KR101518633B1 - System and method for controlling camber and strip deviation - Google Patents

Abstract

Disclosed are a system and a method to control camber and strip deviation. The system to control camber and strip deviation comprises: a camber and strip deviation measurer arranged in an outlet of a rolling mill to measure the camber and strip deviation of a steel plate passing the rolling mill; a roll force measurer to measure roll force deviation between a drive side (D/S) and a work side (W/S) of the steel plate passing the rolling mill; a camber and strip deviation calculation part to calculate the lateral asymmetry information of the steel plate using the measured value received from the camber and strip deviation measurer; a camber and strip deviation controller to calculate a roll level control amount of the rolling mill to prevent the camber and strip deviation of the steel plate based on the lateral asymmetry information of the steel plate calculated by the strip deviation calculation part and the roll force deviation measured by the roll force measurer; and a gap level controller for a rolling mill to control the roll level of the rolling mill according to the roll level control amount calculated by the camber and strip deviation controller. Thus, the present invention is to prevent the camber and strip deviation of the steel plate caused in a rough rolling process.

Description

TECHNICAL FIELD [0001] The present invention relates to a camber and plate-

The present invention relates to a technique for controlling a camber and a plate tilt, and more particularly, to a technique for controlling a camber and a plate tilt by using a camber and a plate displacement amount information of an iron plate measured at the exit side of a rolling mill and rolling load deviation information by an iron plate entering the rolling mill. And a camber and plate tilt control system and method for controlling movement.

The camber and plate deflection of the steel sheet generated in the hot rolling step of hot rolling is an important factor affecting the ductility and the quality of the steel sheet. The occurrence of excessive camber may cause the steel plate to pinch and bump into the equipment such as the side guide, which may cause accidents of the equipment. The camber and the plate stiffness in the rough rolling cause a plate- The problem of commodity is caused. Further, the camber generated at the tip of the steel sheet causes a telescope shape problem in the coil winding work in the coil winder, thereby causing a reduction in the yield rate and quality problems such as frictional flaws in a subsequent process.

Conventionally, it has been mainly dependent on manual intervention of the operator, that is, the operator manually changing the roll gap level of the rolling mill in order to control the camber and plate spread in such hot rolling line.

Also, in the prior patent documents, there has been proposed a method of controlling the roll level of the rolling mill by measuring the difference between the left and right tensions, and a method of controlling the roll level of the rolling mill when the steel plate passes through the steel plate. However, conventional techniques have limitations in actively controlling the camber and the plate tilt.

US registered patent US 5,172,579 Japanese Patent Application Laid-Open No. 2006-150414

Therefore, in the related art, there is a demand for a method for suppressing camber and plate tilting of a steel sheet generated in a rough rolling process.

In order to solve the above-described problems, one embodiment of the present invention provides a camber and plate-thrust control system. The system comprises: a camber and a plate tester measuring the amount of camber and plate deflection of an iron plate provided on the exit side of the rolling mill and passing through the rolling mill; A roll force meter for measuring a roll force deviation between a D / S (drive side) and a W / S (work side) with respect to the steel plate passing through the rolling mill; A camber and a plate tilt calculation unit for calculating asymmetric information of the steel plate in the width direction by using measured values received from the camber and the plate tilt measuring unit; The roll level control amount of the rolling mill for suppressing the camber and plate tilt of the steel sheet is calculated on the basis of the widthwise asymmetry information of the steel sheet calculated by the plate spread calculation unit and the roll force deviation measured by the roll force meter Camber and plate tilt controller; And a rolling mill gap level controller for controlling the roll level of the rolling mill according to the roll level control amount calculated by the camber and the plate centering controller.

The camber and arm displacement measuring instrument includes an odd-numbered pass camber and a plate tester measuring an amount of camber and plate deflection of the steel plate on the side of an even-numbered pass rolling machine; And an even pass camber and a plate tilt measuring device for measuring the camber and plate deflection amount of the steel plate at the exit side of the even-numbered rolling mill.

