WO2013089373A1 - 강판의 결함 탐상 장치 - Google Patents
강판의 결함 탐상 장치 Download PDFInfo
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- WO2013089373A1 WO2013089373A1 PCT/KR2012/010307 KR2012010307W WO2013089373A1 WO 2013089373 A1 WO2013089373 A1 WO 2013089373A1 KR 2012010307 W KR2012010307 W KR 2012010307W WO 2013089373 A1 WO2013089373 A1 WO 2013089373A1
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- Prior art keywords
- flaw detection
- defect
- magnetization
- pole
- steel sheet
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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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- 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
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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
- G01N27/83—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws by investigating stray magnetic fields
- G01N27/87—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws by investigating stray magnetic fields using probes
Definitions
- the present invention relates to an apparatus for flaw detection of defects existing on the inside or the surface of a steel sheet by using leakage magnetic flux.
- Steel sheet defect detection techniques include ultrasonic testing, magnetic flux leakage, magnetic particle inspection, eddy current inspection, and optical methods.
- the leak magnetic flux flaw detection method is a method of detecting a part of magnetic flux leaking to the outside by defects of the steel sheet when magnetizing the steel sheet in a certain direction using a magnetic sensor or a hall sensor.
- the leak magnetic flux inspection method has excellent performance against crack defects occurring under the surface or surface of a ferromagnetic metal, and an example of the flaw detection apparatus by the above-mentioned leak magnetic flux is cited (Korean Patent Publication No. 2010-0076838). ) Is disclosed.
- the magnetizer 120 is disposed on the upper portion of the steel sheet 10 wound on the roll 110. Electromagnet poles 121a and 121b are alternately arranged in the lower region of the magnetizer 120, and the coil 122 is wound in the upper region of the magnetizer 120. At this time, when the current in the opposite direction flows through the coil 122 to the electromagnet poles 121a and 121b, the steel plate 10 is magnetized in the direction of the electromagnet pole 121b of the S pole from the electromagnet pole 121a of the N pole. .
- the leakage magnetic flux is sensed by the sensor 131 formed between the electromagnet poles 121a and 121b to detect the defect of the steel plate 10.
- the above-described electromagnet poles 121a and 121b are spaced apart from each other by a predetermined distance, and are inclined by a predetermined angle ( ⁇ ) with respect to the rolling direction, so that the steel plate 10 is formed in a spiral form to the boundary line A that contacts the roll 110. It is configured to be.
- the magnetizer 120 is an integrated structure in which a plurality of electromagnet poles 121a and 121b are integrated, only some units such as the electromagnet poles 121a and 121b or the sensor 131 are provided. Can't be replaced, making it difficult to maintain
- a defect flaw detector for a steel sheet that can accurately detect defects on the surface or inside of the steel sheet.
- a flaw flaw detector for a steel sheet which can efficiently maintain and manage flaw detectors.
- the defect flaw detection apparatus of the steel plate which can isolate
- the flaw flaw detection apparatus in a flaw flaw detector for flaw detection of a steel sheet, includes a plurality of flaw detection units arranged in the width direction of the steel sheet, and each of the flaw flaw detection units corresponds to a first corresponding one another.
- a magnetization unit including a magnetization pole and a second magnetization pole, and generating magnetic flux for magnetizing the steel sheet in a direction inclined by a predetermined angle with respect to the rolling direction through the first magnetization pole and the second magnetization pole; And a detection unit for detecting a leaked magnetic flux leaked by a defect present in the inside or the surface of the steel sheet by the magnetic flux generated by the magnetization unit.
- the second magnetization pole may be disposed in parallel with a predetermined distance from the first magnetization pole in a direction orthogonal to the direction in which the first magnetization pole is inclined, and the first magnetization pole And the second magnetizing electrode may have the same length.
- the first magnetization pole and the second magnetization pole may be disposed at an angle of 45 degrees with respect to the rolling direction.
- the plurality of flaw detection units may be provided in a modular form so as to be detachable for each unit.
- the magnetization portion includes a permanent magnet and a yoke extending to both sides of the permanent magnet, wherein the first magnetization pole is provided at one end of the yoke, and the second magnetization pole is It may be provided at the other end of the yoke.
