WO2002033398A1 - Leakage magnetism detecting sensor of magnetic penetration apparatus - Google Patents

Leakage magnetism detecting sensor of magnetic penetration apparatus Download PDF

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Publication number
WO2002033398A1
WO2002033398A1 PCT/JP2001/009159 JP0109159W WO0233398A1 WO 2002033398 A1 WO2002033398 A1 WO 2002033398A1 JP 0109159 W JP0109159 W JP 0109159W WO 0233398 A1 WO0233398 A1 WO 0233398A1
Authority
WO
WIPO (PCT)
Prior art keywords
magnetic
sensor
leakage
sensing surface
strip
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2001/009159
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
Hiroyuki Yokota
Yasuo Tomura
Hideaki Unzaki
Shigetoshi Tsuruoka
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JFE Steel Corp
System Hitec Ltd
Original Assignee
System Hitec Ltd
Kawasaki Steel Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by System Hitec Ltd, Kawasaki Steel Corp filed Critical System Hitec Ltd
Priority to KR1020027007763A priority Critical patent/KR100671630B1/ko
Priority to US10/168,095 priority patent/US6774627B2/en
Priority to CA002396205A priority patent/CA2396205C/en
Priority to EP01976745A priority patent/EP1327882B1/en
Publication of WO2002033398A1 publication Critical patent/WO2002033398A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • 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

