KR20040092121A - An method for controlling a roll gap of rolling mills - Google Patents

An method for controlling a roll gap of rolling mills Download PDF

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KR20040092121A
KR20040092121A KR1020030026319A KR20030026319A KR20040092121A KR 20040092121 A KR20040092121 A KR 20040092121A KR 1020030026319 A KR1020030026319 A KR 1020030026319A KR 20030026319 A KR20030026319 A KR 20030026319A KR 20040092121 A KR20040092121 A KR 20040092121A
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South Korea
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deviation
thickness
roll
steel sheet
gap
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KR1020030026319A
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Korean (ko)
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KR100951270B1 (en
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우충현
박인석
이상택
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주식회사 포스코
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/18—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast
    • H04N7/181—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast for receiving images from a plurality of remote sources
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/10—Small scale networks; Flat hierarchical networks
    • H04W84/12—WLAN [Wireless Local Area Networks]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices
    • H04W88/085—Access point devices with remote components

Abstract

PURPOSE: To provide a method for controlling roll gap of rolling mill to prevent deflection and thickness deviation of strip by correcting a gap between left and right parts of rolls according to roll force deviation at the left and right parts of the rolls. CONSTITUTION: The method comprises a step of setting desired thickness (A) of strip; a step of detecting roll forces (B,C) applied to left and right parts of rolls; a step of summing up the detected left and right roll forces (B,C); a step of converting the total roll force into strip thickness corresponding to the total roll force by averaging the summed up total roll force (D), and operating a thickness deviation (G) between the converted strip thickness (F) and a set strip thickness (A); a step of setting the summed up thickness as first strip thickness (H) by summing up the strip thickness and the thickness deviation; a step of respectively detecting variation of the left and right roll forces per time if strip is led in between the rolls, calculating variation of accumulated values (I,J) of the left and right roll forces by accumulating the detected variation of the left and right roll forces per time and operating a deviation on accumulated value(K) between the calculated variation on accumulated values of the left and right roll forces; a step of converting the variation on accumulated values of the left and right roll forces into left and right deviation thicknesses (L,M) corresponding to the variation on accumulated values of the left and right roll forces if the deviation on accumulated value is the same as or more than a set deviation allowable value on accumulated value and outputting zero (0) as the left and right deviation thicknesses if the deviation on accumulated value is less than the set deviation allowable value on accumulated value; a step of setting the summed up value as a left side roll gap by summing up the left deviation thickness (L) to the first strip thickness and setting the summed up value as a right side roll gap by summing up the right deviation thickness (M) to the first strip thickness; and a step of controlling left and right roll gaps of the rolls by driving left and right cylinders as much as the left and right side roll gaps.

Description

압연기의 롤 갭 제어방법{AN METHOD FOR CONTROLLING A ROLL GAP OF ROLLING MILLS}Roll gap control method of rolling mill {AN METHOD FOR CONTROLLING A ROLL GAP OF ROLLING MILLS}

본 발명은 압연 공정에서 압연기의 롤 갭(Gap)을 제어하는 방법에 관한 것으로, 보다 상세하게는 강판의 판 쏠림 및 두께편차를 방지하기 위해서, 상기 롤의 좌, 우 압하력의 편차에 따라 좌, 우 롤 갭(Gap)을 다르게 제어하는 압연기의 롤갭 제어방법에 관한 것이다.The present invention relates to a method of controlling a roll gap (gap) of a rolling mill in a rolling process, and more particularly, in order to prevent plate deflection and thickness deviation of the steel sheet, the left and the right according to the deviation of the right rolling force In addition, the present invention relates to a roll gap control method of a rolling mill for differently controlling a right roll gap (Gap).

도1은 일반적인 압연 공정의 구성도로서, 강판(1)의 진행방향으로 다수의 압연기가 설치되어 있어서, 상기 강판(1)은 여러 차례 압연된다. 상기 압연기의 롤(2) 갭(Gap)에 따라 강판의 두께가 결정되므로, 제어기(50)는 원하는 강판의 두께에 따라 롤간의 갭(Gap)을 조절한다.1 is a configuration diagram of a general rolling process, in which a plurality of rolling machines are provided in the advancing direction of the steel sheet 1, and the steel sheet 1 is rolled several times. Since the thickness of the steel sheet is determined according to the gap Gap of the roll 2 of the rolling mill, the controller 50 adjusts the gap Gap between the rolls according to the thickness of the desired steel sheet.

