KR100848650B1 - Control method of plate thickness change according to circumferential speed and temperature - Google Patents

Control method of plate thickness change according to circumferential speed and temperature Download PDF

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KR100848650B1
KR100848650B1 KR1020010084555A KR20010084555A KR100848650B1 KR 100848650 B1 KR100848650 B1 KR 100848650B1 KR 1020010084555 A KR1020010084555 A KR 1020010084555A KR 20010084555 A KR20010084555 A KR 20010084555A KR 100848650 B1 KR100848650 B1 KR 100848650B1
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roll gap
plate
change
roughing mill
plate thickness
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KR1020010084555A
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Korean (ko)
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KR20030054413A (en
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권영섭
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주식회사 포스코
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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
    • B21B37/16—Control of thickness, width, diameter or other transverse dimensions
    • B21B37/165—Control of thickness, width, diameter or other transverse dimensions responsive mainly to the measured thickness of the product
    • 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
    • B21B37/58—Roll-force control; Roll-gap control
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
    • B21B38/006—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring temperature
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
    • B21B38/04—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring thickness, width, diameter or other transverse dimensions of the product
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2261/00—Product parameters
    • B21B2261/20—Temperature
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2271/00—Mill stand parameters
    • B21B2271/02—Roll gap, screw-down position, draft position
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2275/00—Mill drive parameters
    • B21B2275/02—Speed
    • B21B2275/06—Product speed

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Metal Rolling (AREA)

Abstract

본 발명은 박 슬라브 공정에서 주속 및 그에 따른 주편의 온도 변화로 인해 압연시 발생하는 판 두께의 변화를 제어하는 방법에 관한 것으로서, 본 발명의 방법은 조압연기(16, 17)의 치입전 상태의 판(23)의 주속 및 온도를 판 속도계 및 온도계(24)를 통해 각각 측정한 후, 이 측정신호를 통해 롤 갭 계산기(25)에서 롤 갭의 변화량을 계산하는 단계와, 롤 갭이 변화되는 판의 해당부분이 조압연기에 치입되는 시점에 롤 갭의 변화량을 롤 갭 제어기(21)에서 출력되는 출력신호와 합하여 조압연기의 롤 갭을 제어하는 단계를 포함한다. 본 발명의 방법은 박 슬라브 공정에서 주속 및 그에 따른 주편의 온도 변화로 인해 발생하는 판 두께의 변화를 고려하여 판 두께를 제어함으로써 판 두께의 편차를 최소화하는 장점이 있다. The present invention relates to a method for controlling a change in plate thickness caused by rolling in a thin slab process due to the circumferential speed and the temperature change of the cast steel, and the method of the present invention is a pre-indentation state of the roughing mill (16, 17) After measuring the circumferential speed and the temperature of the plate 23 through the plate speedometer and the thermometer 24, and calculating the change amount of the roll gap in the roll gap calculator 25 through the measurement signal, the roll gap is changed And controlling the roll gap of the roughing mill by adding the change amount of the roll gap with the output signal output from the roll gap controller 21 at the time when the corresponding part of the plate is inserted into the roughing mill. The method of the present invention has an advantage of minimizing the variation in the plate thickness by controlling the plate thickness in consideration of the change in the plate thickness caused by the circumferential speed and thus the temperature change of the slab in the thin slab process.

Description

주속 및 온도 변화에 따른 판 두께 변화 제어방법{Method of Roll Gap Control of the Coil in Accordance with Temperature and Casting Speed Variation}Method of controlling plate thickness change according to circumferential speed and temperature change {Method of Roll Gap Control of the Coil in Accordance with Temperature and Casting Speed Variation}

도 1은 통상의 박 슬라브 연속주조 공정의 개략도이고, 1 is a schematic diagram of a conventional thin slab continuous casting process,

도 2는 종래기술에 따른 판 두께 제어방법을 설명하기 위한 개략도이고, 2 is a schematic view for explaining a plate thickness control method according to the prior art,

도 3은 본 발명의 한 실시예에 따른 판 두께 제어방법을 설명하기 위한 개략도이며, 3 is a schematic view for explaining a plate thickness control method according to an embodiment of the present invention,

도 4는 본 발명에 따른 롤 갭 변화량을 계산하는 흐름도이다. 4 is a flowchart for calculating roll gap variation according to the present invention.

