KR100425602B1 - Cooling control method of hot strip - Google Patents

Cooling control method of hot strip Download PDF

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Publication number
KR100425602B1
KR100425602B1 KR10-1999-0057667A KR19990057667A KR100425602B1 KR 100425602 B1 KR100425602 B1 KR 100425602B1 KR 19990057667 A KR19990057667 A KR 19990057667A KR 100425602 B1 KR100425602 B1 KR 100425602B1
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South Korea
Prior art keywords
steel sheet
cooling
rolled steel
hot rolled
learning coefficient
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KR10-1999-0057667A
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Korean (ko)
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KR20010056278A (en
Inventor
한흥남
최호정
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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
    • B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
    • B21B37/76—Cooling control on the run-out table
    • 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
    • B21B43/00—Cooling beds, whether stationary or moving; Means specially associated with cooling beds, e.g. for braking work or for transferring it to or from the bed
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B13/00—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion
    • G05B13/02—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric
    • G05B13/0265—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric the criterion being a learning criterion
    • 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

Abstract

본 발명은 압연된 열연강판을 권취하기 위해 냉각하는 공정에 있어서, 장시간 동안 작업이 이루어지지 않은 종류의 열연강판을 냉각시킴에 있어 동일한 종의 다수의 열연강판으로 이루어진 1세트의 첫 열연강판의 목표하는 냉각온도를 적중시킬 수 있도록 제어하는 열연강판의 냉각제어방법을 제공하는 데 그 목적이 있다.The present invention aims at a first set of hot rolled steel sheets comprising a plurality of hot rolled steel sheets of the same type in cooling a rolled hot rolled steel sheet in a cooling process for winding the rolled hot rolled steel sheet. It is an object of the present invention to provide a cooling control method for a hot rolled steel sheet that controls the cooling temperature to be hit.

본 발명에 따르면, 냉각대에서 강판의 온도를 제어하는 온도제어방법에 있어서, 다수의 강판을 냉각하면서 강판의 강종과 두께와 냉각 입측온도 및 목표 권취온도에 관한 학습계수를 저장하는 단계와, 학습계수를 보정한 기준학습계수를 계산하는 단계와, 한 세트의 강판 중에서 첫 강판이 냉각대 진입하였을 때, 기준학습계수로부터 첫 강판의 학습계수를 보정하는 단계와, 보정된 학습계수를 냉각대의 냉각제어용 수식모델에 반영하여 첫 강판의 권취온도를 피드포워드(Feed Forward)제어하는 단계와, 첫 강판의 목표 권취온도와 실측 권취온도의 차이가 있을 경우에 그 차이를 보상하기 위해 피드백(Feed back)제어를 하여 주수량을 제어하는 단계 및, 실측 냉각 입측온도와 실측 목표 권취온도 및 강판의 진행속도를 이용하여 학습계수를 구하고, 다음 냉각할 강판의 주수뱅크를 결정하는 단계를 포함하는 열연강판의 냉각제어방법이 제공된다.According to the present invention, in the temperature control method for controlling the temperature of the steel sheet in the cooling table, the step of storing the learning coefficient about the steel grade and thickness of the steel sheet and the cooling entrance temperature and the target winding temperature while cooling the plurality of steel sheets, and learning Calculating a reference learning coefficient that corrects the coefficient, correcting the learning coefficient of the first steel sheet from the reference learning coefficient when the first steel sheet enters the cooling stage among the sets of steel sheets, and cooling the corrected learning coefficient to the cooling stage. Feed forward control of the winding temperature of the first steel plate reflected in the control equation model, and feedback to compensate for the difference between the target winding temperature and the measured winding temperature of the first steel sheet. Controlling the amount of main water by controlling and obtaining a learning coefficient using the measured cooling input temperature, the measured target winding temperature and the moving speed of the steel sheet, and then cooling. Provided is a cooling control method for a hot rolled steel sheet including determining a water supply bank of a steel sheet.

Description

열연강판의 냉각제어방법{Cooling control method of hot strip}Cooling control method of hot rolled steel sheet

본 발명은 열연강판을 권취기에 감을 때의 적정온도를 유지하도록 하는 냉각제어방법에 관한 것이며, 특히, 장시간 동안 작업이 이루어지지 않은 종류의 열연강판의 냉각을 제어함에 있어 보다 빠르고 정확하게 목표하는 열연강판의 권취온도에 근접할 수 있도록 하는 냉각제어방법에 관한 것이다.The present invention relates to a cooling control method for maintaining an appropriate temperature when the hot rolled steel sheet is wound on a winding machine, and in particular, to control the cooling of a hot rolled steel sheet of a kind that has not been performed for a long time, the target hot rolled steel sheet The present invention relates to a cooling control method for allowing the winding temperature to be approached.

