KR100301994B1 - Method for uniformly cooling hot rolled wire rod - Google Patents

Method for uniformly cooling hot rolled wire rod Download PDF

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Publication number
KR100301994B1
KR100301994B1 KR1019960071532A KR19960071532A KR100301994B1 KR 100301994 B1 KR100301994 B1 KR 100301994B1 KR 1019960071532 A KR1019960071532 A KR 1019960071532A KR 19960071532 A KR19960071532 A KR 19960071532A KR 100301994 B1 KR100301994 B1 KR 100301994B1
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South Korea
Prior art keywords
wire rod
cooling
mist
temperature distribution
temperature
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KR1019960071532A
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Korean (ko)
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KR19980052525A (en
Inventor
시성규
김상준
이필종
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이구택
포항종합제철 주식회사
신현준
재단법인 포항산업과학연구원
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B37/00Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/74Temperature control, e.g. by cooling or heating the rolls or the product
    • B21B37/76Cooling control on the run-out table
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B38/00Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
    • B21B38/006Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring temperature
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B45/00Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • B21B45/0203Cooling
    • B21B45/0209Cooling devices, e.g. using gaseous coolants
    • B21B45/0215Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
    • B21B45/0233Spray nozzles, Nozzle headers; Spray systems
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B2261/00Product parameters
    • B21B2261/20Temperature
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B43/00Cooling 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
    • B21B43/04Cooling beds comprising rolls or worms

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)

Abstract

PURPOSE: A method for uniformly cooling a hot rolled wire rod is provided which uniformly controls a widthwise temperature distribution of a ring shaped wire rod by spraying mist cooling water corresponding to the spray amount after measuring a widthwise temperature deviation and obtaining a spray amount according to the deviation. CONSTITUTION: In a method for cooling the wire rod(4) while the loaded wire rod is being transferred to a coiler(3) after loading a just hot rolled wire rod on a roller conveyor(5) in a cooling zone in a certain pitched ring shape, the method for uniformly cooling a hot rolled wire rod(4) comprises the steps of measuring a widthwise temperature distribution of the wire rod being transferred after loaded onto the roller conveyor(5) of the cooling zone in a ring shape; obtaining a temperature deviation(Δ T) for each portions on the basis of a temperature of the central part from the measured widthwise temperature distribution of the ring shaped wire rod; obtaining a flow rate of mist cooling water by the following equation using the obtained temperature deviation(ΔT) for each widthwise portions: £Equation| a flow rate(liter/hr)=(4.3-15.8)ΔT; and spraying mist cooling water by mist nozzles(13) a plurality of which are installed widthwise on the upper and lower surfaces of the ring shaped wire rod loaded corresponding to the obtained flow rate of mist cooling water.

Description

열간압연선재의 균일냉각방법Uniform Cooling Method of Hot Rolled Wire

본 발명은 열간압연된 직후의 선재를 일정 피치의 링형태로 냉각대의 롤러콘베이어상에서 적치하여 이송하는 도중 냉각장치에 의하여 선재를 냉각하는 방법에 관한 것으로, 보다 상세하게는 이송중인 열간압연선재를 폭방향으로 균일하게 냉각하는 방법에 관한 것이다.The present invention relates to a method of cooling a wire rod by a cooling device while transferring the wire rod immediately after hot rolling in the form of a ring of a predetermined pitch on a roller conveyor of a cooling stand. It is related with the method of cooling uniformly to a direction.

