JP4001754B2 - Measuring method for bottle cans - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a measuring method for a bottle can that measures dimensions of each part of the bottle can.
[0002]
[Prior art]
In recent years, bottle cans made of aluminum alloys and the like have become widespread as containers filled with soft drinks and the like, in addition to PET bottles. This bottle can is composed of a large-diameter barrel portion and a small-diameter base portion formed at the upper end portion of the barrel portion. A screw portion is formed in the base portion, and a cap is screwed onto the screw portion. It becomes the composition which is done.
Usually, this bottle can is processed by drawing and ironing an aluminum alloy formed in a disk shape, forming a bottomed cylindrical can body, necking in the upper end of this can body, It is manufactured by forming the base part while narrowing down to the base part, and further forming the screw part in the base part.
[0003]
In the manufacturing process of this bottle can, it is necessary to confirm whether or not the dimensions of each part of the bottle can to be manufactured meet the specifications. In particular, since the cap is attached and fixed to the base part of the bottle can, the dimensional accuracy of each part of the base part is important.
Conventionally, as a means for performing the measurement, a measuring contact is brought into contact with each part of the bottle can, and each part is measured by detecting contact, non-contact or displacement of the contact. Met.
[0004]
[Problems to be solved by the invention]
By the way, in the above conventional measurement method, the contact for measurement is physically brought into contact with the bottle can. Therefore, when measuring a large number of measurement points, the measurement with the contact is repeated several times. Must be repeated, and it takes a long time to measure, and the measurement result cannot be obtained with high accuracy.
Furthermore, as described above, this bottle can is formed by initially drawing and ironing to form a bottomed cylindrical can body, and further, by forming the base portion by necking in the can body, Since it is generally manufactured by two processes, the axis of the can body and the axis of the base may be formed out of alignment. When measuring without taking this point into account, there was a problem that the dimensions of each part of the bottle can base could not be measured accurately.
[0005]
The present invention has been made in consideration of such circumstances, and an object of the present invention is to provide a method for measuring a bottle can that can measure each part of the bottle can with high accuracy and high speed.
[0006]
[Means for Solving the Problems]
In order to solve the above problems and achieve such an object, the present invention proposes the following means. The invention according to claim 1 is a measuring method for measuring the dimensions of each part of the bottle can, which captures the outline of the bottle can by capturing the bottle can with an imaging means , and opening the bottle can The top surface is captured as a reference measurement line, and the dimensions of each part of the bottle can are measured based on the contour line using the reference measurement line as a reference .
[0007]
According to the method for measuring a bottle can according to the present invention, since the dimensions of each part of the bottle can are measured based on the contour line imaged by the imaging unit, the physical contact of the bottle can is not given to the bottle can. High-accuracy measurement is made instantly. In addition, since the top surface of the opening of the bottle can is used as a reference measurement line, even when the axis of the base part is deviated from the axis of the body part, which is peculiar to the bottle can, the measurement at each part of the base part is extremely high. Made to accuracy.
[0008]
According to a second aspect of the present invention, in the method for measuring a bottle can according to the first aspect , the top surface of the opening is a base formed by neck-in processing at an upper end of a body portion formed by drawing and ironing. The upper edge of the portion is characterized in that
According to the measurement method of the bottle can according to the present invention, since the top surface of the opening of the bottle can is used as a reference measurement line, the body is formed by drawing and ironing , which is peculiar to the bottle can. Since the base part is formed by processing, even when the axis of the base part is shifted from the axis of the body part in both processings, measurement at each part of the base part is performed with extremely high accuracy.
[0010]
According to a third aspect of the present invention, in the method for measuring a bottle can according to the first or second aspect, the image signal obtained by the imaging unit is configured to set a part of the image signal, and in the image signal A change in signal intensity is detected, and a portion due to the change in signal intensity is detected as an outline of the bottle can.