열간압연공정에서 열연강재인 열연강판(이하에서는 '강판'이라 함.)은 압연기에 의해 압연되고 난 후에 권취기에 권취됨으로써, 열연코일(이하에서는 '코일'이라 함.)로 제조된다. 이러한 코일을 제조하는데 있어서, 코일은 적합한 온도로 냉각되어야 한다.In a hot rolling process, a hot rolled steel sheet (hereinafter referred to as 'steel sheet'), which is a hot rolled steel, is rolled by a rolling mill and then wound into a winding machine, thereby manufacturing a hot rolled coil (hereinafter referred to as 'coil'). In making such a coil, the coil must be cooled to a suitable temperature.

도 1은 일반적으로 설치된 압연기에서 권취기까지의 냉각대를 나타낸 측면도이다.1 is a side view showing a cooling stand from a rolling mill to a winder which is generally installed.

도 1에 도시된 바와 같이, 다수의 압연기에서 압연된 강판(1)은 냉각대(10)를 지나가면서 권취하기에 적합한 온도로 냉각된다. 강판(1)은 마무리 압연기(3)에서 압연된 후에 런아우트 테이블(Run Out Table)(도면에 도시 안됨)의 상부를 지나간 후에 권취기(5)에 의해 감긴다. 강판(1)을 냉각시키는 냉각대(10)는 런아우트 테이블을 따라 배치된다. 또한, 냉각대(10)의 입구와 출측에는 각각 입측온도계(7)와 출측온도계(9)가 설치되어 있는데, 입측온도계(7)에서는 냉각대(10)에 진입하는 강판(1)의 온도를 측정하고, 출측온도계(9)는 냉각대(10)에서 권취기(5)로 진행하는 강판(1)의 온도를 측정하여 권취하기 전의 권취온도를 측정한다.As shown in FIG. 1, the steel sheet 1 rolled in a plurality of rolling mills is cooled to a temperature suitable for winding while passing through the cooling table 10. The steel sheet 1 is rolled by the finishing mill 3 and then wound by the winder 5 after passing through the top of a run out table (not shown). The cooling table 10 for cooling the steel sheet 1 is disposed along the runout table. In addition, an entrance thermometer 7 and an exit thermometer 9 are provided at the inlet and the outlet of the cooling stand 10, respectively. In the entry thermometer 7, the temperature of the steel sheet 1 entering the cooling stand 10 is measured. The measurement and the exit thermometer 9 measure the temperature of the steel sheet 1 advancing from the cooling table 10 to the winder 5 and measure the winding temperature before winding.

한편, 냉각대(10)는 런아우트 테이블들의 사이에 상하로 배치된다. 각각의 냉각대(10)는 강판에 물을 부어 강판을 냉각시키는 수냉부와 공기로 강판을 냉각시키는 공냉부로 구성된다. 냉각대(10)의 상부와 하부에 배치되어 있는 수냉부와 공냉부는 각각 공냉각뱅크와 수냉각뱅크로 나뉘며, 각각의 공,수냉각뱅크(13)는 강판을 냉각하기 위한 냉각능력을 제어한다.On the other hand, the cooling table 10 is disposed up and down between the run-out tables. Each cooling zone 10 is composed of a water cooling section for cooling the steel sheet by pouring water on the steel sheet and an air cooling section for cooling the steel sheet with air. The water cooling unit and the air cooling unit disposed on the upper and lower portions of the cooling table 10 are divided into air cooling banks and water cooling banks, respectively. Each of the air and water cooling banks 13 controls a cooling capacity for cooling the steel sheet. .