제 1 도는 종래 선재라인의 개략구성도이다. 압연기(1)에 의해 압연되어 수냉장치(2)에 의해 냉각된 열간압연선재(4)는 권취기(laying head)(3)에 의해 권취되어 콘베이어(5)위에 링모양으로 적치되어 이송된다. 이때, 콘베이어 하부에 설치된 송풍기(7)로 부터 슬릿형태의 노즐(6)을 통해 분사된 냉각공기가 선재를 하부로 부터 직접 냉각한다. 도면상의 부호 "▽"는 일점온도계가 설치된 지점이다. 상기 일점온도계는 콘베이어의 폭방향으로 일정 간격을 두고 다수개 설치되어 있다. 또한, 폭방향의 유속을 조정하기 위한 수단으로서 댐퍼라고 하는 송풍구 각도 조정장치가 송풍기 내에 설치되어 있고 이 댐퍼후단에 칸막이가 설치되어 있어 일단 분할된 유속이 다시 섞이지 않도록 되어 있다.1 is a schematic configuration diagram of a conventional wire rod. The hot rolled wire 4, which is rolled by the rolling mill 1 and cooled by the water cooling device 2, is wound by a winding head 3 and deposited in a ring shape on the conveyor 5 and transported. At this time, the cooling air injected through the slit-shaped nozzle 6 from the blower 7 installed in the lower portion of the conveyor directly cools the wire rod from the bottom. Reference numeral "o" in the drawing indicates a point where a one-point thermometer is installed. The one-point thermometer is provided in plurality at regular intervals in the width direction of the conveyor. Moreover, as a means for adjusting the flow velocity in the width direction, a blower angle adjusting device called a damper is provided in the blower, and a partition is provided at the rear end of the damper so that the flow rate once divided is not mixed again.

선재압연에서의 냉각공정은 압연기 이후에 최종제품으로 가기 위한 전단계로서, 물로 냉각하는 수냉대와 공기로 냉각하는 공냉대로 이루어져 있다. 수냉대에서 수분사에 의해 1차로 냉각된 선재는 레잉헤드(laying head)라고 하는 권취기에서 직선에서 링모양으로 감겨져서 공냉대 위를 이송한다. 이때 선재가 링모양으로 감겨져서 이송함에 따라 필연적으로 에지부에서 많이 겹쳐지는 부분과 중앙부에서 덜 겹쳐지는 부분이 존재하게 된다. 따라서 동일한 양으로 냉각을 시킬 경우에는 많이 겹쳐져 있는 부분과 그렇지 않은 부분사이에는 냉각차가 발생하게 되어 불균일하게 냉각이 이루어진다. 특히, 변태가 일어나는 지점에서의 냉각차는 제품불량의 중요한 원인이 된다. 불균일한 냉각이 되면, 변태가 일어나는 온도는 일정하므로 변태가 일어나는 지점이 달라지게 되어 제품품질이 불균일하게 된다. 따라서 가장 바람직한 경우는 균일하게 냉각이 되어, 선재링위치별로 동일한 냉각곡선을 그리면서 냉각되는 경우이다.The cooling process in the wire rolling is a preliminary step to the final product after the rolling mill, which is composed of a water cooler with water and an air cooler with air. The wire rod, first cooled by water sand in the water cooling zone, is wound in a straight line in a ring in a winding machine called a laying head, and then transported over the air cooling stand. At this time, as the wire is wound in a ring shape, a portion overlapping a lot at the edge portion and a portion overlapping less at the center portion exist. Therefore, when cooling in the same amount, a cooling difference is generated between a portion overlapping and a portion that is not so much that the cooling is uneven. In particular, the cooling car at the point where the transformation occurs is an important cause of product defects. If the non-uniform cooling, the temperature at which the transformation occurs is constant, so the point of transformation occurs is different, the product quality is uneven. Therefore, the most preferable case is a case where the cooling is uniformly cooled and drawing the same cooling curve for each wire ring position.

열간압연 선재의 대표적인 냉각방법으로는 전세계적으로 스텔모어(stelmor)방식이 가장 널리 사용되고 있다. 이 방법은 800-900℃의 열간압연선재를 권취기에서 링모양으로 형성한 후 콘베이어상에 낙하시켜, 비동심링 상태로 이송하면서 콘베이어 하부의 블로워로부터 20~50m/sec의 냉각공기를 불어 냉각하는 방법이다. 그러나 이 방법에 의해 얻어진 선재의 냉각속도는 낮아 원하는 강도를 가지는 선재를 제조하기 곤란하다. 이러한 스텔모어냉각법의 결점을 해결하기 위하여 물을 미소입자로 분무하거나 물을 냉각공기에 혼합하여 미스트냉각수로 분사하는 방법과 같은 미스트냉각법이 제안되고 있다.(일본특허공개 소 51-112721, 일본특허공개 소53-138917).Stallmor is the most widely used cooling method for hot rolled wire rods worldwide. This method forms a hot rolled wire of 800-900 ° C in the shape of a ring in the winder, and then drops it on the conveyor to cool it by blowing 20 ~ 50m / sec cooling air from the blower at the bottom of the conveyor while transferring it to the non-concentric ring state. That's how. However, the cooling rate of the wire rod obtained by this method is low, making it difficult to produce a wire rod having a desired strength. In order to solve the drawback of the Stelmore cooling method, a mist cooling method such as spraying water into fine particles or mixing water into cooling air and spraying into mist cooling water has been proposed. (Japanese Patent Laid-Open No. 51-112721, Japanese Patent) Pub. 53-138917).

