KR20010064341A - Eddy current sensor for inspection a wire surface - Google Patents

Eddy current sensor for inspection a wire surface Download PDF

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KR20010064341A
KR20010064341A KR1019990064516A KR19990064516A KR20010064341A KR 20010064341 A KR20010064341 A KR 20010064341A KR 1019990064516 A KR1019990064516 A KR 1019990064516A KR 19990064516 A KR19990064516 A KR 19990064516A KR 20010064341 A KR20010064341 A KR 20010064341A
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sensor
coil
eddy current
current sensor
bobbin
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KR1019990064516A
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KR100442642B1 (en
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신영범
김정환
배진수
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이구택
포항종합제철 주식회사
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
    • G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
    • G01N27/90—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents
    • G01N27/9006—Details, e.g. in the structure or functioning of sensors

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  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
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  • Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)

Abstract

PURPOSE: An eddy current sensor for inspecting a wire rod surface defect is provided to improve the precision of the inspection by differentiating the wiring density of the eddy sensor coil between a center part and edge parts and manufacturing the sensor with titanium sleeve. CONSTITUTION: An eddy current sensor for inspecting a wire rod surface defect includes a sensor coil formed of a magnetizing coil(1) and a detection coil(2) and wound on a sensor main body, wherein the magnetizing coil wound on a bobbin(3) in such a manner that a wiring density is higher at both ends of the bobbin than in the center of the bobbin, the detection coil connected to resistors in serial for preventing the resonance in a frequency band, and a wiring number of the sensor coil is maintained to have a same impedance regardless of the size of the sensor main body.

Description

선재 표면흠 검사용 와전류 센서{Eddy current sensor for inspection a wire surface}Eddy current sensor for inspection a wire surface}

본 발명은 선재 표면흠 검사용 와전류 센서에 관한 것으로서, 보다 상세하게는 선재 표면흠 검사용 센서를 통과하는 선재(제품)의 표면흠을 검출하는 선재 표면흠 검사용 와전류 센서에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an eddy current sensor for inspecting wire rod surface defects, and more particularly, to an eddy current sensor for inspecting wire rod surface defects for detecting surface defects of a wire rod (product) passing through the wire rod surface defect inspection sensor.

일반적으로, 표면흠을 검출하고자 하는 방법으로는 와전류를 이용한 방법이 많이 사용된다.In general, a method using an eddy current is widely used as a method for detecting surface defects.

상기 와전류를 이용하여 열간 선재의 표면흠을 탐상하기 위해서는 와전류 센서를 많이 사용하게 되는 바, 상기 센서는 하기한 조건을 만족하는 것이 최선이 된다.In order to detect the surface defect of the hot wire by using the eddy current, an eddy current sensor is frequently used, and it is best for the sensor to satisfy the following conditions.

첫째, 검사대상인 선재의 아주 미세한 흠까지 검출해야 하며, 고속으로 관통하는 선재의 진동에도 좋은 S/N(신호대 잡음비)를 만족해야 하는 바, 센서의 권선폭은 좁아야 하며 통과성능을 좋게하기 위해 센서 몸체의 폭도 최소한으로 작게 하여야 한다.First, even the smallest flaws of the wire to be inspected should be detected, and the S / N (signal-to-noise ratio), which is good for the vibration of the wire that passes through at high speed, must be satisfied.The winding width of the sensor must be narrow and the pass performance can be improved. The width of the sensor body should also be kept to a minimum.

둘째, 열간 소재를 대상으로 검사하기 때문에 센서의 냉각 성능이 우수해야 하고, 와전류 센서의 특성상 온도에 민감하기 때문에 항상 상온을 유지시켜 주어야 한다.Second, because the inspection of the hot material, the cooling performance of the sensor should be excellent, and the room temperature should always be maintained because it is sensitive to temperature due to the characteristics of the eddy current sensor.

셋째, 코일의 권선용 보빈은 내열성과 절연성 모두를 만족해야 한다.Third, the winding bobbin of the coil must satisfy both heat resistance and insulation.