Definitions

  • the present invention relates to a sensor for detecting magnetic leakage of a magnetic flaw detector
  • the present invention relates to a magnetic detection sensor.
  • the magnetic flux leakage inspection method generates a magnetic field in the running direction of a material to be inspected, and detects a magnetic flux generated from inside and surface defects of the material to be inspected to detect a defect, and detects a magnetic flux.
  • Sensors include semiconductor magnetic sensors such as magnetic diodes, magnetoresistive elements, and Hall elements, and coil-type sensors include planar coils and induction coil sensors in which a ferrite is wound around a conductor.
  • magnetic diodes have the advantage of high detection sensitivity and small shape, but have the problems of poor temperature characteristics, large basic noise, and low mechanical strength. Although it has a simple structure and good temperature characteristics, it has the problem of low sensitivity.
  • the Hall element which had a low sensitivity in the past, is a semiconductor magnetic sensor with improved sensitivity and temperature characteristics, and is now widely used as a leakage magnetic detection sensor for the magnetic flux leakage detection method.
  • tinplate which is used as a material for food cans and the like, undergoes strong processing in the process of manufacturing two-piece cans (DI cans), metal inclusions (hereinafter simply referred to as inclusions) that are interposed inside the material are also included. However, this is the cause of processing cracks.
  • the size required to detect, at 0. Of 5 X 1 0- 3 hide 3 volume with ellipse calculation is 1. O mm X width 0. I mm X thickness 0. About 0 l mm long, In online flaw detection in the full width direction, the required number of semiconductor magnetic sensors is about 100, and the signal processing circuit is as large as 100,000 channels. There was a problem that a large quantity was required.
  • a ferromagnetic material is disposed directly on the opposite side of the magnetic sensing surface of the coil sensor having the coil formed on the magnetic sensing surface.
  • a ferromagnetic jig is arranged near the magnetic sensor, but this jig avoids saturation of the magnetic sensor.
  • the present invention has been made to solve the above-mentioned conventional problems, and has an object to increase the detection range per leaked magnetic detection sensor and reduce the number of sensors and the number of signal processing circuits. I do.
  • the present invention is directed to a flaw detection head having a group of magnetically sensitive elements provided in parallel in the width direction of a test strip, by generating a magnetic field in the running direction of the test strip and reducing leakage magnetic flux generated by internal and surface defects.
  • a soft magnetic material larger than the magnetic sensing surface is arranged on the opposite side of the magnetic sensing surface of the magnetic sensing element group.
  • the magnetic element constituting the magnetic element group is disposed separately from the soft magnetic body, and is further adhered to the surface of the magnetic element opposite to the magnetic sensing surface to form a separate soft magnetic element. It is a rooster with a magnetic body.
  • Another soft magnetic material is disposed in close contact with the magnetic sensing surface of the magnetic sensing element.
  • the magnetic element is a Hall element.
  • the present invention also provides a method of detecting a leakage magnetic flux generated inside and on a surface defect of a test strip.
  • a large number of magnetic sensitive elements are provided along the width of the strip to be inspected, and a soft magnetic material larger than the magnetic sensitive face is arranged on the opposite side of the magnetic sensitive face of the magnetic sensitive element group.
  • the present invention provides an online flaw detection method for a strip using a leaked magnetic detection sensor.
  • the leakage magnetic detection sensor for example, a semiconductor magnetic sensor
  • the leakage magnetic detection sensor has a magnetically sensitive element (for example, a hole) of a semiconductor magnetic sensor 12 having an extremely large magnetic permeability as compared with the magnetic permeability in space.
  • the soft magnetic material 14 larger than the magnetic sensing surface 12 A of the element is placed on the opposite side of the magnetic sensing surface 12 A, that is, on the opposite side of the surface where the magnetic sensing element faces the strip to be inspected. It is installed at a predetermined distance from the magnetic sensing surface 12 A, that is, separated from the magnetic sensing element.
  • the leakage magnetic flux F ′ generated by the inclusions 1 OA of the strip 10 such as a strip of steel is attracted to the soft magnetic material 14, and the detection width per sensor is widened, and the magnetic sensing surface 12 A Is intensively crossed in a direction perpendicular to both the magnetic sensing surface 12A and the strip 10 so that high sensitivity can be detected.
  • a magnetic element 12 C such as a Hall element is arranged on the surface of a soft magnetic body 12 B such as a ferrite,
  • the soft magnetic body 12B is placed in close contact with the surface of the element 12C opposite to the magnetic sensing surface, and the magnetic sensitive element 12C is inspected from the side of the strip 10 to be inspected.
  • the semiconductor magnetic sensor 12 By arranging the semiconductor magnetic sensor 12 on the surface facing the strip 10 and the soft magnetic material 14 in this order, as shown in FIG. 3, the leakage magnetic flux F is transmitted to the magnetic sensing surface 12A by Since it is possible to traverse intensively in the vertical direction, it is more preferable because the detection width per sensor can be further widened and high-sensitivity detection can be achieved.
  • reference numeral 16 denotes a support plate for mounting the sensor.
  • a magnetic sensor 12C such as a Hall element is placed on the surface of a soft magnetic material 12B such as ferrite, as shown in Fig. 2.
  • the leakage magnetic flux F attracted by the soft magnetic material 14 is further increased on the magnetic sensing surface 12 A by the soft magnetic material 12 B used in the semiconductor magnetic sensor 12. Attracted, more perpendicular to the magnetically sensitive surface 1 2 A This is because the magnetic sensing surface 12 A can be made to cross the magnetic sensing surface in a vertical direction.
  • a magnetic sensor 12C such as a Hall element is placed on the surface of a soft magnetic body 12B such as ferrite as shown in Fig. 4 and a magnetic sensor 12A such as a Hall element is used as a semiconductor sensor.
  • a soft magnetic body 12D such as ferrite may be disposed in close contact with the surface 12A, and the magnetic sensitive element 12C such as a Hall element may be sandwiched between the soft magnetic bodies 12B and 12D such as ferrite.
  • the magnetic sensing surface can be protected, and the leakage magnetic flux F can cross the magnetic sensing surface 12A in the vertical direction to further improve the sensitivity.
  • the magnetic element 12C It is preferable to use a Hall element as the magnetic element 12C. Since the Hall element has little noise, it is easy to detect even small inclusions as in the present application, and the small Hall element itself can be very thin. In particular, it can be made compact in the direction facing the strip. Compared to other magnetically sensitive elements, the magnetic sensing surface can be placed closer to the strip for easier measurement and better detection accuracy.