그러나, 이러한 방법은 단순히 냉각매체의 냉각능력을 높이기 위한 것으로, 링모양 선재내에 발생하는 냉각속도의 편차의 해결법으로는 어떠한 제안도 나타나 있지 않는 실정이다.However, this method is merely to increase the cooling capacity of the cooling medium, and there is no suggestion as a solution for the variation of the cooling rate occurring in the ring-shaped wire rod.

또한, 균일냉각을 위하여 종래의 냉각대에서는 모터로 폭방향으로의 전체적인 풍량을 조절하며, 송풍구 각도를 변경 냉각대에서 폭방향 풍속분포를 조절하는 방법이 제안되어 왔다. 그러나, 폭방향의 온도분포를 제어할 수 있는 수단이 없거나, 있으되 전 소재에 대해 고정되어 있어 가변시킬 수 없는 경우와 같이 거의 제어가 불가능한 상태이다. 또한, 온도분포제어의 수단으로서 송풍구 입측의 댐퍼와 출측의 디플렉터를 송풍기내에 설치는 경우 제어가 가능하나 댐퍼의 디플렉터만으로는 폭방향의 온도분포를 균일하게 하는데에 한계가 있다.In addition, in the conventional cooling zone for uniform cooling, a method of controlling the overall air volume in the width direction by a motor and changing the angle of the tuyeres has been proposed to control the widthwise wind speed distribution in the cooling zone. However, there is no means for controlling the temperature distribution in the width direction, but it is almost impossible to control, such as when it is fixed to all materials and cannot be changed. In addition, when the damper at the inlet side and the deflector at the outlet side are installed in the blower as a means of temperature distribution control, control is possible, but only the deflector of the damper has a limitation in making the temperature distribution in the width direction uniform.

최근에는, 폭방향의 온도분포를 균일하게 하기 위하여 선재이송시 상하면에서 전체적으로 미스트냉각수를 분사하면서 폭방향의 노즐배치를 달리하여 엣지부에 더 많은 숫자의 노즐을 배치하는 방법과, 겹침밀도가 높은 엣지부에만 미스트냉각수를 분사하는 방법이 제안되고 있다.(일본특허공개 평 6-10054, 미국특허 5,526,652).Recently, in order to make the temperature distribution in the width direction uniform, in the case of wire transfer, mist cooling water is sprayed from the upper and lower sides as a whole, and the nozzle arrangement in the width direction is changed so that a larger number of nozzles are placed at the edge portion, and the overlap density is high. A method of spraying mist cooling water only on the edge part has been proposed (Japanese Patent Laid-Open No. 6-10054, US Patent 5,526,652).