도2는 종래 롤 갭 제어장치의 구성도이다. 도2를 참조하여 종래 강판 두께 제어과정을 설명한다. 압연기의 롤(2) 사이로 강판(1)이 취입되면 롤은 압하력을 받고, 롤에 작용하는 압하력은 좌, 우 압하력검출기(5,6)에 의해 검출된다. 제어부(50)는 좌, 우 압하력검출기(5,6)의 좌, 우 압하력(B,C)을 제1합산기(10)에서 합산한 뒤 평균압하력으로 연산하고, 연산된 평균압하력은 신호변환기(9)를 거쳐 그에 상응하는 강판두께(F)로 환산된다. 운전자는 제조하고자 하는 강판두께(A)를 강판두께설정기(7)에 설정하는데, 상기 제1감산기(11)는 상기 설정된 강판두께(A)와 평균압하력에 의해 환산된 강판두께(F)간의 두께편차(G)를 연산한다. 상기 제2합산기(12)는 상기 강판두께설정기(7)의 강판두께(A)에 상기 감산기(11)의 두께편차(G)를 합산하여 상기 롤의 좌, 우에 설치된 좌, 우 실린더(3,4)로 출력하고, 상기 실린더(3,4)는 제2합산기(12)의 강판두께(H)와 상기 연산기의 롤 갭(Gap)이 같아지도록 롤의 좌, 우 롤 갭을 동일하게 제어한다.2 is a block diagram of a conventional roll gap controller. Referring to Figure 2 will be described a conventional steel sheet thickness control process. When the steel sheet 1 is blown in between the rolls 2 of the rolling mill, the roll receives a reduction force, and the reduction force acting on the roll is detected by the left and right reduction force detectors 5 and 6. The controller 50 adds the left and right pressure reduction forces B and C of the left and right pressure reduction force detectors 5 and 6 in the first summer 10 and calculates the average pressure reduction force. The force is converted into a steel plate thickness F corresponding thereto via the signal converter 9. The driver sets the steel sheet thickness A to be manufactured in the steel sheet thickness setter 7, and the first subtractor 11 converts the steel sheet thickness F converted by the set steel sheet thickness A and the average pressure reduction force. Calculate the thickness deviation (G) of the liver. The second summer 12 adds the thickness difference G of the subtractor 11 to the steel sheet thickness A of the steel sheet thickness setter 7 to install left and right cylinders on the left and right sides of the roll ( 3 and 4, and the cylinders 3 and 4 have the same left and right roll gaps of the rolls so that the steel sheet thickness H of the second summer 12 is equal to the roll gaps of the calculators. Control.

상기와 같이, 종래 압연기의 좌, 우 롤 갭(Gap)은 평균압하력에 의해 동일하게 제어된다. 그러나, 롤의 좌, 우에 미세한 온도 편차가 발생되면, 강판의 좌, 우 압연속도가 달라져서 상기 롤의 좌, 우에 작용하는 압하력에 편차가 발생된다. 따라서, 상기 압연기의 좌, 우 롤 갭(Gap)이 동일하더라도 압하력에 편차가 발생되면 강판이 어느 한 쪽으로 쏠리게 되어 강판의 두께에도 편차가 발생된다.As described above, the left and right roll gaps Gap of the conventional rolling mill are equally controlled by the average pressure reduction force. However, when a slight temperature deviation occurs at the left and right sides of the roll, the left and right rolling speeds of the steel sheet are changed to cause deviations in the pressing force acting on the left and right sides of the roll. Therefore, even if the left and right roll gaps (Gap) of the rolling mill is the same, if a deviation occurs in the rolling force, the steel sheet is oriented in either direction, the deviation occurs in the thickness of the steel sheet.

본 발명은 상기와 같은 종래의 문제점을 해결하기 위한 수단으로서, 그 목적은 압연기에서 롤의 좌, 우 압하력 편차에 따라 좌, 우 롤 갭(Gap)을 보정함으로서, 강판의 판 쏠림 및 두께편차를 미연에 방지하는 압연기의 롤 갭 제어방법에 관한 것이다.The present invention is a means for solving the conventional problems as described above, the purpose is to correct the left and right roll gap (gap) according to the left and right rolling pressure deviation of the roll in the rolling mill, the plate tilting and thickness deviation of the steel sheet It relates to a roll gap control method of a rolling mill that prevents in advance.

도1은 일반적인 압연기의 구성도이다.1 is a block diagram of a general rolling mill.

도2는 종래 압연기의 롤 갭 제어장치의 구성도이다.2 is a configuration diagram of a roll gap control device of a conventional rolling mill.

도3은 본 발명에 의한 압연기의 롤 갭 제어장치의 구성도이다.3 is a configuration diagram of a roll gap control device of the rolling mill according to the present invention.

