KR20170075101A - Apparatus and method for steel sheet inspection - Google Patents

Apparatus and method for steel sheet inspection Download PDF

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Publication number
KR20170075101A
KR20170075101A KR1020150183930A KR20150183930A KR20170075101A KR 20170075101 A KR20170075101 A KR 20170075101A KR 1020150183930 A KR1020150183930 A KR 1020150183930A KR 20150183930 A KR20150183930 A KR 20150183930A KR 20170075101 A KR20170075101 A KR 20170075101A
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KR
South Korea
Prior art keywords
magnetic flux
steel sheet
steel plate
leakage
magnetic
Prior art date
Application number
KR1020150183930A
Other languages
Korean (ko)
Inventor
김현수
Original Assignee
주식회사 포스코
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 주식회사 포스코 filed Critical 주식회사 포스코
Priority to KR1020150183930A priority Critical patent/KR20170075101A/en
Priority to PCT/KR2016/015133 priority patent/WO2017111515A1/en
Publication of KR20170075101A publication Critical patent/KR20170075101A/en

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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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T2207/00—Indexing scheme for image analysis or image enhancement
    • G06T2207/10—Image acquisition modality
    • G06T2207/10048—Infrared image

Abstract

According to one technical aspect of the present invention, there is provided a steel sheet inspection apparatus comprising: a magnetic flux sensor for generating a plurality of magnetic fields in mutually different directions and detecting a plurality of leakage magnetic flux data generated in the steel sheet by the plurality of magnetic fields; And a determination unit for determining a defective area in the steel plate.

Description

[0001] APPARATUS AND METHOD FOR STEEL SHEET INSPECTION [0002]

The present invention relates to a steel sheet inspection apparatus and method.

Various techniques for detecting defects of the steel sheet have been applied as a post-inspection process of the steel sheet. For example, an ultrasonic test method, a magnetic flux leakage method, a magnetic particle inspection method, an eddy current test method, and an optical method are applied to detect a defect in a steel sheet have.

In the case where the thickness of the steel plate is large or the steel plate is covered with a scale other than the surface and the steel plate is under the surface layer, a magnetic flux leakage method is easily applied to detect the defect.

The Magnetic Flux Leakage (Magnetic Flux Leakage) is a technique for detecting defects by measuring a leakage magnetic flux using a magnetic field, but the conventional magnetic flux leakage method is a technique in which a steel plate is stopped for accurate detection, And the like.

In addition, although the magnetic flux leakage method can detect the presence of defects, there is a disadvantage that it is not possible to classify types of defects.

Korean Patent Publication No. 1996-0056084

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is an aspect of the present invention to provide a steel sheet inspection apparatus and method which can easily detect defects even in the progress of steel sheet.

A technical aspect of the present invention provides a steel sheet inspection apparatus. The steel plate inspection apparatus includes a magnetic flux sensor for generating a plurality of magnetic fields in different directions and detecting a plurality of leakage magnetic flux data generated in the steel plate by the plurality of magnetic fields, And may include a determination unit for determining the determination.

Another technical aspect of the present invention provides a steel plate inspection method. The steel plate inspecting method may be performed in a steel plate inspecting apparatus including a plurality of magnetic flux sensors and an image pick-up camera arranged along a traveling direction of a steel plate. The steel plate inspection method includes sequentially activating the plurality of magnetic flux sensors in accordance with progress of the steel plate, determining a defective area in the steel plate from a plurality of leakage magnetic flux data provided by the plurality of magnetic flux sensors, Controlling the imaging camera to capture an image with respect to the defective area, and classifying the type of the defective area using the image data provided by the imaging camera.

The solution of the above-mentioned problems does not list all the features of the present invention. Various means for solving the problems of the present invention can be understood in detail with reference to specific embodiments of the following detailed description.

The steel sheet inspection apparatus and method according to one embodiment of the present invention provide the effect of easily detecting a defect even in the progress of the steel sheet.

A steel sheet inspection apparatus and method according to another embodiment of the present invention provides an effect of distinguishing defects under the surface layer or the surface layer of a steel sheet.

