KR20190138397A - Vision Checking Method for Distinction of Front/Reverse Side in Piston Ring and the Appratus therefor - Google Patents

Abstract

The present invention relates to a vision inspection method for discriminating the front and rear surfaces of a piston ring, which can remarkably increase precision while being quickly performed in an operation computer with a lower specification, and an apparatus thereof. According to the present invention, the vision inspection method for discriminating the front and rear surfaces of a piston ring comprises a preparation step (S10), an inspection object setting step (S20), a parallel beam irradiation step (S30), an image acquisition step (S40), a pattern image acquisition step (S50), a master pattern image fixing step (S60), a pattern matching step (S70), a front and rear surface discrimination step (S80), and a processing step (S100).

Description

Vision Checking Method for Distinction of Front / Reverse Side in Piston Ring and the Appratus therefor}

The present invention relates to a vision inspection method and apparatus capable of discriminating the front and rear surfaces of a piston ring even when the inclined surface is curved and extremely narrow through 2D image inspection using telecentric illumination and a direction checking program. More specifically, the inclined surface is curved In order to minimize the error range according to the field environment, it is possible to make a very precise and quick determination without using the contact shape measuring device that has a large measurement error and long measuring time when conducting an entire survey. After shooting the image using the telecentric illuminating light, the amount of inclination and angle of inclination of the barrel or tapered surface is measured by 2D image inspection using the direction check program. Front and rear sides can be distinguished, so even on low-end operating computers In order to improve the quality of domestic products and localize expensive inspection equipment and contribute to the development of domestic industry, and to determine the front and rear of the piston ring, it is possible to greatly improve the precision and drastically improve the precision. It relates to a vision inspection method and apparatus.

In general, Piston Rings are three to four rings that are coupled to the piston head to reciprocate with the pistons to prevent gas leakage while scraping engine oil and conducting heat of explosion to the cylinder. Play a role.

The piston ring should prevent both abrasion inside the cylinder during the reciprocating motion and at the same time prevent gas leakage and collect the engine oil. Thus, as shown in FIG. 1, a chamfer or a bevel on the outer circumferential surface of the piston ring is in contact with the inside of the cylinder. Inclined surface such as) should be formed precisely.

In this way, the inclined surface is formed on the piston ring so that the radial thickness becomes thinner at the front side, and the side without change in the radial thickness is determined as the rear side, and the front side is marked with the "R" mark. Marking that the front by laser marking, as shown in Figure 2 when assembled to the piston 'front' should be coupled so as to face the piston head side.

As shown in FIG. 2A, the piston ring 60 coupled as described above is pressurized by the combustion chamber during compression and exhaust, and the piston 70 is raised. The piston ring 60 is raised with less friction by the inclined surface. As shown in FIG. 2B, the inlet and explosion expand the combustion chamber and lower the piston 70. As the bottom of the piston ring 60 comes into close contact with the inner wall of the cylinder 71, friction is increased and the engine oil is scraped down. It works.

If the front and rear surfaces of the piston ring are incorrectly assembled, as shown in FIG. 3A, the upper surface of the piston ring 60 is formed on the inner wall of the cylinder 71 when the piston 70 rises while pressing the combustion chamber during compression and exhaust. The close contact increases friction and wears down the inner wall. In addition, as shown in Figure 3b, during inhalation and explosion, the combustion chamber is expanded and the piston 70 is lowered. The piston ring 60 is lowered with less friction due to the inclination of the chamfer or the slope to scrape the engine oil properly. It can't get down and enter the combustion chamber.

Therefore, if the front and rear surfaces of the piston ring 60 are incorrectly assembled, the output of the engine is lowered, and the wear of the piston ring and the inner surface of the cylinder is accelerated, so that combustion chamber inflow of the engine oil is generated, leading to rapid consumption of the engine oil and The ignition produces sludge in the combustion chamber, and the temperature of the piston rises due to a decrease in thermal conductivity, resulting in piston fusion, engine overheating or engine explosion.