The camber and plate tilt calculation unit calculates the camber

및

는 각각 OC_(i+1) 및 CD_i의 가중치를 나타내는 필터 계수를 의미한다.According to which to calculate the width direction of the asymmetric information, LD _{(i + 1)} is the (i + 1) th widthwise asymmetry information of the path, OC _{(i + 1)} is (i + 1) plate displacement amount of the second pass, , CD _i is the camber variation of the i-th pass, and

And

_{(I + 1)} and OC Means a filter coefficient indicating the weight of CD _i .

The camber and plate-to-plate controller may be implemented by the following equation

_{(I + 1)} is the roll level control amount of the rolling mill of the (i + 1) th pass, and RD _{(i + 1)} is the roll level control amount of the rolling mill of the The roll force deviation between / S and W / S, and G ₁ and G ₂ denote the control gain for LD _{(i + 1)} and RD _{(i + 1)} , respectively.

In order to solve the above-described problems, another embodiment of the present invention provides a camber and plate tilt control method. The method includes calculating an asymmetry of a steel plate using a rolling-out camber amount measured in a previous pass; Calculating and outputting a roll level control amount of the rolling mill if the asymmetry of the iron plate is greater than a preset threshold value; Measuring a plate deflection amount and a roll force deviation of the iron plate in a current path; And calculating a roll level control amount of the rolling mill in consideration of the plate deflection amount and the roll force deviation.

In addition, the means for solving the above-mentioned problems are not all enumerating the features of the present invention. The various features of the present invention and the advantages and effects thereof will be more fully understood by reference to the following specific embodiments.

Provided is a camber and plate tilt control system and method for controlling the camber and width direction movement of a steel plate by using camber and plate displacement amount information of the steel plate measured from the side of the rolling mill and rolling load deviation information by the steel plate entering the rolling mill .

1 is a configuration diagram of a camber and plate tilt control system according to an embodiment of the present invention;
FIG. 2 is a view showing longitudinal camber information of an iron plate measured according to an embodiment of the present invention, and FIG.
3 is a flow chart of a camber and plate tilt control method according to another embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, in order that those skilled in the art can easily carry out the present invention. In the following detailed description of the preferred embodiments of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. In the drawings, like reference numerals are used throughout the drawings.

In addition, in the entire specification, when a part is referred to as being 'connected' to another part, it may be referred to as 'indirectly connected' not only with 'directly connected' . Also, to "include" an element means that it may include other elements, rather than excluding other elements, unless specifically stated otherwise.

1 is a configuration diagram of a camber and plate tilt control system according to an embodiment of the present invention.

Referring to FIG. 1, a camber and plate steer control system 100 according to an embodiment of the present invention includes odd-numbered pass and even-numbered pass camber and plate-spread meters 111 and 112, a roll force meter 120, A camber and plate-spreading controller 140, and a rolling gap level controller 150. The roll-gap-level controller 150 controls the roll-

The odd-numbered path and the even-numbered path camber and the plate tilt measuring devices 111 and 112 are provided on the exit side of the rolling mill to measure the camber and plate deflection amount of the steel plate 1 passing through the rolling mill. Here, the camber means the extent to which the steel plate 1 is bent, and the amount of plate deflection means the movement of the steel plate 1 in the width direction.

Particularly, the odd-numbered path camber and the plate tilt measuring device 111 measure the camber and plate deflection amount of the steel plate 1 at the exit side of the odd-numbered pass, and the even-numbered path camber and the plate tilt measuring device 112 measure the even- The amount of camber and plate deflection of the steel plate 1 is measured.

The odd-numbered path and the even-numbered path camber and the plate tilt measuring devices 111 and 112 can be implemented by a plurality of image measuring instruments capable of measuring camber and plate deflection.

The roll force gauge 120 measures the roll force deviation between the D / S (drive side) and the W / S (work side), that is, the rolling load deviation, with respect to the steel plate 1 passing through the rolling mill 2.

The camber and plate tilt calculation unit 130 calculates the widthwise asymmetry information of the steel plate 1 using the measured values received from the odd-numbered path and the even-numbered path camber and the plate tilt measuring units 111 and 112.

Specifically, the camber and plate tilt calculation unit 130 can calculate the widthwise asymmetry information of the steel plate 1 according to Equation (1).

