KR101701645B1 - Apparatus for correcting front-end bending of steel plate and method thereof - Google Patents

Apparatus for correcting front-end bending of steel plate and method thereof Download PDF

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KR101701645B1
KR101701645B1 KR1020150147991A KR20150147991A KR101701645B1 KR 101701645 B1 KR101701645 B1 KR 101701645B1 KR 1020150147991 A KR1020150147991 A KR 1020150147991A KR 20150147991 A KR20150147991 A KR 20150147991A KR 101701645 B1 KR101701645 B1 KR 101701645B1
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South Korea
Prior art keywords
steel plate
bending
advancing
hpl
control
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KR1020150147991A
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Korean (ko)
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나두현
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현대제철 주식회사
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
    • B21B37/40—Control of flatness or profile during rolling of strip, sheets or plates using axial shifting of the rolls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
    • B21B37/44—Control of flatness or profile during rolling of strip, sheets or plates using heating, lubricating or water-spray cooling of the product
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2263/00—Shape of product
    • B21B2263/04—Flatness

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Straightening Metal Sheet-Like Bodies (AREA)

Abstract

The present invention relates to an apparatus and method for correcting bending of a steel plate, and more particularly, to a method and apparatus for correcting a bending of a steel plate at a first predetermined position by detecting a bending of the steel plate at a first predetermined position, And the bending information of the steel plate transmitted from the first and second bending sensing parts is compared with a set value to determine whether or not calibration is necessary. When calibration is required, the preliminary calibrator (PPL) and the upper and lower parts of the hot calibrator And a control unit for performing bending correction of the steel plate front end through roll control, ACC cooling, and moving direction control of the steel plate.

Figure R1020150147991

Description

[0001] DESCRIPTION [0002] APPARATUS FOR CORRECTING FRONT-END BENDING OF STEEL PLATE AND METHOD THEREOF [0003]

The present invention relates to a steel plate front end bending correcting apparatus and method, and more particularly, to a steel plate front end bending correcting apparatus and method for performing straightening when a bending occurs at a leading end of a steel plate in a rolling pass, .

Generally, when a thermo mechanically controlled process (TMCP) steel is produced in a rolling mill production line of a steel mill, bending (or skiing) may occur at the tip of the steel plate when the last pass is performed by a rolling path. Therefore, when producing TMCP steel, the last pass was produced without passing through.

BACKGROUND ART [0002] The background art of the present invention is disclosed in Korean Registered Patent No. 10-0388045 (registered on June, 2003, April 2004, apparatus and method for upwardly bending a hot strip at the tip thereof).

According to an aspect of the present invention, there is provided a steel plate front end bending correction apparatus capable of performing a calibration when bending occurs in a tip portion in a rolling pass of a steel plate, when the bending is within an allowable range.

According to another aspect of the present invention, there is provided a method of calibrating a steel plate front end bend, which can perform calibration when a bending occurs at a leading end in a rolling pass of a steel plate, when the bending is within an allowable range.

According to an aspect of the present invention, there is provided a bending correction apparatus for a steel plate front end, comprising: a first bending sensing unit for sensing bending of a front end of a steel plate at a predetermined first position; A second bending sensing unit for sensing bending of a front end of the steel sheet at a predetermined second position; And a controller for comparing the bending information of the steel plate received from the first and second bending sensing parts with a set value to determine whether or not calibration is necessary, and when the calibration is required, the preliminary calibrator (PPL) , An accelerating cooling device (ACC), and a control unit for performing bending correction of a steel plate front end through control of the moving direction of the steel plate.

The present invention may further comprise: a first roll driving unit for raising or lowering the upper roll of the preliminary calibrator (PPL) under the control of the control unit; A second roll driving unit for raising or lowering the upper roll of the hot straightener (HPL) under the control of the control unit; And an accelerator-freezing device (ACC) for shutting off or opening the accelerator-free device (ACC) under the control of the controller to inject cooling water.

In the present invention, the control unit controls the steel plate to advance in the forward direction without correcting the steel plate when the leading end bending of the steel plate discharged from the finishing mill FM is larger than the set value, control to correct the steel plate while advancing it in the reverse direction, The bending of the steel plate front end is corrected by continuously performing the control of correcting the steel plate while advancing it in the forward direction.

In the present invention, the control for advancing the forward direction without calibrating the steel sheet is performed such that the controller raises both the preliminary calibrator (PPL) and the upper roll of the hot calibrator (HPL) In which the stern of the steel sheet discharged from the finishing mill FM passes through the hot straightener (HPL) in a state of being blocked so as not to be injected.

