JPH07284835A - Device and method for correcting meandering - Google Patents

Abstract

PURPOSE:To provide a device and a method for correcting the meandering with small installation space. CONSTITUTION:In a meandering correcting device, a restricting device 4 provided with restricting rollers 4-1 or pinch rolls 4-5 which are arranged in a staggered manner are arranged between a guide device l of a displacement type and a meandering detector 2, and the restricting device 4 is arranged on a slide base 4-2 which follows the turning of the guide device 1 and is moved in the width direction of the strip. After the meandering correction of a displacement type is achieved, the strip on the outlet side of the guide device is restricted, and the strip is moved in the width direction according to the correction of the meandering.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and method for correcting meandering of a running strip in a strip processing line, and more particularly to a displacement type meandering correcting apparatus which can be installed in a small space.

[0002]

2. Description of the Related Art For strips such as thin steel strips, meandering due to unavoidable camber (bending of the strips) and defective shape, meandering at the joints of strips by welding, fluctuations in tension and roll alignment. Meandering occurs due to equipment-related factors such as misalignment. Such meandering hinders the normal passage of the strip, and when the meandering amount becomes large, it becomes impossible to pass the strip, or the yield is reduced when the strip is trimmed or the like.

Conventionally, as a meandering correcting device for a continuous strip processing line, there are steering type and displacement type meandering correcting devices.

FIG. 6 is a diagram showing a steering guide type meandering correction device, in which (a) is a plan view seen from above, and (b) is a plan view.
Is a front view. Reference numeral 9 is a guide roll, and 10 is a turning center.

When the guide roll 9 is swung about the swivel center 10 in the plane of the strip S advancing to the guide roll 9, the strip is centered by being laterally transferred and obliquely fed on the guide roll. It

The steering type meandering correction device is suitable for steady meandering correction because the strip is centered on the guide roll 9 that is turned, and is excellent in that the device is simple. However, since the advancing angle of the strip with respect to the guide roll changes, the strip laterally moves on the roll. This is a characteristic of the steering system, but since correction is delayed, it is difficult to improve the correction accuracy with respect to rapid meandering that occurs near the welding point. For this reason, the steering type meandering correction device cannot be applied to a processing line such as a trimmer line that requires high meandering correction accuracy.

On the other hand, the displacement type meandering correction device is used at the entrance side of the trimmer line because of its quick response and excellent accuracy.

FIGS. 7 and 8 are views showing a displacement type meandering correction device, in which (a) is a view of the guide device from above and (b) is a front view of the device.
S is a strip, 1 is a guide device, 1-1, 1-2 are guide rolls, 1-3 are revolving frames, 1-4 are base frames,
1-5 is an actuator, 2 is a meandering detector, 3-1, 3-2 are fixed rolls.

A displacement type meandering correction device is a guide device 1 composed of one or two guide rolls, and a meandering detector 2 provided on the exit side of the guide device 1-2.
And the fixed rolls 3-1 and 3-2 provided on the inlet side and the outlet side. A guide device composed of two guide rolls generally has a structure shown in FIGS. 7 and 8.

In FIG. 7 and FIG. 8, the strip S entering the meandering correction device has guide rolls 1-1 and 1-2 supported by a swivel frame 1-3 in a U-shape or a Z-shape. It goes around and passes through the meandering detector 2. Guide roll 1-
1 and 1-2 are turning centers 1-6 by actuator 1-5
With respect to the base frame 1-4, the strip is laterally moved together with the swivel frame 1-3 in the direction of the arrow in the figure to correct the meandering.

FIG. 9 is a diagram showing the principle of meandering correction by a displacement guide type device. The strip S is traveling at a speed V in the direction of the arrow in the figure, and if a meandering (off center) of δ occurs on the entrance side of the device, the strip S is as shown in FIG.
The meandering detector 2 on the output side of the device shown in FIG. The swing frame 1-3 is swung by the actuator 1-5 so as to cancel the meandering, and the width center of the strip is returned to the center A of the process line. As shown by the solid line, the positions of the guide rolls 1-1 and 1-2 after turning are such that the line B connecting the widthwise centers of the guide rolls 1-1 and 1-2 coincides with the center line A of the process line. do not do. This does not fix the strip meandering on the guide roll,
This is because the guide roll is operated so that the meandering is erased on the output side of the device.

At this time, the relationship between the meandering amount δ and the turning angle θ is generally expressed by the following equation (1).

Δ = L × sin θ (1) where L is the turning radius and θ is the turning angle.

The displacement type meandering correction device is relatively excellent in meandering correction accuracy, but a device for further improving the meandering correction accuracy has been proposed.

