KR20130071657A - Apparatus and method for controling roll skew - Google Patents

Abstract

PURPOSE: A roll skew control device and a method thereof are provided to facilitate the precise measurement of roll skew value and to minimize a camber by minimizing an effect by the foreign materials around a sensor. CONSTITUTION: A roll skew control device includes first and second metal bars, an eddy-current sensing part (40), and a control part (50). First and second metal bars are adhered to one side of roll chock (16) to which upper and lower work rolls (12,13) are coupled. The eddy-current sensing part measures the distance from the fixed location to the first and second metal bars. The control part determines the rolls skew based on the distance variation information which is sent from the eddy current sensing part, and controls the alignment of work roll based on the resulted roll skew value. [Reference numerals] (AA) Inlet side; (BB) Outlet side

Description

[0001] APPARATUS AND METHOD FOR CONTROLLING ROLL SKEW [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roll skew control device and a method thereof, and more particularly, to a roll skew control device and method for measuring and controlling a skew of upper and lower work rolls generated in a rolling process.

Generally, the problem of ductility of a rolled material, particularly a rear plate having a predetermined thickness, is caused by camber generation due to asymmetric rolling of the rear plate, and by the occurrence of camber on the front and rear ends of the rolled material due to the asymmetric rolling Lt; / RTI >

As described above, the rolled material in which the camber or warp occurs causes a problem in the throughput, resulting in a decrease in the quality of the product, an error rate, and a decrease in the productivity of production. Therefore, in order to maintain or improve the rolling quality, camber occurrence should be suppressed as much as possible.

Conventionally, as a technique for preventing such a camber, a control method based on a camber prediction model, a dynamic control method using a difference load, a facility influence factor measurement method and the like have been used.

Japanese Laid-Open Patent Application No. 2011-104608 introduces a supplementary method of controlling such camber generation.

The present invention relates to a method of controlling a camber by sticking a shim for regulating an interval between a roll choke and a housing window to an operation side of a reinforcing roll and an ejecting direction of a driving side to prevent roll alignment from being distorted.

Korean Patent Laid-Open Publication No. 2010-0116660 relates to a "plate rolling machine and a plate rolling method", in which equipment for adding a substantially horizontal external force to a work roll is provided without depending on an offset force in the rolling direction, (Working side, driving side) of the rolling mill generated during the rolling of the rolling mill, problems such as plate warping, meandering due to the thrust force generated between the work rolls or the reinforcing rolls, problems such as camber .

Japanese Patent Application Laid-Open No. 2007-190579 discloses a rolling direction force acting on the working side and the driving side roll chock of the offset work roll, when rolling the work roll and the reinforcing roll using a rolling machine, that is, Discloses a method of measuring a component force to calculate a difference between a work side and a drive side of the offset component and controlling left and right asymmetric components of the roll opening degree of the rolling mill on the basis of the difference.

However, these prior arts have a limitation in providing basic information that can measure the actual roll skew information and correct the alignment state of the roll, since it does not actually measure the actual skew value of the work roll.

It should be understood that the foregoing description of the background art is merely for the purpose of promoting an understanding of the background of the present invention and is not to be construed as adhering to the prior art already known to those skilled in the art.

: Published Japanese Patent Application No. 2011-104608 (Published on June 2, 2011) : Korean Patent Publication No. 2010-0116660 (published on November 11, 2010) : Japanese Patent Publication No. 2007-190579 (published on Aug. 2, 2007)

The present invention provides a roll skew control device and method that can prevent a camber caused by a difference in elongation between one side and another side of a rolling mill by controlling a roll skew, which is one of factors that cause camber.

In order to achieve the above object, a roll skew control device according to the present invention includes: a pair of first metal bars respectively attached to one side of a roll choke to which one end of a work roll is coupled; A pair of second metal bars respectively attached to one side of the roll chocks to which the other ends of the upper and lower work rolls are coupled; An eddy current sensor unit for measuring a distance between the first and second metal bars at a fixed position; And a control unit for determining the roll skew based on the distance change amount information received from the eddy current sensor unit.

