KR20200023901A - Apparatus and method for controlling flatness of plate - Google Patents

Abstract

The present invention relates to an apparatus for controlling flatness of a thick plate, which includes: a wave detection unit for detecting occurrence of a wave over time on a blade plate being cooled; a control unit for calculating a difference in elongation between the center portion of the blade plate and a width-direction edge of the blade plate based on wave information detected through the wave detection unit and calculating a roller bending amount of a roller corrector in the direction for forcibly inducing a wave in the center portion of the blade plate in response to the difference in elongation; and a roller correcting unit bending a roller of the roller corrector under control of the control unit.

Description

Flat plate control device and method {APPARATUS AND METHOD FOR CONTROLLING FLATNESS OF PLATE}

The present invention relates to an apparatus and method for controlling flatness of a thick plate, and more particularly, by predicting a side wave that may occur during air cooling after rolling in manufacturing a thick plate material, and inducing a center wave in a roller straightener in advance, finally, the side wave. An apparatus and method for controlling flatness of a thick plate to enable the production of a flat plate with reduced occurrence of

In general, a thick plate is produced in a desired size through a heating process, a rolling process, a cooling process, a hot calibration process, and a cooling stand, and when the flatness of the thick plate is judged to be good through the inspection process, a plurality of units are finished. Manufactured through processes.

At this time, bending and wave may occur on the surface of the rolled material while undergoing uneven rolling and cooling in the hot rolling process. If it is determined that the flatness is not good in the inspection process, it is cold Perform a calibration (roller calibrator) or press calibration.

Then, when the flatness is good by a subsequent process such as cold calibration or press calibration, the edge and front and rear ends of the blade are cut and manufactured into a product (thick plate).

Background art of the present invention is disclosed in Republic of Korea Patent Publication No. 10-2009-0043392 (2009.05.06. Publication, the manufacturing method of the thick plate and the device).

According to one aspect of the invention, the present invention is to provide an apparatus and method for controlling the flatness of the thick plate to reduce the side wave that may occur during cooling during manufacture of the thick plate material.

According to another aspect of the present invention, the present invention predicts the side wave that may occur during the air cooling after rolling in the manufacture of the thick plate material to induce the center wave in the roller straightener in advance, thereby finally producing a flat plate with reduced side wave generation It is to provide an apparatus and a method for controlling flatness of a thick plate that can be produced.

An apparatus for controlling flatness of a thick plate according to an aspect of the present invention may include: a wave detector configured to detect wave generation over time of a cooling blade; On the basis of the wave information detected by the wave detection unit, the difference in elongation between the blade center portion and the widthwise edge portion of the blade is calculated, and in the direction forcing the wave in the center of the blade corresponding to the difference in the elongation, roller A controller for calculating a roller bending amount of the straightener; And a roller straightening unit for bending the roller of the roller straightener under the control of the controller.

In the present invention, the wave detector, using at least one or more sensors, detects wave information for the front end, the rear end, the edge, and the center of the blade, the wave information, the wave position, And a number of waves generated per unit length.

In the present invention, the control unit controls the bending amount for bending the roller in two or multiple stages, or the bending amount specified by the bending information corresponding to the wave information of the wave generated on the blade without distinguishing the bending amount control step. It is characterized by controlling.

According to another aspect of the present invention, there is provided a method for controlling flatness of a thick plate, including: detecting, by a controller, wave generation over time of a blade being cooled through a wave detector; Calculating, by the controller, a difference in elongation between the blade center and the widthwise edge portion of the blade based on the wave information detected by the wave detector; Calculating, by the controller, the roller bending amount of the roller straightener in the direction of forcibly inducing a wave in the center of the blade in response to the difference in elongation; And bending the roller of the roller straightener through the roller straightening unit according to the calculated roller bending amount.

In the present invention, when a wave occurs in the blade, the controller detects wave information for the front end, the rear end, the edge, and the center of the blade through the wave detection unit, wherein the wave information, And a number of generated waves per unit length.