도4는 본 발명에 의한 압연기의 롤 갭 제어방법을 나타낸 플로우차트이다.4 is a flowchart showing a roll gap control method of the rolling mill according to the present invention.

*도면의 주요부분에 대한 부호의 설명** Description of the symbols for the main parts of the drawings *

5,6: 압하력검출기 7: 강판두께설정기5, 6: pressure reduction detector 7: steel sheet thickness setter

8,12,21,22: 합산기 9,19,20: 신호변환기8,12,21,22: Total 9,19,20: Signal converter

11,17: 감산기 13,18: 비교기11,17 Subtractor 13,18 Comparator

15,16: 좌, 우 압하력 변화량 누적기15,16: Left, right rolling force change accumulator

상기한 본 발명의 목적을 달성하기 위한 수단으로서, 본 발명의 방법은 롤의 좌, 우에 설치된 실린더에 의해 롤을 상, 하로 구동시켜 원하는 강판의 두께에 따라 롤 갭(Gap)을 세팅하고, 세팅된 롤 사이로 취입되는 강판을 압연하는 압연기의 롤 갭 제어방법에 있어서,As a means for achieving the above object of the present invention, the method of the present invention is to drive the roll up and down by a cylinder installed on the left and right of the roll to set the roll gap (Gap) according to the thickness of the desired steel sheet, and set In the roll gap control method of the rolling mill for rolling the steel sheet blown between the rolls,

원하는 강판의 두께(A)를 설정하는 단계;Setting a thickness A of the desired steel sheet;

상기 롤의 좌, 우 양단에 작용하는 압하력(B,C)을 검출하는 단계;Detecting a reduction force (B, C) acting on the left and right ends of the roll;

상기 검출된 좌, 우 압하력(B,C)을 합산하는 단계;Summing the detected left and right pressing force (B, C);

상기 합산된 합산압하력(D)을 평균하여 그에 상응하는 강판 두께(F)로 환산하고, 상기 환산된 강판 두께(F)와 설정된 강판 두께(A)간의 두께편차(G)를 연산하는 단계;Calculating the thickness deviation (G) between the converted steel sheet thickness (F) and the set steel sheet thickness (A) by averaging the summed sum of the pressing force (D) to a corresponding steel sheet thickness (F);

상기 강판 두께(A)와 상기 두께편차(G)를 합산하여 1차강판두께(H)로 설정하는 단계;Adding the steel sheet thickness (A) and the thickness deviation (G) to set the primary steel sheet thickness (H);

상기 롤 사이로 강판이 취입되면, 상기 좌, 우 압하력(B,C)의 시간당 변화량을 각각 검출하고 이를 누적하여 좌, 우 압하력 변화량 누적치(I,J)로 계산하고, 상기 계산된 좌, 우 압하력 변화량 누적치(I,J)간의 누적치편차(K)를 연산하는 단계;When the steel sheet is blown between the rolls, the hourly change amounts of the left and right pressing force (B, C) are respectively detected and accumulated and calculated as left and right pressure drop amount accumulation values (I, J), and the calculated left, Calculating a cumulative value deviation K between the pressure drop force change amounts I and J;

상기 누적치편차(K)가 설정된 누적치편차허용치 이상이면, 상기 좌, 우 압하력 변화량 누적치(I,J)를 그에 상응하는 좌, 우 편차두께(L,M)로 환산하고, 상기 누적치편차(K)가 설정된 누적치편차허용치 미만이면, 상기 좌, 우 편차두께(L,M)로 0을 출력하는 단계;If the cumulative tooth deviation K is greater than or equal to the set cumulative tooth deviation allowance, the accumulated left and right pressure drop amount change values I and J are converted into corresponding left and right deviation thicknesses L and M, and the cumulative tooth deviation K is calculated. Outputting 0 as the left and right deviation thicknesses (L, M) when () is less than the set allowable cumulative deviation value;

상기 1차강판두께(H)에 상기 좌 편차두께(L)를 합산하여 좌측 롤 갭(Gap)으로 설정하고, 상기 1차강판두께(H)에 상기 우 편차두께(M)를 합산하여 우측 롤 갭(Gap)으로 설정하는 단계; 및The left deviation thickness L is added to the primary steel sheet thickness H to be set to the left roll gap Gap, and the right deviation thickness M is added to the primary steel sheet thickness H to add the right roll. Setting to a gap; And

상기 좌, 우 실린더를 상기 좌, 우측 롤 갭(Gap)만큼 구동시켜 상기 롤의 좌, 우 롤 갭(Gap)을 제어하는 단계;Controlling the left and right roll gaps of the rolls by driving the left and right cylinders by the left and right roll gaps;

로 이루어짐을 특징으로 한다.Characterized in that made.

