JP2002090307A - Surface defect inspection device and inspected result display method for surface defect inspection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the movement of visual point when a visual inspector refers to the inspection information of a surface defect inspection device. SOLUTION: This surface defect inspection device is provided with a moving signal generator 105 for detecting the moving quantity of a continuously conveyed band body to be inspected; a surface inspection part image processing part 201 for inspecting a defect existing on the surface of the inspected body and detecting the position of the defect detected on the basis of a signal from the moving signal generator 105; a monitor 121 for displaying to the effect that there is the defect, in the vicinity of or on the surface of the inspected object; a screen projector 122; and a result output part 207 for commanding the display output of the presence of the defect to the display part on the basis of the position information of the defect detected by the image processing part 201 and moving quantity information from the moving quantity sensor.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface defect inspection apparatus for inspecting the surface of a continuously transported belt-like inspection object such as a steel plate or aluminum.

[0002]

2. Description of the Related Art A surface defect device is installed in a line for producing a strip such as a steel plate or aluminum to detect a defect on the surface of a test object.

[0003] As a surface inspection apparatus for a band-shaped inspection object,
The surface of the object is scanned while a point light source such as a laser beam is moved in a direction perpendicular to the transport direction of the object (hereinafter, referred to as the width direction) by a rotating polygon mirror or the like, and the reflected light is used as a lens. There is known an apparatus that receives light by a photoelectric element such as a photomultiplier tube after condensing light by using a photomultiplier tube and determines the type and degree of a flaw by performing various kinds of signal processing on the obtained signal.

In such a surface defect inspection apparatus, a movement signal generator is attached for measuring the amount of movement of the object to be inspected, and this signal is taken in by the surface defect inspection apparatus so that the inspection of the surface defect inspection apparatus is performed. The results are tracked along with the movement of the object to be inspected, and the inspection results are displayed on a monitor device such as a CRT installed at a visual inspection site, or the inspection results are grouped and displayed on a display panel (not shown). It was common to display using a lamp or the like.

[0005]

When the inspection result is displayed by the above-described method, the gaze of the inspector is visually checked by the inspector and when the monitor of the inspection device is monitored. Will be different. Therefore, when the visual inspection of the inspection object is performed, the monitor device cannot be seen. Conversely, when the inspection result of the surface defect inspection device is checked by the monitoring device, the visual inspection of the inspection object cannot be sufficiently performed.

As one means for solving such a problem, Japanese Patent Laid-Open Publication No. 5-142164 proposes a defect position display device in which a slit light image surrounds a grid. However, in this technology, when the position of the flaw is displayed but there is no specific detection information, for example, when an action such as automatic marking is performed on a predetermined defect,
It is necessary to refer to information such as whether or not the flaw is detected as an object of automatic marking, and eventually it is necessary to refer to the monitor displaying the inspection result in the same manner as described above.

An object of the present invention is to provide a display method of a surface defect inspection apparatus and a surface defect inspection apparatus which can reduce the movement of a viewpoint when a visual inspector refers to inspection information of the surface defect inspection apparatus. .

[0008]

Means for Solving the Problems [Configuration] The present invention is configured as follows to achieve the above object.

(1) The inspection result display method of the surface defect inspection apparatus according to the present invention (claim 1) provides an inspection result of the surface defect inspection apparatus that displays the inspection result of the surface of the belt-like inspected object that is continuously conveyed. In the display method, when the detected defect passes through a step of detecting a defect on the surface of the object to be inspected, and a vicinity of a display unit that indicates that there is a defect near or near the object to be inspected, Displaying a defect on the display unit.

According to the present invention, when the surface defect inspection apparatus detects a singular point such as a defect, and displays the inspection result on the inspection object, the inspection result is displayed at a width position where the singular point exists. Preferably not.

(2) A surface defect inspection apparatus according to the present invention (claim 2) includes a movement amount sensor for detecting a movement amount of a belt-like inspected object that is continuously conveyed, And a surface inspection unit for detecting the position of the defect detected based on the movement amount information from the movement amount sensor, and displaying that there is a defect near or on the surface of the inspection object. A display unit, based on position information of the defect detected by the surface inspection unit, and movement amount information from the movement amount sensor, a result output for instructing the display unit to output a display indicating that the defect is present; Unit.

[Operation] The present invention has the following operation and effects by the above configuration.

When a detected defect passes near the inspection object or near a display unit for displaying that there is a defect on the surface, the display unit displays an indication that the defect is present. Thereby, the movement of the viewpoint can be reduced, and it is possible to prevent a flaw from being overlooked when performing a visual inspection.

