JP2000298519A - Method for controlling threading position of steel strip - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stably control the passing position of a steel strip and to prevent the steel strip from being deformed. SOLUTION: A CPC device 19 is arranged on a route for continuously threading a strip to control the centering of the passing position. A pivot 32 is arranged on one end of a roll shaft 31 of a CPC roll 30, another end is deformed by a CPC cylinder 33 to change the inclination of the shaft 31 and change the threading position of the strip. The centering position is calculated from the position detection values of both the ends of the strip detected by respective detectors 34, 35. When a deviation is larger than a reference value, an operation command value to be applied to the cylinder 33 is divided by a fixed period and steps are controlled so as to gradually execute centering. Consequently a sudden change in the position can be evaded, thus stable control can be attained and the deformation of the strip can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling the position of a metal strip passing through a metal strip, which suppresses the displacement of the passing position of the metal strip when a process such as rolling is performed by continuously passing the metal strip. About.

[0002]

2. Description of the Related Art Conventionally, in the manufacturing process of metal materials, mechanical processing such as rolling, metallurgical heat treatment, or chemical surface treatment has been performed continuously in the form of strip-shaped metal strips called strips. Is going. Since the length of the metal band is longer than the length of the portion passed through the processing device, the metal band is continuously fed out of the state wound on the coil and supplied, and is wound again on the coil after the processing is completed. . However, if the product is to be shipped after the processing, the metal band may be cut after the processing.

In the process of continuous passing of the metal strip, it is necessary to control the metal strip so that the meandering phenomenon in which the position of the metal strip is shifted in the width direction during the passing does not occur. As the control of the deviation, there are known CPC for controlling the centering of the metal band, that is, the position of the center line, and EPC for controlling the edge of the metal band, ie, the position of the ear. As a method for changing the passing position of the metal band for CPC or EPC, a payoff reel method, a steering roll method, and a tension reel method are known. The payoff reel system is
Control is performed to adjust the threading position by moving the entire payoff reel that continuously rewinds and rewinds the metal band from the coil state. In the steering roll method, a guide roll is provided in the middle of the threading path, and the roll position is shifted in the axial direction or the axis is inclined to change the threading position of the metal band wound on the roll Control. In the tension reel system, control is performed by shifting the position of a tension reel that winds a metal band and changing the passing position of the metal band.

FIG. 9 (a) shows the outline of the control of the passing position of the metal strip in FIG. When the strip 1 as a metal strip is continuously passed, the CPC controls so that the position of the center line 1a does not deviate from the center position of the apparatus. In the EPC, the position of the edge 1b on one side or the edge 1c on the other side in the width direction of the strip 1 is controlled so as not to deviate from the ear alignment reference position of the apparatus.

[0005]

The control of the passing position of the metal strip by CPC or EPC is performed partially on the metal strip continuously passed in the length direction. In addition, there is a time lag between the detection of the shift and the actual movement of the metal strip passing position. For this reason, even if the shift of the passing position of the metal band is detected and controlled to be reduced, the shift is small at the stage where the passing position of the metal band is actually moved. As a result of the correction, the deviation may increase in the reverse direction.
Further, when trying to adjust the deviation with respect to the soft metal band, the metal band may be deformed.

When continuously passing a metal strip, the metal strip is sequentially fed from a plurality of coils, and between different coils, the tail end of the metal strip fed from a preceding coil and the coil fed from a subsequent coil. In some cases, the tip of the metal strip to be welded is joined by welding. For example, as shown in FIG. 9B, when the tail end of the preceding strip 1 and the front end of the succeeding strip 2 are joined by welding, edge cutting is performed to avoid stress concentration due to the edge effect at the welded portion. Parts 4 are provided on both sides of the welding line 3. When the EPC control is performed on the edge cut unit 4, the positions of the strips 1 and 2 are handled so as to be largely changed, and the displacement of the subsequent strip 2 is increased. FIG.
As shown in (c), when the width of the preceding strip 1 is different from the width of the succeeding strip 2 or when the joining position is displaced, the center line and the edge portion before and after the welding line 3 are located. May greatly vary. If these fluctuations are detected and control is performed to immediately eliminate the fluctuations, the fluctuations will be promoted, and it will not be possible to stably pass the sheet or the metal band that is passed will be deformed. Or may be done.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method of controlling a metal strip passing position which can stably pass a metal strip and prevent deformation of the metal strip.