♠ 도면의 주요부분에 대한 부호의 설명 ♠  ♠ Explanation of symbols on the main parts of the drawing ♠

11 : 레들 터렛 12 : 레들11: ladle turret 12: ladle

13 : 턴디쉬 14 : 몰드13: tundish 14: mold

15 : 지지롤 16, 17 : 조압연기15: support roll 16, 17: roughing mill

18 : 인덕션 히터 19 : 권취기18: induction heater 19: winder

20 : 판 두께 측정기 21 : 롤 갭 제어기20: plate thickness meter 21: roll gap controller

22 : 인발롤 23 : 압연판22: drawing roll 23: rolled sheet

24 : 판속도계 및 온도계 25 : 롤 갭 계산기24: Speedometer & Thermometer 25: Roll Gap Calculator

본 발명은 판 두께 변화 제어방법에 관한 것이며, 특히, 박 슬라브 공정에서 주속 및 그에 따른 주편의 온도 변화로 인해 압연시 발생하는 판 두께의 변화를 제어하는 방법에 관한 것이다. The present invention relates to a method for controlling plate thickness change, and more particularly, to a method for controlling a change in plate thickness caused by rolling in a thin slab process due to the circumferential speed and thus the temperature change of the cast steel.

도 1은 통상의 박 슬라브 연속주조 공정의 개략도이다. 도 1에 도시된 바와 같이, 박 슬라브 연속주조 공정은 레들 터렛(11 ; Ladle Turret)을 통해 레들(12 ; Ladle)에 담겨진 용강이 턴디쉬(13 ; Tundish)로 연속적으로 흘러 들어간다. 그런 다음, 계속해서 몰드(14 ; Mold) 및 지지롤(15)을 지나 주편의 형태로 만들어지고, 이것은 조압연기(16, 17)를 거쳐 슬라브가 코일의 형태로 만들어진다. 이 코일은 인덕션 히터(18 ; Induction Heater)를 거쳐 권취기(19)에서 권취된다. 1 is a schematic diagram of a conventional thin slab continuous casting process. As shown in FIG. 1, in the thin slab continuous casting process, molten steel contained in a ladle 12 is continuously flowed into a tundish 13 through a ladle turret 11. Then, it is made in the form of a cast through the mold (14) and the support roll (15), which is passed through the rough rolling mill (16, 17) to form a slab in the form of a coil. This coil is wound up in the winder 19 via an induction heater 18.

상기와 같은 박 슬라브 연속주조 공정은 조업조건에 의해 주조속도가 변화하게 되는데, 이러한 주조속도의 변화는 주편의 온도를 0.1m 당 12℃씩 변화시킨다. 즉, 주조속도가 증가하면 주편의 온도가 올라가고, 감소하면 온도가 떨어지게 된다. 그로 인해, 주편의 강성변화 및 두께 변화를 초래한다. In the thin slab continuous casting process as described above, the casting speed is changed by operating conditions. The change in the casting speed changes the temperature of the cast steel by 12 ° C. per 0.1m. In other words, as the casting speed increases, the temperature of the cast increases, and when decreased, the temperature drops. This causes a change in stiffness and a change in thickness of the cast steel.

도 2는 박 슬라브 공정에서 행해지는 종래기술에 따른 판 두께 제어방법을 설명하기 위한 개략도이다. 도 2에 도시된 바와 같이, 종래의 판 두께 제어방법은 판 두께를 측정하는 판 두께 측정기(20)에서 측정한 두께신호를 바탕으로 이미 설정된 기준 두께와 서로 비교하여 에러 값을 구하고, 이 에러 값을 비례 미분제어를 통해 롤 갭(Roll Gap)을 제어하는 롤 갭 제어기(21)를 통해 조압연기(16, 17)의 롤 갭을 제어하는 것이다. Figure 2 is a schematic diagram for explaining a plate thickness control method according to the prior art performed in the thin slab process. As shown in FIG. 2, in the conventional plate thickness control method, an error value is obtained by comparing with a previously set reference thickness based on a thickness signal measured by a plate thickness meter 20 measuring plate thickness. This is to control the roll gaps of the roughing mill (16, 17) through the roll gap controller 21 for controlling the roll gap through the proportional differential control.