넷째, 고속으로 통과하는 소재로부터 센서를 보호하기 위해 강도가 우수하고비자성 물질의 슬리브를 사용해야 한다.Fourth, a high-strength, non-magnetic sleeve should be used to protect the sensor from materials passing at high speeds.

그러나, 종래의 와전류 센서는 상기 조건들을 모두 만족하지 못하고 있기 때문에, 와전류 센서를 이용한 표면흠 검출 효율이 낮은 문제점이 있다.However, since the conventional eddy current sensor does not satisfy all of the above conditions, there is a problem that the surface defect detection efficiency using the eddy current sensor is low.

따라서, 본 발명의 목적은 상기한 문제점을 해결하기 위한 것으로서, 상기 4가지의 조건을 완벽하게 만족시킬 수 있는 선재 표면흠 검사용 와전류 센서를 제공함에 있다.Accordingly, an object of the present invention is to solve the above problems, and to provide an eddy current sensor for inspecting wire rod surface defects that can completely satisfy the four conditions.

도 1은 표면흠 검사용 와전류 센서의 개념도이고,1 is a conceptual diagram of an eddy current sensor for surface defect inspection,

도 2는 본 발명의 센서 코일의 구조이고,2 is a structure of a sensor coil of the present invention,

도 3은 본 발명의 센서 내부 코일의 단면도이고,3 is a cross-sectional view of the sensor internal coil of the present invention,

도 4는 본 발명의 전체 조립도이고,4 is an overall assembly view of the present invention,

도 5는 본 발명의 단면도이고,5 is a cross-sectional view of the present invention,

도 6은 본 발명의 센서 몸체 부품 표시 단면도이고,6 is a sectional view showing the sensor body component of the present invention,

도 7은 본 발명의 센서 커버 부품 표시 단면도이고,7 is a sectional view showing a sensor cover part of the present invention,

도 8은 본 발명의 센서 보빈 부품 표시 단면도이며,8 is a cross-sectional view of the sensor bobbin component of the present invention,

도 9는 슬리브를 도시한 단면도.9 is a sectional view of the sleeve;

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

1 : 자화 코일 2 : 검출 코일1: magnetization coil 2: detection coil

3 : 열간 선재 3': 센서 보빈(Bobbin)3: hot wire 3 ': sensor bobbin

3" : 임피던스(Impedance) 변환용 저항3 ": Impedance conversion resistor

4 : 자력선 10 : 센서 몸체(Body)4: magnetic field line 10: sensor body

20 : 센서 커버(Cover) 40 : 티타늄 슬리브20: sensor cover 40: titanium sleeve

상기 목적을 실현하기 위하여 본 발명은 센서몸체에 자화코일과 검출코일로 이루어진 센서코일을 권취하여 구성함으로써 열간선재의 표면흠을 탐상하는 선재 표면흠 검사용 와전류 센서에 있어서, 상기 자화코일을 권선함에 있어 보빈 양끝의 권선밀도가 보빈 가운데 보다 높게 권선하고, 상기 검출코일에 있어 코일의 끝에 저항을 직렬로 연결함으로써 사용 주파수대역에서의 공진현상을 막으며, 상기 센서코일의 권선수는 소재 크기에 무관하게 동일한 임피던스값을 가지도록 구성함을 특징으로 한다.In order to realize the above object, the present invention provides a wire wound surface eddy current sensor for inspecting surface flaws of hot wires by winding a sensor coil composed of magnetization coils and detection coils on a sensor body. The winding density of both ends of the bobbin is wound higher than the middle of the bobbin, and a resistance is connected to the end of the coil in series in the detection coil to prevent resonance in the frequency band used, and the number of windings of the sensor coil is independent of the material size. It is characterized in that it is configured to have the same impedance value.

도 2에서 도 8은 본 발명에 따른 선재 표면흠 검사용 와전류 센서를 도시한 도면으로서, 상기 조건들을 만족하기 위한 구성을 도면에 따라 설명한다.2 to 8 are diagrams illustrating an eddy current sensor for inspecting wire rod surface defects according to the present invention, and a configuration for satisfying the above conditions will be described with reference to the drawings.

