JP2004154799A - Apparatus, method and computer program for restraining meandering of strip on temper rolling line and computer-readable recording medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To restrain such large meandering that defective threading arises while satisfying characteristics required in a temper rolling stage as much as possible when performing temper rolling of a finish-rolled strip. <P>SOLUTION: When the current value 34 of difference between gap length on the operation side between a first and a second work rolls 8a, 8b and gap length on the drive side does not fall in tolerance 35 which is set on the basis of load difference obtained with a operation side load cell 7a and a drive-side load cell 7b, by keeping the gap length as the current value, control for restraining the meandering of the strip can be started just before the strip is moved in such a degree that proper performance of the temper rolling is hindered, and thus such large meandering that the defective threading arises is restrained while satisfying the characteristics required in the temper rolling stage as much as possible. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an apparatus, a method, a computer program, and a computer-readable recording medium for suppressing strip meandering in a temper rolling line, and is particularly suitable for use in suppressing the meandering of a strip being temper-rolled. It is something.
[0002]
[Prior art]
In the field of the steel industry, it is common practice to temper-roll finish-rolled strips to improve the quality. In this temper rolling, the strip that has been finish-rolled is passed between upper and lower work rolls provided in a rolling mill, and the strip is reduced with a light pressure of about 1 to 3%. Is what you do.
[0003]
In the general hot rolling, the gap length between the upper and lower work rolls is adjusted so that the hydraulic pressure of the operating hydraulic pressure reduction cylinder and the hydraulic pressure of the driving hydraulic pressure reduction cylinder each become a predetermined target value. Thus, substantially uniform reduction is performed on the entire finish-rolled strip.
[0004]
However, when such control is adopted in the above-mentioned temper rolling, when the meandering of the strip occurs, there is a problem that the gap length between the upper and lower work rolls is adjusted so that the meandering of the strip increases. there were.
[0005]
For example, when the strip during temper rolling is meandering to the operation side, the oil pressure of the operation side hydraulic pressure reduction cylinder increases and the oil pressure of the drive side hydraulic pressure reduction cylinder decreases.
[0006]
Therefore, in such a case, the hydraulic pressure of the operating-side hydraulic pressure-reducing cylinder is reduced in order to set the hydraulic pressure of the operating-side hydraulic pressure-reducing cylinder and the hydraulic pressure of the driving-side hydraulic pressure-reducing cylinder to the predetermined target values. Thus, the hydraulic pressure of the drive side hydraulic pressure reduction cylinder is increased.
[0007]
Thereby, the gap length on the operation side between the upper and lower work rolls is opened, and the gap length on the drive side is closed, so that the strip during temper rolling that has meandered to the operation side is further meandered to the operation side. Will be.
[0008]
In this way, if the strip undergoing the temper rolling is meandering, there is a possibility that a material passing defect may occur. For this reason, when it is desired to suppress the strip from meandering, it is conceivable to use a meandering control technique described in Patent Document 1 or the like.
[0009]
In the meandering control technology described in Patent Document 1, a difference between the tension applied to the operation side of the strip at the rolling mill entry side and the tension applied to the drive side is detected, and the load applied to the operation side of the rolling mill is detected. The difference between the load applied to the driving side is detected, and from the detected difference in tension and the difference in load, the necessary and optimum rolling position leveling amount required to suppress the strip meandering is obtained, and the obtained rolling position leveling amount is obtained. Thus, the rolling position of the rolling mill is controlled.
[0010]
[Patent Document 1]
Japanese Patent No. 2672700
[0011]
[Problems to be solved by the invention]
However, if the strip is prevented from meandering by the conventional meandering control technique described above in the temper rolling step, a uniform reduction cannot be applied to the finish-rolled strip, and the temper rolling step is performed. There has been a problem that the required characteristics may not be provided to the strip.
[0012]
The present invention has been made in view of the above-described problems, and when temper-rolling a strip that has been subjected to finish rolling, while satisfying as much as possible the characteristics required in the temper rolling step, poor material passing. It is an object of the present invention to be able to suppress large meandering that causes the occurrence of a wobble.