종래의 냉각제어는 강종에 따라 목표 냉각입측온도(이하에서는 'FDT'라고 함) 및 냉각출측온도(이하에서는 'CT'라고 함)를 설정하고, 그에 따라 FDT 및 CT를 적중시키도록 강판을 냉각한다. 이러한 작업수행을 위해서, 먼저, 목표 FDT와, 목표 CT 및, 강판의 목표 진행속도(v)를 이용하여 공냉량을 계산하고, 필요한 수냉량을 산출한 후에 수냉각뱅크의 수를 결정한다. 강판(1)이 마무리 압연기(3)를 빠져나온 후에, 강판의 실적 FDT와 실적 강판진행속도(v)가 측정되면, 목표하는 FDT와 목표하는 강판진행속도 대신 실적 FDT와 실적 강판진행속도를 이용하여 일정 주기마다 수냉량을 재 계산하여 수냉각뱅크의 수를 재 설정한다. 그런 후에 강판(1)이 런아우트 테이블을 빠져 나와 CT를 맞추게 된다.Conventional cooling control sets the target cooling inlet temperature (hereinafter referred to as 'FDT') and cooling outlet temperature (hereinafter referred to as 'CT') according to the steel grade, and cools the steel sheet to hit the FDT and CT accordingly. do. For this operation, first, the air cooling amount is calculated by using the target FDT, the target CT, and the target moving speed v of the steel sheet, and after calculating the required water cooling amount, the number of water cooling banks is determined. After the steel sheet 1 exits the finish rolling mill 3, when the performance FDT and the performance steel plate moving speed v of the steel plate are measured, the performance FDT and the performance steel plate moving speed are used instead of the target FDT and the target steel plate moving speed. Recalculate the amount of water cooling at regular intervals and reset the number of water cooling banks. After that, the steel sheet 1 exits the runout table to adjust the CT.

수냉에 의한 수냉강하량의 계산방식에는 학습계수가 관여하는데 이를 보다 자세히 설명하면 다음과 같다. 수냉강하량은 각 뱅크의 사용여부에 따라 뱅크당 수냉에 의한 온도강하량을 계산하고, 전체 수냉각뱅크에 대한 합을 구함으로써 구해진다. 런아우트 테이블에서의 전체 수냉강하량(Tw)은 수학식 1과 같다.The learning coefficient is involved in the calculation method of water cooling by water cooling, which is explained in more detail as follows. The water cooling drop amount is obtained by calculating the temperature drop amount by water cooling per bank depending on whether each bank is used, and calculating the sum of all the water cooling banks. The total water cooling amount Tw in the runout table is expressed by Equation 1 below.

여기에서, lbank는 i번째 뱅크의 길이이고, Hf는 코일두께이고, v는 강판의 진행속도이고, Cp는 강판의 비열이고, ρ는 강판의 밀도이고, Qiu는 i번째 상부뱅크의 열유속이며, Qid는 i번째 하부뱅크의 열유속을 나타낸다.Where lbank is the length of the i-th bank, Hf is the coil thickness, v is the traveling speed of the steel sheet, Cp is the specific heat of the steel sheet, ρ is the density of the steel sheet, and Qiu is the heat flux of the i-th upper bank, Qid represents the heat flux of the i th lower bank.

상기의 수학식 1에 한 팩터인 뱅크별 상하 열유속값을 수학식 2를 통해 계산한다.The upper and lower heat flux values for each bank, which is a factor in Equation 1 above, are calculated through Equation 2.

여기에서, fo는 기본 열유속계수이고, f2i는 i번째 뱅크의 열유속계수이고, Tiu는 상부 뱅크의 수온 보정계수이고, Tid는 하부 뱅크의 수온 보정계수이며, fv는 진행속도 보정계수이다.Here, fo is the basic heat flux coefficient, f2i is the heat flux coefficient of the i-th bank, Tiu is the water temperature correction coefficient of the upper bank, Tid is the water temperature correction coefficient of the lower bank, and fv is the running speed correction coefficient.

열유속을 계산하기 위한 fo는 수학식 3에 나타낸 것과 같이, C0에서 C8의 계수값과 학습계수 f1로 나타낼 수 있다.The fo for calculating the heat flux may be represented by a coefficient value and a learning coefficient f1 of C0 to C8, as shown in Equation 3.

여기에서, Tw은 수온이고, Wf는 강판의 폭이다.Here, Tw is water temperature and Wf is the width of a steel plate.

종래의 냉각모델의 학습계수 f1은 강종, 두께, 목표 FDT, 목표 CT에 따라 천 개 이상의 값으로 구분된다. 따라서, 동일 학습구분에 해당하는 강판이 오랜 기간 작업되지 않다가 갑자기 작업되게 되면, 다수의 강판의 데이터를 가지는 세트의 바뀜으로 인해 첫 강판의 학습계수의 부정확도로 인해 권취온도 적중율이 떨어지게 된다.The learning coefficient f1 of the conventional cooling model is classified into a thousand or more values according to the steel grade, thickness, target FDT, and target CT. Therefore, when the steel sheet corresponding to the same learning section is not worked for a long time and is suddenly operated, the coiling temperature hit ratio decreases due to the inaccuracy of the learning coefficient of the first steel sheet due to the change of the set having the data of the plurality of steel sheets.

