JP3273103B2 - Control method of direct connection type continuous casting and rolling equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the control of a direct connection type continuous casting and rolling equipment.

[0002]

2. Description of the Related Art When manufacturing a hot-rolled steel sheet, generally,
Using a continuous casting machine, casting is continuously performed with a thickness of about 200 to 250 mm, and a steel material obtained by casting is cut, for example, every 10 m to obtain a slab. The slab is sent to the next step, heated to a temperature required for rolling, and then rolled to a thickness of, for example, about 50 mm by a plurality of rough rolling mills. Furthermore, using 5 to 7 finishing mills, the slab is
Roll to a thickness of about m.

However, in the above-mentioned manufacturing method, the rolling step must be performed intermittently for each slab. Also,
Very large amounts of energy are consumed to heat the slab to the temperature required for rolling.

[0004] Therefore, for example, Japanese Patent Application Laid-Open No. 56-119607.
In the technology disclosed in Japanese Patent Laid-Open Publication No. H06-187, a thin slab having a thickness of about 10 mm is manufactured by using a twin-drum type continuous casting facility, and a rolling facility is directly connected to a line on an output side of the continuous casting facility to perform casting and rolling. It is proposed to carry out continuously.

The prior art relating to the twin-drum continuous casting equipment is disclosed in Japanese Unexamined Utility Model Publication No. 62-15842, Japanese Unexamined Patent Publication No. 4-138848, and Japanese Utility Model Publication No. 5-2.
No. 75 is known.

[0006]

In order to carry out the desired rolling, it is necessary to apply an appropriate tension to the slab passing through the rolling mill and to control the tension to be constant. For this reason,
In general rolling equipment, loopers are installed on the upstream side and the downstream side of each rolling mill, respectively, and these loopers are controlled so that an appropriate tension is applied to each part of the slab. However, the installation of the looper complicates the structure of the equipment and requires a large space for installation.

Accordingly, an object of the present invention is to perform casting and rolling continuously, and to eliminate the need for installing a looper in the rolling process.

[0008]

According to the present invention, there is provided a twin-drum continuous casting facility for casting a thin plate, and a feed-through path on the delivery side of the twin-drum continuous casting facility. Rolling equipment (1
6), a pinch roll (14) installed at a position opposite to a threading path between the rolling equipment and the twin-drum continuous casting equipment, and a rolling equipment (1) for rolling down the pinch roll.
5) and a method of controlling a direct-coupling continuous casting and rolling facility having a rotary drive facility (M2) for driving the pinch roll in the rotational direction: the rolling facility is in an open state in accordance with the rolling state of the rolling facility. In some cases, the control of the pinch roll rotary drive equipment is set in a speed control mode, and when the rolling equipment is in a rolling state, the control of the pinch roll rotary drive equipment is set in a current control mode (21). , 28), in the speed control mode, the speed of the pinch roll or the plate to be passed is maintained at a speed target value (40), and in the current control mode, the current of the rotary drive equipment is controlled by the current. Maintain the target value (41).

According to a second aspect of the present invention, the amount of reduction of the pinch roll is selectively set from at least two types, and the pinch roll is connected to a plate (10) coming out of the twin-drum continuous casting equipment and to a tip end thereof. Joint (10) with the dummy sheet (2)
The position of a) is tracked, and the amount of reduction of the pinch roll is set to a relatively small amount of reduction at which no shear occurs at the joint until the position of the joint reaches the winder (21). When the position of the seam reaches the winder, the amount of reduction of the pinch roll is set to a relatively large amount of reduction that does not cause slip of the slab when the slab is reduced by the rolling equipment (24). , 25).

According to a third aspect of the present invention, when at least the reduction amount of the pinch roll is the relatively small reduction amount, the rolling equipment is set to the open state (21), and the reduction amount of the pinch roll is reduced. After the relatively large amount of reduction, the rolling equipment is reduced with a relatively small amount of reduction (2).
6, 27), after the rolling equipment is reduced, the control of the rotary driving equipment for the pinch roll is switched from the speed control mode to the current control mode (28).