[0013]
[Means for Solving the Problems]
The meandering suppression device of the strip in the temper rolling line of the present invention, in the temper rolling line in which the finish-rolled strip is passed between upper and lower work rolls via a clipping roll to perform temper rolling. A meandering suppression device for a strip, wherein the difference between the gap length on the operation side between the upper and lower work rolls and the gap length on the drive side is a load applied to the operation side of the clipping roll and a load applied to the drive side. When it is determined that the deviation is out of the predetermined allowable range set based on the difference between the above and below the upper and lower temper rolling control for temper rolling of the strip under the conditions required in the temper rolling step. The meandering suppression control for maintaining the gap length between the work rolls at the current value is performed.
[0014]
The strip method in the temper rolling line of the present invention is a method of forming a strip in a temper rolling line in which a finish-rolled strip is passed between upper and lower work rolls through a clipping roll and temper-rolled. In the meandering suppressing method, the difference between the gap length on the operation side between the upper and lower work rolls and the gap length on the drive side is the difference between the load applied to the operation side of the clipping roll and the load applied to the drive side. When it is determined that it deviates from the predetermined allowable range set based on the upper and lower work rolls, in preference to the temper rolling control for temper rolling the strip under the conditions required in the temper rolling step. It is characterized in that meandering suppression control for maintaining the gap length between them as the current value is performed.
[0015]
The computer program of the present invention, when the finish-rolled strip is passed between the upper and lower work rolls through a clipping roll and temper rolling, the gap length on the operation side between the upper and lower work rolls, When it is determined that the difference between the gap length on the drive side and the load on the operation side of the clipping roll and the load on the drive side deviate from a predetermined allowable range set based on a difference between the load on the drive side, the temper rolling step In preference to the temper rolling control for temper rolling of the strip under the conditions required in that the meandering suppression control to keep the gap length between the upper and lower work rolls at the current value is performed. It is characterized by being executed by a computer.
[0016]
The computer-readable recording medium of the present invention is characterized in that the finish-rolled strip is passed between upper and lower work rolls via a clipping roll and temper-rolled, on the operation side between the upper and lower work rolls. When it is determined that the difference between the gap length and the gap length on the drive side is out of a predetermined allowable range set based on the difference between the load on the operation side of the clipping roll and the load on the drive side, Prioritizing the temper rolling control for temper rolling the strip under the conditions required in the temper rolling step, meandering suppression control for maintaining the gap length between the upper and lower work rolls at the current value is performed. A computer program is recorded.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
(First Embodiment)
Next, a first embodiment of an apparatus, a method, a computer program, and a computer-readable recording medium for strip meandering in a temper rolling line of the present invention will be described with reference to the drawings.
[0018]
FIG. 1 shows the first embodiment of the present invention and is a diagram showing an example of a schematic configuration of a temper rolling facility. FIG. 2 is a diagram showing an example of a schematic configuration of a temper rolling mill of the temper rolling equipment shown in FIG.
[0019]
In FIG. 1, the temper rolling equipment 1 includes a payoff reel 2, an entrance shear 3, a welding machine 4, an entrance bridle roll 5, an entrance clipping roll 6, a load cell 7, and a temper mill 8. , A delivery clipping roll 9, a delivery bridle roll 10, a delivery shear 11, a tension reel 12, a speed control device 13, and a meandering suppression device 14.
[0020]
A strip coil 15 finished and rolled by, for example, a hot rolling line is wound around the payoff reel 2. Then, the strip coil 15 wound around the payoff reel 2 is rewound from the leading end and is conveyed to the entrance shear 3.
[0021]
The entry shear 3 is for performing processing such as cutting the strip unwound from the payoff reel 2, and for performing temper rolling continuously.
[0022]
The welding machine 4 is for welding and integrating the succeeding strip conveyed from the entrance shear 3 with the preceding strip, so that the temper rolling can be performed continuously. belongs to.
[0023]
The entrance-side bridle roll 5 is a roll that is disposed on a transport path following the welding machine 4 and applies tension to the strip.
The entry side clipping roll 6 is a roll for stabilizing the tension applied to the strip conveyed from the entry side bridle roll 5.
[0024]
The load cell 7 has an operation-side load cell 7a disposed on the lower surface of the input side clipping roll 6 on the operation side, and a drive-side load cell 7b disposed on the lower surface of the input side clipping roll 6 on the drive side. The load on the operating side and the load on the driving side of the entry side clipping roll 6 are measured to acquire information on the load.