The device disclosed in Japanese Patent Laid-Open No. 63-112358 is provided with two normal meandering correction devices, and the meandering correction device on the upstream side receives the position signal and the meandering signal of the meandering correction device on the downstream side. To operate. However, this is large as a facility, and in the above correction device in which a steering device that moves in the width direction with respect to the strip is combined, the lateral movement range of the steering device may be exceeded, and stable meandering correction is difficult.

The device disclosed in Japanese Patent Laid-Open No. 3-409 has a structure in which the guide roll on the entrance side is tilted, but the device and tilt control become complicated.

Japanese Utility Model Publication No. 5-4887 proposes a roller type side guide device in which a vertically arranged roller and a pinch roll are used to restrain the width of the strip to correct the meandering. However, the ability to correct a large meander is not sufficient, and if a large correction is made to increase the pressing force or the lateral pressing force is increased, the flatness or edge shape of the strip is impaired.

[0018]

In the trimmer line, since the centering accuracy of the strip is important, it is necessary to install a displacement type meandering correction device in the vicinity of the trimmer. However, in the displacement type meandering correction device, for example, the distance H between the rotating guide roll 1-2 and the fixed roll 3-2 shown in FIG.
To prevent deformation of the strip shearing (generated by lateral movement of the strip) and twisting (generated by tilting of the roll axis) that occur during meandering correction.

This distance H is 3 which is the maximum strip width.
Needed more than twice.

The installation of the displacement type meandering correction device requires a height space, and it is difficult to dispose the displacement correction device in the immediate vicinity of the trimmer. Also, the meandering of the strip is
Since detection is performed on the exit side of the guide device, when the distance between the detector and the trimmer becomes large, sufficient centering accuracy cannot be obtained due to the influence of the shape and bending of the strip.

An object of the present invention is to provide a meandering correction device and a meandering correction method which can improve the accuracy of meandering correction even in a small installation space.

[0022]

DISCLOSURE OF THE INVENTION The inventors of the present invention have conducted various studies on the distance between a rotating guide roll and a fixed roll of a displacement type meandering correction device and the positional relationship between a processing device arranged downstream and When the distance H between the rolls is shortened, it has been found that height fluctuations in the pass line and non-uniformity of strip tension distribution occur, which impairs the threading accuracy for the lower working process. completed.

The gist of the present invention resides in a meandering correction device shown in FIGS. 1 to 3 and a meandering correction method shown below.

Displacement type guide device
Between the (1) and the meandering detector (2), a restraint roller (4-1) or pinch rolls (4-5) arranged in a staggered manner is placed, and a restraint device (4) is placed. Device (4) is a guide device
A meandering correction device arranged on a slide base (4-2) that moves in the width direction of the strip (S) following the turning of (1).

After performing the displacement type meandering correction, the strip on the output side of the guide device is constrained and the strip is moved in the width direction according to the amount of the meandering correction.

[0026]

Operation: On the exit side of the guide device 1 shown in FIG. 7 or 8,
The phenomenon that occurs in the strip when equipment such as a trimmer is directly arranged without providing the fixed roll 3-2 will be described.

FIG. 10 is a diagram showing variations in the height of the strip pass line due to the turning of the guide device. From the figure, although the accuracy of the strip passing position is ensured, the turning of the guide roll 1-2 is performed. Thus, it can be seen that the height variation h of the pass line occurs in the strip.

FIG. 11 is a view showing the tension distribution generated in the strip obtained from the embodiment described later. From the figure, when the restraint device is not used (No. 2), the strip is formed by turning the guide roll. It can be seen that twisting deformation occurs and high tension is generated at both ends of the strip.

The height variation of the strip and the tension distribution in the width direction adversely affect the trimmer equipment, resulting in uneven wear of the rotary blade due to the difference in the biting angle, defective shape of the strip edge, and dislocation of the selvage. Therefore, in order to reduce the fluctuation of the pass line and the fluctuation of the tension distribution, a restraint device is arranged between the guide roll and the meandering detector so that it can move in the width direction of the strip following the rotation of the guide roll. did.

A meandering correcting device and a meandering correcting method of the present invention will be described with reference to the drawings.

FIG. 1 is a view showing a line in which the meandering correction device of the present invention is provided in front of a trimmer. (A) is a plan view seen from above, (b) is a front view, and (c) is a guide. The device is shown in (b) of Fig.
It is the figure seen from the -A direction. S is a strip, 1 is a guide device, 2 is a meandering detector, 4 is a restraint device, and 5 is a trimmer.

