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WO2014178522A1 - Slab crack diagnosing method - Google Patents

Slab crack diagnosing method Download PDF

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Publication number
WO2014178522A1
WO2014178522A1 PCT/KR2014/000776 KR2014000776W WO2014178522A1 WO 2014178522 A1 WO2014178522 A1 WO 2014178522A1 KR 2014000776 W KR2014000776 W KR 2014000776W WO 2014178522 A1 WO2014178522 A1 WO 2014178522A1
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WIPO (PCT)
Prior art keywords
edge
slab
short side
crack
temperature
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Ceased
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PCT/KR2014/000776
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French (fr)
Korean (ko)
Inventor
권효중
조원재
하태준
이계영
최주태
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Hyundai Steel Co
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Hyundai Steel Co
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Publication date
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Publication of WO2014178522A1 publication Critical patent/WO2014178522A1/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N25/00—Investigating or analyzing materials by the use of thermal means
    • G01N25/72—Investigating presence of flaws
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/20—Metals
    • G01N33/204—Structure thereof, e.g. crystal structure
    • G01N33/2045—Defects

Definitions

  • the present invention relates to a slab crack diagnosis method.
  • the molten steel refined in the steelmaking process is transferred to a ladle in the steelmaking process, transferred from the ladle to a tundish, which is an intermediate storage device, and then supplied to one or more molds.
  • the molten steel is cooled while passing through the continuous casting facility and solidified into a solid slab.
  • molten steel first forms a solidification shell while passing through a water cooling mold, and then passes through a strand to completely solidify the remaining solid through slab spray to form a solid slab.
  • the slab is continuously produced by supplying molten steel to the mold.
  • Embodiments of the present invention provide a slab crack diagnosis method for determining whether a longitudinal crack of a slab is generated using a plurality of temperature sensors and a crack index.
  • a center temperature sensor installed in the center of the short side of the mold, measuring the temperature of the center of the slab short side; Measuring the temperature of the edge of the slab short side using an edge temperature sensor provided at the edge of the mold short side; Calculating a crack index by using a temperature deviation between the center of the slab short side and the edge of the slab short side; And comparing the calculated crack index with a reference value to determine whether a longitudinal crack occurs in the short side portion of the slab.
  • the center temperature sensor and the edge temperature sensor are each composed of a plurality, the plurality of center temperature sensor, the center of the mold short side portion is disposed spaced apart in the longitudinal direction of the mold short side portion, the plurality of edge temperature sensors, The mold short sides may be spaced apart from the plurality of center temperature sensor intervals in the longitudinal direction of the mold short sides.
  • the calculating of the crack index may include calculating the crack index for each row formed by the center temperature sensor and the edge temperature sensor in the width direction of the mold short side portion, and the crack index may be arranged in the same row.
  • the temperature measured by the center temperature sensor and the edge temperature sensor may be a deviation.
  • the determining of the longitudinal crack of the slab short side may include determining that the longitudinal crack of the slab short side is generated when the maximum value of the crack index calculated for each row is larger than a reference value.
  • the edge temperature sensors are respectively installed at both edges of the mold short side portion, and in the step of calculating the crack index, the crack index is a minimum value of the temperature measured by the edge temperature sensors respectively installed at both edges of the mold short side portion. It may be a deviation of the temperature measured by the center temperature sensor.
  • the calculating of the crack index may include: calculating a center average temperature of the slab short side by using temperatures measured by the plurality of center temperature sensors; Calculating an edge average temperature of the slab short side portion using temperatures measured by a plurality of edge temperature sensors; And calculating a deviation between the center average temperature and the edge average temperature.
  • the edge temperature sensor is installed at both edges of the mold short side portion, and in the step of calculating the crack index, the crack index is the minimum value of the edge average temperatures for each edge of the slab short side portion and the center. It may be a deviation of the average temperature.
  • the edge temperature sensor may be installed at a position spaced 50 mm or less from the edge of the mold short side portion.
  • the cost for diagnosing the crack of the slab can be reduced, and it is possible to accurately diagnose the crack occurring at the edge of the slab.
  • 1 is a view showing the center temperature sensor and the edge temperature sensor of the mold used in the slab crack diagnosis method according to an embodiment of the present invention.
  • Figure 2 is a flow chart showing a slab crack diagnosis method according to an embodiment of the present invention.
  • FIG. 3 is a diagram illustrating diagnosing slab cracks with a slab crack diagnosis method according to an embodiment of the present invention.
  • Figure 4 is a flow chart showing a slab crack diagnosis method according to another embodiment of the present invention.
  • FIG. 5 is a diagram illustrating diagnosing slab cracks with a slab crack diagnosis method according to another embodiment of the present invention.
  • first and second may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.
  • the temperature sensor of the mold 10 used in the slab 20 crack diagnosis method according to the present invention includes a center temperature sensor 110 and an edge temperature sensor 120, the edge temperature sensor ( 120 may include a first edge sensor 121 and a second edge sensor 122.
  • the temperature sensor of the mold 10 may not be installed above the mold 10. Since the immersion nozzle connected to the tundish is immersed in the upper portion of the mold 10 and the upper portion of the mold 10 is not in contact with molten steel, a temperature sensor is not installed on the upper portion of the mold 10 for cost reduction.
  • the center temperature sensor 110 is a temperature sensor installed at the center of the short side of the mold 10 to measure the center temperature of the surface of the short side of the slab 20.
  • the center temperature sensor 110 may include a thermocouple, and measure the surface temperature of the center of the short side of the slab 20 at unit time intervals. For example, the center temperature sensor 110 may measure the surface temperature at the center of the short side of the slab 20 at intervals of 1 second.
  • the term 'center' is used as a concept including a position separated by 50 mm or less in the width direction from the center of the mold 10 short side as well as the center of the mold 10 short side. That is, the center temperature sensor 110 may be installed at the center of the short side of the slab 20 or may be installed at a position 50 mm or less in the width direction from the center of the short side of the mold 10.
  • Center temperature sensor 110 may be a plurality.
  • the plurality of center temperature sensors 110 may be spaced apart from each other in the longitudinal direction of the short side of the mold 10. In addition, the plurality of center temperature sensors 110 may be spaced apart at equal intervals.