그러나, 도 2와 같은 종래의 방법은 단지 판 두께 정보만을 통해 조압연기(16, 17)의 롤 갭을 제어하여 조압연을 수행하는 것으로서, 박 슬라브 공정에서 주속 및 그에 따른 주편의 온도 변화로 인해 압연시 발생하는 판 두께의 변화를 고려하지 않았다. 그로 인해, 조압연기(16, 17)를 통한 조압연 후에 코일의 두께편차가 크게 발생하고, 이러한 두께편차는 후에 진행될 사상압연에서도 같은 비율로 두께편차가 코일 내에서 발생하여, 저가의 열연코일이 생산되는 문제점이 있다. However, the conventional method as shown in Figure 2 is to perform the rough rolling by controlling the roll gap of the rough mill (16, 17) only through the plate thickness information, due to the circumferential speed in the thin slab process and thus the temperature of the cast steel No change in plate thickness that occurs during rolling is taken into account. Therefore, a large thickness deviation of the coil occurs after rough rolling through the rough rolling mills 16 and 17, and such a thickness deviation occurs in the coil at the same rate even in the finishing rolling to be performed later, so that a low-cost hot rolled coil There is a problem produced.

따라서, 본 발명은 앞서 설명한 바와 같은 종래기술의 문제점을 해결하기 위하여 안출된 것으로서, 박 슬라브 공정에서 주속 및 그에 따른 주편의 온도 변화로 인해 발생하는 판 두께의 변화를 고려하여 판 두께를 제어함으로써 판 두께의 편차를 최소화하는 판 두께 변화 제어방법을 제공하는 데 그 목적이 있다. Accordingly, the present invention has been made to solve the problems of the prior art as described above, by controlling the plate thickness in consideration of the change in the plate thickness caused by the circumferential speed and the change in temperature of the slab in the thin slab process by controlling the plate thickness It is an object of the present invention to provide a method for controlling plate thickness variation that minimizes variations in thickness.

상기 목적을 달성하기 위한 본 발명에 따르면, 조압연기의 출측에 위치하는 판 두께 측정기를 통해 측정한 판 두께와 이미 설정된 기준 두께와 서로 비교하여 에러 값을 구하고, 이 에러 값을 롤 갭 제어기에 적용하여 상기 조압연기의 롤 갭을 제어하여 판 두께 변화를 제어하는 방법에 있어서, 상기 조압연기의 치입전 상태의 판의 주속 및 온도를 판 속도계 및 온도계를 통해 각각 측정한 후, 이 측정신호를 통해 롤 갭 계산기에서 롤 갭의 변화량을 계산하는 단계와, 상기 롤 갭이 변화되는 판의 해당부분이 상기 조압연기에 치입되는 시점에 상기 롤 갭의 변화량을 상기 롤 갭 제어기에서 출력되는 출력신호와 합하여 상기 조압연기의 롤 갭을 제어하여 판 두께 변화를 제어하는 단계를 포함하는 것을 특징으로 한다. According to the present invention for achieving the above object, an error value is obtained by comparing the plate thickness measured by a plate thickness meter located at the exit side of the roughing mill with a preset reference thickness, and applying the error value to the roll gap controller. In the method of controlling the plate thickness change by controlling the roll gap of the roughing mill, the circumferential speed and temperature of the plate in the pre-indentation state of the roughing mill are respectively measured through a plate speedometer and a thermometer, and then Calculating a change amount of the roll gap in a roll gap calculator; and adding the change amount of the roll gap with an output signal output from the roll gap controller at a time when a corresponding portion of the plate on which the roll gap is changed is introduced into the rough rolling machine. And controlling a change in the thickness of the plate by controlling the roll gap of the roughing mill.

아래에서, 본 발명에 따른 주속 및 온도 변화에 따른 판 두께 변화 제어방법의 양호한 실시예를 첨부한 도면을 참조로 하여 상세히 설명하겠다. In the following, with reference to the accompanying drawings, a preferred embodiment of the plate thickness change control method according to the circumferential speed and temperature change according to the present invention will be described in detail.