[0025]
The temper rolling mill 8 temper-rolls the strip conveyed from the entry side clipping roll 6.
Here, the configuration of the temper rolling mill 8 of the present embodiment will be described with reference to FIG.
In FIG. 2, the temper rolling mill 8 includes a first work roll 8a, a second work roll 8b, a first backup roll 8c, a second backup roll 8d, and an operation side hydraulic pressure reduction device 8e. , A drive-side hydraulic pressure reduction device 8f.
[0026]
The first work roll 8a and the second work roll 8b are disposed at a predetermined interval, and the entrance side clipping roll 6 is disposed between the first work roll 8a and the second work roll 8b. It is configured such that the strip conveyed from is passed through.
[0027]
In the present embodiment, the strip conveyed from the entry side clipping roll 6 is passed between the first work roll 8a and the second work roll 8b from obliquely above, The tension applied to the strip during temper rolling is stabilized.
[0028]
The first backup roll 8c and the second backup roll 8d are configured to support the first work roll 8a and the second work roll 8b, respectively.
[0029]
The operation side hydraulic pressure reduction device (operation side hydraulic pressure reduction cylinder) 8e and the drive side hydraulic pressure reduction device (drive side hydraulic pressure reduction cylinder) 8f are provided on the operation side and the drive side of the second backup roll 8d, respectively. Then, the gap length on the operation side and the gap length on the drive side between the first work roll 8a and the second work roll 8b are determined by the operation side hydraulic pressure reduction cylinder 8e and the drive side hydraulic pressure reduction cylinder 8f. It is adjusted to a predetermined value.
[0030]
Returning to FIG. 1, the exit side clipping roll 9 is a roll provided to stabilize the tension of the strip temper-rolled by the temper rolling mill 8. In the present embodiment, the strip subjected to the temper rolling by the temper rolling mill 8 is conveyed obliquely upward by the action of the output side clipping roll 9 so that the tension applied to the strip during the temper rolling is achieved. Is trying to stabilize.
[0031]
The exit-side bridle roll 10 is a roll that is disposed on the transport path following the exit-side clipping roll 9 and applies tension to the temper-rolled strip.
[0032]
The delivery shear 11 is for cutting a preceding strip (strip coil 16) wound by the tension reel 12 and a strip going after passing through the delivery bridle roll 10.
[0033]
The speed control device 13 adjusts the rotation speed of the plurality of transport rollers provided in the temper rolling equipment 1 of the present embodiment to set the transport speed (the passing speed) of the strip to be temper rolled to a predetermined value. The purpose of this is to make it possible to perform good temper rolling at a controlled speed.
[0034]
The meandering suppressing device 14 performs an operation-side hydraulic pressure reduction so as to reduce the strip to be temper-rolled by the temper rolling mill 8 as uniformly as possible and to suppress the strip from meandering as much as possible. This is for controlling the hydraulic pressure of the cylinder 8e and the hydraulic pressure of the drive-side hydraulic pressure lowering cylinder 8f to predetermined values.
[0035]
Here, the configuration and function of the meandering suppressing device 14 of the present embodiment will be described with reference to FIGS. 2 and 3.
As shown in FIG. 2, the meandering suppression device 14 of the present embodiment includes a load difference calculation unit 21, a gap difference target value calculation unit 22, an allowable range setting unit 23, a gap difference calculation unit 24, a determination unit 25 and a cylinder adjusting means 26.
[0036]
The load difference calculating means 21 calculates the difference between the load applied to the operation-side load cell 7a and the load applied to the drive-side load cell 7b from the information on the loads acquired by the operation-side load cell 7a and the drive-side load cell 7b (see the time chart in FIG. 3). Has a function of calculating the load cell load difference 33).
[0037]
Based on the load cell load difference 33 calculated by the load difference calculation means 21, the gap difference target value calculation means 22 calculates the gap length and drive between the first work roll 8 a and the second work roll 8 b on the operation side. It has the function of calculating the target value of the difference from the gap length on the side (target value 35a in FIG. 3).
[0038]
The target value 35a is a gap difference required for moving the strip, which is being passed between the first work roll 8a and the second work roll 8b and undergoing temper rolling, to the center.