Here, LD _{(i + 1)} means widthwise asymmetry information of the (i + 1) th path and OC _{(i + 1)} means Offcenter Value ) means, and CD _i mean camber change amount of the i-th path (camber Deviation). CD ₀ is calculated by using the last pass camber amount information of the previous coil when the previous coil and the current coil are similar to each other in the same lot. If another steel grade comes in, CD ₀ is substituted with 0 assuming that there is no camber.

및

는 각각 철판(1)의 폭 방향 비대칭 정보를 계산하는데 있어서 OC_(i+1) 및 CD_i의 가중치를 나타내는 필터 계수이다.Also,

And

OC _{(i + 1)} and OC _{(i + 1)} in calculating the widthwise asymmetry information of the steel plate _1, Is a filter coefficient indicating the weight of CD _i .

The amount of the camber can be measured only when the entire lengthwise direction of the steel plate 1 passes through the camber and the plate tilt measuring instrument. (I + 1) -th path in the width direction of the steel plate 1 by using the camber change amount CD _i of the i-th path and the plate displacement amount OC _{(i + 1)} LD _{(i + 1)} which is asymmetric information is calculated. In other words, the signals measured in the previous pass using the odd-numbered path and the even-numbered path camber and the plate tilt measurer 111, 112 are used to calculate the camber amount, and the amount of plate deflection is measured in the current path. Further, since the leading end of the previous path becomes the leading end of the current path, the amount of camber change can be calculated using the amount of camber measured at the leading end, that is, at the outgoing end, and the amount of plate deflection measured at the entrance or exit of the rolling mill can be used .

The camber and plate displacement controller 140 calculates the difference between the widthwise asymmetry information of the steel plate 1 calculated by the camber and plate tilt calculation unit 130 and the D / S and W / S measured by the roll force meter 120 The roll level control amount of the rolling mill for suppressing plate misalignment of the steel plate 1 is calculated based on the roll force deviation of the roll. The camber and plate-tilt controller 140 can calculate the roll level control amount of the rolling mill in real time according to Equation (2).

Here, CO _{(i + 1)} means the roll level control output of the rolling mill of the (i + 1) th pass, RD _{(i + 1)} / S (Roll Force Deviation).

G ₁ and G ₂ are control gains for the roll force deviation and the widthwise asymmetry information of the steel plate 1, respectively.

The roll gap level controller 150 controls the roll level of the rolling mill 2 in accordance with the roll level control amount calculated by the camber and plate steepness controller 140 so that the camber and plate deviation of the steel strip 1 are suppressed.

2 is a view showing longitudinal camber information of an iron plate measured according to an embodiment of the present invention.

Referring to FIG. 2, asymmetric information about a certain length (for example, w) of the front side of the steel plate that greatly affects the rolling machine girder can be calculated from the longitudinal camber information of the steel plate.

To this end, an asymmetric information of the iron plate is derived from the average slope information for n positions between 0 and w and the area information for the camber amount according to Equation (3) . Here, the degree of warping of the iron plate can be grasped by using the slope information, and the area information can be used to calculate the degree of plate deflection.

및

는 각각 평균 기울기 정보와 캠버량에 대한 면적 정보의 가중치를 나타내는 필터 계수이다.
Here, p means the pth pass of the rolling mill,

And

Is a filter coefficient indicating the weight of the area information on the average slope information and the camber amount, respectively.

3 is a flow chart of a camber and plate tilt control method according to another embodiment of the present invention.

Referring to FIG. 3, first, the rolling-out camber amount of the previous pass is measured (S30), and the asymmetry of the steel plate is calculated using the measured camber amount (S31).

The calculated asymmetry is compared with a predetermined threshold value a (S32). If the calculated asymmetry is larger than the threshold value, the roll level control amount of the rolling mill is calculated and output (S33, S34). On the other hand, if it is not larger than the threshold value, the current path is passed.

Thereafter, the plate displacement amount in the current path is measured (S35), and asymmetry information of the width direction of the steel plate is calculated (S36). Further, after measuring the roll force deviation in the present pass (S37), the roll level control amount of the rolling mill is calculated (S38).

Then, the roll level control amount of the rolling mill calculated in consideration of the plate displacement amount and the roll force deviation is outputted to the gap level controller of the rolling mill to control the roll level control (S39).