In the present invention, the control for correcting the steel plate while advancing it in the reverse direction increases both the preliminary calibrator (PPL) and the upper roll of the hot calibrator (HPL), and prevents the cooling water from being injected into the steel plate When the stern of the steel plate advancing in the forward direction passes through the hot plate straightener (HPL) in the cut-off state, the control unit controls the steel plate in the state where both the upper straight rollers of the hot straightener (HPL) And the accelerated cooling device (ACC) is opened while passing the cooling water in the reverse direction so that the cooling water is allowed to flow into the steel plate and cooled.

In the present invention, the control for correcting the steel plate while advancing it in the forward direction is performed by passing the steel plate through the reverse direction in the state where both the upper roll of the hot straightener (HPL) and the preliminary straightener (PPL) (HPL) and the preliminary calibrator (PPL), the control unit changes the advancing direction of the steel plate to pass the steel plate in the forward direction while the upper roll of the preliminary calibrating unit And a control unit for performing calibration.

According to another aspect of the present invention, there is provided a method of correcting bending of a steel strip front end, comprising: sensing a front end bending of a steel strip discharged from a first position; And advancing the steel plate in a forward direction without calibrating the steel plate when the detected bending of the steel plate is greater than a set value; When the stern of the steel plate advancing in the forward direction passes through the hot plate straightener (HPL), correcting the steel plate while advancing the steel plate in the reverse direction; And advancing and reversing the advancing direction of the steel plate when the head of the steel plate proceeding in the reverse direction passes through the preliminary calibrator (HPL).

In the present invention, when the controller bends the steel plate forward while changing the forward direction, the control unit corrects the steel plate while advancing the steel plate in the reverse direction when the front end bending of the steel plate discharged at the second position is larger than the set value And the step of correcting the steel plate while advancing and reversing the steel plate forward direction is repeatedly performed until the steel plate edge bending becomes smaller than the set value or repeatedly performed a predetermined number of times.

According to an aspect of the present invention, there is provided an effect that calibration can be performed when bending occurs at the leading end in the rolling pass of a steel sheet, when the bending is within an allowable range.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing a schematic configuration of a steel plate front end bending correction apparatus according to an embodiment of the present invention; FIG.
FIG. 2 is an exemplary view for explaining a step in which the control unit performs the bending correction of the steel plate front end step by step in FIG. 1; FIG.
3 is a flow chart for explaining a bending method of a steel plate front end according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a bending correcting apparatus and method according to the present invention will be described with reference to the accompanying drawings.

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

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view showing a schematic configuration of a steel plate front end bending correcting apparatus according to an embodiment of the present invention; FIG.

1, the steel plate front end bending correction apparatus according to the present embodiment includes a first bending sensing unit 110, a first roll driving unit 120, an accelerated cooling device (ACC) driving unit 130, A roll driving unit 140, a second bending sensing unit 150, and a control unit 160.

The first bending sensing unit 110 senses a leading edge bending (that is, a skew amount) of a steel sheet output from a finishing mill (FM) of a heavy plate rolling production line.

The bending (i.e., skew amount) information of the steel sheet detected by the first bending sensing unit 110 is transmitted to the controller 160.

The control unit 160 determines whether the bending (i.e., skid amount) information of the steel plate received from the first bending sensing unit 110 is larger than the set value (allowable range).

If the bending (i.e., skew amount) information of the detected steel sheet is smaller than the set value (allowable range), the steel sheet may be cooled and moved to a storage position (for example, (I.e., the ski amount) information is larger than the set value (allowable range).

That is, if the bending (i.e., skid amount) information of the detected steel sheet is larger than the set value (allowable range), the preliminary calibrator (PPL) and the hot calibrator (HPL) could not be used.

However, in the present invention, even if the bending (i.e., skew amount) of the detected steel sheet is larger than the set value (allowable range), the controller 160 controls the upper and lower rolls of the preliminary calibrator PPL and the hot- (ACC), the bending of the steel plate front end is corrected by controlling the moving direction of the steel plate (traveling direction). The specific calibration method will be described with reference to Fig.

The first roll driving unit 120 raises or lowers the upper roll of the preliminary calibrator PPL under the control of the controller 160. [

The second roll driving unit 140 raises or lowers the upper roll of the hot straightener (HPL) under the control of the controller 160. [

When the upper roll of the preliminary calibrator (PPL) and the hot calibrator (HPL) is in the lowered state, the bending of the steel sheet passing between the upper roll and the lower roll is corrected.

However, when the bending (skidding amount) of the steel plate upper end portion is larger than the set value (allowable range) as described above, the preliminary calibrator (PPL) and the hot calibrator (HPL) However, in this embodiment, the control unit 160 performs calibration by controlling the upper and lower rolls of the preliminary calibrator PPL and the hot calibrator HPL, the number of revolutions of the accelerating cooling system ACC, and the moving direction of the steel strip To prevent the disposal of waste.