- the permanent magnet is a cylindrical permanent magnet
- the cylindrical permanent magnet is provided to be rotatable about the longitudinal direction of the cylinder in the magnetization portion, the size of the magnetic flux induced in the yoke is adjusted It may be possible.
- the plurality of flaw detection units the upper flaw detection units disposed on the upper portion of the steel sheet; And lower flaw detection units disposed below the steel sheet.
- the defect flaw detector is a defect that analyzes the position of the defect in the thickness direction of the steel sheet based on the phase and magnitude of a signal measured in the upper flaw detection units and the lower flaw detection units, respectively.
- the analysis unit may further include.
- the sensor unit may have a distance of 60 ⁇ m or less from a neighboring hall sensor.
- the first magnetization pole and the second magnetization pole may be arranged such that adjacent magnetization poles are the same between adjacent flaw detection units.
- the two magnetizing poles constituting the magnetizing portion have the same length, so that accurate defect detection can be performed.
- the plurality of flaw detection units are provided in a modular form so as to be detachable for each unit, thereby increasing the maintenance and management efficiency of the flaw detection device.
- the present invention by detecting flaw magnetic flux by arranging flaw detection units on both the upper and lower parts of the steel sheet, it is possible to accurately detect the separation of the surface defect and the internal defect or to determine the position of the internal defect.
- FIG. 1 is a view showing the structure of a flaw detector according to the prior art.
- FIG. 2 is a view from above of the flaw detector of FIG. 1, illustrating a problem of the prior art.
- FIG. 2 is a view from above of the flaw detector of FIG. 1, illustrating a problem of the prior art.
- FIG 3 is a configuration diagram of a flaw detector according to one embodiment of the present invention.
- FIG. 4A is a diagram illustrating an internal structure of a flaw detection unit according to an embodiment of the present invention.
- 4B illustrates a plurality of flaw detection units installed on a plane and on a roll top according to one embodiment of the present invention.
- 4C is a diagram illustrating an arrangement direction of magnetization electrodes according to an embodiment of the present invention.
- 5B to 5C are diagrams showing the output signals of the flaw detection units disposed on the upper and lower parts according to the positions of the defects according to the embodiment of the present invention.
- 5D to 5E are diagrams for explaining a method of analyzing a position of a defect from an output signal from a flaw detection unit disposed above and below the steel sheet.
- the flaw detector includes a power supply unit 310 for supplying power to the detector 320b and a plurality of flaw detection units arranged in the width direction of the steel plate 10 (one flaw unit in FIG. 3). (Only 320) and a defect of the steel sheet 10 based on the amplifying unit 330 for amplifying the leaked magnetic flux detected by the flaw detection unit 320 and the leaked magnetic flux amplified by the amplifying unit 330 ( And a defect detector 340 for detecting a defect, hereinafter referred to as 'D'.
- the flaw detection unit 320 may include a magnetization unit 320a for magnetizing the steel plate 10 in a predetermined direction and a detection unit 320b for detecting leakage magnetic flux caused by the defect D of the steel plate 10. .
- 4A is a diagram illustrating an internal structure of one flaw detector unit according to one embodiment of the present invention.
- one flaw detection unit 320 includes a permanent magnet (PM) and a yoke extending to both sides of the permanent magnet (PM), and the first magnetization pole 320c includes the yoke of the yoke. One end is provided, and the second magnetization pole 320d is provided at the other end of the yoke.
- the permanent magnet (PM) is a cylindrical permanent magnet is provided on the magnetization portion 320 to be rotatable in the longitudinal direction of the cylinder, the size of the magnetic flux induced in the yoke can be adjusted. That is, the magnitude of the magnetic flux formed between the first magnetization pole 320c and the second magnetization pole 320d may change as the permanent magnet PM rotates about the longitudinal direction of the cylinder.
- the smallest magnetic flux is the largest when the N pole and the S pole of the permanent magnet PM are arranged in the horizontal direction.
- Magnetic flux may be formed between the first magnetization pole 320c and the second magnetization pole 320d.