1 is a view showing a steel sheet inspection apparatus according to an embodiment of the present invention.
FIG. 2 is a view showing an embodiment of the magnetic flux sensing unit shown in FIG. 1. FIG.
3 is a plan view showing the progress of defects of the steel sheet and the magnetic flux sensing unit for detecting the progress thereof.
FIG. 4 is a graph showing leakage magnetic flux data detected by the magnetic flux sensing unit shown in FIG. 3. FIG.
5 is a graph showing data obtained by adding leakage magnetic flux data shown in FIG.
6 is a flowchart showing a steel sheet inspection method according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

However, the embodiments of the present invention can be modified into various other forms, and the scope of the present invention is not limited to the embodiments described below. Further, the embodiments of the present invention are provided to more fully explain the present invention to those skilled in the art.

1 is a view showing a steel sheet inspection apparatus according to an embodiment of the present invention.

Referring to FIG. 1, the steel sheet inspection apparatus can detect a defect with respect to the steel sheet 10 being transported.

 The steel sheet inspection apparatus may include a magnetic flux sensing unit 110 and a determination unit 130. In one embodiment, the steel plate inspection apparatus may further include an image acquisition unit 120. [

The magnetic flux sensing unit 110 may generate a plurality of magnetic fields having different directions. The magnetic flux detecting unit 110 can detect a plurality of leakage magnetic flux data induced in the steel sheet by the plurality of magnetic fields.

Since the magnetic flux detecting unit 110 detects leakage magnetic flux data in different directions, even if a defect existing in the steel plate 10 is formed to be long in a specific direction, it can be detected effectively.

The magnetic flux sensing unit 110 may include a plurality of magnetic flux sensors. The magnetic flux sensor can detect leakage magnetic flux data using a magnetic field formed in a specific direction. In the example shown in FIG. 1, the magnetic flux sensing unit 110 includes four magnetic flux sensors in the width direction of the steel plate and four magnetic flux sensors in the longitudinal direction of the steel plate. However, , The number of magnetic flux sensors can be changed according to the embodiment.

The determination unit 130 may determine whether a defect exists in the steel plate 10 in response to the output of the magnetic flux sensing unit 110. [ For example, the determination unit 130 may determine a region (hereinafter, referred to as a 'defective region') where a defect is determined to exist in the steel plate 10 by using a plurality of leakage magnetic flux data provided from the magnetic flux sensing unit 110 Can be determined.

In one embodiment, the steel plate inspection apparatus may further include an image acquisition unit 120. [ The determination unit 130 may determine the defective area using the output of the magnetic flux sensing unit 110 and may control the image obtaining unit 120 to acquire the image data of the defective area. The determination unit 130 may classify the type of the defect using the acquired image data.

The image acquisition unit 120 may include a plurality of image capture devices. The plurality of image pickup devices may be arranged corresponding to the positions of the magnetic flux sensors.

The image acquisition unit 120 may include an imaging device using short-wavelength infrared rays. Here, short wave infra-red (SWIR) may have a wavelength range of 0.9 to 1.7 μm. Unlike mid-infrared and long-wavelength infrared rays, short-wave infrared (SWIR) has similar optical properties to visible light in absorption or reflection of photons on objects. Image analysis is easy. On the other hand, most of visible light is reflected at the surface of objects, whereas short wave infrared (SWIR) is transmitted at a certain depth (for example, several hundreds of um) due to its short wavelength, . Accordingly, the image acquiring unit 120 can imaged defects in the steel sheet that are not visible on the surface by using such Short Wave Infra-Red (SWIR).

FIG. 2 is a view showing an embodiment of the magnetic flux sensing unit shown in FIG. 1. FIG.

2, the magnetic flux sensing unit 110 may include a plurality of electromagnets 111, 113, 115 and 117, a plurality of sensors 112, 114, 116 and 118, and a switch 119.

The plurality of electromagnets 111, 113, 115, and 117 are fixed in different directions, and magnetic fields can be generated in different directions, respectively.

2, the magnetic flux sensing unit 110 includes a first electromagnet 111 fixed in the running direction of the steel plate 10, a second electromagnet 111 fixed in the direction increasing by 40 degrees to 50 degrees with respect to the running direction of the steel plate, The second electromagnet 113 and the third electromagnet 115 fixed in the direction perpendicular to the running direction of the steel plate 10 and the fourth electromagnet 115 fixed in the direction increasing by 40 degrees to 50 degrees with respect to the fixing direction of the third electromagnet 115, And may include an electromagnet 114.

The plurality of electromagnets 111, 113, 115, and 117 may be spaced apart from each other in the traveling direction of the steel plate 10.