The second bending sensing unit 150 is calibrated by the method according to the present embodiment and senses the leading edge bending (i.e., skew amount) of the steel sheet output from the hot straightener (HPL) again and transmits it to the controller 160, So that the controller 160 can determine whether calibration has been properly performed. If the calibration is not properly performed, the controller 160 may perform re-calibration of the steel plate.

FIG. 2 is an exemplary view for explaining the process of stepwise bending correction of a steel plate front end portion in FIG. 1; FIG.

As shown in FIG. 2 (a), the bending (ie, skew amount) of the leading edge of the steel sheet output (or discharged) from the finishing mill FM is sensed, The control unit 160 raises both the preliminary calibrator PPL and the upper roll of the hot calibrator HPL and the cooling water is fed from the accelerating cooling unit ACC to the steel plate, .

As shown in FIG. 2 (b), in the state in which the upper roll of the preliminary calibrator PPL and the upper roll of the hot-calibrator HPL are both raised and the cooling water is prevented from being injected into the steel plate by the accelerating cooling device ACC, When the stern of the steel plate passes through the HPL as shown in FIG. 2C, the controller 160 controls the upper roll of the HPL and the preliminary calibrator PPL The steel plate is allowed to pass through the steel plate in the reverse direction. At this time, the accelerated cooling device (ACC) is opened to cool the cooling water so that the cooling water is introduced into the steel plate.

This process (i.e., backward correction) significantly corrects the leading edge bending of the steel sheet.

However, in the present embodiment, when the leading edge (i.e., the leading end) of the steel plate that has been reversed as shown in FIG. 2 (d) passes through the preliminary calibrator HPL, (E), the upper roll of the hot straightener (HPL) and the preliminary straightener (PPL) are both lowered, and the direction of advance of the steel plate is changed again so as to pass in the forward direction. At this time, the accelerated cooling device (ACC) blocks cooling water from being injected into the steel plate.

As described above, in the present embodiment, when the leading end bending (i.e., skew amount) of the steel sheet output (or discharged) from the finishing mill FM is larger than the set value (allowable range) (I.e., correcting the steel plate while advancing it in the reverse direction), and performing forward correction (i.e., correcting while advancing the steel plate in the forward direction) of the steel plate by continuously performing the reverse calibration of the steel plate So that it can be corrected. That is, this embodiment makes it possible to calibrate a steel sheet having a skew amount exceeding an allowable range.

3 is a flowchart illustrating a bending method of a steel plate front end according to an embodiment of the present invention.

As shown in FIG. 3, the controller 160 senses the leading edge bending (i.e., the skew amount) of the steel sheet discharged from the first position (i.e., the discharging portion of the finishing mill FM) (S101).

The control unit 160 compares the sensed bending (i.e., skew amount) of the edge of the steel sheet with the set value (allowable range) (S102).

The control unit 160 raises both the preliminary calibrator PPL and the upper roll of the hot calibrator HPL when the detected edge bending of the steel sheet is greater than the set value The apparatus ACC advances (moves) the steel plate in the forward direction (S103) while the cooling water is blocked from being injected into the steel plate.

The stern of the steel plate moved in the forward direction while the upper roll of both the preliminary calibrator PPL and the hot calibrator HPL is elevated and the cooling water is blocked from being injected into the steel plate by the accelerating cooling device ACC, (HPL), the controller 160 opens the accelerated cooling device ACC while passing the steel plate in the reverse direction while the upper rolls of the hot straightener (HPL) and the preliminary straightener (PPL) So that the cooling water is introduced into the steel plate and cooled (S104).

When the leading edge of the steel plate in the reverse direction passes through the preliminary calibrator HPL, the controller 160 changes the proceeding direction of the steel plate so that the preliminary calibrator PPL and the hot calibrator HPL (S105, S106).

At this time, the accelerated cooling device (ACC) is shut off so that cooling water is not injected into the steel plate.

Next, the controller 160 senses the leading edge bending (i.e., the skew amount) of the steel sheet discharged from the second position (i.e., the discharging portion of the hot air aligner) (S107).

Next, the controller 160 compares the tip bending (i.e., skew amount) of the steel sheet discharged from the second position (i.e., the discharge portion of the hot air aligner) to a value smaller than a set value (tolerance range). That is, the controller 160 determines whether the steel plate is properly calibrated according to the present embodiment.

If the calibration is not properly performed (i.e., the ski amount is larger than the set value) (NO in S108), the backward calibration is performed up to the preliminary calibrator PPL (S105) The forward calibration is performed to the hot straightener (HPL) (S106).

The calibration process (S105 to S108) may be repeatedly performed a predetermined number of times.