According to the bottle can measuring method according to the present invention, since the contour line of the bottle can is detected based on the change in the signal intensity of the image signal, the contour line can be detected with high accuracy. Measurement is made with high accuracy.
[0012]
According to a fourth aspect of the present invention, in the method for measuring a bottle can according to the third aspect, a region of one part of the image signal is set, a contour line of the one part is detected, and a second part of the image signal is detected. The region is set, the contour line of the two portions is detected, and the intersection of the extension lines of the contour line of the one portion and the contour line of the two portions is used as a measurement point. .
[0013]
According to the measurement method of the bottle can according to the present invention, since the intersection of the contour line of one part and the contour line of the second part is a measurement point, the measurement standard becomes clear and the measurement of a fine part is possible. It becomes possible.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. 1 to 20 show an embodiment of the present invention. 1 and 2 show a schematic configuration of an apparatus for carrying out a bottle can measuring method according to the present invention.
In these drawings, reference numeral 1 is a bottle can to be measured, and reference numeral 2 is a measuring device.
[0019]
As shown in FIG. 6, the bottle can 1 includes a large-diameter body part 20, a shoulder part 21 that gradually decreases in diameter from the upper end of the body part 20 upward, and a body part 20 formed at the upper end of the shoulder part 21. It is mainly composed of a small-diameter base portion 22. A screw part 23, a skirt part 24, and a bulging part 26 are formed on the outer peripheral part of the base part 22, and a curled part 25 that is an upper end edge part of the bottle can 1 is folded at the upper end part of the base part 22. Is formed. The inside of the curled portion 25 is open, and the upper edge of the curled portion 25 is hereinafter referred to as an opening top surface.
Here, the skirt portion 24 is a portion to which the temper evidence portion 31 of the cap 30 is attached. That is, the cap 30 attached to the cap portion 23 of the bottle can 1 includes a cap main body 32 that is screwed by closing the top surface of the opening of the bottle can 1, and a breaking portion 33 at the lower end portion of the cap main body 32. The temper evidence part 31 is provided and connected and formed, and the temper evidence part 31 is locked by the skirt part 24.
Further, as shown in FIG. 20, a portion 27 where the screw width a starts to be clearly formed in the upper portion of the screw portion 23 is hereinafter referred to as a screw start.
[0020]
1 and 2, the measuring apparatus 2 includes a table 50 that holds the bottle can 1, a camera 51 that is disposed above the bottle can 1, and cameras 52 and 53 that are disposed outside the side surface of the bottle can 1. And illumination devices 54, 55, 56 provided corresponding to the cameras 51, 52, 53, and a control unit 57 that controls each of the above components. The table 50 includes a lifting table 58 that moves the bottle can 1 in the vertical direction, and a rotary table 59 that rotates the bottle can 1 around its axis.
[0021]
The illumination device 54 is formed in an annular shape and is provided below the camera 51. The camera 51 is configured to be able to image the bottle can 1 from above through the interior of the illumination device 54. The illumination devices 55 and 56 are provided so as to face the cameras 52 and 53 with the bottle can 1 interposed therebetween. At this time, the cameras 52 and 53 are arranged at positions separated by 120 ° around the rotation axis of the measurement table 50.
In this case, the camera 52 is arranged so as to be able to take an image of the bottle can 1, particularly the base 22, and the camera 53 takes an image of the shoulder 21 from the upper part of the body 20 of the bottle can 1. It is arranged to be able to. The camera 52 is disposed near the bottle can 1 with respect to the bottle can 1, and the camera 53 is disposed away from the bottle can 1 from the camera 52.
[0022]
As shown in FIGS. 1 and 2, the bottle can 1 placed on the table 50 is configured to be imaged simultaneously by the cameras 51, 52, and 53. After completion of the measurement by the imaging, the bottle can 1 is rotated by 120 ° around its axis, measured in the same manner, and the bottle can 1 is rotated about 240 degrees around the axis about three places on the circumference of the bottle can 1. The measurement items described below are measured.