The plurality of sensor units 112, 114, 116, and 118 can detect magnetic fields generated by the plurality of electromagnets 111, 113, 115, and 117, respectively. In the illustrated example, the plurality of sensor units 112, 114, 116, and 118 are fixed to the lower surface of the steel plate 10, but may be fixed to the upper surface or one side surface of the steel plate according to the embodiment.

In the illustrated example, one electromagnet and its corresponding sensor may be a magnetic flux sensor. In the illustrated example, the electromagnet and the sensor group are shown as separate devices, but according to the embodiment, the electromagnet and the sensor group can be implemented as an integral device-flux sensor.

The switch 119 can activate at least some of the plurality of electromagnets 111, 113, 115, and 117 under the control of the determination unit 130 (shown in FIG. 1). That is, the switch 119 can be switched to activate the electromagnet when a specific region of the steel sheet reaches a position corresponding to the electromagnet in accordance with the running speed of the steel strip.

In the example shown in FIG. 2, the magnetic flux sensing unit 110 is shown fixed to have four magnetic flux sensors at an angle of about 45 degrees. However, since this is an example, the number of the electromagnets, And various modifications may be made.

For example, the magnetic flux sensing unit 110 may include a first magnetic flux sensor that generates a first magnetic field in a first direction and detects first leakage magnetic flux data generated in the steel plate by the first magnetic field, And a second magnetic flux sensor for generating the second magnetic flux in a second direction different from the first magnetic flux direction and detecting the second leakage magnetic flux data generated in the steel sheet by the second magnetic flux.

3 is a plan view showing the progress of defects of the steel sheet and the magnetic flux sensing unit for detecting the progress thereof.

Referring to FIGS. 2 and 3, the defects 11 present on the steel sheet move along the running direction of the steel sheet. The magnetic flux detecting unit 110 can sequentially detect a plurality of leakage magnetic flux data with respect to one region of the steel sheet in accordance with the progress of the steel sheet. That is, the plurality of electromagnets 111, 113, 115, and 117 can sequentially generate a magnetic field for one region of the steel sheet.

In one embodiment, the magnetic flux sensor 110 controls the first electromagnet 111 to always generate a magnetic field, and the second to fourth electromagnets 113 to 117 control the magnetic flux leaking by the electromagnet In the data, it can be activated when it is judged that a defect exists.

In the illustrated example, since the defects 11 are formed long in the running direction of the steel sheet, the leakage magnetic flux data are formed differently depending on the angle of the electromagnet or the magnetic flux sensor. This will be described further with reference to FIG. 4 below.

FIG. 4 is a graph showing leakage magnetic flux data detected by the magnetic flux sensing unit shown in FIG. 3. FIG.

3 shows the leakage magnetic flux data obtained in the magnetic field generated in the first electromagnet 111 shown in FIG. 3 and the graph (b) shows the leakage magnetic flux data obtained in the second electromagnet 113 and the fourth electromagnet 117 (C) shows the leakage magnetic flux data obtained in the magnetic field generated in the third electromagnet 115 shown in FIG. 3, and FIG. 3 (c) shows leakage magnetic flux data obtained in the magnetic field generated in the third electromagnet 115 shown in FIG.

As shown in FIG. 3, since the defects 11 are formed long in the running direction of the steel sheet, the first electromagnets 111 forming the magnetic field in the running direction of the steel sheet have a relatively small influence. This is because the magnetic field is formed in an elliptical shape that extends from one pole to another pole of the electromagnet.

On the other hand, as shown in the graph (c), the leakage magnetic flux data detected from the third electromagnet 115 forming a magnetic field in the direction perpendicular to the longitudinal direction of the defect 11 shows that the variation amount of the leakage magnetic flux is large have.

Since the steel sheet inspection apparatus according to an embodiment of the present invention includes the magnetic flux sensors in various directions, it is possible to detect any defects existing in the steel sheet in any direction, You can also check.

5 is a graph showing data obtained by adding leakage magnetic flux data shown in FIG.

The determination unit 130 (shown in FIG. 1) can determine a defective area in which a defect of the steel sheet exists by using a plurality of leaky flux data.

For example, the determination unit 130 (shown in FIG. 1) may accumulate the leakage magnetic flux data detected by the magnetic flux sensors of the plurality of directions to determine a defective area.

The graph shown in Fig. 5 can be obtained from the magnetic field formed in each direction as shown in Fig. 3, and by accumulating a plurality of leakage magnetic flux data as shown in Fig.