[0008]

According to the present invention, a position moving device capable of moving the position of a metal band in the width direction is installed on a path for continuously passing a metal band, and In the method of controlling the passing position of a metal strip, which detects a displacement in the width direction of the position and gives an operation command value to the position moving device to control the displacement to be small, the detected displacement is determined from a predetermined displacement reference value. A step control of dividing an operation command value to the position moving device and intermittently giving the command value at a preset time interval.

According to the present invention, a moving device capable of moving the position of the metal strip in the width direction is provided on the path for continuously passing the metal strip. When a shift in the width direction of the passing position of the metal strip is detected, an operation command value is given to the moving device so as to reduce the shift. If the detected deviation is larger than a predetermined deviation reference value, step control is performed in which an operation command value to the position moving device is intermittently divided at predetermined time intervals. When the deviation is large, step control for dividing and giving the operation command value is performed.
The displacement is intermittently performed, and it is possible to gradually return to the predetermined passage route. Since the return to the predetermined passing route is not suddenly performed, the deformation of the metal band can be prevented.

In the present invention, the metal strip is sequentially fed from a plurality of coils, and includes a tail end of a metal strip fed from a preceding coil and a tip of a metal strip fed from a subsequent coil. The step control is performed when the plate is continuously passed while being joined by welding and the change in the plate width at the welded portion is larger than a predetermined width reference value.

According to the present invention, a metal strip passing plate is sequentially fed from a plurality of coils, and the tail end of the metal strip from the preceding coil and the tip of the metal strip from the subsequent coil are joined by welding. While performing continuously, when the change in the plate width at the welded portion is larger than the width reference value, if a deviation larger than a predetermined deviation reference value is detected, the deviation is gradually eliminated by step control. The control is less likely to be unstable when passing through the welded portion, and the metal strip is less likely to be deformed.

Further, the invention is characterized in that when the material of the metal strip is a predetermined soft material, the movement range of the position moving device is limited.

According to the present invention, when the material of the metal band is a predetermined soft material, the moving range for moving the passing position of the metal band by the position moving device is limited. On the other hand, it is possible to return the threading position to the reference position without causing deformation.

Further, in the present invention, the shift in the width direction of the passing position of the metal strip is a shift between the center line in the width direction of the metal strip and the center line of the passing path.

According to the present invention, it is possible to stably suppress the centering position of the metal strip called CPC or the like from the center of the threading path. Since the position of the center of the metal strip in the width direction is stably controlled, even if the width of the metal strip changes in the middle of the passing, stable passing can be performed and deformation of the metal strip can be prevented.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1 and 2 show a schematic configuration of a continuous rolling facility 10 for controlling a threading position of a metal strip as an embodiment of the present invention. FIG. 1 is a simplified side view, and FIG. 2 is a simplified plan view. In the continuous rolling equipment 10, strips 11, which are metal strips, are wound on a plurality of payoff reels 12 and 13 by coils 14 and 15, respectively.
It is fed from the wound state and supplied. For example, when the strip 11 is fed from the coil 14 mounted on one payoff reel 12 and then the strip 11 is fed from the coil 15 mounted on the other payoff reel 13, the strip from the preceding coil 14 is The joining between the tail end of the strip 11 and the tip of the strip 11 fed from the subsequent coil 15 is performed by flash butt welding by a flash butt welding machine 16. In the flash butt welding, the tail end of one strip and the tip of the other strip are abutted and energized to instantaneously melt.