제 2 도는 선재의 중첩상태에 따른 코일내 폭방향 중량비를 나타낸 것으로, 중심부를 1.0으로 할 때 양단부에서는 3.0-3.5으로 매우 커짐을 알 수 있다. 따라서 양단부에서는 필요 냉각량 또한 이에 비례하여 커져야만 한다는 것을 추정할 수 있다. 이때 냉각공기량이 폭방향으로 동일하다면 양단부의 냉각속도는 중심부에 비하여 떨어질 수 밖에 없으므로, 통상 이의 제어를 위해 냉각공기 토출부, 즉 노즐부의 면적 혹은 노즐의 수량을 폭방향으로 불균일하게 설정하거나 송풍구 각도(댐퍼 각도)와 송풍구 회전수를 조절하기도 한다. 그러나, 송풍구 각도 변경에 의하여 폭방향 송풍량을 조정하여 폭방향 온도편차를 줄이는 방법은 고속으로 공기가 유입되는 덕트내에서 바람의 면적으로 넓은 판으로 조절하기 때문에, 각도를 미세 조정하더라도 공기속도에 의한 진동으로 동일한 유속분포가 얻어지는 경향이 있어, 제어시 분해능이 떨어진다. 따라서, 현재 사용되고 있는 제어수단으로는 엣지부와 중앙부의 온도편차를 줄이는데는 한계가 있고, 특히, 동일한 엣지부라 하더라도 겹침밀도의 불균일에 의하여 공기만으로 냉각하면 냉각속도 역시 떨어지게 되어 냉각편차가 발생하게 된다. 이와같은 문제점을 해결하기 위하여 상기한 미스트냉각수를 분사하는 방법이 제안되고 있으나, 이러한 개선안들은 모두 단순히 미스트에 의해 선재의 상면 또는 하면에서 미스트를 분사시키는 것으로 냉각속도를 증가시킴으로써 문제가 되고 있는 냉각편차에 대한 감소제안은 없는 실정이다. 또한, 폭방향의 겹침밀도나 순간적으로 변화하는 조업인자에 따른 즉각적인 제어에 관한 제안은 나타나지 않고 있다.Figure 2 shows the weight ratio in the coil width according to the overlapping state of the wire rod, it can be seen that when the center is 1.0, both ends are very large (3.0-3.5). Therefore, it can be estimated that the amount of cooling required at both ends should also be proportionately increased. At this time, if the amount of cooling air is the same in the width direction, the cooling speed of both ends is inevitably lowered compared to the center part. Therefore, in order to control this, the area of the cooling air discharge part, that is, the nozzle part or the number of nozzles is set unevenly in the width direction, or the blower angle (Damper angle) and blower speed can also be adjusted. However, the method of reducing the widthwise temperature deviation by adjusting the widthwise airflow amount by changing the angle of the blower is controlled by a wide plate with a large area of wind in the air inflowing air at high speed. The same flow velocity distribution tends to be obtained by vibration, resulting in poor resolution during control. Therefore, currently used control means has a limit in reducing the temperature deviation of the edge portion and the center portion, in particular, even in the same edge portion when cooling only by air due to the nonuniformity of the overlap density, the cooling rate is also lowered, causing a cooling deviation. . In order to solve the above problems, a method of spraying the above-mentioned mist cooling water has been proposed, but all of these improvements are simply cooling mist which is a problem by increasing the cooling rate by spraying mist on the upper or lower surface of the wire rod by mist. There is no suggestion for the reduction. In addition, there is no suggestion regarding immediate control according to overlapping density in the width direction or an operation factor that changes momentarily.

이에 본 발명자들은 상기 문제점을 해결하기 위해 연구와 실험을 거듭하고, 그 결과에 근거하여 본 발명을 제안하게 된 것으로, 본 발명은 열간압연된 선재를 일정피치의 링형태로 적치시켜 이송하면서 냉각시킴에 있어서, 폭방향의 온도편차를 측정하고, 그 편차에 따라 분사량을 구하고, 이 분사량에 상응하게 미스트 냉각수를 분사함으로써, 선재링의 폭방향 온도분포를 균일하게 제어할 수 있는 열간압연선재의 균일냉각방법을 제공하고자 하는데, 그 목적이 있다.In order to solve the above problems, the present inventors have repeatedly studied and experimented, and proposed the present invention based on the results. The present invention cools down the hot rolled wire rod by transferring it to a certain pitch ring shape. By measuring the temperature deviation in the width direction, calculating the injection amount according to the deviation, and spraying the mist cooling water corresponding to the injection amount, the uniformity of the hot rolled wire rod that can control the width direction temperature distribution of the wire rod uniformly It is to provide a cooling method, which has a purpose.

제 1 도는 종래 선재냉각대의 개략구성도1 is a schematic configuration diagram of a conventional wire rod cooling stand

제 2 도는 선재 냉각대 폭방향 적치밀도를 나타낸 상태도2 is a state diagram showing the load density of the wire rod cooling zone in the width direction

제 3 도는 선재 폭방향 온도분포를 나타낸 그래프3 is a graph showing the wire width direction temperature distribution

제 4 도는 본 발명이 바람직하게 적용될수 있는 선재 균일냉각장치의 일례를 나타낸 개략구성도4 is a schematic configuration diagram showing an example of a wire rod uniform cooling apparatus to which the present invention can be preferably applied.