이하, 본 발명에 따른 압연기의 롤 갭 제어방법은 첨부한 도면을 참조하여 상세하게 설명한다. 본 발명의 참조된 도면에서 실질적으로 동일한 구성 및 기능을 갖는 구성요소들은 동일한 부호를 사용할 것이다.Hereinafter, the roll gap control method of the rolling mill according to the present invention will be described in detail with reference to the accompanying drawings. In the referenced drawings of the present invention, components having substantially the same configuration and function will use the same reference numerals.

도3은 본 발명에 의한 압연기의 롤 갭 제어장치의 구성도로서, 본 발명은 종래 좌, 우 압연기의 평균압하력에 의해 설정된 강판두께에 좌, 우 압하력의 편차에 의한 편차두께를 가감산하여, 상기 압연기의 좌, 우 롤 갭(Gap)을 설정한다.3 is a configuration diagram of a roll gap control device of a rolling mill according to the present invention, and the present invention adds and subtracts a deviation thickness due to a deviation of left and right rolling forces to a steel sheet thickness set by an average rolling force of a conventional left and right rolling mill. Then, left and right roll gaps of the rolling mill are set.

상기 종래 좌, 우 압연기의 평균압하력에 의해 강판두께를 설정하는 장치는 롤(2)의 좌, 우에 각각 설치되어 롤의 좌, 우 갭을 각각 조절하는 좌, 우 실린더(3,4)와, 롤의 좌, 우에 각각 설치되어 롤의 좌, 우에 작용하는 압하력(B,C)을 각각 검출하는 좌, 우 압하력검출기(5,6)와, 상기 좌, 우 압하력검출기(5,6)의 좌, 우 압하력(B,C)을 합산하여 합산압하력(D)으로 연산하는 제1합산기(10)와, 상기 제1합산기(10)의 합산압하력(D)을 입력받아 평균하여 그에 상응하는 강판두께(F)로 환산하는 제1신호변환기(9)와, 운전자가 원하는 강판두께(A)를 설정하는 강판두께설정기(7)와, 상기 강판두께설정기(7)의 강판두께(A)에서 상기 제1신호변환기(9)의 강판두께(F)를 감산하여 두께편차(G)를 연산하는 제1감산기(11)와, 상기 강판두께설정기(7)의 강판두께(A)와 상기 제1감산기(11)의 편차두께(G)를 합산하는 제2합산기(12)를 포함한다.The apparatus for setting the steel sheet thickness by means of the average pressure reduction force of the conventional left and right rolling mills is installed on the left and right sides of the roll 2, respectively, and the left and right cylinders 3 and 4 for adjusting the left and right gaps of the rolls respectively. , The left and right pressure reduction force detectors 5 and 6 respectively installed at the left and right sides of the roll and detecting the reduction force B and C acting on the left and right sides of the roll, and the left and right pressure reduction force detectors 5 and 6 respectively. The first summer 10, which calculates the sum of the left and right pressure reduction forces B and C of 6) and calculates the total pressure reduction force D, and the total pressure reduction force D of the first summer 10, respectively. A first signal converter 9 which receives the input and converts it into a corresponding steel sheet thickness F, a steel plate thickness setter 7 for setting a steel plate thickness A desired by the driver, and the steel plate thickness setter ( A first subtractor 11 for calculating the thickness deviation G by subtracting the steel plate thickness F of the first signal converter 9 from the steel plate thickness A of 7), and the steel plate thickness setter 7 Steel plate thickness (A) of the first subtractor (11) And a second summer 12 that sums the deviation thickness G.