[0039]
The allowable range setting means 23 has a function of setting a predetermined allowable range (the allowable range 35 in FIG. 3) with the target value 35a calculated by the gap difference target value calculating means 22 as a center value. The allowable range 35 is determined by the material of the strip to be temper rolled.
[0040]
The gap difference calculation means 24 calculates the first work roll 8a and the second work roll 8b from the information on the oil column position of the operation side hydraulic pressure reduction cylinder 8e and the information on the oil column position of the drive side hydraulic pressure reduction cylinder 8f. Of the gap length on the operation side and the gap length on the drive side during the period of time, and calculates the difference between the calculated gap length on the operation side and the gap length on the drive side (the current value 34 of the gap difference in FIG. 3). have.
[0041]
The determining means 25 has a function of determining whether or not the current value 34 of the gap difference calculated by the gap difference calculating means 24 falls within the allowable range 35 set by the allowable range setting means 23.
[0042]
The cylinder adjusting means 26 has a function of adjusting the hydraulic pressure of the operating-side hydraulic pressure-reducing cylinder 8e and the hydraulic pressure of the drive-side hydraulic pressure-reducing cylinder 8f based on the result determined by the determining means 25.
[0043]
The function performed by the cylinder adjusting unit 26 will be specifically described. First, when the determining unit 25 determines that the current value 34 of the gap difference falls within the allowable range 35, the cylinder adjusting unit 26 sets The first hydraulic pressure adjustment signal OS1 is output to the pressure reduction cylinder 8e and the drive side hydraulic pressure reduction cylinder 8f.
[0044]
This first hydraulic pressure adjustment signal OS1 is set so that the sum of the hydraulic pressure of the operation side hydraulic pressure reduction cylinder 8e and the hydraulic pressure of the drive side hydraulic pressure reduction cylinder 8f becomes the first target value. This is a signal for adjusting the oil pressure.
[0045]
Thus, the operation side hydraulic pressure reduction cylinder 8e and the drive side hydraulic pressure reduction cylinder 8f are individually controlled at a constant pressure, and the strip can be subjected to the temper rolling under the conditions required in the temper rolling step.
[0046]
In the example shown in FIG. 3, the hydraulic pressure of the operating-side hydraulic pressure-reducing cylinder 8e and the hydraulic pressure of the driving-side hydraulic pressure-reducing cylinder 8f become the first hydraulic pressure value 31 and the second hydraulic pressure value 32, respectively. The sum of the hydraulic pressures of the hydraulic pressure lowering cylinders 8e and 8f is set to the first target value.
[0047]
Further, the constant pressure control is performed in a section A in which the current value 34 of the gap difference matches the target value 35a and in a section B in which the current value 34 of the gap difference falls within the predetermined allowable range 35.
[0048]
As described above, in the present embodiment, even when the current value 34 of the gap difference is not at the target value 35a, if the current value 34 is within the allowable range 35, the temper rolling can be appropriately performed. The strip is temper-rolled under the conditions required in the temper rolling step by performing constant pressure control.
[0049]
On the other hand, when the determination unit 25 determines that the current value 34 of the gap difference does not fall within the allowable range 35, the cylinder adjustment unit 26 applies the second hydraulic pressure to the operation-side hydraulic pressure reduction cylinder 8e and the drive-side hydraulic pressure reduction cylinder 8f. The adjustment signal OS2 is output, and the current value 34 of the gap difference is held (that is, the pressing positions of the first and second work rolls 8a and 8b are held at the current value).
[0050]
The second hydraulic pressure adjustment signal OS2 is such that the sum of the hydraulic pressure of the operation side hydraulic pressure reduction cylinder 8e and the hydraulic pressure of the drive side hydraulic pressure reduction cylinder 8f becomes a second target value different from the first target value. The signal for adjusting the hydraulic pressure of each hydraulic pressure lowering cylinder.
[0051]
As a result, the operation side hydraulic pressure reduction cylinder 8e and the drive side hydraulic pressure reduction cylinder 8f are individually controlled at a constant pressure, and the gap length between the first work roll 8a and the second work roll 8b on the operation side and the drive The gap length on the side (the position where the first and second work rolls 8a and 8b are lowered) can be maintained at the current value.