  • the edge temperature sensor 120 is a temperature sensor installed at the edge of the mold 10 short side in order to measure the edge temperature of the surface of the short side of the slab 20, and may be a thermocouple similar to the center temperature sensor 110.
  • the edge temperature sensor 120 may be installed at a position spaced 50 mm or less from the edge of the mold 10. When the edge temperature sensor 120 is spaced apart from the corner of the mold 10 by more than 50 mm, the edge temperature of the slab 20 may not be accurately measured.
  • the edge temperature sensor 120 may also measure the surface temperature of the edge of the short side of the slab 20 in unit time intervals, for example, 1 second.
  • the edge temperature sensor 120 may be formed in plural, and the plurality of edge temperature sensors 120 may be disposed on the edge of the mold 10 to be spaced apart from each other in the longitudinal direction. In this case, the plurality of edge temperature sensors 120 may be spaced apart at equal intervals.
  • the edge temperature sensor 120 may be installed at both edges based on the center temperature sensor 110, in which case, one is called the first edge sensor 121 and the other is the second edge sensor 122. It can be said.
  • the first edge sensor 121 and the second edge sensor 122 may be installed at positions spaced apart from each other by 50 mm or less from an edge of the mold 10.
  • the first edge sensor 121 may be installed at a position 50mm away from the left edge of the mold 10
  • the second edge sensor 122 may be installed at a position 50mm away from the right edge of the mold 10. have.
  • the slab 20 crack diagnosis method by measuring the temperature using the center temperature sensor 110 (S110), using the edge temperature sensor 120
  • the method may include measuring temperature (S120), calculating a crack index for each row (S130), and determining whether cracks have occurred (S140 and S150).
  • Measuring the temperature using the center temperature sensor 110 is a step of measuring the central temperature of the slab 20 using the center temperature sensor 110.
  • Measuring the temperature using the edge temperature sensor 120 is a step of measuring the edge temperature of the slab 20 using the edge temperature sensor 120.
  • the edge temperature sensor 120 is installed at both edges of the mold 10, the edge temperature of the slab 20 may be measured, respectively.
  • the step of calculating the crack index (S130) is a step of calculating an index relating to the possibility of longitudinal cracking of the slab 20, and is calculated by using a temperature deviation between the center of the slab 20 and the edge of the slab 20. .
  • the crack index may be obtained as a deviation of temperatures measured by the center temperature sensor 110 and the edge temperature sensor 120, respectively. For example, if the temperature measured by the center temperature sensor 110 is 100 ° C and the temperature measured by the edge temperature sensor 120 is 90 ° C, the crack index may be 10.
  • the crack index is measured by the first edge sensor 121 and the second edge sensor 122, respectively. It may be a temperature deviation between the minimum value of the temperatures (T 1, T 2 ) and the temperature (Tc) measured by the center temperature sensor 110.
  • the crack index may be 20, which is a temperature deviation of 100 ° C. and 80 ° C.
  • the crack index is the center temperature sensor 110 and the edge.
  • the temperature sensor 120 may be calculated for each row formed in the width direction of the short side of the mold 10. That is, referring to FIG. 1, the crack index C n is represented by 1 row, 2 rows,... , C 1 , C 2 ,. , May be calculated as C N.
  • the crack index may be determined to be equal to or greater than a reference value in operation S140 to determine whether a crack in the longitudinal direction of the slab 20 occurs in operation S150.
  • the reference value may be 20.
  • the graph of FIG. 3 shows a case where the reference value is set to 20.
  • the crack index is 20 or more, and it is interpreted that a longitudinal crack occurred in the slab 20.
  • the crack index is determined to be greater than or equal to the reference value, and thus it is determined that the longitudinal crack has occurred in the slab 20, and the crack may be removed by scarfing the slab 20.
  • the maximum value of the crack index calculated for each row may be compared with a reference value.
  • the temperature is measured using the center temperature sensor 110 (S210) and the edge temperature sensor 120 is used. It may include the step of measuring the temperature (S220), the step of calculating the crack index (S230) and determining whether the crack occurs (S240, S250).
  • Measuring the temperature using the edge temperature sensor 120 is a step of measuring the edge temperature of the slab 20 using the plurality of edge temperature sensors 120.
  • the calculating of the crack index (S230) may include calculating a center average temperature and an edge average temperature (S231) and calculating a temperature deviation (S232).
  • the center average temperature of the short sides of the slab 20 is calculated using the temperatures measured by the plurality of center temperature sensors 110, and the plurality of edge temperature sensors ( Computing the edge average temperature of the short side portion of the slab 20 by using the temperature measured in (120).
  • a center average temperature is an average of temperatures measured by a plurality of center temperature sensors 110, that is, a group A
  • an edge average temperature is an average of temperatures respectively measured by a plurality of edge temperature sensors 120.
  • the edge temperature sensor 120 may include a B group consisting of a plurality of first edge sensors 121 and a C group consisting of a plurality of second edge sensors 122. Edge average temperature can be calculated in Group B and Group C, respectively.
  • Computing the temperature deviation (S232) is a step of calculating the deviation between the center average temperature and the edge average temperature.
  • the temperature deviation calculated in the step is B group It may be calculated as a deviation between the smaller of the edge average temperature ( avg T 1 ) and the average edge temperature ( avg T 2 ) calculated in the C group and the center average temperature ( avg Tc).
  • center average temperature avg Tc 100 deg. C
  • one edge average temperature avg T 1 80 deg. C
  • the other edge average temperature avg T 2 75 deg. C
  • the crack index may be a temperature deviation calculated by the above method, and the crack index is 25 in the above example.
  • the crack index may be determined whether the crack index is equal to or greater than a reference value in operation S240, and it may be determined whether the crack in the longitudinal direction of the slab 20 occurs in operation S250.
  • the reference value may be 20.
  • FIG. 5 shows a case where the reference value is set to 20.
  • the temperature deviation is 20 or more, and it can be interpreted that longitudinal cracking occurred in the corresponding portion of the slab 20. As such, when a crack occurs in the slab 20, the crack may be removed by scarfing the slab 20.
  • the slab crack diagnosis method according to the embodiments of the present invention, it is possible to easily determine whether the slab crack is generated using the temperature deviation of the center portion of the slab and the edge portion of the slab.
  • the slab crack diagnosis method uses a minimum number of temperature sensors to determine the longitudinal crack occurring at the edge of the slab, thereby reducing costs. Will become effective. In addition, efforts and costs can be reduced due to unnecessary scarfing.
  • the crack index can be calculated only by the temperature deviation of the center of the slab and the edge of the slab, so that crack diagnosis can be easily and quickly performed.