Thus, the front and rear surface discrimination of the piston ring is very important, this inclined surface formed on the outer circumferential surface of the piston ring is very narrow within 0.05 ~ 0.4 mm, there is a problem that is not visible to the naked eye, the inner circumferential surface when forming the chamfer or slope on the outer circumferential surface Equipped with a wider slope of 0.3 ~ 0.9 mm in order to help the naked eye identification, but also this is not easy to identify with the naked eye, so there is a problem to solve this problem, the applicant's registered patent No. 1660481 "compression ring Vision Inspection Method and Apparatus for Discrimination of Front and Back Sides of the Invention has disclosed a very fast and accurate determination method and apparatus using a vision inspection apparatus using a line laser and a laser direction checking program.

However, as shown in FIGS. 4 and 7, the piston ring 60 recently developed has an inclined surface formed on the outer circumferential surface thereof, not a flat surface, and is formed in a curved surface, and is very narrow to 0.01 mm or less when measuring the inclined surface. The invention was not discernible either. Therefore, there is a need for the development of more precise and new methods and devices.

In this way, the method of determining the inclined surface formed on the outer circumferential surface of the piston ring can be determined even if the width is extremely narrow by using a contact shape measuring device as shown in FIG. 5, but this is a physical inspection method. There is a problem that exceeds the error range and takes too much measurement time during the total inspection.

In addition, even if a precise 2D image inspection is to be performed with a vision inspection device similar to the applicant's prior patent, the inclined surface formed on the outer circumference is 0.01 mm or less, so the outline should be taken very precisely when the image is taken. Due to the influence of the diffusion and scattering of the illumination light irradiated on, there was a problem in that accurate image capturing itself was impossible as shown in FIG.

The present invention is devised to solve the above-mentioned problems, without having to use a contact shape measuring instrument having a large measurement error in determining the front and rear surfaces of the extremely narrow piston ring while the inclined surface is curved, and the long measuring time during the whole irradiation. Barrel processing surface or taper processing through 2D image inspection using direction confirmation program after image shooting using telecentric illumination that irradiates parallel rays to minimize the error range according to the field environment while being able to make very precise and rapid identification By measuring the amount of machining and the inclination angle of the surface, the front and rear surfaces of the piston ring can be distinguished even when the inclined surface is curved and extremely narrow.It operates very quickly even on low-end operating computers, dramatically improving the precision and greatly improving work efficiency. Quality improvement and expensive inspection of domestic products To provide a vision testing method and apparatus for discriminating the front and back of the piston ring which can contribute to the non-localization of the domestic industry it is an object.

In order to achieve the above object, the present invention provides a telecentric illumination 10, a camera 20, a loader 80, a gripper 81, an operating computer 40, and a monitor 41 at a predetermined position and a direction thereof. A preparation step (S10) for driving the confirmation program 30; An inspection body setting step (S20) of transferring the piston ring 60 to a predetermined inspection position by a gripper 81 which receives the piston ring 60 which is the inspection body from the loader 80; A parallel ray irradiation step (S30) of irradiating a parallel ray in which the traveling direction is constant from the telecentric illumination 10 in a tangential direction on one side of the circumferential surface of the piston ring 60; Image acquisition step of photographing the outer circumferential surface of the piston ring 60 with the camera 20 positioned in the opposite direction of the telecentric illumination 10 irradiating the parallel light to obtain an image and transmits it to the operating computer 40 (S40) )Wow; A pattern image obtaining step (S50) of obtaining a pattern by extracting a specific portion of the outer circumferential surface from the transmitted image; If the obtained pattern image is an image extracted for the first time after driving, a master pattern image specifying step (S60) of designating the pattern image as a 'master pattern image'; A pattern matching step (S70) for contrasting the obtained pattern image with the master pattern image by using the direction checking program (30) and comparing any one or more of an inclination angle, a position of the highest point, and an amount of the highest point; A determination step (S80) of determining the front, rear or re-inspection of the piston ring 60 using the matching information obtained from the contrasted pattern image and displaying the result on the monitor 41; It includes a processing step (S100) for rotating or re-inspecting the piston ring 60 as it is, according to the determined result; If an error occurs during the progress in all steps, the corresponding piston ring 60 is determined to be re-inspection The object is achieved by providing a vision inspection method for determining the front and rear surfaces of the piston ring characterized in that.