  • the leakage magnetic flux distribution of the sensor alone as in the conventional case is as shown in FIG. 5, and the leakage magnetic flux F passes through the magnetic sensing surface 12A of the sensor 12 at a shallow angle. Therefore, the perpendicular magnetic flux component to the magnetic sensing surface 12 A was small, and the detection width per sensor was narrow.
  • FIG. 1 is a sectional view for explaining the principle of the present invention.
  • FIG. 2 is a cross-sectional view showing a configuration of a semiconductor magnetic sensor part in an improved example of the present invention.
  • FIG. 3 is a cross-sectional view for explaining the principle of the improved example.
  • FIG. 4 is a sectional view showing a configuration of a semiconductor magnetic sensor portion according to another improved example of the present invention.
  • Fig. 5 is a cross-sectional view for explaining the conventional principle.
  • FIG. 6 is a sectional view showing the overall arrangement of the embodiment of the present invention.
  • Figure 7 is also a plan view '' Fig. 8 is a sectional view showing the configuration of the semiconductor magnetic sensor part.
  • FIG. 9 is a diagram showing an example of test results performed to confirm the effect of the present invention.
  • FIG. 6 is a schematic configuration diagram showing the overall arrangement of the present embodiment
  • FIG. 7 is a plan view of the same
  • FIG. 8 is a semiconductor magnetic sensor (here, a Hall element) constituting the leakage magnetic detection sensor according to the present invention.
  • FIG. 4 is a cross-sectional view showing the shape of a soft magnetic material.
  • the strip 10 is disposed in the vicinity of a non-magnetic port 11 that transports the strip 10 in the direction of the arrow.
  • the strip 10 When a DC current is applied to the magnetized coil 22, the strip 10 is magnetized by the magnetized yoke 24. If the strip 10 has inclusions or surface flaws, a leakage magnetic flux is generated. This leakage magnetic flux is attracted to the soft magnetic body 14 larger than the magnetic sensing surface 12 A at the position of the semiconductor magnetic sensor 12, and intensively crosses the magnetic sensing surface 12 A of the semiconductor magnetic sensor 12. As a result, the detection width of each sensor is widened and detected.
  • FIG. 7 is a schematic diagram showing the shape of the semiconductor magnetic sensor 12 and the soft magnetic body 14 attached to the opposite side of the magnetic sensing surface 12A.
  • the leakage magnetism detection sensor according to the present invention comprises the semiconductor magnetic sensor 12 and a soft magnetic body 14 buried in a support plate 16 for mounting the semiconductor magnetic sensor 12 and having a width W larger than the magnetic sensing surface 12A. Have been.
  • the magnetic sensor since the magnetic sensor has an integral structure, a horizontal magnetic field is generated between the poles of the yoke 24 even when the test strip is at rest, resulting in a floating magnetic field, which adversely affects the magnetic material.
  • the desired shape and the mounting position of the soft magnetic material 14 using a soft magnetic material having a magnetization property and a magnetic flux density differ depending on the size of the flaw of the object to be measured.
  • L 0 mm, thickness T about 0.05 to 3 mm, mounting position D from the side opposite to magnetic sensing surface 12 A of semiconductor magnetic sensor 12 is 0.1
  • the length in the width direction can be up to both end surfaces in the width direction of the sensor to be used.
  • the soft magnetic living body 14 needs to be larger than the magnetic sensing surface 12 A, and is preferably 5 to 30 times longer in both the major axis direction and the minor axis direction of the magnetic sensing surface.
  • the soft magnetic body 14 is preferably arranged at the center of the width in the projection of the magnetic sensing surface 12A onto the soft magnetic body 14.
  • the configuration is simple because the soft magnetic material 14 is embedded in the support plate 16 for mounting the sensor.
  • the arrangement position of the soft magnetic material is not limited to this.
  • the soft magnetic material 14 is not particularly limited, but in addition to ferrite or the like, an inexpensive material such as a cold-rolled steel plate (annealed material) may be used.
  • the semiconductor magnetic sensor 12 and the soft magnetic body 14 are integrated with the magnetic sensor head 20 together with the magnetized coil 22 and the magnetized yoke 24, so that The configuration is simple. It is also possible to separate the magnetized coil 22 and the magnetized yoke 24 from the semiconductor magnetic sensor 12 and the soft magnetic body 14.
  • a Hall element was used as the magnetic sensitive element, and a semiconductor magnetic sensor in which the Hall element was arranged on the surface of a ferrite was used.
  • the soft magnetic material 14 a cold-rolled steel sheet that is larger than the magnetically sensitive surface of the magnetically sensitive element and has a length that is 10 times longer than the magnetically sensitive surface in both the major axis direction and the minor axis direction is used.
  • the object to be measured was a continuous material, a tin plate with a thickness of 0.23 mm, and inclusions with a length of 1.0 mm, a width of 0.1 mm, and a thickness of about 0.01 mm. .
  • the rotation speed of the Lonore was 20 O mpm, and the lift-off between the magnetic sensor and the object was 1.0 O mm.
  • the maximum output of 1 to 2 (half value) force varies depending on the presence or absence of the soft magnetic material 14, and the soft magnetic material 14 (7.8) is about 20% of the case without It was confirmed that it was wide. Therefore, the number of sensors and signal processing circuits can be reduced by about 20%.
  • the presence / absence of the soft magnetic material 14 was examined to determine the variation of the sensor output due to the variation of the magnetizing current, that is, the current value flowing through the magnetizing coil.
  • the sensor output increases in proportion to an increase in the magnetizing current, and when the magnetizing current value exceeds a certain level, the sensor output tends to be saturated.
  • the sensor output is saturated at a relatively low magnetic current as compared with a case where a Hall element is used alone. Increasing the magnetizing current tended to decrease the sensor output.
  • the sensor output does not saturate up to a large magnetizing current as compared with the case where the soft magnetic material 14 is not provided. It was found that the sensor output also increased. The fact that the sensor output does not saturate up to such a large magnetizing current enables a large magnetizing current to flow at the time of measurement, that is, it has been confirmed that measurement can be performed up to an inspection object having a large plate thickness. In addition, the sensor output itself has also increased, confirming that measurement accuracy has been improved.
  • the present invention has been applied to on-line flaw detection of a thin steel sheet, but the present invention is not limited to this.
  • the type of the leakage magnetic detection sensor is preferably a semiconductor magnetic sensor using a Hall element, but is not limited to this.
  • the detection width of each of the leakage magnetic detection sensors can be increased, so that the number of sensors and signal processing circuits can be reduced. Also, the sensitivity of the sensor increases Therefore, it is possible to detect minute inclusions by increasing the lift-off to, for example, 1 mm.