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Abstract

A slab crack diagnosing method is disclosed. The slab crack diagnosing method comprises the steps of: measuring a temperature at the central side of a slab short side portion, using a center temperature sensor installed at the central side of a mold short side portion; measuring a temperature at the edge of the slab short side portion, using an edge temperature sensor installed at the edge of the mold short side portion; calculating a crack index, using a temperature deviation between the central side and the edge of the slab short side portion; and determining whether a crack is generated in a lengthwise direction of the slab short side portion or not, by comparing the calculated crack index with a reference value.

Description

슬라브 크랙 진단 방법How to diagnose slavic cracks

본 발명은 슬라브 크랙 진단 방법에 관한 것이다.The present invention relates to a slab crack diagnosis method.

제선공정에서 정련된 용강은 제강공정에서 래들(ladle)로 이송되고, 래들로부터 중간 저장 장치인 턴디쉬(tundish)로 이송된 후, 하나 혹은 두 개 이상의 몰드(mold)에 공급된다. The molten steel refined in the steelmaking process is transferred to a ladle in the steelmaking process, transferred from the ladle to a tundish, which is an intermediate storage device, and then supplied to one or more molds.

이 경우, 용강은 연속주조 설비를 통과하면서 냉각되어 고상의 슬라브(slab)로 응고된다. 연속주조 설비에서 용강은 먼저 수냉몰드를 통과하면서 응고쉘을 형성하고, 이후 스트랜드(strand)를 통과하면 서 냉각수 분사를 통해 나머지가 완전히 응고되어 고상의 슬라브가 된다.In this case, the molten steel is cooled while passing through the continuous casting facility and solidified into a solid slab. In a continuous casting facility, molten steel first forms a solidification shell while passing through a water cooling mold, and then passes through a strand to completely solidify the remaining solid through slab spray to form a solid slab.

턴디쉬는 주입 중인 래들의 모든 용강을 주입한 후 다른 래들로 교환하여 주입할 경우(연연주 조업), 몰드에 연속적으로 용강을 공급해 주므로 중단 없이 슬라브가 생산된다.When the tundish is injected with all the molten steel of the ladle being injected and then exchanged with other ladles (playing operation), the slab is continuously produced by supplying molten steel to the mold.

본 발명의 배경기술은 대한민국 공개특허공보 제10-2013-0009154호(2013.01.23, 연주 설비)에 개시되어 있다.Background art of the present invention is disclosed in Republic of Korea Patent Publication No. 10-2013-0009154 (2013.01.23, playing equipment).

본 발명의 실시예들은, 복수의 온도센서와 크랙 지수를 이용하여 슬라브의 길이 방향 크랙 발생 여부를 판단하는 슬라브 크랙 진단 방법을 제공하는 것이다.Embodiments of the present invention provide a slab crack diagnosis method for determining whether a longitudinal crack of a slab is generated using a plurality of temperature sensors and a crack index.

본 발명의 일 측면에 따르면, 몰드의 단변부 중앙에 설치된 센터온도센서를 이용하여, 슬라브 단변부 중앙의 온도를 측정하는 단계; 상기 몰드 단변부 가장자리에 설치된 엣지온도센서를 이용하여, 상기 슬라브 단변부 가장자리의 온도를 측정하는 단계; 상기 슬라브 단변부 중앙과 상기 슬라브 단변부 가장자리의 온도편차를 이용하여 크랙(crack) 지수를 산출하는 단계; 및 산출된 상기 크랙 지수를 기준값과 비교하여, 상기 슬라브 단변부의 길이 방향 크랙 발생 여부를 판단하는 단계를 포함하는 슬라브 크랙 진단 방법이 제공된다.According to an aspect of the present invention, by using a center temperature sensor installed in the center of the short side of the mold, measuring the temperature of the center of the slab short side; Measuring the temperature of the edge of the slab short side using an edge temperature sensor provided at the edge of the mold short side; Calculating a crack index by using a temperature deviation between the center of the slab short side and the edge of the slab short side; And comparing the calculated crack index with a reference value to determine whether a longitudinal crack occurs in the short side portion of the slab.

상기 센터온도센서와 상기 엣지온도센서는 각각 복수로 이루어지고, 복수의 상기 센터온도센서는, 상기 몰드 단변부 중앙에 상기 몰드 단변부의 길이 방향으로 이격되어 배치되고, 복수의 상기 엣지온도센서는, 상기 몰드 단변부 양 가장자리에 상기 몰드 단변부의 길이 방향으로 복수의 상기 센터온도센서 간격과 동일한 간격으로 이격되어 배치될 수 있다.The center temperature sensor and the edge temperature sensor are each composed of a plurality, the plurality of center temperature sensor, the center of the mold short side portion is disposed spaced apart in the longitudinal direction of the mold short side portion, the plurality of edge temperature sensors, The mold short sides may be spaced apart from the plurality of center temperature sensor intervals in the longitudinal direction of the mold short sides.

상기 크랙(crack) 지수를 산출하는 단계는, 상기 센터온도센서와 상기 엣지온도센서가 상기 몰드 단변부의 폭 방향으로 이루는 행 별로 상기 크랙 지수를 산출하며, 상기 크랙 지수는, 동일한 행에 배치된 상기 센터온도센서와 상기 엣지온도센서에서 측정된 온도의 편차일 수 있다.The calculating of the crack index may include calculating the crack index for each row formed by the center temperature sensor and the edge temperature sensor in the width direction of the mold short side portion, and the crack index may be arranged in the same row. The temperature measured by the center temperature sensor and the edge temperature sensor may be a deviation.

상기 슬라브 단변부의 길이 방향 크랙 발생 여부를 판단하는 단계는, 행 별로 산출된 상기 크랙 지수 중 최댓값이 기준값보다 큰 경우, 상기 슬라브 단변부의 길이 방향 크랙이 발생한 것으로 판단할 수 있다.The determining of the longitudinal crack of the slab short side may include determining that the longitudinal crack of the slab short side is generated when the maximum value of the crack index calculated for each row is larger than a reference value.

상기 엣지온도센서는 상기 몰드 단변부의 양 가장자리에 각각 설치되고, 상기 크랙 지수를 산출하는 단계에서, 상기 크랙 지수는, 상기 몰드 단변부의 양 가장자리에 각각 설치된 상기 엣지온도센서에서 측정되는 온도의 최솟값과 상기 센터온도센서에서 측정되는 온도의 편차일 수 있다.The edge temperature sensors are respectively installed at both edges of the mold short side portion, and in the step of calculating the crack index, the crack index is a minimum value of the temperature measured by the edge temperature sensors respectively installed at both edges of the mold short side portion. It may be a deviation of the temperature measured by the center temperature sensor.

상기 크랙(crack) 지수를 산출하는 단계는, 복수의 상기 센터온도센서에서 측정되는 온도를 이용하여, 상기 슬라브 단변부의 센터평균온도를 산출하는 단계; 복수의 상기 엣지온도센서에서 측정되는 온도를 이용하여, 상기 슬라브 단변부의 엣지평균온도를 산출하는 단계; 및 상기 센터평균온도와 상기 엣지평균온도의 편차를 산출하는 단계를 포함할 수 있다.The calculating of the crack index may include: calculating a center average temperature of the slab short side by using temperatures measured by the plurality of center temperature sensors; Calculating an edge average temperature of the slab short side portion using temperatures measured by a plurality of edge temperature sensors; And calculating a deviation between the center average temperature and the edge average temperature.

상기 엣지온도센서는 상기 몰드 단변부의 양 가장자리에 각각 설치되고, 상기 크랙(crack) 지수를 산출하는 단계에서, 상기 크랙 지수는, 상기 슬라브 단변부의 양 가장자리 각각에 대한 엣지평균온도 중 최솟값과 상기 센터평균온도의 편차일 수 있다.The edge temperature sensor is installed at both edges of the mold short side portion, and in the step of calculating the crack index, the crack index is the minimum value of the edge average temperatures for each edge of the slab short side portion and the center. It may be a deviation of the average temperature.

상기 엣지온도센서는 상기 몰드 단변부의 모서리로부터 50mm 이하로 이격된 위치에 설치될 수 있다.The edge temperature sensor may be installed at a position spaced 50 mm or less from the edge of the mold short side portion.

