KR20170076857A - Crack detection apparatus and method of steel sheet - Google Patents

Crack detection apparatus and method of steel sheet Download PDF

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Publication number
KR20170076857A
KR20170076857A KR1020150185840A KR20150185840A KR20170076857A KR 20170076857 A KR20170076857 A KR 20170076857A KR 1020150185840 A KR1020150185840 A KR 1020150185840A KR 20150185840 A KR20150185840 A KR 20150185840A KR 20170076857 A KR20170076857 A KR 20170076857A
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South Korea
Prior art keywords
crack
signal
steel sheet
detecting
sensor
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KR1020150185840A
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Korean (ko)
Inventor
류창우
신용태
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주식회사 포스코
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Priority to KR1020150185840A priority Critical patent/KR20170076857A/en
Publication of KR20170076857A publication Critical patent/KR20170076857A/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
    • 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

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  • Chemical & Material Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Electrochemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)

Abstract

According to one technical aspect of the present invention, there is provided a crack detecting apparatus for a steel plate, comprising: a sensor module for detecting a leakage magnetic flux of a steel strip being conveyed to generate a sensor signal; and a sensor module for generating a crack signal by subtracting a reference signal from the sensor signal, And a crack detection unit for detecting a crack of the steel sheet by using the crack detection unit. The crack detecting unit may update the reference signal by reflecting the detected sensor signal.

Description

Technical Field [0001] The present invention relates to a crack detection apparatus,

The present invention relates to an apparatus and a method for detecting cracks in a steel sheet.

In order to improve the reliability of the steel sheet, a technique for detecting cracks in the steel sheet has been developed.

The conventional crack detection technology forms a magnetic field to magnetize a steel sheet, and when a leakage magnetic flux is detected by a crack of a steel sheet, it is judged whether or not there is a crack based on the magnetic flux.

However, in the case of such conventional techniques, when the magnetic field of the magnetized steel sheet is affected, for example, when cracks are detected at the edge of the steel sheet, when the position of the steel sheet is changed, or when the composition of the steel sheet is changed There is a problem that the leak magnetic flux is generated or the leak magnetic flux is fluctuated even when there is no crack, and the accuracy of crack detection is lowered.

Japanese Laid-Open Patent Publication No. 2012-008816 Japanese Laid-Open Patent Publication No. 2011-196863 Japanese Laid-Open Patent Publication No. 1994-262777

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is an object of the present invention to provide a crack detection apparatus for a steel plate capable of accurately detecting cracks in a steel sheet even in an environment where the position of the steel sheet is changed, And methods.

A technical aspect of the present invention provides a crack detection apparatus for a steel sheet. The crack detecting apparatus of the steel plate includes a sensor module for detecting a leakage magnetic flux of a steel strip being conveyed and generating a sensor signal and a sensor for generating a crack signal by differentiating the reference signal from the sensor signal, And a crack detecting unit for detecting a crack. The crack detecting unit may update the reference signal by reflecting the detected sensor signal.

Another technical aspect of the present invention provides a method of detecting cracks in a steel sheet. The crack detection method of the present invention includes a step of detecting a leakage magnetic flux of a steel sheet being conveyed to generate a sensor signal by detecting a leakage magnetic flux of the steel sheet being conveyed and detecting a crack, Generating a signal by subtracting a reference signal from the sensor signal to generate a crack signal, and detecting a crack of the steel sheet using the waveform of the crack signal.

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 apparatus for crack detection of a steel sheet according to an embodiment of the present invention provides an effect of accurately detecting a crack in a steel sheet even in an environment where the position of the steel sheet is changed or the composition is changed.