The determination unit 130 (shown in FIG. 1) may determine that a defect exists in the corresponding area if the sum of the plurality of leakage magnetic flux data exceeds the threshold Ft, and set the corresponding area as a defective area . The determination unit 130 (shown in FIG. 1) may control the image acquisition unit 120 (shown in FIG. 1) so as to capture image data of the defective area in consideration of running of the steel sheet.

Hereinafter, a steel sheet inspection method according to an embodiment will be described with reference to FIG. The control characteristics of the steel sheet inspection apparatus (for example, control characteristics of the determination section) can be well understood from the steel sheet inspection method to be described below.

6 is a flowchart showing a steel sheet inspection method according to an embodiment of the present invention.

Referring to FIG. 6, the steel sheet inspection apparatus may sequentially activate a plurality of magnetic flux sensors in response to the progress of the steel sheet (S610).

As described above with reference to Figs. 1 to 5, the plurality of magnetic flux sensors can generate magnetic fields in mutually different directions, and can detect leakage magnetic flux data in mutually different directions.

Thereafter, the steel sheet inspection apparatus can determine a defective area in the steel sheet from a plurality of leakage magnetic flux data provided by the plurality of magnetic flux sensors (S620).

The steel plate inspection apparatus can control the imaging camera to shoot an image with respect to the defective area (S630).

The steel plate inspection apparatus can classify the type of the defective area using the image data provided by the imaging camera (S640).

For example, the steel plate inspection apparatus can determine the appearance information such as the shape, size, or orientation of the defect from the image data extracted from the defect region. The steel plate inspection apparatus can classify the defects by applying a statistical classification model to the determined contour information.

In one embodiment of the step S610, the steel sheet inspection apparatus can confirm the traveling speed of the steel sheet. Thereafter, the steel strip inspection apparatus may sequentially activate the plurality of magnetic flux sensors in accordance with the traveling speed so that the plurality of magnetic flux sensors sense common to one region of the steel sheet.

In one embodiment of the step S620, the steel sheet inspection apparatus can estimate the direction of the defect using at least one leakage magnetic flux data having a flux intensity of a threshold value or more.

In one embodiment of the step S630, the steel sheet inspection apparatus may sum up a plurality of leakage magnetic flux intensities respectively included in the plurality of leakage magnetic flux data. The steel plate inspection apparatus can determine the area as a defective area when the summed value is equal to or larger than the threshold value.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not intended to limit the invention to the particular forms disclosed. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

110: magnetic flux sensor
111, 113, 115, 117: Electromagnet
112, 114, 116 and 118:
119: Switch
120:
130:

Claims (15)