And an indicator for outputting a sensing signal of the eddy current sensor unit as an analog signal, wherein the controller digitizes the analog signal output from the indicator and converts the analog signal into a distance variation amount.

The roll skew control device of the present invention further includes a skew adjusting unit that receives the angle control command of the upper and lower work rolls from the control unit and corrects roll skew.

The roll skew is fixedly installed on the frame, and the moving mechanism for moving the eddy current sensor part is mounted on the frame so as to avoid interference between the eddy current sensor part and the roll choke when the upper and lower work rolls are replaced. do.

The control unit calculates the skew angle of the upper and lower work rolls using the following equation.

? = tan ^-1 (2 x DELTA X / s)

(ΔX: difference between the first distance change amount and the second distance change amount, s: distance between the first metal bar and the second metal bar)

In order to achieve the above object, a roll skew control method according to the present invention is a roll skew control method for calculating an amount of distance change and measuring a roll skew value by measuring an initial position and a later position of both ends of a work roll in a non- .

The roll skew control method of the present invention includes: a measuring step of measuring a moving distance of both ends of the work roll at a fixed position; A measuring process of calculating a distance variation based on an initial position and a moving distance of both ends of the work roll; And calculating a roll skew value of the work roll as an angle value based on the alignment state when the work roll is in an unaligned state.

The present invention further includes a control process of returning the work roll in an unaligned state to an aligned state.

The roll skew value calculation process is derived using the following equation.

? = tan ^-1 (2 x DELTA X / s)

(ΔX: difference between the first distance change amount and the second distance change amount, s: distance between the first metal bar and the second metal bar)

According to the present invention, various effects can be obtained as follows.

First, the roll skew value can be precisely measured, and the influence of foreign matters around the sensor can be minimized, and roll skew and camber can be minimized.

Second, there is an advantage that the decrease in productivity due to a large-scale facility accident caused by a sudden camber or a line stop can be minimized.

Third, there is an advantage that the scrap processing of the material due to the excessive camber can be minimized, the width due to the capper can be insufficient, and the thickness defect can be prevented.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a side view of a roll skew control device of the present invention,
FIG. 2 is a view of the roll skew control and the left side of the present invention viewed from the other side,
Fig. 3 shows the installation state of a metal bar, which is a part of the present invention.
4 is a view for explaining a change in position of a metal bar installed on one side and a change in roll skew angle value in the case where a roll skew is generated in the present invention.
5 is a diagram for calculating an angle from a roll skew in the present invention.
6 is a diagram illustrating a state in which an eddy current sensor is moved in a zero point position and a home position in the present invention,
7 is a flowchart of a roll skew control method of the present invention.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments according to the technical idea of the roll skew control device of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a view of a roll skew control device of the present invention viewed from one side, and FIG. 2 is a view of the roll skew control left side of the present invention viewed from the other side.

1 and 2, one side and the other side of the roll skew control device may be divided into a work side 10 and a drive side 20 of a pair cross-rolling machine, respectively.

The work side WS and the drive side DS are respectively provided with upper work rolls 12 and 22 and lower work rolls 13 and 23 installed on the upper and lower portions of the rolling mill frames 11 and 21, The upper backup rolls 14 and 24 that are in contact with the outer periphery of the rolls 12 and 22 and the upper backup rolls 14 and 24 that are in contact with the outer periphery of the lower working rolls 13 and 23, , 25).

 Further, both ends of the upper and lower work rolls 12, 13, 22 and 23, that is, the upper and lower work rolls 12, 13, 22 and 23 are mounted on the rolling mill frames 11 and 21 And is rotatably mounted on the roll chocks 16 and 26. [

On the other hand, when the shape of the tip end crop is asymmetric, the upper and lower work rolls 12, 13, 22 and 23 move in the rolling direction by the impact force when the rolling material 1 is inserted into the rolling mill, A roll skew is generated when the work side WS and the drive side DS are not the same. In this way, the amount of movement in the rolling direction between the work side WS and the drive side DS is different, , The rolling material 1 meanders to the side of the rolling machine (driving side, working side) to generate a camber. In the case of hot rolling, twisting of the tail or rolling of the heavy plate causes a serious mis-roll or malfunction.