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  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Biochemistry (AREA)
  • Electrochemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
  • Measuring Magnetic Variables (AREA)
  • Hall/Mr Elements (AREA)
PCT/JP2001/009159 2000-10-18 2001-10-18 Leakage magnetism detecting sensor of magnetic penetration apparatus Ceased WO2002033398A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
KR1020027007763A KR100671630B1 (ko) 2000-10-18 2001-10-18 자기 탐상 장치의 누설 자기 검출 센서 및 스트립의온라인 탐상 방법
US10/168,095 US6774627B2 (en) 2000-10-18 2001-10-18 Leak magnetism detection sensor for magnetic flaw detection system
CA002396205A CA2396205C (en) 2000-10-18 2001-10-18 Leakage magnetism detecting sensor of magnetic penetration apparatus
EP01976745A EP1327882B1 (en) 2000-10-18 2001-10-18 Leakage magnetism detecting sensor of magnetic penetration apparatus

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2000317711 2000-10-18
JP2000-317711 2000-10-18
JP2001-299768 2001-09-28
JP2001299768A JP3811039B2 (ja) 2000-10-18 2001-09-28 磁気探傷装置の漏洩磁気検出センサ

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Publication Number Publication Date
WO2002033398A1 true WO2002033398A1 (en) 2002-04-25

