KR101908793B1 - Device and method of Rolled-surface Recognition for Billets - Google Patents

Abstract

A billet rolled face recognition apparatus according to an embodiment of the present invention includes an image acquisition unit for acquiring a picked-up image of a cut surface of a billet, an image processing unit for processing the picked-up image received from the image acquisition unit, A rolling surface information generating unit for detecting a crushing part of the cut surface of the billet using the image information and generating an identification number for the rolling surfaces of the billet based on the crushing part, And an automatic polishing information generator for generating automatic polishing information by integrating surface defect information of the rolled surfaces.

Description

Technical Field [0001] The present invention relates to a billet rolled surface recognition apparatus and method,

The present invention relates to a billet rolled surface recognition apparatus and method.

Wire rod is a linear steel made by rolling a billet and can be used in various fields such as tire cord and construction. Such wire rods are generally required to have higher strength than general steel rods, and accordingly there is a high demand for surface quality control of billets as a raw material for rolling rods.

If there is a defect on the surface of such a billet, there is a high possibility that the final product after the wire rolling will cause cracking due to cracking. Therefore, various techniques have been developed for detecting surface defects and eliminating the defects.

In the conventional billet correcting process, when the surface defect inspection apparatus detects and marks defects on the surface, a person individually finds defect information in the next process and removes defects with a polishing machine. In such a conventional method, since rotation is accompanied in the billet transferring process, it is impossible to precisely locate the surface defect occurrence position in the front and back process and to remove 100% of the surface defect.

Japanese Patent Publication No. 2016-24769

SUMMARY OF THE INVENTION The present invention has been made in order to solve the problems of the prior art described above, and it is a technical aspect of the present invention to provide a method and apparatus for manufacturing a billet, by detecting an image on a cut surface of a billet being conveyed, Provided are an apparatus and method for automating information management of surface defect occurrence positions in a correction process and automatically removing surface defects of a billet with a polishing machine.

A billet rolled face recognition apparatus according to an embodiment of the present invention includes an image obtaining unit that obtains a picked-up image of a cut surface of a billet, an image processing unit that processes the picked-up image received from the image obtaining unit, A rolling surface information generating unit for detecting a crushing part of the cut surface of the billet using the image information received from the crushing unit and generating an identification number for the rolling surfaces of the billet based on the crushing part, And an automatic polishing information generation unit for generating the automatic polishing information by integrating the number and the surface defect information of the rolled surfaces.

In one embodiment, the image acquiring section includes: a billet detection sensor for detecting presence or absence of the billet on a conveying roller and outputting a trigger signal, a spot illumination device for irradiating illumination to the billet, As shown in FIG.

In one embodiment, the spot illumination device may be arranged to obliquely irradiate a circular spot illumination to the cut surface of the billet.

In one embodiment, the spot illumination device may include a light emitting diode.

In one embodiment, the billet detection sensor is capable of outputting the trigger signal when the transport roller is driven such that the cut surface of the billet passes through the cut surface imaging point.

In one embodiment, the image processing unit binarizes the sensed image to extract a boundary of the cut surface, searches a center point of the billet at the extracted boundary, It is possible to set the image processing interest regions at a predetermined distance in the corner direction and to calculate image information including an average value of the brightness distribution of the image processing interest regions.

In one embodiment, the rolled surface information generator may detect a crushed portion of a cut surface of the billet, and give identification numbers sequentially from the rolled surface positioned on the left side in the counterclockwise direction with respect to the crushed portion.

A billet rolled face recognition method according to an embodiment of the present invention includes the steps of acquiring a picked-up image of a cut surface of a billet, processing the picked-up image to calculate image information, Generating an identification number for the rolling surfaces of the billet on the basis of the crushing portion and integrating the identification number for the rolling surfaces with the surface defect information of the rolling surfaces, And generating information.