On the other hand, if the calibration is properly performed (i.e., the ski amount is smaller than the set value) (YES in S108), the controller 160 moves the calibrated steel plate to a storage position (e.g., cooling image) ).

If the bending (i.e., skew amount) information of the steel sheet sensed at the first position is smaller than the set value (NO in S102), calibration is not necessary. Therefore, the steel sheet is cooled by the conventional method, (S110, S109).

As described above, according to the present embodiment, it is possible to correct the steel sheet having a skew amount exceeding the allowable range, thereby improving the steel sheet production yield.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, I will understand the point. Accordingly, the technical scope of the present invention should be defined by the following claims.

110: first bending sensing part
120: first roll driver
130: ACC driver
140: second roll driver
150: second bending sensing unit
160:

Claims (8)

A first bending sensing unit for sensing bending of a front end of the steel sheet at a predetermined first position;
A second bending sensing unit for sensing bending of a front end of the steel sheet at a predetermined second position; And
(B) determining whether or not calibration is necessary by comparing the bending information of the steel plate received from the first and second bending sensing units with the set values; and (c) And a control unit for performing bending correction of the steel plate front end through control of the accelerating cooling system (ACC) and control of the moving direction of the steel plate,
Wherein,
In the case where the leading edge bending of the steel sheet discharged from the finishing mill FM is larger than the set value, control is performed such that the steel sheet is forwarded without correcting, the steel sheet is corrected while advancing in the reverse direction, And the bending of the steel plate is corrected by continuously performing the bending of the steel plate.
The method according to claim 1,
A first roll driving unit for raising or lowering the upper roll of the preliminary calibrator (PPL) under the control of the control unit;
A second roll driving unit for raising or lowering the upper roll of the hot straightener (HPL) under the control of the control unit; And
Further comprising an accelerating device (ACC) for shutting off or opening the accelerating device (ACC) under the control of the control part to inject cooling water into the accelerating device (ACC).
delete The method according to claim 1,
The control for advancing the forward direction without calibrating the steel plate,
The control unit raises both the upper rolls of the preliminary calibrator PPL and the hot calibrator HPL and cuts off the cooling water from the accelerator cooling unit ACC to prevent the cooling water from being injected into the steel strip, Is a control for advancing the stern of the steel plate in the forward direction until the stern of the steel plate passes through the hot straightener (HPL).
The method according to claim 1,
The control for correcting the steel plate while advancing in the reverse direction,
The stern of the steel plate proceeding in the forward direction is lifted up by the hot straightener (PPL) and the upper straight rolls of the hot straightener (HPL) are elevated while the cooling water is prevented from being injected into the steel plate by the accelerating cooling device HPL)
The control unit controls the cooling plate by opening the accelerating cooling unit ACC while passing the steel plate in the reverse direction while the upper rolls of the hot straightener (HPL) and the preliminary straightening unit (PPL) Wherein the bending correcting device is a bending correcting device for a steel plate.
The method according to claim 1,
The control for correcting the steel plate while advancing it in the forward direction,
When the steel plate is reversed and corrected by passing the steel plate in a state where both the upper and lower rollers of the hot straightener (HPL) and the preliminary straightener (PPL) are lowered, when the head of the steel plate advancing in the reverse direction passes through the preliminary straightener (HPL)
Wherein the control unit is a control for correcting the direction of the steel plate by changing the advancing direction of the steel plate in the forward direction while the upper roll of the HPL and the preliminary calibrating unit is continuously lowered.
Detecting a bending of a leading edge of the steel sheet discharged from the first position by the control unit;
And advancing the steel plate in a forward direction without calibrating the steel plate when the detected bending of the steel plate is greater than a set value;
When the stern of the steel plate traveling in the forward direction passes the HPL, the control unit corrects the steel plate while advancing the steel plate in the reverse direction; And
And advancing and reversing the advancing direction of the steel plate when the head of the steel plate in the reverse direction passes through the preliminary calibrator (HPL), and correcting the steel plate front end bending correction method.
[8] The method of claim 7, wherein the control unit corrects the steel plate while advancing the steel plate in the forward direction,
Wherein the control unit corrects the steel plate while advancing the steel plate in the reverse direction when the front end bending of the steel plate discharged from the second position is larger than the set value, And repeating the measurement until the thickness of the steel plate is smaller than the predetermined value or by repeating the measurement for a predetermined number of times.
KR1020150147991A 2015-10-23 2015-10-23 Apparatus for correcting front-end bending of steel plate and method thereof KR101701645B1 (en)

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20010011177A (en) * 1999-07-26 2001-02-15 이구택 Apparatus and method of correcting bending on strip head

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20010011177A (en) * 1999-07-26 2001-02-15 이구택 Apparatus and method of correcting bending on strip head

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