KR100497082B1 - Strip anti-bending control system in continous galvanizing line - Google Patents
Strip anti-bending control system in continous galvanizing line Download PDFInfo
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- KR100497082B1 KR100497082B1 KR10-1999-0057114A KR19990057114A KR100497082B1 KR 100497082 B1 KR100497082 B1 KR 100497082B1 KR 19990057114 A KR19990057114 A KR 19990057114A KR 100497082 B1 KR100497082 B1 KR 100497082B1
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- bending
- eddy current
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/14—Removing excess of molten coatings; Controlling or regulating the coating thickness
- C23C2/24—Removing excess of molten coatings; Controlling or regulating the coating thickness using magnetic or electric fields
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
- B05C11/02—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface
- B05C11/06—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface with a blast of gas or vapour
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/14—Removing excess of molten coatings; Controlling or regulating the coating thickness
- C23C2/16—Removing excess of molten coatings; Controlling or regulating the coating thickness using fluids under pressure, e.g. air knives
- C23C2/18—Removing excess of molten coatings from elongated material
- C23C2/20—Strips; Plates
Abstract
본 발명은 제철소의 용융도금공정에 있어서 강판의 반곡을 방지하는 장치에 관한 것으로서, 우측 에어나이프(3) 상부에 와전류식 거리센서(21a),(21b),(21c)를 일정한 간격으로 설치하고, 중앙의 와전류식 거리센서(21b)와 동일한 위치에다 전자석(22b)를 설치함과 더불어 좌측 에어나이프(3')의 상부에 전자석(22a),(22c)을 설치하며, 상기 와전류식 거리센서(21a),(21b),(21c)에다 반곡연산기(23)와 반곡제어기(24)를 차례로 거쳐 상기 전자석(22a),(22b),(22c)을 연결한 구성으로 본 발명 용융도금공정에 있어서 강판의 반곡방지 제어장치에 의하면 강판의 반곡이 없어지고, 그에 따라 직선형 에어나이프를 사용하는 에어와이핑 방식의 도금량 조절에 있어서 강판의 폭방향으로 전후면 모두 균일하게 도금이 이루어지기 때문에 과도금 영역이 최소화 되어 도금재의 손실을 막을 수 있을 뿐만 아니라 도금 미달 부분이 사라지게 되어 제품불량이 감소하므로 제품의 실수율을 증가시키는 장점이 있는 것이다. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for preventing bending of steel sheet in a hot-dip galvanizing process, wherein eddy current distance sensors 21a, 21b, and 21c are installed at regular intervals on an upper part of the right air knife 3. In addition, the electromagnet 22b is installed at the same position as the central eddy current distance sensor 21b, and the electromagnets 22a and 22c are installed on the upper side of the left air knife 3 '. In the hot-dip galvanizing process of the present invention, the electromagnets 22a, 22b, and 22c are connected to (21a), (21b), and (21c) through a half-curve operator 23 and a half-curve controller 24, respectively. According to the anti-bending control device of the steel sheet, the bending of the steel sheet is eliminated, and accordingly, in the plating amount adjustment of the air wiping method using a straight air knife, the plating is performed uniformly in the width direction of the steel sheet, so that the plating is overplated. Minimized area prevents loss of plating material In addition, the under plating disappears and the product defect is reduced, thereby increasing the error rate of the product.
Description
본 발명은 제철소의 용융도금공정에 있어서 강판의 반곡을 방지하는 장치에 관한 것으로서, 특히 강판의 전후면 양쪽에 와전류식 거리센서와 전자석을 강판의 폭방향으로 일정거리를 두고 설치하여 세 지점에서 측정된 강판까지의 거리값을 이용하여 반곡의 크기를 최소화 하도록 각 전자석의 자력을 적절히 제어하는 용융도금공정에 있어서 강판의 반곡방지 제어장치에 관한 것이다.The present invention relates to a device for preventing bending of steel sheet in the hot-dip galvanizing process of steel mills. Especially, the eddy current distance sensor and the electromagnet are installed on both sides of the steel sheet at a predetermined distance in the width direction of the steel sheet and measured at three points. The present invention relates to an anti-bending control apparatus for a steel sheet in a hot-dip plating process for appropriately controlling the magnetic force of each electromagnet so as to minimize the size of the bending by using the distance to the finished steel sheet.