[0014]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram showing a schematic configuration of a continuous production line for producing a thin plate such as a steel plate according to an embodiment of the present invention. As shown in FIG. 1, each coil (test object) 100 sent from the upper process is continuously paid out by a payout machine (not shown). The coil 100 is joined by a joining machine (not shown) such as a welding machine in order to continuously pass through the line. Thereafter, after passing through various processing units 103 for obtaining products having predetermined properties by washing, annealing, various surface treatments, rolling treatments, or the like, the surface is inspected by a surface defect inspection device 110. After the inspection, the sheet is cut into predetermined lengths or weights by a cutting machine 108 and wound into a coil by a winding machine 109.

The surface defect inspection apparatus 110 is usually installed near the last step of the line for inspecting an abnormality occurring in the line. In the surface defect inspection apparatus, a movement signal generator 105 is attached to measure a movement amount of the coil 100. The arithmetic unit 111 images the surface of the coil 100 with the front image input unit 112a and the back image input unit 112b in synchronization with the signal from the movement signal generator 105, and processes the obtained image data with the arithmetic unit 111. Perform an inspection. Then, the calculator 111 outputs a monitor output signal in accordance with the movement signal of the inspection result. The monitor output signal is input to the monitor 121 or the screen projector 122 installed in the visual inspection place 120. The monitor 121
Is composed of a CRT or the like. Further, the screen projector 122 captures the monitor display signal and projects it on a screen or the like installed in the visual inspection place 120. Note that the screen projector 122
Can be displayed on the inspection object or at a place adjacent to the inspection object.

Next, the configuration and operation of the surface defect inspection apparatus will be described with reference to FIG. FIG. 2 is a configuration diagram showing a schematic configuration of a surface defect inspection apparatus according to one embodiment of the present invention.

Image input unit 112 (112a, 112b)
The surface image (analog signal) of the object to be inspected obtained in is output to the image processing unit 201 that selects a flaw candidate from the surface image. The image input unit 112 includes image capturing means such as a CCD camera and a photomultiplier (photomultiplier tube), and a lens for guiding light from the surface of the test object to these image capturing means.
It is composed of a mirror and a filter for performing optical correction. The image processing unit 201 includes an input unit such as an A / D converter that converts an analog signal into a digital signal,
Various correction processes such as shading correction to remove the influence of formation on the input signal, pre-processing parts such as a spatial filter, n-value classification into two or more values from the obtained image, and a predetermined threshold Flaw candidates are extracted. When an inspection is performed including the edge portion of the object to be inspected, since the edge portion is usually an uneven surface, it is necessary to mask the edge portion or change the processing. For this reason, it is necessary to detect the edge position of the object to be inspected. This edge position detection is also performed by the image processing unit 201. The image processing unit 201 stores the positions and information of the extracted flaw candidates in the storage unit 202.

The feature calculation unit 203 reads the data of the flaw candidates stored in the storage unit 202, and calculates the length, width, area, etc. of the flaw candidates obtained by the image processing unit from the read flaw candidate data. The calculated length, width, area, and the like of each flaw candidate are stored in the storage unit 202 in addition to the data of each flaw candidate.

The flaw type determination unit 204 reads the flaw candidate data stored in the storage unit 202 and determines the flaw type by a predetermined algorithm from the read length, width, and area information of the flaw candidates. The flaw degree determination unit 205 includes a storage unit 202
Is read, and the degree of the flaw is determined from the read characteristic amount obtained by the read characteristic amount calculation unit 203 and the flaw type obtained by the flaw type determination unit. Flaw type determination unit 204
The flaw degree determining unit 205 outputs the determined flaw type and flaw degree to the output unit 207 together with the flaw position information. The output unit 207 tracks the position information of the inspection result based on the movement amount information from the movement signal generator 105 based on the signal from the movement signal generator 105, and the inspection result reaches a predetermined position based on the movement information. At this time, a monitor output signal including the inspection result or the flaw detection image is output to the monitor 121 and the screen projector 122. The monitor 121
In addition to the screen projector 122, the image may be output to an annunciator such as a printer, a lamp, or a buzzer provided near the inspection site 120. By adopting such an inspection result display method, the approach of the flaw can be known to the inspector, so that the risk of oversight can be reduced when the detected flaw is visually determined.

FIG. 3 is a schematic diagram for explaining the outline of the visual inspection site shown in FIG. In FIG. 3, reference numeral 120 denotes a visual inspection site, 302 denotes an inspection object, 303 denotes an operation information display panel,
4 is an example of a screen display area displayed on the test object by the screen projector, and 305 is a screen provided adjacent to the test object.