또한, 세트 바꿈 후에 학습계수가 올바르게 회복하는 데에는 선행 다수의 강판이 냉각작업을 거쳐야만 정상적인 냉각제어가 이루어진다. 따라서, 종래의 냉각모델의 학습계수를 그대로 사용하면, 권취온도 적중율이 떨어져 한 세트를 이루는 다수의 강판 중에서 선행 일부의 강판에서 냉각불량이 발생하게 되는 단점이 있다.In addition, in order to correctly recover the learning coefficient after the set change, the cooling control is normally performed only when a plurality of steel sheets are cooled. Thus, if the learning coefficient of the conventional cooling model is used as it is, the winding temperature hit ratio is lowered, there is a disadvantage that the cooling failure occurs in the steel sheet of the preceding part of the plurality of steel sheets forming a set.

본 발명은 앞서 설명한 바와 같은 종래 기술의 문제점을 해결하기 위하여 제공된 것으로서, 생산빈도가 높은 주력 강종의 학습계수를 기준학습계수로 설정하고, 기준학습계수를 매 열연강판 작업시에 학습계수의 변화로부터 보정 학습하여 세트 바꿈 첫 강판의 학습계수에 반영하므로써, 세트 바꿈 첫 강판의 권취온도 적중율을 높일 수 있는 열연강판의 냉각제어방법을 제공하는 데 그 목적이 있다.The present invention is provided to solve the problems of the prior art as described above, the learning coefficient of the main steel grades with high production frequency is set as the reference learning coefficient, and the reference learning coefficient from the change of the learning coefficient during every hot-rolled steel sheet work The purpose of the present invention is to provide a cooling control method for hot rolled steel sheet which can increase the coiling temperature hit ratio of the first steel sheet to be changed by reflecting it on the learning coefficient of the first steel sheet to be set and changed.

도 1은 일반적으로 설치된 압연기에서 권취기까지의 냉각대를 나타낸 측면도이고,1 is a side view showing a cooling stand from a rolling mill to a winder which is generally installed,

도 2는 본 발명의 한 실시예에 따른 냉각제어시에 학습방법을 나타낸 흐름도이며,2 is a flowchart illustrating a learning method in cooling control according to an embodiment of the present invention;

도 3은 본 발명의 한 실시예에 따른 냉각제어방법과 종래의 냉각제어방법을 비교한 그래프이다.3 is a graph comparing a cooling control method and a conventional cooling control method according to an embodiment of the present invention.

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

1 : 강판 3 : 마무리 압연기1: steel sheet 3: finish rolling mill

5 : 권취기 7 : 입측 온도계5: winder 7: entrance thermometer

9 : 출측 온도계 10 : 냉각대9: exit thermometer 10: cooling stand

13 : 냉각뱅크13: cooling bank

앞서 설명한 바와 같은 목적을 달성하기 위한 본 발명에 따르면, 다수의 압연기에 의해 압연된 열연강판을 권취기에 감기 위해 냉각대에서 열연강판의 온도를 제어하는 온도제어방법에 있어서, 다수의 열연강판을 냉각하면서 상기 열연강판의 강종과 두께와 냉각 입측온도 및 목표 권취온도에 관한 학습계수를 저장하는 단계와, 상기 학습계수를 보정한 기준학습계수를 수학식 4에 의해 계산하여 저장하는 단계와, 한 세트의 열연강판 중에서 첫번째 열연강판이 상기 냉각대 진입하였을 때, 상기 기준학습계수로부터 상기 첫번째 열연강판의 학습계수를 수학식 5를 통해 보정하는 단계와, 상기 보정된 학습계수를 수학식 3에 기재된 냉각대의 냉각제어용 수식모델에 반영하여 상기 첫번째 열연강판의 권취온도를 피드포워드(Feed Forward)제어하는 단계와, 상기 첫번째 열연강판의 목표 권취온도와 실측 권취온도의 차이가 있을 경우에 상기 차이를 보상하기 위해 피드백(Feed back)제어를 하여주수량을 제어하는 단계 및, 실측 냉각입측온도와 실측 목표 권취온도 및 열연강판의 진행속도를 이용하여 학습계수를 구하고, 다음 냉각할 열연강판의 주수뱅크를 결정하는 단계를 포함하는 열연강판의 냉각제어방법이 제공된다.According to the present invention for achieving the object as described above, in the temperature control method for controlling the temperature of the hot-rolled steel sheet in the cooling table to wind the hot-rolled steel sheet rolled by a plurality of rolling mills to the winder, cooling the plurality of hot rolled steel sheet Storing the learning coefficients related to the steel grade and thickness of the hot rolled steel sheet, the cooling entrance temperature, and the target winding temperature; and calculating and storing the reference learning coefficients correcting the learning coefficients by using Equation 4. Compensating the learning coefficient of the first hot-rolled steel sheet through Equation 5 from the reference learning coefficient when the first hot-rolled steel sheet of the hot rolled steel sheet enters the cooling zone, and the corrected learning coefficient is cooled according to Equation 3 below. A feed forward control of the winding temperature of the first hot-rolled steel sheet by reflecting on a mathematical model for cooling control; In case of difference between target winding temperature and actual winding temperature of the first hot rolled steel sheet, controlling the amount of water to be fed by feedback control to compensate for the difference, and the measured cooling entrance temperature and the actual target winding temperature and There is provided a cooling control method for a hot rolled steel sheet including a step of obtaining a learning coefficient by using the progress rate of the hot rolled steel sheet and determining a water supply bank of the hot rolled steel sheet to be cooled next.