일반적으로 제철소에서 냉연공정 혹은 열연공정을 거쳐 만들어진 강판(1)은 도 1에 도시한 바와 같이 내식성을 향상시키기 위해 표면에 아연과 같은 도금재를 입히게 되는데 수요가의 주문량에 따라 목표하는 도금량이 정해져서 도 3에 나타낸 목표도금량기준선(11)에 가능한 맞추어서 도금이 되도록 하기 위해 에어나이프(3), (3')를 강판(1)의 전후면에 설치하여 강한 압력의 공기를 분사시켜 도 2에 나타낸 바와 같이 표면에 부착된 도금층(10)을 깍아내는 에어와이핑(air wiping) 방식을 이용한다. 에어와이핑 방식은 강판(1)에 부착되는 도금량을 조절하는 방식중에서 강판(1)의 표면 상태가 가장 양호한 방식으로 전 세계적으로 가장 많이 사용되는 방식이다. In general, the steel sheet (1) made through a cold rolling process or a hot rolling process in a steel mill is coated with a coating material such as zinc on the surface in order to improve the corrosion resistance as shown in Figure 1, the target plating amount is determined according to the order quantity of the demand Air knives 3 and 3 'are installed on the front and rear surfaces of the steel sheet 1 so as to be plated as closely as possible to the target plating reference line 11 shown in FIG. As described above, an air wiping method of scraping off the plating layer 10 attached to the surface is used. The air wiping method is a method used to control the amount of plating attached to the steel sheet 1 in a manner that the surface state of the steel sheet 1 is the most widely used worldwide.
강판(1)에 부착되는 도금량은 강판(1)의 이동속도와 공기의 분사압력, 에어나이프(3),(3')와 강판(1)간의 간격에 의해서 주로 결정되므로 강판(1)의 폭 방향으로 균일하게 도금이 되기 위해서는 강판(1)과 에어나이프(3),(3')의 간격이 균일해야 되는데 일반적으로 안정화롤(5)과 상부롤(6) 사이에 위치한 강판(1)의 폭방향 장력의 불균일성에 따른 반곡현상(9)의 발생으로 인해서 강판(1)의 폭방향으로 불균일한 도금이 이루어지며, 특히 이러한 반곡현상에서 반곡이 이루어지는 방향은 설비에 따라 다르지만 한쪽 방향으로만 이루어진다. The plating amount adhered to the steel sheet 1 is mainly determined by the moving speed of the steel sheet 1, the injection pressure of air, and the distance between the air knifes 3, 3 'and the steel sheet 1, so that the width of the steel sheet 1 is In order to be uniformly plated in the direction, the distance between the steel sheet 1 and the air knife 3 and 3 'must be uniform. Generally, the steel sheet 1 located between the stabilization roll 5 and the upper roll 6 Due to the occurrence of the semi-curve phenomenon 9 due to the nonuniformity of the tension in the width direction, non-uniform plating is performed in the width direction of the steel sheet 1, and in particular, the direction in which the semi-curve is made in such a semi-curve phenomenon varies depending on the equipment, but only in one direction. .
도 2는 강판(1)의 반곡으로 인해서 직선형태의 에어나이프(3),(3')를 이용하여 에어와이핑 할 경우에 발생하는 도금의 불균일성을 보여주는 한 예를 나타낸 것이다. 도 2의 상부 에어나이프(3)가 직선인데 반해서 강판(1)에 반곡이 발생함으로써 강판(1)의 중간부분이 가장자리 보다 도금이 많이 되어 목표도금량기준선(11)에 비하여 과도금영역(12)이 발생하고, 반면에 가장자리에서는 목표도금량기준선(11)에 비하여 도금미달부분(13)이 발생하게 되는데 이와 같은 도금결과를 강판(1)을 폈을때 도금량측정센서(8)로 측정한 것을 도 3에 나타냈다.Figure 2 shows an example showing the non-uniformity of plating generated when air wiping using the air knife (3), (3 ') of the straight form due to the semi-curve of the steel sheet (1). While the upper air knife 3 of FIG. 2 is a straight line, bending occurs in the steel sheet 1, so that the middle portion of the steel sheet 1 is plated more than the edges, so that the overplating region 12 is larger than the target plating amount reference line 11. On the other hand, at the edge of the plating plating portion 13 is generated compared to the target plating amount reference line 11, which is measured by the plating amount measuring sensor 8 when the steel sheet 1 is removed. Indicated.
