KR20010058077A - Method for controlling gap of rolls in cold mill - Google Patents

Method for controlling gap of rolls in cold mill Download PDF

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Publication number
KR20010058077A
KR20010058077A KR1019990061554A KR19990061554A KR20010058077A KR 20010058077 A KR20010058077 A KR 20010058077A KR 1019990061554 A KR1019990061554 A KR 1019990061554A KR 19990061554 A KR19990061554 A KR 19990061554A KR 20010058077 A KR20010058077 A KR 20010058077A
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South Korea
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thickness
roll gap
pickling
rolling
roll
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KR1019990061554A
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Korean (ko)
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KR100431843B1 (en
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노호섭
정석모
이훈휘
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이구택
포항종합제철 주식회사
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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
    • B21B37/58—Roll-force control; Roll-gap control
    • B21B37/62—Roll-force control; Roll-gap control by control of a hydraulic adjusting device
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
    • B21B1/28—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by cold-rolling, e.g. Steckel cold mill
    • 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
    • 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
    • B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
    • B21B38/06—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring tension or compression
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2261/00—Product parameters
    • B21B2261/02—Transverse dimensions
    • B21B2261/04—Thickness, gauge
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2265/00—Forming parameters
    • B21B2265/12—Rolling load or rolling pressure; roll force
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2265/00—Forming parameters
    • B21B2265/18—Elongation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2267/00—Roll parameters
    • B21B2267/02—Roll dimensions
    • B21B2267/06—Roll diameter
    • 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

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

Abstract

PURPOSE: A method for controlling roll gap of a cold mill is provided to improve the quality of thickness degree and actual yield by reducing the difference in the settled value and the actual value. CONSTITUTION: A method for controlling roll gap of a cold mill includes the steps of calculating roll gap based on the quantity of loss related to the thickness before and after pickling(71), operating a lower push-up cylinder of the mill if the next coil enters a stand in case of the next set-up transmission condition(72-75), measuring the thickness deviation of the outlet of the mill(76), judging whether the calculated thickness deviation is out of a permitted limit(77), and operating the cylinder to make the thickness deviation within the permitted limit if the calculated thickness deviation is out of the permitted limit, otherwise, terminating roll gap control(78).

Description

냉간압연기 롤갭 제어방법{METHOD FOR CONTROLLING GAP OF ROLLS IN COLD MILL}Cold rolling mill roll gap control method {METHOD FOR CONTROLLING GAP OF ROLLS IN COLD MILL}

본 발명은 냉간압연기 롤갭 제어방법에 관한 것으로, 특히 열연정보두께와 핫코일 실측두께와의 편차에 의해 초래되는 압연기의 롤갭 설정치 오차를 최소화시키기 위해서, 종래의 열연정보두께 대신에 산세의 입측의 두께측정기 실적과 장력측정기의 연신율 실적, 그리고 산세시 열연 스케일 손실량을 고려한 소재두께를 롤갭 계산에 도입함으로써, 소재두께 설정치와 실적치와의 차이를 없애 두께정도 품질을 향상시킬 수 있음은 물론, 실수률을 향상시킬 수 있는 냉간압연기 롤갭 제어방법에 관한 것이다.The present invention relates to a cold rolling mill roll gap control method, in particular, to minimize the roll gap set value error of the rolling mill caused by the deviation between the hot rolled information thickness and the hot coil measurement thickness, the thickness measuring device of the pickling side instead of the conventional hot rolled information thickness By adopting the thickness of the roll gap calculation by considering the performance, the elongation performance of the tension gauge, and the amount of hot rolled scale loss during pickling, the gap between the material thickness setting value and the performance value can be eliminated and the quality of the thickness can be improved. The present invention relates to a cold rolling mill roll gap control method.

일반적인 냉간압연 공정이 도1에 도시되어 있으며, 도 1을 참조하면, 일반 냉간압연 공정은 롤에 감겨진 강판이 풀리면서 이송장치에 의해서 냉간압연기로 이송되는데, 이 이송장치에는 복수의 이송롤이 설치되어 있으며, 이 이송롤에 의해서 이송되는 과정에서, 강판에 대한 두께가 두께측정기(11)에 의해서 측정되고, 장력측정기(tension leveler)(12)에 의해서 강판의 장력이 측정되며, 그리고 산세탱크(13)에 의한 산세과정을 통해서 강판 표면상의 산화물등의 이물질이 제거된다.A general cold rolling process is shown in FIG. 1, and referring to FIG. 1, in the general cold rolling process, a steel sheet wound on a roll is unwound and is transferred to a cold rolling mill by a conveying device. In the process of conveying by this feed roll, the thickness with respect to the steel plate is measured by the thickness gauge 11, the tension of the steel plate is measured by the tension leveler 12, and pickling tank The pickling process in (13) removes foreign substances such as oxides on the surface of the steel sheet.