When welding the strip 11 with the flash butt welding machine 16, it is necessary to temporarily stop the passing of the strip 11. Strip 1 for welding
A continuous looper device 17 and a vertical looper device 18 are provided in the continuous rolling equipment 10 to continue the continuous threading of the strip 11 while stopping one threading. The horizontal looper device 17 and the vertical looper device 18 are provided with a plurality of rollers movable in the horizontal direction or the vertical direction, and the like.
The strip 11 having a certain length can be stored while being passed. While the passing of the strip 11 is stopped for welding by the flash butt welding machine 16, the strip 11 stored in the horizontal looper device 17 and the vertical looper device 18 is drawn out to a subsequent process. In the continuous rolling equipment 10 of the present embodiment, the horizontal looper device 17 and the vertical looper device 18
A CPC device 19 for controlling the centering position of the strip 11 is provided as a position moving device between the two.

The strip 11 drawn from the vertical looper device 18 is supplied to a rolling device 20 and is continuously rolled. The rolling device 20 includes a plurality of rolling mills 21, 22, 2
3, 24, 25 and 26 are provided, and the strip 11 is finally wound on a tension reel 28.

As shown in FIG. 2, in the continuous rolling equipment 10, the driving devices 12a, 13
a, drive devices 21a, 22a, 23a, 24a, 25a, 26 of the rolling mills 21, 22, 23, 24, 25, 26
a, and a driving device 28a of the tension reel 28
It is arranged on one side with respect to the threading line from the payoff reels 12 and 13 to the tension reel 28. Each driving device 12a, 13a, 21a, 22a, 23a, 2
The direction in which 4a, 25a, 26a, and 28a are arranged is called a drive side (DS) for convenience with respect to the threading line. On the opposite side of the drive side with respect to the threading line, a work area is provided for pulling out the rolling rolls of the rolling mills 21, 22, 23, 24, 25, 26 and performing work. ).

FIG. 3 shows a schematic configuration of the CPC device 19 of FIG. The CPC roll 30 has a cylindrical shape, and the strip 11 is wound around a part of the outer peripheral surface thereof, for example, over a range of 1/3. That is, the strip 11
Is the angle θ between the entrance side and the exit side of the CPC roll 30.
Is about 120 degrees.

The roll axis 31 of the CPC roll 30 is substantially parallel to the surface of the strip 11. A pivot 32 is provided at one end of the roll shaft 31, and the roll shaft 31 can be oscillated by the hydraulically driven CPC cylinder 33 around the pivot 32. CP
The base end of the C cylinder 33 is fixed to the frame of the device,
The leading end is connected to the other end of the roll shaft 31. When the roll shaft 31 of the CPC roll 30 swings and displaces by the CPC cylinder 33, the roll shaft 31 is inclined with respect to the surface of the strip 11, and the passing position of the strip 11 can be shifted. That is, in the CPC device 19, the CPC roll 3
In this case, the steering roll position control of the steering roll system is performed by the control of 0. It is to be noted that a center pivot system in which a fulcrum for swinging displacement is provided at the center of the roll shaft 31 instead of an end pivot system is also known.

The centering state of the strip 11 passed through the CPC roll 30 is detected by detectors 34 and 35. The detectors 34 and 35 are respectively arranged at the upper ends in the width direction of the strip 11, and optically detect the positions of the edges at both ends. The center of the edge position of the strip 11 detected by the detectors 34 and 35 on both sides is detected as the center position.

FIG. 4 shows the CPC device 19 with the strip 11.
2 shows an electrical configuration related to control for performing centering at the time of sheet passing. Detection outputs from the detectors 34 and 35 are input to the control device 40. The control device 40 also receives a detection output from a strip speed detector 37 that detects the strip speed of the strip 11 in the continuous rolling facility 10. The control device 40 calculates the deviation of the center line of the strip 11 based on the detection outputs of the detectors 34 and 35,
An operation command value for eliminating the deviation is given to the hydraulic device 43 for controlling the C cylinder 33. In the CPC device 19 according to the present embodiment, when the detected deviation is large, step control for intermittently providing the operation command value at a constant cycle is performed.

