermined amount of molten metal 54 is always supplied to the tundish 53 from a molten steel pot 57 called a ladle while the supply amount is adjusted by a stepping cylinder 58.

In the twin-drum type continuous casting equipment as shown in FIG. 6, at the start of casting, the leading end of the strip-shaped slab 56 is attached to a dummy sheet, and the dummy sheet is pulled to an in-line mill 59 for rolling. , The subsequent strip slab 56 can be guided to an in-line mill.

[0006]

FIG. 7 shows the connection between the leading end of the strip-shaped slab 56 and the dummy sheet 61 at the start of rolling. A dummy bar 63, which is considerably thicker than the strip-shaped slab 56, is provided near the position of the leading end of the dummy sheet 61, and the thickness of the strip-shaped slab 56 is provided at the connection between the tip of the strip-shaped slab 56 and the dummy sheet 61. A thicker projection 62 is formed. Therefore, the dummy sheet 61
If the roll gap of the in-line mill 59 is set to a narrow gap from the beginning so that the strip-shaped slab 56 has the target plate thickness when the strip-shaped slab 56 is guided to the in-line mill 59 by using There is a problem that the rolling roll may be damaged due to excessive force.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, the present invention makes it possible to automatically start rolling of a slab sent from a twin drum for cooling after passing through a dummy sheet without imposing a burden on an inline mill. The purpose is to.

Further, the present invention is to provide a stable product by suppressing the meandering of the slab when rolling is started after passing the dummy sheet, and to obtain a good product shape. The purpose is also to be able to do.

[0009]

SUMMARY OF THE INVENTION A rolling start method according to the present invention is a method for starting rolling of a slab produced by a twin-drum continuous casting facility, wherein the slab is attached to the tip of a slab sent out from a twin drum. Before the preceding member passes through the rolling roll, the interval between the rolling rolls is increased, and after passing the preceding member, the interval between the rolling rolls is reduced to a target position during rolling.

[0010] The rolling start method of the present invention is a method for starting rolling of a slab produced by a twin-drum continuous casting facility, wherein the interval between rolling rolls is reduced with respect to the slab sent from the twin drum. When starting, until the rolling roll comes into contact with the slab, move the rolling position of the rolling roll at high speed, and after the rolling roll comes into contact with the slab, contact the rolling position of the rolling roll. Move at a lower speed than before.

The rolling start method according to the present invention is a method for starting rolling of a slab produced by a twin-drum continuous casting facility, wherein the interval between the rolling rolls is reduced with respect to the slab sent from the twin drum. When starting, a negative roll bending force is applied to the rolling roll after the rolling roll contacts the slab.

In one embodiment of the rolling start method of the present invention, after applying the negative roll bending force, the positive roll bending force is applied to reach the target roll bending force.

[0013] In one embodiment of the rolling start method of the present invention, when the interval between the rolling rolls with respect to the slab sent from the twin drum is reduced to start rolling, the rolling roll comes into contact with the slab. Thereafter, the rotation speed of the rolling roll is increased according to the gap between the rolling rolls to reach the target rotation speed.

The rolling start method according to the present invention is a method for starting rolling of a slab manufactured by a twin-drum continuous casting facility, wherein the interval between the rolling rolls is reduced with respect to the slab sent from the twin drum. When starting, the roll cross angle of the rolling roll is set to a target angle before the rolling roll contacts the slab.

A rolling control device of the present invention is a rolling control device for a slab produced by a twin-drum continuous casting facility, comprising a rolling roll for rolling the slab and a tip of a slab sent out from the twin drum. Passage detecting means for detecting that the preceding member attached to has passed the rolling roll,
Roll roll position control means for narrowing an interval between the rolls which has been widened before the passage when the passage detection means detects the passage of the preceding member.

A rolling control device according to the present invention is a rolling control device for a slab produced by a twin-drum continuous casting facility, and controls a rolling roll for rolling the slab and a rolling position of the rolling roll. Rolling roll position control means, with the movement of the rolling position by the rolling roll position control means,
Contact detecting means for detecting that the rolling roll has contacted the slab, and when moving the rolling position of the rolling roll to a target position, when the contact of the rolling roll is detected by the contact detecting means And speed control means for lowering the moving speed of the rolling roll as compared to before the contact.