The strips S are guide rolls 1-1 and 1-2 installed in the displacement type guide device 1.
Circulates in a Z shape and enters the trimmer 5 via the restraint device 4. The restraint device 4 has restraint rollers 4-1 arranged in a zigzag pattern, and suppresses path fluctuation of the strip that has been corrected to meander. These restraining rollers 4-1 are installed in the housing 4-4 above the slide base 4-2, and are structured so that they can be moved in the width direction of the strip by an actuator 4-3. The meandering detector 2 is arranged on the exit side of the restraint device.

I. About meandering correction function: 1. When a restraint roller is used as the restraint device: If the meandering occurs due to the shape defect of the strip, the deviation in welding, and the poor angle at the upstream side of the line shown in Fig. 1, it propagates to the downstream side as the strip progresses, and the meandering is detected. The meandering amount is detected by the container 2. The guide device 1 is rotated by the actuator 1-5 so as to eliminate this meandering amount. When the guide roll 1-2 is turned to the left in FIG. 6 (c), the meandering is corrected and the strip center moves to the line center. However, since the strip is affected by the height variation accompanying the turning of the guide roll 1-2 and the twisting due to the inclination, the restraint device 4 is moved in the turning direction by the lateral movement amount of the turning angle, that is, the amount corresponding to the meandering amount δ. Move horizontally in the same direction as. As a result, the strip is not subjected to the force in the shearing direction between the guide roll 1-2 and the restraint device 4, and the occurrence of flatness failure can be prevented. Further, the tension distribution in the width direction generated on the strip is reduced and suppressed by the restraining roller of the restraining device.

2. When a pinch roll is used for the restraint device: FIG. 3 is a diagram showing a mode in which the pinch roll is used for the restraint device. A pinch roll 4-5 replaces the restraining roller shown in FIG. The meandering correction, path fluctuation, and tension distribution are basically the same as when using the restraining roller.

As for the strip, the guide rolls 1-1 and 1-2 installed in the displacement type guide device are Z-shaped.
A pinch roll 4-5 is arranged on the exit side so as to circulate in a letter shape and prevent the strip from varying. This pinch roll is installed on the slide base 4-2 and can be moved left and right by the actuator 4-3. The meandering detector 2 is arranged on the exit side of the pinch roll.

Here, the meandering correction function will be described. When the meandering occurs upstream due to the defective shape of the strip, the deviation due to welding, the defective angle, and the like, the meandering detector 2 detects the meandering and propagates it downstream. In order to eliminate this meandering amount, the displacement guide device 1 is swung by the amount represented by the above formula (1). The pinch roll on the exit side is laterally moved in the same direction as the turning direction by the amount of lateral movement of the turning angle, that is, the amount corresponding to the meandering amount δ. As a result, the strip is not deformed in the shearing direction between the guide roll 1-2 and the pinch roll 4-5, and it is possible to prevent the occurrence of flatness defects. Moreover, the influence of the tension distribution in the width direction is suppressed via the pinch rolls.

Even if a trimmer or the like is installed in the vicinity of the meandering correction device close to the meandering device to correct the meandering, good trimming can be performed without adverse effects of poor flatness and uneven tension distribution.

II. About interlocking the restraint device and the guide device: In FIGS. 1 and 3, a meandering detector is also installed on the exit side of the guide device 1, and the meandering correction is performed based on this meandering detector. In addition, it is possible to operate the restraint device 4 again based on the meandering detector 2 provided on the exit side of the restraint device 4.

1. When a restraint roller is used for the restraint device: In FIG. 1, when a strip meandering only on one side continuously enters the restraint device, a restraint roller that moves in the width direction with respect to the strip moves in the width direction of the strip. The movement cannot be fixed like a vertical roll. Therefore, if the restraint device is controlled independently and moved in the width direction with respect to the strip, if the meandering on the upstream side remains with the progress of the strip, the pass position of the roll of the restraint roller changes. The base must be moved, and a large slide base is required.

As described above, in the meandering correction method in which the correction roller (here, the restraining roller) is moved in the width direction with respect to the strip, the strip does not have the self-aligning action at the roller position, so the movement amount of the slide base is insufficient. To do.
Therefore, by interlocking the restraint device 4 and the guide device 1, the amount of meandering in the meandering detector 2 can be corrected in cooperation.

