JP7353680B1 - Detection device, detection system, detection method, detection program and recording medium - Google Patents

Abstract

The present invention provides a detection device, a detection system, a detection method, a detection program, and a recording medium that can accurately detect an abnormality in a caulked portion. [Solution] A detection device 3 detects an abnormality in an annular crimped portion formed by crimping a cylindrical mouthpiece into a circular opening formed in a metal plate member, and images the crimped portion. An input unit 60 (image acquisition means) that acquires the crimped part image P from the imaging device 2, and a first ridgeline on the inner circumference side of the crimped part and a second ridgeline on the outer circumference side of the crimped part from the crimped part image P. and a ridgeline extraction unit 40 (edgeline extraction means) that extracts the width of the crimped part, and measures the interval between the first ridgeline and the second ridgeline as the band width of the crimped part over the entire circumference of the crimped part to obtain band width data. It includes a band width measurement section 41 (band width measurement means) and a determination section 43 (determination means) that determines whether or not there is an abnormality in the crimping section based on the band width data. [Selection diagram] Figure 5

Description

The present disclosure discloses a detection device, a detection system, a detection method, and a detection system for detecting an abnormality in a crimped portion formed by crimping a cap into an opening formed in a metal plate member such as a top plate member of a metal can. Regarding programs and recording media.

Generally, a top plate member of a metal can that stores liquid such as fuel, solvent, oil, etc. is provided with a spout for pouring out the liquid contained therein. The spout is formed, for example, by a cylindrical mouthpiece that is crimped and attached to a circular opening formed in the top plate member. If the cap is not properly crimped to the top plate member, there is a risk that liquid may leak from the crimped portion. Therefore, in order to detect poor crimping as an abnormality in the crimped portion, a detection method as described in Patent Document 1, for example, has been proposed.

Japanese Patent Application Publication No. 2013-088120

The conventional detection method described above cuts out the ridge lines R1 and R2 on both the inner and outer sides of the caulked part, and when the areas Z1 and Z2 surrounded by each ridge line and the approximate perfect circle are equal to or larger than a predetermined determination reference area, It is determined that caulking is insufficient (see FIG. 8 in Patent Document 1).

However, in such a method, even if the crimped part bulges or collapses due to some abnormality, if the area of regions Z1 and Z2 is less than the predetermined judgment reference area, the crimped part is actually There has been a problem in that it may be erroneously determined that there is no abnormality in the crimping part even though the crimping is poor and there is an abnormality in the crimping part.

The present disclosure has been made to solve the above conventional problems, and provides a detection device, a detection system, a detection method, a detection program, and a recording medium that can accurately detect abnormalities in a caulked part. The purpose is to

In order to achieve the above object, the detection device disclosed herein detects an abnormality in an annular crimped portion formed by crimping a cylindrical mouthpiece into a circular opening formed in a metal plate member. The detection device includes: an image acquisition unit that acquires a crimped part image from an imaging device that images the crimped part; and an inner circumference of the crimped part from the crimped part image acquired by the image acquisition unit. ridge line extraction means for extracting a first ridge line on the side and a second ridge line on the outer circumferential side of the crimped part; a band width measuring means for obtaining band width data by measuring the band width of the crimped part over the entire circumference of the crimped part; The present invention is characterized by comprising a determining means for determining the presence or absence of an abnormality.

Another detection device disclosed in this specification is a detection device that detects an abnormality in an annular crimped portion formed by crimping a cylindrical cap into a circular opening formed in a metal plate member. an image acquisition unit that acquires a crimped part image from an imaging device that images the crimped part; and a first ridge line on the inner circumferential side of the crimped part from the crimped part image acquired by the image acquisition unit. and a second ridgeline on the outer peripheral side of the crimped part, and a third ridgeline that is between the first and second ridgelines and surrounds a predetermined unevenness on the crimped part; The difference between the interval between the first ridgeline and the second ridgeline extracted by the extraction means and the width of the area surrounded by the third ridgeline is defined as the band width of the crimped part, and the entire circumference of the crimped part is a belt width measuring means for measuring across the belt width to obtain belt width data; and a determining means for determining whether or not there is an abnormality in the swaging portion based on the belt width data obtained by the belt width measuring means. It is characterized by this.

