KR101926635B1 - Inspection apparatus for welding tip of spot welding gun - Google Patents
Inspection apparatus for welding tip of spot welding gun Download PDFInfo
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- KR101926635B1 KR101926635B1 KR1020160164296A KR20160164296A KR101926635B1 KR 101926635 B1 KR101926635 B1 KR 101926635B1 KR 1020160164296 A KR1020160164296 A KR 1020160164296A KR 20160164296 A KR20160164296 A KR 20160164296A KR 101926635 B1 KR101926635 B1 KR 101926635B1
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- welding tip
- welding
- tip
- camera module
- pressing plate
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/8851—Scan or image signal processing specially adapted therefor, e.g. for scan signal adjustment, for detecting different kinds of defects, for compensating for structures, markings, edges
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/36—Auxiliary equipment
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/8851—Scan or image signal processing specially adapted therefor, e.g. for scan signal adjustment, for detecting different kinds of defects, for compensating for structures, markings, edges
- G01N2021/8887—Scan or image signal processing specially adapted therefor, e.g. for scan signal adjustment, for detecting different kinds of defects, for compensating for structures, markings, edges based on image processing techniques
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/026—Specifications of the specimen
- G01N2203/0296—Welds
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Biochemistry (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mechanical Engineering (AREA)
- Analytical Chemistry (AREA)
- Pathology (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Signal Processing (AREA)
- Computer Vision & Pattern Recognition (AREA)
- Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
Abstract
The present invention provides a welding tip inspecting apparatus for a spot welding gun capable of inspecting the contamination degree of a welding tip without damaging a part even if the welding tip transported by the welding tip transporting gun is inserted and pressed with an error of several millimeters at the reference inserting position .
Description
The present invention relates to an apparatus for inspecting a welding tip of a spot welding gun. More particularly, the present invention relates to an apparatus for inspecting a welding tip of a spot welding gun, To a welding tip inspection apparatus for a spot welding gun capable of inspection.
Generally, spot welding is a type of resistance welding technique in which two or three sheets of metal sheet for welding are stacked and placed between a pair of spot welding guns and pressed with a pair of spot welding guns A method of applying a current to a spot welding gun and welding a metal plate using resistance heat generated therefrom. Such spot welding is also called spot welding, but it is widely used for thine plate welding because of its advantage of short welding time.
In spot welding, part of the base material after welding is deposited on the tip of the spot welding gun, so that the spot welding gun can not be used for a long time. To prevent this, the spot welding gun is protected by attaching a welding tip of copper material to the end of the spot welding gun.
The condition of the welding tip is important for good quality welding to be performed. However, the welding tip tip is contaminated during 100 ~ 200 times of welding and can not be used. At this time, the end of the welding tip is polished by using a dresser (ATD: Auto Tip Dresser). Using a dresser (ATD), the tip of the contaminated welding tip is cut off and the welding tip inspection device is used to inspect the welding tip section for foreign matter. If the test result is bad, transfer the welding tip to the dresser (ATD) with the welding tip transfer gun (GUN) to polish the welding tip. Typically, the dresser (ATD) and the welding tip inspection apparatus are combined and installed in one package.
On the other hand, an inspection apparatus using a color sensor and an inspection apparatus using a camera have been known as a welding tip inspection apparatus. The inspection apparatus using the color sensor measures the spectrum of the light reflected on the end face of the welding tip after irradiating the white LED to judge whether or not the welding tip is contaminated. Although the measurement speed is fast, there is a problem that it can not be measured properly depending on the environmental part such as the distance and angle of the welding tip.
As shown in FIG. 9, an inspection apparatus using a camera disclosed in Korean Patent No. 10-1385922 (the name of the invention: spot welding electrode inspection apparatus) photographs a cross section of a welding tip with a 2D camera, It is judged whether or not the tip section is contaminated. 9, the apparatus for inspecting an electrode for spot welding according to Korean Patent No. 10-1385922 has a structure in which an electrode (welding tip) is fixed to a fixing
However, the conventional spot welding electrode inspection apparatus is embodied such that the welding tip transporting gun inspects the welding tip by using the camera while feeding the welding tip and inserting it into the fixing
The present invention has been made in view of the above background and it is an object of the present invention to provide a welding apparatus and a welding method for welding a welding spot, A welding tip inspection apparatus for a welding gun is provided.
The present invention also relates to a welding tip inspection apparatus for a spot welding gun capable of promptly and conveniently processing a replacement operation of a camera module by a user.