According to a fourth aspect of the present invention, after the control of the rotary driving equipment for the pinch roll is switched from the speed control mode to the current control mode, the rolling reduction of the rolling equipment is reduced to a predetermined value. The amount of reduction is switched to a larger value (29, 2A).

The symbols shown in the parentheses indicate the reference numerals of the corresponding elements in the embodiments described later for reference, but each component of the present invention is a specific element in the embodiments. It is not limited to only.

[0013]

In the twin-drum type casting equipment (11) for continuously casting thin plates, particularly for the stable conveyance of the slab until the start of the slab is started by the coiler at the start of casting, and In order to transport the dummy sheet for guiding the slab, a pinch roll is generally provided at a position opposed to the threading path of the slab.
(14) is installed.

As in the present invention, when a rolling facility (16) is installed at a position opposite to a threading path on the exit side of a twin-drum casting facility to directly connect a casting step and a rolling step. When the rolling mill is in the rolling state, the slab can be conveyed even if there is no pinch roll because of the rotational force of the rolling mill. Therefore, in the present invention, when it is necessary to convey a slab or the like by the driving force of the pinch roll (when the rolling equipment is in an open state), the pinch roll is controlled by the speed control mode, and the pinch roll is controlled. When it is no longer necessary to convey the slab or the like by the driving force of the roll (when the rolling equipment is in a rolling state), the pinch roll is controlled by the current control mode.

In the current control mode, the energizing current of the rotary drive equipment is maintained at the current target value (41), so that the torque between the pinch roll and the slab is associated with the current target value. Can be That is, when rolling is performed,
The tension applied to the slab between the mill and the rolling mill is associated with the current target value of the pinch roll control system.
The tension of the slab is controlled by controlling the length of the slab. Therefore,
In order to control the tension of the slab at the time of rolling, it is not necessary to particularly install a looper or the like, and the structure of the equipment is simplified.

According to a second aspect of the present invention, there is provided a plate (10) coming out of the twin-drum type casting facility and a dummy connected to a tip end thereof.
The position of the seam (10a) with the sheet (2) is monitored, and from the start of operation until the seam reaches the winder (1C), the amount of reduction of the pinch roll is measured. A relatively small amount of reduction (for example, 3 tons) at which no shear occurs at the seam due to the reduction, and when the position of the seam reaches the winder, the amount of reduction of the pinch roll is reduced by the slab at the rolling equipment. Is set to a relatively large reduction amount (for example, 4 to 10 tons when the friction coefficient μ between the pinch roll and the slab is 0.2) so that the slab does not slip when the slab is reduced.

That is, since the seam portion is more likely to be sheared than the other portions, the pinch roll is lowered until the seam reaches the winding machine in order to prevent shearing at the seam. The volume needs to be relatively small (eg 3 tons). Also, when the slab is reduced by the rolling equipment, the rotary drive equipment is controlled by the current control mode, whereby a relatively large tension is applied to the slab between the rolling equipment and the pinch roll. Occurs. Therefore, in order to prevent a slip from occurring between the slab and the pinch roll due to the tension of the slab, the rolling reduction of the pinch roll should be relatively large (for example, the friction coefficient between the pinch roll and the slab). μ is 0.
In the case of 2, 4 to 10 tons) is required.

In the third aspect, when the rolling reduction of the pinch roll is the relatively small rolling reduction (3 tons), the rolling equipment is set to the open state, and the rolling reduction of the pinch roll is relatively large. After the rolling reduction is reached (4 to 10 tons), the rolling equipment is lowered with a relatively small reduction amount. After the rolling equipment is in the rolling state, the control of the rotary driving equipment of the pinch roll is controlled by the speed. The mode is switched from the control mode to the current control mode.
When the dummy sheet is mounted on the line, and when the seam passes, it is desirable that the rolling reduction of the rolling mill be in an open state. Also, when starting the pinch roll tension control,
It is desirable to strongly press the slab with a pinch roll to prevent the slab from slipping.