In the detection device, the determining means may determine that there is an abnormality in the crimped portion when a difference between a maximum value and a minimum value of the band width in the band width data exceeds a predetermined difference.

In the detection device, the determining means may determine that there is an abnormality in the caulking portion when the maximum value of the band width in the band width data exceeds a predetermined value.

The detection device further includes change amount calculation means for calculating the amount of change in the band width in the band width data obtained by the band width measuring means to obtain change amount data, and the determining means is configured to calculate the amount of change in the band width in the band width data obtained by the band width measuring means. The presence or absence of an abnormality in the caulking portion may be determined based on the change amount data obtained by the calculation means.

The detection system disclosed in this specification includes the detection device and the imaging device.

The detection method disclosed in this specification is a detection method for detecting an abnormality in an annular crimped portion formed by crimping a cylindrical cap into a circular opening formed in a metal plate member, an image acquisition step of acquiring a crimped part image from an imaging device that images the crimped part; and a first ridge line on the inner peripheral side of the crimped part and the a ridgeline extraction step of extracting a second ridgeline on the outer circumferential side of the crimped portion; and a step of extracting a second ridgeline on the outer circumferential side of the crimped portion; a band width measurement step of measuring the entire circumference of the tightening portion to obtain band width data; and a determination of determining whether or not there is an abnormality in the tightening portion based on the band width data obtained in the band width measurement step. It is characterized by comprising a step.

The detection program disclosed in this specification is characterized by causing a computer to execute the detection method.

The recording medium disclosed in this specification is characterized in that the detection program is recorded thereon.

According to the present disclosure, abnormalities in the caulked portion can be detected with high accuracy.

1 is a schematic diagram of a detection system in Embodiment 1. FIG. It is a perspective view showing an example of a metal can. It is a sectional view showing an example of a caulking part. It is a figure which shows an example of a caulking part image. FIG. 2 is a block diagram showing an example of the configuration of a detection device. It is a flow chart which shows an example of a processing procedure by a detection device. 3 is a flowchart illustrating an example of a processing procedure by a determination unit. FIG. 3 is a diagram for explaining processing by an edge line extraction unit and a band width measurement unit in the first embodiment. It is a figure which shows an example of band width data when crimping of a crimping part is good. It is a figure which shows an example of band width data when crimping of a crimping part is defective. FIG. 7 is a diagram showing another example of band width data when the crimping portion is poorly crimped. It is a figure which shows an example of the amount of change data when crimping of a crimped part is good. It is a figure which shows an example of the amount-of-change data when crimping of a crimped part is defective. FIG. 7 is a diagram showing another example of change amount data when the crimping portion is poorly crimped. It is a figure which shows a part of other example of a caulking part image. FIG. 3 is a diagram for explaining processing by an edge line extraction unit and a band width measurement unit in the first embodiment.

Embodiments of the present disclosure will be described below with reference to the accompanying drawings. Note that the same components in each of the embodiments described below are given the same reference numerals, and overlapping explanations of these components will be omitted.

(Embodiment 1)
-Detection system-
FIG. 1 is a schematic diagram of a detection system 1 in Embodiment 1. In FIG. 1, an arrow X indicates the conveyance direction of the conveyance line L. FIG. 2 is a perspective view showing an example of the metal can A. FIG. 3 is a sectional view showing an example of the caulking portion 93.

The detection system 1 is used, for example, in an inspection process that is a subsequent process of the manufacturing process of a metal plate member 90 used as the top plate member 11 of the metal can A (see FIG. 1).