상기한 강판(1)의 반곡을 없애는 종래의 기술로서 안정화롤(5)을 이용하는 방법이 있는 바 이는 안정화롤(5)의 위치를 강판(1)의 수직방향으로 적절히 조절하게 되면 강판(1)의 길이방향으로 장력이 발생하게 되어 강판(1)의 반곡현상을 완화시키는 것이다.As a conventional technique for eliminating the bending of the steel sheet 1, there is a method using the stabilizing roll 5, which is that when the position of the stabilizing roll 5 is properly adjusted in the vertical direction of the steel sheet 1, the steel sheet 1 The tension is generated in the longitudinal direction of the to reduce the bending phenomenon of the steel sheet (1).
그러나 이러한 종래의 방법은 운전자가 반곡의 유무를 육안으로 판단하여 수동으로 안정화롤(5)의 위치를 조금씩 조절하여 반곡을 잡아나가는 방식으로서 강판(1)의 두께와 강판(1)의 이동속도등의 변화에 따라 항상 안정화롤(5)의 위치를 조절해야 하는 번거로움과 길이방향의 장력이 반곡에 미치는 영향은 한계가 있기 때문에 반곡이 완전히 없어지지 않는 문제점이 있었다. However, in the conventional method, the driver judges the presence or absence of a semi-curve by the naked eye and manually adjusts the position of the stabilization roll 5 little by little to catch the semi-curve. The thickness of the steel sheet 1 and the moving speed of the steel sheet 1 are According to the change of the hassle to adjust the position of the stabilization roll (5) and the effect of the tension in the longitudinal direction is always limited because there is a problem that the semi-bending is not completely eliminated.
본 발명은 상기한 실정을 감안하여 종래의 강판 반곡방지방법에서 야기되는 각종 문제점들을 해결하고자 발명한 것으로서, 강판의 전후면 양쪽에 와전류식 거리센서와 전자석을 강판의 폭방향으로 일정거리를 두고 설치하여 세 지점에서 측정된 강판까지의 거리값을 이용하여 반곡의 크기를 최소화 하도록 각 전자석의 자력을 적절히 제어하는 용융도금공정에 있어서 강판의 반곡방지 제어장치를 제공함에 그 목적이 있다.The present invention has been invented to solve various problems caused by the conventional steel sheet bending prevention method in view of the above situation, the eddy current distance sensor and the electromagnet installed on both sides of the steel plate at a certain distance in the width direction of the steel plate It is an object of the present invention to provide an anti-bending control apparatus for steel sheets in a hot-dip plating process for appropriately controlling the magnetic force of each electromagnet so as to minimize the size of the semi-curves by using the distance values from the three points measured to the steel sheets.
상기한 목적을 달성하기 위한 본 발명 용융도금공정에 있어서 강판의 반곡방지 제어장치는 우측 에어나이프(3) 상부에 와전류식 거리센서(21a),(21b),(21c)를 일정한 간격으로 설치하고, 중앙의 와전류식 거리센서(21b)와 동일한 위치에다 전자석(22b)를 설치함과 더불어 좌측 에어나이프(3')의 상부에 전자석(22a),(22c)을 설치하며, 상기 와전류식 거리센서(21a),(21b),(21c)에다 반곡연산기(23)와 반곡제어기(24)를 차례로 거쳐 상기 전자석(22a),(22b),(22c)을 연결하여서 구성됨을 특징으로 한다.In the present invention to achieve the above object, the anti-bending control apparatus of the steel sheet in the hot-dip plating process is provided with eddy current type distance sensor (21a), (21b), (21c) at regular intervals on the upper right air knife (3) In addition, the electromagnet 22b is installed at the same position as the central eddy current distance sensor 21b, and the electromagnets 22a and 22c are installed on the upper side of the left air knife 3 '. The electromagnets 22a, 22b, and 22c are connected to (21a), (21b), and (21c) through the half-curve operator 23 and the half-curve controller 24, respectively.
그리고 상기 반곡연산기(23)는 하기 수학식 1에 의해 반곡의 크기(R)를 구하는 것이고, 상기 반곡제어기(24)는 반곡의 크기(R)가 작아지는 방향으로 전자석( 22a),(22b),(22c)의 자속크기를 제어하는 것이다.The half-curve operator 23 calculates the magnitude R of the half-curve according to Equation 1 below, and the half-curve controller 24 has electromagnets 22a and 22b in a direction in which the half-curve size R decreases. Is to control the magnetic flux size of (22c).