The rolling control device of the present invention is a rolling control device for a slab manufactured by a twin-drum continuous casting facility, and controls a rolling roll for rolling the slab and a rolling position of the rolling roll. Rolling roll position control means, with the movement of the rolling position by the rolling roll position control means,
Contact detecting means for detecting that the rolling roll has contacted the slab, and when moving the rolling position of the rolling roll to a target position, when the contact of the rolling roll is detected by the contact detecting means Roll bending force applying means for applying a negative direction roll bending force to the rolling roll.

In one embodiment of the rolling control device of the present invention, after the negative roll bending force is applied, the positive roll bending force is applied to reach the target roll bending force.

In one embodiment of the rolling control apparatus according to the present invention, when the rolling contact is detected by the contact detecting means when the rolling position of the rolling roll is moved to a target position, the rolling control is performed. Rotation speed setting means for increasing the rotation speed of the roll according to the gap between the rolling rolls to reach a target rotation speed.

A rolling control device of the present invention is a rolling control device for a slab manufactured by a twin-drum type continuous casting facility, and controls a rolling roll for rolling the slab and a rolling position of the rolling roll. Rolling roll position control means, with the movement of the rolling position by the rolling roll position control means,
Contact detecting means for detecting that the rolling roll has contacted the slab, and when moving the rolling position of the rolling roll to a target position, before the contact of the rolling roll is detected by the contact detecting means Roll cross angle adding means for setting a roll cross angle of the rolling roll to a target angle.

The recording medium of the present invention is a computer-readable recording medium that records a program for causing a computer to execute the procedure of the method for starting rolling of a slab.

The recording medium of the present invention is a computer-readable recording medium in which a program for causing a computer to function as each unit of the slab rolling control apparatus is recorded.

[0023]

Since the present invention comprises the above technical means, the interval between the rolling rolls is reduced to the target position during rolling after the preceding member attached to the tip of the slab passes,
Rolling can be performed immediately after the tip of the slab reaches the rolling roll.

According to another feature of the present invention, when rolling is started, the rolling position of the rolling roll is moved at high speed until the rolling roll comes into contact with the slab. In this case, it is possible to shorten the time required to perform the process, so that it is possible to improve the product yield.

According to another feature of the present invention, after the rolling roll comes into contact with the slab, a negative roll bending force is applied to the rolling roll, and tension is applied in the width direction of the slab. This can suppress the meandering of the slab.

According to another feature of the present invention, the roll cross angle of the rolling roll is set to the target angle before the rolling roll comes into contact with the slab, so that the subsequent change of the roll cross angle is avoided. Then, since the rolling can be performed by the rolling roll set to the predetermined roll cross angle from the start of the rolling, the shape of the product can be favorably controlled.

[0027]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method for starting rolling in a twin-drum continuous casting facility according to an embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic diagram illustrating a configuration of a rolling control device that implements a rolling start method according to the present embodiment.

In FIG. 1, a cooling drum 1 cools a molten metal in a pool 55 and sends it out as a strip slab 2. The fed strip 2 is fed horizontally by a pinch roll 8. Downstream of the pinch roll 8 (the right side in FIG. 1), the in-line mill 3 is installed. Strip slab 2 sent from cooling drum 1
Is adjusted to a desired thickness by the in-line mill 3.

The in-line mill 3 is composed of a work roll 3a, which is a rolling roll provided so as to face the strip-shaped slab 2, and a backup roll 3b installed behind the work roll 3a. It is the work roll 3a that actually contacts the strip slab 2 and performs rolling.

Backup roll 3 above strip slab 2
A hydraulic pressure lowering cylinder 11 is installed at b. The hydraulic pressure reduction cylinder 11 has a function of detecting the positions of the work roll 3a and the backup roll 3b, and also has a reaction force meter. The reaction force from the strip-shaped slab 2 causes the work roll 3a and the strip-shaped slab 2 to be moved. Contact can be detected. The hydraulic pressure reduction cylinder 11 includes a mill hydraulic pressure reduction device 1.
2 is connected, and the mill hydraulic pressure reduction device 12 is connected to the overall control device 7. The mill hydraulic pressure reduction device 12 controls the hydraulic pressure reduction cylinder 11 based on a command (mill pressure reduction REF signal) from the overall control device 7 to vary the roll gap. Therefore, the hydraulic pressure lowering cylinder 11 and the mill hydraulic pressure lowering device 12 function as rolling roll position control means and speed control means.