In the present invention, as a result of detecting whether a wave is generated on the blade, when the generation of the center wave is detected on the blade, the control unit controls to keep the roller bending amount in the current state, even when the next blade production Characterized in that the occurrence.

In the present invention, when detecting that the wave is generated on the blade, when neither the center wave nor the side wave is detected on the blade, the control unit, based on a predetermined roller bending amount control step, the roller bending amount It is characterized in that forcing the center wave to the center of the blade by adjusting the bending state.

In the present invention, when it is detected whether a wave is generated in the blade, when the center wave is not generated and only the side wave is detected in the blade, the controller is configured to control the roller based on a preset roller bending amount control step. The bending amount is adjusted to a strong bending state, characterized by forcibly inducing a center wave in the center of the blade.

According to an aspect of the present invention, the present invention allows to reduce the side wave that may occur during cooling during the manufacture of the thick plate material.

According to another aspect of the present invention, the present invention predicts the side wave that may occur during the air cooling after rolling in the manufacture of the thick plate material to induce the center wave in the roller straightener in advance, thereby finally producing a flat plate with reduced side wave generation To produce.

1 is an exemplary view showing a schematic configuration of a flatness control device of a thick plate according to an embodiment of the present invention.
2 is a flowchart illustrating a flatness control method of a thick plate according to an embodiment of the present invention.
Figure 3 is an exemplary view showing a picture taken a process in which the side wave is increased as the air cooling time of the general thick plate material elapses.
Figure 4 is an exemplary view shown to explain the general bending control principle.
5 is an exemplary view showing a photograph of a state in which the blade is flattened during cooling after inducing a center wave to the blade in advance in FIG. 1.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of the flatness control apparatus and method of the thick plate according to the present invention.

In this process, the thickness of the lines or the size of the components shown in the drawings may be exaggerated for clarity and convenience of description. In addition, terms to be described below are terms defined in consideration of functions in the present invention, which may vary depending on the intention or convention of a user or an operator. Therefore, the definitions of these terms should be made based on the contents throughout the specification.

1 is an exemplary view showing a schematic configuration of a flatness control device of a thick plate according to an embodiment of the present invention.

As shown in FIG. 1, the apparatus for controlling flatness of a thick plate according to the present embodiment includes a wave detector 110, a controller 120, and a roller correction unit 130.

The wave detector 110 detects waves (eg, side waves and center waves) that may occur in the blade of the cooling zone.

The side wave is a wave generated at the edge portion in the width direction of the blade, and the center wave is a wave generated at the center of the blade.

The wave detector 110 uses at least one sensor (eg, an image sensor line, a laser sensor, an ultrasonic sensor, etc.) to perform wave information on the front end, the rear end, the edge, and the center of the blade, such as a wave. The number of waves generated per position and unit length).

For reference, the wave is generated by a difference in elongation (ratio of cutting without being cut off) between the central portion of the blade and the widthwise edge portion of the blade.

For example, the occurrence of side waves means that the edge portion in the width direction of the blade has higher elongation than the center portion. Typically, edge waves are mainly generated on the blade by the widthwise roll bending phenomenon.

FIG. 3 is an exemplary view showing a photograph of a process in which a side wave is increased as the air cooling time of a general thick plate material is elapsed. FIG. 3 is shown in FIG. 3 according to a difference in elongation between a central portion of the blade and a widthwise edge portion. As can be seen, as time passes ((a) → (e)) during air cooling after rolling (ie, as the thick plate material is cooled), the side wave is increased.

When the side wave occurs in the thick plate material as described above, as described above, conventionally performed a cold calibration (roller straightener) or press calibration in a subsequent process. In other words, in the past, the subsequent step of flattening by flattening the side wave already generated in the thick plate material.

As a result, as the subsequent step is further performed, productivity is reduced and production costs are increased.

Therefore, in order to improve productivity and reduce production costs, flatness should be improved without additionally performing subsequent processes as much as possible.