[0023]
In this embodiment, 14 items shown in FIG. 5 are measured. That is, the total length of the can, neck length, skirt length, curl width, thread height, curl inner diameter and roundness, curl outer diameter, thread outer diameter, skirt outer diameter, skirt valley diameter, skirt angle, screw start height The neck length. Among these measurement items, the measurement of the curl inner diameter and roundness is performed by the camera 51, and the can total length, neck length, skirt length, curl width, thread height, curl outer diameter, thread outer diameter, skirt outer The diameter, skirt valley diameter, skirt angle, screw start height are measured by the camera 52, and the neck length is measured by the camera 53.
[0024]
These measurements are performed by imaging three points on the circumference of the bottle can 1 with the cameras 51, 52, and 53 as shown in FIG. 3 and processing these imaging results in the control unit 57. It is. That is, the outline of the bottle can 1 is captured from the imaging result, and the dimensions of each part of the bottle can 1 are measured based on the outline. In addition, this measurement method mainly captures the top surface of the opening of the bottle can 1 as a reference measurement line, and measures the reference measurement line as a reference.
[0025]
In the measuring apparatus 2 configured as described above, as shown in FIG. 3, the bottle can 1 placed on the table 50 is first measured at the measurement point of the bottle can 1 by the camera 51 on the upper surface of the bottle can 1. 1 is imaged simultaneously by the camera 52 and the measurement point 3 of the bottle can 1 is imaged by the camera 53 simultaneously. After the measurement is completed, the bottle can 1 is rotated 120 ° clockwise around its axis by the table 59, and the measurement point 1 of the bottle can 1 is simultaneously imaged by the camera 53 and the measurement point 2 of the bottle can 1 by the camera 52. After the measurement is completed, the bottle can 1 is further rotated clockwise by 120 ° about its axis, and the measurement point 3 of the bottle can 1 is simultaneously imaged by the camera 52 and the measurement point 2 of the bottle can 1 is imaged by the camera 53 simultaneously. As a result, all of the above measurements are made at three locations on the circumference of the bottle can 1. Here, among the above measurement items, the screw start height is only present at one place on the circumference of the bottle can 1, and is thus measured only at the measurement point 1 when the rotation angle is 0 °.
The measurement of each part will be specifically described below.
[0026]
First, the bottle can 1 that has been positioned in the circumferential direction in advance by another device (not shown) is placed on the table 50. At this time, the bottle can 1 is disposed at a position where the screw start portion 27 is separated from the camera 52 by 90 °.
Then, reference coordinates are set for the image signal captured by the camera 52. Within this reference coordinate, the outline of the bottle can corresponding to the specification of the bottle can 1 to be measured is set on the coordinates. After setting in this way, the outline of the actual bottle can 1 is captured.
[0027]
[Measurement of total can length]
In this state, in the measurement of the can total length A, first, as shown in FIG. 6, a region W1 is set in the vicinity of the central axis of the bottle can 1 and in the vicinity of the top surface of the opening of the bottle can 1. In the region W1, image data of the top surface of the opening of the bottle can 1 is obtained by the device 2, and the reference measurement line L1 is set from the change in signal intensity of the image data. That is, in the apparatus 2, as shown in FIG. 1, since the illumination device 55 is located at a position facing the camera 52, the silhouette of the bottle can 1 appears in the light of the image signal obtained by the camera 52. It is an image signal. Accordingly, the reference measurement line L1 is obtained by detecting the change in the image signal intensity, that is, the change in luminance. The reference measurement line L1 is used as a reference in each measurement described later in addition to the can full length A.
In order to calculate the can total length A from the reference measurement line L1, first, a vertical line L2 is drawn to a position slightly inward from the left end P0 of the top of the opening of the bottle can 1, and then the reference measurement line L1 and the vertical line L2 are drawn. The Y coordinate value of the intersection P1 is measured. The difference between the Y coordinate value at this time and the reference Y coordinate value corresponding to the height that matches the specification of the bottle can 1 is calculated, and the calculation result is added to the reference dimension corresponding to the specification of the bottle can 1. To calculate the total length A.