첫째, 센서 코일은 관통형 와전류 탐상 방식이며, 와전류 발생을 위한 1차 코일과 표면흠에 의한 와전류의 변화를 검출하는 차동형 2차코일로 이루어져 있다. 차동형 2차 코일은 두 코일로 이루어져 있는데, 각 코일은 서로 방향이 반대로 감겨져 출력 전압은 두 코일에 여기된 전압의 차가 된다. 이런 차동형 2차 코일은 미세한 와전류의 변화를 검출함으로써 미세결함까지 검출이 가능하고, 신호대 잡음비(S/N)가 높으며 소재의 진동에 둔감하다.First, the sensor coil is a through-type eddy current flaw detection method, and is composed of a primary coil for generating eddy current and a differential secondary coil for detecting a change in eddy current caused by surface defects. The differential secondary coil consists of two coils, each of which is wound in opposite directions so that the output voltage is the difference between the voltages excited by the two coils. Such differential secondary coils can detect minute defects by detecting small changes in eddy currents, have a high signal-to-noise ratio (S / N), and are insensitive to material vibration.

신호대 잡음비를 높이기 위한 방법으로 1차 자화코일의 권선에 있어 보빈(3') 양끝은 누설 자장이 많기 때문에, 자속밀도가 낮게 되는데 이는 정확한 검출에 장애가 된다. 따라서, 고른 자장을 유지하기 위해서 도 3과 같이 양끝을 가운데보다 밀도가 높게 감는다.In order to increase the signal-to-noise ratio, both ends of the bobbin (3 ') in the winding of the primary magnetization coil have a high leakage magnetic field, so that the magnetic flux density is low, which is an obstacle to accurate detection. Therefore, in order to maintain an even magnetic field, as shown in FIG.

도 1, 2, 3은 센서 코일의 구조를 나타내고 있는 바, 선재의 미세흠을 검출하기 위하여 센서 코일의 폭은 작아야 한다. 즉, 작은 공간에서 선재 표면흠 검사용 센서로서의 기능을 하기 위한 전기, 기계적 설계요구가 반영되어야 한다. 도 2의 저항은 사용하는 주파수에서 코일의 공진현상을 막기 위해 사용된다.1, 2 and 3 show the structure of the sensor coil, the width of the sensor coil should be small in order to detect fine scratches of the wire rod. In other words, electrical and mechanical design needs to be reflected in a small space to function as a sensor for inspecting wire rod surface defects. 2 is used to prevent the resonance of the coil at the frequency used.

둘째, 피 검사대상인 열간 선재의 고열에 의해, 표면흠을 검출하기 위한 센서에 직접적인 열이 전도되지 않게 하기 위해 냉각수(Water)를 공급한다.Second, water is supplied to prevent direct heat conduction to the sensor for detecting surface defects due to the high heat of the hot wire to be inspected.

도 6은 센서 몸체(10)의 상세도면이며, 상부에 냉각수의 입구(10')와 출구(10")가 홀 가공이 되어 있으며, 이 때 유량의 흐름을 원활하게 하기 위하여 홀의 각도를 11。 ∼ 12。로 하였다. 또한, 오링(O-Ring)을 사용하여 방수를 해결하고, 센서 몸체(10)의 재질은 열전도율이 높은 황동(Bs)를 사용하여 냉각의 효율성을 높였다.6 is a detailed view of the sensor body 10, in which the inlet 10 'and the outlet 10 " of the cooling water are holed at the top thereof, and the angle of the hole is 11 ° in order to smooth the flow of the flow. In addition, O-ring was used to solve the waterproofing, and the material of the sensor body 10 was made of brass (Bs) having high thermal conductivity to increase cooling efficiency.

