JP2751403B2 - Strip meandering correction device - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to an apparatus for performing strip meandering over a continuous strip processing line.

(Prior art) In a strip such as a thin steel strip, there is a constant meandering caused by a camber (inferior shape) inevitably occurring or a local meandering caused by a welding seam when there is a welding seam. Can be seen. Naturally, such meandering impedes normal threading of the strip, and when the meandering amount exceeds a certain limit, various obstacles are caused, and in some cases, the threading is impossible. In addition, when trimming a strip, for example, accurate centering of ± 2 mm is required.

Therefore, conventionally, there are a displacement guide type meandering correction device and a steering guide type meandering correction device as general devices for correcting strip meandering in a continuous strip processing line.

The meandering correction device of the displacement guide type
It is composed of two or two rolls. For example, in the case of two rolls, the apparatus shown in FIGS. 1 (a) and 1 (b) is generally used. Furthermore, in the case of passing through the S shape,
The apparatus shown in FIGS. 2A and 2B is used.

FIGS. 1 (a) and 2 (a) are side views of a conventional meandering prevention device, and FIGS. 1 (b) and 2 (b) are plan views, respectively.

As shown in FIGS. 1 (a) and 2 (a), the strip 1 entering the meandering prevention device goes around the rolls 6, 7 supported and fixed to the frame 5 and passes through the meandering detector 2. Come out. Rolls 6 and 7 supported by frame 5
The actuator 4 is turned around the fulcrum 10 together with the frame 5 in the directions indicated by arrows in FIGS. 1 (b) and 2 (b). Reference numeral 3 indicates the entire support base.

FIG. 3 shows a strip passing path when the meandering correction is performed by the apparatus shown in FIGS. 1 and 2 when viewed from above the line.

To explain the mechanism of the meandering correction by these devices, for example, if a meandering amount of δ occurs upstream of the device as shown by the solid line in FIG. 3 during line operation, the meandering amount is determined by a meandering detector. 2 detected. Therefore, in order to cancel the meandering, the actuator 4 causes the frame 5 on which the rolls 6 and 7 are fixed to perform a swiveling motion of θ amount in the directions indicated by arrows in FIGS. 1 (b) and 2 (b). So that the center of the strip 1 is on the roll center line. The roll position after turning is indicated by a solid line in the figure. The center line of the roll does not coincide with the center of the process line, which moves the center line of the roll in line with the meandering of the strip. In the figure, V indicates the passing speed in the direction of the outlined arrow. At this time, the relationship between the meandering amount and the correction amount is generally expressed by δ = Lsinθ (1) L: swing radius θ: turning angle.

Next, the meandering correction by the steering guide type meandering correction device will be described. The basic principle of the meandering correction by this device is that, as shown in FIG. 4, the angle of the roll 6 on the entrance side of the strip 1 that has entered the roll 6 while meandering at the position shown by the dotted line in the figure is only ζ. When the strip is inclined about the center point 11 with respect to the strip, the feed angle of the strip with respect to the roll becomes non-perpendicular, so that a feed of γ in the lateral direction occurs as shown by a solid line in the drawing. Thus, the feeding corrects the meandering of the strip. That is, in this case, the meandering strip moves on the roll so that the center of the strip coincides with the center of the roll. The traveling direction of the strip 1 is indicated by a white arrow.

In FIG. 4, the roll tilt center is located on the axial center of the roll and on the center of rotation. This center position is determined by the layout of the line to be introduced, line speed, line tension,
It is selected at a position below the center of rotation of the roll, depending on the material of the strip, the response of meandering correction, and the like. For example, it is a position below the center 11 in FIG. In addition, the roll tilt center may be provided outside, and the former roll motion may be referred to as a roll swing to distinguish from the roll tilt in that case.

As can be seen from the mechanism, the conventional two systems have a quick response in the case of the displacement guide type, and therefore are suitable for correcting local meandering caused by the aforementioned welding seam, while the steering guide is used. In the case of the mold, it is said that the self-adjusting action works, so that the mold is suitable for correcting the steady meandering caused by the camber.