[0028]
According to this measurement method, since an image is obtained by imaging with the camera 52 and measurement is performed, the measurement can be performed with higher accuracy and in a shorter time than the measurement method in which the probe is physically brought into contact with the bottle can 1. Is possible. Further, since the screw start is used as a reference, the measurement reference is clear and high-precision measurement can always be performed.
[0029]
Hereinafter, the base part 22 of the bottle can 1 and each part in the vicinity thereof are measured, but the axis of the bottle can 1 is aligned before that. That is, as described above, the bottle can 1 is initially formed by drawing and ironing to form the barrel portion 20 and then by neck-in processing to form the base portion 22. There is a case where the axis of the base part 22 is displaced, and there is a problem that an appropriate measurement result cannot be obtained if the base part 22 and its vicinity are measured in this shifted state.
[0030]
In order to solve this problem, in the following measurement, the measurement is performed using the top of the opening, that is, the reference measurement line L1 as a reference. That is, as shown in FIGS. 7A and 7B, the coordinate setting is changed, the reference measurement line L1 is set as the horizontal coordinate, and the axis M of the bottle can 1 cap portion 22 is set as the vertical coordinate.
[0031]
[Measurement of neck length]
The neck length B is measured by the camera 53. First, as shown in FIG. 8, in the same manner as the method for obtaining the reference measurement line L1 described above, a region W2 is set in the shoulder portion 21, and the tangent line of this contour line is extended with the brightness change portion as the contour line. To identify L2. Further, similarly, an area W3 is set in the body 20 and L3 is specified. The intersection P2 between the L2 and L3 is set as the intersection between the shoulder 21 and the trunk 20, and the neck length B is calculated from the difference between the Y coordinate values of the L1 and P2.
[0032]
[Measure the neck length]
The neck length C is measured by the camera 52. As shown in FIG. 9, first, a region W <b> 5 is set in the bulging portion 26, and a region W <b> 6 is set in the curved portion at the upper end of the shoulder portion 21. Within these regions W5 and W6, the changed portion of the image signal is defined as the contour line, and the extension lines L4 and L5 of the contour line are obtained, and the intersection of these L4 and L5 is defined as P3. The difference between the Y coordinate values of L1 and P3 is calculated to calculate the neck length C.
[0033]
[Measure skirt height]
The skirt height D is measured by the camera 52. As shown in FIG. 10, first, an area W6 is set in the skirt portion 24, a change in the image signal, that is, a change in luminance is detected in the area W6, and the outline of the part is captured. The most projecting end portion, that is, the leftmost end P4 in FIG. 10 is specified. The difference between the Y coordinate values of L1 and P4 is calculated to calculate the skirt height D.
[0034]
[Measure curl width]
The curl width E is measured by the camera 52. As shown in FIG. 11, first, a region W7 is set in the curled portion, and a contour line is captured by a change portion of the image signal, that is, a change in luminance, in the region W7. The position, that is, the rightmost end P5 in FIG. 11 is specified. The difference between the Y coordinate values of L1 and P5 is calculated to calculate the curl width E.
[0035]
[Measurement of thread height]
The thread height F is measured by the camera 52. As shown in FIG. 12, first, a region W8 is set in the screw portion 23, a change in the image signal, that is, a change in luminance is detected, a contour line of this portion is captured, and a plurality of screws are included in the contour line. Of the peaks, the most outwardly protruding portion, that is, the leftmost end P6 ′ of the peaks P6 and P6 ′ in FIG. 12, is detected. Next, P7 'located in the innermost among a plurality of valleys is detected. And the difference of the X coordinate value of P6 'and P7' is calculated, and the thread height F is calculated.