[0052]
In the example shown in FIG. 3, the hydraulic pressure of the operating-side hydraulic pressure-reducing cylinder 8 e and the hydraulic pressure of the drive-side hydraulic pressure-reducing cylinder 8 f are set to the third hydraulic pressure value 36 and the fourth hydraulic pressure value 37, respectively. The sum of the hydraulic pressures of the hydraulic pressure lowering cylinders 8e and 8f is set to the second target value. In the present embodiment, the constant pressure control is performed in the section C where it is determined that the current value 34 of the gap difference does not fall within the predetermined allowable range 35.
[0053]
Next, a specific operation of the meandering suppressing device 14 will be described with reference to a flowchart of FIG.
[0054]
First, in the first step S1, the load difference calculation means 21 waits until information on a load is input from the operation-side load cell 7a and the drive-side load cell 7b, and proceeds to step S2 when input.
[0055]
Then, in step S2, the load difference calculating means 21 calculates the difference between the load measured by the operation-side load cell 7a and the load measured by the drive-side load cell 7b (the load cell load) from the information on the load input in step S1. The difference 33) is calculated.
[0056]
Next, in step S3, based on the load cell load difference 33 calculated in step S2, the gap difference target value calculating unit 22 determines whether the operation between the first work roll 8a and the second work roll 8b is performed. The target value 35a of the difference between the gap length and the gap length on the drive side is calculated.
[0057]
Next, in step S4, the allowable range setting unit 23 sets a predetermined allowable range 35 (the upper limit 35b and the lower limit 35c of the allowable range 35) around the target value 35a calculated in step S3.
[0058]
Next, in step S5, the gap difference calculation means 24 waits until information regarding the position of the oil column of each of the hydraulic pressure reduction cylinders 8e and 8f is input. When the information is input, the process proceeds to step S6.
[0059]
Then, in step S6, the gap difference calculating means 24 determines whether the first work roll 8a and the second work roll 8b are based on the information on the oil column positions of the hydraulic pressure reduction cylinders 8e and 8f input in step S5. Is calculated as the current value 34 of the difference between the gap length on the operation side and the gap length on the drive side.
[0060]
Next, in step S7, the determination unit 25 determines whether the current value 34 of the gap difference calculated in step S6 falls within the allowable range 35 set in step S4, and determines that the current value 34 does. , The temper rolling can be appropriately performed, and the process proceeds to step S8.
[0061]
Then, in step S8, the cylinder adjusting unit 26 outputs the first hydraulic pressure adjustment signal OS1 to the operation side hydraulic pressure lowering cylinder 8e and the drive side hydraulic pressure lowering cylinder 8f. Thereby, the hydraulic pressure of the operation side hydraulic pressure reduction cylinder 8e is controlled to be the first hydraulic pressure value, and the hydraulic pressure of the drive side hydraulic pressure reduction cylinder 8f is controlled to be the second hydraulic pressure value. The strip is subjected to a substantially constant reduction, and the strip can be temper-rolled under the conditions required in the temper rolling step.
[0062]
On the other hand, as a result of the determination in step S7, it is determined that the current value 34 of the gap difference calculated in step S6 does not fall within the allowable range 35 set in step S4, and a sign that the strip is meandering greatly is detected. Proceeds to step S9.
[0063]
In step S9, the cylinder adjusting means 26 outputs the second hydraulic pressure adjustment signal OS2 to the operation side hydraulic pressure lowering cylinder 8e and the drive side hydraulic pressure lowering cylinder 8f. As a result, the hydraulic pressure of the operating-side hydraulic pressure-reducing cylinder 8e is controlled to have the third hydraulic value, and the hydraulic pressure of the drive-side hydraulic pressure-reducing cylinder 8f is controlled to have the fourth hydraulic value. The gap length on the operation side between the work roll 8a and the second work roll 8b and the gap length on the drive side are maintained at the current values.
[0064]
Then, after performing the process of step S8 or step S9, the process proceeds to step S10, and it is determined whether or not the temper rolling of the strip has been completed. If the result of this determination is that temper rolling has not been completed, the process returns to step S1, and the processes from step S1 to step S10 are repeated until the temper rolling is completed.
[0065]
The determination as to whether or not the temper rolling of the strip has been completed may be made, for example, by determining whether or not the loads input from the operation-side load cell 7a and the drive-side load cell 7b have become zero. Good.