이러한 연속압연기에서는, 두께, 폭, 강종등이 변하는 경우에 바람직하지 않은 오프-게이지(off-gauge)가 도 4에 도시된 바와같이, 코일 탑부에서 현저하게 발생하는데, 이와같은 오프-게이지의 길이는 압연전 연속압연기의 각 스탠드에 설치되는 압연 셋업의 정도에 의존하므로, 이 오프-게이지의 길이를 줄이기 위해서는 정확한 압연 셋업이 절대적으로 필요하다. 여기서, 상기한 압연 셋업이란 롤갭을 제어하기 위해, 압연전 연속압연기의 각 스탠드에 설정되는 압연기의 롤속도 및 롤갭등을 계산하는 것을 말한다,In such a continuous mill, undesirable off-gauge occurs in the coil top as shown in FIG. 4 when the thickness, width, steel grade, etc. change, and the length of such off-gauge Since depends on the degree of rolling setup installed on each stand of the continuous mill before rolling, an accurate rolling setup is absolutely necessary to reduce the length of this off-gauge. Here, in order to control a roll gap, said rolling setup means calculating the roll speed, roll gap, etc. of the rolling mill set to each stand of the continuous rolling mill before rolling,

상기 압연기의 롤속도는 소재의 조건에 따라 설정되기 때문에, 이 롤속도가 상기 오프-게이지에 영향을 거의 미치지 않지만, 상기 롤갭은 압연기에 의한 압연강판의 두께에 직접적으로 영향을 미치므로, 이 롤갭의 오차는 곧바로 오프-게이지를 발생시키는 요인이 된다, 따라서, 상기 오프-게이지가 가능한 한 적게 되도록 하여야 하고, 이를 위해서는 롤갭의 정확한 계산이 필요하다.Since the roll speed of the rolling mill is set according to the conditions of the raw material, this roll speed has little influence on the off-gauge, but since the roll gap directly affects the thickness of the rolled steel sheet by the rolling mill, this roll gap The error of is immediately a factor causing off-gauge, therefore, the off-gauge should be made as small as possible, which requires accurate calculation of the roll gap.

도 2는 일반적인 냉간압연 셋업 흐름도로서, 도 2를 참조하면, 21단계에서의 각 스탠드간 두께 및 판속도를 22단계에서 변형저항식에 적용하고, 이후, 23단계에서 압연하중을 계산한후, 24단계에서 압하위치를 계산한다. 마지막으로, 25단계에서 롤갭을 설정한다.FIG. 2 is a general cold rolling setup flow chart. Referring to FIG. 2, the thickness and the plate speed between each stand in step 21 are applied to the deformation resistance equation in step 22, and after calculating the rolling load in step 23, In step 24, the pressing position is calculated. Finally, in step 25, the roll gap is set.

도 3은 종래의 롤갭 설정과정을 보이는 플로우챠트로서, 도 3을 참조하면, 31단계에서, 상위컴퓨터가 열연정보두께 및 소재정보를 입력받고, 32단계에서 압연하중(Pi) 초기치를 가정하며, 33단계에서 편평롤 반경을 계산(Hitchcock 식에 의해)한후, 34,35단계에서 마찰계수 계산 및 이에 대한 보정을 수행한다.FIG. 3 is a flowchart illustrating a conventional roll gap setting process. Referring to FIG. 3, in step 31, a host computer receives a hot rolled information thickness and material information, and assumes an initial rolling load Pi in step 32. In step 33, the flat roll radius is calculated (by Hitchcock's equation), and in steps 34 and 35, friction coefficients are calculated and corrected.

다음, 36단계에서 하기 식1에 의해 압연하중을 계산하는데, 최종적으로 롤갭을 계산하기 전에, 압연하중을 계산하여야 하며, 이 압연하중 계산은 하기 수학식1에 보인 바와같이, 열연정보 두께(HI)가 포함되어 있으며, 여기서, 열연정보두께(HI)외의 항목은 실측값이므로 압연하중 계산은 열연정보두께(HI)에 의해서 좌우된다는 것을 알 수 있다.Next, in step 36, the rolling load is calculated by Equation 1 below, and finally, before calculating the roll gap, the rolling load must be calculated, and the rolling load calculation is performed as shown in Equation 1 below. In this case, since items other than the hot rolled information thickness HI are measured values, it can be seen that the rolling load calculation depends on the hot rolled information thickness HI.

여기서, Pi는 압연하중, ki는 변형저항, Ki는 장력효과, Dpi는 마찰계수 보정항, b는 판폭, R'i는 편평롤경, Hi는 열연정보두께, 그리고 hi는 I스탠드 출측 두께이다.Where Pi is rolling load, ki is deformation resistance, Ki is tension effect, Dpi is friction coefficient correction term, b is plate width, R'i is flat roll diameter, Hi is hot rolled thickness, and hi is I stand exit thickness.

마지막으로, 37단계에서 하기 수학식2에 의해 롤갭을 설정하는데, 상기 수학식1에서 구한 압연하중에 기초하여 하기 수학식2를 이용하여 롤갭 설정량을 구할 수 있다.Finally, in step 37, the roll gap is set by Equation 2 below, and the roll gap setting amount may be obtained using Equation 2 based on the rolling load obtained by Equation 1 above.