1 is a block diagram showing a crack detection apparatus for a steel sheet according to an embodiment of the present invention.
Fig. 2 is a cross-sectional view showing an example of detecting leaked magnetic flux flowing out from a crack of a steel sheet.
FIG. 3 is a perspective view showing an embodiment of the sensor module shown in FIG. 1. FIG.
4 is a cross-sectional view showing a section cut in the direction II 'in Fig. 3.
5 is a side view showing a crack detection apparatus for a steel sheet according to an embodiment of the present invention.
Fig. 6 is a right-upward view of the crack detection apparatus of the steel sheet shown in Fig. 5; Fig.
7 is a view showing a conveying operation of the crack detecting apparatus according to an embodiment of the present invention.
8 is a view showing various kinds of cracks that can be generated at the edge of the steel sheet.
9 is a diagram showing an example of a sensor signal detected by the sensor module according to the progress of the steel plate.
10 is a diagram showing an example of deriving a crack signal from a sensor signal and a reference signal according to an embodiment of the present invention.
11 is a flowchart showing a crack detection method of a steel sheet 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 block diagram showing a crack detection apparatus for a steel sheet according to an embodiment of the present invention.

Referring to FIG. 1, a crack detection apparatus 100 for a steel sheet may include a sensor module 110 and a crack detection unit 150. According to an embodiment, the crack detection apparatus 100 of a steel sheet may further include at least one of a module transfer unit 120, an edge position detection unit 130, and a transfer control unit 140.

The sensor module 110 can detect the leakage magnetic flux of the steel sheet being transferred and generate a sensor signal. The sensor module 110 may comprise a magnetizer and at least one Hall element.

2 is a cross-sectional view showing an example of detecting a leakage magnetic flux flowing out from a crack of a steel sheet, and the sensor module 110 will be described in more detail with reference to FIG.

The sensor module may include a magnetizer (not shown) and a Hall sensor 210.

A magnetizer (not shown) can magnetize the steel sheet as shown in FIG. 2 by forming a magnetic field on the steel sheet.

The magnetic sensor 210 can detect the leakage magnetic fluxes 221 and 231 and generate a sensor signal corresponding to the detected leakage magnetic fluxes 221 and 231. In this specification, the magnetic sensor 210 means various sensors capable of detecting the leakage magnetic flux, and thus can be implemented by various means such as a Hall sensor or a coil.

The leakage magnetic flux means a magnetic component which is leaked by the cracks 220 and 230 of the steel plate. As shown in the figure, when cracks are generated on the surface or inside of the steel sheet, the magnetic flux flowing in the steel sheet is deformed and leaks out as a leakage magnetic flux to the outside of the steel sheet.

Referring again to FIG. 1, the crack detector 150 generates a crack signal by subtracting the reference signal from the sensor signal, and can detect cracks in the steel sheet using the crack signal.

Here, the crack detecting unit 150 can generate the reference signal by reflecting the detected sensor signal. For example, the reference signal can be generated by reflecting the sensor signal obtained from the steel sheet in which no crack exists.

The crack detector 150 may generate a reference signal using an average value of a plurality of sensor signals detected while the initial mode is being driven. Here, the initial mode means that the sensor module 110 generates a sensor signal but does not determine whether a crack has occurred. For example, if a new steel sheet is to be transported, the initial mode may be driven to generate a reference signal during the first predetermined area of the steel sheet.

The crack detecting unit 150 can be set to have cracks generated in the steel sheet when a peak value equal to or larger than a threshold value is generated in the crack signal. The crack detecting unit 150 can generate crack occurrence information, and can generate information on the type and size of the crack and information on the position where the crack is generated according to the embodiment. Information on the types of cracks can be determined by setting a plurality of different threshold values to determine the type and size of the cracks.

The crack detecting section 150 can update the reference signal by reflecting the sensor signal at the point where the crack does not occur. For example, if the crack detector 150 does not generate a peak value equal to or greater than the threshold value in the crack signal, the crack detector 150 can reset the average of the sensor signal and the existing reference signal as a new reference signal. Therefore, when the composition of a part of the steel sheet is changed or the position of the edge of the steel sheet is changed, the reference signal fluctuates in accordance with the change, thereby preventing malfunction of the edge detection.

The crack detecting unit 150 can determine that a crack has occurred when a peak of the crack signal occurs within a predetermined interval or more. For example, the crack detecting unit 150 may increase the number of cracks by one if a peak value equal to or higher than the threshold value is generated in the crack signal, and set that no crack occurs if the number of cracks detected in a predetermined period is equal to or less than the threshold value. Therefore, it is possible to prevent the malfunction of the crack detection caused by the electric or magnetic influence other than the influence or the crack due to the temporary malfunction of the sensor.