- the first magnetization pole 320c and the second magnetization pole 320d are disposed above the steel plate 10 in a direction inclined by a predetermined angle with respect to the rolling direction, which will be described later with reference to FIG. 4B.
- the detector 320b is disposed between the first magnetization pole 320c and the second magnetization pole 320d, and has a cylindrical shape spaced apart from the first magnetization pole 320c and the second magnetization pole 320d by a predetermined distance. It is disposed in the longitudinal direction of the permanent magnet PM.
- the detection unit 320b described above is for detecting leakage magnetic flux due to internal or surface defects of the steel sheet 10, and may include a magnetic sensor or a hall sensor.
- the detector 320b may be a plurality of Hall element arrays, and a distance L between neighboring Hall sensors HS1 and HS2 may be 60 ⁇ m or less. As described above, according to the exemplary embodiment of the present invention, more accurate defect detection is possible by minimizing the distance between neighboring hall sensors HS1 and HS2.
- the flaw detection unit 320 may be provided in a modular form and thus may be attached and detached for each unit.
- the first magnetization pole 320c, the second magnetization pole 320d, the permanent magnet PM, and the detector 320b in the flaw detection unit 320 may also be provided in a modular form and may be attached and detached for each unit.
- Figure 4b is a diagram showing a plurality of flaw detection units installed on the plane and the upper portion according to an embodiment of the present invention
- Figure 4c is a view showing the arrangement direction of the magnetizing poles according to an embodiment of the present invention .
- the defect flaw detector of the steel sheet 10 may include a plurality of flaw detection units (as described in detail in FIG. 4A), Each of the plurality of flaw detection units 320 to 325 may be arranged in the width direction of the steel sheet 10, and may be disposed in a direction inclined by a predetermined angle ⁇ based on the rolling direction of the steel sheet 10. The plurality of flaw detection units 320 to 325 may be spaced apart from the steel plate 10 in a vertical distance by a predetermined distance. Although only six flaw detection units 320 to 325 are shown in FIG. 4B, this is only for convenience of description, and the number thereof may be variously modified as necessary.
- the plurality of flaw detection units 320 to 325 are arranged in the width direction on the upper portion of the steel sheet 10 wound on the roll R surface.
- the steel sheet 10 may be disposed in a direction inclined by a predetermined angle ⁇ based on the rolling direction of the steel sheet 10.
- the first magnetization pole 320c and the second magnetization pole 320d have polarities corresponding to each other, and the second magnetization pole 320d is in a direction in which the first magnetization pole 320c is inclined.
- the first magnetization pole 320c and the second magnetization pole 320d may have the same length in parallel with each other.
- the angle ⁇ in which the first magnetization pole 320c and the second magnetization pole 320d are inclined in the rolling direction may be 45 degrees. It will be apparent to those skilled in the art that the above-described angles are only examples, and may be modified as necessary.
- the two magnetization electrodes 320c and 320d constituting the magnetization part 320 have the same length, and thus, at both ends of the magnetization electrodes 320c and 320d.
- the direction and intensity of the magnetic flux to be formed can be made uniform, so that accurate defect detection can be performed.
- the power is supplied to the detection unit 320b by the power supply unit 310, and the defects may be caused by the flaw detection units 320 to 325 arranged in the width direction of the steel plate 10.
- the leakage magnetic flux according to D) is detected. Specifically, when describing based on one flaw detection unit 320, the magnetic flux is generated by the magnetization unit 320 formed in a direction inclined by a predetermined angle with respect to the rolling direction, the generated magnetic flux passes through the steel sheet 10 . At this time, the detection part 320b detects the leakage magnetic flux by the defect D of the steel plate 10. FIG. The detected leakage magnetic flux is transmitted to the amplifier 330.
- the amplifying unit 330 amplifies the leaked magnetic flux detected by the flaw detection unit 320 at a predetermined ratio and transmits it to the defect detecting unit 340.
- the defect detector 340 may detect the defect D of the steel sheet 10 based on the leakage magnetic flux amplified by the amplifier 330.
- FIG. 5A illustrates a flaw detection unit disposed above and below a steel sheet according to an embodiment of the present invention.