아래에서, 본 발명에 따른 열연강판의 냉각제어방법의 양호한 실시예를 첨부한 도면을 참조로 하여 상세히 설명하겠다.Hereinafter, with reference to the accompanying drawings a preferred embodiment of the cooling control method of the hot rolled steel sheet according to the present invention will be described in detail.

도면에서, 도 2는 본 발명의 한 실시예에 따른 냉각제어시에 학습방법을 나타낸 흐름도이며, 도 3은 본 발명의 한 실시예에 따른 냉각제어방법과 종래의 냉각제어방법을 비교한 그래프이다.2 is a flowchart illustrating a learning method in cooling control according to an embodiment of the present invention, and FIG. 3 is a graph comparing a cooling control method and a conventional cooling control method according to an embodiment of the present invention. .

한편, 도 2에서는 열연강판 냉각대(10)에서 생산빈도가 높은 주력강종의 학습계수를 기준학습계수로 하고, 이를 매번 학습하여 세트가 바뀌고 그 세트의 첫 강판의 냉각제어시 수식모델에 반영하여 목표 권취온도에 적중하도록 하는 방법의 흐름도를 나타내고 있다.On the other hand, in Figure 2 in the hot-rolled steel sheet cooling platform 10, the learning coefficient of the main steel grades with high production frequency as a reference learning coefficient, the learning is changed every time the set is changed and reflected in the mathematical model during the cooling control of the first steel sheet of the set The flowchart of the method to hit the target winding temperature is shown.

강판(1)을 압연하는 압연기 중에서 마무리 압연기(3)의 후방에는 런아우트 테이블 및 권취기(5) 순으로 배열되고, 마무리 압연기(3)의 후단과 권취기(5)의 전단에는 입출측 온도계(7, 9)가 설치되어 있다.In the rolling mill which rolls the steel plate 1, it arrange | positions in order of the runout table and the winding machine 5 in the rear of the finishing rolling mill 3, and the entrance-and-side thermometer is located at the rear end of the finishing rolling mill 3, and the front end of the winding machine 5. (7, 9) are provided.

한편, 종래의 냉각제어방법에서와 같이, 마무리 압연기(3)에서 압연되어 냉각되는 강판(1)의 실적 FDT와, 실적 CT 및, 강판의 진행속도(v)를 입력받아(S1), 다수의 학습계수값을 설정하고 저장한다(S2).On the other hand, as in the conventional cooling control method, the actual FDT of the steel sheet 1 rolled and cooled by the finishing mill 3, the actual CT and the traveling speed v of the steel sheet are input (S1), Set and save the learning coefficient value (S2).

이런 다수의 학습계수값을 확보한 상태에서 본 발명의 냉각제어방법이 적용된다. 본 발명의 냉각제어방법에서는 먼저, 작업된 강판(1)의 학습계수의 변화를이용하여 기준학습계수를 구하는 것에서부터 시작한다. 수학식 4에는 i번째와 i+1번째로 작업한 강판의 일반학습계수인 f1i와 f1i+1로부터 i+1번째 강판의 기준학습계수를 결정하는 식을 나타낸다.The cooling control method of the present invention is applied in the state of securing a plurality of such learning coefficient values. In the cooling control method of the present invention, first, the reference learning coefficient is started by using the change of the learning coefficient of the worked steel sheet 1. Equation 4 shows an equation for determining the reference learning coefficient of the i + 1th steel sheet from the general learning coefficients f1 i and f1 i + 1 of the steel sheets worked in the i-th and i + 1th.