Thereafter, when a change occurs in the camber and plate deflection amount (S40), the process returns to step S35 to control the roll roll level.

The above procedure is repeated until the camber is below a certain level or until there is no change in the amount of plate deflection.

A concrete method of calculating the asymmetry of the steel plate and the roll level control amount of the rolling mill is as described above with reference to FIG. 1, and thus a detailed description thereof will be omitted.

According to the embodiment of the present invention described above, the width direction movement of the steel plate is restrained by using the camber and plate displacement amount information of the steel plate measured at the side of the rolling mill and the rolling load deviation information by the steel plate entering the rolling mill, It is possible to improve the running property and to carry out stable rolling. Further, it is possible to improve the throughput of the hot rolling line, thereby lowering the error rate and improving the operating error rate.

The present invention is not limited to the above-described embodiments and the accompanying drawings. It will be apparent to those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

1: iron plate
2: rolling mill
100: Camber and plate tilt control system
111: odd-numbered path camber and plate tester
112: Even path camber and plate tilt measuring instrument
120: Roll force meter
130: camber and plate tilt calculation unit
140: camber and plate tilt controller
150: Rolling machine gap level controller

Claims (5)

A camber and a plate tester measuring the amount of camber and plate deflection of the steel plate provided on the exit side of the rolling machine and passing through the rolling machine;
A roll force meter for measuring a roll force deviation between a D / S (drive side) and a W / S (work side) with respect to the steel plate passing through the rolling mill;
A camber and a plate tilt calculation unit for calculating asymmetric information of the steel plate in the width direction by using measured values received from the camber and the plate tilt measuring unit;
The roll level control amount of the rolling mill for suppressing the camber and plate tilt of the steel sheet is calculated on the basis of the widthwise asymmetry information of the steel sheet calculated by the plate spread calculation unit and the roll force deviation measured by the roll force meter Camber and plate tilt controller; And
A roll gap level controller for controlling the roll level of the rolling mill in accordance with the roll level control amount calculated by the camber and the plate-
The camber and arm-
An odd-numbered path camber and a plate tilt measuring device for measuring the camber and plate deflection amount of the steel plate from the side of the rolling mill of an odd-numbered path; And
A camber and plate tilt control system including an even pass camber and a plate tilt measuring device for measuring a camber and a plate deflection amount of the steel plate from an output side of an even pass.
delete 2. The apparatus according to claim 1, wherein the camber and plate tangent calculation unit calculates the following equation

Calculates the widthwise asymmetry information according to the widthwise asymmetry information,
LD _{(i + 1)} is the (i + 1) th widthwise asymmetry information of the path, OC _{(i + 1)} is (i + 1) plate displacement amount of the second pass, CD _i is the camber change amount of the i-th path, and

And

_{(I + 1)} and OC A camber and plate tilt control system, which means a filter coefficient representing the weight of CD _i .
4. The apparatus of claim 3, wherein the camber and plate-

Calculates a roll level control amount of the rolling mill in accordance with the roll level control amount,
_{(I + 1)} is the roll-level control amount of the rolling machine of the (i + 1) th pass, RD _{(i + 1)} is the roll force deviation between D / S and W / S of the G ₁ and G ₂ denote the control gains for LD _{(i + 1)} and RD _{(i + 1)} , respectively.
Calculating an asymmetry of the steel plate using the rolling camber amount measured in the previous pass;
Calculating and outputting a roll level control amount of the rolling mill if the asymmetry of the iron plate is greater than a preset threshold value;
Measuring a plate deflection amount and a roll force deviation of the iron plate in a current path; And
And calculating a roll level control amount of the rolling mill in consideration of the plate displacement amount and the roll force deviation,
The roll level control amount of the rolling mill,
In the camber and plate tilt controller, the following equation

A method for controlling camber and plate tilt by using the method of claim 1.
Here, CO _{(i + 1)} is the roll level control amount of the rolling mill of the (i + 1) th pass, RD _{(i + 1)} is the roll force deviation between D / S and W / S of the , And G ₁ and G ₂ denote control gains for LD _{(i + 1)} and RD _{(i + 1)} , respectively.

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