- flaw detection units 320 and 520 are disposed on both upper and lower portions of the steel sheet 10.
- 5B and 5C are diagrams showing the output signals of the flaw detection unit disposed in the upper and lower parts according to the position of the defect according to the embodiment of the present invention.
- the upper flaw detection unit 320 may be disposed above the steel plate 10, and the lower flaw detection unit 520 may be disposed below the corresponding steel plate 10.
- the lower flaw detection unit 520 may be disposed below the steel plate 10.
- one upper flaw detection unit 320 and one lower flaw detection unit 520 are disposed below the steel plate 10, but this is to help understanding of the present invention.
- a plurality of flaw detection units may be arranged at each of the upper and lower portions of 10) as shown in FIG. 4B.
- reference numeral 530 is an enlargement of the defects existing in the thickness direction of the steel sheet 10 in the upper portion of the drawing of Figure 5a, the defect (D) may be present at various locations along the thickness direction 532 of the steel sheet 10. It is shown. For example, as shown at 531, D1 is at the upper surface side of the steel sheet 10, D2 is at the upper inner side of the steel sheet 10, D3 is at the center of the steel sheet 10, and D4 is the steel sheet 10. At the lower inner side of D1), D5 shows a defect D formed at the lower surface side of the steel sheet 10. As shown in FIG.
- FIGS. 5B and 5C The output signals from the upper flaw detection unit 320 and the lower flaw detection unit 520 for each of the above-described defects D1 to D5 are shown in FIGS. 5B and 5C.
- reference numeral 540 denotes an output signal of the upper flaw detection unit 320
- reference numeral 541 denotes an output signal of the lower flaw detection unit 520.
- the output signals from the upper flaw detection unit 320 and the lower flaw detection unit 520 differ in magnitude and phase depending on the positions of the defects D1 to D5. have. That is, in the case of the defect D1 formed on the upper surface side of the steel plate 10, the output signal 540 from the upper flaw detection unit 320 is opposite in phase to the output signal 541 from the lower flaw detection unit 520. It can be seen that the size is larger. Thus, it can be seen from this that the defect D is formed on the upper surface side of the steel sheet 10.
- the output signal 541 from the lower flaw detection unit 520 is reversed in phase compared to the output signal 540 from the upper flaw detection unit 320. It can be seen that the size is larger. Therefore, it can be seen from this that the defect D is formed on the lower surface side of the steel sheet 10.
- the defect (D3) formed in the center of the steel plate 10 the magnitude of the output signal 540 from the upper flaw detection unit 320 and the output signal from the lower flaw detection unit 520 is only the opposite phase, It can be seen that the size is the same. Therefore, it can be seen from this that the defect D is formed in the center portion of the steel sheet 10.
- the position of the defect D can be analyzed by comparing the magnitude and phase of the output signal from the upper flaw detection unit 320 and the lower flaw detection unit 520.
- the defect position DP may be analyzed by obtaining a defect function (DF) with various factors as inputs, which will be described with reference to FIGS. 5D and 5E.
- DF defect function
- 5D is a diagram for explaining factors for obtaining a defect function DF from an output signal 540 from the upper flaw detection unit 320 and an output signal 541 from the lower flaw detection unit 520.
- ⁇ M is the magnitude difference between the two output signals 540, 541, A1 is the area of the output signal 541 from the lower flaw detection unit 520, and A2 is the output signal from the top flaw detection unit 320.
- An area 540 denotes a slope of a straight line connecting the maximum value and the minimum value of the output signal.
- the defect function DF can be obtained according to the following equation 1 based on several factors in addition to the various factors described above.
- DF is the defect function
- ⁇ M is the difference between the two output signals
- A is the area of the output signal
- S is the slope of the straight line connecting the maximum and minimum values of the output signal
- Wf is the type of defect (circle, ellipse, L) is a value for compensating the gap between the detection unit and the steel sheet.
- defect function DF having the aforementioned factors ⁇ M, A, S, Wf, and L as an input may be implemented in various forms, and the present invention is not limited thereto.