여기서, S는 각 압연기 롤갭, Pi는 압연하중, M은 압연기 탄성계수, 그리고 hi는 i스탠드 출측 두께이다.Where S is the rolling gap of each mill, Pi is the rolling load, M is the elastic modulus of the mill, and hi is the i-stand exit thickness.

이와같은 종래의 방법에 의한 핫코일 길이방향 두께성향은 도 4에 도시되어 있으며, 냉연에서 요구되는 두께로 열간압연의 정상구간인 중간부(middle portion)에서는 냉연요구두께와 열연정보 두께가 거의 비슷하지만, 핫코일의 선두부(top portion)의 경우에는 20mm이상의 오차가 발생하여 냉연에서 오프-게이지 발생의 주요영향 인자로 작용한다. 이 냉간압연기의 롤갭계산은 핫코일의 정상구간인 중간부 두께를 기준으로 계산하기 때문에 핫코일 선두부 두께오차는 그대로 롤갭 오차로 되어 제품의 오프-게이지로 발생되는데, 도 4를 참조하면, 핫코일의 길이방향에 대한 두께성향을 보면, 핫코일의 중간부는 변화폭의 거의 일정한 반면에, 핫코일의 선두부와 후미부(tail portion)는 변화폭이 심하다. 여기서, 롤갭 설정오차에 의한 오프-게이지(off-gauge)는 도5에 도시된 바와같이 발생된다.The thickness of the hot coil longitudinal direction by the conventional method is shown in Figure 4, the thickness required for cold rolling in the middle portion (middle portion) of the normal section of hot rolling, but the thickness of the cold rolling request and the thickness of the hot rolled information is almost the same In the case of the top portion of the hot coil, an error of 20 mm or more occurs, which acts as a major influence factor of off-gauge generation in cold rolling. Since the roll gap calculation of this cold rolling mill is calculated based on the thickness of the middle part, which is the normal section of the hot coil, the thickness error of the head of the hot coil is caused by the roll gap error as it is, resulting in the off-gauge of the product. Referring to FIG. In terms of the thickness tendency of the direction, the middle portion of the hot coil is almost constant in the change width, while the head portion and the tail portion of the hot coil change in the range. Here, off-gauge due to roll gap setting error is generated as shown in FIG.

이와같은 종래의 롤갭 설정방법에 있어서, 롤갭 계산에 이용되는 열연정보 두께와 핫코일 실측두께와의 편차로 인한 롤갭 계산은 다음과 같은 문제점이 있다.In such a conventional roll gap setting method, the roll gap calculation due to the deviation between the hot rolled information thickness and the hot coil measured thickness used for the roll gap calculation has the following problems.

먼저, 상기 수학식1에 있어서, 압연하중은 다른 압연조건이 일정하다고 하면, 열연정보두께(Hi)에 정비례한다. 그러나, 앞에서 열연정보두께의 문제점에 대해서 언급한 바와같이, 열연소재의 실측두께는 롤갭 계산에 이용되는 열연정보두께와 핫코일 중간부에서 50μm정도의 편차, 핫코일 선두부에서는 200μm이상 편차가 발생하기 때문에, 압연하중 오차가 필연적으로 발생하게 되는 것이다. 이와같이 압연하중 오차에 의해서 롤갭설정에 오차를 초래시키는 문제점이 있다.First, in Equation 1, the rolling load is directly proportional to the hot rolled information thickness Hi, provided that the other rolling conditions are constant. However, as mentioned above, the actual thickness of the hot rolled material has a deviation of about 50 μm from the middle of the hot coil and the thickness of the hot coil used for the roll gap calculation, and a deviation of 200 μm or more from the head of the hot coil. The rolling load error will inevitably occur. As such, there is a problem of causing an error in the roll gap setting due to the rolling load error.

또한, 상기 수학식2에 있어서, 상기 수학식1에서 구한 압연하중 오차분이 구대로 롤갭 설정치의 계산오차로 발생하는 관계로, 이와같은 열연정보두께와 핫코일 실측두께와의 오차가 클수록 오프-게이지 길이가 많이 발생할 수 밖에 없는 문제점이 있었던 것이다.Further, in Equation 2, since the rolling load error obtained in Equation 1 is generated as a calculation error of the roll gap set value as a sphere, the larger the error between the hot rolled information thickness and the hot coil actual thickness, the longer the off-gauge length. There was a problem that can only occur a lot.

본 발명은 상기한 문제점을 해결하기 위해 안출한 것으로, 따라서, 본 발명의 목적은 롤갭의 정확한 계산의 위해 냉연 산세 입측의 두께측정 실적, 장력측정기의 연신율실적, 그리고 산세시 열연 스케일 손실량을 고려한 소재두께를 롤갭계산에 반영하여 롤갭 예측정도를 향상시켜 오프-게이지를 줄일 수 있도록 하는 냉간압연기 롤갭 제어방법을 제공하는데 있다.The present invention has been made to solve the above problems, and therefore, an object of the present invention is to take into account the thickness measurement results of cold pickling side, the elongation performance of the tension gauge, and the amount of hot rolled scale loss during pickling for accurate calculation of roll gap. The present invention provides a cold rolling mill roll gap control method for reducing the off-gauge by improving the roll gap prediction by reflecting the thickness in the roll gap calculation.