According to a fourth aspect of the present invention, the control of the rotary driving equipment of the pinch roll is performed after the switching from the speed control mode to the current control mode, and the rolling reduction of the rolling equipment is made smaller than before. Switch to a large reduction. Thereby, rolling can be started in a state where a sufficiently large tension is applied to the slab.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows the construction of a direct-coupled continuous casting and rolling plant of one embodiment and the main parts of a control system thereof. Referring to FIG. 1, the main part of this equipment is a twin-drum continuous casting equipment 1.
1, Looper under drum 12, Guide roller 13, Pinch roll 14, Rolling mill (3Hi mill) 16, Discharge looper 1
9. Deflector roll 1A, slab detector (HMD: HotM
(Detector) 1B and a coiler (winding machine) 1C. The pinch roll 14 is provided with a pressing device 15, and the rolling mill 16 is provided with a pressing device 17 and a gap detector 18.

FIG. 2 shows the basic structure of the twin-drum continuous casting equipment 11. This will be described with reference to FIG. A pair of cooling drums 11a and 11b are arranged close to each other and in parallel, and both ends of the cooling drums 11a and 11b are closed by side dams 11c and 11d. Cooling drum 1
The molten metal is supplied to the pool 1 formed by the lavers 1a and 11b and the side dams 11c and 11d from above through a tundish and a nozzle (not shown). The cooling drums 11a and 11b have a built-in cooling device, and the cooling drums 11a and 11b are rotationally driven such that the surfaces facing each other move synchronously downward. The molten metal in the basin 1 is cooled and solidified along the surfaces of the cooling drums 11a and 11b to form a solidified shell. The solidified shell is sent downward while being pressed by the cooling drums 11a and 11b, and is cast as a thin metal strip.
Are formed continuously. In this embodiment, the thickness of the slab 10 is set to about 5 mm. The components not shown include a rotary drive device for both drums, a pressing device for the drum, a side dam pressing device, a molten metal supply device (tundish),
There are a melt supply nozzle, a cooling water supply pipe, and the like.

Referring back to FIG. The slab (strip) 10 cast by the twin-drum continuous casting equipment 11 includes a drum lower looper 12, a guide roller 13, and a pinch roll 1.
4, rolling mill 16, outlet looper 19, deflector roll 1
A and the slab detector 1B pass through the coiler 1C. The under-drum looper 12 is a looper that adjusts the slack of the strip produced immediately below the drum due to the speed difference between the drum and the pinch roll. The pinch roll 14 transports the strip 10 and the dummy sheet until the start of rolling, and
Used for tension control during rolling. The rolling mill 16
The strip 10 having a thickness of 3 to 5 mm is rolled to a thickness of about 2 to 4 mm. The exit looper 19 includes a rolling mill 16 and a coiler 1C.
Is a device that adjusts the slack of the strip 10 caused by the speed difference and maintains the tension constant.

The cooling drums 11a and 11b of the twin-drum continuous casting equipment 11 are driven to rotate by an electric motor M1. The pinch roll 14, rolling mill 16 and coiler 1C are driven to rotate by electric motors M2, M3 and M4, respectively. Electric motors M1, M2, M3 and M
The pulse generators P1, P2, P3 and P4 for generating pulses corresponding to the respective rotation amounts are connected to the drive shaft 4. Each of the electric motors M1, M3 and M4 is a speed control device (ASR: Automatic Speed Regulator).
31, 50 and 55, the electric motor M2
Is a speed control device 40 or a current control device (ACR: Auto
matic Current Regulator) 41.

The speed controller 31 has a drum speed reference output from the drum speed reference calculation circuit 32 and a pulse generator P.
The current supplied to the electric motor M1 is controlled so that the rotational speed of the electric motor M1 obtained from the signal output from the motor 1 coincides with the rotational speed of the electric motor M1. The drum speed reference calculation circuit 32 inputs the result of adding the speed reference 34 and the drum speed correction value 35 by the adder 33, and generates a drum speed reference based on the input.