- the defect function DF which inputs only DELTA M among the factors (DELTA M, A, S, Wf, L) mentioned above in FIG. 5E is calculated
- the defect detection unit 340 of FIG. 3 has a size difference ⁇ M between the two output signals 540 and 541 according to the position of the defect DP from the surface of the steel sheet 10 to the center (that is, the defect function DF). )),
- the graph as shown in Fig. 5E is obtained beforehand.
- the position DP 1 of the defect means a point 0.6 mm from the upper surface of the steel sheet 10 (that is, the center of the steel sheet)
- the position DP 0.1 of the defect means a point that is the upper surface of the steel sheet 10. do.
- the defect detector 340 of FIG. 3 obtains the magnitude difference ⁇ M from the output signals 540 and 541 obtained from the upper and lower flaw detection units 320 and 520, and obtains the magnitude difference ⁇ .
- M the position DP of the defect can be analyzed.
- the magnitude difference ⁇ M ie, the defect function DF
- ⁇ M the magnitude difference ⁇ M
- the defect D exists at a specific point between the upper surface of the steel plate 10 and the center portion (0.6 mm). Can be analyzed.
Abstract
Description
Claims (11)
- 강판의 결함을 탐상하는 결함 탐상 장치에 있어서,상기 강판의 폭방향으로 배열된 복수 개의 탐상 유닛들을 포함하며,상기 복수 개의 탐상 유닛들 각각은,서로 대응되는 제1 자화극 및 제2 자화극을 포함하며, 상기 제1 자화극 및 상기 제2 자화극을 통해 상기 압연 방향에 대하여 소정 각도 기울어진 방향으로 상기 강판을 자화시키기 위한 자속을 발생시키는 자화부; 및상기 자화부에 의해 발생된 자속에 의해 상기 강판의 내부 또는 표면에 존재하는 결함에 의해 누설되는 누설자속을 검출하는 검출부를 포함하는 결함 탐상 장치.
- 제1항에 있어서,상기 제2 자화극은,상기 제1 자화극이 기울어진 방향과 직교하는 방향으로 상기 제1 자화극으로부터 소정거리 평행 이동되어 배치되는 결함 탐상 장치.
- 제2항에 있어서,상기 제1 자화극과 상기 제2 자화극은,동일한 길이를 가지는 결함 탐상 장치.
- 제1항에 있어서,상기 제1 자화극 및 상기 제2 자화극은,상기 압연방향에 대하여 45도 기울어져 배치되는 결함 탐상 장치.
- 제1항에 있어서,상기 복수 개의 탐상 유닛들은,유닛별로 탈부착 가능하도록 모듈러(modular) 형태로 마련되는 결함 탐상 장치.
- 제1항에 있어서,상기 자화부는,영구자석과, 상기 영구자석의 양측으로 연장되는 요크를 포함하며,상기 제1 자화극은 상기 요크의 일단부에 마련되고, 상기 제2 자화극은 상기 요크의 타단부에 마련되는 결함 탐상 장치.
- 제6항에 있어서,상기 영구자석은 원통형 영구자석인 결함 탐상 장치.
- 제7항에 있어서,상기 원통형 영구자석은,상기 자화부에 원통의 길이방향을 축으로 회전 가능하게 마련되며,상기 요크에 유도되는 자속의 크기는 조정 가능한 것을 특징으로 하는 결함 탐상 장치.
- 제1항에 있어서,상기 복수의 탐상 유닛들은,상기 강판의 상부에 배치되는 상측 탐상 유닛들; 및상기 강판의 하부에 배치되는 하측 탐상 유닛들을 포함하는 결함 탐상 장치.
- 제9항에 있어서,상기 결함 탐상 장치는,상기 상측 탐상 유닛들과 상기 하측 탐상 유닛들에서 각각 측정되는 신호의 위상과 크기에 기초하여 상기 강판의 두께방향으로 결함의 위치를 분석하는 결함 분석부를 더 포함하는 결함 탐상 장치.
- 제1항에 있어서,상기 센서부는,이웃하는 홀 센서와의 간격이 60um이하인 복수의 홀 센서들을 포함하는 결함 탐상 장치.