The present invention relates to a method for measuring and controlling skew information of upper and lower work rolls (12, 13, 22, 23) A pair of second metal bars 33 and 34 provided on the roll chocks 26 of the drive side DS and a position change amount of the metal bars 31, And a control unit 50 for determining the roll skew of the work side WS and the drive side DS on the basis of the signal measured by the eddy current sensor unit 40 .

3, the first metal bars 31 and 32 are provided on the side surfaces of the roll chocks 16 for supporting the upper and lower work rolls 12 and 13 on the work side WS, respectively, The two metal bars 33 and 34 are provided on the side surfaces of the roll chocks 26 supporting the upper and lower work rolls 22 and 23 of the drive side DS, respectively.

The first and second metal bars 31, 32, 33, and 34 are formed of an electrically conductive material and have a length of about 100 mm in consideration of a vertical moving distance for controlling the thickness of the roll chocks 16 and 26 And the change in thickness is made to be 10 microns.

The eddy current sensor unit 40 is an eddy current sensor capable of measuring a change in distance between the first and second metal bars 31, 32, 33, and 34 so as not to be affected by foreign substances such as oil, dust, Type non-contact type sensor.

The eddy current sensor unit 40 detects the position of the first and second metal bars 31, 32, 33, and 34 so as to measure the positional information of the first and second metal bars 31, And four sensors 41, 42, 43, and 44 for measuring the amount of change, respectively.

The four sensors 41, 42, 43, and 44 each have a maximum distance of 10 mm between the sensor headers and the corresponding first and second metal bars 31, 32, 33, and 34, As shown in FIG. It is preferable to use a sensor head having a diameter of 10 mm or less.

The signals measured by the four sensors 41, 42, 43 and 44 are outputted to the control unit 50 through the indicator 45 and the control unit 50 controls the operation rolls 12, , 23 are determined.

The control unit 50 calculates the roll skew using the signals measured by the four sensors. That is, as shown in FIG. 4 (a), when the alignment of the rolls is changed from the initial state (zero position, S1) to the S2 state during rolling, the first metal bars 31 and A distance change occurs between the sensors 41. [

That is, the first distance variation amount DELTA Xws of the working side WS is calculated by the equation (1) and the second distance variation amount DELTA Xds of the driving side DS is calculated by the equation (2).

 [Equation 1]

Xws = Xws1 - Xws0

 &Quot; (2) "

Xds = Xds1 - Xds0

The difference value DELTA X between the distance variation amounts of the work side WS and the driving side DS is calculated by the equation (2).

 &Quot; (3) "

DELTA X = (DELTA Xws - DELTA Xds) / 2

Since the calculated difference in the amount of distance variation ΔX is not zero, there is no change in the alignment of the work rolls 12 and 22 or there is a parallel movement. Therefore, the control unit 50 is directly related to the camber occurrence It is judged to be small.

If the difference value DELTA X of the distance variation amount is larger than a predetermined reference value (for example, 0.01 mm), the control unit 50 determines that skew has occurred.

4A, when the roll alignment is changed, the distance between the sensor 41 and the metal bar 31 is shorter than the zero point in the case of the work side WS, so that Xws1 < Xws0 is established On the other hand, since the distance between the sensor 43 and the metal bar 33 is further increased on the drive side DS, Xds1 > Xds0 is established. Therefore, the sign of DELTA Xws becomes negative, and the sign of DELTA Xds becomes positive, so the value of DELTA X is negative according to the equation 3. [ On the contrary, when the alignment of the work rolls is changed as shown in FIG. 4B, the value of DELTA X becomes positive. In this way, the controller 50 can predict the shape and size of the skew through the sign and the size of DELTA X.

4 and 5, the angle? Of the roll skew can be determined by the following equation (4).

 &Quot; (4) &quot;

? = tan ^-1 (2 x DELTA X / s)

Here, s means the distance between the work side (WS) metal bar 31 and the drive side (DS) metal bar 33 as shown in Fig.