도 1은 일반적인 냉간압연 공정도이다.1 is a general cold rolling process.

도 2는 일반적인 냉간압연 셋업 흐름도이다.2 is a general cold rolling setup flow chart.

도 3은 종래의 롤갭 설정과정을 보이는 플로우챠트이다.3 is a flowchart showing a conventional roll gap setting process.

도 4는 핫코일 길이방향 두께성향을 보이는 그래프이다.4 is a graph showing the hot coil longitudinal thickness tendency.

도 5는 롤갭 설정오차에 의한 오프-게이지(off-gauge) 발생 설명도이다.5 is an explanatory diagram of off-gauge generation due to a roll gap setting error.

도 6은 본 발명을 수행하기 위한 롤갭 제어장치의 구성도이다.6 is a block diagram of a roll gap control apparatus for carrying out the present invention.

도 7은 본 발명에 따른 롤갭 제어방법을 보이는 플로우챠트이다.7 is a flowchart showing a roll gap control method according to the present invention.

도 8은 도 7의 롤갭 설정과정을 보이는 플로우챠트이다.FIG. 8 is a flowchart illustrating a roll gap setting process of FIG. 7.

도 9는 본 발명과 종래의 롤갭제어에 따른 각 두께성향을 비교하기 위한 그래프이다.9 is a graph for comparing each thickness tendency according to the present invention and the conventional roll gap control.

* 도면의 주요부분에 대한 부호의 설명 *Explanation of symbols on the main parts of the drawings

61 : 상위컴퓨터 62 : 두께측정기61: upper computer 62: thickness meter

63 : 프로그램로직제어기 63a : 오차계산부63: program logic controller 63a: error calculation unit

63b : 롤갭보상부 63c : 롤갭제어부63b: roll gap compensation unit 63c: roll gap control unit

WR : 작업롤 MR : 중간롤WR: Work roll MR: Intermediate roll

BR : 백업롤BR: Backup Roll

상기한 본 발명의 목적을 달성하기 위한 기술적인 수단으로써, 본 발명의 방법은 산세 전후의 두께에 대한 손실량에 기초해서 롤갭을 계산하는 제1단계; 다음 셋업 전송조건일 경우, 다음 코일이 스탠드 진입시 압연기의 하부 푸쉬업 실린더를 동작시키는 제2단계; 압연기 출측의 두께편차를 측정하는 제3단계; 제3단계에서 계산된 두께편차가 허용범위를 벗어나는가를 판단하여, 벗어나는 경우에는 상기 제2단계로 진행하여 실린더를 동작시켜 두께편차가 허용범위 이내로 되도록 수행하고, 벗어나지 않을 경우에는 롤갭 제어를 종료하는 제4단계; 로 이루어짐을 특징으로 한다.As a technical means for achieving the above object of the present invention, the method of the present invention comprises the steps of: calculating a roll gap based on a loss amount for the thickness before and after pickling; A second step of operating the lower push-up cylinder of the rolling mill when the next coil enters the stand when it is the next setup transmission condition; A third step of measuring a thickness deviation of the exit side of the rolling mill; It is determined whether the thickness deviation calculated in the third step is out of the allowable range. If the deviation is out of the allowable range, the process proceeds to the second step to operate the cylinder so that the thickness deviation is within the allowable range. The fourth step; Characterized in that made.

이하, 본 발명에 따른 냉간압연기 롤갭 제어장치에 대해서 첨부한 도면을 참조하여 상세하게 설명한다.Hereinafter, a cold rolling mill roll gap control apparatus according to the present invention will be described in detail with reference to the accompanying drawings.

도 6은 본 발명을 수행하기 위한 롤갭 제어장치의 구성도로서, 도 6을 참조하면, 본 발명을 수행하기 위한 냉간압연기 롤갭 제어장치는 산세 전후의 두께를 측정하는 두께측정기(62)와, 상기 두께측정기(62)로부터의 두께정보에 기초해서 산세 전후의 두께손실량을 계산하고, 이 두께손실량을 이용하여 롤갭 변경량(△S)을 계산하여 롤갭의 제어를 명령하는 상위컴퓨터(61)와, 상기 상위컴퓨터(61)로부터의 롤갭 제어명령에 따라 푸쉬업 실린더(64)를 제어하면서, 상기 두께측정기(62)로부터의 두께정보에 기초한 편차를 이용하여 상기 상위컴퓨터(61)로부터의 롤갭을 보정하여 롤갭편차가 허용범위 이내로 되도록 다시 푸쉬업 실린더의 동작을 조절하는 과정을 통해서 롤갭을 제어하는 프로그램로직제어기(63)를 포함한다.6 is a configuration diagram of a roll gap control device for carrying out the present invention. Referring to FIG. 6, a cold rolling mill roll gap control device for carrying out the present invention includes a thickness gauge 62 for measuring thickness before and after pickling, and A host computer 61 which calculates the thickness loss amount before and after pickling based on the thickness information from the thickness gauge 62, calculates the roll gap change amount? S using this thickness loss amount, and instructs the roll gap control; While controlling the push-up cylinder 64 according to the roll gap control command from the host computer 61, the roll gap from the host computer 61 is corrected using the deviation based on the thickness information from the thickness gauge 62. And a program logic controller 63 for controlling the roll gap by adjusting the operation of the push-up cylinder again so that the roll gap deviation is within the allowable range.