또한, 본 발명에서 추가된 좌, 우 압하력의 편차에 의해 강판두께를 설정하는 장치는 상기 제1합산기(10)의 합산압하력(D)을 강판 취입시 작용하는 강판취입압하력과 비교하여, 상기 합산압하력(D)이 강판취입압하력 이상이면 1신호를 출력하고, 상기 합산압하력(D)이 강판취입압하력 미만이면 0신호를 출력하는 제1비교기(13)와, 상기 제1비교기(13)로부터 1신호가 출력되면 상기 좌, 우 압하력(B,C)의 시간당 변화량을 각각 검출하여 이를 각각 누적하는 좌, 우 압하력변화량 누적기(15,16)와, 상기 좌, 우 압하력 변화량 누적기(15,16)로부터 입력된 좌, 우 압하력 변화량 누적치(I,J)간의 누적편차(K)를 연산하는 제2감산기(17)와, 상기 제2감산기(17)의 누적편차(K)를 설정된 누적치편차허용치과 비교하여, 상기 누적편차(K)가 누적치편차허용치 이상이면 1신호를 출력하고, 상기 누적편차(K)가 누적치편차허용치 미만이면 0신호를 출력하는 제2비교기(18)와, 상기 제2비교기(18)로부터 1신호가 출력되면 상기 좌, 우 압하력 변화량 누적기(15,16)로부터 입력된 좌, 우 압하력 변화량 누적치(I,J) 각각을 그에 상응하는 두께로 변환하는 제2,3신호변환기(19,20)와, 상기 제2합산기(12)의 강판두께(H)와 상기 제2신호변환기(19)의 강판두께(L)를 합산하여 상기 합산된 강판두께가 상기 압연기의 좌측 롤 갭(Gap)이 되는 제3합산기(21)와, 상기 제2합산기(12)의 강판두께(H)와 상기 제3신호변환기(20)의 강판두께(M)를 합산하여 상기 합산된 강판두께가 상기 압연기의 우측 롤 갭(Gap)이 되는 제4합산기(22)를 포함한다.In addition, the apparatus for setting the steel plate thickness by the deviation of the left and right pressure drop force added in the present invention compares the combined pressure reduction force (D) of the first summer 10 with the steel plate injection pressure drop acting upon the steel sheet blowing And a first comparator 13 for outputting a signal when the total pressure drop D is equal to or greater than the steel sheet injection pressure drop, and outputting a zero signal when the total pressure drop D is less than the steel sheet injection pressure drop; When the first signal is output from the first comparator 13, the left and right pressure drop amount change accumulator (15, 16) for detecting the hourly change amount of the left and right pressure drop force (B, C) and accumulate them, respectively, A second subtractor 17 that calculates a cumulative deviation K between left and right pressure drop amount accumulation values I and J inputted from the left and right pressure drop amount accumulators 15 and 16, and the second subtractor ( 17) and compares the accumulated deviation K with the set allowable deviation value, and outputs one signal if the accumulated deviation K is equal to or greater than the allowed allowance value. The second comparator 18 outputting a zero signal when the cumulative deviation K is less than the allowable value of the accumulated deviation, and the left and right pressure drop change accumulators when one signal is output from the second comparator 18. The second and third signal converters 19 and 20 converting each of the left and right pressure drop amount change values I and J inputted from the 15 and 16 into corresponding thicknesses; A third summer 21, in which the steel sheet thickness H and the steel sheet thickness L of the second signal converter 19 are added together so that the summed steel sheet thickness becomes the left roll gap Gap of the rolling mill; The fourth steel sheet thickness H of the second summer 12 and the steel plate thickness M of the third signal converter 20 are added to form the summed steel sheet thickness as the right roll gap Gap of the rolling mill; Summer 22.

상기 압연기의 롤(2) 사이로 강판(1)이 취입되면 롤은 압하력을 받고, 롤에 작용하는 압하력은 좌, 우 압하력검출기(5,6)에 의해 검출된다. 종래 강판의 두께를 좌우하는 좌, 우 롤 갭(Gap)은 좌, 우 압연기의 평균압하력에 따라 동일하게 설정된다. 그러나, 롤의 좌, 우 압하력은 롤의 온도에 의해 좌, 우 편차가 발생되고, 이로 인해 강판은 롤의 한 쪽으로 쏠리게 된다. 이를 방지하기 위해서, 본 발명은 종래 평균압하력에 의해 설정되던 롤 갭(Gap)에 좌, 우 압하력의 편차에 따른 롤 갭(Gap)을 좌, 우 롤 갭(Gap)달리 가감하여, 전체 좌, 우 롤 갭(Gap)을 제어한다.When the steel sheet 1 is blown in between the rolls 2 of the rolling mill, the roll receives a reduction force, and the reduction force acting on the roll is detected by the left and right reduction force detectors 5 and 6. The left and right roll gaps Gap, which influence the thickness of the conventional steel sheet, are set in the same manner according to the average pressure drop force of the left and right rolling mills. However, the left and right rolling force of the roll is left and right deviation due to the temperature of the roll, thereby causing the steel sheet to be oriented to one side of the roll. In order to prevent this, according to the present invention, the roll gap Gap according to the deviation of the left and right pressure drop force is added or subtracted from the roll gap Gap, which is conventionally set by the average pressure drop force, to the whole. Left and right roll gaps are controlled.