제 5 도는 본 발명에 따라 폭방향으로 배열되는 미스트 노즐의 개략구성도5 is a schematic configuration diagram of a mist nozzle arranged in the width direction according to the present invention.

제 6 도는 종래방법에 따라 냉각한 후의 선재 냉각곡선과 본 발명을 사용한 후의 선재 냉각곡선을 나타내는 그래프.6 is a graph showing the wire rod cooling curve after cooling according to the conventional method and the wire rod cooling curve after using the present invention.

* 도면의 주요 부분에 대한 부호의 설명* Explanation of symbols for the main parts of the drawings

1 : 압연기 2 : 수냉장치1: rolling mill 2: water cooling device

3 : 권취기 4 : 선재3: winding machine 4: wire rod

5 : 콘베이어 6 : 노즐5: conveyor 6: nozzle

7 : 송풍기 8 : 온도분포측정장치7: blower 8: temperature distribution measuring device

9 : 리모트아이오 10 : 콘트롤러9: Remote Io 10: Controller

12 : 모니터 13 : 미스트노즐12: monitor 13: mist nozzle

14 : 송수관 15 : 제어변14: water pipe 15: control valve

본 발명은 열간압연된 직후의 선재를 일정피치의 링형태로 냉각대에 롤러콘베이어상에 적치하여 권치기로 이송하는 도중에 수냉시키는 방법에 있어서,In the method of the present invention, the wire rod immediately after hot rolling is placed on a roller conveyor on a cooling stand in the form of a ring of a constant pitch and water-cooled during transfer to a winding machine.

상기 냉각대의 롤러 콘베이어상에 링형태로 적치되여 이송중인 선재링의 폭방향 온도분포를 측정하는 단계;Measuring a temperature distribution in the width direction of the wire rod being transferred in a ring form on the roller conveyor of the cooling stage;

상기와 같이 측정된 선재링의 폭방향 온도분포로부터 중심부의 온도를 기준으로 하여 각부위에 대한 온도편차(ΔT)룰 구하는 단계;Obtaining a temperature deviation (ΔT) rule for each part based on the temperature of the center part from the width direction temperature distribution of the wire rod measured as described above;

상기와 같이 구한 폭방향의 각부위에 대한 온도편차(ΔT)를 이용하여 하기식에 의해 미스트 냉각수 유량을 구하는 단계 및Obtaining the mist cooling water flow rate by the following equation using the temperature deviation (ΔT) for each part in the width direction obtained as described above; and

유량(1/hr) = (4.3~15.8)ΔTFlow rate (1 / hr) = (4.3 ~ 15.8) ΔT

상기와 같이 구한 미스트 냉각수 유량에 상응하게 상기 적치된 선재링의 상하면에 폭방향으로 다수개 설치된 미스트 노즐에 의해 미스트 냉각수를 분사하는 단계를 포함하여 구성되는 열간압연선재의 균일냉각방법에 관한 것이다.The present invention relates to a method for uniformly cooling hot rolled wire, comprising spraying mist coolant by a plurality of mist nozzles disposed in the width direction on upper and lower surfaces of the wire rods stacked corresponding to the flow rate of the mist coolant obtained as described above.

이하, 본 발명을 보다 상세히 설명한다.Hereinafter, the present invention will be described in more detail.

본 발명은 열간압연된 직후의 선재를 일정 피치의 링형태로 냉각대 롤러콘베이어상에 적치하여 권취기로 이송하면서 선재링의 폭방향으로 균일하게 냉각시키는 방법에 관한 것이다. 상기와 같이 적치되어 이송중인 선재는 폭방향 적치밀도차에 의해 온도차이가 난다. 제 3 도에는 이와같은 선재 냉각대 폭방향 온도분포의 일례가 나타나 있다. 제 3 도에 나타난 바와같이, 폭방향으로 보면 중첩밀도가 높은 양단부의 온도가 중첩밀도가 낮은 중앙부의 온도보다 높은 것을 알 수 있다.The present invention relates to a method of uniformly cooling the wire rod in the width direction of the wire rod while the wire rod immediately after hot rolling is placed on a cooling roller roller conveyor in the form of a ring of a constant pitch and transported to a winder. The wire rod being stacked and transported as described above has a temperature difference due to the widthwise pile density difference. 3, an example of such a wire rod cooling zone width direction temperature distribution is shown. As shown in Fig. 3, in the width direction, it can be seen that the temperature at both ends having a high overlap density is higher than the temperature at the central part having a low overlap density.