상기 프로그램로직제어기(63)는 상기 두께측정기(62)의 두께실측치(hact)와 두께설정치(href)와의 오차(△h=href-hact)를 계산하는 오차계산부(63a)와, 상기 오차계산부(63a)로부터의 롤갭오차에 기초해서 롤갭설정을 보상하는 롤갭보상부(63b)와, 상기 상위컴퓨터(61)로부터의 롤갭설정 및 상기 롤갭보상부(63b)로부터의 롤갭보상량으로 롤갭의 최종 제어량을 산출하여 상기 푸쉬업 실린더(64)의 동작을 제어하는 롤갭제어부(63c)를 포함한다.The program logic controller 63 includes an error calculator 63a that calculates an error (Δh = href-hact) between the thickness measurement value hact and the thickness setting value href of the thickness meter 62, and the error calculation unit. The roll gap compensation unit 63b compensates for the roll gap setting based on the roll gap error from the unit 63a, the roll gap setting from the host computer 61 and the roll gap compensation amount from the roll gap compensation unit 63b. Roll gap control unit 63c for controlling the operation of the push-up cylinder 64 by calculating the final control amount.

도 7은 본 발명에 따른 롤갭 제어방법을 보이는 플로우챠트이고, 도 8은 도 7의 롤갭 설정과정을 보이는 플로우챠트이다. 그리고, 도 9는 본 발명과 종래의 롤갭제어에 따른 각 두께성향을 비교하기 위한 그래프이다.7 is a flowchart showing a roll gap control method according to the present invention, Figure 8 is a flow chart showing a roll gap setting process of FIG. 9 is a graph for comparing each thickness tendency according to the present invention and the conventional roll gap control.

여기서, 도면중 미설명부호인 WR는 작업롤이고, MR는 중간롤이며, BR는 백업롤이다.Here, WR, which is not described in the drawings, is a work roll, MR is an intermediate roll, and BR is a backup roll.

이와같이 구성된 본 발명에 따른 동작을 첨부도면에 의거하여 하기에 상세히 설명한다.Operation according to the present invention configured as described above will be described in detail below based on the accompanying drawings.

본 발명은 열연정보두께와 핫코일 실측두께와의 편차에 의해 초래되는 압연기의 롤갭 설정치 오차를 최소화시키기 위해서, 종래의 열연정보두께 대신에 산세의 입측의 두께측정기 실적과 장력측정기의 연신율 실적, 그리고 산세시 열연 스케일 손실량을 고려한 소재두께를 롤갭 계산에 도입함으로써, 소재두께 설정치와 실적치와의 차이를 없애 두께정도 품질을 향상시킬 수 있음은 물론, 실수률을 향상시키는 것으로, 이에 대해서 상세히 설명하면 다음과 같다.The present invention, in order to minimize the roll gap set value error of the rolling mill caused by the deviation between the hot rolled information thickness and hot coil measurement thickness, instead of the conventional hot rolled information thickness, the thickness measuring instrument performance of the pickling side and the elongation performance of the tension meter, and pickling By introducing the material thickness in consideration of the hot rolling scale loss in the roll gap calculation, it is possible to eliminate the difference between the material thickness setting value and the performance value, thereby improving the quality of the thickness and of course improving the error rate. same.

도 6 내지 도9를 참조하여 본 발명을 설명하면, 먼저, 도 6 및 도 7을 참조하면, 제1단계(71)에서는 두께측정기(62)에 의한 두께에 기초해서 산세 전후의 두께 손실량을 산출하고, 이 산출된 두께 손실량을 이용하여 롤갭을 계산하는데, 이에 대해서 도 8을 참조하여 구체적으로 설명하면 다음과 같다.6 to 9, first, referring to FIGS. 6 and 7, in the first step 71, the thickness loss amount before and after pickling is calculated based on the thickness by the thickness meter 62. Then, the roll gap is calculated using the calculated thickness loss amount, which will be described in detail with reference to FIG. 8.

도 8을 참조하면, 상기 제1단계(71)에 있어서, 제1-1단계(71-1)에서는 두께측정기(62)에 의해 코일에 대한 전장의 두께를 측정하고, 제1-2단계(71-2)에서는 장력측정기(tension leveler)에 의해 실측 연신율을 측정하여 프로그램로직제어기(63) 및 상위컴퓨터(61)로 전송한다.Referring to FIG. 8, in the first step 71, in the first-first step 71-1, the thickness of the electric field with respect to the coil is measured by the thickness meter 62, and the first-second step ( In 71-2), the measured elongation is measured by a tension leveler and transmitted to the program logic controller 63 and the host computer 61.