The metal can A is, for example, a square can as shown in FIG. 2, and includes a square tube member 10 formed by joining both ends of a plate material with a seam 10a such as seam welding, and openings at both upper and lower ends of the square tube member 10. It is configured to include a top plate member 11 and a bottom plate member 12 that close the space. Note that the metal can A may be a pail can or the like, and the capacity and form of the metal can A are not limited.

The top plate member 11 of the metal can A is provided with a spout 13 for pouring out the liquid contained therein. The spout 13 is formed of a cylindrical mouthpiece 92 that is crimped and attached to a circular opening 91 formed in the top plate member 11 (metal plate member 90) (see FIG. 2). For example, as shown in FIG. 3, the cap 92 is configured by fitting a cap folded portion 92a formed by folding back the proximal peripheral edge of the cap 92 into an opening folded portion 91a formed by folding back the peripheral edge of the opening 91. By doing so, the opening 91 of the metal plate member 90 is crimped. A crimped portion 93 formed by crimping the cap 92 into the opening 91 of the metal plate member 90 has an annular shape.

Note that the cross-sectional view of the caulking portion 93 shown in FIG. 3 merely shows an example, and the manner in which the cap 92 is caulked to the opening 91 of the metal plate member 90 is not limited.

The detection system 1 detects an abnormality in the caulking part 93 in the metal plate member 90, and includes an imaging device 2 disposed on the conveyance line L, and a detection device 3 communicably connected to the imaging device 2. (See Figure 1). In this embodiment, the abnormality of the crimping portion 93 includes a crimping failure of the crimping portion 93. On the conveyance line L, a defective product discharge section 8 is provided which discharges metal plate members 90 in which an abnormality in the caulking portion 93 has been detected by the detection device 3 to the outside of the conveyance line L as a defective product. The defective product discharge section 8 is configured to include, for example, an air cylinder 80 that removes defective products from the conveyance line L, and a defective product storage box 81 that accommodates the defective products.

FIG. 4 is a diagram showing an example of a crimped portion image P.

The imaging device 2 is housed in a light-shielding imaging box 2b together with an imaging illumination 2a. The imaging device 2 is configured with a still camera, a video camera, etc., and images the caulking portion 93 of the metal plate member 90 transported into the imaging box 2b on the transport line L from the back side of the metal plate member 90. Then, the crimped portion image P, which is the captured image, is output to the detection device 3. By reflecting the light from the imaging illumination 2a, the caulking portion 93 appears brightly in the caulking portion image P as shown in FIG.

FIG. 5 is a block diagram showing an example of the configuration of the detection device 3. As shown in FIG.

The detection device 3 includes a processing section 4, a storage section 5, an input section 60 (obtaining section), an output section 61, and a display section 7 (see FIG. 5).

The processing unit 4 is realized by, for example, a CPU (Central Processing Unit). The processing section 4 includes an edge line extraction section 40 (edge line extraction means), a band width measurement section 41 (band width measurement means), a change amount calculation section 42 (change amount calculation means), and a determination section 43 (determination means). , (see Figure 5). Each of these units is a part of the program 50 stored in the storage unit 5, and executes processing by being read out under the control of the processing unit 4. Processing by each of these units will be described in detail later with reference to flowcharts.

The storage unit 5 is, for example, an EEPROM (Electrically Erasable Programmable Read-Only Memory), an EPROM (Erasable Programmable Read-Only Memory), or a PROM (Programmable Read-Only Memory). non-volatile memory such as grammable ROM), ROM (Read Only Memory), flash memory, and RAM This is realized by volatile memory such as (Random Access Memory). The storage unit 5 stores a program 50 as well as various data used for processing by the processing unit 4. The storage unit 5 also stores various data output by the processing unit 4.

The imaging device 2 is connected to the input section 60 . An air cylinder 80 is connected to the output section 61 via a controller 80a.

The display unit 7 includes, for example, a display 70 that displays various information such as the processing status of the processing unit 4, and a signal tower 71 that lights up when an abnormality in the crimping unit 93 is detected. (See Figure 1).