도 7은 센서 커버(20)의 상세 도면이며, "A"는 냉각수의 흐름을 원활하게 하기 위하여 90。 방향으로 4개소에 구멍(Hole)을 가공하였다. 이렇게 함으로써 냉각수가 회전돌기가 형성되어 냉각 효과를 극대화 할 수 있다. 또한, 오링을 사용하여 방수 성능을 발휘할 수 있고, 센서 커버(20)는 소재의 충격으로부터 보호하기 위해 높은 강도의 SKD61종을 사용하여 진공 열처리 및 연삭을 하였다. 이 모든 냉각 기능은 좁은 센서에 효과적으로 집약되어 성능을 발휘하고 있다.Fig. 7 is a detailed view of the sensor cover 20, in which " A " processes holes at four locations in the 90 [deg.] Direction to smoothly flow the cooling water. In this way, the cooling water is formed with a rotational projection to maximize the cooling effect. In addition, the O-ring can be used to exhibit waterproof performance, and the sensor cover 20 was vacuum heat treated and ground using SKD61 of high strength in order to protect it from the impact of the material. All of these cooling functions are effectively integrated into a narrow sensor for performance.

셋째, 도 8은 센서 보빈(3')의 상세 도면인 바, 와전류를 발생시키는 코일을 감는 틀인 보빈의 재질은 내열성이 높고 절연물질인 테프론(Teflon)을 사용하였다.Third, Figure 8 is a detailed view of the sensor bobbin (3 '), the material of the bobbin, a frame for winding the coil for generating the eddy current used a high heat resistance and insulating material Teflon (Teflon).

넷째, 선재 통과시 보빈(3')에 가해지는 충격과 고열로부터 센서 코일을 보호하기 위해 도 9와 같이 슬리브(Sleeve)(40)를 사용하였다.Fourth, a sleeve 40 was used as shown in FIG. 9 to protect the sensor coil from the shock and high heat applied to the bobbin 3 'when passing through the wire rod.

도 9는 센서 슬리브(40)의 상세 도면이고, 슬리브(40)의 재질은 티타늄을 사용한다. 티타늄은 투자율이 거의 0에 가까워서 와전류를 이용한 센서의 신호에 전혀 영향을 주지 않고, 높은 S/N를 가져다 주며 경도가 높아 고속으로 진행하는 소재로부터 센서를 보호하기에 적합한 소재이다.9 is a detailed view of the sensor sleeve 40, and the material of the sleeve 40 uses titanium. Titanium has a permeability of nearly zero, which does not affect the sensor's signal using eddy currents at all. It has high S / N and high hardness, making it suitable for protecting the sensor from high-speed materials.

이상과 같이 본 발명은 와전류 센서 코일의 권취 밀도를 중앙과 가장 자리가 상이하도록 함과 아울러 티타늄 슬리브 등을 사용하여 센서를 제작함으로써, 선재 표면흠 검사 정밀도가 향상되는 장점이 있다.As described above, the present invention has the advantage that the winding density of the eddy current sensor coil is different from the center and the edge, and the sensor is manufactured using a titanium sleeve or the like, thereby improving the wire surface surface inspection accuracy.

Claims (3)