(Problems to be Solved by the Invention) However, the conventional displacement guide type meandering correction device only corrects the path of the strip only at the output side of the device. In other words, the strip remains off-center with respect to the roll in the meandering correction device because the meandering detector is provided only on the device exit side. That is, there is no correction capability at the apparatus entrance side. For this reason, when a strip shape defect or the like is observed, a meandering state may be constantly maintained with the center being off-centered to one side. At that time, the apparatus continues to swing largely to one side. However, the meandering also changes greatly over time, and from the point of view of the correction capability of the device,
It is desirable that both have the same swing width.

On the other hand, in the case of a steering guide type meandering correction device, since the meandering correction is performed from the roll entrance side on the meandering correction device, the strip is centered on the roll even when the centering is being performed. . However, it is inferior in correction response and accuracy compared to a displacement guide type correction device.

Particularly, in recent years, since high-speed continuous processing of a large number of strips has been adopted in many manufacturing processing steps, it has often been experienced that high-speed threading must be performed with high precision. . In addition, accurate and prompt response to sudden meandering is required, and situations in which these requests can no longer be completely satisfied by the prior art have come to be considered.

Accordingly, an object of the present invention is to provide a high-precision meandering correction device that has a centering ability from the entrance roll of the meandering correction device and can quickly cope with larger meandering.

(Means for solving the problem) Therefore, when these are examined, first, as a base material factor among the meandering occurrence factors, as already mentioned briefly earlier,
There are misalignment or poor connection angle at the seam of the strip, middle elongation, camber or strip seam. For example, if the ear wave, middle elongation, etc. continue for a certain amount, the strip often meanders to one side during that time. Even when the base material has a camber, similarly, the off-center amount according to the camber amount in the bending direction. Meandering. In the case of these meanders, the meandering amount change is usually gradual except for the case where the plate shape changes extremely, so that the meandering correction by the steering type has a large effect. Conversely, meandering due to connection misalignment or poor angle occurs locally and suddenly, so that the good response of the displacement guide type device is effective. In other words, it was found that, by using a meandering correction device having two different functions in combination, unexpectedly, higher accuracy and higher capacity meandering correction can be performed irrespective of the type of meandering, which was a problem conventionally. Was.

Therefore, the present invention is a continuous running line of the strip,
A displacement guide type meandering correction device for correcting the meandering of a strip by passing the strip in a U-shape by two rolls, in which a roll on the entry side of the strip is inclined with respect to a pass line of the strip before the roll entry side. A meandering correction apparatus characterized by comprising means.

From another aspect, the present invention is a displacement guide type meandering correction device for correcting the meandering of a strip by passing the strip in an S shape by two rolls in a continuous running line of the strip, the strip comprising: Means for inclining the entrance roll of the strip with respect to the pass line of the strip before the entrance of the roll, and the strip and the roll between the entrance roll and the exit roll in a state where the entrance roll is not inclined. The meandering correction device is characterized in that the two rolls are disposed at a position where the front side strip is at a right angle to the front strip.

In the present invention, according to a preferred embodiment thereof, a means for raising and lowering the entry roll may be further provided. This means that, for example, as described above, if the strip meandering is corrected by tilting the entry roll upward about its outside, the height of the strip center will increase by almost half of the slope height at one end. . Therefore, it is necessary to lower the entire roll by this amount.

In order to further improve the meandering correction accuracy, a meandering amount detecting device may be further provided between the two rolls.

(Operation) Next, the meandering correction device according to the present invention will be described in more detail with reference to the accompanying drawings.

One example of the strip meandering correction device according to the present invention is shown in FIG. 5 (a) and FIG. 5 (b) in a side view and a plan view, respectively. The same members as those of the conventional device are denoted by the same reference numerals.

In FIG. 5, the strip 1 which has been passed through the rolls 6 and 7 fixed to the frame 5 and comes out in a U-shape, and in this example, the roll 6 is an actuator 8
, So that it can be inclined in the strip width direction. The roll 6 swings. The strip 1 exiting the roll 6 enters the roll 7 after the meandering detector 9 detects the meandering. Roll 7 is frame 5
And the actuator 4 together with the roll 6
The meandering of the strip 1 detected by the meandering detector 2 is corrected as in the conventional apparatus.