The control device 40 is connected via a communication line 41 to a higher-level production management device 42 for performing production planning and the like. From the production management device 42, data indicating the specifications and the like of the strip 11 passed through the continuous rolling equipment 10 is provided. The production management device 42 acquires data indicating the specifications of the coils 14 and 15 according to a production plan and the like.
The setting of operating conditions of each of the rolling mills 21 to 26 of the rolling device 20 and the like are performed. When the plate width of the strip 11 is significantly different between the coils 14 and 15, the control device 40
When a deviation is detected when the welded portion passes through the CPC device 19, the centering is controlled by step control. Further, when the material of the strip 11 is, for example, intermediate annealing, since the material is soft, the stroke of the CPC cylinder 33 is regulated so that the strip 11 is not deformed.

FIG. 5 shows a schematic procedure of the control performed by the control device 40 of FIG. When the control of the CPC device 19 is started in step s1, in step s2, the detector 34,
A strip deviation signal calculated based on the detected value of 35 and indicating a centering positional deviation is input. In step s3, a predetermined time interval, for example, 1
At a second interval, a deviation signal value represented by the strip deviation is sampled. In step s4, it is determined whether or not the absolute value of the difference ΔL of the strip deviation sampled in step s3 at one-second intervals is larger than a preset deviation reference value Ls. The shift reference value Ls is set to, for example, 20 mm in consideration of the fact that the width of the edge cut portion 4 as shown in FIG. 9B is about 30 mm.

When it is determined in step s4 that the absolute value of the strip deviation ΔL is larger than the deviation reference value Ls, an operation command value to be given to the CPC cylinder 33 for swingingly displacing the roll shaft 31 of the CPC roll 30 in step s5. Is performed intermittently. If it is determined in step s4 that the absolute value of the strip deviation ΔL is not larger than the reference value Ls, control is performed to give an operation command value calculated corresponding to the strip deviation ΔL to the CPC cylinder 33 in step s6. When the process of step s5 or step s6 is completed, in step s7, when it is determined that the material of the strip 11 to be passed is the intermediate annealing material, the stroke of the CPC cylinder 33 is restricted in step s8. When step s8 is completed, or when it is determined in step s7 that the material is not an intermediate annealed material, it is determined in step s9 whether or not the welded portion passes through the CPC device 19. When it is determined that the welding portion has passed, in step s10, the change Δ in the plate width between the front and rear strips.
It is determined whether W is greater than a preset width reference value Lw. When it is determined that the change ΔW in the plate width is larger than the width reference value LW, step control similar to step s5 is performed in step s11 for a predetermined time, for example, 10 seconds.
When step s11 ends, or when the condition is not satisfied in step s9 or step s10, the process returns to step s2 and repeats the CPC control.

FIG. 6 shows a control sequence performed by the control device 40 of FIG. In the step control, FIG.
As shown in (a), sampling is performed at one second intervals.
When the strip deviation ΔL> Ls, as shown in FIG. 6B, an operation command value to the CPC cylinder 33 is intermittently given so that the strip 11 approaches the centering position by a stepwise position change. I do. Step s in FIG.
In the normal control state as shown in FIG. 6, as shown in FIG. 6 (c), since the operation command value is given once, when the deviation is large, it is necessary to perform a large movement once. In actual control, when a movement involving a large change in position is performed, the shift in the reverse direction becomes large, and the shift fluctuates while changing the sign, and it takes time until it is stabilized. In addition, since a large change occurs, an excessive force is applied to the strip 11 to cause deformation or the like, or the strip 11 comes into contact with a position regulating member such as a guide provided on the side of the passing plate path, thereby causing a bend. Deformation may occur. If step control is performed stepwise, the control value gradually approaches the reference value, and stable control can be performed.

FIG. 7 shows the relationship between the detected amount of the strip deviation and the control amount for the CPC cylinder 33 in the present embodiment.
At time t0, the weld between the tail end of the preceding strip 11 and the tip of the succeeding strip 11 passes, and after passing through the weld, the strip deviation becomes, for example, as shown in FIG. 7A, for example, on the work side (WS) side. About 36 mm. Since this displacement is larger than the above-mentioned displacement reference value Ls of 20 mm, as shown in FIG.
An operation command value to PC cylinder 33 is given. As a result of the step control, the strip deviation gradually decreases. Note that after the strip 11 has been switched at the weld between the one from the preceding coil and the one from the following coil, the deviation is large, but after that, a large deviation that requires step control is not significant. Has not occurred.