상기 서술한 구성에 따른 본 발명의 압연기에서 롤 갭 제어방법은 도4의 플로우차트를 참조하여 설명한다.The roll gap control method in the rolling mill of the present invention according to the above-described configuration will be described with reference to the flowchart of FIG.

운전자가 제조하고자 하는 강판두께(A)를 강판두께설정기(7)에 설정하면(100), 상기 좌, 우 압하력검출기(5,6)는 롤의 좌, 우 압하력(B,C)을 검출한다(101). 검출된 좌, 우 압하력(B,C)은 제1합산기(10)로 입력되어 합산압하력(D)로 연산되고(102) 상기 제1신호변환기(9)로 출력된다. 상기 신호변환기(9)는 상기 합산압하력(D)을 평균하여 그에 상응하는 강판두께(F)로 환산하고(103) 상기 제1감산기(11)로 출력한다. 상기 제1감산기(11)는 상기 강판두께설정기(7)의 강판두께(A)에서 환산된 강판두께(F)를 감산하여 편차두께(G)를 연산하고(104), 연산된 편차두께(G)는 상기 제2합산기(12)로 출력된다. 상기 제2합산기(12)는 상기 강판두께설정기(7)의 강판두께(A)에 상기 제1감산기(11)의 편차두께(G)를 합산함으로서, 1차강판두께(H)를 연산한다(105).When the driver sets the steel plate thickness A to be manufactured in the steel plate thickness setter 7 (100), the left and right pressure reduction force detectors 5 and 6 are left and right pressure reduction forces B and C of the roll. Is detected (101). The detected left and right pressure reduction forces B and C are input to the first summer 10 and calculated as the total pressure reduction force D, and are output to the first signal converter 9. The signal converter 9 averages the combined reduction force D, converts it into a steel plate thickness F corresponding thereto (103), and outputs it to the first subtractor 11. The first subtractor 11 calculates the deviation thickness G by subtracting the steel plate thickness F converted from the steel plate thickness A of the steel plate thickness setter 7 (104), and calculates the calculated deviation thickness ( G) is output to the second summer 12. The second summer 12 calculates the primary steel sheet thickness H by adding the deviation thickness G of the first subtracter 11 to the steel sheet thickness A of the steel sheet thickness setter 7. (105).

종래 압연기의 롤 갭(Gap)은 상기 1차강판두께(H)로 롤의 좌, 우 갭(Gap)에 동일하게 설정되었으나, 본 발명은 상기 1차강판두께(H)에 좌, 우 압하력(B,C)의 편차에 따른 강판의 좌, 우 편차두께(L,M)를 보정하여 상기 압연기의 좌, 우 롤 갭(Gap)을 달리 설정하는 방법에 관한 것이다. 이하, 좌, 우 압하력(B,C)의 편차에 따른 좌, 우 롤 갭(Gap) 제어 방법을 설명한다.The roll gap Gap of the conventional rolling mill is equally set to the left and right gaps Gap of the roll at the primary steel plate thickness H, but the present invention has a left and right pressure drop force at the primary steel plate thickness H. It relates to a method of differently setting the left and right roll gaps (Gap) of the rolling mill by correcting the left and right deviation thicknesses (L, M) of the steel sheet according to the deviation of (B, C). Hereinafter, the left and right roll gap (Gap) control method according to the deviation of the left and right pressing force (B, C) will be described.