The speed controller 40 controls the electric motor so that the target speed value output from the adder 37 and the rotational speed of the electric motor M2 obtained from the signal output from the pulse generator P2 match. The current supplied to M2 is controlled. The target speed value applied to the speed control device 40 is a result of adding the PR (pinch roll) speed fine adjustment amount and the output of the speed correction value converter 39 to the drum speed reference. The output of the looper position control circuit 38 is applied to the input of the speed correction value converter 39. The looper position control circuit 38 controls the looper 1
Then, the loop amount obtained from step 2 is compared with its target value to generate a looper position correction value. In the speed correction value conversion 39, the position correction value is converted into a speed correction value.

The current control device 41 compares the current target value inputted thereto with the current flowing through the electric motor M2, and controls the current supplied to the electric motor M2 so that the two coincide. . In the current value conversion 44, the predetermined tension command value 43 is converted into a current value, and a current target value to be applied to the current control device 41 is generated.

In practice, depending on the state of the switch 42,
The control content of the electric motor M2 is switched. That is, switch 4
When the switch 2 is in the first state, the electric motor M2 is controlled by the speed controller 40, and when the switch 42 is in the second state, the electric motor M2 is controlled by the current controller 41. Switching of the switch 42 is performed by the mill rolling force command 4
9 automatically. This will be described later in detail.

The speed controller 50 controls the electric motor so that the speed target value output from the multiplier 47 and the rotation speed of the electric motor M3 obtained from the signal output from the pulse generator P3 match. The current supplied to M3 is controlled. The speed target value of the speed control device 50 is the line reference speed (adder 3
7 is corrected by the multipliers 45 and 47.
The multiplier 45 multiplies the result calculated by the operation unit 46 by the line reference speed, and the multiplier 45 multiplies the result calculated by the operation unit 48 by the line reference speed.

The calculation of the operation units 46 and 48 will be described. The line reference speed is a speed upstream of the rolling mill 16, but since the slab 10 is rolled and thinned by the rolling mill 16, the speed reference of the rolling mill 16 must be changed according to the rolling reduction. . Here, the following data is used as data necessary for correcting the speed reference.

(1) Cast plate thickness (entrance plate thickness): H1 [mm] (2) Mill exit plate thickness: H2 [mm] (3) Slab plasticity coefficient: Q [Ton / mm] (4) Mill constant : M [Ton / mm] (5) Coefficient of advanced ratio: F (6) Gap between rolls: S [mm] The rolling state in this case is represented by the following relational expressions in FIGS.

P = (H2-S) M = (H1-H2) Q (1) MH2-MS = QH1-QH2 (2) (M + Q) H2 = MS + QH1 (3) H2 = MS / (M + Q) + QH1 / (M + Q) (4) H2 / H1 = MS / (M + Q) H1 + Q / (M + Q) (5) H1 / H2 = (M + Q) / (MS / H1 + Q) (6) Here, since H1 / H2 represents the elongation of the strip (strip) in the rolling mill, the relationship between the strip speed V2 on the exit side of the rolling mill and the strip speed V1 on the entry side is expressed by the following equation. It is.

V2 = V1 × H1 / H2 = V1 (M + Q) / (MS / H1 + Q) (7) The advance rate α in the rolling mill is expressed by the following equation using the advance rate coefficient F.

Α = (H 1 −H 2) F / H 1 (8) The roll speed VR of the rolling mill is expressed by the following equation using the advance rate α.

VR = V2 (1 / (1 + α)) (9) Referring again to FIG. 1, the arithmetic unit 46 calculates the strip elongation in the rolling mill 16, and the arithmetic unit 48 calculates the strip elongation in the rolling mill 16. Calculate the correction value corresponding to the advance rate of. The operation unit 46
Is a signal output from the gap amount detector 18.

The speed controller 55 controls the electric motor so that the target speed value output from the adder 54 and the rotation speed of the electric motor M4 obtained from the signal output from the pulse generator P4 match. The current supplied to M4 is controlled. The speed target value of the speed controller 55 is a result of correcting the plate speed V2 on the exit side of the rolling mill obtained from the output of the multiplier 45 by the adders 53 and 54. The adder 53 adds the fine adjustment amount of the coiler speed to the plate speed V2.
Add the speed correction value output by. Speed correction value conversion 51
The output of the looper position control circuit 52 is applied to the input of. The looper position control circuit 52 compares the loop amount obtained from the output looper 19 with its target value to generate a looper position correction value. The speed correction value conversion 51 converts the position correction value into a speed correction value.