본 발명은 상기와 같은 폭방향 온도분포차이를 보다 효율적으로 제어하기 위한 것으로, 본 발명에 따라 연간압연선재를 균일하게 냉각하기 위해서는 제 4 도에 나타난 바와같이, 상기 적치되어 이송되는 선재(4)의 폭방향으로 다수개 설치해야 한다.The present invention is to more efficiently control the width difference in the temperature direction as described above, in order to uniformly cool the annually rolled wire according to the present invention, as shown in Figure 4, the wire rods are placed and transported Multiple pieces should be installed in the width direction of.

본 발명에 부합되는 온도분포측정장치(8)로는, 예를들어 좌우 연속적으로 물체의 표면을 주사하고 그 선상을 따라 온도를 측정하는 라인스캐닝 적외선(line scanning IR) 온도측정기 등을 들 수 있다. 이러한 온도분포측정장치(8)는 권취기(3)로 부터 10-20m 정도 떨어진 위치에 설치하는 것이 바람직하다. 또한, 상기 노즐은 폭방향으로 일정간격을 두고 10개 정도를 배치하는 것이 바람직하다.As the temperature distribution measuring apparatus 8 according to the present invention, for example, a line scanning IR temperature measuring instrument which scans the surface of an object continuously and right and left and measures the temperature along its line is mentioned. The temperature distribution measuring device 8 is preferably installed at a position 10-20 m away from the winding machine 3. In addition, the nozzles are preferably arranged about 10 at regular intervals in the width direction.

다음에, 상기 온도분포측정장치(8)를 이용하여 냉각대의 롤러콘베이어(5) 상에 적치되어 링형태로 이송중인 선재링의 폭방향 온도분포를 측정한다.Next, the temperature distribution measuring device 8 measures the width distribution in the width direction of the wire ring which is placed on the roller conveyor 5 of the cooling stand and conveyed in the form of a ring using the temperature distribution measuring device 8.

다음에, 상기와 같이 측정된 선재링의 폭방향온도분포로부터 중심부의 온도를 기준으로 하여 각부위에 대한 온도편차(ΔT)룰 구한다.Next, the temperature deviation ΔT for each part is determined based on the temperature of the center part from the widthwise temperature distribution of the wire rod measured as described above.

다음에, 상기와 같이 구한 폭방향의 각부위에 대한 온도편차(ΔT)를 이용하여 하기식에 의해 미스트 냉각수 유량을 구한다.Next, the mist cooling water flow rate is calculated | required by the following formula using temperature deviation (DELTA) T with respect to each part of the width direction calculated | required as mentioned above.

유량(1/hr) = (4.3~15.8)ΔTFlow rate (1 / hr) = (4.3 ~ 15.8) ΔT

본 발명에 있어서, 온도편차 1℃를 감소시킬 수 있는 미스트 냉각수의 유량은 4.3∼15.8 l/hr이기 때문에 상기와 같은 식을 얻을 수 있는 것이다.In the present invention, since the flow rate of the mist cooling water capable of reducing the temperature deviation 1 ° C is 4.3 to 15.8 l / hr, the above equation can be obtained.

상기와 같이 구한, 미스트 냉각수 유량에 상응하게 상기 미스트 노즐에 의해 미스트 냉각수를 분사함으로써, 열간압연선재의 폭방향으로의 온도분포가 균일하게 된다.By spraying the mist cooling water with the mist nozzle corresponding to the mist cooling water flow rate obtained as described above, the temperature distribution in the width direction of the hot rolled wire is made uniform.

이하, 본 발명의 자동제어에 대하여 설명한다.Hereinafter, the automatic control of the present invention will be described.