여기에서, f1bi+1은 i+1번째 작업한 강판의 기준학습계수이고, f1bi은 i번째 작업한 강판의 기준학습계수이다.Here, f1b i + 1 is the reference learning coefficient of the steel sheet worked on the i + 1 th sheet, and f1b i is the reference learning coefficient of the steel sheet worked on the i th sheet.

이렇게 매 강판마다 작업시에 구한 기준학습계수의 변화를 분석하면, 냉각설비의 냉각능의 변화 추이를 알 수 있다. 이런 동일 학습구분에 해당하는 강종이 생산될 때에는 기준학습계수와 일반학습계수는 같은 값을 갖는다. 그러므로, 기준학습계수는 기준학습계수 테이블에 저장하고, 세트 바꿈 후에 작업될 강판과 동일한 학습구분을 갖으며 가장 최근에 작업된 코일의 일반학습계수 및 기준학습계수와 세트 바꿈 직전에 작업한 강판의 일반학습계수 및 기준학습계수를 이용하여 세트 바꿈 첫 강판의 학습계수를 수학식 5와 같이 보정하여 계산한다(S3).By analyzing the change of the standard learning coefficient obtained at the time of work for each steel sheet, it is possible to know the change of the cooling capacity of the cooling system. When the steel grades corresponding to the same learning classification are produced, the reference learning coefficient and the general learning coefficient have the same value. Therefore, the reference learning coefficient is stored in the reference learning coefficient table, has the same learning division as the steel sheet to be worked after the set change, and the general learning coefficient and the reference learning coefficient of the most recently worked coil and the steel sheet worked just before the set change. Using the general learning factor and the reference learning factor, the learning coefficient of the first steel sheet set is calculated by correcting it as shown in Equation 5 (S3).

여기에서, f1s1은 보정된 세트 바꿈 첫 강판의 일반학습계수이고, f1bs1-1은세트 바꿈 직전에 작업한 강판의 기준학습계수이고, f1bo는 세트 바꿈 후 작업할 강판과 동일한 학습구분을 갖으며 가장 최근에 작업한 강판의 기준학습계수이고, f1o는 세트 바꿈 후 작업할 강판과 동일한 학습구분을 갖으며 가장 최근에 작업한 코일의 일반학습계수이다.Here, f1 s1 is the general learning coefficient of the first set steel sheet to be corrected, f1b s1-1 is the standard learning coefficient of the steel sheet worked just before the set changing, and f1b o is the same learning division as the steel sheet to be worked after the set changing. It is the standard learning coefficient of the most recently worked steel plate, and f1 o is the general learning coefficient of the most recently worked coil having the same learning division as the steel plate to be worked after the set change.

이렇게 보정된 학습계수를 사용하면, 세트 바꿈 첫 강판이 냉각대에 진입하였을 경우에 런아우트 테이블의 냉각능의 변화가 직전에 작업된 강판으로부터 얻어지면서 반영되므로, 세트 바꿈 첫 강판의 권취온도 적중율을 높일 수 있다(S4). 그러나, 만약, 세트 바꿈의 첫 강판이 아닌 경우에는 초기화로 돌아가서 실적 FDT와 실적CT 및 강판의 진행속도(v)를 측정한다.Using this corrected learning coefficient, when the first set steel sheet enters the cooling zone, the change in the cooling capacity of the runout table is reflected and obtained from the steel sheet worked immediately before. Can be increased (S4). However, if it is not the first steel sheet of the set change, it returns to the initialization and measures the performance FDT, the performance CT, and the moving speed v of the steel sheet.

보정된 학습계수는 런아우트 테이블의 냉각제어용 수식모델에 반영하여 세트 바꿈 첫 강판의 피드포워드(Feed Forward)제어에 이용되며, 피드포워드제어시에 목표 권취온도와 차이가 있는 경우에는 이를 보상하기 위한 피드백(Feed Back)제어를 하여 수냉량을 제어한다. 이렇게 냉각 제어된 강판을 권취하여 코일이 제조되면 실적 FDT와 실적 CT 및 진행속도(v)를 이용하여 다시 학습계수를 구하고, 수학식 4를 사용하여 다시 기준학습계수를 구한 다음 작업할 강판에 대비한다(S5).The corrected learning coefficient is reflected in the equation model for cooling control of the runout table and used for the feed forward control of the first steel sheet to change the set, and to compensate for the difference in the target winding temperature during the feedforward control. Feed back control is used to control the amount of water cooling. When the coil is manufactured by winding the steel plate controlled in this way, the learning coefficient is obtained again using the performance FDT, the performance CT, and the moving speed (v), and the reference learning coefficient is obtained again using Equation 4, and then prepared for the steel sheet to be worked on. (S5).