In one embodiment, acquiring a picked-up image of a cut surface of the billet comprises:

Irradiating the spot illumination to the cut surface of the billet by the spot illumination device at an angle; Outputting a trigger signal at the billet detection sensor when the cut surface of the billet passes the cut surface image pickup point, and imaging the image of the cut surface of the billet by the camera receiving the trigger signal.

In one embodiment, the step of processing the sensed image and calculating image information may include extracting a boundary line of the cut surface by binarizing the sensed image, searching a center point of the billet based on the extracted boundary line Setting image processing regions of interest at a location a predetermined distance in the direction of the four corners of the section from the central point of the searched billet, and calculating average values of the brightness variance for each of the image processing regions of interest .

In one embodiment, calculating the average values of the brightness variance for each of the image processing ROIs includes calculating a first brightness variance value in the horizontal direction and a second brightness variance value in the vertical direction for one image processing ROI, , And calculating an average value of the first brightness variance value and the second brightness variance value.

In one embodiment, the step of detecting the fractured portion of the cut surface of the billet may include determining the image processing region of interest having the largest average value of the brightness variance as the shredding portion by comparing the calculated average values of the brightness variance.

In one embodiment, the step of generating an identification number for the rolling surfaces of the billet may be a step of providing an identification number counterclockwise from the rolling surface on the left side relative to the crushing portion of the billet.

According to one embodiment of the present invention, an image of a cut surface is imaged for each of the billets being conveyed, and the image is analyzed to provide identification information to the rolling surfaces of the billet, thereby automating billet rolled surface position tracking Automatic polishing machine provides automatic polishing information to automatically remove defects on the billet surface.

According to an embodiment of the present invention, the crushed portion of the billet cut surface is detected using the average value of the brightness variance, and the number assigned to the rolled surfaces of the billet is assigned based on the crushed portion, The rolled surface can be recognized.

1 is a block diagram illustrating a billet rolled surface recognition apparatus according to an embodiment of the present invention.
2 is a reference diagram for explaining an embodiment of the image acquisition unit shown in FIG.
3 is a reference diagram for explaining an embodiment of the image acquisition unit shown in FIG.
4 is a reference diagram for explaining an embodiment of the image processing unit shown in FIG.
5 is a reference view for explaining an embodiment of the rolled surface information generating unit shown in FIG.
6 is a reference view for explaining an embodiment of the automatic polishing information generating unit shown in FIG.
7 is a reference diagram for explaining a conventional billet correction process.
8 is a reference view illustrating an automatic polishing 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 block diagram illustrating a billet rolled surface recognition apparatus according to an embodiment of the present invention.

1, the billet rolled surface recognizing apparatus 100 may include an image obtaining unit 110, an image processing unit 120, a rolled surface information generating unit 130, and an automatic polishing information generating unit 140 have.

The image acquiring unit 110 may acquire a sensed image of the cut surface of the billet while the billet is being conveyed.

The image processing unit 120 may process the sensed image to calculate brightness distribution information for regions of interest set in four corners of the cut surface of the billet.

The rolled surface information generator 130 may identify the crushing portion of the cut surface and generate an identification number of the rolling surfaces of the billet according to a predetermined rule based on the crushed portion of the cut surface.

The automatic polishing information generating unit 140 may generate the automatic polishing information by integrating the identification number of the billet rolling surface and the surface defect information detected by the surface defect inspection apparatus.

Hereinafter, the billet rolled face recognition apparatus 100 will be described in more detail with reference to Figs. 2 to 3. Fig.

2 is a reference view for explaining an embodiment of the image obtaining unit 110 shown in FIG. 3 is a reference diagram for explaining an embodiment of the image acquisition unit shown in FIG.

Referring to FIG. 2, the image acquisition unit 110 may include a camera 210, a spotlight device 220, and a billet detection sensor 230.