In addition, in the vision inspection method for determining the front and rear surfaces of the piston ring, the pattern matching step (S70) further comprises a machining range matching step (S71) for measuring the highest point and the lowest point of the processing surface of the obtained pattern image. And a peak matching step (S72) for contrasting the obtained pattern image with a master pattern image while comparing a position of the highest point of the processing surface on the upper side or the lower side with respect to the center horizontal line; An inclination angle matching step of contrasting the obtained pattern image with the master pattern image and contrasting the inclination angle of the processed surface (S73); It is preferable to comprise any one or more of these.

In addition, in the vision inspection method for determining the front and rear surfaces of the piston ring, the determination step (S80), or the range of the highest point and the lowest point of the machining surface in the machining range matching step (S71) or exceeds a predetermined predetermined range If not, the processing range determination step (S81) to determine the re-inspection as the measurement value error due to foreign matter and proceed to the processing step (S100); In the peak matching step (S72), if the position of the highest point of the machining surface is located on the lower side with respect to the center horizontal line, it is determined as 'front', and if the position of the highest point is on the upper side with respect to the center transverse line, the highest point is determined. Step S82; In the inclination angle matching step (S73), if the inclination angle of the processing surface is inclined toward the body of the piston ring as a whole, it is determined as 'front', and if the inclination angle of the processing surface as a whole is inclined outward of the piston ring, An inclination angle matching step (S83) determined as a rear surface ';

If the result of the highest point determination step (S82) and the inclination angle matching step (S83) is different from each other, the foreign material contamination determination step (S84) is determined as a re-inspection as the measurement value error of the foreign matter and proceed to the processing step (S100); And a monitor display step (S85) for displaying the result obtained in the above steps on the monitor (41).

In addition, in the vision inspection method for determining the front and rear surfaces of the piston ring, the pattern image acquisition step (S50), when the piston ring 60 is a barrel processing ring, the entire area of one edge of the outer peripheral surface from the transmitted image A base area setting step (S51) of setting a 'base area 31' as a reference for searching; A top point setting step (S52) of setting a portion in which the barrel processing starts from above in the base area to a 'top point 32' as a reference point of a search; A bottom point setting step (S53) of setting a portion in which the barrel processing starts from below in the base area as a 'bottom point 33' as a reference point of a search; A barrel processing area setting step (S54) of searching for an area between the set top point 32 and the bottom point 33 and setting it as a 'barrel processing area 34'; And a barrel processing area pattern image obtaining step (S55) of obtaining a pattern image in the 'barrel processing area 34'.

In addition, in the vision inspection method for determining the front and rear surfaces of the piston ring, the pattern image acquisition step (S50), when the piston ring 60 is a tapered processing ring, 'setting the central portion area from the transmitted image' Setting confirmation area setting step S51 'for setting the confirmation area 35' and obtaining an image; Analyzing the image of the setting confirmation area, if the pattern line is 90 degrees (vertical), it is determined as 'normal', and if the pattern line is 90 degrees or less, it is determined as 're-inspection' and the setting decision is made to proceed to processing step S100. Step S52 '; A 'base area setting step S53' of setting an outer circumferential surface one upper edge portion to a 'base area 36' as a reference for the search if it is determined to be 'normal'; And a tapered processing region pattern image obtaining step (S54 ′) of cutting a predetermined portion from the base region to obtain a tapered processing region pattern image.

The present invention for achieving the above object in the vision inspection device for determining the front and rear surfaces of the piston ring, spaced apart from the tangential direction of the piston ring in order to irradiate a parallel ray with a constant traveling direction with respect to the outer peripheral surface of the piston ring as the test body Being telecentric light 10; A camera 20 positioned in an opposite direction of the telecentric illumination 10 and photographing an outer circumferential surface of a piston ring to which parallel rays are irradiated and transmitting an image thereof; A direction checking program 30 for acquiring a pattern image from the transmitted image and comparing and analyzing the pattern image with a previously input master pattern image to determine front and rear surfaces of the piston ring; An operating computer installed with the direction confirmation program 30 to provide an image received from the camera 20 to the direction confirmation program 30 and to transmit the determined result to the monitor 41 and to transmit a control command according to the result ( The object is achieved by providing a vision inspection device for determining the front and rear surfaces of the piston ring, characterized in that it comprises a 40).