이하에서는 본 발명의 열연강판의 냉각제어방법에 따른 실시예를 참조로 하여 구체적으로 설명한다.Hereinafter, with reference to the embodiment according to the cooling control method of the hot rolled steel sheet of the present invention will be described in detail.

도 3에서는 도 1에 도시된 바와 같이 구성된 강판 냉각대에서 두께가 3.5mm이고, FDT는 880℃, CT는 620℃인 SS400(대한민국 포항제철에서 생산하는 한 강종의 명칭)의 학습계수를 기준학습계수로 하고, 일정량의 열간압연 작업 후 두께 4.1mm, 폭 1059mm, 목표 CT는 580℃인 SPFH2(대한민국 포항제철에서 생산하는 한 강종의 명칭)로 세트 바꿈하였을 때, 세트 바꿈 첫 강판의 권취온도변화를 기존방법과 본 발명의 냉각제어모델에 의해 각각 제어한 결과를 나타내었다.In Figure 3, the steel sheet cooling zone configured as shown in Figure 1, the thickness is 3.5mm, FDT is 880 ℃, CT is 620 ℃ the learning coefficient of SS400 (name of one steel produced by Pohang Steel in Korea) reference learning Change in coiling temperature of the first steel sheet when set to modulus and set to SPFH2 (the name of one steel produced by Pohang Steel, Korea) at a thickness of 4.1mm, width 1059mm and target CT after a certain amount of hot rolling. The results of the control by the conventional method and the cooling control model of the present invention are shown.

도 3에 나타난 바와 같이, 본 발명의 학습기법을 이용한 냉각제어방법이 세트 바꿈 첫 강판의 권취온도 적중정도를 증가시키는데 매우 효과적임을 알 수 있다.As shown in Figure 3, it can be seen that the cooling control method using the learning technique of the present invention is very effective in increasing the winding temperature hit degree of the first set steel sheet.

앞서 상세히 설명한 바와 같이, 본 발명의 열연강판의 냉각제어방법은 같은 종의 다수의 열연강판으로 구성된 한 세트에서 다른 세트로 바뀌면서 다른 세트의 첫 강판의 목표 권취온도에 적중율을 향상시킬 수 있는 제어방법으로 바뀐 세트의 첫 강판의 냉각능의 변화로 인한 불량을 예방할 수 있다는 장점이 있다.As described in detail above, the cooling control method of the hot-rolled steel sheet of the present invention is a control method that can improve the hit ratio to the target coiling temperature of the first steel sheet of another set by changing from one set to another set consisting of a plurality of hot-rolled steel sheet of the same type There is an advantage that it is possible to prevent the failure caused by the change in the cooling capacity of the first steel sheet of the set changed to.

이상에서 본 발명의 열연강판의 냉각제어방법에 대한 기술사상을 첨부도면과 함께 서술하였지만, 이는 본 발명의 가장 양호한 실시예를 예시적으로 설명한 것이지 본 발명을 한정하는 것은 아니다. 또한, 이 기술분야의 통상의 지식을 가진 자이면 누구나 본 발명의 기술사상의 범주를 이탈하지 않는 범위 내에서 다양한 변형 및 모방이 가능함은 명백한 사실이다.Although the technical idea of the method for controlling the cooling of the hot rolled steel sheet according to the present invention has been described with the accompanying drawings, this is illustrative of the best embodiment of the present invention and is not intended to limit the present invention. In addition, it is obvious that any person skilled in the art can make various modifications and imitations without departing from the scope of the technical idea of the present invention.