The module transfer unit 120 can transfer the sensor module. That is, the module transfer unit 120 can variably change the position of the sensor module. For example, the module transfer unit 120 can transfer the sensor module 110 in a direction perpendicular to the conveying direction of the steel sheet.

The edge position detection unit 130 can detect the edge position of the steel sheet. Since various techniques for detecting the edge of the steel sheet are known, a description of the edge position detection unit 130 will be omitted.

The transfer control unit 140 may receive the information about the edge position from the edge position detection unit 130 and may control the operation of the module transfer unit 120 such that the sensor module 110 is located at a position corresponding to the edge position .

The sensor module 110, the module transfer unit 120, and the edge position detection unit 130 may be implemented as a single unit, for example, an assembly or a single structure. In addition, the transfer control unit 140 and the crack detection unit 150 may be implemented as one or an individual computing component, such as an integrated circuit or dedicated software.

FIG. 3 is a perspective view showing an embodiment of the sensor module shown in FIG. 1, and FIG. 4 is a cross-sectional view showing a section cut in the direction of I-I 'in FIG.

Referring to FIGS. 3 and 4, one embodiment of the sensor module may include a magnetizer 310 and a plurality of magnetic sensors 320.

The magnetizer 310 can form a magnetic field to magnetize the steel sheet.

The plurality of magnetic sensors 320 may be installed in a constant arrangement. For example, they may be arranged in a line as shown in the illustrated example.

For example, the plurality of magnetic sensors 320 may be arranged in a direction perpendicular to the traveling direction of the steel sheet. In this case, at least a part of the plurality of magnetic sensors may be arranged so as to face the upper surface of the steel sheet, at least a part of the edge area of the steel sheet, and the remaining part of the magnetic sensors face the outer area of the steel sheet. Therefore, in this example, even if the edge of the steel sheet is located only inside the magnetic sensor array, it is possible to accurately detect the crack, so that the ease of control and the accuracy of crack detection can be improved.

FIG. 5 is a side view showing a crack detection apparatus of a steel sheet according to an embodiment of the present invention, and FIG. 6 is a right side view of a crack detection apparatus of the steel sheet shown in FIG.

Referring to FIGS. 5 and 6, the crack detecting apparatus 100 for a steel sheet may be installed at a part of a part of the steel sheet 10 conveyed by the conveying roll 20.

The crack detection apparatus 100 may include a sensor module 510 and module transfer units 520 and 530.

The sensor module 510 may include a first sensor module 511 and a second sensor module 512 positioned at both edges of the steel sheet.

The module transfer units 520 and 530 may include a transfer guide 530 and a transfer unit 520. The conveyor 520 may include a first conveyor 521 and a second conveyor 522 for conveying the first sensor module 511 and the second sensor module 512 on the conveyance guide in the lateral direction have.

FIG. 7 is a view showing a conveying operation of the crack detecting apparatus according to an embodiment of the present invention. Referring to FIG. 7, the conveyance of the sensor module to the edge region of the steel sheet will be described below.

In FIG. 7 (a), the module transferring units 520 and 530 can move the first conveyor 521 and the second conveyor 522 to the outside of the conveying guide 530.

7 (b), the first and second conveyors 521 and 522 are gradually moved to the inside of the conveying guide 530 while the edge position detecting unit (not shown) ) Can be used to determine whether there is an edge of the steel sheet at the current position.

7, when the edge position detection unit (not shown) determines that there is an edge steel plate, the module transfer units 520 and 530 are connected to the first conveyor 521 and the second conveyor 522 The operation of the sensor module 510 can be stopped so that the sensor module 510 is positioned in the edge region of the steel plate.

8 is a view showing various kinds of cracks that can be generated at the edge of the steel sheet. 8 (a) is a plan view of the steel plate, and FIG. 8 (b) is a side view of the steel plate.

The first crack 810 is a penetration type large crack, the second crack 820 is a penetration type micro crack, the third crack 830 is a top crack, the fourth crack 840 is an internal crack, And silver cracks are shown. It is obvious that there are various types of cracks.