The camera 210 includes a lens and is capable of imaging a cut surface of the moving billet B to produce a picked-up image. The spot illumination device 220 is a circular spot illumination and is installed obliquely with respect to the cut surface of the billet B at the cut surface image pick-up point 240 as shown in the illustrated example, so that the difference of the reflected light according to the roughness of the cut surface of the billet B Thereby minimizing the influence of light from the outside. The spot illumination 220 may be, for example, a light emitting diode (LED) illumination. The billet detection sensor 230 senses the presence or absence of the billet B on the conveying roller 260. When the cut surface of the billet B passes the cut surface imaging point 240, The trigger signal can be output.

2 and 3, the billet B, which was on the transfer table 270 by the billet turnover device 250 of FIG. 3, is seated on the conveying roller 260 The billet detection sensor 230 detects the billet B. When the billet (B) is detected, the spot light (220) illuminates the billet (B). When the billet conveyance roller 260 is driven and the cut surface of the billet B passes through the imaging point 240, the billet detection sensor 230 outputs a video imaging trigger signal to the camera 210. Upon receiving the image pickup trigger signal, the camera 210 images the image (or image) of the cut surface of the billet B multiple times (for example, four times).

The image acquisition unit 200 switches the spot illumination 220 off until the billet detection sensor 230 detects the next billet B and the camera 210 can switch to the standby mode have.

4 is an image developed view illustrating an embodiment of the image processing unit 120 shown in FIG.

Referring to FIG. 4, the image processing unit 400 shows a process of processing an image of a cut surface of the billet.

The image processing unit 400 receives the captured image 410 from the camera 210 and performs a binarization process to extract the boundary line of the cut surface of the billet 420. The extracted centerline point 430a of the billet (ROI) 430b of the four regions at a predetermined distance in the four corner directions from the searched center point 430a (430).

The image processing unit 400 may calculate the average value and the numerical value of the brightness variance by obtaining the brightness variance 440a in the horizontal direction and the brightness variance 440b in the vertical direction with respect to each image processing interest area 430b 440).

5 is an image developed view for explaining an embodiment of the rolled surface information generator 130 shown in FIG.

The rolled surface information generating unit 130 compares the numerical data calculated by the image processing unit 120 and determines whether the image processing attention area 430b having the largest average value of brightness dispersion is divided into a shredding unit 610a, The region 430b may be determined as the breaking portion 610b (610).

The rolling surface information generating unit 130 generates the rolling surface information about the rolling surfaces of the billet in the order of A, B, C, and D in the counterclockwise direction from the rolling surface on the left side based on the edge of the billet adjacent to the crushing unit 610a, (620).

FIG. 6 is a block diagram for explaining an embodiment of the automatic polishing information generating unit 140 shown in FIG.

The automatic polishing information generation unit 140 integrates the rolled surface identification information 710 provided by the rolled surface information generation unit 130 and the surface defect information 720 detected by the surface defect inspection apparatus d of FIG. Surface number, surface defect position, defect size information, and the like.

7 is a conventional billet correction process.

7, the billet correction process is composed of a camber measurement (a), a shot blast (b), a surface defect inspection device (c), and a grinder (d) It can be seen that there is no means to confirm.

Fig. 8 is a process chart of a billet correction to which the present invention is applied.

8, the billet correction process according to the present invention includes a camber measurement (a), a shot blast (b), a rolled surface recognizing device (c), a surface defect inspection device (d) e so that the automatic polishing machine e can automatically remove defects on the billet surface by receiving the automatic polishing information from the rolled surface recognizing device c.

In this way, it is possible to identify the rolling surface of the billet by means of the proposed billet rolling surface recognition method and device configuration, and it is possible to automatically grind using the identification information of the rolling surface of the billet and the surface defect information in the automatic polishing machine, .

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims. .