Claims (1)

다수의 압연기에 의해 압연된 열연강판을 권취기에 감기 위해 냉각대에서 열연강판의 온도를 제어하는 열연강판의 냉각제어방법으로서,As a cooling control method of a hot rolled steel sheet for controlling the temperature of the hot rolled steel sheet in the cooling stand for winding the hot rolled steel sheet rolled by a plurality of rolling mills to the winding machine, 다수의 열연강판을 냉각하면서 상기 열연강판의 강종, 두께, 냉각 입측온도 및 목표 권취온도에 관한 학습계수를 저장하는 제1 단계와;A first step of storing a learning coefficient relating to steel grade, thickness, cooling entrance temperature, and target winding temperature of the hot rolled steel sheet while cooling a plurality of hot rolled steel sheets; 상기 학습계수를 보정한 기준학습계수를 다음의 식(1)에 의해 계산하는 제2 단계와;A second step of calculating a reference learning coefficient by correcting the learning coefficient by the following equation (1); 한 세트의 열연강판 중에서 첫번째 열연강판이 상기 냉각대에 진입하는 경우에 상기 기준학습계수로부터 상기 첫번째 열연강판의 학습계수를 다음의 식(2)에 의해 보정하는 제3 단계와;A third step of correcting a learning coefficient of the first hot-rolled steel sheet from the reference learning coefficient by the following equation (2) when the first hot-rolled steel sheet enters the cooling zone among a set of hot-rolled steel sheets; 상기 보정된 학습계수를 상기 냉각대의 냉각제어용 수식모델에 반영하여 상기 첫번째 열연강판의 권취온도를 피드포워드(Feed Forward)제어하는 제4 단계와;A fourth step of feeding forward the winding temperature of the first hot-rolled steel sheet by reflecting the corrected learning coefficient into a mathematical model for cooling control of the cooling zone; 상기 첫번째 열연강판의 목표 권취온도와 실측 권취온도를 측정 비교한 후에 그 차이를 보상하기 위해 피드백(Feed back)제어를 하여, 주수량을 조정하는 제5 단계; 및A fifth step of adjusting the amount of pouring water by performing feedback control to compensate the difference after measuring and comparing the target winding temperature and the measured winding temperature of the first hot rolled steel sheet; And 실측 냉각입측온도와 실측 목표 권취온도 및 열연강판의 진행속도를 이용하여 학습계수를 구하고, 다음 냉각할 열연강판의 주수뱅크를 결정하는 제6 단계를 포함하는 것을 특징으로 하는 열연강판의 냉각제어방법.And a sixth step of obtaining a learning coefficient by using the measured cooling entrance temperature, the measured target winding temperature, and the moving speed of the hot rolled steel sheet, and determining the main bank of the hot rolled steel sheet to be cooled next. . ~~~~~~~~ (1) ~~~~~~~~ (1) f1bi+1: i+1번째 작업한 열연강판의 기준학습계수, f1bi: i번째 작업한 열연강판의 기준학습계수.f1b i + 1 : Reference learning coefficient of i + 1 hot rolled steel sheet, f1b i : Reference learning coefficient of i-worked hot rolled steel sheet. ~~~~~~~~ (2) ~~~~~~~~ (2) f1s1: 보정된 세트 바꿈 첫번째 열연강판의 일반학습계수, f1bs1-1: 세트 바꿈 직전에 작업한 열연강판의 기준학습계수, f1bo: 세트 바꿈 후 작업할 열연강판과 동일한 학습구분을 갖으며 가장 최근에 작업한 열연강판의 기준학습계수, f1o: 세트 바꿈 후 작업할 열연강판과 동일한 학습구분을 갖으며 가장 최근에 작업한 열연강판의 일반학습계수.f1 s1 : Corrected set change The general learning coefficient of the first hot rolled steel sheet, f1b s1-1 : Reference learning coefficient of the hot rolled steel sheet worked just before the set change, f1b o : It has the same learning division as the hot rolled steel sheet to be worked after the set change. Standard learning coefficient of hot rolled steel sheet, f1 o : It has the same learning division as hot rolled steel sheet to be worked after changing the set and general learning coefficient of hot rolled steel sheet.
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KR20020052723A (en) * 2000-12-26 2002-07-04 이구택 coiling temperature control method of hot strip using learning method
KR101119006B1 (en) 2009-07-31 2012-03-09 주식회사 포스코 Method for controlling coiling temperature of milling slab

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KR100563260B1 (en) * 2001-06-19 2006-03-27 주식회사 포스코 Cooling control method for compensating set-up temperature by recalculating amount of cooling water
KR100711387B1 (en) * 2005-12-21 2007-04-30 주식회사 포스코 Method for controlling longitudinal direction temperature of hot-rolled steel plate
KR100843842B1 (en) * 2006-12-22 2008-07-03 주식회사 포스코 Temperature controlling method and apparatus in hot strip mill

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KR20020052723A (en) * 2000-12-26 2002-07-04 이구택 coiling temperature control method of hot strip using learning method
KR101119006B1 (en) 2009-07-31 2012-03-09 주식회사 포스코 Method for controlling coiling temperature of milling slab

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