[0066]
The control operation by the meandering suppressing device 14 described above can be realized by using a computer system as shown in FIG.
FIG. 5 is a block diagram illustrating an example of a configuration of a computer system provided in the meandering suppressing device 14.
In FIG. 5, a computer system 50 includes a CPU 51, a ROM 52, a RAM 53, a keyboard controller (KBC) 55 of a keyboard (KB) 54, a CRT controller (CRTC) 57 of a CRT display (CRT) 56 as a display unit, and the like. A disk controller (DKC) 60 of a hard disk (HD) 58 and a flexible disk (FD) 59 and a network interface controller (NIC) 62 for connection to a network 61 can communicate with each other via a system bus 63. It has a connected configuration.
[0067]
The CPU 51 comprehensively controls each component connected to the system bus 53 by executing software stored in the ROM 52 or the HD 58 or software supplied from the FD 29.
That is, the CPU 51 reads out a processing program according to a predetermined processing sequence from the ROM 52, the HD 58, or the FD 59 and executes the processing program, thereby performing control for realizing an operation described later.
[0068]
The RAM 53 functions as a main memory or a work area of the CPU 51.
The KBC 55 controls an instruction input from the KB 54 or a pointing device (not shown).
[0069]
The CRTC 57 controls display on the CRT 56.
The DKC 60 controls access to the HD 58 and the FD 59 that store a boot program, various applications, an edit file, a user file, a network management program, and a predetermined processing program in the present embodiment.
The NIC 52 bidirectionally exchanges data with a device or a system on the network 61.
[0070]
As described above, in the present embodiment, when the current value 34 of the difference between the gap length on the operation side and the gap length on the drive side between the first and second work rolls 8a and 8b falls within the allowable range 35. Since the strip is temper-rolled under the conditions required in the temper rolling step, the strip being temper-rolled is passed through the center of the first and second work rolls 8a and 8b. Even if it is not performed, when there is no problem in performing the temper rolling appropriately, it is possible to perform a substantially constant reduction on the strip.
[0071]
If the current value 34 of the difference between the gap length on the operation side and the gap length on the drive side between the first and second work rolls 8a and 8b does not fall within the allowable range 35, the first and the second Since the gap length on the operation side and the gap length on the drive side between the second work rolls 8a and 8b are maintained at the current values, the temper rolling is performed so as to hinder proper execution of the temper rolling. Immediately before the strip moves greatly, control for suppressing the meandering of the strip during the temper rolling can be started.
[0072]
Therefore, meandering of the strip can be suppressed while satisfying the characteristics required in the temper rolling step as much as possible. As a result, it is possible to realize both the property required in the temper rolling step as much as possible and the suppression of large meandering that may cause defective material passing.
[0073]
From the above, it is possible to make the shape and the reduction ratio of the entire strip that has been continuously temper-rolled as uniform as possible, and to improve the reproducibility of the strip that has been temper-rolled.
[0074]
In addition, by providing the entrance side clipping roll 6 and the exit side clipping roll 7, the conveyed strip is lifted before and after the temper rolling mill 8, so that the tension applied to the strip during temper rolling is reduced. Stabilization can be ensured. Therefore, the strip can be temper-rolled in a state in which the influence of the shape of the strip before the temper rolling is removed as much as possible.
[0075]
Further, when the current value 34 of the difference between the gap length on the operation side between the first and second work rolls 8a and 8b and the gap length on the drive side does not fall within the allowable range 35, the hydraulic pressure on the operation side By changing the target value of the hydraulic pressure of the screw-down cylinder 8e and the target value of the hydraulic pressure of the drive-side hydraulic pressure-reducing cylinder 8f, the gap length between the first and second work rolls 8a and 8b on the operation side and the drive side Since the gap length is maintained at the current value, it is possible to perform uniform reduction on the strip during temper rolling while controlling to suppress the meandering of the strip during temper rolling. Therefore, even when the control for suppressing the meandering is being performed, the characteristics required in the temper rolling step can be given to the strip.
[0076]
In the present embodiment, the entrance side clipping roll 6 and the exit side clipping roll 7 are provided so as to reliably stabilize the tension applied to the strip during the temper rolling. In the case where the tension applied to the strip during temper rolling can be stabilized by only the clipping roll 6, a configuration in which the output side clipping roll 7 is not provided may be adopted.