In the vision inspection apparatus for discriminating the front and rear surfaces of the piston ring, the direction confirmation program 30 selects a specific region of the outer circumferential surface of the piston ring from the input image, extracts the pattern image, and extracts the outer circumferential surface from the extracted pattern image. It is preferable to include an algorithm for measuring the machining state and the inclination angle of the contrast with the input master pattern image and to determine the front and rear surfaces of the piston ring.

The effects of the present invention are as follows.

In order to minimize the error range according to the field environment, it is possible to determine very precisely and quickly without using the contact shape measuring device which has a large measuring error and long measuring time in the whole survey when discriminating the front and rear surfaces of the inclined surface and the extremely narrow piston ring. After capturing images using telecentric illumination that illuminates parallel rays, 2D image inspection using a direction check program is performed to measure the amount and angle of inclination of the barrel or taper, so that even if the slope is curved and extremely narrow The front and rear surfaces of the piston ring can be distinguished, so it can be driven very quickly even on low-end operating computers, which greatly improves the precision, prevents defects, and improves the quality of domestic products and localizes expensive inspection equipment. Front and rear discrimination of piston rings that can contribute to industrial development It is a very useful invention that can provide a vision inspection method and apparatus for.

1 is a perspective view and a partially enlarged view showing a piston ring
Figure 2 is a schematic state diagram during the piston movement in the state in which the piston ring normally coupled
3 is a schematic state diagram during piston movement in a state in which the piston ring is reversely coupled
Figure 4 is a perspective view and a partially enlarged photo showing a newly developed piston ring
5 is a schematic view for explaining a method of inspecting the outer circumferential surface of a piston ring using a conventional contact shape measuring instrument;
Figure 6 is a comparison showing the difference between the barrel processing surface shape during the front and rear inspection of the barrel processing ring of the piston ring to be inspected
7 is an enlarged view showing the inclination of the barrel processing surface of the barrel processing ring;
8 is a comparison view showing a barrel surface image using the general illumination and telecentric illumination
9 is a schematic diagram of a vision inspection apparatus using a telecentric illumination and direction checking program to which the present invention is applied;
Figure 10 is a schematic diagram showing the extraction of the pattern image from the barrel processing ring with a vision inspection device to which the present invention is applied
11 is a view for extracting a pattern image of the barrel processing ring with a vision inspection device using a general illumination
12 is a diagram for extracting a pattern image of the barrel processing ring with a vision inspection device using telecentric illumination
Figure 13 is a photograph of extracting the pattern image of the barrel processing surface of the barrel processing ring with a vision inspection device to which the present invention is applied
14 is a photograph comparing the front and rear pattern image of the barrel processing surface obtained by the vision inspection device to which the present invention is applied
15 is a photograph comparing the difference in the shape of the tapered surface when inspecting the front and rear of the tapered machining ring of the piston ring to be inspected
Figure 16 is a photograph showing the process of analyzing the front and rear of the tapered processing ring to determine the vision inspection device to which the present invention is applied
17 is a flowchart showing a vision inspection process applying the present invention
18 is a flow chart showing the subdivided pattern image acquisition step of the inspection process of the present invention;

Hereinafter, the present invention will be described in detail through preferred embodiments. However, the present embodiments should be understood to explain the present invention so that the present invention can be better understood, and the terminology or words used should not be construed as being limited to the common or dictionary meanings, and the inventors will best understand their own inventions. Based on the principle that the concept of the term can be properly defined in order to explain the method, it should be interpreted as meaning and concept corresponding to the technical idea of the present invention, and should not be construed as limiting the present invention.