According to another aspect of the present invention, there is provided an apparatus for inspecting a welding tip of a spot welding gun including a plurality of camera illumination light sources, a camera module for photographing a tip of the welding tip, A main circuit board on which a main circuit module for analyzing the degree of contamination of the welding tip is mounted through an image of the tip of the welding tip;
A pressing plate having a first penetrating portion through which the welding tip to be inspected passes; A center guide portion in which a mounting portion in which the pressure plate is mounted is formed; A protective case having an insertion portion into which a welding tip is inserted at a position corresponding to the first through-hole of the pressing plate;
And a housing detachably connected to the main circuit board and having a second penetrating portion connected to the first penetrating portion of the pressing plate and a seating portion on which the pressing plate and the center guide portion are seated.
The pressing plate of the welding tip inspection apparatus of the spot welding gun according to the present invention is provided with a first light passage portion through which light reflected from the welding tip passes, a housing extending from the second penetration portion, And a second light passage portion through which light reflected by the second light passage passes.
A connector for connecting a camera module is formed on a main circuit board of a welding tip inspecting apparatus for a spot welding gun according to the present invention. The housing has an insertion portion for inserting a circuit board on which the camera module is mounted, Is formed.
The apparatus for inspecting a welding tip of a spot welding gun according to the present invention is characterized in that it further comprises a protection member detachably coupled to the housing and rotatably supported by the air cylinder to protect the insertion portion of the protection case.
As described above, the apparatus for inspecting a welding tip of a spot welding gun according to the present invention has the following advantages.
First, even if the welding tip transferred by the welding tip transfer gun is inserted and pressed with an error of several millimeters at the reference insertion position, the contamination of the welding tip can be inspected without damaging the part.
Second, the user can quickly and conveniently process replacement of the camera module.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exemplary view for explaining a welding tip inspection apparatus for a spot welding gun according to the present invention; FIG.
FIGS. 2A and 2B are views for explaining a protective member for a welding tip inspection apparatus of a spot welding gun according to the present invention.
3 is an exploded view of components of a welding tip inspection apparatus for a spot welding gun according to the present invention.
4 is a cross-sectional view of a welding tip inspection apparatus for a spot welding gun according to the present invention.
5A and 5B are diagrams for explaining a change in the position of a pressing plate of a welding tip inspection apparatus for a spot welding gun according to the present invention.
6 is a view for explaining a process of replacing a camera module of a welding tip inspection apparatus of a spot welding gun according to the present invention.
FIG. 7 illustrates a process of photographing a cross section of a welding tip through a camera module and a reflector used in a welding tip inspection apparatus for a spot welding gun according to the present invention.
8 is an exemplary view for explaining a process of photographing a cross section of a welding tip with a camera module and judging whether or not the cross section of the welding tip is contaminated through image processing.
9 is an exemplary view for explaining a welding tip inspection apparatus of a conventional spot welding gun.
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, wherein like reference numerals are used to designate identical or similar elements, and redundant description thereof will be omitted. In the following description of the embodiments of the present invention, a detailed description of related arts will be omitted when it is determined that the gist of the embodiments disclosed herein may be blurred.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. , ≪ / RTI > equivalents, and alternatives.
Terms including ordinals, such as first, second, etc., may be used to describe various elements, but the elements are not limited to these terms. The terms are used only for the purpose of distinguishing one component from another.
FIG. 1 is an exemplary view for explaining a welding tip inspecting apparatus for a spot welding gun according to the present invention, FIGS. 2a and 2b are illustrations for explaining a protecting member for a welding tip inspecting apparatus of a spot welding gun according to the present invention, FIG. 3 is an exploded view of components of a welding tip inspection apparatus for a spot welding gun according to the present invention, and FIG. 4 is a sectional view of a welding tip inspection apparatus for a spot welding gun according to the present invention.
1, 2A, 2B, 3, and 4, the welding
The
The welding
As shown in Fig. 3, the internal components of the welding tip inspection apparatus of the spot welding gun according to the present invention include a
The
In Fig. 3, the
The
3, the
The
4, the welding tip is inserted between the
The
5A and 5B are diagrams for explaining a change in the position of a pressing plate of a welding tip inspection apparatus for a spot welding gun according to the present invention. The
6 is a view for explaining a process of replacing a camera module of a welding tip inspection apparatus of a spot welding gun according to the present invention.