In this embodiment, the overall control of the various facilities shown in FIG. 1 is performed using a sequencer (not shown). That is, the speed reference 34, the drum speed correction value 3
5, a tension command value 43, a PR reduction force switching signal applied to the reduction device 15, a mill reduction force command 4 applied to the reduction device 17.
9, the state of the switch 42, various coefficients H1, Q, M, F, etc. are given from the sequencer as needed. FIG. 2 shows the contents of the control performed by the sequencer from the start of the operation to the completion of the start-up to the steady state,
The state change of each part is shown in the time chart of FIG.

Each processing step shown in FIG. 2 will be described. In step 21, first, 0 is output as the mill reduction force command 49, and the reduction of the rolling mill 16 by the reduction device 17 is released. Further, the PR reduction force switching signal is set to a predetermined level, and the reduction of the pinch roll 14 by the reduction device 15 is set to a low reduction state (for example, a reduction amount of 3 tons). Furthermore,
The state of the switch 42 is determined so that the ASR 40 controls the electric motor M2. Further, 0 is set as the tension command value 43.
Is applied. In this state, since casting has not been started, no slab exists on the line. Therefore, the dummy sheet 2 is mounted between the exit of the twin-drum continuous casting equipment 11 on the line and the coiler 1C (see the state at time T0 in FIG. 5). When the dummy sheet 2 is mounted, the pinch roll 14 is driven to rotate forward or reverse as necessary.

When the preparation for mounting the dummy sheet 2 is completed and, for example, a switch indicating the completion of the preparation is turned on by the operation of the operator, the process proceeds to steps 22 to 23, where the operation of the twin-drum continuous casting equipment 11 is performed. That is, casting is started. When casting starts, it is connected to the rear end of the dummy sheet 2,
The formed slab 10 is pulled downward from the twin-drum continuous casting facility 11. Immediately after the casting is started, since the operation state is not stable, a bump-like bulge is formed at the joint 10a between the dummy sheet 2 and the slab 10.

The casting is continuously performed, and the various rotary driving elements on the line are driven according to a predetermined speed reference (target value).
The leading end of the sheet 2 is sequentially wound by the coiler 1C, and the slab 10 is drawn by the dummy sheet 2 and moves downstream on the line. That is, the state changes as at times T1, T2, and T3 shown in FIG. Although there is a bump-like bulge at the seam 10a, the rolling of the rolling mill 16 is open and the rolling of the pinch roll 14 is light, so that the seam 10a There is no particular problem when passing through the rolling mill 16.

In step 24, the process stands by until winding of the slab 10 by the coiler 1C is started. That is, as shown as time T3 in FIG. 5, the process waits until the seam 10a, which is the tip of the slab 10, is wound around the coiler 1C. In this example, the slab detector 1B that detects the presence or absence of the slab 10
After detecting the tip of the slab 10, tracking of the position is started. When the tip of the slab 10 reaches the position where the tip of the slab 10 is wound around the coiler 1C (the state at time T3 in FIG. 5), the process proceeds to the next step 25. move on.

In step 25, the level of the PR reduction force switching signal applied to the reduction device 15 is switched, and the reduction of the pinch roll 14 is switched from low pressure to high pressure (for example, a reduction amount of 4 to 10 tons). In the following step 26, the process waits until the mill rolling force command 49 generated by itself is switched from zero to light reduction (50 tons in this example: sufficiently smaller than the rolling reduction during rolling). Actually, when a predetermined time elapses after the tip of the slab 10 is wound around the coiler 1C, the mill reduction force command 49 is switched from zero to light reduction, and the process proceeds to step 27. In step 27, a predetermined reduction amount (5
0 ton), the control of the screw-down device 17 is continued.
When the reduction is completed, the process proceeds to the next step 28.