The present invention does not use an inefficient contact shape measuring instrument due to a large measurement error according to the environment in determining the front and rear surfaces of the piston ring through the inclined surface and a long measurement time in the whole water irradiation, and also disclosed in the applicant's registered patent No. 1660481. Image capture using telecentric illumination that illuminates parallel rays to minimize errors by field conditions while providing very accurate and quick identification even when the slope is curved and extremely narrow so that it cannot be distinguished by one vision inspection device and method By measuring the amount and angle of inclination of the barrel or tapered surface through the 2D image inspection using the post-direction checking program, the front and rear surfaces of the piston ring can be distinguished even when the slope is curved and extremely narrow. Drives very fast on your computer, dramatically improving precision It provides a vision inspection method and device for the front and back of the piston ring which can contribute to the improvement of the quality of domestic products, the localization of expensive inspection equipment and the development of domestic industry by preventing the defect in advance.

(Example 1): Vision inspection apparatus for discriminating the front and rear surfaces of the piston ring when the inclined surface is curved and 0.01 mm or less

Vision inspection apparatus 1 for determining the front and rear surfaces of the piston ring of the present invention, as shown in Figure 9, the telecentric illumination 10, the camera 20, the direction confirmation program 30 and the operating computer 40 It is made to include.

The telecentric illumination 10 is spaced apart from the tangential direction of the piston ring, which is the test body, and irradiates parallel rays having a constant traveling direction with respect to the outer circumferential surface of the piston ring.

Here, parallel rays (Parallel Rays) refers to a ray of light in which the irradiation direction of the light beams are all constant. In the natural system, when the light source irradiates light from a very long distance, the ray is irradiated as a parallel ray. However, the light irradiated from the light source at a short distance is inevitably a light ray spreading around the light source.

Therefore, a separate lens is required to make parallel rays. The lens required at this time is called a telecentric lens, and a light source using a telecentric lens for irradiating parallel rays is used in the present invention. Illumination 10.

The camera 20 photographs the outer circumferential surface of the piston ring 60 positioned in the opposite direction of the telecentric illumination 10 and irradiated with parallel rays, and transmits the image to the operating computer 40.

The direction confirmation program 30 acquires a pattern image by selecting a specific region of the outer circumferential surface of the piston ring from the transmitted image, measures the machining state and the inclination angle of the outer circumferential surface, compares and analyzes the piston with the input master pattern image. A program having an algorithm for discriminating front and rear surfaces of a ring, which is directly produced by the applicant and has a simple but effective principle, which has a small capacity and a very fast processing speed.

The operating computer 40, the direction check program 30 is installed to provide an image received from the camera 20 to the direction check program 30 and transmit the determined result to the monitor 41 and according to the result Pass the control command. Since the installed orientation check program 30 has a small capacity and the image obtained by the camera 20 is also a small 2D image, the operating computer 40 can be sufficiently driven even at a low specification.

Hereinafter, the inspection method using a vision inspection device for determining the front and rear surfaces of the piston ring of the present invention having the above configuration will be described in detail with reference to the drawings.

As shown in FIG. 9, the telecentric illumination 10, the camera 20, the loader 80, the gripper 81, the operating computer 40, and the monitor 41 are installed at predetermined positions and the direction checking program is installed. Drive 30 (S10). (Preparation step)

Next, the piston ring 60 is transferred to the preset inspection position by the gripper 81 which receives the piston chain 60 from the loader 80 (S20).

Next, the parallel ray irradiated with a constant traveling direction from the telecentric illumination 10 is irradiated in the tangential direction of one outer peripheral surface of the piston ring 60 (S30).

Next, photograph the outer circumferential surface of the piston ring 60 with the camera 20 installed in the opposite direction of the telecentric illumination 10 for irradiating the parallel light beam to obtain an image and transmit it to the operating computer 40 (S40). (Image Acquisition Step)

Next, as shown in Figure 10, to extract a specific portion of the outer peripheral surface from the transmitted image to obtain a pattern image (S50). (Pattern Image Acquisition Step)

Next, if the obtained pattern image is the first image extracted after driving, the pattern image is designated as a 'master pattern image' (S60).

Next, the obtained pattern image is contrasted with the master pattern image by using the direction checking program 30, and one or more of an inclination angle, a position of the highest point, and an amount of the highest point are prepared (S70).