The roll rotation speed setting means 13 is connected to the backup roll 3b. The roll rotation speed setting means 13 controls the rotation speed of the work roll 3a based on a command from the general control device 7.

Further, a roll bending force applying means 14 is connected to the work roll 3a. The roll bending force applying means 14 adds a later-described roll bending force to the work roll 3a based on a command from the overall control device 7.

A roll cross angle adding means 15 is connected to the work roll 3a. The roll cross angle adding unit 15 sets a roll cross angle, which will be described later, for the work roll 3a based on a command from the overall control device 7.

The above-described roll rotation speed setting means 13, roll bending force applying means 14, and roll cross angle applying means 15 are not shown, but are provided for the work roll 3a and the backup roll 3b on the back side of the strip 2. Also set the roll rotation speed, roll bending force, and roll cross angle described above.

The fact that the connection between the strip-shaped slab 2 and the dummy sheet has passed through the in-line mill 3 can be detected by calculating the moving distance from the drum part based on the number of rotations of the cooling drum 1. The detection result is integrated control device 7
Sent to In this case, means for detecting the number of rotations of the drum and means for calculating the moving distance constitute a passage detecting means. In addition, as the passage detecting means, the mill exit side thickness gauge 16
, The connection between the strip-shaped slab 2 and the dummy sheet may pass through the in-line mill 3 by detecting the plate thickness.

Next, a method of controlling the in-line mill 3 at the start of rolling will be described with reference to FIG.
FIG. 2 shows the rolling position (roll gap) of the in-line mill 3, the rolling load (reaction force from the slab) by the in-line mill 3, the roll bending force, the roll cross angle, and the roll rotation speed at the start of rolling. 6 is a timing chart showing a change in.

In FIG. 2, the horizontal axis indicates the passage of time, and the vertical line indicates the casting start time t ₀ , the hydraulic pressure reduction cylinder 1
Respectively show the work roll 3a and a roll contact detection time t ₁ detects the contact of the strip-shaped cast piece 2, the respective time point of the transition time t ₂ to the steady rolling state at 1.

First, the control of the rolling position of the inline mill 3 by the hydraulic rolling cylinder 11 will be described. At the start of casting, first, a dummy sheet 61 (see FIG. 7) as a preceding member attached to the tip of the strip-shaped slab 2 passes through the in-line mill 3. As described above, the dummy bar 63 is attached near the leading end of the dummy sheet 61, and the projection 62 is formed at the attachment portion between the strip-shaped slab 2 and the dummy sheet 61. Until 62 passes, the gap of the in-line mill 3 is widened.

After the projection 62 has passed through the in-line mill 3, the roll gap of the in-line mill 3 is narrowed at a high speed. After the in-line mill 3 comes into contact with the strip 2, the speed of narrowing the gap of the in-line mill 3 is reduced. The contact of the in-line mill 3 with the strip slab 2 can be detected by monitoring the change in the reaction force obtained from the hydraulic pressure reduction cylinder 11. Thereafter, when the rolling position of the in-line mill 3 reaches a target plate thickness for rolling the strip slab 2 to a target plate thickness, the rolling position is kept constant there.

As described above, in the present embodiment, the strip-shaped slab 2
By moving the rolling position of the in-line mill 3 at a high speed before contacting the workpiece, the operation time can be shortened and the product yield can be improved. In addition, by rolling the roll gap relatively slowly after the contact, it is possible to suppress the meandering of the slab and perform stable rolling.

Next, the fluctuation of the rolling load by the in-line mill 3 will be described. In-line mill 3 is strip-shaped slab 2
The rolling load is zero before contacting. After the contact with the strip-shaped slab 2, the rolling load gradually increases as the roll gap of the in-line mill 3 is tightened. Then, the roll gap of the in-line mill 3 reaches the target reduction position and becomes constant, and at the time of the steady rolling state, the rolling load is stabilized at a constant value.