다음, 제1-3단계(71-3)에서는 상기 제1-2단계(71-2)에서 측정한 두께를 이용하여, 산세 전후의 두께 손실량을 계산하는데, 이 산세 전후의 두께 손실량은 두께 및 강종별 산세시 두게 손실량을 측정하여야 한다. 본 발명에 따른 데이타 수집을 위한 실시예로서, 수집대상은 4냉연공장으로 하고, 수집방법은 핫코일두께, 산세속도, 및 압연기 입측 두께등에 대해서 25스캔/초 주기로 수행하는 마이크로 데이타수집장치를 이용하였으며, 데이타 수집결과는 하기 표1에 보인 바와같다.Next, in step 1-3-3, the thickness loss amount before and after pickling is calculated using the thickness measured in step 1-2-2. Losses should be measured during pickling by steel type. As an embodiment for data collection according to the present invention, the object to be collected is a four cold rolling mill, and a collection method uses a micro data collection device that performs 25 scans / sec cycle for hot coil thickness, pickling speed, and rolling mill side thickness. The data collection results are shown in Table 1 below.

N0.N0. 두께thickness 폭width 강종Steel grade 재생산공급량Reproduction Supply 산세속도(MPM)Pickling speed (MPM) 산세전후 두께감소(μm)Thickness reduction before and after pickling (μm) 선두부Head 최대속도Speed 선두부Head 중간부Middle section 후미부Tail 1One 0.8050.805 18651865 HWU4007KTiWHWU4007KTiW 9m2/hr9m 2 / hr 100100 150150 7070 80∼10080-100 100100 22 0.8050.805 14641464 HWU2015ZTiHWU2015ZTi 9m2/hr9m 2 / hr 130130 150150 70∼10070-100 100100 100100 33 0.8080.808 13841384 HWU4007KTiWHWU4007KTiW 10m2/hr10m 2 / hr 140140 180180 7070 100100 100100 44 0.8080.808 13841384 HWU4007KTiWHWU4007KTiW 10m2/hr10m 2 / hr 130130 180180 100100 100100 100100 55 0.9050.905 15331533 HWU4007KTiWHWU4007KTiW 9m2/hr9m 2 / hr 150150 150150 7070 120120 100100 66 1.0111.011 961961 HWU4007KTiWHWU4007KTiW 7m2/hr7m 2 / hr 160160 220220 120120 120120 100100 77 1.4211.421 16591659 HWU5060ZPTHWU5060ZPT 7m2/hr7m 2 / hr 90→2090 → 20 200200 100∼120100-120 100∼120100-120 100∼120100-120 88 0.1850.185 942942 HWU4007KTiWHWU4007KTiW 7m2/hr7m 2 / hr 160160 200200 8080 120120 120120 99 1.1971.197 937937 HWU4025EHWU4025E 7m2/hr7m 2 / hr 130130 200200 7070 100100 100100 1010 1.2161.216 13021302 HWU4007KTiWHWU4007KTiW 7m2/hr7m 2 / hr 110110 200200 100100 100100 100100

상기 표1에 보인 바와같이, 산세시 두께 손실량 측정결과에 있어서, 산세전후 두께 감소량은 약100μm정도이며, 두께, 폭, 강종, 산세속도에 따른 산세전후 두께 감소량에는 차이가 거의 없음을 알 수 있다. 여기서, 두께 감소량은 T/L 연신율(연신율 1.2%, 약 47μm 두께감소(4톤기준) 및 스케일층 제거에 의한 것으로 산세시 두께 손실량은 산세전후 전체 두께 손실량(100μm)에서 T/L 연신율에 의한 두께감소량만 빼주면 산세시 두께 손실량을 구할 수 있다.As shown in Table 1, in the measurement of the thickness loss during pickling, the thickness decrease before and after pickling is about 100 μm, and there is almost no difference in the thickness reduction before and after pickling according to thickness, width, steel grade, and pickling speed. . Here, the thickness reduction amount is due to T / L elongation (1.2% elongation, about 47μm thickness reduction (4 ton basis) and scale layer removal, and the thickness loss during pickling is determined by the T / L elongation at the total thickness loss (100μm) before and after pickling. By subtracting the thickness reduction, you can get the thickness loss during pickling.

그리고, 제1-4단계(71-4)에서는 열연정보두께(Hi)를 계산하는데, 이는 하기 수학식3에 의해서 구한다.In the first to fourth steps 71-4, the hot-rolled information thickness Hi is calculated by Equation 3 below.

이후, 제1-5단(71-5)계에서는 압연하중 초기치를 설정하고, 편평롤 반경, 마찰계수 및 압연하중을 계산하고, 그리고 제1단계(71)의 마지막단계로서, 제1-6단계(71-6∼71-9)에서는 롤갭을 계산하는데, 이 롤갭 변경량은 하기 수학식4에 의해 구한다.Subsequently, in the 1-5 stage 71-5 system, the initial rolling load is set, the flat roll radius, the friction coefficient, and the rolling load are calculated, and as the last step of the first step 71, the first-6 In steps 71-6 to 71-9, a roll gap is calculated, and this roll gap change amount is calculated by the following equation.