Here, subdividing the pattern matching step (S70) is as follows.

First, as shown in FIGS. 12 to 14, the highest point and the lowest point of the processed surface of the obtained pattern image are measured (S71).

Next, the obtained pattern image is compared with the master pattern image, and contrasted with respect to whether the position of the highest point of the processing surface is above or below the center horizontal line (S72).

Next, the obtained pattern image is compared with the master pattern image, but in contrast to the inclination angle of the processing surface (S73).

Next, the front, rear or re-inspection of the piston ring 60 is determined using the matching information obtained from the contrasted pattern image and the result is displayed on the monitor 41 (S80).

Here, subdividing the determination step (S80) is as follows.

In the processing range matching step (S71), if the range of the highest point and the lowest point of the processed surface exceeds or falls below a predetermined predetermined range, it is determined as 're-inspection' as a measurement value error due to foreign matter and the process proceeds to step S100 (S81). ). (Processing range discrimination stage)

Next, as shown in FIG. 14, if the position of the highest point of the processing surface is located on the lower side with respect to the center horizontal line in the highest point matching step (S72), the position of the highest point is located on the upper side with respect to the center horizontal line. It determines with "rear" (S82). (Highest Point Determination)

Next, in the inclination angle matching step (S73), if the inclination angle of the processing surface as a whole is inclined toward the body of the piston ring is determined to be 'front', the inclination angle of the processing surface as a whole is inclined outward of the piston ring as a whole If it is determined as the 'back' (S83). (Slope Angle Matching Step)

Next, if the results of the highest point determination step (S82) and the inclination angle matching step (S83) are different from each other, it is determined as a 're-inspection' as the measurement value error due to the foreign matter, and the process proceeds to step S100 (S84). (Foreign contamination determination stage)

Next, the result obtained in the above steps is displayed on the monitor 41 (S85). (Monitor display step)

Next, according to the determined result, and transmits a control command for rotating or re-inspecting the piston ring 60 as it is (S100). (Processing Step) When it is determined as 'front', the piston ring 60 as it is to the next place. When the transfer is determined to be 'rear', the piston ring 60 is rotated so as to be inverted to be transferred to the next place, and when it is determined to be 'retested', it is transferred to a place waiting for reinspection.

In addition, when an error occurs during the process in all the above steps, the corresponding compression ring is determined as 're-inspection'.

(Example 2): subdividing the pattern image acquisition step (when the piston ring is a barrel processing ring)

Here, subdividing the pattern image acquisition step (S50) when the piston ring is a barrel processing ring is as follows.

When the piston ring 60 is a barrel processing ring, the entire area of one edge of the outer circumferential surface is set as a 'base area 31', which is a reference for searching, from the transmitted image (S51). (Base area setting step)

Next, in the base area, the part of the barrel processing starting from the top is set to 'Top point 32' which is a reference point of the search (S52). (Top point setting step)

Next, a part of the barrel processing starting from the bottom in the base area is set as 'Bottom point 33' which is a reference point of the search (S53). (Bottom point setting step)

Next, the area between the set top point 32 and the bottom point 33 is searched and set as a 'barrel processing area 34' (S54). (Barrel processing area setting step)

Next, a pattern image is acquired in the set 'barrel processing area 34' (S55). (Pattern processing area pattern image acquisition step)

(Example 3): subdividing the pattern image acquisition step (when the piston ring is a tapered machining ring)

Here, subdividing the pattern image acquisition step (S50) when the piston ring is a tapered processing ring is as follows.

When the piston ring 60 is a tapered processing ring, the center portion region is set as the 'setting confirmation region 35' from the transmitted image and the image is acquired (S51 '). (Setting Check Area Setting Step)

Next, the image of the setting confirmation area is analyzed to determine that the pattern line is 'normal' if the pattern line is 90 degrees (vertical), and if the pattern line is 90 degrees or less, the process is determined as 're-inspection' and the process proceeds to step S100. (S52 '). (Setting judgment step)

Next, when it is determined as' normal ', the upper edge portion of one side of the outer circumferential surface is set as the' base area 36 'which is a reference for the search (S53'). (Base area setting step)

Next, a predetermined portion is cut out from the base area to obtain a tapered processing area pattern image (S54 '). (Tapered processing area pattern image acquisition step)

Indeed, vision inspection methods and devices using telecentric illumination and direction checking programs are so accurate that there are no false positives after stabilization.