-Processing procedure by detection device-
Next, a processing procedure by the detection device 3 in this embodiment will be explained.

FIG. 6 is a flowchart showing an example of a processing procedure by the detection device 3. FIG. 7 is a flowchart illustrating an example of a processing procedure by the determination unit 43. FIG. 8 is a diagram for explaining processing by the edge line extraction unit 40 and band width measurement unit 41 in the first embodiment.

First, in step ST1 shown in FIG. 6, the detection device 3 uses the input unit 60 to acquire the crimped portion image P from the imaging device 2.

Next, in step ST2, the ridge line extraction unit 40 of the processing unit 4 performs a known edge enhancement process or the like on the crimped part image P acquired in step ST1, so that the crimped part image P becomes as shown in FIG. A first ridgeline E1 on the inner circumferential side of the caulking part 93 and a second ridgeline E2 on the outer circumferential side of the caulking part 93 are extracted. When the edge line extraction unit 40 extracts the first edge line E1 and the second edge line E2, the crimped part image P may be subjected to a binarization process, or the crimped part image P may be subjected to a brightness reversal process or a black and white inversion process. Processing may be performed.

FIG. 9 is a diagram showing an example of band width data W when the crimping portion 93 is properly crimped. FIG. 10 is a diagram showing an example of band width data W when the crimping portion 93 is poorly crimped. FIG. 11 is a diagram showing another example of the band width data W when the crimping of the crimping portion 93 is defective. 9 to 11, the horizontal axis indicates the angular position (phase) of the crimped portion 93 in the circumferential direction, and the vertical axis indicates the band width of the crimped portion 93.

Subsequently, in step ST3, the band width measurement unit 41 of the processing unit 4 determines the interval between the first ridgeline E1 and the second ridgeline E2 extracted by the ridgeline extraction unit 40 in step ST2 as the band width of the crimping unit 93. Measurement is performed over the entire circumference of the caulked portion 93.

For example, the band width measurement unit 41 measures the band width of the crimped portion 93 as follows. As shown in FIG. 8, the band width measurement unit 41 identifies the center O (O) of the crimped part 93 from the crimped part image P, and draws a reference line RL from the center O in the radial direction of the crimped part 93. Then, the band width measurement unit 41 calculates the distance between the first intersection P1 and the second intersection P2 where the virtual line VL extending from the center O in the radial direction of the caulking part 93 intersects the first ridge line E1 and the second ridge line E2, respectively. D is measured as the band width, and the relationship between the angle θ formed by the virtual line VL and the reference line RL and the band width is obtained as band width data W as shown in FIGS. 9 to 11. The angle θ formed by the virtual line VL and the reference line RL corresponds to the angular position (phase) of the caulking portion 93 in the circumferential direction.

FIG. 12 is a diagram showing an example of change amount data V when the crimping portion 93 is properly crimped. FIG. 13 is a diagram showing an example of change amount data V when the crimping of the crimping portion 93 is defective. FIG. 14 is a diagram showing another example of the change amount data V when the crimping of the crimping portion 93 is defective. 12 to 14, the horizontal axis indicates the angular position (phase) of the crimped portion 93 in the circumferential direction, and the vertical axis indicates the amount of change in band width of the crimped portion 93.

Further, in step ST4, the change amount calculation section 42 of the processing section 4 calculates the amount of change in band width (band width change amount) in the band width data W obtained by the band width measurement section 41 in step ST3. The change amount calculation unit 42 calculates, for example, the angular position (phase) of the caulking portion 93 in the circumferential direction, and ΔY/ΔX, which is the band width change amount ΔY with respect to the phase change amount ΔX as shown in FIGS. 9 to 11. The relationship with the absolute value is obtained as change amount data V as shown in FIGS. 12 to 14. The change amount data V is similar to the linear differential of the curve represented by the band width data W and expressed as an absolute value. Note that the method for calculating the amount of change in band width (amount of change in band width) in the band width data W is not limited to the above.