여기서, △S는 압하위치 변경량이고, S1은 현재 압연재의 롤갭량이며, S2는 다음 압연재의 롤갭량이다.(DELTA) S is a rolling position change amount, S1 is a roll gap amount of a present rolling material, and S2 is a roll gap amount of a next rolling material.

그리고, 제2단계(72∼75)에서는 상기한 롤갭 변경량은 다음 셋업 전송조건일 경우, 즉 현재압연길이 1/3이상, 현재 압연중인 코일의 설정속도 30%이상, 속도유지시간 10초이상일 경우, 상위컴퓨터는 롤갭을 프로그램로직제어기로 전송한다. 이프로그램로직제어기는 설정롤갭을 수신받은후, 다음 코일이 스탠드 진입시 압연기의 하부 푸쉬업 실린더를 동작시켜 롤갭 변경량을 제어한다.In the second step (72 to 75), the roll gap change amount is the following setup transmission condition, that is, the current rolling length is 1/3 or more, the set speed of the coil currently being rolled is 30% or more, and the speed holding time is 10 seconds or more. In this case, the host computer sends the roll gap to the program logic controller. The program logic controller receives the set roll gap and controls the roll gap change amount by operating the lower push-up cylinder of the rolling mill when the next coil enters the stand.

제3단계(76)에서는 냉간압연기 출측에 설치된 두께측정기에 의해 압연기 출측에서 설정치와의 두께편차를 측정한다.In the third step 76, the thickness deviation from the set point is measured at the exit side of the rolling mill by a thickness gauge installed at the exit side of the cold rolling mill.

마지막으로, 제4단계(77,78)에서는 제3단계(76)에서 계산된 두께편차가 허용범위를 벗어나는가를 판단하여, 벗어나는 경우에는 상기 제2단계로 진행하여 상기 제2단계(75)와 제3단계(76)를 반복적으로 수행하여 롤갭을 피드백방식으로 제어하다가, 상기 두께편차가 허용범위이내, 예를들어, 거의 "영(zero)"가 되는 경우에는 롤갭 제어를 종료한다.Finally, in the fourth step (77, 78), it is determined whether the thickness deviation calculated in the third step (76) is out of the allowable range, and if so, proceeds to the second step and the second step (75) The roll gap is controlled in a feedback manner by repeatedly performing the third step 76, and the roll gap control is terminated when the thickness deviation is within an allowable range, for example, almost zero.

상술한 바와같은 본 발명에 따르면, 종래의 열연정보두께 대신에 산세 입측의 두께측정기 실적과 장력측정기 연신율 실적, 그리고 산세시 열연 스케일 손실량을 고려한 소재두께를 롤갭 계산에 도입함으로서, 롤갭 예측오차를 최소화시켜 두께품질을 향살시킬 수 있게 된다.According to the present invention as described above, the roll gap calculation error is minimized by introducing the thickness thickness of the pickling side, the tension meter elongation, and the thickness of the hot rolled scale during pickling, instead of the conventional hot rolled information thickness. To improve thickness quality.

도 9에 도시한 바와같이, 도 19a는 본 발명에 의한 방법을 적용한 경우에 해당되고, 도 19b는 종래의 발명을 적용한 경우에 해당되는 것으로서, 도 19a와 도19b를 비교해 보면, 각 스탠드별 용접부에서 두께편차가 상당히 작음을 알 수 있다.As shown in FIG. 9, FIG. 19A corresponds to the case where the method according to the present invention is applied, and FIG. 19B corresponds to the case where the conventional invention is applied. Compared with FIG. 19A and FIG. It can be seen that the thickness deviation is quite small at.

상술한 바와같은 본 발명에 따르면, 열연정보두께와 핫코일 실측두께와의 편차에 의해 초래되는 압연기의 롤갭 설정치 오차를 최소화시키기 위해서, 종래의 열연정보두께 대신에 산세의 입측의 두께측정기 실적과 장력측정기의 연신율 실적, 그리고 산세시 열연 스케일 손실량을 고려한 소재두께를 롤갭 계산에 도입함으로써, 소재두께 설정치와 실적치와의 차이를 없애 두께정도 품질을 향상시킬 수 있음은 물론, 실수률을 향상시킬 수 있는 특별한 효과가 있는 것이다.According to the present invention as described above, in order to minimize the roll gap set value error of the rolling mill caused by the deviation between the hot rolled information thickness and the hot coil measured thickness, the thickness measuring instrument performance and tension measuring instrument of the pickling side instead of the conventional hot rolled information thickness By adopting the material thickness considering the elongation performance and the amount of hot rolled scale loss during pickling, the gap between the material thickness setting value and the performance value can be eliminated and the quality of the thickness can be improved as well as the error rate can be improved. It works.

이상의 설명은 본 발명의 일실시예에 대한 설명에 불과하며, 본 발명은 그 구성의 범위내에서 다양한 변경 및 개조가 가능하다.The above description is only a description of one embodiment of the present invention, the present invention is capable of various changes and modifications within the scope of the configuration.