2. When a pinch roll is used as the restraint device: In FIG. 3, the pinch roll 4-5 and the guide roll 1
Linking -1, 1-2 is advantageous for the following reasons. A meandering detector is installed on the exit side of the guide roll 1-2,
After correcting the meandering based on this detector, again based on the output side detector 2 of the pinch roll 4-5, the pinch roll 4-5
It is also possible to activate. However, if the pinch roll that moves in the width direction relative to the strip is controlled independently, if the pinch roll narrows down, or if meandering that shifts to one side continuously occurs even if the pinch roll is not narrowed down, Therefore, the movement of the strip in the width direction cannot be fixed at the same position for a long time. For this reason, as the strip advances, the position of the pinch roll on the roll is changed, and it is necessary to further increase the movement amount of the slide base. In such a system in which the pinch roll is moved in the width direction with respect to the strip, the amount of movement of the slide base is insufficient because the pinch roll has no self-aligning action.

However, by interlocking the pinch roll and the guide roll, the amount of meandering at the meandering detector is corrected in cooperation with each other, and since the shortage is not corrected by the pinch roll independently, narrowing down by the pinch roll is performed. There will be no shortage of slide base movement.

Restraint roller 4-1 provided on the guide device output side
It may be possible to correct the strip meandering by restraining the plate edge with a vertical roll instead of the pinch roll 4-5 or the pinch roll 4-5, but this is not preferable because the shape of the strip edge is deteriorated.
Also, since the plate width always changes, it is necessary to always change the position of the vertical roll to correct the meandering at the end of the plate width.
Correction accuracy becomes unstable.

III. Method for interlocking the guide device and the restraint device: To interlock the swing of the guide device and the lateral movement of the restraint device, as shown in FIG. 1, the swivel frame 1-3 of the guide device and the restraint device are restrained. Displacement meters 6-1 and 6-2 are arranged on the slide base 4-2 of the device 4, respectively, and the restraint device 4 is provided by the output of the displacement meter 6-1 arranged on the swivel frame 1-3 of the guide device.
The actuator 4-3 is operated to control the position of the slide base 4-2.

Next, the control of meandering correction will be described.

FIG. 4 is a diagram for explaining a control method for correcting the meandering. When the meandering detector 2 (see FIG. 1) detects the meandering of the strip, the displacement guide device 1 is operated via the controller. The actuator 1-5 arranged at is driven to rotate the guide device. As a result, the strip passing position changes, and the amount of change is fed back to the meandering detector 2 to correct the meandering. In the present invention, the turning amount of the guide device is measured by the displacement meter 6-1 and the slide base actuator 4-3 is driven from the measured value via the controller. Further, the amount of movement of the slide base is fed back to the controller via the displacement gauge 6-2 of the slide base, so that the amount of movement of the slide base follows the turning amount of the guide device.

FIG. 2 is a view showing a meandering correction device for mechanically connecting and operating a guide device and a restraint device.
FIG. 3B is a view of the guide device as seen from the direction AA of FIG. 2B, and FIG. The swing frame 1-3 of the guide device and the slide base 4-2 of the restraint device 4 are mechanically connected by the connecting culvert 7, and the swing frame 1-3 of the guide device is connected by the actuator 8.
At the same time as turning, the restraint device 4 is moved laterally.

FIG. 5 is a diagram for explaining another control method of meandering correction. As shown in FIG. 2, the guide device and the slide base are set based on the detection value of the meandering detector 2. The same amount of driving is performed, and the error generated in each moving amount is corrected by the measurement value of the displacement meter. Since the change in the strip passing position is fed back to the meandering detector, the actuator is driven until the meandering correction is completed.

Although there are other control methods, the object of the present invention is to make the slide base and the guide device have the same lateral operation amount.

[0050]

EXAMPLES The present invention will be described in more detail by way of examples.

(Example 1) As shown in FIG. 1, a meandering correction device was placed in front of a trimmer device to perform meandering correction and side trim of a strip.

In the guide device, two guide rolls having a diameter of 1400 mm and a length of 2000 mm are arranged on a revolving frame with a center-to-center distance of 1500 mm, and the revolving frame can rotate at an angle of ± 5 °. Restraint is 100 mm in diameter, length
The four 2000 mm restraint rollers are arranged in a staggered pattern, the second and fourth rollers from the entrance side of the strip can move up and down 20 mm, and the slide base can move ± 300 mm laterally. The meandering detector uses an optical width sensor,
It was installed in front of the trimmer.

The strips used in the test were hot-rolled steel sheets, and were subjected to meandering correction and side trim under the conditions shown in Table 1,
The amount of meandering and the amount of side trim were measured and shown in Table 1.

[0054]

[Table 1]

In Test No. 1, since the guide device of the meandering correction device was not swung and the plate was passed with the restraint device released, the meandering amount was as large as 35 mm and 73 mm, and the trim margin was 50 mm.
However, the ear line was dislocated.