Then, in step ST5, the determination unit 43 of the processing unit 4 compares the band width data W obtained by the band width measurement unit 41 in step ST3 with the change amount data V obtained by the change amount calculation unit 42 in step ST4. Based on this, it is determined whether or not there is an abnormality in the caulking portion 93. An example of processing by the determination unit 43 will be described using the flowchart of FIG. 7.

In step ST50, the determination unit 43 compares the maximum band width value W1 in the band width data W with a predetermined threshold value T1. The threshold value T1 is, for example, approximately 110% of the design dimension of the band width of the caulking portion 93.

When the crimping part 93 is properly crimped, the band width is approximately equal over the entire circumference of the crimping part 93, so as shown in FIG. Become. In this case, the determination unit 43 proceeds to the next step ST51.

On the other hand, if the crimping of the crimping portion 93 is defective, the maximum value W1 of the band width may exceed the threshold value T1, as shown in FIG. This is caused by bulging of the caulking part 93 as a result of improper caulking due to abnormalities such as swallowing of foreign objects, insufficient deformation of the cap 92 or opening 91, or defective materials. This is because the band width of the portion 93 becomes excessively large. Therefore, when the maximum value W1 exceeds the threshold value T1, the determining unit 43 proceeds to step ST53 and determines that there is an abnormality in the crimping unit 93.

Subsequently, in step ST51, the determination unit 43 compares the difference ΔW between the maximum value W1 and the minimum value W2 of the band width in the band width data W with a predetermined difference threshold (not shown). The difference threshold value is, for example, about 30% of the design dimension of the band width of the caulking portion 93.

When the caulking of the caulking portion 93 is good, the band width is generally uniform over the entire circumference of the caulking portion 93, so that the difference ΔW is equal to or less than the difference threshold value. In this case, the determination unit 43 proceeds to the next step ST52.

On the other hand, if the caulking of the caulking portion 93 is defective, the difference ΔW may exceed the difference threshold. This is because the crimping part 93 bulges or collapses as a result of improper crimping due to abnormalities such as swallowing of foreign objects, insufficient deformation of the cap 92 or opening 91, or defective materials. This is because the band width of the caulking portion 93 becomes excessively large or small. Therefore, when the difference ΔW between the maximum value W1 and the minimum value W2 exceeds the difference threshold, the determination unit 43 proceeds to step ST53 and determines that there is an abnormality in the crimping unit 93.

Further, in step ST52, the determination unit 43 compares the degree of variation in the bandwidth change amount in the change amount data V with a predetermined condition. The determination unit 43 extracts, as comparison targets, the increased change portions α1 to α4, for example, as shown in FIG. If any of the widths β1 to β4 exceeds a predetermined phase width threshold (not shown), it is determined that the fluctuation in the amount of change in band width is large. The change amount threshold T2 is, for example, about 15% of the design dimension of the band width of the caulking portion 93, and the phase width threshold is, for example, about 4 to 20 degrees. If the increased variation portions α1 to α4 appear but all of the phase widths β1 to β4 are equal to or less than the phase width threshold, the determination unit 43 determines that the increased variation portions α1 to α4 are noise in the bandwidth data W. It is determined that the fluctuation in the amount of band width change is small.

When the swaging portion 93 is well swaged, the band width is approximately equal over the entire circumference of the swaging portion 93, and therefore, as shown in FIG. 12, for example, the value of the band width variation is It becomes below the threshold value T2. In this case, in step ST52, the determination unit 43 determines that the variation in the band width change amount is small. The determining unit 43 proceeds to step ST54, and determines that there is no abnormality in the crimping unit 93 as a result of the processing in steps ST50 to ST52.