도 3은 본 발명의 한 실시예에 따른 판 두께 제어방법을 설명하기 위한 개략도이다. 도 3에 도시된 바와 같이, 본 발명의 판 두께 변화 제어방법은 종래에 고려하지 않았던 박 슬라브 공정에서 주속 및 그에 따른 주편의 온도 변화로 인해 압연시 발생하는 판 두께의 변화를 고려한 것이다. 즉, 본 발명의 판 두께 변화 제어방법은 종래의 제어방법에 주속 및 온도 변화에 따른 판 두께의 변화 정보를 추가하여 판 두께를 제어한 것이다. 3 is a schematic view for explaining a plate thickness control method according to an embodiment of the present invention. As shown in FIG. 3, the plate thickness change control method of the present invention considers a change in plate thickness generated during rolling due to a circumferential speed and a temperature change of the cast steel in the thin slab process, which has not been conventionally considered. That is, the plate thickness change control method of the present invention is to control the plate thickness by adding the change information of the plate thickness according to the circumferential speed and the temperature change to the conventional control method.

그래서, 본 발명은 조압연기(16, 17)에 선행하여 위치하는 인발롤(22 ; Pinch Roll)의 치입전의 압연판(23)의 주속 및 온도를 측정한 것이다. 즉, 인발롤(22)에 치입되기 전 상태의 압연판(23)의 주속 및 온도를 판 속도계 및 온도계(24)를 통해 각각 측정한다. 이렇게 판 속도계 및 온도계(24)를 통해 각각 측정한 주속 및 온도신호를 통해 롤 갭 계산기(25 ; Roll Gap Computer)에서 롤 갭(Roll Gap)의 변화량을 계산한다. 이러한 주속 및 온도신호를 통한 롤 갭의 변화량 계산은 도 4를 통해 상세히 설명하겠다. Thus, the present invention measures the circumferential speed and temperature of the rolled plate 23 before dentation of the draw rolls 22 (Pinch Roll) positioned prior to the roughing mills 16 and 17. That is, the circumferential speed and temperature of the rolled plate 23 in the state before being inserted into the drawing roll 22 are measured through the plate speedometer and the thermometer 24, respectively. The variation of the roll gap is calculated by the roll gap computer 25 using the circumferential speed and temperature signals respectively measured by the plate speedometer and the thermometer 24. Calculation of the change amount of the roll gap through the circumferential speed and the temperature signal will be described in detail with reference to FIG. 4.

상기와 같은 방법을 통해 롤 갭의 변화량이 계산되면, 이 롤 갭의 변화량을 종래의 제어방법에 사용되는 롤 갭 제어기(21)에서 출력되는 출력신호와 합하여 조 압연기(16, 17)의 롤 갭을 제어하는 것이다. When the amount of change in the roll gap is calculated through the above method, the amount of change in the roll gap is added to the output signal output from the roll gap controller 21 used in the conventional control method and the roll gaps of the rough mills 16 and 17 are adjusted. To control.

도 4는 본 발명을 좀 더 구체적으로 설명해 주는 본 발명에 따른 롤 갭 변화량을 계산하는 흐름도이다. 도 4에 도시된 바와 같이, 먼저, 판 속도계 및 온도계(24)에서 측정한 온도 측정값을 통해 변형저항식[f(Δt)]을 수학식 1을 통해 롤 갭 계산기(25)에서 구한다. 4 is a flowchart for calculating a roll gap change amount according to the present invention for explaining the present invention in more detail. As shown in FIG. 4, first, the strain resistance equation f (Δt) is obtained from the roll gap calculator 25 through Equation 1 through the temperature measurement measured by the plate speedometer and the thermometer 24.

Figure 112001034464916-pat00001
Figure 112001034464916-pat00001

상기 수학식 1에서

Figure 112001034464916-pat00002
로 간략화시킬 수 있다. 물론, 여기서
Figure 112001034464916-pat00003
로 표기할 수 있다. 그리고, ΔT 는 판 속도계 및 온도계(24)에서 측정한 온도 측정값의 변화량이 된다. 따라서, 수학식 1은 수학식 2와 같이 표현할 수 있다. In Equation 1
Figure 112001034464916-pat00002
Can be simplified. Of course, here
Figure 112001034464916-pat00003
It can be written as ΔT is the amount of change in the temperature measured value measured by the plate speedometer and the thermometer 24. Therefore, Equation 1 may be expressed as Equation 2.