In No. 2, since only the guide device of the meandering correction device was turned, the meandering amount was reduced to 2.2 mm and 4.3 mm, the trim allowance was 10 to 15 mm, and the thicker the hot rolled steel plate was, the thicker it was. The trim cost has increased.

In No. 3, since the guide device of the meandering correction device was swung and the restraint device was operated, the plate was passed,
The amount of meandering has dropped to 0.7mm and 1.1mm, and the trim margin is 3 ~
It became 5 mm.

No. 4 was a case where the conventional meandering correction device (FIG. 7) was used, and the meandering amounts were 4.5 mm and 7.8 mm, and the trim allowance was 15 to 20 mm.

Next, under the conditions of No. 2 and No. 3, steady meandering was generated on the upstream side, and the tension distribution on the exit side of the meandering correction device was measured using a strain gauge.

FIG. 11 is a view showing the tension distribution obtained in the above test. From the figure, when the restraint device of the present invention is used (No. 3), the fluctuation of tension is 1.8 to 2.3 kgf / Although there is little fluctuation in the width direction of mm ² , the fluctuation of tension when the restraint device is not used (No. 2) is 0.8 to 4.7 kgf / mm ² and the fluctuation in the width direction is large. Further, No. 2 has a smaller meandering amount than No. 4, but it is not preferable because it causes uneven tension in the strip.

From these results, the device of the present invention has a better meandering correction ability than the conventional meandering correction device, and moreover, this device has a restraint device provided between the guide device and the meandering detector of the meandering correction device. Therefore, the fixed roll, which has been required in the past, is not required, and it can be installed in a small space.

(Example 2) Under the conditions of Inventive Example No. 3 of Example 1, the same test was conducted by replacing the restraining roller of the restraining device with a pinch roll as shown in FIG. The results are also shown in Table 1.

From these results, it is understood that even if the restraint roller of the restraint device is replaced with a pinch roll, substantially the same effect can be obtained. It was also found that the meandering correction effect is not related to the presence or absence of lining.

[0064]

According to the meandering correction method of the present invention, the strip on the output side of the guide device for correcting the meandering is constrained and the strip is moved in the width direction according to the amount of the meandering correction. It is possible to prevent the occurrence of fluctuations. As a result, the work of the next process is not adversely affected.

Further, in the meandering correction device of the present invention, since the restraint device is provided between the guide device for meandering correction and the meandering detector, the fixed roll which has been conventionally required is not necessary and can be installed in a small space. it can. When the meandering correction device of the present invention is installed in the front stage of the trimmer device to correct the meandering,
The trim allowance can be reduced, and the ear line can be eliminated even with a welded portion such as a welded portion that is likely to meander. As a result, it is possible to eliminate troubles such as a reduction in the threading speed and a line stop.

[Brief description of drawings]

FIG. 1 is a view showing a trimmer line in which a meandering correction device of the present invention is arranged.

FIG. 2 is a view showing a meandering correction device in which a guide device and a restraint device are connected to each other.

FIG. 3 is a view showing a meandering correction device of the present invention in which a pinch roll is used as a restraint device.

FIG. 4 is a diagram showing a method of controlling the interlocking of the guide device and the restraint device.

FIG. 5 is a diagram showing a method of controlling the interlocking of the guide device and the restraint device.

FIG. 6 is a diagram showing a steering type meandering correction device.

FIG. 7 is a view showing a conventional displacement type meandering correction device.

FIG. 8 is a diagram showing a conventional displacement type meandering correction device.

FIG. 9 is a diagram showing a principle that meandering is corrected by turning a guide roll.

FIG. 10 is a diagram showing a state in which the pass line of the strip changes due to the turning of the guide roll.

FIG. 11 is a view showing a tension distribution generated in a strip by correcting meandering.

[Explanation of symbols]

1. Guide device 1-1, 1-2. Guide roll
1-3. Revolving frame 1-4. Base frame 1-5. Actuator
1-6. Center of turning 2. Meander detector 3-1, 3-2. Fixed roll
4. Restraint device 4-1. Restraint roller 4-2. Slide base
4-3. Actuator 4-4. Housing 4-5. Pinch roll
5. Trimmer 6. Displacement meter S. strip
7. Connection culm 8. Actuator

Claims (2)

[Claims] 1. A restraint device having staggered restraint rollers or pinch rolls is arranged between a displacement type guide device and a meandering detector, and the restraint device follows the rotation of the guide device. The meandering correction device is arranged on a slide base that moves in the width direction of the strip. 2. A meandering correction method, which comprises performing displacement-type meandering correction, restraining the strip on the output side of the guide device, and moving the strip in the width direction according to the amount of meandering correction.