The present invention is not limited to the above-described specific preferred embodiments, and various modifications can be made by any person having ordinary skill in the art without departing from the gist of the present invention claimed in the claims. Of course, such changes will fall within the scope of the claims.

<Description of Symbols for Main Parts of Drawings>
1: Vision inspection apparatus 10 of the present invention: telecentric illumination
20: camera 30: orientation program
31: Base region 32; Top point
33: Bottom Point 34: Barrel Processing Area
35: Setting confirmation area 36: Base area
40: operating computer 41: monitor
60: piston ring 61: front
62: rear 63: outer slope
64: inner inclined surface 70: piston
71: cylinder 80: loader
81: gripper
S10: preparation step S20: inspection body setting step
S30: Parallel light irradiation step S40: Image acquisition step
S50: pattern image acquisition step S51: base area setting step
S52: Top point setting step S53: Bottom point setting step
S54: Barrel processing area setting step
S55: Barrel processing area pattern image acquisition step S51 ': Setting confirmation area setting step
S52 ': setting judgment step S53': base area setting step
S54 ': Tapered processing area pattern image acquisition step
S60: Master pattern image designation step
S70: pattern matching step S71: machining range matching step S72: highest point matching step S73: tilt angle matching step
S80: Determination step S81: Machining range determination step
S82: Peak Determination Step S83: Inclination Angle Matching Step
S84: Foreign material contamination determination step S85: Monitor display step
S100: processing step

Claims (7)