100: Billet rolling surface recognition device 110: Image acquiring unit
120: image processing unit 130: rolling surface information generating unit
140: automatic polishing information generating unit 210:
220: Light emitting diode (LED) spot lighting 230: Billet detection sensor
240: Cutting plane imaging point 250: Billet turnover device
260: Feed roller 270: Feed table
410: Section image 420: Section boundary extraction
430: Setting the area of interest 440: Quantifying the area of interest
610: Detection of fractured part of cut surface 620: Identification of rolled surface identification number
710: Rolling surface identification information 720: Surface defect information
730: Automatic polishing information

Claims (13)

An image obtaining unit obtaining an image picked up with respect to a cut surface of the billet;
An image processing unit for processing the sensed image received from the image acquiring unit;
A rolling surface information generation unit for detecting a crushing part of the cut surface of the billet using the image information received from the image processing unit and generating an identification number for the rolling surfaces of the billet based on the crushing part; And
And an automatic polishing information generator for generating the automatic polishing information by integrating the identification number of the rolled surfaces and the surface defect information of the rolled surfaces,
The image processing unit binarizes the sensed image to extract a boundary line of the cut surface, searches a center point of the billet at the extracted boundary line, and searches the center point of the billet from the center point of the detected billet, A billet rolling surface recognizing device for setting image processing interest areas in a distance and calculating image information including an average value of brightness variances of the image processing interest areas,
The method according to claim 1,
The image acquiring unit may acquire,
A billet detection sensor for detecting presence or absence of said billet on a conveying roller and outputting a trigger signal;
A spot illumination device for illuminating the billet; And
And a camera for receiving the trigger signal and picking up an image of a cut surface of the billet.
3. The method of claim 2,
Wherein the spot illumination device is arranged to obliquely irradiate a circular spot light on the cut surface of the billet.
3. The method of claim 2,
Wherein the spot illumination device includes a light emitting diode.
3. The method of claim 2,
Wherein the billet detection sensor outputs the trigger signal when the feed roller is driven and the cut surface of the billet passes the cut surface image pick-up point.
delete The method according to claim 1,
Wherein the rolling surface information generation unit sequentially assigns identification numbers from the rolling surface on the left side to the counterclockwise direction on the basis of the crushed portion of the billet.
Obtaining a picked-up image of a cut surface of the billet;
Processing the captured image to produce image information;
Detecting a fractured portion of a cut surface of the billet using the image information;
Generating an identification number for the rolling surfaces of the billet based on the crushing portion; And
And integrating the identification number for the rolled surfaces and the surface defect information of the rolled surfaces to generate automatic polishing information,
Wherein processing the captured image to calculate image information comprises:
Binarizing the sensed image to extract a boundary line of the cut surface;
Searching a center point of the billet based on the extracted boundary line;
Setting image processing regions of interest at a predetermined distance in the direction of the four corners of the cut surface from a center point of the searched billet; And
And calculating average values of brightness variances for each of the image processing ROIs.
9. The method of claim 8,
Wherein acquiring an imaged image of a cut surface of the billet comprises:
Irradiating the spot illumination to the cut surface of the billet by the spot illumination device at an angle; Outputting a trigger signal at the billet detection sensor when the cut surface of the billet passes the cut surface image pick-up point; And
And picking up an image of a cut surface of the billet by a camera that has received the trigger signal.
delete 9. The method of claim 8,
Calculating average values of brightness variance for each of the image processing ROIs,
Obtaining a first brightness variance value in a horizontal direction and a second brightness variance value in a vertical direction for one image processing ROI; And
And calculating an average value of the first brightness variance value and the second brightness variance value.
9. The method of claim 8,
Wherein the step of detecting the fractured portion of the cut surface of the billet comprises:
And comparing the calculated average values of the brightness variances to determine the image processing region of interest having the largest average brightness variance as the crusher.
9. The method of claim 8,
Wherein the step of generating an identification number for the rolling surfaces of the billet is to identify the billet in the counterclockwise direction from the rolling surface on the left side of the crushing portion of the billet.

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