[0077]
(Second embodiment)
Next, a second embodiment of the present invention will be described. The meandering suppression device of the present embodiment differs from the meandering suppression device 14 of the above-described first embodiment only in part of the control operation. The same reference numerals as in FIGS. 1 to 5 denote the same parts, and a detailed description thereof will be omitted.
[0078]
As described above, in the first embodiment, when the gap length on the operation side between the first and second work rolls 8a and 8b and the gap length on the drive side are maintained at the current values, the operation is performed. The target values of the hydraulic pressure of the side hydraulic pressure lowering cylinder 8e and the hydraulic pressure of the driving side hydraulic pressure lowering cylinder 8f are changed (step S9 in FIG. 4).
[0079]
On the other hand, in the present embodiment, the first and second positions are controlled by holding the oil column position of the operating side hydraulic pressure lowering cylinder 8e and the oil column position of the driving side hydraulic pressure lowering cylinder 8f. The gap length on the operation side between the work rolls 8a and 8b and the gap length on the drive side are kept at the current values.
[0080]
As described above, in the present embodiment, in step S7 of FIG. 4, the current value 34 of the difference between the gap length on the operation side between the first and second work rolls 8a and 8b and the gap length on the drive side is determined. If it is determined that the distance does not fall within the allowable range 35 set in step S4, the above-described fixed position control is performed to reduce the gap length on the operation side between the first and second work rolls 8a and 8b. , The gap length on the drive side is maintained at the current value. For example, the operating condition is such that the meandering of the strip cannot be suppressed by the method of the above-described first embodiment. However, meandering of the strip can be reliably prevented.
[0081]
(Another embodiment of the present invention)
In order to operate various devices in order to realize the functions of the above-described embodiments, software programs for realizing the functions of the above-described embodiments are provided to an apparatus or a computer in a system connected to the various devices. The present invention also includes those which are supplied and executed by operating the above-described various devices according to a program stored in a computer (CPU or MPU) of the system or the apparatus.
[0082]
In this case, the program code itself of the software realizes the functions of the above-described embodiment, and the program code itself and a unit for supplying the program code to the computer, for example, storing the program code The recorded recording medium constitutes the present invention. As a recording medium for recording such a program code, for example, a flexible disk, a hard disk, an optical disk, a magneto-optical disk, a CD-ROM, a magnetic tape, a nonvolatile memory card, a ROM, and the like can be used.
[0083]
When the computer executes the supplied program code, not only the functions of the above-described embodiments are realized, but also the OS (operating system) or other application software running on the computer. Such a program code is also included in an embodiment of the present invention when the functions of the above-described embodiment are implemented in cooperation with the above.
[0084]
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, a CPU provided in the function expansion board or the function expansion unit based on the instruction of the program code. The present invention also includes a case where the functions of the above-described embodiments are implemented by performing part or all of actual processing.
[0085]
【The invention's effect】
As described above, according to the present invention, when the finish-rolled strip is passed between upper and lower work rolls via a clipping roll and temper-rolled, a gap on the operation side between the upper and lower work rolls is provided. When it is determined that the difference between the length and the gap length on the drive side deviates from a predetermined allowable range set based on the difference between the load on the operation side of the clipping roll and the load on the drive side, In order to perform meandering suppression control for maintaining the gap length between the upper and lower work rolls at the current value in preference to the temper rolling control for temper rolling the strip under the conditions required in the temper rolling step. Therefore, it is possible to start the control to suppress the meandering of the strip immediately before the strip moves large enough to hinder proper temper rolling. It made. Therefore, meandering of the strip can be suppressed while satisfying the characteristics required in the temper rolling step as much as possible. As a result, it is possible to realize both the property required in the temper rolling step as much as possible and the suppression of large meandering that may cause defective material passing.
[Brief description of the drawings]
FIG. 1 is a view showing an embodiment of the present invention and showing an example of a schematic configuration of a temper rolling facility.
FIG. 2 shows an embodiment of the present invention and is a diagram showing an example of a schematic configuration of a temper rolling mill of a temper rolling facility.
FIG. 3 is a time chart illustrating the control operation of the meandering suppressing device according to the embodiment of the present invention.