Next, the work roll 3 of the in-line mill 3
The roll bending force applied to “a” will be described. FIG. 3 is a schematic diagram of the in-line mill 3 for explaining the roll bending force. As described above, the in-line mill 3 is provided with two rolls, the backup roll 3b and the work roll 3a, at positions facing each other across the strip-shaped slab 2, and rotates the backup roll 3b on the front and back surfaces of the strip-shaped slab 2. By doing so, the strip-shaped slab 2 is sent out while being rolled.

The roll bending force is equal to the work roll 3
The force applied to both ends of the drive shaft a in the direction perpendicular to the direction in which the strip 2 extends, and is applied by the roll bending force applying means 14. As shown in FIG. 3 (a), when a roll bending force is applied in a direction (negative direction) away from the strip-shaped slab 2, the central part of the work roll 3a in the plate width is backed up by the backup roll 3b. Because it is pressed in the direction close to
As shown in FIG. 3B, only the both ends of the work roll 3a in the plate width direction are warped, and only the center position of the strip 2 is pressed down by the work roll 3a.

In this embodiment, as shown in FIG. 2, the dummy sheet 61 passes and the work roll 3a comes into contact with the strip 2 in comparison with the roll bending force before the dummy sheet 61 passes. Later, the roll bending force is sharply increased in the negative direction. And
When the roll bending force in the negative direction reaches the target value, the roll bending force is gradually returned in the positive direction to be stabilized at the steady target pressure.

As described above, when the roll bending force is applied in the negative direction, only the center position of the strip-shaped slab 2 in the plate width direction comes into contact with the work roll 3a. Since it is rolled, the central portion has a slightly slack shape. Thereby, tension is generated at both ends of the strip-shaped slab 2, and it is possible to suppress meandering of the strip-shaped slab 2 by the action of the tension. In particular, when the in-line mill 3 comes into contact with the strip-shaped slab 2 at the start of rolling, the behavior of the strip-shaped slab 2 becomes unstable. Therefore, meandering can be avoided by adjusting the roll bending force. .

Thus, the belt-like cast piece 2 can be stably transported after passing through the dummy sheet 61.
In addition, in the steady rolling state after the dummy sheet 61 has passed, the meandering of the strip-shaped slab 2 during rolling is suppressed by applying an appropriate steady-state target pressure that does not cause slack in the upstream strip-shaped slab 2. Is possible.

Next, the roll cross angle of the in-line mill 3 will be described with reference to FIG. FIG. 4A shows a state in which the roll cross angle of the work roll 3a of the in-line mill 3 is 0 °. FIG. 4 (b)
A case where the roll cross angle of the work roll 3a of the in-line mill 3 is set to a predetermined angle (θ) by the roll cross angle adding means 15 is shown.

By appropriately controlling the roll cross angle in addition to the roll bending force, it is possible to perform stable rolling and obtain a good product shape. By setting the target cross angle before the start of rolling, it is not necessary to perform a significant operation during rolling, so that rolling can be performed stably and the product yield can be improved.

As shown in FIG. 2, the roll cross angle is
After the start of casting, the roll gap of the in-line mill 3 is set before narrowing and before the work roll 3 a comes into contact with the strip 2. Thereby, stable rolling can be performed immediately after the start of rolling.

As described above, in this embodiment, the head of the slab is tracked after the start of casting, and the rolling operation is started from the point when the slab passes through the in-line mill 3. here,
First, after changing the roll cross angle to a desired target value, the rolling position is changed at a predetermined speed. Thereafter, the fact that the work roll 3a has come into contact with the strip slab 2 is detected by an increase in the rolling load, the roll rotation speed is accelerated according to the roll gap, and the roll bending force is switched to a specified pressure. After that, the rolling position is changed to the target position at a different rate from the above, and the roll speed and the bending force are also changed to the target values. By performing these operations synchronously, meandering of the strip-shaped slab 2 can be prevented, and the thickness and shape of the product can be optimally controlled. Further, by changing the rolling position change rate, the target rolling position can be quickly reached, so that the product yield can be improved.

Next, a procedure of a method of starting the rolling of the slab using the rolling control device shown in FIG. 1 will be described. FIG. 5 is a flowchart illustrating a processing procedure of a rolling start method in the twin-drum continuous casting facility of the present invention.

First, in step S10, initialization is performed. That is, the roll gap is opened, the roll bending force is set to the equilibrium pressure, the roll cross angle is set to 0 °, and the rotation speed of the work roll 3a is set to a predetermined value.