On the other hand, if the crimping of the crimping portion 93 is defective, as shown in FIG. 14, for example, increased variation portions α1 to α4 appear, and the phase width α2, α4 may exceed the phase width threshold. This is because the caulking is not performed properly due to abnormalities such as swallowing of foreign objects, insufficient deformation of the cap 92 or the opening 91, or defective materials, resulting in local bulges or depressions of the caulking portion 93. This is because the amount of change in band width fluctuates excessively. In this case, in step ST52, the determination unit 43 determines that the variation in the band width change amount is large. Therefore, when the determining section 43 determines that the variation in the amount of change in band width is large, the process proceeds to step ST53 and determines that there is an abnormality in the crimping section 93.

If the determining unit 43 of the processing unit 4 determines that there is an abnormality in the crimping part 93 in step ST5, in a step not shown, the detection device 3 detects the crimping part 93 from the output part 61 to the air cylinder 80. An instruction is given to remove the defective product for which an abnormality has been detected from the transport line L, and the signal tower 71 of the display section 7 is turned on.

In this way, the detection device 3 determines whether or not there is an abnormality in the crimping part 93 by using the determination unit 43 of the processing unit 4 to determine whether or not there is an abnormality in the crimping part 93 based on the band width data W and the change amount data V. Detect.

Since the detection device 3 described above detects the bulge or depression of the swaging portion 93 that occurs as a result of poor swaging, based on the band width data W and the amount of change data V, it is possible to Abnormalities in the caulking portion 93, including caulking defects in the caulking portion 93, can be detected with high accuracy.

Note that the various threshold values of the threshold value T1, the difference threshold value, the amount of change threshold value T2, and the phase width threshold value are not limited to the settings described above. It may also be set based on the workpiece of the plate member 90. Further, various threshold values can also be used to detect contamination of products of different types, different lots, etc.

In addition, in step ST5 shown in FIG. 6, the determination unit 43 of the processing unit 4 simply determines whether or not there is an abnormality in the crimping unit 93 based on the band width data W obtained by the band width measurement unit 41 in step ST3. You may. Even in such a case, the bulge or depression of the crimped part 93 that occurs as a result of poor crimping is detected based on the band width data W, so the crimping of the crimped part 93 can be The above-mentioned effect of being able to accurately detect abnormalities in the caulking portion 93 including poor tightening remains unchanged.

For example, in step ST51 shown in FIG. 7, when the difference ΔW in the band width data W is less than or equal to the difference threshold, the determination unit 43 may proceed to step ST54 and determine that there is no abnormality in the crimping unit 93. Alternatively, in step ST50 shown in FIG. 7, the determining unit 43 may proceed to step ST54 when the maximum band width value W1 is equal to or less than the threshold value T1, and determine that there is no abnormality in the crimping portion 93.

As in step ST52 above, the determining unit 43 determines whether or not there is an abnormality in the crimping unit 93 based on the change amount data V, so that, for example, the maximum value W1 of the band width is set to the threshold T1 as shown in FIG. Even if the difference ΔW is below the difference threshold and there is no abnormality in the crimped part 93 at first glance, the crimped part 93 may be damaged due to poor crimping. A local bulge or depression is detected based on the change amount data V. Thereby, abnormalities in the caulking part 93, including failure of caulking in the caulking part 93, can be detected with higher accuracy.

(Embodiment 2)
Hereinafter, regarding the second embodiment, only the points different from the first embodiment described above will be described. In the second embodiment, the abnormality of the caulking portion 93 includes a caulking failure of the caulking portion 93 and an appearance defect of the caulking portion 93 such as a dent, dirt, or scratch on the caulking portion 93.

FIG. 15 is a diagram showing a part of another example of the crimping part image P. FIG. 16 is a diagram for explaining processing by the edge line extraction unit 40 and band width measurement unit 41 in the second embodiment.

In the second embodiment, the processes in step ST2 and step ST3 shown in FIG. 6 are different from those in the first embodiment as described below.