In the presence of such a crack, a leakage magnetic flux occurs as described above with reference to FIG. 2, and such leakage magnetic flux can be set differently depending on the type and size of the crack.

Therefore, the crack detecting section 150 can have a plurality of threshold values different depending on the kind and size of the crack, and accordingly, the type and size of the crack can be classified.

9 is a diagram showing an example of a sensor signal detected by the sensor module according to the progress of the steel plate. The sensor signal shown in Fig. 9 shows the sensor signal detected in accordance with the progress of the steel sheet in one magnetic sensor located at the edge portion.

The sensor signal shown in Fig. (A) is a sensor signal for a crack-free region. Since the magnetic sensor is located at the edge portion, the predetermined waveform shown in the sensor signal is detected by the magnetic field flowing out of the edge region.

In the area indicated by reference numeral 810 in FIG. 8B, the waveform of the sensor signal is changed, and it can proceed as shown in the identification number 810 of FIG.

The waveform 810 of the sensor signal thus changed is due to a crack. Therefore, by determining the crack from the change of the waveform of the sensor signal, a crack can be accurately detected even at the edge of the steel sheet.

10 is a diagram showing an example of deriving a crack signal from a sensor signal and a reference signal according to an embodiment of the present invention.

The sensor signal shown in Figure (a) is the signal detected in the edge region of the steel plate 10, and the sensor signal shown in Figure (b) is the signal detected in the edgeless region of the steel sheet.

In the example shown in Fig. (A), the sensor signal has a larger waveform than the reference signal. Therefore, when a crack signal is generated by subtracting a reference signal from a sensor signal, a predetermined waveform, that is, a peak value of a predetermined threshold value or more can be detected.

On the other hand, in the example shown in (b), the sensor signal has a waveform similar to the reference signal. Therefore, when a crack signal is generated by differentiating the reference signal from the sensor signal, a flat waveform, that is, a peak value may not be detected in the crack signal.

Further, as already described above, since the reference signal is generated or reset by using the sensor signal generated in the region where cracks do not exist in the steel sheet, the crack signal can be accurately detected.

In the above, various embodiments of the present invention have been described, focusing on an example of detecting a crack with respect to an edge portion of a steel sheet, but this is merely an example. It is obvious that a crack can be detected even in the central region of the steel sheet because the crack detection apparatus of the steel sheet according to the present invention is described on the assumption of an edge region where a large detection error occurs.

Hereinafter, a crack detection method of a steel sheet according to an embodiment of the present invention will be described with reference to FIG. With reference to the above description with reference to Figs. 1 to 10, a method of detecting cracks in a steel sheet to be described below can be easily understood.

11 is a flowchart showing a crack detection method of a steel sheet according to an embodiment of the present invention.

The crack detection method of the illustrated steel sheet can be performed in a crack detection apparatus that detects a leakage flux of a steel sheet being conveyed and detects a crack.

The crack detection apparatus can detect the leakage magnetic flux of the steel sheet being conveyed and generate a current sensor signal (S1120).

In one embodiment, the crack detection apparatus may perform initial mode driving to generate a reference signal by reflecting the sensor signal (S1110). For example, the crack detecting apparatus can detect a plurality of sensor signals while the initial mode is being driven, and generate a reference signal by using the average value of the plurality of sensor signals.

The crack detecting apparatus can generate a crack signal by subtracting the reference signal from the sensor signal (S1110), and can detect the crack of the steel sheet using the waveform of the crack signal (S1140 to S1181).

In the illustrated example, when a peak value equal to or higher than a threshold value is generated in the crack signal (S1140, YES), the crack detection apparatus can increase the number of cracks by one (S1150).

On the other hand, if a peak value equal to or larger than the threshold value is not generated in the crack signal, the crack detection apparatus can reset the reference signal (S1151). For example, the crack detection apparatus can reset the average of the current sensor signal and the existing reference signal as a new reference signal and reset it.

The crack detecting apparatus may set the occurrence of a crack when the number of cracks detected in the predetermined period exceeds the threshold number after repeating the steps S1120 to S1151 for a predetermined period, that is, the reference number of times N (S1160, YES) (S1170).

On the other hand, if the number of cracks detected in the predetermined section is equal to or less than the threshold number, it can be set that no crack occurs (S1171).