본 발명의 실시예들에 따르면, 슬라브의 크랙을 진단하기 위한 비용이 절감될 수 있고, 슬라브의 가장자리에서 발생하는 크랙을 정확하게 진단할 수 있다.According to embodiments of the present invention, the cost for diagnosing the crack of the slab can be reduced, and it is possible to accurately diagnose the crack occurring at the edge of the slab.

도 1은 본 발명의 일 실시예에 따른 슬라브 크랙 진단 방법에 사용되는 몰드의 센터온도센서 및 엣지온도센서를 나타낸 도면.1 is a view showing the center temperature sensor and the edge temperature sensor of the mold used in the slab crack diagnosis method according to an embodiment of the present invention.

도 2는 본 발명의 본 발명의 일 실시예에 따른 슬라브 크랙 진단 방법을 나타낸 순서도.Figure 2 is a flow chart showing a slab crack diagnosis method according to an embodiment of the present invention.

도 3은 본 발명의 본 발명의 일 실시예에 따른 슬라브 크랙 진단 방법으로 슬라브 크랙을 진단하는 것을 나타낸 도면.3 is a diagram illustrating diagnosing slab cracks with a slab crack diagnosis method according to an embodiment of the present invention.

도 4는 본 발명의 본 발명의 다른 실시예에 따른 슬라브 크랙 진단 방법을 나타낸 순서도.Figure 4 is a flow chart showing a slab crack diagnosis method according to another embodiment of the present invention.

도 5는 본 발명의 본 발명의 다른 실시예에 따른 슬라브 크랙 진단 방법으로 슬라브 크랙을 진단하는 것을 나타낸 도면.5 is a diagram illustrating diagnosing slab cracks with a slab crack diagnosis method according to another embodiment of the present invention.

본 발명은 다양한 변환을 가할 수 있고 여러 가지 실시예를 가질 수 있는 바, 특정 실시예들을 도면에 예시하고 상세한 설명에 상세하게 설명하고자 한다. 그러나, 이는 본 발명을 특정한 실시 형태에 대해 한정하려는 것이 아니며, 본 발명의 사상 및 기술 범위에 포함되는 모든 변환, 균등물 내지 대체물을 포함하는 것으로 이해되어야 한다. 본 발명을 설명함에 있어서 관련된 공지 기술에 대한 구체적인 설명이 본 발명의 요지를 흐릴 수 있다고 판단되는 경우 그 상세한 설명을 생략한다.As the invention allows for various changes and numerous embodiments, particular embodiments will be illustrated in the drawings and described in detail in the written description. However, this is not intended to limit the present invention to specific embodiments, it should be understood to include all transformations, equivalents, and substitutes included in the spirit and scope of the present invention. In the following description of the present invention, if it is determined that the detailed description of the related known technology may obscure the gist of the present invention, the detailed description thereof will be omitted.

제1, 제2 등의 용어는 다양한 구성요소들을 설명하는데 사용될 수 있지만, 상기 구성요소들은 상기 용어들에 의해 한정되어서는 안 된다. 상기 용어들은 하나의 구성요소를 다른 구성요소로부터 구별하는 목적으로만 사용된다.Terms such as first and second may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

본 출원에서 사용한 용어는 단지 특정한 실시예를 설명하기 위해 사용된 것으로, 본 발명을 한정하려는 의도가 아니다. 단수의 표현은 문맥상 명백하게 다르게 뜻하지 않는 한, 복수의 표현을 포함한다. 본 출원에서, "포함하다" 또는 "가지다" 등의 용어는 명세서상에 기재된 특징, 숫자, 단계, 동작, 구성요소, 부품 또는 이들을 조합한 것이 존재함을 지정하려는 것이지, 하나 또는 그 이상의 다른 특징들이나 숫자, 단계, 동작, 구성요소, 부품 또는 이들을 조합한 것들의 존재 또는 부가 가능성을 미리 배제하지 않는 것으로 이해되어야 한다.The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms "comprise" or "have" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, components, or a combination thereof.

이하, 본 발명에 따른 슬라브 크랙 진단 방법의 실시예를 첨부도면을 참조하여 상세히 설명하기로 하며, 첨부 도면을 참조하여 설명함에 있어, 동일하거나 대응하는 구성 요소는 동일한 도면번호를 부여하고 이에 대한 중복되는 설명은 생략하기로 한다.Hereinafter, an embodiment of a slab crack diagnosis method according to the present invention will be described in detail with reference to the accompanying drawings, in the following description with reference to the accompanying drawings, the same or corresponding components are given the same reference numerals and duplicated thereto. The description will be omitted.

도 1을 참조하면, 본 발명에 따른 슬라브(20) 크랙 진단 방법에 사용되는 몰드(10)의 온도센서는, 센터온도센서(110)와 엣지온도센서(120)를 포함하고, 엣지온도센서(120)는 제1 엣지센서(121)와 제2 엣지센서(122)를 포함할 수 있다.1, the temperature sensor of the mold 10 used in the slab 20 crack diagnosis method according to the present invention includes a center temperature sensor 110 and an edge temperature sensor 120, the edge temperature sensor ( 120 may include a first edge sensor 121 and a second edge sensor 122.

몰드(10)의 상기 온도센서는 몰드(10)의 상부에는 설치되지 않을 수 있다. 턴디쉬에 연결되는 침지노즐이 몰드(10)의 상부에 침지되고 몰드(10)의 상부는 용강과 접촉되지 않으므로, 비용 절감을 위하여 몰드(10) 상부에는 온도센서가 설치되지 않는다.The temperature sensor of the mold 10 may not be installed above the mold 10. Since the immersion nozzle connected to the tundish is immersed in the upper portion of the mold 10 and the upper portion of the mold 10 is not in contact with molten steel, a temperature sensor is not installed on the upper portion of the mold 10 for cost reduction.

센터온도센서(110)는 슬라브(20) 단변부 표면의 중앙 온도를 측정하기 위하여, 몰드(10)의 단변부 중앙에 설치되는 온도센서이다. 센터온도센서(110)는 열전대를 포함할 수 있고, 단위시간 간격으로 슬라브(20) 단변부 중앙의 표면 온도를 측정할 수 있다. 예를 들어, 센터온도센서(110)는 1초 간격으로 슬라브(20) 단변부 중앙의 표면 온도를 측정할 수 있다.The center temperature sensor 110 is a temperature sensor installed at the center of the short side of the mold 10 to measure the center temperature of the surface of the short side of the slab 20. The center temperature sensor 110 may include a thermocouple, and measure the surface temperature of the center of the short side of the slab 20 at unit time intervals. For example, the center temperature sensor 110 may measure the surface temperature at the center of the short side of the slab 20 at intervals of 1 second.