In step ST2, the ridge line extraction unit 40 of the processing unit 4 of the detection device 3 performs a known edge enhancement process or the like on the crimped part image P acquired in step ST1 to create a crimped part image as shown in FIG. In addition to the first ridgeline E1 on the inner circumference side of the caulking part 93 and the second ridgeline E2 on the outer circumference side of the caulking part 93 from P, the area between the first ridgeline E1 and the second ridgeline E2 and the caulking part A third ridge line E3 surrounding a predetermined unevenness on 93 is extracted. The predetermined unevenness is, for example, an unevenness U in which a strong contrast (difference between brightness and darkness) appears in the crimped part image P with respect to the surrounding area due to dents, dirt, scratches, etc. on the crimped part 93, as shown in FIG. It is uneven like this.

Note that the number of third ridge lines E3 is not limited to one, and a plurality of third ridge lines E3 may be extracted depending on the number of dents, stains, scratches, etc. on the caulking portion 93.

In step ST3, the band width measurement unit 41 calculates the difference between the interval between the first ridgeline E1 and the second ridgeline E2 extracted by the ridgeline extraction unit 40 in step ST2 and the width of the region R surrounded by the third ridgeline E3. is the band width of the crimped part 93 and is measured over the entire circumference of the crimped part 93.

For example, as shown in FIG. 8, the band width measuring unit 41 is configured to measure the area where the virtual line VL intersects the first intersection P1 and the second intersection P2, where the virtual line VL intersects the first ridgeline E1 and the second ridgeline E2, respectively. A plurality of third intersections P3 (in the example shown in FIG. 16, two third intersections P31 and P32) that intersect with the third ridgeline E3 are specified. Then, the band width measurement unit 41 measures the sum of the distance D1 between the first intersection P1 and the third intersection P31 and the distance D2 between the third intersection P32 and the second intersection P2 as the band width, and calculates the sum of the distance D1 between the first intersection P1 and the third intersection P31 and the distance D2 between the third intersection P32 and the second intersection P2. The relationship between the angle θ formed by the reference line RL and the band width is obtained as band width data W.

The sum of the distance D1 and the distance D2 is equivalent to the difference between the distance D between the first intersection P1 and the second intersection P2 and the width Wr in the direction along the virtual line VL in the region R surrounded by the third ridgeline E3. It is. That is, the band width measurement unit 41 in the second embodiment subtracts the width of the predetermined unevenness represented by the region R from the band width measured by the band width measurement unit 41 in the first embodiment, and measures the band width. do. Therefore, the band width of the crimped portion 93 in the second embodiment becomes excessively small due to the appearance defect of the crimped portion 93. If the appearance of the crimped portion 93 is poor, the difference ΔW in the band width data W may exceed the difference threshold, and the variation in the band width change amount in the change amount data V may become large.

Therefore, in step ST5, the determination unit 43 of the processing unit 4 compares the band width data W obtained by the band width measurement unit 41 in step ST3 with the change amount data V obtained by the change amount calculation unit 42 in step ST4. Based on this, it is determined whether there is any abnormality in the crimping part 93, including poor crimping of the crimping part 93 and poor appearance. Note that the contents of the processing in step ST5 and steps ST50 to ST54 are the same as those in the first embodiment.

Note that when a plurality of third ridgelines E3 are extracted in step ST2, the "width of the region R surrounded by the third ridgeline E3" is defined as the width of the region R surrounded by the third ridgeline E3 along the virtual line VL. It may be the sum of the widths in each direction.

The above-mentioned detection device 3 detects the bulge or depression of the crimped portion 93 resulting from improper crimping and the appearance defect of the crimped portion 93 by detecting the band width data W and the change amount data. Since it is comprehensively detected based on V, it is possible to accurately detect abnormalities in the caulking part 93, including not only poor caulking of the caulking part 93 but also defects in appearance.

In addition, in step ST5 shown in FIG. 6, the determination unit 43 of the processing unit 4 simply determines whether or not there is an abnormality in the crimping unit 93 based on the band width data W obtained by the band width measurement unit 41 in step ST3. You may. Even in such a case, the bulge or depression of the crimped part 93 that occurs as a result of improper crimping and the poor appearance of the crimped part 93 can be comprehensively considered based on the band width data W. Therefore, there is no change in the above-mentioned effect that abnormalities of the caulking part 93 including not only defective caulking of the caulking part 93 but also defective appearance can be detected with high accuracy.