On the other hand, the angle? Of the roll skew calculated by the controller 50 is transmitted to the skew adjusting unit 60 for adjusting the roll skew, and the skew adjusting unit 60 adjusts the roll skew Is returned to the original state.

6 is a view showing a state in which the eddy current sensor of this embodiment is moved in the zero position and the home position.

The eddy current sensor unit 40 of this embodiment can be installed so as to be movable from the zero position to the home position so as not to interfere with the rolls when the work rolls 12, 13, 22, and 23 are replaced.

For this purpose, a moving tool 70 for moving the eddy current sensor unit 40 in the forward and backward directions can be provided on the frames 10 and 20.

The moving tool 70 is not limited to the components as long as it is a known structure capable of moving the sensor unit 40 in the forward and backward directions. That is, a structure using a common gear can be adopted.

On the other hand, the roll skew control method of the present invention controls the alignment state of the work rolls by calculating the distance change amount and deriving the roll skew value by measuring the initial position and the later position of both ends of the work roll in a noncontact manner.

As shown in Fig. 7, such a roll skew control method includes a measuring process of measuring the moving distance of both ends of the work roll at a fixed position, calculating a distance variation based on the initial position and moving distance of both ends of the working roll And a roll skew value calculating step of calculating a roll skew value of the work roll as an angle value based on the alignment state when the work roll is in an unaligned state, And a control process of returning the rolls to an aligned state.

A specific description of each process is replaced with a description of the roll skew control device described above.

The foregoing has shown and described specific embodiments. It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention as defined in the appended claims.

WS: work side, DS: drive side
11, 21: frame, 12, 22: upper work roll,
13, 23: lower work roll, 16, 26: roll choke,
31, 32, 33, 34: metal bar 40: eddy current sensor unit
50: control unit 60: roll skew adjusting device
70: Moving sphere.

Claims (9)

A pair of first metal bars respectively attached to one side of a roll choke to which one end of the upper and lower work rolls are coupled;
A pair of second metal bars respectively attached to one side of the roll chocks to which the other ends of the upper and lower work rolls are coupled;
An eddy current sensor unit for measuring a distance between the first and second metal bars at a fixed position; And
And a control unit for determining a roll skew based on the distance variation information received from the eddy current sensor unit.
The method according to claim 1,
Further comprising an indicator for outputting a sensing signal of the eddy current sensor unit as an analog signal, wherein the control unit digitizes the analog signal output from the indicator and converts the analog signal into a distance variation amount.
The method according to claim 1,
Further comprising a skew adjusting unit for receiving the angle control command of the upper and lower work rolls from the controller to correct the roll skew.
The method according to claim 1,
The roll skew is fixedly mounted to the frame, and the moving mechanism for moving the eddy current sensor part is mounted on the frame so as to avoid interference between the eddy current sensor part and the roll choke when the upper and lower work rolls are replaced. Roll skew controller.
The method according to claim 2,
Characterized in that the control unit calculates the skew angle of the upper and lower work rolls by using the following equation (1)
? = tan ^-1 (2 x DELTA X / s)
(ΔX: difference between the first distance change amount and the second distance change amount, s: distance between the first metal bar and the second metal bar)
A roll skew control method for controlling the alignment state of the work roll by calculating the distance change amount and deriving a roll skew value by measuring the initial position and the later position of both ends of the work roll in a non-contact manner.
The method of claim 6,
A measuring step of measuring a moving distance of both ends of the work roll at a fixed position;
A measuring process of calculating a distance variation based on an initial position and a moving distance of both ends of the work roll; And
And calculating a roll skew value of the work roll as an angle value based on the alignment state when the work roll is in an unaligned state.
The method of claim 7,
Further comprising a control step of returning the work roll in an unaligned state to an aligned state.
The method of claim 7, wherein the roll skew value calculation process,
Is derived using the following equation (1). &Quot; (1) &quot;
? = tan ^-1 (2 x DELTA X / s)
(ΔX: difference between the first distance change amount and the second distance change amount, s: distance between the first metal bar and the second metal bar)

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