FIG. 8 shows a state in which the control in the CPC device 19 is not performed for comparison with FIG. When the tail end of the preceding strip 11 approaches, the strip deviation increases and reaches, for example, about 52 to 68 mm toward the work side (WS) as shown in FIG. FIG. 8B
As shown in (1), when the CPC control is not performed, the strip deviation becomes large and becomes unstable. In the present embodiment, since the CPC control is performed by the step control, the strip deviation can be suppressed, and the control can be performed to a stable passing position. It should be noted that a similar effect can be obtained by applying the present invention when performing EPC control.

[0030]

As described above, according to the present invention, when the deviation of the metal band is large, the deviation is reduced by the step control, so that the deviation of the metal band is gradually eliminated. Since the state does not become unstable due to a sudden change, it is possible to stably pass the metal strip. In addition, since the metal band is not moved in the width direction, it is possible to prevent the metal band in the passing plate from being easily deformed.

Further, according to the present invention, when metal strips having different widths are welded and processed continuously, it is possible to prevent instability of control at a welded portion and prevent deformation of the metal strip. .

Further, according to the present invention, deformation of the soft metal band due to abrupt position correction can be prevented by limiting the moving range of the position moving device.

Further, according to the present invention, the deviation of the center line in the width direction of the metal band from the center line of the threading path can be stably eliminated by the step control, and the deformation of the metal band can be prevented. .

[Brief description of the drawings]

FIG. 1 is a simplified side view showing a schematic configuration of a continuous rolling facility 10 to be subjected to threading position control as one embodiment of the present invention.

FIG. 2 is a simplified plan view showing a schematic plane arrangement of the continuous rolling equipment 10 shown in FIG.

FIG. 3 is a simplified perspective view showing a schematic configuration of a CPC device 19 provided in FIGS. 1 and 2;

FIG. 4 is a block diagram showing a schematic electrical configuration for controlling the CPC device 19 of FIG. 3;

FIG. 5 is a flowchart showing a control procedure performed by the control device 40 of FIG.

FIG. 6 is a time chart showing a sequence operation performed by the control device 40 of FIG. 4;

FIG. 7 is a time chart showing a control state performed by the control device 40 of FIG.

FIG. 8 is a time chart showing the displacement of the strip 11 when the step control of the present embodiment is not performed.

FIG. 9 is a diagram showing a target of conventional strip position control and a shape of a welded portion.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Continuous rolling equipment 11 Strip 12,13 Payoff reel 14,15 Coil 16 Flash butt welding machine 17 Horizontal looper device 18 Vertical looper device 19 CPC device 20 Rolling device 28 Tension reel 30 CPC roll 31 Roll axis 32 Pivot 33 CPC cylinder 34, 35 detector 40 control device 42 production control device

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B21C 47/34 B21C 47/34 D B23K 11/04 102 B23K 11/04 102 G05D 3/12 301 G05D 3 / 12 301Z

Claims (4)

[Claims] 1. A position moving device capable of moving a position of a metal band in a width direction is installed on a path for continuously passing a metal band, and a shift in a width direction of a metal plate passing position is detected. Then, in the method for controlling the position of a metal strip passing through a metal strip to give an operation command value to the position moving device so as to reduce the deviation, when the detected deviation is larger than a predetermined deviation reference value, A step control for intermittently giving an operation command value to a predetermined time interval and providing the intermittent operation value to a metal strip passing position. 2. The metal strip is sequentially fed from a plurality of coils, and a tail end of a metal strip fed from a preceding coil and a tip of a metal strip fed from a subsequent coil are joined by welding. 2. The metal strip passing position control according to claim 1, wherein the step control is performed when a change in the sheet width at the welded portion is larger than a predetermined width reference value. Method. 3. The method according to claim 1, wherein when the material of the metal band is a predetermined soft material, the moving range of the position moving device is limited. 4. The method according to claim 1, wherein the shift in the width direction of the passing position of the metal strip is a shift between the center line in the width direction of the metal strip and the center line of the passing path. 5. The method for controlling a threading position of a metal strip according to any one of the above.