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PCT/JP2001/009159 Ceased WO2002033398A1 (en) 2000-10-18 2001-10-18 Leakage magnetism detecting sensor of magnetic penetration apparatus

Country Status (7)

Country Link
US (1) US6774627B2 (enExample)
EP (1) EP1327882B1 (enExample)
JP (1) JP3811039B2 (enExample)
KR (1) KR100671630B1 (enExample)
CN (1) CN1225655C (enExample)
CA (1) CA2396205C (enExample)
WO (1) WO2002033398A1 (enExample)

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JP4825525B2 (ja) * 2006-02-01 2011-11-30 株式会社日立ビルシステム ワイヤロープの探傷装置
CN100427947C (zh) * 2006-06-16 2008-10-22 清华大学 大面积钢板缺陷漏磁检测方法
JP4295774B2 (ja) * 2006-07-20 2009-07-15 株式会社日立ビルシステム ワイヤーロープの探傷装置
US9170234B2 (en) * 2006-11-01 2015-10-27 Industry-Academic Cooperation Foundation, Chosun University Magnetic sensor array and apparatus for detecting defect using the magnetic sensor array
CN101595383B (zh) * 2007-01-31 2012-10-24 三菱电机株式会社 钢丝绳探伤装置
JP5186837B2 (ja) * 2007-08-23 2013-04-24 Ｊｆｅスチール株式会社 微小凹凸表面欠陥の検出方法及び装置
CN100588965C (zh) * 2007-09-25 2010-02-10 王祥国 铁道微磁探伤仪及其探伤方法
JP2010014701A (ja) * 2008-06-04 2010-01-21 Toshiba Corp アレイ型磁気センサ基板
JP5791279B2 (ja) * 2011-01-06 2015-10-07 三菱重工業株式会社 付着物計測装置及び付着物計測方法並びに付着物計測プログラム
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CN104502442B (zh) * 2014-08-28 2017-06-23 西红柿科技（武汉）有限公司 一种具有磁罩的漏磁检测仪
CN104777216B (zh) * 2015-04-29 2017-06-27 华中科技大学 一种适用于点型缺陷的磁轭式局部微磁化检测装置
CN105699481B (zh) * 2016-03-18 2019-03-26 中国计量学院 一种承压设备近表面微小裂纹检测装置
DE102016124522A1 (de) * 2016-12-15 2018-06-21 Thyssenkrupp Ag Verfahren zur Inspektion eines Stahlbands
JP2018189388A (ja) * 2017-04-28 2018-11-29 Tdk株式会社 磁界センサ
JP6978913B2 (ja) 2017-12-01 2021-12-08 住友化学株式会社 欠陥測定装置、欠陥測定方法および検査プローブ
EP3961203B1 (en) * 2019-04-24 2022-11-30 JFE Steel Corporation Leakage magnetic flux flaw inspection device
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CN114829921B (zh) 2019-12-20 2025-08-15 杰富意钢铁株式会社 漏磁检查装置及缺陷检查方法
JP7637574B2 (ja) * 2021-06-15 2025-02-28 株式会社日立ビルシステム ワイヤーロープ探傷装置

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See also references of EP1327882A4

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103197264A (zh) * 2013-03-25 2013-07-10 中国石油天然气股份有限公司 漏磁检测传感器的聚磁装置及漏磁检测装置

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Publication number Publication date
CN1394279A (zh) 2003-01-29
CA2396205C (en) 2005-06-28
CA2396205A1 (en) 2002-04-25
EP1327882A1 (en) 2003-07-16
US6774627B2 (en) 2004-08-10
US20030038629A1 (en) 2003-02-27
CN1225655C (zh) 2005-11-02
JP3811039B2 (ja) 2006-08-16
EP1327882A4 (en) 2005-04-13
KR100671630B1 (ko) 2007-01-18
EP1327882B1 (en) 2013-03-13
KR20020077359A (ko) 2002-10-11
JP2002195984A (ja) 2002-07-10

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