Here, the meandering correction function by the device shown in FIG. 5 will be described.

First, as described above, the strip 1 is passed through the meandering correction device. If the meandering occurs upstream at this point, the meandering will eventually proceed to the downstream, so that the detector 2
Is detected by In order to correct the meandering, the actuator 4 rotates the frame 5 so that the meandering amount in the detector 2 becomes zero. The relationship between the meandering amount and the turning angle at this time is expressed by the above-described equation (1). Corrections for transient meandering can now be made.

In the meandering, there is another meandering that occurs continuously for a certain period of time. In this case, in a normal displacement-type correction device, the frame 5 keeps swinging to one side. In a state where the strip is shaken, the strip passes through the center in a state where the strip is forcibly applied, which is not a very preferable state. Preferably, the front roll prevents meandering, minimizes frame runout, and avoids unreasonable straightening with the strip exit roll.

Therefore, in the device according to the present invention shown in FIG. 5, since the meandering amount in the device is detected by the meandering detector 9, the actuator 8 that tilts the device entrance roll 6 based on the detected amount is used. By using the function described above, the centering operation of the strip in the apparatus becomes possible. In other words, if the meandering phenomenon occurring in the line is caused by meandering that continues a certain amount of off-center, meandering in the apparatus can be eliminated by the roll 6, and the turning angle of the frame approaches zero. .

At this time, the inclination angle (ζ) of the roll 6 and the correction amount (γ)
Is expressed by the following equation.

γ = A · ζ (2) where A = A (w, t, E, T, L ₂ ) W: plate width t: plate thickness E: elastic coefficient T: tension L ₂ : steering roll Since the actual meandering phenomenon is a composite state of transient meandering and continuous meandering, if the device has response performance and self-centering function like this device, The meandering component,
Correction by the roll 6 makes it possible to always ensure the same amount of lateral displacement of the displacement guide with respect to the meandering component generated transiently. Therefore, according to the present invention, a device that can perform more stable and highly accurate meandering correction than the conventional displacement guide type and steering guide type devices has been realized.

Here, the function of the meandering correction device according to the present invention will be further described.

First, when the roll 6 is tilted with the center of the roll axis pivoted, the roll 7 and the roll 6 have a positional relationship shown in FIG. FIG. 6 is a diagram viewed from the direction of the thick arrow in FIG. 5, that is, viewed from the left hand side as in FIG. 7 described later.
At this time, by lowering the roll 6 with respect to the roll 7 by the amount of η shown in the following relationship, η = βsinζ (3), the strip between the roll 6 and the roll 7 is left and right. Non-uniform tension distribution can be prevented, and more precise control can be achieved. Here, β is the amount of meandering in the meandering detector 9.

The tilt angle ζ of the roll 6 is set by feedback control based on the amount of meandering of the detector 9. Apart from this, the amount of meandering in the device is calculated by detecting the turning angle of the meandering correction device. Therefore, the same correction can be made even if the inclination angle of the roll 6 is controlled based on the turning angle amount.

As a method of detecting the turning angle, a method of detecting the angle from the stroke amount of the actuator 4 is possible, or an angle detector may be separately provided.

8 (a) and 8 (b) show another modification of the present invention, in which the strip 1 passes around the rolls 6 and 7 in an S-shape. 9 and 10 are explanatory views of the meandering correcting mechanism by the apparatus of FIG. Even though FIG.
The same members and the same amounts as those in FIGS.

Next, the present invention will be described more specifically with reference to examples.

Example 1 As the meandering correction device after the accumulator of the continuous annealing line, the device of the present invention that moves in the range of the roll turning angle ± 7 ° and the inclination angle ± 1.5 ° (ζ) as shown in FIG. Noh was evaluated.

The meandering correction device used in this example had the structure shown in FIG. However, the lifting / lowering means of the roll 6 was not operated.