Accordingly, the control unit 120 based on the wave information detected by the wave detection unit 110 (for example, the location of the wave and the number of waves generated per unit length, etc.), the difference in elongation (for example, the center of the blade and the Elongation difference between the widthwise edge portions of the blade.

In addition, the controller 120 calculates a bending amount corresponding to the difference in elongation (for example, a difference in elongation between the center of the blade and the edge portion in the width direction of the blade).

In addition, the control unit 120 controls the roller bending of the roller straightener in the direction of inducing a wave in the center of the blade corresponding to the calculated bending amount. That is, the controller 120 applies the calculated bending amount to the production process of the next blade.

The roller straightener 130 bends the roller of the roller straightener under the control of the controller 120. In this case, the bending amount for bending the roller may vary depending on wave information (eg, the location of the wave and the number of waves generated per unit length) of the wave generated on the blade.

For example, the bending amount for bending the roller may be controlled by dividing it into two stages (eg, strong, weak), or may be controlled by dividing it into more multi-levels (eg, 1, 2, 3, 4, 5, etc.) It may be. Of course, it is also possible to directly control the designated bending amount corresponding to the wave information of the wave generated in the blade without distinguishing the bending amount step.

4 is an exemplary view illustrating a general bending control principle.

는 곡률반경,

는 교정롤번호,

은 롤피치,

는 교정압하량을 의미한다.Figure 4 (a) is an exemplary view shown to explain the correction pressure vs. curvature relationship, Equation 1 below describes the curvature relationship, where

Radius of curvature,

Is the calibration roll number,

Silver roll pitch,

Means calibration pressure drop.

Figure 4 (b) is an exemplary view shown to compare the center (center) -edge curvature radius according to the bending application, the radius of curvature of the center relative to the radius of curvature of the edge is relatively larger, and also depending on the calibration roll number There is a difference in the magnitude of the radius of curvature.

2 is a flowchart illustrating a flatness control method of a thick plate according to an embodiment of the present invention.

As shown in FIG. 2, the control unit 120 detects whether a wave occurs in the center or side of the blade currently being produced through the wave detection unit 110 (S101).

That is, the controller 120 determines whether the wave is generated at the center or the side according to the passage of time (for example, after 0 minutes and after 40 minutes) of the blade currently in the cooling zone through the wave detection unit 110. If a wave is generated, the wave information (for example, the location of the wave and the number of waves generated per unit length) are detected.

Although not specifically shown in the drawings, the difference in elongation (for example, between the center of the blade and the edge in the width direction of the blade) based on the wave information (for example, the location of the wave and the number of waves generated per unit length, etc.). Elongation difference) is calculated.

In addition, the roller bending amount (or bending amount) preset in the form of a database (or look-up table) is calculated in response to the difference in the elongation (for example, the difference in elongation between the center of the blade and the edge portion in the width direction of the blade). The roller bending of the roller straightener is controlled in a direction inducing a wave in the center of the blade corresponding to the bending amount.

As a result of detecting whether a wave is generated at the center or side of the blade, when the occurrence of the center wave is detected (YES in S102), the controller 120 determines a roller bending amount (or bending amount) in a current state (eg, roller). Hold in parallel) (S104).

That is, when cooled in the cooling stand in the state where the wave is generated in the center of the blade, it is possible to produce a flat plate material in which the occurrence of the side wave is finally reduced during the cooling process.

Also, when it is detected whether a wave occurs in the center or side of the blade, when neither the center wave nor the side wave is detected (that is, when a flat blade is produced) (NO in S103), the controller 120 The roller bending amount (or bending amount) is adjusted to a weak bending state (S105).

In other words, when the blade is moved to the cooling stand in the flat state to cool, the side wave will be generated during the cooling process, so that the center wave is forcibly guided by the roller straightener, thereby reducing the occurrence of the side wave. Enable production of boards

However, the bending amount for bending the roller may be controlled by dividing into two stages (eg, strong, weak) or multiple stages (eg, 1, 2, 3, 4, 5, etc.).

In addition, if it is detected that a wave is generated in the center or side of the blade, and if only a center wave is detected without generating a center wave, the controller 120 sets the roller bending amount (or bending amount) to a strong bending state. It adjusts (S106).