A magnetic flux sensor for generating a plurality of magnetic fields in different directions and detecting a plurality of leakage magnetic flux data induced in the steel sheet by the plurality of magnetic fields; And
A determination unit for determining a defective area in the steel sheet from the leakage magnetic flux data; And the steel plate inspection apparatus.
The steel sheet inspection apparatus according to claim 1,
An image acquiring unit acquiring image data of the defective area; Further comprising:
The determination unit
And classifying the type of defect in the defective area by using the image data.
The magnetic sensor according to claim 1,
And sequentially detects the plurality of leakage magnetic flux data with respect to one region of the steel sheet in accordance with progress of the steel sheet.
The magnetic sensor according to claim 1,
A plurality of electromagnets fixed in different directions and generating magnetic fields respectively in different directions;
A switch for activating at least a part of the plurality of electromagnets; And
A plurality of sensor units for detecting a plurality of leakage magnetic flux data generated by the plurality of electromagnets, respectively;
And the steel plate inspection apparatus.
5. The apparatus according to claim 4, wherein the plurality of electromagnets
And arranged so as to be spaced apart from each other in a traveling direction of the steel sheet.
6. The apparatus according to claim 5, wherein the plurality of electromagnets
And a magnetic field is sequentially generated with respect to one region of the steel sheet.
The magnetic sensor according to claim 1,
A first magnetic flux sensor for generating a first magnetic field in a first direction and detecting first leakage magnetic flux data induced in the steel sheet by the first magnetic field; And
A second magnetic flux sensor for generating second magnetic flux in a second direction different from the first direction and detecting second leakage magnetic flux data generated in the steel flux by the second magnetic field;
And the steel plate inspection apparatus.
The magnetic sensor according to claim 1,
A first magnetic flux sensor for generating a first magnetic field in a first direction parallel to the running direction of the steel sheet and for detecting first leakage magnetic flux data induced in the steel sheet by the first magnetic field;
A second magnetic flux sensor for generating a second magnetic field in a second direction which is increased by 40 degrees to 50 degrees with respect to the first direction and detecting second leakage magnetic flux data induced in the steel sheet by the second magnetic field;
A third magnetic flux sensor for generating a third magnetic field in a third direction perpendicular to the running direction of the steel sheet and detecting third leakage magnetic flux data induced in the steel sheet by the third magnetic field; And
A fourth magnetic flux sensor for generating a fourth magnetic field in a fourth direction that is increased by 40 degrees to 50 degrees with respect to the third direction and detecting fourth leakage magnetic flux data induced in the steel sheet by the fourth magnetic field;
And the steel plate inspection apparatus.
9. The apparatus of claim 8, wherein the first to fourth magnetic flux sensors
Wherein the steel plate inspection apparatus is arranged in the direction of travel of the steel plate.
The apparatus of claim 2, wherein the image obtaining unit
And acquires image data of the defective area using a short wavelength infrared ray having a wavelength range of 0.9 to 1.7 um.
A steel plate inspection method carried out in a steel plate inspection apparatus including a plurality of magnetic flux sensors and an image pick-up camera arranged along a traveling direction of a steel plate,
Sequentially activating the plurality of magnetic flux sensors in accordance with progress of the steel plate;
Determining a defective area in the steel sheet from a plurality of leakage magnetic flux data provided by the plurality of magnetic flux sensors;
Controlling the imaging camera to capture an image of the defective area; And
Classifying the type of the defective area using the image data provided by the imaging camera;
Of the steel plate.
12. The method of claim 11, wherein sequentially activating the plurality of magnetic flux sensors comprises:
Confirming an advancing speed of the steel sheet; And
Sequentially activating the plurality of magnetic flux sensors in accordance with the traveling speed so that the plurality of magnetic flux sensors sense common to one region of the steel sheet;
Of the steel plate.
The method of claim 11, wherein the step of determining a defective area in the steel sheet
Summing a plurality of leakage magnetic flux intensities included in the plurality of leakage magnetic flux data; And
Determining the area as a defective area if the summed value is greater than or equal to a threshold value;
Of the steel plate.
12. The magnetic sensor according to claim 11, wherein the plurality of magnetic flux sensors
And generating magnetic fields in different directions from each other to detect leakage magnetic flux data in directions different from each other.
15. The method of claim 14, wherein determining the defective area comprises:
Estimating a direction of a defect using at least one leakage magnetic flux data having a flux intensity of a threshold value or more;
Of the steel plate.
KR1020150183930A 2015-12-22 2015-12-22 Apparatus and method for steel sheet inspection KR20170075101A (en)

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KR1020150183930A KR20170075101A (en) 2015-12-22 2015-12-22 Apparatus and method for steel sheet inspection
PCT/KR2016/015133 WO2017111515A1 (en) 2015-12-22 2016-12-22 Apparatus and method for inspecting steel plate

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KR20210141597A (en) * 2019-04-24 2021-11-23 제이에프이 스틸 가부시키가이샤 Leakage Flux Detector

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CN109164165B (en) * 2018-10-09 2022-10-11 河南科技大学 Image fusion-based steel wire rope nondestructive testing method and device

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KR100448619B1 (en) * 1999-10-05 2004-09-13 주식회사 포스코 Apparatus using infrared-illumination for detecting defect on surface of steel sheet
JP3606439B2 (en) * 2000-01-11 2005-01-05 Ｊｆｅスチール株式会社 Magnetic flux leakage inspection method
KR20100028275A (en) * 2008-09-04 2010-03-12 엘지전자 주식회사 Apparatus and method for inspecting electrode lines of falt panel display
JP5544962B2 (en) * 2010-03-19 2014-07-09 Ｊｆｅスチール株式会社 Magnetic flux leakage flaw detection method and magnetic flux leakage inspection device
KR101441750B1 (en) * 2012-10-19 2014-09-17 주식회사 포스코아이씨티 Apparatus for detecting magnetic flex leakage

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20210141597A (en) * 2019-04-24 2021-11-23 제이에프이 스틸 가부시키가이샤 Leakage Flux Detector

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