상기 제1비교기(13)에서 상기 합산압하력(D)과 강판 취입시 발생되는 강판취입압하력을 비교하여(106), 상기 합산압하력(D)이 강판취입압하력 이상이면 상기 좌, 우 압하력 변화량 누적기(15,16)로 1신호를 출력하고, 상기 합산압하력(D)이강판취입압하력 미만이면 강판이 취입되기 전으로 판단되어 상기 좌, 우 편차두께(L,M) 대신에 0을 출력한다(112). 상기 제1비교기(13)로부터 1신호가 출력되면, 상기 좌, 우 압하력 변화량 누적기(15,16)는 시간당 좌, 우 압하력 변화량을 검출하여(107), 검출된 좌, 우 압하력 변화량을 누적한다(108). 상기 좌, 우 압하력 변화량 누적기(15,16)의 누적된 좌, 우 압하력 변화량 누적치(I,J)는 상기 제2감산기(17)로 출력되고, 상기 제2감산기(17)는 상기 좌, 우 압하력 변화량 누적치(I,J)간의 누적편차(K)를 연산하여(109) 상기 제2비교기(18)로 출력된다. 상기 제2비교기(18)는 상기 누적편차(K)와 설정된 누적편차허용치를 비교하여(110), 상기 누적편차(K)가 누적편차허용치 이상이면 1신호를 출력하고, 상기 누적편차(K)가 누적편차허용치 미만이면 상기 좌, 우 편차두께(L,M) 대신에 0을 출력한다. 상기 제2비교기(18)로부터 1신호가 출력되면, 상기 제2,3신호변환기(19,20)는 상기 좌, 우 압하력 변화량 누적기(15,16)의 좌, 우 압하력 변화량 누적치(I,J)를 그에 상응하는 좌, 우 편차두께(L,M)로 환산한다(111). 상기 제3합산기(21)는 상기 제2합산기(12)의 1차강판두께(H)에 상기 좌 편차두께(L)를 합산하여 상기 압연기의 좌측 롤 갭(Gap)으로 설정하고, 상기 제4합산기(22)는 상기 제2합산기(12)의 1차강판두께(H)에 상기 우 편차두께(M)를 합산하여 상기 압연기의 우측 롤 갭(Gap)으로 설정한다(113). 상기 제3,4합산기(21,22)에서 설정된 좌, 우측 롤 갭(Gap)에 따라 상기 압연기의 실린더가 동작하여 좌, 우 롤 갭(Gap)을 세팅하고(114), 세팅된 롤 갭에 따라 강판은 제조된다.The first comparator 13 compares the total pressure reduction force (D) with the steel sheet injection pressure force generated when the steel sheet is blown (106), and if the total pressure reduction force (D) is equal to or greater than the steel sheet injection pressure load, the left and right One signal is output to the reduction force change accumulators 15 and 16, and if the combined pressure reduction force D is less than the steel sheet injection pressure drop, it is determined before the steel sheet is blown and the left and right deviation thicknesses (L, M) Instead it outputs 0 (112). When one signal is output from the first comparator 13, the left and right pressure drop amount accumulators 15 and 16 detect the left and right pressure drop amount changes per hour (107), and thus the detected left and right pressure drop force. The amount of change is accumulated (108). The accumulated left and right pressure drop amount change values I and J of the left and right pressure drop amount change accumulators 15 and 16 are output to the second subtractor 17, and the second subtractor 17 is The cumulative deviation K between the left and right pressure drop force change amounts I and J is calculated 109 and output to the second comparator 18. The second comparator 18 compares the cumulative deviation K with a set cumulative deviation allowance 110 and outputs a signal when the cumulative deviation K is equal to or greater than the cumulative deviation allowance, and accumulates the cumulative deviation K. If is less than the allowable cumulative deviation value, 0 is output instead of the left and right deviation thicknesses (L and M). When one signal is output from the second comparator 18, the second and third signal converters 19 and 20 may accumulate left and right pressure drop amount change values of the left and right pressure drop amount accumulators 15 and 16. I, J) is converted into corresponding left and right deviation thicknesses (L, M) (111). The third summer 21 adds the left deviation thickness L to the primary steel sheet thickness H of the second summer 12 to set the left roll gap Gap of the rolling mill. The fourth summer 22 adds the right deviation thickness M to the primary steel sheet thickness H of the second summer 12 to set the right roll gap Gap of the rolling mill (113). . The cylinders of the rolling mill operate according to the left and right roll gaps Gap set in the third and fourth summers 21 and 22 to set left and right roll gaps (114), and set roll gaps. According to the steel sheet is manufactured.

본 발명은 롤의 좌, 우 압하력의 편차에 따라 좌, 우 롤 갭(Gap)을 다르게 제어함으로서, 온도에 따른 강판의 판 쏠림 및 두께편차를 방지하는 효과가 있다.The present invention by controlling the left and right roll gap (Gap) differently according to the deviation of the left, right rolling force of the roll, there is an effect of preventing the plate deflection and thickness deviation of the steel sheet according to the temperature.

Claims (2)