여기서, '중앙'이란 몰드(10) 단변부의 정중앙은 물론 몰드(10) 단변부의 정중앙에서 폭 방향으로 50mm 이하로 떨어진 위치를 포함하는 개념으로 사용된다. 즉, 센터온도센서(110)는 슬라브(20) 단변부의 정중앙에 설치되거나, 물론 몰드(10) 단변부의 정중앙에서 폭 방향으로 50mm 이하로 떨어진 위치에 설치될 수 있다. Here, the term 'center' is used as a concept including a position separated by 50 mm or less in the width direction from the center of the mold 10 short side as well as the center of the mold 10 short side. That is, the center temperature sensor 110 may be installed at the center of the short side of the slab 20 or may be installed at a position 50 mm or less in the width direction from the center of the short side of the mold 10.

센터온도센서(110)는 복수일 수 있다. 복수의 센터온도센서(110)는 몰드(10) 단변부의 길이 방향으로 서로 이격되게 배치될 수 있다. 또한, 복수개의 센터온도센서(110)는 등간격으로 이격되어 배치될 수 있다.Center temperature sensor 110 may be a plurality. The plurality of center temperature sensors 110 may be spaced apart from each other in the longitudinal direction of the short side of the mold 10. In addition, the plurality of center temperature sensors 110 may be spaced apart at equal intervals.

엣지온도센서(120)는 슬라브(20) 단변부 표면의 가장자리 온도를 측정하기 위하여, 몰드(10) 단변부 가장자리에 설치되는 온도 센서로, 센터온도센서(110)와 마찬가지로 열전대일 수 있다. 엣지온도센서(120)는 몰드(10)의 모서리에서 50mm 이하로 이격된 위치에 설치될 수 있다. 엣지온도센서(120)가 몰드(10)의 모서리에서 50mm을 초과하여 이격되는 경우, 슬라브(20)의 모서리측 온도를 정확하게 측정할 수 없다.The edge temperature sensor 120 is a temperature sensor installed at the edge of the mold 10 short side in order to measure the edge temperature of the surface of the short side of the slab 20, and may be a thermocouple similar to the center temperature sensor 110. The edge temperature sensor 120 may be installed at a position spaced 50 mm or less from the edge of the mold 10. When the edge temperature sensor 120 is spaced apart from the corner of the mold 10 by more than 50 mm, the edge temperature of the slab 20 may not be accurately measured.

엣지온도센서(120) 역시 단위시간 예를 들어 1초 간격으로 슬라브(20) 단변부 가장자리의 표면 온도를 측정할 수 있다.The edge temperature sensor 120 may also measure the surface temperature of the edge of the short side of the slab 20 in unit time intervals, for example, 1 second.

엣지온도센서(120)는 복수로 이루어질 수 있으며, 복수의 엣지온도센서(120)는 몰드(10)의 가장자리에, 길이 방향으로 서로 이격되게 배치될 수 있다. 이 경우, 복수개의 엣지온도센서(120)는 등간격으로 이격되어 배치될 수 있다. The edge temperature sensor 120 may be formed in plural, and the plurality of edge temperature sensors 120 may be disposed on the edge of the mold 10 to be spaced apart from each other in the longitudinal direction. In this case, the plurality of edge temperature sensors 120 may be spaced apart at equal intervals.

엣지온도센서(120)는 센터온도센서(110)를 기준으로 양 가장자리에 각각 설치될 수 있으며, 이 경우, 하나를 제1 엣지센서(121)라 하고, 나머지 하나를 제2 엣지센서(122)라 할 수 있다. The edge temperature sensor 120 may be installed at both edges based on the center temperature sensor 110, in which case, one is called the first edge sensor 121 and the other is the second edge sensor 122. It can be said.

제1 엣지센서(121)와 제2 엣지센서(122)는 몰드(10)의 모서리에서 각각 50mm 이하로 이격된 위치에 설치될 수 있다. 예를 들어, 제1 엣지센서(121)는 몰드(10) 좌측 모서리에서 50mm 떨어진 위치에 설치될 수 있고, 제2 엣지센서(122)는 몰드(10) 우측 모서리에서 50mm 떨어진 위치에 설치될 수 있다.The first edge sensor 121 and the second edge sensor 122 may be installed at positions spaced apart from each other by 50 mm or less from an edge of the mold 10. For example, the first edge sensor 121 may be installed at a position 50mm away from the left edge of the mold 10, and the second edge sensor 122 may be installed at a position 50mm away from the right edge of the mold 10. have.

도 2를 참조하면, 본 발명의 일 실시예에 따른 슬라브(20) 크랙 진단 방법은, 센터온도센서(110)를 이용하여 온도를 측정하는 단계(S110), 엣지온도센서(120)를 이용하여 온도를 측정하는 단계(S120), 행 별로 크랙 지수를 산출하는 단계(S130) 및 크랙 발생 여부를 판단하는 단계(S140, S150)를 포함할 수 있다.2, in the slab 20 crack diagnosis method according to an embodiment of the present invention, by measuring the temperature using the center temperature sensor 110 (S110), using the edge temperature sensor 120 The method may include measuring temperature (S120), calculating a crack index for each row (S130), and determining whether cracks have occurred (S140 and S150).

센터온도센서(110)를 이용하여 온도를 측정하는 단계(S110)는 센터온도센서(110)를 이용하여 슬라브(20)의 중앙 온도를 측정하는 단계이다.Measuring the temperature using the center temperature sensor 110 (S110) is a step of measuring the central temperature of the slab 20 using the center temperature sensor 110.

엣지온도센서(120)를 이용하여 온도를 측정하는 단계(S120)는 엣지온도센서(120)를 이용하여 슬라브(20)의 가장자리 온도를 측정하는 단계이다. 엣지온도센서(120)가 몰드(10)의 양 가장자리에 설치되는 경우 슬라브(20)의 양 가장자리 온도를 각각 측정할 수 있다.Measuring the temperature using the edge temperature sensor 120 (S120) is a step of measuring the edge temperature of the slab 20 using the edge temperature sensor 120. When the edge temperature sensor 120 is installed at both edges of the mold 10, the edge temperature of the slab 20 may be measured, respectively.

크랙 지수를 산출하는 단계(S130)는, 슬라브(20)의 길이 방향 크랙이 발생할 가능성에 관한 지수를 산출하는 단계로, 슬라브(20) 중앙과 슬라브(20) 가장자리의 온도편차를 이용하여 산출한다.The step of calculating the crack index (S130) is a step of calculating an index relating to the possibility of longitudinal cracking of the slab 20, and is calculated by using a temperature deviation between the center of the slab 20 and the edge of the slab 20. .

슬라브(20) 단변부의 중앙 부분과 가장자리 부분에서의 온도 차이가 크게 발생하면, 슬라브(20) 단변부에 길이 방향 크랙이 발생하게 될 수 있다. If a large temperature difference occurs at the center portion and the edge portion of the short side portion of the slab 20, a longitudinal crack may occur at the short side portion of the slab 20.