Figure 112001034464916-pat00004
Figure 112001034464916-pat00004

그리고, 상위 컴퓨터를 통해 무선으로 제공되는 압연판(23)의 판폭(W)신호와, 조압연기(16, 17)에서 롤과 압연판(23)이 서로 접촉하는 접촉길이 및 접촉면에 대한 신호를 통해 롤 포스(Roll Force)의 변화량을 롤 갭 계산기(25)에서 계산하는데, 이러한 롤 포스 변화량은 수학식 3과 같이 표현된다.In addition, the signal of the plate width (W) of the rolling plate 23 provided wirelessly through the host computer and the contact length and the contact surface of the roll and the rolling plate 23 in contact with each other in the rough rolling mill (16, 17) The roll force change amount is calculated by the roll gap calculator 25, and the roll force change amount is expressed by Equation 3 below.

Figure 112001034464916-pat00005
Figure 112001034464916-pat00005

상기 수학식 3에서 W는 판폭, Δt는 온도의 변화, R'은 조압연기에서 롤과 압연판이 서로 접촉하는 접촉길이, H는 조압연기의 치입전 압연판의 두께, h는 조압연기 출측의 압연판의 두께를 각각 나타낸다. In Equation 3, W is the width of the plate, Δt is the change in temperature, R 'is the contact length of the roll and the rolling plate in contact with each other in the roughing mill, H is the thickness of the rolled sheet before the immersion of the roughing mill, h is the rolling on the exit side of the roughing mill Each thickness is shown.

이렇게 계산된 롤 포스 변화량은 밀상수(Mill Constant ; m)로 나눔으로써 롤 갭 변화량(ΔS')이 된다. 이러한 롤 갭 변화량(ΔS')은 주조속도를 바탕으로 하여 롤 갭이 변화되는 압연판의 해당부분이 조압연기(16, 17)에 치입되는 시점에 적용된다. 이 시점은 롤 갭 계산기(25)와 상위 컴퓨터 및 롤 갭 제어기(21)의 무선통신을 통해 제공된다. The calculated roll force change amount is divided by the mill constant (M) to become the roll gap change amount ΔS '. This roll gap change amount [Delta] S 'is applied at the time when the corresponding portion of the rolled plate whose roll gap is changed on the basis of the casting speed is inserted into the roughing mills 16 and 17. This point is provided via the radio communication between the roll gap calculator 25 and the host computer and the roll gap controller 21.

상기와 같은 방법을 통해 롤 갭 변화량(ΔS')이 계산되면, 이 롤 갭 변화량(ΔS')을 종래의 제어방법에 사용되는 롤 갭 제어기(21)에서 출력되는 출력신호와 합하여 조압연기(16, 17)의 롤 갭을 제어한다. 이렇게 롤 갭 변화량(ΔS')을 롤 갭 제어기(21)에서 출력되는 출력신호와 합하여 조압연기(16, 17)의 롤 갭을 제어하게 된다. 이 때, 전체적인 롤 갭 변화량은 수학식 4를 통해 가능하다. When the roll gap change amount ΔS 'is calculated through the above method, the roll gap change amount ΔS' is combined with the output signal output from the roll gap controller 21 used in the conventional control method, so that the rough rolling machine 16 , 17) to control the roll gap. In this way, the roll gap change amount ΔS 'is combined with the output signal output from the roll gap controller 21 to control the roll gaps of the roughing mills 16 and 17. At this time, the total roll gap change amount is possible through the equation (4).

Figure 112001034464916-pat00006
Figure 112001034464916-pat00006

상기 수학식 4의 f(Δt)는 수학식 2와 같이 표현된다. F (Δt) in Equation 4 is expressed as Equation 2.

앞서 상세히 설명한 바와 같이 본 발명의 주속 및 온도 변화에 따른 판 두께 변화 제어방법은 박 슬라브 공정에서 주속 및 그에 따른 주편의 온도 변화로 인해 발생하는 판 두께의 변화를 고려하여 판 두께를 제어함으로써 판 두께의 편차를 최소화하는 장점이 있다.  As described in detail above, the plate thickness change control method according to the change in the circumferential speed and temperature of the present invention controls the plate thickness by controlling the plate thickness in consideration of the change in the plate thickness caused by the circumferential speed and the temperature change of the cast steel in the thin slab process. There is an advantage of minimizing the deviation.