현재 스텔모어냉각법을 적용하여 가동중인 선재공장들에서는 냉각대상을 이송하는 선재의 폭방향 온도분포를 제어하기 위한 설비인 댐퍼가 송풍기내에 설치되어 있으나 공기만으로 냉각하는데는 냉각능력에 한계가 있다. 또한 냉각대 중간의 온도분포를 알 수 있는 계측장치의 미비로 인해 냉각대상에서 불균일한 온도분포를 제어할 방법이 없다. 불균일한 온도분포가 발생하여도 제어가 이루어지지 않기 때문에 같은 소재를 연속해서 수십코일씩 작업하는 도중에 계속적인 온도편차가 발생한다. 이로인한 재질편차가 후공정에서 발생되기도 한다. 본 발명에서는 작업중에 폭방향으로 다수개를 선재의 상부와 하부에 각각 설치하고, 냉각대 상에 설치한 온도분포 측정장치로부터 측정된 온도분포 값을 리모트아이오(원격 입출력기)(9)를 통해 분사유량 제어용 콘트롤러(10)으로 송신되는 방식을 취할 수 있다. 즉, 폭방향으로 배열된 미스트 노즐에 상응하는 위치의 온도값으로부터 각각의 노즐로 제어정보를 주게되어 분사량을 자동제어하게 되는 것이다. 폭방향으로 불균일한 온도분포가 검출됨과 동시에 미스트 노즐의 분사량이 자동제어됨으로써 균일한 온도분포가 유지 될 수 있다. 이때 미스트노즐이 폭방향으로 배열된 냉각장치들은 선재 이송 방향에 대해 여러곳으로 배치할 수 있다. 또한, 본 발명의 방법에서는 변화하는 온도분포는 모니터에서 육안으로 확인할 수도 있다. 이와같이, 본 발명 방법은 종래에 사용되는 냉각방법의 단점인 수시로 변화하는 운전조건에 따른 온도분포의 변화에 대응할 수 없다는 점을 개선한 것이다.Currently, wire rod factories that are operating by applying the Stelmore cooling method are equipped with a damper in the blower, which is a facility for controlling the widthwise temperature distribution of the wire that carries the cooling target, but the cooling capacity is limited in cooling only with air. In addition, there is no way to control the non-uniform temperature distribution in the cooling target due to the lack of a measuring device that can know the temperature distribution in the middle of the cooling zone. Even if an uneven temperature distribution occurs, the control is not performed. Therefore, a continuous temperature deviation occurs during the operation of several tens of coils of the same material continuously. This can lead to material deviations in later processes. In the present invention, during operation, a plurality of wire rods are installed in the upper and lower portions of the wire rod, respectively, and the temperature distribution values measured from the temperature distribution measuring device installed on the cooling stand are provided through the remote I / O 9. It may take a manner to be transmitted to the injection flow rate control controller 10. That is, control information is given to each nozzle from a temperature value at a position corresponding to the mist nozzles arranged in the width direction, thereby automatically controlling the injection amount. A nonuniform temperature distribution in the width direction is detected and a uniform temperature distribution can be maintained by automatically controlling the injection amount of the mist nozzle. At this time, the cooling device in which the mist nozzles are arranged in the width direction may be arranged in several places with respect to the wire transfer direction. In the method of the present invention, the changing temperature distribution can also be visually confirmed on a monitor. As described above, the method of the present invention improves the fact that it is not possible to cope with the change of the temperature distribution according to the frequently changing operating conditions, which is a disadvantage of the conventional cooling method.

이하, 실시예를 통하여 본 발명을 보다 상세히 설명한다.Hereinafter, the present invention will be described in more detail with reference to Examples.

[실시예]EXAMPLE

하기 표 1과 같은 제원을 갖는 Howllow Cone Type의 노즐을 사용하여 본 발명의 조건으로 고온선재의 냉각을 여러번 실시하였다.By using the nozzle of Howllow Cone Type having the specifications as shown in Table 1, the cooling of the high temperature wire was carried out several times under the conditions of the present invention.

[표 1]TABLE 1

상기와 같은 실험으로 얻어진 선재폭방향의 온도분포를 개략적으로 분석하였으며, 본 발명의 방법에 따른 온도제어 실시전과 실수후로 구분한 후, 제 6 도에 나타내었다.The temperature distribution in the width direction of the wire rod obtained by the experiment as described above was roughly analyzed and shown in FIG. 6 after dividing it into before and after performing temperature control according to the method of the present invention.