In other words, if the side plate is already generated in the blade plate and moved to the cooling stand to cool, since the side wave will be additionally generated during the cooling process, correspondingly by forcing the center wave in advance in the roller straightener, Finally, it is possible to produce a flat plate with reduced side wave generation.

However, the bending amount for bending the roller may be controlled by dividing into two stages (eg, strong, weak) or multiple stages (eg, 1, 2, 3, 4, 5, etc.).

FIG. 5 is an exemplary view showing a photograph of a state in which the blade is flattened during cooling after inducing a center wave to the blade in advance.

When inducing the center wave in advance in the production of the blade as shown in Figure 5 (a), as shown in Figure 5 (b) has the effect of canceling the side wave generated in the process of cooling the blade in the cooling zone, As a result, it is possible to produce a flat plate having reduced generation of side waves.

As described above, the present embodiment reduces the occurrence of side waves in the thick sheet material, thereby avoiding further follow-up processes such as cold calibration (roller straightener) and press calibration, resulting in improved productivity and reduced production cost. It has the effect of making it work.

Although the present invention has been described with reference to the embodiments illustrated in the drawings, this is merely exemplary, and various modifications and equivalent other embodiments are possible for those skilled in the art to which the art pertains. I will understand the point. Therefore, the technical protection scope of the present invention will be defined by the claims below.

110: wave detection unit
120: control unit
130: roller correction unit

Claims (8)

A wave detector for detecting wave generation over time of the cooling blade;
On the basis of the wave information detected by the wave detection unit, the difference in elongation between the blade center portion and the widthwise edge portion of the blade is calculated, and in the direction forcing the wave in the center of the blade corresponding to the difference in the elongation, roller A controller for calculating a roller bending amount of the straightener; And
And a roller straightening unit for bending a roller of the roller straightener under the control of the controller.
The wave detector of claim 1, wherein the wave detector comprises:
Using at least one or more sensors to detect wave information for the leading end, trailing edge, edge, and center of the blade,
The wavelet information, the flatness control device of the thick plate, characterized in that it comprises a position where the wave occurs, and the number of waves generated per unit length.
The method of claim 1, wherein the control unit,
The bending amount for bending the roller is controlled by dividing the bending amount into two or multiple stages, or by controlling the bending amount to be designated in correspondence to the wave information of the wave generated in the blade without distinguishing the bending amount control step. Road control device.
Detecting, by the controller, wave generation over time of the blade being cooled by the wave detector;
Calculating, by the controller, a difference in elongation between the blade center and the widthwise edge portion of the blade based on the wave information detected by the wave detector;
Calculating, by the controller, the roller bending amount of the roller straightener in the direction of forcing a wave in the center of the blade in response to the difference in elongation; And
And bending the roller of the roller straightener through the roller straightening unit according to the calculated roller bending amount.
The method of claim 4, wherein when the wave is generated in the blade,
The control unit detects wave information on the front end, the rear end, the edge, and the center of the blade through the wave detector,
The wavelet information, the position of the wave generation, and the flatness control method of the thick plate, characterized in that it comprises the number of waves generated per unit length.
The method of claim 4, wherein
As a result of detecting whether a wave is generated in the blade, when generation of a center wave is detected in the blade,
The control unit controls to maintain the roller bending amount in the current state, the flat plate control method of the thick plate, characterized in that the center wave occurs in the production of the next blade.
The method of claim 4, wherein
As a result of detecting whether a wave is generated in the blade, if neither the center wave nor the side wave is detected in the blade,
And the control unit adjusts the roller bending amount to a weak bending state based on a preset roller bending amount control step to forcibly induce a center wave at the center of the blade.
The method of claim 4, wherein
As a result of detecting whether a wave is generated in the blade, when a center wave is not generated in the blade and only a side wave is detected,
And the control unit adjusts the roller bending amount to a strong bending state based on a preset roller bending amount control step to induce a center wave to the center of the blade.

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