Claims (2)

산세 전후의 두께에 대한 손실량에 기초해서 롤갭을 계산하는 제1단계(71);A first step 71 of calculating a roll gap based on a loss amount for the thickness before and after pickling; 다음 셋업 전송조건일 경우, 다음 코일이 스탠드 진입시 압연기의 하부 푸쉬업 실린더를 동작시키는 제2단계(72∼75);A second step 72 to 75 for operating the lower push-up cylinder of the rolling mill when the next coil enters the stand when the next setup transmission condition is met; 압연기 출측의 두께편차를 측정하는 제3단계(76);A third step 76 of measuring a thickness deviation of the exit side of the rolling mill; 제3단계에서 계산된 두께편차가 허용범위를 벗어나는가를 S판단하여, 벗어나는 경우에는 상기 제2단계로 진행하여 실린더를 동작시켜 두께편차가 허용범위 이내로 되도록 수행하고, 벗어나지 않을 경우에는 롤갭 제어를 종료하는 제4단계(77,78); 로 이루어짐을 특징으로 하는 냉간압연기 롤갭 제어방법.Determining whether the thickness deviation calculated in the third step is out of the allowable range, if it is out, proceed to the second step to operate the cylinder so that the thickness deviation is within the allowable range, and if not, the roll gap control is terminated. The fourth step (77, 78); Cold rolling mill roll gap control method characterized in that consisting of. 제1항에 있어서, 상기 제1단계(71)는The method of claim 1, wherein the first step 71 두께측정기로 핫코일에 대한 전장의 두께를 측정하는 제1-1단계(71-1);Step 1-1 (71-1) for measuring the thickness of the electric field for the hot coil with a thickness meter; 장력측정기로 실측 연신율을 측정하는 제1-2단계(71-2);Step 1-2 (71-2) of measuring the measured elongation with a tension meter; 상기 제1단계(71-1)의 두께정보와 제2단계(71-2)의 연신율을 이용하여, 산세 전후의 두께 손실량을 계산하는 제1-3단계(71-3);A first to third steps 71-3 calculating the amount of thickness loss before and after pickling by using the thickness information of the first step 71-1 and the elongation of the second step 71-2; 연신율에 의한 두께감소량과 산세 손실량을 이용하여 열연정보두께를 계산하는 제1-4단계(71-4);A first to fourth steps 71-4 of calculating the hot-rolled information thickness using the thickness reduction amount and the pickling loss amount due to the elongation; 압연하중 초기치를 설정하고, 편평롤 반경, 마찰계수 및 압연하중을 계산하는 제1-5단계(71-5);A first to fifth step (71-5) of setting an initial value of a rolling load and calculating a flat roll radius, a coefficient of friction, and a rolling load; 현재 압연재의 롤갭과 다음 압연재의 롤갭을 이용하여 롤갭변경량을 계산하는 제1-6단계(71-6∼71-9);를 포함함을 특징으로 하는 냉간압연기 롤갭 제어방법.Cold roll mill control method comprising a; 1-6 step (71-6 ~ 71-9) for calculating the roll gap change amount using the roll gap of the current rolling material and the roll gap of the next rolling material.
KR10-1999-0061554A 1999-12-24 1999-12-24 Method for controlling gap of rolls in cold mill KR100431843B1 (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100711407B1 (en) * 2005-12-26 2007-04-30 주식회사 포스코 Method for adjusting the roll gap of single stand reversing mill
KR102098506B1 (en) * 2018-11-30 2020-04-07 주식회사 포스코 Method for setting roll-gap of roll leveler
CN114789198A (en) * 2021-10-14 2022-07-26 天津市新宇彩板有限公司 Method and system for improving vibration belt breakage of main oil cylinder of cold rolling mill

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Publication number Priority date Publication date Assignee Title
KR101518569B1 (en) * 2013-08-09 2015-05-15 주식회사 포스코 A PCM facility and a rolling condition setting method of the same

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Publication number Priority date Publication date Assignee Title
JPH04262815A (en) * 1991-02-18 1992-09-18 Sumitomo Metal Ind Ltd Method for setting roll gap of rolling mill
JPH0647419A (en) * 1992-07-30 1994-02-22 Kawasaki Steel Corp Method for controlling plate thickness in plate rolling
JP2697545B2 (en) * 1993-01-29 1998-01-14 住友金属工業株式会社 Roll gap setting method for rolling mill
KR19990040402A (en) * 1997-11-18 1999-06-05 이구택 Cold Rolling Roller Control Method

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100711407B1 (en) * 2005-12-26 2007-04-30 주식회사 포스코 Method for adjusting the roll gap of single stand reversing mill
KR102098506B1 (en) * 2018-11-30 2020-04-07 주식회사 포스코 Method for setting roll-gap of roll leveler
CN114789198A (en) * 2021-10-14 2022-07-26 天津市新宇彩板有限公司 Method and system for improving vibration belt breakage of main oil cylinder of cold rolling mill
CN114789198B (en) * 2021-10-14 2024-02-02 天津市新宇彩板有限公司 Method and system for improving vibration belt breakage of main oil cylinder of cold rolling mill

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