Next, in step S11, the cooling drum 1
To start casting. As a result, the strip-shaped slab 2 connected to the dummy sheet 61 is sent out below the cooling drum 1.

Next, proceeding to step S12, the number of rotations of the cooling drum 1 is detected, and the moving distance of the strip-shaped slab 2 is calculated, whereby the protrusion 62 at the connection between the strip-shaped slab 2 and the dummy sheet 61 is obtained. The master controller 7 determines whether or not has passed through the in-line mill 3. If the protrusion 62 has passed through the in-line mill 3, step S1
Proceed to 3. If the projection 62 has not passed, the process of step S12 is repeated with the movement of the dummy sheet 61, and it is further monitored whether the projection 62 has passed.

Next, proceeding to step S13, the roll cross angle of the in-line mill 3 is set by the roll cross angle adding means 15 to a target angle at which the work rolls 3a cross each other.

In step S14, the hydraulic pressure reduction cylinder 1
1. In-line mill 3 by mill hydraulic pressure reduction device 12
The roll gap is narrowed by moving the rolling position of the slab at a predetermined speed in a direction approaching the strip 2. By increasing the moving speed here, the inline mill 3
It is possible to shorten the operation time until the work roll 3a comes into contact with the strip slab 2 to improve the product yield.

Next, proceeding to step S15, the increase in the rolling load is detected by the hydraulic pressure reduction cylinder 11, and the work roll 3a of the in-line mill 3
It is determined whether or not contact has been made. When the work roll 3a of the in-line mill 3 comes into contact with the strip 2, Step S16, Step S19, Step S22
Go to each step. If the work roll 3a of the in-line mill 3 is not in contact with the strip 2, the process of step S15 is repeatedly performed until the work roll 3a does.

In step S16, as shown in FIG.
The roll rotation speed is accelerated using the roll rotation speed setting means 13 according to the roll gap. And step S
In step 17, it is determined whether or not the roll rotation speed has reached the target value, thereby determining whether or not the steady rolling state has been reached. If the steady rolling state has been reached, the roll rotation speed is maintained at the target speed in step S18. If the steady rolling state has not been reached, the process returns to step S17.

In step S19, as shown in FIG.
The moving speed of the pressing position of the in-line mill 3 is set to be lower than the speed before the contact with the work roll 3a by the hydraulic pressure lowering cylinder 11 and the mill hydraulic pressure lowering device 12. Then, in step S20, it is determined whether or not the roll gap has reached the target value and has reached a steady rolling state. If the steady state has been reached, the in-line mill 3 is maintained and set at the target reduction position in step S21. . If the steady rolling state has not been reached, the process returns to step S20.

In step S22, as shown in FIG.
The roll bending force applying means 14 switches the roll bending force of the in-line mill 3 to a specified target pressure. Then, in step S23, it is determined whether or not the roll contact target pressure has been reached. If the roll contact target pressure has been reached, in step S24, the roll bending force is gradually increased in the forward direction in accordance with the roll-down position. Let it. If the target pressure during roll contact has not been reached, the process returns to step S23. After the roll bending force is increased in the positive direction in step S24, it is determined in step S25 whether the roll bending force has reached the target pressure and a steady rolling state has been reached. In step S26, the roll bending force is maintained at the steady target pressure.

As described above, according to the present embodiment, the roll gap of the in-line mill 3 can be reduced after the passage of the dummy sheet 61 is detected.
After the start of casting, automatic rolling can be started from the time when the leading end of the strip-shaped slab 2 reaches the in-line mill 3. In addition, when the rolling of the strip slab 2 is started, the roll gap in the in-line mill 3 is widened until the protrusions 62 pass, so that the dummy sheet 61 can be removed without imposing an excessive load on the in-line mill 3. It can be easily passed.

After the dummy sheet 61 has passed, the roll gap is narrowed by moving the rolling position of the in-line mill 3 at high speed, so that the operation time can be shortened and the yield can be improved. Furthermore, after the work roll 3a of the in-line mill 3 comes into contact with the strip 2,
By reducing the moving speed of the rolling position of the in-line mill 3, it is possible to prevent a sudden large force from being applied to the strip-shaped slab 2, suppress the meandering of the strip-shaped slab 2, and perform stable rolling. Become.