[0036]
[Measurement of curl inner diameter and roundness]
As shown in FIG. 1, the inner diameter of the curled portion 25 of the base portion 22 is measured by taking an image of the bottle can 1 from above with a camera 51, and obtaining images of the top surface of the opening portion 25 shown in FIGS. obtain. In this image, while passing through the center line O of the bottle can 1, 64 horizontal lines 40, 41... Are set by shifting the position in the circumferential direction of the bottle can 1, and the inner diameter of the curled portion 25 on the plurality of horizontal lines. And the average of these inner diameters is taken as the inner diameter of the curled portion 25. The roundness is calculated by calculating the difference between the average value and the maximum value and the minimum value of the inner diameters obtained by the above measurement.
In this measurement example, the inner diameter of the curled portion 25 is measured, but the outer diameter of the curled portion 25 may be measured. Further, not only the base part 22 but also the diameter of each part such as the outer diameter of the body part 20 can be measured in the same manner.
[0037]
[Measurement of curled part outer diameter]
The measurement of the outer diameter G of the curled portion 25 is performed by the camera 52. In the same manner as described above, as shown in FIG. 14, areas W9 and W10 are set at one end and the other end of the curled portion 25, respectively, and the contour lines are captured in the areas W9 and W10, respectively. . The outer diameter G of the opening 25 is calculated from the X coordinate values of the leftmost end in the region W9 and the rightmost end in the region W10 on the contour line.
[0038]
[Measurement of thread outer diameter]
The thread outer diameter H is measured by the camera 52. In the same manner as described above, as shown in FIG. 15, regions W11 and W12 are set at one end and the other end of the screw portion 23, respectively, and contour lines are respectively compensated in the regions W11 and W12. Capture. In FIG. 15, the thread outer diameter H is calculated from the X coordinate values of the leftmost end P10 in the region W11 and the rightmost end P11 in the region W12 on the contour line.
[0039]
[Measurement of skirt outer diameter]
The skirt outer diameter I is measured by the camera 52. In the same manner as described above, as shown in FIG. 16, regions W13 and W14 are respectively set at one end and the other end of the skirt portion 24, and contour lines are respectively compensated in the regions W13 and W14. Capture. The bulging portion outer diameter I is calculated from the X coordinate values of the leftmost end P12 in the region W13 and the rightmost end P13 in the region W14 on the contour line.
[0040]
[Measurement of skirt valley diameter]
The skirt valley diameter J is measured by the camera 52. Similarly to the above, as shown in FIG. 17, areas W15 and W16 are respectively set at one end and the other end of the skirt valley portion 28, and contour lines are respectively set in the areas W15 and W16. Capture. The skirt valley diameter J is calculated from the X coordinate values of the rightmost end P14 in the region W15 and the leftmost end P15 in the region W16 on the contour line.
[0041]
[Measure skirt angle]
The skirt angle θ is measured by the camera 52. In the same manner as described above, as shown in FIG. 18, a region W17 is set on the lower end side of the skirt portion 24, and a contour line is captured in the region W17. An extension line L6 of the tangent line of the contour line is set, and the angle formed by L1 and L6 is calculated as the skirt angle θ.
[0042]
[Measurement of screw start height]
The screw start height K is measured by the camera 52. Similarly to the above, as shown in FIG. 19, a region W18 is set in the vicinity of the screw start portion 27, and the contour line is captured in the region W18. The screw start height K is calculated from the Y-coordinate value of the most protruding end portion in the region W18 on the contour line, that is, the leftmost end P14 in FIG.
[0043]
【The invention's effect】
As is apparent from the above description, according to the invention according to claim 1, in order to measure the dimensions of each part of the bottle can based on the contour line imaged by the imaging means, the physical contact of the bottle can It becomes possible to carry out highly accurate measurement instantaneously without providing the above. In addition, since the top surface of the opening of the bottle can is used as a reference measurement line, even when the axis of the base part is deviated from the axis of the body part, which is peculiar to the bottle can, measurement at each part of the base part is particularly accurate. Can be implemented.