FIG. 4 is a flowchart illustrating a control operation of the meandering suppressing device according to the embodiment of the present invention.
FIG. 5 is a block diagram illustrating the embodiment of the present invention and illustrating an example of a configuration of a computer system included in the meandering suppressing device.
[Explanation of symbols]
1 Temper rolling equipment
6 entry side clipping roll
7 Load cell
8 Temper rolling mill
8a First work roll
8b Second work roll
8e Hydraulic pressure reduction cylinder on operation side
8f Drive side hydraulic pressure reduction cylinder
9 Outgoing clipping roll
14 Meandering control device

Claims (8)

Finished rolled strip, a meandering suppression device of the strip in the temper rolling line so as to pass between the upper and lower work rolls through the clipping roll and pass temper rolling,
The difference between the gap length on the operation side between the upper and lower work rolls and the gap length on the drive side is a predetermined value set based on the difference between the load applied to the operation side of the clipping roll and the load applied to the drive side. When it is determined that the gap is out of the allowable range, the gap length between the upper and lower work rolls is set to the current value in preference to the temper rolling control for temper rolling the strip under the conditions required in the temper rolling step. A meandering suppression device for a strip in a temper rolling line, wherein a meandering suppression control for maintaining the state is maintained. The gap length between the upper and lower work rolls is maintained at the current value by setting the hydraulic pressure of the operating side and drive side hydraulic reduction cylinders for adjusting the reduction of the upper and lower work rolls to a predetermined target value. The meandering suppressing device for a strip in a temper rolling line according to claim 1, wherein: The gap length between the upper and lower work rolls is maintained at the current value by controlling the positions of the oil columns of the operation side and drive side hydraulic pressure reduction cylinders for adjusting the reduction of the upper and lower work rolls to be constant. The meandering suppressing device for a strip in a temper rolling line according to claim 1, wherein Finished rolled strip, a meandering suppression method of the strip in a temper rolling line so as to pass and pass between the upper and lower work rolls through a clipping roll and temper rolling,
The difference between the gap length on the operation side between the upper and lower work rolls and the gap length on the drive side is a predetermined value set based on the difference between the load applied to the operation side of the clipping roll and the load applied to the drive side. When it is determined that the gap is out of the allowable range, the gap length between the upper and lower work rolls is set to the current value in preference to the temper rolling control for temper rolling the strip under the conditions required in the temper rolling step. A meandering suppression method for a strip in a temper rolling line, wherein a meandering suppression control for maintaining the state is performed. The gap length between the upper and lower work rolls is maintained at the current value by controlling the hydraulic pressure of the operating side and drive side hydraulic reduction cylinders for adjusting the reduction of the upper and lower work rolls to a predetermined target value. The method for suppressing meandering of a strip in a temper rolling line according to claim 4, wherein: The gap length between the upper and lower work rolls is maintained at the current value by controlling the positions of the oil columns of the operation side and drive side hydraulic pressure reduction cylinders for adjusting the reduction of the upper and lower work rolls to be constant. The method for suppressing meandering of a strip in a temper rolling line according to claim 4, characterized in that: When the finish-rolled strip is passed between the upper and lower work rolls via a clipping roll and temper-rolled,
The difference between the gap length on the operation side between the upper and lower work rolls and the gap length on the drive side is a predetermined value set based on the difference between the load applied to the operation side of the clipping roll and the load applied to the drive side. When it is determined that the gap is out of the allowable range, the gap length between the upper and lower work rolls is set to the current value in preference to the temper rolling control for temper rolling the strip under the conditions required in the temper rolling step. A computer program for causing a computer to perform meandering suppression control for keeping the state as it is. When the finish-rolled strip is passed between the upper and lower work rolls via a clipping roll and temper-rolled,
The difference between the gap length on the operation side between the upper and lower work rolls and the gap length on the drive side is a predetermined value set based on the difference between the load applied to the operation side of the clipping roll and the load applied to the drive side. When it is determined that the gap is out of the allowable range, the gap length between the upper and lower work rolls is set to the current value in preference to the temper rolling control for temper rolling the strip under the conditions required in the temper rolling step. A computer-readable recording medium on which is recorded a computer program for performing meandering suppression control for maintaining the same.

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