Immediately after the in-line mill 3 comes into contact with the strip 2, the roll rotation speed is increased to reach a steady value, and at the same time a negative-direction roll bending force is applied. By synchronously changing the roll bending force gradually to the steady target value, the meandering of the strip-shaped slab 2 can be suppressed.
Thereby, the strip-shaped cast piece 2 can be stably conveyed, and a favorable product shape can be obtained.

Further, by setting a predetermined roll cross angle before the work roll 3a comes into contact with the strip 2 at the start of casting, it is not necessary to largely move the roll cross angle to the target angle during rolling. . In addition, it is possible to prevent the excess thickness portion 17 from being generated at the center position of the strip width of the strip-shaped slab 2 due to the roll bending force applied to the in-line mill 3. Thus, the shape of the product can be optimally controlled from the start of rolling, and stable rolling can be performed.

(Other Embodiments of the Present Invention) The present invention is directed to an apparatus connected to the various devices or a computer in a system so as to operate various devices so as to realize the functions of the above-described embodiments. The scope of the present invention also includes a case where the present invention is implemented by supplying a program code of software for realizing the functions of the above-described embodiment and operating the above-described various devices according to a program stored in a computer of the system or the apparatus. It is.

In this case, the program code itself of the software realizes the functions of the above-described embodiment, and the program code itself and means for supplying the program code to the computer,
For example, a storage medium storing such a program code constitutes the present invention. As a storage medium for storing such a program code, for example, a floppy disk, hard disk, optical disk, magneto-optical disk, CD-ROM,
A magnetic tape, a nonvolatile memory card, a ROM, or the like can be used.

When the computer executes the supplied program code, not only the functions of the above-described embodiment are realized, but also the OS (Operating System) or other operating system running on the computer. Needless to say, even when the functions of the above-described embodiments are realized in cooperation with application software or the like, such program codes are included in the embodiments of the present invention.

Further, after the supplied program code is stored in a memory provided in a function expansion board of a computer or a function expansion unit connected to the computer, the function expansion board or the function expansion unit is specified based on the instruction of the program code. It is needless to say that the present invention also includes a case where the CPU or the like provided in the first embodiment performs part or all of the actual processing, and the processing realizes the functions of the above-described embodiments.

[0069]

According to the present invention, automatic rolling can be started from the point when the tip of the slab reaches the in-line mill after the start of casting. Further, the operation time can be shortened and the product yield can be improved. Further, according to another feature of the present invention, the shape and the like of a product can be optimally controlled, and stable rolling can be performed.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a slab rolling control device according to an embodiment of the present invention.

FIG. 2 is a timing chart showing each characteristic value in the slab rolling control device according to one embodiment of the present invention.

FIG. 3 is a schematic diagram for explaining a roll bending force in a slab rolling control device according to an embodiment of the present invention.

FIG. 4 is a schematic diagram for explaining a roll cross angle in the slab rolling control device according to one embodiment of the present invention.

FIG. 5 is a flowchart showing a procedure of a method for starting rolling of a slab according to an embodiment of the present invention.

FIG. 6 is a schematic diagram showing a partial configuration of a twin-drum continuous casting facility.

FIG. 7 is a schematic view showing a preceding member attached to the tip of a slab.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cooling drum 2 Strip slab 3 In-line mill 7 Overall control device 8 Pinch roll 11 Hydraulic pressure reduction cylinder 12 Mill hydraulic pressure reduction device 13 Roll rotation speed setting means 14 Roll bending force adding means 15 Roll cross angle adding means 16 Mill exit side thickness gauge 61 Dummy sheet 62 Projection 63 Dummy bar

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Takashi Oda 3434 Shimada, Hikari-shi, Nippon Steel Corporation Inside the Hikari Works (72) Inventor Shunji Shoda 3434 Shimada, Hikari-shi, Hikari-shi Nippon Steel Corporation Inside the Shako Works (72) Inventor Shuichi Inoue 3434 Shimada, Hikari-shi

Claims (14)