롤의 좌, 우에 설치된 실린더에 의해 롤을 상, 하로 구동시켜 원하는 강판의 두께에 따라 롤 갭(Gap)을 세팅하고, 세팅된 롤 사이로 취입되는 강판을 압연하는 압연기의 롤 갭 제어방법에 있어서,In the roll gap control method of the rolling mill which drives a roll up and down by the cylinder installed in the left and right of a roll, sets a roll gap Gap according to the thickness of a desired steel plate, and rolls the steel sheet blown in between the set rolls, 원하는 강판의 두께(A)를 설정하는 단계;Setting a thickness A of the desired steel sheet; 상기 롤의 좌, 우 양단에 작용하는 압하력(B,C)을 검출하는 단계;Detecting a reduction force (B, C) acting on the left and right ends of the roll; 상기 검출된 좌, 우 압하력(B,C)을 합산하는 단계;Summing the detected left and right pressing force (B, C); 상기 합산된 합산압하력(D)을 평균하여 그에 상응하는 강판 두께(F)로 환산하고, 상기 환산된 강판 두께(F)와 설정된 강판 두께(A)간의 두께편차(G)를 연산하는 단계;Calculating the thickness deviation (G) between the converted steel sheet thickness (F) and the set steel sheet thickness (A) by averaging the summed sum of the pressing force (D) to a corresponding steel sheet thickness (F); 상기 강판 두께(A)와 상기 두께편차(G)를 합산하여 1차강판두께(H)로 설정하는 단계;Adding the steel sheet thickness (A) and the thickness deviation (G) to set the primary steel sheet thickness (H); 상기 롤 사이로 강판이 취입되면, 상기 좌, 우 압하력(B,C)의 시간당 변화량을 각각 검출하고 이를 누적하여 좌, 우 압하력 변화량 누적치(I,J)로 계산하고, 상기 계산된 좌, 우 압하력 변화량 누적치(I,J)간의 누적치편차(K)를 연산하는 단계;When the steel sheet is blown between the rolls, the hourly change amounts of the left and right pressing force (B, C) are respectively detected and accumulated and calculated as left and right pressure drop amount accumulation values (I, J), and the calculated left, Calculating a cumulative value deviation K between the pressure drop force change amounts I and J; 상기 누적치편차(K)가 설정된 누적치편차허용치 이상이면, 상기 좌, 우 압하력 변화량 누적치(I,J)를 그에 상응하는 좌, 우 편차두께(L,M)로 환산하고, 상기 누적치편차(K)가 설정된 누적치편차허용치 미만이면, 상기 좌, 우 편차두께(L,M)로0을 출력하는 단계;If the cumulative tooth deviation K is greater than or equal to the set cumulative tooth deviation allowance, the accumulated left and right pressure drop amount change values I and J are converted into corresponding left and right deviation thicknesses L and M, and the cumulative tooth deviation K is calculated. Outputting 0 as the left and right deviation thicknesses (L, M) when () is less than the set allowable cumulative deviation value; 상기 1차강판두께(H)에 상기 좌 편차두께(L)를 합산하여 좌측 롤 갭(Gap)으로 설정하고, 상기 1차강판두께(H)에 상기 우 편차두께(M)를 합산하여 우측 롤 갭(Gap)으로 설정하는 단계; 및The left deviation thickness L is added to the primary steel sheet thickness H to be set to the left roll gap Gap, and the right deviation thickness M is added to the primary steel sheet thickness H to add the right roll. Setting to a gap; And 상기 좌, 우 실린더를 상기 좌, 우측 롤 갭(Gap)만큼 구동시켜 상기 롤의 좌, 우 롤 갭(Gap)을 제어하는 단계Controlling the left and right roll gaps of the rolls by driving the left and right cylinders by the left and right roll gaps. 로 이루어진 것을 특징으로 하는 압연기의 롤 갭 제어방법.Roll gap control method of the rolling mill, characterized in that consisting of. 제1항에 있어서,The method of claim 1, 상기 롤 사이로 강판의 취입 여부를 판단하기 위해서, 상기 합산압하력(D)을 강판 취입시 발생되는 강판취입압하력과 비교하여, 상기 합산압하력(D)이 강판취입압하력 이상이면 강판이 취입된 것으로 판단하는 압연기의 롤 갭 제어방법.In order to determine whether or not the steel sheet is blown between the rolls, the steel sheet is blown when the total pressure drop D is equal to or greater than the steel sheet blow pressure, compared to the steel sheet injection pressure generated when the steel sheet is blown. The roll gap control method of the rolling mill judged to have been.
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Publication number Priority date Publication date Assignee Title
KR101309922B1 (en) * 2011-08-25 2013-09-17 주식회사 포스코 Method for deciding roll gap
CN104624999A (en) * 2014-11-27 2015-05-20 中冶连铸技术工程有限责任公司 Roll gap calibration device and method for square billet tension leveler

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KR100362655B1 (en) 1998-10-13 2003-02-25 주식회사 포스코 Reversible rolling and rolled plate shape control method and control device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101309922B1 (en) * 2011-08-25 2013-09-17 주식회사 포스코 Method for deciding roll gap
CN104624999A (en) * 2014-11-27 2015-05-20 中冶连铸技术工程有限责任公司 Roll gap calibration device and method for square billet tension leveler

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