The telecentric lighting 10, the camera 20, the loader 80, the gripper 81, the operating computer 40, and the monitor 41 are installed at predetermined positions and prepared to drive the direction checking program 30. Step S10;
An inspection body setting step (S20) of transferring the piston ring 60 to a predetermined inspection position by a gripper 81 which receives the piston ring 60 which is the inspection body from the loader 80;
A parallel ray irradiation step (S30) of irradiating a parallel ray in which the traveling direction is uniformly emitted from the telecentric illumination 10 in a tangential direction on one side of the outer peripheral surface of the piston ring 60;
Image acquisition step of photographing the outer circumferential surface of the piston ring 60 with the camera 20 positioned in the opposite direction of the telecentric illumination 10 irradiating the parallel light to obtain an image and transmits it to the operating computer 40 (S40) )Wow;
A pattern image obtaining step (S50) of obtaining a pattern by extracting a specific portion of the outer circumferential surface from the transmitted image;
If the obtained pattern image is an image extracted for the first time after driving, a master pattern image designation step (S60) of designating the pattern image as a 'master pattern image';
A pattern matching step (S70) for contrasting the obtained pattern image with the master pattern image by using the direction checking program (30) and comparing any one or more of an inclination angle, a position of the highest point, and an amount of the highest point;
A determination step (S80) of determining the front, rear or re-inspection of the piston ring 60 using the matching information obtained from the contrasted pattern image and displaying the result on the monitor 41;
And a processing step (S100) of rotating or re-inspecting the piston ring 60 as it is, according to the determined result.
Vision error detection method for determining the front and rear surfaces of the piston ring, characterized in that the piston ring 60 is determined by re-inspection if an error occurs during the operation in all steps. The method of claim 1,
The pattern matching step (S70) further includes a machining range matching step (S71) for measuring the highest point and the lowest point of the machined surface of the obtained pattern image,
A peak matching step (S72) for contrasting the obtained pattern image with a master pattern image while comparing a position of the highest point of the processing surface on the upper side or the lower side with respect to the center horizontal line;
An inclination angle matching step of contrasting the obtained pattern image with the master pattern image and contrasting the inclination angle of the processed surface (S73); Vision inspection method for determining the front and rear surfaces of the piston ring comprising any one or more of. The method of claim 2,
The determination step (S80), if the range of the highest point and the lowest point of the processing surface in the processing range matching step (S71) exceeds or falls below a predetermined predetermined range, it is determined as a 're-inspection' as the measured value error of the foreign matter and the processing step A processing range determining step (S81) to proceed to step (S100);
In the peak matching step (S72), if the position of the highest point of the machining surface is located on the lower side with respect to the center horizontal line, it is determined as 'front', and if the position of the highest point is on the upper side with respect to the center transverse line, the highest point is determined. Step S82;
In the inclination angle matching step (S73), if the inclination angle of the machining surface is inclined toward the body of the piston ring as a whole, it is determined as 'front', and if the inclination angle of the machining surface is inclined outward of the piston ring as a whole, An inclination angle matching step (S83) determined as a rear surface ';
If the result of the highest point determination step (S82) and the inclination angle matching step (S83) is different from each other, the foreign material contamination determination step (S84) is determined as the re-inspection as the measurement value error of the foreign matter and proceed to the processing step (S100);
And a monitor display step (S85) of displaying the results obtained in the above steps on the monitor (41). The method of claim 3, wherein
In the pattern image acquiring step (S50), when the piston ring 60 is a barrel processing ring, a base area for setting the entire area of one edge of the outer circumferential surface from the transmitted image as a 'base area 31' as a reference for searching. A setting step (S51);
A top point setting step (S52) of setting a portion in which the barrel processing starts from above in the base area to a 'top point 32' as a reference point of a search;
A bottom point setting step (S53) of setting a portion in which the barrel processing starts from below in the base area as a 'bottom point 33' as a reference point of a search;
A barrel processing area setting step (S54) of searching for an area between the set top point 32 and the bottom point 33 and setting it as a 'barrel processing area 34';
Barrel processing area pattern image acquisition step (S55) for obtaining a pattern image in the 'barrel processing area (34); vision inspection method for determining the front and rear surfaces of the piston ring. The method of claim 3, wherein
In the pattern image acquiring step (S50), when the piston ring 60 is a tapered machining ring, a setting confirmation region is set to set a central region as a 'setting confirmation region 35' from the transmitted image and acquire an image. Step S51 ';
Analyzing the image of the setting confirmation area, if the pattern line is 90 degrees (vertical), it is determined as 'normal', and if the pattern line is 90 degrees or less, it is determined as 're-inspection' and the setting decision is made to proceed to processing step S100. Step S52 ';
A 'base area setting step S53' of setting an outer circumferential surface one upper edge portion as a 'base area 36' as a reference for the search if it is determined to be 'normal';
And a taper processing region pattern image obtaining step (S54 ') of cutting a predetermined portion from the base region to obtain a tapered processing region pattern image. The vision inspection method for determining the front and rear surfaces of a piston ring. In the vision inspection device for discriminating the front and rear surfaces of the piston ring,
Telecentric illumination 10 which is installed spaced apart in the tangential direction of the piston ring in order to irradiate parallel light beams of which the traveling direction is constant with respect to the outer peripheral surface of the test ring piston ring;
A camera 20 positioned in an opposite direction of the telecentric illumination 10 to photograph an outer circumferential surface of a piston ring to which parallel rays are irradiated and to transmit an image thereof;
A direction checking program 30 for acquiring a pattern image from the transmitted image and comparing and analyzing the pattern image with a previously input master pattern image to determine front and rear surfaces of the piston ring;
An operating computer installed with the direction confirmation program 30 to provide an image received from the camera 20 to the direction confirmation program 30 and to transmit the determined result to the monitor 41 and to transmit a control command according to the result ( 40); Vision inspection apparatus for determining the front and rear surfaces of the piston ring, characterized in that comprising a. The method of claim 6,
The direction confirmation program 30 selects a specific region of the outer circumferential surface of the piston ring from the input image, extracts the pattern image, and measures the machining state and the inclination angle of the outer circumferential surface from the extracted pattern image and inputs the master pattern image. Vision inspection apparatus for discriminating the front and rear surfaces of the piston ring comprising a contrast analysis and an algorithm for determining the front and rear surfaces of the piston ring.

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