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.

100: Crack detection device of steel sheet
110, 510, 511, 512: sensor module
120: Module transfer part
130: Edge position detector
140:
150:
210: magnetic sensor
220, 230: crack
221, 231: Leakage magnetic flux
310: Charger
320: magnetic sensor
520, 521, 522: conveyor
530: Transport guide

Claims (13)

A sensor module for detecting a leakage magnetic flux of the steel sheet being transferred and generating a sensor signal; And
A crack detector for generating a crack signal by subtracting the reference signal from the sensor signal and detecting a crack of the steel sheet using the crack signal; Lt; / RTI >
The crack detector
And the reference signal is generated by reflecting the detected sensor signal.
The apparatus of claim 1, wherein the crack detector
Wherein the reference signal is generated using an average value of a plurality of sensor signals detected while the initial mode is being driven.
The apparatus of claim 1, wherein the crack detector
And a crack is generated in the steel plate when a peak value equal to or higher than a threshold value is generated in the crack signal.
The apparatus of claim 1, wherein the crack detector
And resetting the average of the sensor signal and the reference signal as the reference signal if a peak value of a threshold value or more is not generated in the crack signal.
The apparatus of claim 1, wherein the crack detector
A crack number is increased by 1 when a peak value equal to or higher than a threshold value is generated in the crack signal and no crack is generated when the number of cracks detected in a predetermined section is equal to or less than a critical number.
The sensor module according to claim 1, wherein the sensor module
And a plurality of magnetic sensors arranged in a direction perpendicular to the conveyance direction of the steel sheet, and generating a plurality of the sensor signals using the plurality of magnetic sensors.
The crack detection apparatus according to claim 1,
A module transferring unit for transferring the sensor module in a direction perpendicular to the conveying direction of the steel sheet;
Further comprising a crack detection unit for detecting cracks on the steel plate.
8. The crack detector of claim 7,
An edge position detecting unit for detecting an edge position of the steel sheet; And
A transfer control unit for controlling the operation of the module transfer unit such that the sensor module is located at a position corresponding to the edge position;
Further comprising a crack detection unit for detecting cracks on the steel plate.
A crack detection method of a steel plate for detecting a crack by detecting a leakage magnetic flux of a steel plate being conveyed,
Generating a sensor signal by detecting a leakage magnetic flux of the steel sheet being conveyed;
Generating a reference signal by reflecting the sensor signal;
Generating a crack signal by subtracting a reference signal from the sensor signal; And
Detecting a crack of the steel sheet using a waveform of the crack signal;
And cracks in the steel sheet.
10. The method of claim 9, wherein generating the reference signal comprises:
Detecting a plurality of sensor signals while the initial mode is being driven; And
Generating the reference signal using an average value of the plurality of sensor signals;
And cracks in the steel sheet.
The method of claim 9, wherein the step of detecting cracks in the steel sheet
Setting a crack to be generated in the steel plate when a peak value equal to or higher than a threshold value is generated in the crack signal;
And cracks in the steel sheet.
The method of claim 9, wherein the step of detecting cracks in the steel sheet
Increasing a number of cracks by 1 when a peak value of a threshold value or more is generated in the crack signal; And
Setting a number of cracks detected in a predetermined section to be less than a threshold value so that a crack does not occur;
And cracks in the steel sheet.
The method of claim 11, wherein the crack detection method
Resetting the average of the sensor signal and the reference signal as the reference signal if a peak value of a threshold value or more is not generated in the crack signal;
And cracks in the steel sheet.
KR1020150185840A 2015-12-24 2015-12-24 Crack detection apparatus and method of steel sheet KR20170076857A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20200035760A (en) * 2018-09-27 2020-04-06 주식회사 포스코 Apparatus and method for estimating side trimming of steel plate
KR20210105167A (en) * 2020-02-18 2021-08-26 김주원 Chanin diagnostic apparatus and method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20200035760A (en) * 2018-09-27 2020-04-06 주식회사 포스코 Apparatus and method for estimating side trimming of steel plate
KR20210105167A (en) * 2020-02-18 2021-08-26 김주원 Chanin diagnostic apparatus and method

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