이상에서 본 발명의 주속 및 온도 변화에 따른 판 두께 변화 제어방법에 대한 기술사항을 첨부도면과 함께 서술하였지만 이는 본 발명의 가장 양호한 실시예를 예시적으로 설명한 것이지 본 발명을 한정하는 것은 아니다. In the above description of the technical details of the plate thickness change control method according to the circumferential speed and temperature change of the present invention with reference to the accompanying drawings, which illustrate the best embodiment of the present invention by way of example and not limit the present invention.

또한, 이 기술분야의 통상의 지식을 가진 자이면 누구나 본 발명의 기술사상의 범주를 이탈하지 않고 첨부한 특허청구의 범위내에서 다양한 변형 및 모방이 가능함은 명백한 사실이다.
In addition, it is obvious that any person skilled in the art can make various modifications and imitations within the scope of the appended claims without departing from the scope of the technical idea of the present invention.

Claims (2)

조압연기의 출측에 위치하는 판 두께 측정기를 통해 측정한 판 두께와 이미 설정된 기준 두께와 서로 비교하여 에러 값을 구하고, 이 에러 값을 롤 갭 제어기에 적용하여 상기 조압연기의 롤 갭을 제어하여 판 두께 변화를 제어하는 방법에 있어서, An error value is obtained by comparing the plate thickness measured by a plate thickness meter located at the exit side of the roughing mill with a preset reference thickness, and applying the error value to the roll gap controller to control the roll gap of the roughing mill. In the method of controlling the thickness change, 상기 조압연기의 치입전 상태의 판의 주속 및 온도를 판 속도계 및 온도계를 통해 각각 측정한 후, 이 측정신호를 통해 롤 갭 계산기(Roll Gap Computer)에서 롤 갭(Roll Gap)의 변화량을 계산하는 단계와, After measuring the circumferential speed and temperature of the plate in the pre-indentation state of the roughing mill through a plate speedometer and a thermometer, the change amount of the roll gap is calculated by the roll gap computer using the measurement signal. Steps, 상기 롤 갭이 변화되는 판의 해당부분이 상기 조압연기에 치입되는 시점에 상기 롤 갭의 변화량을 상기 롤 갭 제어기에서 출력되는 출력신호와 합하여 상기 조압연기의 롤 갭을 제어하여 판 두께 변화를 제어하는 단계를 포함하는 것을 특징으로 하는 주속 및 온도 변화에 따른 판 두께 변화 제어방법. Controlling the roll gap of the roughing mill by controlling the roll gap of the roughing mill by adding the change amount of the roll gap with the output signal outputted from the roll gap controller when the corresponding portion of the plate where the roll gap is changed is inserted into the roughing mill. Plate thickness change control method according to the circumferential speed and temperature changes, characterized in that it comprises a step. 제1항에 있어서, 상기 롤 갭의 변화량은 하기의 식으로 표현되는 롤 포스 변화량을 밀상수(Mill Constant ; m)로 나눔으로써 계산되는 것을 특징으로 하는 주속 및 온도 변화에 따른 판 두께 변화 제어방법. The method according to claim 1, wherein the change amount of the roll gap is calculated by dividing the change amount of the roll force expressed by the following equation by a mill constant (m). .
Figure 112008002381365-pat00007
Figure 112008002381365-pat00007
 여기서, W는 판폭, Δt는 온도의 변화, R'은 조압연기에서 롤과 판이 서로 접촉하는 접촉길이, H는 조압연기의 치입전 판 두께, h는 조압연기 출측의 판 두께를 각각 나타낸다. Where W is the width of the plate, Δt is the change in temperature, R 'is the contact length at which the roll and plate are in contact with each other in the roughing mill, H is the sheet thickness before the rough rolling of the roughing mill, and h is the sheet thickness at the exit of the roughing mill.
KR1020010084555A 2001-12-24 2001-12-24 Control method of plate thickness change according to circumferential speed and temperature KR100848650B1 (en)

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KR940005332A (en) * 1992-06-19 1994-03-21 사 또 후미오 Control device of continuous hot rolling mill
KR19980070668A (en) * 1997-01-16 1998-10-26 니시무로다이조 Control method and control device of rolling mill

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Publication number Priority date Publication date Assignee Title
KR940005332A (en) * 1992-06-19 1994-03-21 사 또 후미오 Control device of continuous hot rolling mill
KR19980070668A (en) * 1997-01-16 1998-10-26 니시무로다이조 Control method and control device of rolling mill

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