FIGS. 12 (a) and 12 (b) show the results of comparison of the relationship between the amount of meandering on the entry side and the device turning angle between the conventional device and the device according to the present invention. In the figure, the broken part of the graph indicates that the data when the camber direction of the strip was changed in the reverse direction was shown in the same graph.

 The conventional device is of the bus placement type.

As can be seen from the results in FIG. 12, compared to the conventional type, according to the device according to the present invention, the device in the case where a portion other than a suddenly meandering portion such as a welded seam portion is passed through Since the turning angle can be reduced to about 20% of the conventional angle,
The capacity that can be corrected for sudden meandering has increased, and stable meandering has been performed. As a result, the same or better performance was achieved with a correction capacity of about 1.8 times the meandering amount compared with the conventional one. This means that, under normal conditions, meandering adjustment can be performed with little change in the turning angle.

Further, even when local meandering such as a welded seam portion is observed, it can be seen that the response is promptly corrected as can be seen from the clear appearance of the peak portion of the graph.

Embodiment 2 In the present embodiment, a meandering correcting device shown in FIG. 5 according to the present invention having a turning angle of ± 5 ° and an inclination angle of ± 1.8 ° was introduced on the trimming line on the trimmer entrance side. Even in this case, since the turning angle of the apparatus can be reduced, the uneven pulling of the strip on the exit side of the apparatus is greatly reduced. As a result, the position accuracy of the strip on the trimmer was improved, and high-precision continuous trimming became possible.

Example 3 The same operation as in Examples 1 and 2 was carried out using the apparatus shown in FIG. 8, and results having a similar tendency were obtained.

(Effects of the Invention) As is clear from the above description, according to the present invention, the following effects can be obtained as compared with the conventional apparatus.

For example, more accurate and stable correction than ± 1 mm is possible.

Larger meanders can be handled.

Since non-uniform pulling at the exit side of the device is reduced, the device can be installed immediately before a device requiring high-precision positioning such as a trimmer.

[Brief description of the drawings]

1 (a) and 1 (b) are a side view and a plan view, respectively, of a conventional displacement type meandering correction device; FIGS. 2 (a) and (b) are also a conventional displacement type meandering correction device. FIG. 3 is a schematic explanatory view of a meandering correction mechanism by a conventional device; FIG. 4 is a schematic explanatory view of a meandering correction mechanism by a roll tilting method by a conventional device; FIG. And (b) are a side view and a plan view, respectively, of the meandering correction device according to the present invention; FIG. 6 is an explanatory diagram of a relative positional relationship due to roll tilting in the device of the present invention; 8 (a) and (b) are another side view and plan view of the meandering correction device according to the present invention. 9 is an explanatory view of a relative positional relationship due to roll tilt in the apparatus of the present invention shown in FIG. 8; FIG. 10 is an explanatory view of a positional relation between a roll and a strip by roll elevating in the apparatus of the present invention; FIGS. 12 (a) and 12 (b) are graphs showing the results of the conventional example and the example of the present invention. 1: strip, 2: meandering detector 3: frame, 4: actuator 5: frame, 6: inlet roll 7: outlet roll, 8: actuator 9: meandering detector, 10: center of rotation

Claims (4)

(57) [Claims] 1. A displacement guide type meandering correction device for correcting a meandering of a strip by passing the strip in a U-shape by two rolls in a continuous running line of the strip, wherein a roll on an entrance side of the strip is rolled. A meandering correcting device, comprising: means for inclining with respect to a pass line of a strip in front of the meandering strip. 2. A displacement guide type meandering correction device for correcting the meandering of a strip by passing the strip in an S-shape by two rolls in a continuous running line of the strip, wherein a roll on an entrance side of the strip is rolled. Means for inclining with respect to the pass line of the front-side strip are provided, and the strip between the entrance-side roll and the exit-side roll and the roll entrance-side front strip are at a right angle when the entrance-side roll is not inclined. A meandering correction device, wherein the two rolls are arranged at the following positions. 3. The apparatus according to claim 1, further comprising means for raising and lowering the entrance roll. 4. The apparatus according to claim 1, further comprising a meandering amount detecting device between the two rolls on the entrance side and the exit side.