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
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EP21161512.5A EP3851846A1 (en) | 2011-12-15 | 2012-11-30 | Defect inspection device for steel plate |
EP12857074.4A EP2796869A4 (en) | 2011-12-15 | 2012-11-30 | DEFECTIVE CHECK DEVICE FOR A STEEL PLATE |
CN201280062114.8A CN103998924B (zh) | 2011-12-15 | 2012-11-30 | 钢板的缺陷探伤设备 |
JP2014547086A JP6051229B2 (ja) | 2011-12-15 | 2012-11-30 | 鋼板の欠陥探傷装置 |
US14/365,299 US9417212B2 (en) | 2011-12-15 | 2012-11-30 | Defect inspection device of steel plate |
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KR1020110135319A KR101309966B1 (ko) | 2011-12-15 | 2011-12-15 | 강판의 결함 탐상 장치 |
KR10-2011-0135319 | 2011-12-15 |
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US (1) | US9417212B2 (ko) |
EP (2) | EP3851846A1 (ko) |
JP (1) | JP6051229B2 (ko) |
KR (1) | KR101309966B1 (ko) |
CN (1) | CN103998924B (ko) |
WO (1) | WO2013089373A1 (ko) |
Cited By (1)
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WO2015088089A1 (ko) * | 2013-12-11 | 2015-06-18 | 주식회사 포스코 | 강판의 결함 탐상 장치 및 방법 |
Families Citing this family (6)
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KR101482347B1 (ko) | 2012-12-27 | 2015-01-13 | 주식회사 포스코 | 강판의 내부 결함 검출 장치 및 방법 |
CN105572227B (zh) * | 2016-03-16 | 2018-02-27 | 武汉优凯检测技术有限公司 | 一种探头下置式非接触检测钢板自动探伤装置 |
CN109283243A (zh) * | 2017-07-19 | 2019-01-29 | 迅得机械股份有限公司 | 软板标记系统及方法 |
JP6826739B2 (ja) * | 2017-10-20 | 2021-02-10 | 国立大学法人 岡山大学 | 渦電流探傷法及び渦電流探傷装置 |
CN109781832A (zh) * | 2019-03-19 | 2019-05-21 | 哈尔滨工业大学(深圳) | 一种涂覆钢带损伤检测的方法及励磁装置 |
DE102019004240B4 (de) * | 2019-06-18 | 2024-04-25 | Mike Pfennig | Gerät zur Prüfung von Stahldrahtseilen und Verfahren zu dessen Anwendung |
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- 2012-11-30 WO PCT/KR2012/010307 patent/WO2013089373A1/ko active Application Filing
- 2012-11-30 JP JP2014547086A patent/JP6051229B2/ja active Active
- 2012-11-30 EP EP21161512.5A patent/EP3851846A1/en active Pending
- 2012-11-30 US US14/365,299 patent/US9417212B2/en active Active
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Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2015088089A1 (ko) * | 2013-12-11 | 2015-06-18 | 주식회사 포스코 | 강판의 결함 탐상 장치 및 방법 |
CN105874329A (zh) * | 2013-12-11 | 2016-08-17 | Posco公司 | 检测钢板的缺陷的设备和方法 |
US10088453B2 (en) | 2013-12-11 | 2018-10-02 | Posco | Apparatus and method of detecting defect of steel plate |
CN105874329B (zh) * | 2013-12-11 | 2019-03-01 | Posco公司 | 检测钢板的缺陷的设备和方法 |
Also Published As
Publication number | Publication date |
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EP2796869A1 (en) | 2014-10-29 |
EP2796869A4 (en) | 2015-12-23 |
JP2015500498A (ja) | 2015-01-05 |
US9417212B2 (en) | 2016-08-16 |
JP6051229B2 (ja) | 2016-12-27 |
KR101309966B1 (ko) | 2013-09-17 |
EP3851846A1 (en) | 2021-07-21 |
CN103998924A (zh) | 2014-08-20 |
US20140347041A1 (en) | 2014-11-27 |
KR20130068295A (ko) | 2013-06-26 |
CN103998924B (zh) | 2017-05-24 |
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