센서몸체에 자화코일과 검출코일로 이루어진 센서코일을 권취하여 구성함으로써 열간선재의 표면흠을 탐상하는 선재 표면흠 검사용 와전류 센서에 있어서,In the eddy current sensor for inspecting wire rod surface flaw, which detects the surface flaw of hot wire rod by winding and constructing a sensor coil composed of magnetization coil and detection coil on the sensor body, 상기 자화코일을 권선함에 있어 보빈 양끝의 권선밀도가 보빈 가운데 보다 높게 권선하고, 상기 검출코일에 있어 코일의 끝에 저항을 직렬로 연결함으로써 사용 주파수대역에서의 공진현상을 막으며, 상기 센서코일의 권선수는 소재 크기에 무관하게 동일한 임피던스값을 가지도록 구성하는 것을 특징으로 하는 선재 표면흠 검사용 와전류 센서.In winding the magnetizing coil, the winding density of both ends of the bobbin is wound higher than the middle of the bobbin, and a resistance is connected in series at the end of the coil in the detection coil to prevent resonance phenomenon in the frequency band used, and the winding of the sensor coil The bow is an eddy current sensor for inspecting surface scratches of a wire rod, characterized in that configured to have the same impedance value regardless of the size of the material. 제1항에 있어서, 상기 와전류 센서몸체는 열간선재의 고열로부터 센서를 보호하기 위해 냉각수의 입구와 출구가 형성되어 냉각수가 공급되고, 상기 입구 및 출구의 유량흐름을 원활하게 하기 위하여 홀의 각도를 11。 ~ 12。로 하는 것을 특징으로 하는 선재 표면흠 검사용 와전류 센서.The method of claim 1, wherein the eddy current sensor body is formed to the inlet and outlet of the cooling water to protect the sensor from the high heat of the hot wire is supplied with the cooling water, the angle of the hole to smooth the flow of the inlet and outlet 11 Eddy current sensor for inspecting wire scratches of wires. 제1항 또는 제2항에 있어서, 상기 자화코일과 상기 검출코일이 권취되는 센서보빈의 재질은 내열성이 높고 절연물질인 테프론을 사용하고, 소재의 충격과 고열로부터 상기 센서코일을 보호하기 위해 티타늄 슬리브를 사용하는 것을 특징으로 하는 선재 표면흠 검사용 와전류 센서.The material of the sensor bobbin in which the magnetization coil and the detection coil are wound is made of Teflon, which is high in heat resistance and insulating material, and is made of titanium to protect the sensor coil from impact and high temperature. An eddy current sensor for inspecting wire scratches on a wire rod, characterized by using a sleeve.
KR10-1999-0064516A 1999-12-29 1999-12-29 Eddy current sensor for inspection a wire surface KR100442642B1 (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100742845B1 (en) * 2006-07-24 2007-07-25 주식회사 포스코 Device for connecting wire rod's surface flaws detector and guider of the detector
KR100843875B1 (en) * 2005-11-29 2008-07-04 주식회사 포스코 Device for Detecting the Surface Flaws of Air Guide Type
KR100977738B1 (en) * 2008-03-31 2010-08-24 홍석중 Magnetic saturation measuring instrument for hard metal
US8269831B2 (en) 2005-11-29 2012-09-18 Posco Wire guider of air guide type
CN104807878A (en) * 2015-03-24 2015-07-29 肖勤 Sensor for damage detection of braided steel wire rope
EP3715815A1 (en) 2019-04-08 2020-09-30 Airbus Defence And Space, S.A.U. System and method for monitoring the degradation status of refueling hoses

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Publication number Priority date Publication date Assignee Title
US4024470A (en) * 1974-05-20 1977-05-17 Republic Steel Corporation Eddy current detector for hot test pieces having coolant fluid and purge features
JPS6078353A (en) * 1983-10-05 1985-05-04 Hitachi Ltd Eddy current-type current meter
JPH0737963B2 (en) * 1989-09-29 1995-04-26 原電子測器株式会社 Eddy current flaw detection coil device
JPH07311180A (en) * 1994-05-19 1995-11-28 Hitachi Cable Ltd Eddy current flaw detection coil

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100843875B1 (en) * 2005-11-29 2008-07-04 주식회사 포스코 Device for Detecting the Surface Flaws of Air Guide Type
US8269831B2 (en) 2005-11-29 2012-09-18 Posco Wire guider of air guide type
KR100742845B1 (en) * 2006-07-24 2007-07-25 주식회사 포스코 Device for connecting wire rod's surface flaws detector and guider of the detector
KR100977738B1 (en) * 2008-03-31 2010-08-24 홍석중 Magnetic saturation measuring instrument for hard metal
CN104807878A (en) * 2015-03-24 2015-07-29 肖勤 Sensor for damage detection of braided steel wire rope
EP3715815A1 (en) 2019-04-08 2020-09-30 Airbus Defence And Space, S.A.U. System and method for monitoring the degradation status of refueling hoses
EP3715815B1 (en) * 2019-04-08 2023-03-29 Airbus Defence and Space, S.A.U. System and method for monitoring the degradation status of refueling hoses

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