In step 28, the switch 42 is switched to switch the control mode of the electric motor M2 for driving the pinch roll 14 to the current control mode (ACR). That is, thereafter, the electric motor M2 is controlled by the control output of the current control device 41. At this time, since the rolling mill 16 is in a reduced state (light reduction) and the pinch roll 14 is in a high pressure state, the pinch roll 14 and the rolling mill are caused by a braking torque applied to the slab 10 from the pinch roll 14. 1
6, the tension of the slab 10 is determined. Pinch roll 14
The braking torque applied to the slab 10 from the slab 10 corresponds to the current flowing through the electric motor M2,
The electric motor M2 is controlled so that the tension of 0 becomes the target value (the tension command value 43). Here, the tension command value 43 is changed to a predetermined set value. That is, the tension control is started.

In the next step 29, the control waits for a mill pressure reduction command to appear. Actually, when a predetermined time elapses after the winding of the slab 10 is started by the coiler 1C, the mill reduction force command 49 is switched from a light reduction to a predetermined set value (a value at the time of rolling). To step 2A. In step 2A, the reduction device 17 is operated until the reduction amount reaches the set value.
Control is continued. When the rolling force reaches the set value, this process ends, and the operation shifts to a steady operation state. Time T shown in FIG.
In the state of No. 3, since the rolling mill 16 is under light pressure, the slab 1
Although the thickness of 0 is the same on the entrance side and the exit side of the rolling mill 16,
At time T4, the reduction of the rolling mill 16 increases to the set value at the time of rolling, so that the slab 10 is rolled by the rolling mill 16,
At the exit side, the thickness is smaller than at the entrance side.

As described above, in this embodiment, the pinch roll
As for the electric motor M2 of the screw 14, the tip of the slab 10
Until it is wound by C, it is driven in the speed control mode. At this time, the slab 10 and the dummy sheet 2 can be transported in a stable state. After the tip of the slab 10 is wound by the coiler 1C, the electric motor M2 of the pinch roll 14 is driven in the current control mode. The tension of 10 can be maintained at the target value. In the case of the conventional equipment, a looper for controlling the tension must be installed on the entrance side of the rolling mill 16.

In the above embodiment, when the tip of the slab is wound around the coiler 1C, the rolling force of the pinch roll is changed, but this timing (position) may be changed as necessary. sell.

[0046]

According to the present invention, when rolling is performed, the tension applied to the slab between the pinch roll and the rolling mill is associated with the current target value of the pinch roll control system. The tension of the slab is controlled by controlling the tension. Therefore, it is not necessary to install a looper or the like in order to control the tension of the slab at the time of rolling, and the structure of the equipment is simplified.

There is a bump-like bulge at the joint between the dummy sheet and the slab, and the thickness of the dummy sheet differs greatly from that of the slab. −
If the joint is pressed strongly, the tension of the cast slab changes abruptly when the seam passes through various rolls, which tends to cause troubles in winding the coiler. However, in the second aspect, since the amount of rolling down of the pinch roll is reduced until winding of the seam is started, it is possible to prevent the occurrence of trouble in conveyance.

According to the third aspect, when the dummy sheet is mounted on the line and when the seam passes, the rolling reduction of the rolling mill can be released, and the pinch roll can be opened.
When starting the tension control of the steel strip, the slab can be strongly pressed by a pinch roll, and the other part of the slab can be sufficiently pressed by the rolling mill.

According to the fourth aspect of the present invention, the control of the rotary driving equipment of the pinch roll is performed after the switching from the speed control mode to the current control mode, so that the rolling reduction of the rolling equipment can be reduced more than before. Since the rolling amount is switched to a large amount, rolling can be started in a state where a sufficiently large tension is applied to the slab.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a continuous casting and rolling facility of an embodiment and a control system thereof.

FIG. 2 is a flowchart showing the contents of control at the start of operation performed by a sequencer.

FIG. 3 is a time chart showing an example of a state change of the equipment of FIG. 1;

FIG. 4 is a perspective view showing a basic structure of a twin-drum continuous casting facility 11 of the embodiment.