크랙 지수는 센터온도센서(110)와 엣지온도센서(120)에서 각각 측정되는 온도의 편차로 구해질 수 있다. 예를 들어, 센터온도센서(110)에서 측정된 온도가 100℃이고, 엣지온도센서(120)에서 측정된 온도가 90℃이면, 크랙 지수는 10이 될 수 있다.The crack index may be obtained as a deviation of temperatures measured by the center temperature sensor 110 and the edge temperature sensor 120, respectively. For example, if the temperature measured by the center temperature sensor 110 is 100 ° C and the temperature measured by the edge temperature sensor 120 is 90 ° C, the crack index may be 10.

엣지온도센서(120)가 제1 엣지센서(121)와 제2 엣지센서(122)를 포함하는 경우, 크랙 지수는, 제1 엣지센서(121)와 제2 엣지센서(122)에서 각각 측정되는 온도(T1, T2) 중 최솟값과 센터온도센서(110)에서 측정되는 온도(Tc)의 온도편차가 될 수 있다. When the edge temperature sensor 120 includes the first edge sensor 121 and the second edge sensor 122, the crack index is measured by the first edge sensor 121 and the second edge sensor 122, respectively. It may be a temperature deviation between the minimum value of the temperatures (T 1, T 2 ) and the temperature (Tc) measured by the center temperature sensor 110.

예를 들어, 센터온도센서(110)에서 측정된 온도, Tc = 100℃ 이고, 제1 엣지센서(121)에서 측정된 온도, T1 = 80℃, 제2 엣지센서(122)에서 측정된 온도, T2 = 90℃인 경우, 크랙 지수는 100℃와 80℃의 온도 편차인 20이 될 수 있다.For example, the temperature measured by the center temperature sensor 110, Tc = 100 ℃, the temperature measured by the first edge sensor 121, T 1 = 80 ℃, the temperature measured by the second edge sensor 122 If T 2 = 90 ° C., the crack index may be 20, which is a temperature deviation of 100 ° C. and 80 ° C.

센터온도센서(110)와 엣지온도센서(120)가 복수로 이루어지고, 각각이 등간격으로 몰드(10) 단변부 길이 방향으로 이격되게 배치되는 경우, 크랙 지수는 센터온도센서(110)와 엣지온도센서(120)가 몰드(10) 단변부의 폭 방향으로 이루는 행 별로 산출될 수 있다. 즉, 도 1을 참조하면, 크랙 지수(Cn)는 1행, 2행, …, N행 별로 C1, C2, …, CN 와 같이 산출될 수 있다.When the center temperature sensor 110 and the edge temperature sensor 120 is formed in plural, and each of the center temperature sensor 110 and the edge temperature sensor 120 is disposed to be spaced apart in the longitudinal direction of the short side of the mold 10 at equal intervals, the crack index is the center temperature sensor 110 and the edge. The temperature sensor 120 may be calculated for each row formed in the width direction of the short side of the mold 10. That is, referring to FIG. 1, the crack index C n is represented by 1 row, 2 rows,... , C 1 , C 2 ,. , May be calculated as C N.

크랙 발생 여부를 판단하는 단계(S140, S150)는, 크랙 지수가 기준값 이상이 되는지 판단(S140)하여, 슬라브(20)의 길이 방향 크랙이 발생 여부를 판단(S150)할 수 있다. 예를 들어, 기준값은 20이 될 수 있다.In operation S140 or S150, the crack index may be determined to be equal to or greater than a reference value in operation S140 to determine whether a crack in the longitudinal direction of the slab 20 occurs in operation S150. For example, the reference value may be 20.

도 3의 그래프는 기준값을 20으로 설정된 경우를 나타낸다. 주조 시간이 9초, 10초인 지점에서, 크랙 지수는 20 이상이며, 슬라브(20)에 길이 방향 크랙이 발생하였다고 해석된다.The graph of FIG. 3 shows a case where the reference value is set to 20. FIG. At the points where the casting time is 9 seconds and 10 seconds, the crack index is 20 or more, and it is interpreted that a longitudinal crack occurred in the slab 20.

크랙 지수가 기준값 이상으로 판단되어, 슬라브(20)에 길이 방향 크랙이 발생한 것으로 판단되며, 해당 슬라브(20)를 스카핑(scarfing)하여 크랙을 제거할 수 있다.The crack index is determined to be greater than or equal to the reference value, and thus it is determined that the longitudinal crack has occurred in the slab 20, and the crack may be removed by scarfing the slab 20.

한편, 크랙 지수가 센터온도센서(110)와 엣지온도센서(120)가 상기 슬라브(20) 단변부의 폭 방향으로 이루는 행 별로 산출되는 경우, 행 별로 산출된 크랙 지수 중 최댓값을 기준값과 비교할 수 있다.Meanwhile, when the crack index is calculated for each row of the center temperature sensor 110 and the edge temperature sensor 120 in the width direction of the short side of the slab 20, the maximum value of the crack index calculated for each row may be compared with a reference value. .

예를 들어, 행이 4행까지 존재하고, C1=10, C2=20, C3=25, C4=10인 경우, 크랙 지수 중 최댓값인 25를 기준값을 비교하게 된다. 기준값이 20인 경우 해당 슬라브(20)에 크랙이 발생한 것으로 판단한다.For example, there are up to four rows, C 1 = 10, C 2 = 20, C 3 = 25, When C 4 = 10, the reference value is compared to 25, the maximum value of the crack indices. If the reference value is 20, it is determined that a crack has occurred in the slab 20.

도 4를 참조하면, 본 발명의 다른 실시예에 따른 슬라브(20) 크랙 진단 방법은, 센터온도센서(110)를 이용하여 온도를 측정하는 단계(S210), 엣지온도센서(120)를 이용하여 온도를 측정하는 단계(S220), 크랙 지수를 산출하는 단계(S230) 및 크랙 발생 여부를 판단하는 단계(S240, S250)를 포함할 수 있다.Referring to FIG. 4, in the slab 20 crack diagnosis method according to another exemplary embodiment of the present invention, the temperature is measured using the center temperature sensor 110 (S210) and the edge temperature sensor 120 is used. It may include the step of measuring the temperature (S220), the step of calculating the crack index (S230) and determining whether the crack occurs (S240, S250).

센터온도센서(110)를 이용하여 온도를 측정하는 단계(S210), 복수의 센터온도센서(110)를 이용하여 슬라브(20)의 중앙 온도를 측정하는 단계이다.Measuring the temperature using the center temperature sensor 110 (S210), the step of measuring the central temperature of the slab 20 using a plurality of center temperature sensor 110.

엣지온도센서(120)를 이용하여 온도를 측정하는 단계(S220)는, 복수의 엣지온도센서(120)를 이용하여 슬라브(20)의 가장자리 온도를 측정하는 단계이다.Measuring the temperature using the edge temperature sensor 120 (S220) is a step of measuring the edge temperature of the slab 20 using the plurality of edge temperature sensors 120.

크랙 지수를 산출하는 단계(S230)는, 센터평균온도 및 엣지평균온도를 산출하는 단계(S231) 및 온도편차를 산출하는 단계(S232)를 포함할 수 있다.The calculating of the crack index (S230) may include calculating a center average temperature and an edge average temperature (S231) and calculating a temperature deviation (S232).