The
The apparatus for inspecting a welding tip of a spot welding gun according to the present invention is characterized in that an image of a cross section of a pair of
As shown in FIG. 8, the process of determining whether the welding tip cross-section is contaminated by photographing a cross-section of the welding tip according to the present invention with a camera module and performing image processing includes an image obtaining step S811, a channel dividing step S812, (Step S813), a projection conversion step S814, an automatic contrast enhancement step S815, an edge detection step S816, a pressing plate inner diameter detection step S817, a welding tip section detection step S818, , And a contamination degree detection step S819.
The image acquiring step (S811) is a step of receiving the RGB image of the welding tip front end from the camera module. In this case, the RGB image contains various color information. In order to omit unnecessary color information review in the process of analyzing the contamination degree of the welding tip, the RGB image is converted into the YCbCr image including the luminance information, the blue information and the red information .
In the present specification, the RGB image is input and then converted into a YCbCr image. However, the present invention is not limited thereto, and a YCbCr image can be input directly from the camera module.
In the channel segmenting step S812, the tip region is detected based on the luminance information, the blue information, and the red information. In addition, in order to detect the front end face using only the Y image including the luminance information, the YCbCr image includes luminance information A Cb image including a Y image, luminance information, and blue information, luminance information, and a Cr image including red information.
In the ROI selection step S813, an area corresponding to the preset tip color information may be extracted from the YCbCr image to detect the welding tip area, and the detected welding tip area may be designated as the area of interest.
The projection conversion step S814 is a step of projecting a point in the three-dimensional space onto the image plane. The automatic contrast enhancement step (S815) may binarize the welding tip image based on a preset reference value to obtain welding tip binarization data. For example, the welding tip binarization data can be obtained by digitizing an area lower than a preset reference value in the welding tip image to 0 and mapping an area higher than a preset reference value to 255.
The edge detection step S816 may extract the welding tip edge based on the welding tip binarization data. For example, by detecting the boundary region between 0 and 255 on the basis of the welding tip binarization data, the outer edge portion of the shape of the welding tip, that is, the edge of the welding tip can be extracted.
The pressing plate inner diameter detecting step (S817) is a step of detecting a region corresponding to the first penetrating
In the welding tip section detection step (S818), a plurality of ellipses are detected in the ellipse detection step, and the diameter of each ellipse detected and the height ratio of the detected tip area are compared with a predetermined reference ratio to determine an ellipse It is possible to perform a line section determination step of determining the line section. In this case, the diameter of each ellipse detected and the height ratio of the detected interest region are compared with a preset reference ratio, and an ellipse having a minimum error among the ellipses contained within the allowable range of the plurality of ellipse reference ratios is determined as the front end face .
The contamination level detection step (S819) can compare the color information of each pixel in the detected front cross section with preset reference color information to measure the contamination degree of the front end face. The contamination degree detection step S819 may include a pixel counting step and a pollution degree measuring step. Counting the number of all the pixels located inside the edge detected from the differentiated tip area detection image and counting black pixels having low brightness among the pixels located inside the edge as a contaminated pixel and counting them. The number of contaminated pixels counted can be divided by the total number of pixels for the front end face to calculate the contamination ratio for the welding tip front end, and the contamination degree can be measured according to the level value of each contaminated pixel.
While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, 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 scope of the invention as defined by the appended claims. Accordingly, the true scope of the present invention should be determined only by the appended claims.