FIG. 5 is a front view showing a state transition at the time of starting operation of the facility in FIG. 1;

FIG. 6 is a graph showing a relationship between a plate thickness and a rolling force in a rolling mill.

FIG. 7 is a front view showing a rolling state of the rolling mill.

[Explanation of symbols]

1: Hot water pool 2: Dummy sheet 10: Cast piece 11: Twin-drum continuous casting equipment 11a, 11b: Cooling drum 11c, 11d: Side dam 12: Drum lower looper 13: Guide roller 14: Pinch rolls 15, 17: Roll-down device 16: Rolling mill (3Hi mill) 18: Gap detector 19: Outgoing looper 1A: Deflector roll 1B: Slab detector 1C: Coiler 31, 40, 50, 55 : Speed controller 41: Current controller 33, 36, 37, 53, 54: Adder 42: Switch 45, 47: Multiplier M1, M2, M3, M4: Electric motor P1, P2, P3, P4: Pulse generator

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-319045 (JP, A) JP-A-56-144804 (JP, A) JP-A-56-126016 (JP, A) JP-A-49-49 134557 (JP, A) JP-A-58-47514 (JP, A) JP-A-56-119607 (JP, A) JP-A-4-138848 (JP, A) JP-A-63-80921 (JP, A) Japanese Utility Model Showa 60-103516 (JP, U) Japanese Utility Model Showa 62-15842 (JP, U) Japanese Utility Model Showa 62-164265 (JP, U) Japanese Utility Model Hei 5-275 (JP, Y2) (58) (Int.Cl. ⁷ , DB name) B22D 11/12 B21C 47/02 B22D 11/06 330 B22D 11/20

Claims (4)

(57) [Claims] 1. A twin-drum continuous casting facility for casting a thin plate, a rolling facility installed at a position facing a threading path on the exit side of the twin-drum continuous casting facility, and the rolling facility and the twin-drum continuous casting facility Directly connected continuous type having a pinch roll installed at a position opposite to a threading path between the casting facility, a rolling-down facility for rolling down the pinch roll, and a rotary drive facility for driving the pinch roll in a rotational direction. In the method of controlling a casting and rolling facility, according to the rolling state of the rolling facility, when the rolling facility is in an open state, the control of the rotary drive facility of the pinch roll is set in a speed control mode, and the rolling facility is controlled. When the rolling state is reached, the control of the rotary drive equipment of the pinch roll is set to the current control mode, and in the speed control mode, the speed of the pinch roll or the plate to be passed is maintained at the target speed value. , The current control In a mode, a method of controlling a direct-coupled continuous casting and rolling facility, wherein the current of the rotary drive facility is maintained at a current target value. 2. The rolling amount of said pinch roll is selectively set from at least two types, and a plate coming out of said twin drum type continuous casting equipment and a dummy sheet connected to the tip thereof are set. The position of the seam is tracked, and until the position of the seam reaches the winder, the amount of reduction of the pinch roll is set to a relatively small amount of reduction that does not cause shearing at the seam. 2. The method according to claim 1, wherein when the position reaches the winder, the amount of reduction of the pinch roll is set to a relatively large amount of reduction in which the slab does not slip when the slab is reduced by the rolling equipment. Control method of direct-connection type continuous casting and rolling equipment. 3. When at least the rolling reduction of the pinch roll is the relatively small rolling reduction, the rolling equipment is set to the open state, and the rolling reduction of the pinch roll becomes the relatively large rolling reduction. Then, the rolling equipment is lowered by a relatively small amount of reduction, and after the rolling equipment is in a reduced state, the control of the rotary driving equipment of the pinch roll is performed from the speed control mode to the current control mode. 3. The method for controlling a direct-coupled continuous casting and rolling plant according to claim 2, wherein the operation mode is switched to a negative mode. 4. After the control of the rotary drive equipment of the pinch roll is switched from the speed control mode to the current control mode, the rolling reduction of the rolling equipment is increased more than before. The method for controlling a directly connected continuous casting and rolling facility according to claim 3, wherein the method is switched to: