JPH08313246A - Method and apparatus for detection of shape of rolled sheet - Google Patents

Abstract

PURPOSE: To precisely detect the shape of a rolled sheet by a tension-distribution measuring system. CONSTITUTION: A tension-distribution measuring device 7 which measures the tension distribution in the width direction of a rolled sheet 2 is installed between a rolling mill 1 and a take-up reel 3. A coil-outside-diameter-distribution measuring device 8 by which the built-up shape of a coil 2a on the take-up reel 3 is found online is installed. A controller 9 by which the output of the tension- distribution measuring device 7 is corrected on the basis of the output of the coil-outside-distribution measuring device 8 so as to be used as the shape detection value of the rolled sheet 2 is provided. A correction factor which estimates and patterns the tension distribution of the rolled sheet 2 generated owing to the outside diameter distribution in the width direction of the coil 2a at a time when the flat rolled sheet 2 has been taken up on the take-up reel 3 is input to the controller 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for detecting the shape of a rolled plate which is used for accurately detecting the shape of a rolled plate rolled by a rolling mill and wound by a take-up reel.

[0002]

2. Description of the Related Art It is important in terms of product quality to make the shape (flatness) of a rolled plate rolled by a rolling mill uniform. Therefore, various automatic plate shape control devices for controlling the shape of the rolled plate to a target shape have been proposed and already put into practical use.

The above-mentioned automatic plate shape control device, as shown in FIG. 2 as an example of application to a cold finish rolling line, includes a rolling mill 1 at the final stage and a rolling plate 2 rolled by the rolling mill 1 into a coil 2a. A shape detector 4 for detecting the shape of the rolling plate 2 is provided at a position between the winding reel 3 and the take-up reel 3. Based on the output of the shape detector 4, the controller 5 causes the rolling mill 1 to move. The plate shape control is performed by sending a control command to the shape control actuators such as the bending device and the rolling-down device provided. 6 indicates a deflector roll.

[0004]

However, as the shape detector 4 used in the above automatic plate shape control device,
Although there are tension distribution measurement methods, optical methods, magnetic vibration methods, etc., when the tension distribution measurement method is used, there is a problem that the plate shape cannot be accurately detected because of the influence of the disturbance due to the outer diameter distribution of the coil 2a. is there. That is, when rolling the rolled plate 2 into a coil with the take-up reel 3, the coil 2
Since the built-up shape of a is not a perfect cylindrical shape and the outer diameter is not constant in the width direction and becomes a barrel shape or a drum shape, a rolling plate between the take-up reel 3 and the rolling mill 1 is formed. 2 is unevenly tensioned, and the tension distribution of the rolled plate 2 is affected by the outer diameter of the coil 2a.
Therefore, although the rolling plate 2 is flatly rolled by the rolling mill 1, the shape detector 4 detects that the rolling plate 2 has middle stretch, edge stretch, or the like. There is a problem that the correct plate shape cannot be detected.

Therefore, the present invention provides a method for detecting the shape of a rolled plate, which can accurately detect the shape of the rolled plate by a tension distribution measuring method in consideration of the disturbance associated with the outer diameter distribution of the coil in the width direction. It is intended to provide a device.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a tension distribution in the width direction of a rolled plate rolled by a rolling mill and wound into a coil by a take-up reel. Rolling is measured at a position between the rolling mill and the take-up reel, and the width-direction outer diameter distribution of the coil on the take-up reel is measured to predict the measured value of the coil width-direction outer diameter distribution. Correct the measured value of the width direction tension distribution of the rolled plate based on the plate tension distribution, and use the corrected value of the width direction tension distribution of the rolled plate as the plate shape detection value of the rolled plate. The detection method.

Further, a tension distribution measuring device for measuring the tension distribution in the width direction of the rolled plate is provided between the rolling mill and the winding reel for winding the rolled plate rolled by the rolling mill into a coil. At the same time, a coil outer diameter distribution measuring device for measuring the outer diameter distribution in the width direction of the coil wound around the winding reel is installed so as not to contact the coil, and the outer diameter distribution in the coil width direction. A controller that predicts and inputs the tension distribution generated in the rolled sheet due to the above is provided, and the output of the coil outer diameter distribution measuring instrument and the output of the tension distribution measuring instrument are input to the controller to obtain the tension. A rolled plate shape detection device having a configuration in which a distribution measurement value is corrected by a controller.

[0008]

The tension distribution measuring device measures the widthwise tension distribution of the rolled plate. At this time, the coil outer diameter distribution measuring device obtains the coil width direction outer diameter distribution and inputs it to the controller. Since the tension distribution of the rolled plate caused by the coil outer diameter distribution is predicted and input to the controller, the output of the tension distribution measuring device is corrected based on the input tension distribution. . Therefore, the correct plate shape can be accurately detected without being affected by the outer diameter distribution of the coil in the width direction.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of the present invention.
In the cold finish rolling line as in the case shown in FIG. 1, the tension distribution in the width direction of the rolled plate 2 rolled by the rolling mill 1 and wound as the coil 2a by the take-up reel 3 is measured by the rolling machine 1 and the rolling mill 1. On the other hand, the widthwise outer diameter distribution of the coil 2a on the take-up reel 3 is measured online as a built-up shape signal to measure the position between the take-up reel 3 and the change in the built-up shape. The tension distribution of the rolled plate 2 that is generated as a result is predicted and input to the controller 9, and the measured value of the tension distribution in the width direction of the rolled plate 2 is input to the controller 9 and the controller 9 is input to the controller 9. By correcting the width direction tension distribution measurement value of the rolling plate 2 based on the coil width direction outer diameter distribution measurement value, the correct width direction tension distribution of the rolling plate 2 is made the plate shape detection value of the rolling plate 2. To do so.

More specifically, as shown in FIG. 1A, a rolling mill 1 and a rolling plate 2 rolled by the rolling mill 1 are connected to a coil 2a.
A tension distribution measuring device 7 for measuring the shape (flatness) of the rolled plate 2 as a tension distribution in the plate width direction is provided at a position between the take-up reel 3 and the take-up reel 3. As shown in Fig. 1 (b), a plurality of positions (for example, five)
The coil outer diameter distribution measuring device 8 is installed by arranging the laser displacement gauges 8a in parallel with the coil 2a so as to be in non-contact with each other in the coil width direction at a required interval.
To measure the built-up shape of the coil 2a as an outer diameter distribution in the width direction, and further input the output of the coil outer diameter distribution measuring instrument 8 and the output of the tension distribution measuring instrument 7 to obtain the tension distribution. The output of the measuring instrument 7 is corrected so that the corrected strip width direction tension distribution is displayed on the monitor 10, and a control command based on the corrected strip width direction tension distribution is sent to the shape control actuator of the rolling mill 1. The controller 9 is provided.

The coil outer diameter distribution measuring device 8 includes a coil 2
The outer diameter distribution of a is determined by approximating the outer diameter distribution by a higher-order curve using a plurality of measurement points in the width direction of the outer diameter surface.
Further, when the rolling plate 2 is wound on the winding reel 3 in order to correct the width direction tension distribution of the rolling plate 2 which is affected by the width direction outer diameter distribution of the coil 2a, Predicting the tension distribution of the rolled plate 2 that occurs near the tension distribution measuring device 7 of the rolled plate 2 due to the width-direction outer diameter distribution for each of several patterns based on different width-direction outer diameter distributions It is entered as a correction factor.

In a state where the rolled plate 2 rolled by the rolling mill 1 is wound as the coil 2a by the take-up reel 3, the tension distribution is measured at a position between the rolling mill 1 and the take-up reel 3. The tension distribution in the width direction of the rolled plate 2 is measured by the vessel 7,
The output is put into the controller 9. On the other hand, on the surface of the coil on the take-up reel 3, the built-up shape of the coil 2a is obtained as the width-direction outer diameter distribution measurement value by the coil outer diameter distribution measuring device 8, and the output is input to the controller 9.
In the controller 9, since the correction coefficient based on the predicted tension distribution for each width-direction outer diameter distribution of the coil is input, the tension distribution measurement device 7 calculates the tension distribution based on the output from the coil outer diameter distribution measurement device 8. Corrected to exclude from the value measured in
The true widthwise tension distribution of the rolling plate 2 that is not affected by the coil widthwise outer diameter distribution is displayed on the monitor 10, and the shape control command based on the correct widthwise tension distribution measurement value is used to control the shape of the rolling mill 1. It is sent to the actuator for shape control.

Therefore, even if the widthwise outer diameter distribution of the coil 2a acts as a disturbance on the rolled plate 2 between the time when it is rolled by the rolling mill 1 and the time when it is wound by the take-up reel 3, the tension is reduced. Since the disturbance component is subtracted from the output of the distribution measuring device 7 to be corrected, the value measured by the tension distribution measuring device 7 can be a value that accurately detects the shape of the rolled plate 2. It is possible to prevent a situation in which an incorrect control command is sent to the shape control actuator of the rolling mill 1, and improve the product quality of the rolled plate 2.

The present invention is not limited to the above-mentioned embodiments, but it is optional to employ it in a leveler line after cold rolling which has a strict shape requirement, and other gist of the present invention. It goes without saying that various changes can be made without departing from the scope.

[0016]

As described above, according to the present invention, it is possible to measure the widthwise tension distribution of a rolled plate wound in a coil on a take-up reel at a position upstream of the take-up reel by a tension distribution measuring device. In addition, the outer diameter distribution of the coil on the take-up reel in the width direction can be measured by the coil outer diameter distribution measuring instrument, and the tension distribution measuring instrument is controlled by the controller based on the output of the coil outer diameter distribution measuring instrument. Since the true tension distribution is obtained by correcting the output of the coil, the correct shape of the rolled plate can be accurately detected even if the effect of the coil outer diameter distribution acts as a disturbance on the tension of the rolled plate. It has the excellent effect of being able to.

[Brief description of drawings]

FIG. 1 is a diagram showing an outline of an embodiment of a rolled plate shape detecting device of the present invention, in which (a) is an overall schematic diagram adopted in a cold rolling line, and (b) is a plane of a coil in (a). It is a figure which shows the example of arrangement | positioning of the coil outer diameter distribution measuring instrument on a figure.

FIG. 2 is a schematic diagram showing an example of an automatic plate shape control device.

[Explanation of symbols]

 1 Cold finish rolling mill 2 Rolled plate 2a Coil 3 Take-up reel 7 Tension distribution measuring instrument 8 Coil outer diameter distribution measuring instrument 9 Controller

Claims (2)

[Claims] 1. A method for detecting the shape of a rolled plate, comprising: measuring a tension distribution in a width direction of the rolled plate rolled by a rolling mill and wound into a coil by a winding reel; The tension distribution measurement value in the width direction of the rolled plate measured at the position between the rolling mill and the take-up reel is generated due to the outer diameter distribution in the width direction of the coil on the take-up reel. Predictive input into the controller entered, correct the width direction tension distribution measurement value of the rolling plate with the controller based on the coil width direction outer diameter distribution measurement value, and correct the width direction of the rolling plate. A method for detecting the shape of a rolled plate, wherein the measured value of the tension distribution is used as a detected value of the plate shape of the rolled plate. 2. A tension distribution measuring device for measuring a width-direction tension distribution of the rolled plate is provided between the rolling mill and a winding reel for winding the rolled plate rolled by the rolling mill into a coil shape. At the same time, a coil outer diameter distribution measuring device for measuring the outer diameter distribution in the width direction of the coil wound around the winding reel is installed so as not to contact the coil, and the outer diameter distribution in the coil width direction. A controller that predicts and inputs the tension distribution generated in the rolled sheet due to the above is provided, and the output of the coil outer diameter distribution measuring instrument and the output of the tension distribution measuring instrument are input to the controller to obtain the tension. An apparatus for detecting the shape of a rolled plate, which has a configuration in which a distribution measurement value is corrected by a controller.