이하 첨부도면을 참조하여 본 발명의 작용을 상세하게 설명한다.Hereinafter, the operation of the present invention will be described in detail with reference to the accompanying drawings.
도 4는 본 발명 용융도금공정에 있어서 강판의 반곡방지 제어장치를 나타낸 구성도로서, 우측의 에어나이프(3) 쪽으로 오목한 강판의 반곡이 발생하는 설비의 경우에는 도 4와 같이 우측 에어나이프(3)의 상부에 와전류식 거리센서(21a),(21b) ,(21c)를 일정한 간격으로 설치하고, 중앙의 와전류식 거리센서(21b)와 동일한 위치에 전자석(22b)을 설치한다. 좌측 에어나이프(3')의 상부에는 두개의 전자석(22a),(22c)를 각각 와전류식 거리센서(21a),(21c)와 마주보도록 설치하여 와전류식 거리센서(21a),(21b),(21c)각각의 거리 측정값(Da∼Dc)이 반곡연산기(23)로 전송되어 반곡의 크기(R)가 정량적으로 계산된다. FIG. 4 is a block diagram showing the anti-bending control apparatus of the steel plate in the hot dip plating process of the present invention. In the case of the equipment in which the bending of the steel plate concave toward the air knife 3 on the right side occurs, the right air knife 3 as shown in FIG. The eddy current type distance sensors 21a, 21b, and 21c are installed at regular intervals on the top of the slit, and the electromagnet 22b is installed at the same position as the central eddy current distance sensor 21b. On the upper side of the left air knife 3 ', two electromagnets 22a and 22c are installed to face the eddy current distance sensors 21a and 21c, respectively, so that the eddy current distance sensors 21a and 21b, (21c) Each distance measurement value Da to Dc is transmitted to the half-curve calculator 23, and the magnitude R of the half-curve is quantitatively calculated.
도 5는 본 발명에 따른 와전류식 거리센서(21a),(21b),(21c)로부터 측정된 세 지점의 거리를 나타낸 도면으로서, 와전류식 거리센서(21a),(21b),(21c)로부터 측정된 세 지점의 거리를 각각 Da, Db, Dc라고 하면, 이 세개의 거리값으로 부터 반곡의 크기(R)는 하기 수학식 1로 부터 구해지게 된다. 5 is a view showing the distance of three points measured from the eddy current type distance sensor 21a, 21b, 21c according to the present invention, from the eddy current distance sensor 21a, 21b, 21c If the measured distances of three points are Da, Db, and Dc, respectively, the magnitude R of the semicircle is calculated from Equation 1 below.
상기 수학식 1에서 R은 반곡의 크기를 나타내며, Da = Db = Dc인 경우에는 반곡의 크기가 0이 된다.In Equation 1, R denotes the size of a half-curve, and when Da = Db = Dc, the size of the half-curve is zero.
반곡연산기(23)의 출력인 반곡의 크기(R)는 반곡제어기(24)로 인가되고, 반곡제어기(24)는 반곡의 크기(R)에 따라 전자석(22a∼22c)들의 자속(magnetic flux) 크기를 각각 계산하여 출력한다. 반곡제어기(24)에서 계산되는 전자석(22a),(22b), (22c)들 각각의 자속의 크기는 하기 수학식 2와 같다.The magnitude R of the halftone, which is the output of the halftone operator 23, is applied to the halftone controller 24, and the halftone controller 24 is the magnetic flux of the electromagnets 22a to 22c according to the magnitude R of the halftone. Calculate and print each size. The magnitude of the magnetic flux of each of the electromagnets 22a, 22b, and 22c calculated by the halftone controller 24 is expressed by Equation 2 below.