제 6 도에 나타난 바와같이 본 발명에 따라 온도분포를 제어한 경우에는 어느정도 균일한 온도분포를 갖는다는 것을 알 수 있었다.As shown in FIG. 6, when the temperature distribution was controlled according to the present invention, it was found that the temperature distribution was somewhat uniform.

상술한 바와같은 본 발명은 선재냉각대에서의 균일냉각을 위하여 냉각대 중간에 설치된 온도분포 측정장치를 통하여 폭방향의 온도분포를 산출하여 조업인자변화에 따라 미스트냉각노즐의 분사량을 동적제어한다. 따라서, 균일한 온도분포를 얻을 수 있어, 냉각대상의 불균일 냉각에 의해 발생하는 폭방향의 재질편차를 줄일 수 있으며, 또한 미스트냉각에 의해 급냉이 가능하면서 코일내 및 코일간의 조업인자의 변화에 의한 변동요인을 감지하여 온도분포를 균일하게 제어할 수 있다는 장점이 있다.As described above, the present invention calculates the temperature distribution in the width direction through a temperature distribution measuring device installed in the middle of the cooling stand for uniform cooling in the wire cooling stand, and dynamically controls the injection amount of the mist cooling nozzle according to the change of the operation factor. Therefore, it is possible to obtain a uniform temperature distribution, to reduce the material deviation in the width direction caused by non-uniform cooling of the cooling target, and to allow rapid cooling by mist cooling, and to change the operating factors in and between coils. There is an advantage that the temperature distribution can be controlled uniformly by detecting fluctuating factors.

Claims (1)

열간압연된 직후의 선재를 일정 피치의 링형태로 냉각대에 롤러콘베이어상에 적치하여 권치기로 이송하는 도중에 수냉시키는 방법에 있어서,In a method in which the wire rod immediately after hot rolling is placed on a roller conveyor on a cooling stand in the form of a ring of a constant pitch and water-cooled during transfer to a winding machine. 상기 냉각대의 롤러 콘베이어상에 링형태로 적치되어 이송중인 선재링의 폭방향 온도분포를 측정하는 단계;Measuring the temperature distribution in the width direction of the wire rod being transferred in a ring form on the roller conveyor of the cooling stage; 상기와 같이 측정된 선재링의 폭방향 온도분포로부터 중심부의 온도를 기준으로 하여 각부위에 대한 온도편차(ΔT)를 구하는 단계;Obtaining a temperature deviation (ΔT) for each part based on the temperature of the center part from the width direction temperature distribution of the wire rod measured as described above; 상기와 같이 구한 폭방향의 각부위에 대한 온도편차(ΔT)를 이용하여 하기식에 의해 미스트 냉각수 유량을 구하는 단계 및Obtaining the mist cooling water flow rate by the following equation using the temperature deviation (ΔT) for each part in the width direction obtained as described above; and 유량(1/hr) = (4.3~15.8)ΔTFlow rate (1 / hr) = (4.3 ~ 15.8) ΔT 상기와 같이 구한 미스트 냉각수 유량에 상응하게 상기 적치된 선재링의 상하면에 폭방향으로 다수개 설치된 미스트 노즐에 의해 미스트 냉각수를 분사하는 단계를 포함하여 구성되는 것을 특징으로 하는 열간압연선재의 균일냉각방법.And spraying the mist coolant by the mist nozzles provided in a plurality of width directions on the upper and lower surfaces of the stacked wire rings corresponding to the flow rate of the mist cooling water obtained as described above. .
KR1019960071532A 1996-12-24 1996-12-24 Method for uniformly cooling hot rolled wire rod KR100301994B1 (en)

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Publication number Priority date Publication date Assignee Title
KR20020020107A (en) * 2000-09-08 2002-03-14 이구택 Injection Volume Measuring apparatus of Cooling Water for Rolling Steel plate
KR20020051081A (en) * 2000-12-22 2002-06-28 이구택 System for cooling hot rolled wire and method thereof
KR20030053097A (en) * 2001-12-22 2003-06-28 주식회사 포스코 Device for cooling of hot rolled wire rode
KR20040046126A (en) * 2002-11-26 2004-06-05 주식회사 포스코 A uniform laminar flow system to width direction of strip
KR101253827B1 (en) * 2010-09-10 2013-04-12 주식회사 포스코 Method and Apparatus for Cooling Wire-rod Coil

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