센터평균온도 및 엣지평균온도를 산출하는 단계(S231)는, 복수의 센터온도센서(110)에서 측정되는 온도를 이용하여 슬라브(20) 단변부의 센터평균온도를 산출하고, 복수의 엣지온도센서(120)에서 측정되는 온도를 이용하여 슬라브(20) 단변부의 엣지평균온도를 산출하는 단계이다.In the calculating of the center average temperature and the edge average temperature (S231), the center average temperature of the short sides of the slab 20 is calculated using the temperatures measured by the plurality of center temperature sensors 110, and the plurality of edge temperature sensors ( Computing the edge average temperature of the short side portion of the slab 20 by using the temperature measured in (120).

도 1을 참조하면, 센터평균온도는 복수의 센터온도센서(110) 즉, A 그룹에서 측정되는 온도의 평균이고, 엣지평균온도는 복수의 엣지온도센서(120)에서 각각 측정되는 온도의 평균이다. Referring to FIG. 1, a center average temperature is an average of temperatures measured by a plurality of center temperature sensors 110, that is, a group A, and an edge average temperature is an average of temperatures respectively measured by a plurality of edge temperature sensors 120. .

엣지온도센서(120)는 복수의 제1 엣지센서(121)로 이루어진 B 그룹과 복수의 제2 엣지센서(122)로 이루어진 C 그룹을 포함할 수 있다. 엣지평균온도는 B 그룹과 C 그룹에서 각각 산출될 수 있다.The edge temperature sensor 120 may include a B group consisting of a plurality of first edge sensors 121 and a C group consisting of a plurality of second edge sensors 122. Edge average temperature can be calculated in Group B and Group C, respectively.

온도편차를 산출하는 단계(S232)는, 센터평균온도와 엣지평균온도의 편차를 산출하는 단계이다.Computing the temperature deviation (S232) is a step of calculating the deviation between the center average temperature and the edge average temperature.

엣지온도센서(120)가 복수의 제1 엣지센서(121)로 이루어진 B 그룹과 복수의 제2 엣지센서(122)로 이루어진 C 그룹을 포함하는 경우, 상기 단계에서 산출되는 온도편차는, B 그룹에서 산출되는 엣지평균온도(avgT1)와 C 그룹에서 산출되는 엣지평균온도(avgT2) 중 작은 값과 센터평균온도(avgTc)와의 편차로 산출될 수 있다.When the edge temperature sensor 120 includes a B group consisting of a plurality of first edge sensors 121 and a C group consisting of a plurality of second edge sensors 122, the temperature deviation calculated in the step is B group It may be calculated as a deviation between the smaller of the edge average temperature ( avg T 1 ) and the average edge temperature ( avg T 2 ) calculated in the C group and the center average temperature ( avg Tc).

예를 들어, 센터평균온도 avgTc = 100℃이고, 하나의 엣지평균온도 avgT1 = 80℃이며, 다른 하나의 엣지평균온도 avgT2 = 75℃인 경우, 온도편차는 100-75=25℃가 된다. For example, center average temperature avg Tc = 100 deg. C, one edge average temperature avg T 1 = 80 deg. C, and the other edge average temperature avg T 2 = 75 deg. C, the temperature deviation is 100-75 = 25 deg.

여기서 크랙 지수는 상기와 같은 방법으로 산출되는 온도편차일 수 있으며, 상기의 예에서 크랙 지수는 25가 된다.The crack index may be a temperature deviation calculated by the above method, and the crack index is 25 in the above example.

크랙 발생 여부를 판단하는 단계(S240, S250)는, 크랙 지수가 기준값 이상이 되는지 판단(S240)하여, 슬라브(20)의 길이 방향 크랙이 발생 여부를 판단(S250)할 수 있다. 예를 들어, 기준값은 20이 될 수 있다.In operation S240 or S250, the crack index may be determined whether the crack index is equal to or greater than a reference value in operation S240, and it may be determined whether the crack in the longitudinal direction of the slab 20 occurs in operation S250. For example, the reference value may be 20.

도 5는 기준값을 20으로 설정한 경우를 도시하고 있다. 주조 시간이 10초인 지점에서, 온도편차는 20 이상이며, 슬라브(20)의 해당 부분에 길이 방향 크랙이 발생하였다고 해석될 수 있다. 이와 같이, 슬라브(20)에 크랙이 발생한 경우, 해당 슬라브(20)를 스카핑하여 크랙을 제거할 수 있다.5 shows a case where the reference value is set to 20. FIG. At the point where the casting time is 10 seconds, the temperature deviation is 20 or more, and it can be interpreted that longitudinal cracking occurred in the corresponding portion of the slab 20. As such, when a crack occurs in the slab 20, the crack may be removed by scarfing the slab 20.

상술한 바와 같이, 본 발명의 실시예들에 따른 슬라브 크랙 진단 방법에 의하면, 슬라브의 중앙부와 슬라브의 가장자리부의 온도 편차를 이용하여 간편하게 슬라브 크랙 발생 여부를 판단할 수 있다. As described above, according to the slab crack diagnosis method according to the embodiments of the present invention, it is possible to easily determine whether the slab crack is generated using the temperature deviation of the center portion of the slab and the edge portion of the slab.

슬라브의 크랙은 슬라브의 가장자리에서 발생할 가능성이 높고, 본 발명의 실시예들에 따른 슬라브 크랙 진단 방법은, 슬라브 가장자리에서 발생하는 길이 방향 크랙을 판단하기 위한 최소한의 온도센서 개수를 이용하고 있으므로 비용 절감의 효과가 있게 된다. 나아가 불필요한 스카핑으로 인한 노력과 비용의 절감이 도모될 수 있다.Cracks in the slab are more likely to occur at the edge of the slab, and the slab crack diagnosis method according to the embodiments of the present invention uses a minimum number of temperature sensors to determine the longitudinal crack occurring at the edge of the slab, thereby reducing costs. Will become effective. In addition, efforts and costs can be reduced due to unnecessary scarfing.

한편, 상대적으로 온도가 일정한 슬라브 중앙의 온도를 기준으로 하여 슬라브 가장자리의 크랙을 진단함으로써 어느 지점의 가장자리에서도 정확한 진단이 가능하다. 또한, 크랙 지수는 슬라브 중앙과 슬라브 가장자리의 온도 편차만으로도 산출될 수 있으므로 크랙 진단을 쉽고 빠르게 할 수 있게 된다.On the other hand, by diagnosing cracks at the edge of the slab on the basis of the temperature at the center of the slab with a relatively constant temperature, accurate diagnosis is possible at any edge. In addition, the crack index can be calculated only by the temperature deviation of the center of the slab and the edge of the slab, so that crack diagnosis can be easily and quickly performed.