상기 수학식 2에서 △M은 현재 반곡의 크기(R)에 대한 자속의 변화량을 나타내고, KP는 반곡의 크기(R)에 비례하여 △M을 결정케하는 미분이득(derivative gain)이며, Ki는 반곡의 크기(R)의 시간에 따른 적분값에 비례하여 △M을 결정케 하는 적분이득(integral gain)이다. Ma(t), Mb(t), Mc(t)는 새로이 계산된 전자석( 22a),(22b),(22c) 각각의 자속 크기이며, Ma(t-1), Mb(t-1), Mc(t-1)은 바로 이전에 계산된 전자석(22a),(22b),(22c)에서 적절한 크기의 자속이 발생하게 되면 우측 전자석(22b)과 좌측 전자석(22a),(22c)에서 강판을 당기는 힘이 발생하게 되어 강판이 펴지게 되므로 강판의 반곡현상이 없어지게 된다.In Equation 2, ΔM represents a change amount of the magnetic flux with respect to the size R of the current halftone, and K P is a derivative gain for determining ΔM in proportion to the size R of the halftone, Ki. Is an integral gain that determines ΔM in proportion to the integral value of the half-length R in time. Ma (t), Mb (t), Mc (t) are the magnetic flux magnitudes of the newly calculated electromagnets 22a, 22b, and 22c, respectively, and Ma (t-1), Mb (t-1), Mc (t-1) is the steel plate in the right electromagnet 22b, the left electromagnets 22a, 22c when the appropriate magnetic flux occurs in the electromagnets 22a, 22b, and 22c calculated just before. The pulling force is generated so that the steel sheet is flattened so that the bending phenomenon of the steel sheet is eliminated.
상기한 바와 같이 작용하는 본 발명 용융도금공정에 있어서 강판의 반곡방지 제어장치에 의하면 강판의 반곡이 없어지고, 그에 따라 직선형 에어나이프를 사용하는 에어와이핑 방식의 도금량 조절에 있어서 강판의 폭방향으로 전후면 모두 균일하게 도금이 이루어지기 때문에 과도금 영역이 최소화 되어 도금재의 손실을 막을 수 있을 뿐만 아니라 도금 미달 부분이 사라지게 되어 제품불량이 감소하므로 제품의 실수율을 증가시키는 장점이 있다. According to the anti-bending control apparatus of the steel sheet in the hot-dip galvanizing process of the present invention acting as described above, the bending of the steel sheet is eliminated, and accordingly in the width direction of the steel sheet in the plating amount adjustment of the air wiping method using a straight air knife Since the plating is uniformly performed on both front and rear surfaces, the overplating area is minimized to prevent the loss of the plating material and the under-plating part disappears to reduce the product defects, thereby increasing the error rate of the product.
도 1은 제철소의 용융도금공정을 설명하기 위한 도면,1 is a view for explaining the hot-dip plating process of steel mills,
도 2는 강판의 반곡현상에 따라 도금되는 상태를 나타낸 도면,2 is a view showing a state plated according to the bending phenomenon of the steel sheet;
도 3은 강판의 반곡현상에 따라 도금된 도금상태도,3 is a plated state plated according to the bending phenomenon of the steel sheet,
도 4는 본 발명 용융도금공정에 있어서 강판의 반곡방지 제어장치를 나타낸 Figure 4 shows the anti-bending control device of the steel sheet in the hot dip plating process of the present invention
구성도, Diagram,
도 5는 본 발명에 따른 강판반곡 측정의 실시예를 설명하기 위한 도면이다.5 is a view for explaining an embodiment of the steel sheet bending measurement according to the present invention.
〈도면의 주요부분에 대한 부호의 설명〉<Explanation of symbols for main parts of drawing>
1 : 강판 2 : 도금욕조1 steel sheet 2 plating bath
3, 3' : 에어나이프 4 : 간격모터3, 3 ': Air knife 4: Spacing motor
5 : 안정화롤 6 : 상부롤5: stabilization roll 6: upper roll
7 : 컴프레서 8 : 도금량측정센서7: Compressor 8: Plating amount sensor
9 : 강판의 반곡현상 10 : 도금층9: bending of steel sheet 10: plating layer
11 : 목표도금량기준선 12 : 과도금영역11: target plating baseline 12: overplating area
13 : 도금미달부분 13: unplated portion
21a∼21c : 와전류식(eddy current)거리센서21a ~ 21c: eddy current distance sensor
22a∼22c : 전자석22a-22c: electromagnet
23 : 반곡연산기 24 : 반곡제어기23: half-corner 24: half-ball controller
Da∼Dc : 와전류식 거리센서(21a∼21c) 각각에서 강판까지의 거리값 Da to Dc: Distance value from each of the eddy current type distance sensors 21a to 21c to the steel sheet
Claims (3)
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| KR10-1999-0057114A KR100497082B1 (en) | 1999-12-13 | 1999-12-13 | Strip anti-bending control system in continous galvanizing line |
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