11, 12: Welding tips
100: Welding tip inspection tool for spot welding gun
110: PLC cable port
120: Ethernet port
130, 170: Protective case
131, 171:
135, 175:
140: upper housing
141:
142: second through-
143: second light passage portion
144:
150: Lower housing
151:
152: second through-
153: second light passage portion
154:
160: Protection member
161: Air cylinder
162:
310, 390: pressure plate
311, 391:
312, 392: a first light-
320, 380: center guide portion
330, 360: Camera module
340, 370: reflector
350: main circuit board
351: Light source for camera illumination
352: Display device
353: Camera module connection part
Claims (5)
A protective case having an insertion portion into which a welding tip to be inspected is inserted;
A first penetration portion through which the welding tip passes at a position corresponding to an insertion portion of the protective case, and a first light passage portion through which light reflected by the welding tip passes;
A center guide part formed of a material having elasticity and formed with a mounting part for mounting the pressing plate therein;
A second light passing portion through which the light reflected by the welding tip passes, and a seating portion on which the pressing plate is seated, the second penetrating portion being connected to the first penetrating portion of the pressing plate, An upper housing and a lower housing;
A light source for camera illumination provided around an inspecting space perpendicular to an inserting portion of the protective case, a first penetrating portion of the pressing plate and a second penetrating portion of the upper housing or the lower housing, A main circuit module for analyzing the contamination degree of the welding tip through an image of the tip of the welding tip, a display device for receiving the display control signal corresponding to the welding tip pollution degree judgment result from the main circuit module and outputting the luminescence color, A main circuit board on which a camera module connecting portion connected to be detachable and attachable is formed;
A camera module protruding from the protective case to protect the camera module mounted on the camera module connecting portion of the main circuit board and sequentially passing through the second light passing portion of the upper housing and the lower housing and the first light passing portion of the pressing plate And a protrusion on which a reflector for reflecting light reflected from the welding tip to the camera module is mounted,
Wherein the protective case is detachably coupled to the housing,
Wherein the housing has an insertion portion into which a circuit board on which the camera module is mounted is inserted at a position corresponding to the camera module connection portion of the main circuit board,
Wherein the welding tip inspection apparatus comprises:
A protective member detachably coupled to the housing and rotated during forward movement by an air cylinder to prevent foreign matter from penetrating through the insertion portion of the protective case;
Further comprising a welding tip for welding the spot weld gun.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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KR1020160164296A KR101926635B1 (en) | 2016-12-05 | 2016-12-05 | Inspection apparatus for welding tip of spot welding gun |
PCT/KR2017/009210 WO2018105853A1 (en) | 2016-12-05 | 2017-08-23 | Apparatus for inspecting welding tips of spot welding guns |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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KR1020160164296A KR101926635B1 (en) | 2016-12-05 | 2016-12-05 | Inspection apparatus for welding tip of spot welding gun |
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KR20180064102A KR20180064102A (en) | 2018-06-14 |
KR101926635B1 true KR101926635B1 (en) | 2018-12-07 |
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KR1020160164296A KR101926635B1 (en) | 2016-12-05 | 2016-12-05 | Inspection apparatus for welding tip of spot welding gun |
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WO (1) | WO2018105853A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20210142048A (en) * | 2020-05-15 | 2021-11-24 | (주)엔정보기술 | Nondestructive inspection device using 60GHz radar of the welding part of the ship |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
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KR102199505B1 (en) | 2019-06-13 | 2021-01-06 | 아진산업(주) | Apparatus and method for inspecting contamination of welding tip based on fisheye camera |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009285725A (en) | 2008-06-02 | 2009-12-10 | Toyota Auto Body Co Ltd | Welding electrode inspection device and welding electrode inspection method |
US20140333756A1 (en) * | 2012-02-01 | 2014-11-13 | Keylex Corporation | Electrode inspection apparatus for spot welding |
JP2016525690A (en) | 2013-08-01 | 2016-08-25 | シンテルレーゲ・エス.アール.エル.SINTERLEGHE S.r.l. | Optical device for detecting the quality of welding gun electrodes |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5470370B2 (en) | 2009-10-27 | 2014-04-16 | 株式会社キーレックス | Electrode inspection device for spot welding |
KR101660452B1 (en) * | 2014-12-01 | 2016-09-28 | 아진산업(주) | Test apparatus for tip of spot wellding gun |
KR101698388B1 (en) * | 2015-03-23 | 2017-01-20 | 주식회사휴비스 | Verification apparatus for electrode tip of spot welding device |
-
2016
- 2016-12-05 KR KR1020160164296A patent/KR101926635B1/en active IP Right Grant
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2017
- 2017-08-23 WO PCT/KR2017/009210 patent/WO2018105853A1/en active Application Filing
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009285725A (en) | 2008-06-02 | 2009-12-10 | Toyota Auto Body Co Ltd | Welding electrode inspection device and welding electrode inspection method |
US20140333756A1 (en) * | 2012-02-01 | 2014-11-13 | Keylex Corporation | Electrode inspection apparatus for spot welding |
JP2016525690A (en) | 2013-08-01 | 2016-08-25 | シンテルレーゲ・エス.アール.エル.SINTERLEGHE S.r.l. | Optical device for detecting the quality of welding gun electrodes |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20210142048A (en) * | 2020-05-15 | 2021-11-24 | (주)엔정보기술 | Nondestructive inspection device using 60GHz radar of the welding part of the ship |
KR102420519B1 (en) * | 2020-05-15 | 2022-07-15 | (주)엔정보기술 | Nondestructive inspection device using 60GHz radar of the welding part of the ship |
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WO2018105853A1 (en) | 2018-06-14 |
KR20180064102A (en) | 2018-06-14 |
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