[0044]
According to the invention according to claim 2, in order to use the top surface of the opening of the bottle can as a reference measurement line, the body is formed by drawing and ironing unique to the bottle can , and then by neck-in processing, Since the base part is formed, even when the axis of the base part is deviated from the axis of the body part in both processes, it is possible to carry out measurement at each part of the base part with high accuracy.
[0045]
According to the invention according to claim 3, since the contour line of the bottle can is detected based on the change in the signal intensity of the image signal, the contour line can be detected with high accuracy. It becomes possible to carry out with high accuracy.
[0046]
According to the invention of claim 4, since the intersection of the contour line of one part and the contour line of the second part is used as a measurement point, the measurement reference becomes clear and a fine part can be measured. .
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of a bottle can measuring device shown as an embodiment of the present invention, in which a main part is viewed from a side.
FIG. 2 is a schematic configuration diagram of the bottle can measuring apparatus of the embodiment shown in FIG.
FIG. 3 is an explanatory diagram showing a positional relationship of a camera and measurement positions.
FIG. 4 is an explanatory diagram showing measurement contents.
FIG. 5 is an explanatory diagram showing measurement items and measurement locations.
FIG. 6 is an explanatory diagram showing a method for measuring the total length of a bottle can.
FIG. 7 is an explanatory diagram when correcting the position of the bottle can on coordinates.
FIG. 8 is an explanatory diagram showing a method for measuring the neck length of a bottle can.
FIG. 9 is an explanatory diagram showing a method for measuring the neck length of a bottle can.
FIG. 10 is an explanatory diagram showing a method for measuring the skirt height of a bottle can.
FIG. 11 is an explanatory diagram showing a method for measuring the curl width of a bottle can.
FIG. 12 is an explanatory diagram showing a method for measuring the thread height of a bottle can.
FIG. 13 is an explanatory diagram showing a method for measuring the curl inner diameter of a bottle can.
FIG. 14 is an explanatory diagram showing a method for measuring the curl outer diameter of a bottle can.
FIG. 15 is an explanatory diagram showing a method for measuring the thread outer diameter of a bottle can.
FIG. 16 is an explanatory diagram showing a method of measuring the skirt outer diameter of the bottle can.
FIG. 17 is an explanatory diagram showing a method for measuring a skirt valley diameter of a bottle can.
FIG. 18 is an explanatory diagram showing a method for measuring the skirt angle of a bottle can.
FIG. 19 is an explanatory diagram showing a method for measuring the screw start height of a bottle can.
FIG. 20 is an explanatory view showing a screw start portion of the bottle can.
[Explanation of symbols]
1 Bottle cans 51, 52, 53 Camera (imaging means)
L1 Reference measurement lines 40, 41 Horizontal line 27 Screw start

Claims (4)

  A measuring method for measuring the dimensions of each part of the bottle can, which captures the outline of the bottle can by capturing the bottle can with an imaging means, and captures the top surface of the opening of the bottle can as a reference measurement line And measuring the dimensions of each part of the bottle can based on the contour line with the reference measurement line as a reference.   2. The bottle can measuring method according to claim 1, wherein the top surface of the opening is an upper edge of a base portion formed by neck-in processing at an upper end of a body portion formed by drawing and ironing. A method for measuring a bottle can characterized by the above.   In the bottle can measurement method according to claim 1 or 2, for the image signal obtained by the imaging means, a part of the image signal is set as a region, and a change in signal intensity in the image signal is detected, A method for measuring a bottle can, wherein a portion due to a change in the signal intensity is detected as an outline of the bottle can.   The method for measuring a bottle can according to claim 3, wherein one part of the image signal is set as an area, a contour line of the one part is detected, and two parts of the image signal are set as an area, A measuring method of a bottle can characterized in that a contour line of two parts is detected, and an intersection point of each extension line of the contour line of the one part and the contour line of the second part is used as a measurement point.

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