이상, 본 발명의 일 실시예에 대하여 설명하였으나, 해당 기술 분야에서 통상의 지식을 가진 자라면 특허청구범위에 기재된 본 발명의 사상으로부터 벗어나지 않는 범위 내에서, 구성 요소의 부가, 변경, 삭제 또는 추가 등에 의해 본 발명을 다양하게 수정 및 변경시킬 수 있을 것이며, 이 또한 본 발명의 권리범위 내에 포함된다고 할 것이다.As mentioned above, although an embodiment of the present invention has been described, those of ordinary skill in the art may add, change, delete or add components within the scope not departing from the spirit of the present invention described in the claims. The present invention may be modified and changed in various ways, etc., which will also be included within the scope of the present invention.

<부호의 설명><Description of the code>

10: 몰드10: Mold

20: 슬라브20: slab

110: 센터온도센서110: center temperature sensor

120: 엣지온도센서120: edge temperature sensor

121: 제1 엣지센서121: first edge sensor

Claims (8)

몰드의 단변부 중앙에 설치된 센터온도센서를 이용하여, 슬라브 단변부 중앙의 온도를 측정하는 단계;Measuring a temperature at the center of the slab short side by using a center temperature sensor installed at the center of the short side of the mold; 상기 몰드 단변부 가장자리에 설치된 엣지온도센서를 이용하여, 상기 슬라브 단변부 가장자리의 온도를 측정하는 단계;Measuring the temperature of the edge of the slab short side using an edge temperature sensor provided at the edge of the mold short side; 상기 슬라브 단변부 중앙과 상기 슬라브 단변부 가장자리의 온도편차를 이용하여 크랙(crack) 지수를 산출하는 단계; 및Calculating a crack index by using a temperature deviation between the center of the slab short side and the edge of the slab short side; And 산출된 상기 크랙 지수를 기준값과 비교하여, 상기 슬라브 단변부의 길이 방향 크랙 발생 여부를 판단하는 단계를 포함하는 슬라브 크랙 진단 방법.And comparing the calculated crack index with a reference value to determine whether a longitudinal crack occurs in the short side portion of the slab. 제1항에 있어서,The method of claim 1, 상기 센터온도센서와 상기 엣지온도센서는 각각 복수로 이루어지고,The center temperature sensor and the edge temperature sensor are each made of a plurality, 복수의 상기 센터온도센서는, 상기 몰드 단변부 중앙에 상기 몰드 단변부의 길이 방향으로 이격되어 배치되고, A plurality of the center temperature sensor is disposed in the center of the mold short side portion spaced apart in the longitudinal direction of the mold short side portion, 복수의 상기 엣지온도센서는, 상기 몰드 단변부 양 가장자리에 상기 몰드 단변부의 길이 방향으로 복수의 상기 센터온도센서 간격과 동일한 간격으로 이격되어 배치되는 것을 특징으로 하는 슬라브 크랙 진단 방법.The plurality of edge temperature sensors, the slab crack diagnosis method characterized in that disposed on both sides of the mold short side portion spaced at the same interval as the plurality of the center temperature sensor interval in the longitudinal direction of the mold short side portion. 제2항에 있어서,The method of claim 2, 상기 크랙(crack) 지수를 산출하는 단계는,Computing the crack index (crack), 상기 센터온도센서와 상기 엣지온도센서가 상기 몰드 단변부의 폭 방향으로 이루는 행 별로 상기 크랙 지수를 산출하며,The center temperature sensor and the edge temperature sensor calculates the crack index for each row formed in the width direction of the mold short side portion, 상기 크랙 지수는, 동일한 행에 배치된 상기 센터온도센서와 상기 엣지온도센서에서 측정된 온도의 편차인 것을 특징으로 하는 크랙 진단 방법.The crack index is a crack diagnostic method, characterized in that the deviation of the temperature measured by the center temperature sensor and the edge temperature sensor arranged in the same row. 제3항에 있어서,The method of claim 3, 상기 슬라브 단변부의 길이 방향 크랙 발생 여부를 판단하는 단계는,Determining whether or not a longitudinal crack occurs in the slab short side portion, 행 별로 산출된 상기 크랙 지수 중 최댓값이 기준값보다 큰 경우, 상기 슬라브 단변부의 길이 방향 크랙이 발생한 것으로 판단하는 것을 특징으로 하는 크랙 진단 방법.And if the maximum value of the crack indices calculated for each row is greater than a reference value, it is determined that a longitudinal crack of the slab short side portion has occurred. 제1항에 있어서,The method of claim 1, 상기 엣지온도센서는 상기 몰드 단변부의 양 가장자리에 각각 설치되고,The edge temperature sensor is installed on each edge of the mold short side, 상기 크랙 지수를 산출하는 단계에서,In calculating the crack index, 상기 크랙 지수는, 상기 몰드 단변부의 양 가장자리에 각각 설치된 상기 엣지온도센서에서 측정되는 온도의 최솟값과 상기 센터온도센서에서 측정되는 온도의 편차인 것을 특징으로 하는 슬라브 크랙 진단 방법.The crack index is a slab crack diagnosis method, characterized in that the deviation between the minimum value of the temperature measured by the edge temperature sensor and the temperature measured by the center temperature sensor respectively installed on both edges of the mold short side portion. 제2항에 있어서,The method of claim 2, 상기 크랙(crack) 지수를 산출하는 단계는, Computing the crack index (crack), 복수의 상기 센터온도센서에서 측정되는 온도를 이용하여, 상기 슬라브 단변부의 센터평균온도를 산출하는 단계;Calculating a center average temperature of the slab short sides by using a temperature measured by a plurality of center temperature sensors; 복수의 상기 엣지온도센서에서 측정되는 온도를 이용하여, 상기 슬라브 단변부의 엣지평균온도를 산출하는 단계; 및Calculating an edge average temperature of the slab short side portion using temperatures measured by a plurality of edge temperature sensors; And 상기 센터평균온도와 상기 엣지평균온도의 편차를 산출하는 단계를 포함하는 것을 특징으로 하는 슬라브 크랙 진단 방법.Slab crack diagnosis method comprising the step of calculating the deviation between the center average temperature and the edge average temperature. 제6항에 있어서,The method of claim 6, 상기 엣지온도센서는 상기 몰드 단변부의 양 가장자리에 각각 설치되고,The edge temperature sensor is installed on each edge of the mold short side portion, 상기 크랙(crack) 지수를 산출하는 단계에서,In calculating the crack index, 상기 크랙 지수는, 상기 슬라브 단변부의 양 가장자리 각각에 대한 엣지평균온도 중 최솟값과 상기 센터평균온도의 편차인 것을 특징으로 하는 크랙 진단 방법.The crack index is a crack diagnostic method, characterized in that the deviation between the minimum value and the center average temperature of the edge average temperature for each edge of the slab short side portion. 제1항에 있어서,The method of claim 1, 상기 엣지온도센서는 상기 몰드 단변부의 모서리로부터 50mm 이하로 이격된 위치에 설치되는 것을 특징으로 하는 슬라브 크랙 진단 방법.The edge temperature sensor is a slab crack diagnosis method, characterized in that installed in a position spaced apart from the edge of the mold short side portion 50mm or less.
PCT/KR2014/000776 2013-04-30 2014-01-28 Slab crack diagnosing method Ceased WO2014178522A1 (en)

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