As shown in FIG. 3, the visual inspection site 120
In general, it has a certain size in order to inspect a periodic defect or the like. In addition, the visual inspection site 120 is often provided with an operation information display panel 303 for displaying the specifications of the inspected object during operation. In such a visual inspection place 120, for example, when the image is displayed on the inspection object 302, the image is displayed on the area 304 from the screen projector 208 in a portion adjacent to the visual inspection place 120. Alternatively, in the visual inspection site 120 having a sufficient space, a screen 305 is provided at a location adjacent to the object to be inspected, and by moving the screen on the screen 305, the movement of the line of sight of the inspector can be almost eliminated.

In accordance with a signal from the movement signal generator 105, position information of the inspection result detected by the surface defect inspection apparatus is tracked based on the movement amount information from the movement amount sensor, and based on the information, the surface defect inspection is performed. When the inspection result of the device reaches a predetermined position, the inspection result or a flaw detection image or the like is displayed on the surface of the inspection object or a place adjacent to the inspection object, so that the inspection result is displayed to the inspector. Since the approach of the flaw is known, the risk of oversight can be reduced when the detected flaw is visually determined.

In the case where the inspection result screen of the surface defect inspection apparatus is displayed on the object to be inspected, and the inspection object is a singular point such as a defect, the inspection result is displayed at a width position where the singular point exists. By not displaying, it becomes easy to confirm the singular point of the test object L.

In this embodiment, the case where the screen is used to improve the visibility of the screen when displaying the screen at a place adjacent to the object to be inspected has been described, but there is no problem in the visibility. For example, it may be displayed as it is without providing a screen or the like. Alternatively, when there is a glass window or the like for the safety of the inspector, a screen may be displayed on the glass surface. Display panel (not shown) with inspection results grouped
May be displayed using a lamp or the like.

The present invention is not limited to the above embodiment. For example, the present technology is not limited to the inspection device or line having the configuration introduced here,
The present invention can be applied to all surface defect inspection apparatuses for which inspection information is to be displayed, such as a flaw detection apparatus using magnetism or eddy current, and to a production line for a strip on which the inspection information is installed.

In addition, the present invention can be variously modified and implemented without departing from the gist thereof.

[0028]

As described above, according to the present invention, when the detected defect passes through the vicinity of the object to be inspected or the vicinity of the display section for displaying that there is a defect on the surface, the display is performed. By displaying the defect to the part, it is possible to reduce the movement of the viewpoint, and it is possible to prevent a flaw from being overlooked when performing a visual inspection.

[Brief description of the drawings]

FIG. 1 is a diagram showing a schematic configuration of a continuous production line for producing a thin plate such as a steel plate according to an embodiment of the present invention.

FIG. 2 is a configuration diagram showing a schematic configuration of a surface defect inspection apparatus according to an embodiment of the present invention.

FIG. 3 is a schematic diagram for explaining the outline of a visual inspection site shown in FIG. 1;

[Explanation of symbols]

 REFERENCE SIGNS LIST 100 coil 101 various processing units 105 moving signal generator 108 cutting machine 109 winding machine 110 surface defect inspection device 111 arithmetic unit 112 image input unit 112a front image input unit 112b reverse image input Unit 120 visual inspection station 121 monitor 122 screen projector 201 image processing unit 202 storage unit 203 feature calculation unit 204 flaw type determination unit 205 flaw degree determination unit 207 output unit 208 screen projector 302 ... inspected object 303 ... operation information display panel 304 ... area 305 ... screen

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tsuneo Suyama 1-2-1, Marunouchi, Chiyoda-ku, Tokyo F-term in Nihon Kokan Co., Ltd. (reference) 2G051 AA37 AB01 AB02 AB07 AC01 CA03 CA04 CA07 DA01 DA06 EA11 EA12 EA14 EB01 EB02 EC01 EC05 ED03 FA10

Claims (3)

[Claims] 1. An inspection result display method of a surface defect inspection apparatus for displaying an inspection result of a continuously conveyed belt-like inspection object surface, the method comprising: detecting a defect on the inspection object surface; When the detected defect passes through the vicinity of a display unit that displays that there is a defect near or in the vicinity of the body, the step of displaying that the display unit has a defect is provided. Method of displaying inspection results of a surface defect inspection device. 2. When the surface defect inspection apparatus detects a singular point such as a defect or the like, and displays the inspection result on the inspection object, the inspection is performed at a width position of the inspection object where the singular point exists. 2. The method according to claim 1, wherein the result is not displayed. 3. A moving amount sensor for detecting a moving amount of a belt-like inspected object that is continuously conveyed, and inspecting a defect present on a surface of the inspected object,
A surface inspection unit that detects the position of a defect detected based on the movement amount information from the movement amount sensor; a display unit that displays that there is a defect near or on the surface of the object to be inspected; And a result output unit for instructing the display unit to output a display indicating that the defect is present, based on the position information of the defect detected by the unit and the movement amount information from the movement amount sensor. A surface defect inspection device characterized by the above-mentioned.