The above embodiments and examples are illustrative in all respects and are not the basis for restrictive interpretation. Therefore, the technical scope of the present disclosure should not be interpreted only by the above-described embodiments and examples, but should be defined based on the claims. In addition, all changes within the meaning and scope of equivalents to the scope of the claims are included.

A Metal can 10 Square cylinder member 11 Top plate member 12 Bottom plate member 13 Spout 90 Metal plate member 91 Opening 92 Cap 93 Clamping unit 1 Detection system 2 Imaging device 3 Detection device 4 Processing unit 40 Edge line extraction unit (ridge line extraction means)
41 Band width measurement unit (band width measurement means)
42 Change amount calculation unit (change amount calculation means)
43 Judgment unit (judgment means)
5 Storage unit 60 Input unit (image acquisition means)
61 Output section 7 Display section 8 Defective product discharge section E1 First ridgeline E2 Second ridgeline P Clinching section image V Change amount data W Band width data W1 Maximum value W2 Minimum value

Claims (8)

A detection device for detecting an abnormality in an annular crimped portion formed by crimping a cylindrical cap into a circular opening formed in a metal plate member,
image acquisition means for acquiring a crimped part image from an imaging device that images the crimped part;
From the crimped part image acquired by the image acquisition means, a first ridge line on the inner peripheral side of the crimped part, a second ridge line on the outer peripheral side of the crimped part, and between the first and second ridge lines. ridgeline extraction means for extracting a third ridgeline surrounding a predetermined unevenness on the caulked portion;
The difference between the interval between the first ridge line and the second ridge line extracted by the ridge line extracting means and the width of the area surrounded by the third ridge line is defined as the band width of the crimped part, and the entire width of the crimped part is a band width measuring means for obtaining band width data by measuring over the circumference;
A detection device comprising: determination means for determining whether or not there is an abnormality in the caulking portion based on the belt width data obtained by the belt width measurement means. The detection device according to claim 1 ,
The determining means is
A detection device characterized in that, when a difference between a maximum value and a minimum value of the band width in the band width data exceeds a predetermined difference, it is determined that there is an abnormality in the crimped portion. 3. The detection device according to claim 2 ,
The determining means is
A detection device characterized in that it is determined that there is an abnormality in the caulking portion when the maximum value of the band width in the band width data exceeds a predetermined value. 3. The detection device according to claim 2 ,
Further comprising a change amount calculation means for calculating the amount of change in the band width in the band width data obtained by the band width measurement means to obtain change amount data,
The determining means is
A detection device characterized by determining whether or not there is an abnormality in the caulking portion based on the change amount data obtained by the change amount calculation means. A detection system comprising the detection device according to claim 1 and the imaging device. A detection method for detecting an abnormality in an annular crimped portion formed by crimping a cylindrical cap into a circular opening formed in a metal plate member, the method comprising:
an image acquisition step of acquiring a crimped part image from an imaging device that images the crimped part;
From the crimped part image acquired in the image acquisition step, a first ridge line on the inner circumferential side of the crimped part, a second ridge line on the outer periphery side of the crimped part, and between the first and second ridge lines. a ridgeline extraction step of extracting a third ridgeline surrounding a predetermined unevenness on the caulked portion ;
The difference between the interval between the first ridge line and the second ridge line extracted in the ridge line extraction step and the width of the area surrounded by the third ridge line is defined as the band width of the crimped part, and the entire width of the crimped part is a band width measurement step of obtaining band width data by measuring over the circumference;
A detection method comprising: a determining step of determining whether or not there is an abnormality in the caulking portion based on the band width data obtained in the band width measuring step. A detection program that causes a computer to execute the detection method according to claim 6 . A recording medium on which the detection program according to claim 7 is recorded.

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