[Claims] 1. A method for starting rolling of a slab produced by a twin-drum continuous casting facility, wherein a preceding member attached to the tip of a slab sent from a twin drum passes through a rolling roll, A method for starting slab rolling, wherein the interval between the rolling rolls is increased, and the interval between the rolling rolls is reduced to a target position during rolling after passing through the preceding member. 2. A method for starting rolling of a slab produced by a twin-drum type continuous casting facility, the method comprising: Until the rolling roll contacts the slab, the rolling position of the rolling roll is moved at a high speed, and after the rolling roll contacts the slab, the rolling position of the rolling roll is lower than before the contact. A method for starting rolling of a slab, wherein the method comprises: 3. A method for starting rolling of a slab produced by a twin-drum type continuous casting facility, the method comprising the steps of: A method for starting rolling of a slab, comprising applying a negative roll bending force to the rolling roll after the rolling roll contacts the slab. 4. The method according to claim 3, wherein after the negative roll bending force is applied, the positive roll roll bending force is applied to reach the target roll bending force. . 5. When rolling is started by narrowing the interval between the rolling rolls with respect to the slab sent out from the twin drum, after the rolling roll comes into contact with the slab, the rotation speed of the rolling roll is reduced by the rolling speed. Raise according to the gap of the roll,
The method for starting rolling of a slab according to claim 3 or 4, wherein the rotation speed reaches a target rotation speed. 6. A method for starting rolling of a slab manufactured by a twin-drum continuous casting facility, wherein when rolling is started by narrowing the interval between rolling rolls with respect to the slab sent from the twin drum. A method for starting the rolling of a slab, wherein the roll cross angle of the rolling roll is set to a target angle before the rolling roll contacts the slab. 7. A rolling control device for a slab produced by a twin-drum continuous casting facility, comprising: a rolling roll for rolling the slab; and a leading member attached to the tip of the slab sent from the twin drum. Pass detection means for detecting that the passing of the preceding roll, and when the passage detection means detects the passage of the preceding member, the rolling roll position to narrow the interval of the rolling roll that had been widened before passing A control device for rolling a slab, comprising a control means. 8. A rolling control apparatus for a slab produced by a twin-drum continuous casting facility, comprising: a rolling roll for rolling the slab; and a rolling roll position control means for controlling a rolling position of the rolling roll. Along with the movement of the rolling position by the rolling roll position control means, contact detection means for detecting that the rolling roll has contacted the slab, When moving the rolling position of the rolling roll to a target position, And a speed control means for reducing a moving speed of the rolling roll to a lower speed than before the contact when the contact of the rolling roll is detected by the contact detecting means. 9. A rolling control apparatus for a slab produced by a twin-drum continuous casting facility, comprising: a rolling roll for rolling the slab; a rolling roll position control means for controlling a rolling position of the rolling roll. Along with the movement of the rolling position by the rolling roll position control means, contact detection means for detecting that the rolling roll has contacted the slab, When moving the rolling position of the rolling roll to a target position, A rolling control apparatus for a slab, comprising: a roll bending force applying means for applying a negative roll bending force to the rolling roll when the contact of the rolling roll is detected by the contact detecting means. 10. The slab rolling control apparatus according to claim 9, wherein after applying the negative roll bending force, the positive roll bending force is applied to reach the target roll bending force. . 11. When moving the rolling position of the rolling roll to a target position, when the contact detecting means detects the contact of the rolling roll, the rotation speed of the rolling roll is set to the gap between the rolling rolls. The slab rolling control device according to claim 9 or 10, further comprising a rotation speed setting means for increasing the rotation speed in accordance with the rotation speed to reach the target rotation speed. 12. A rolling control apparatus for a slab produced by a twin-drum continuous casting facility, comprising: a rolling roll for rolling the slab; a rolling roll position control means for controlling a rolling position of the rolling roll. Along with the movement of the rolling position by the rolling roll position control means, contact detection means for detecting that the rolling roll has contacted the slab, When moving the rolling position of the rolling roll to a target position, A roll cross angle adding unit configured to set a roll cross angle of the rolling roll to a target angle before contact of the rolling roll is detected by the contact detecting unit. 13. A computer-readable recording medium in which a program for causing a computer to execute the procedure of the method for starting slab rolling according to claim 1 is recorded. 14. A computer-readable recording medium in which a program for causing a computer to function as each unit of the slab rolling control device according to claim 7 is recorded.