WO1988008970A1

WO1988008970A1 - Method of inspecting can seaming

Info

Publication number: WO1988008970A1
Application number: PCT/JP1988/000448
Authority: WO
Inventors: Kyuichi Shibazaki; Eiji Tsuda; Hideaki Honma
Original assignee: Toyo Seikan Kabushiki Kaisha; Softex Company Limited
Priority date: 1987-05-06
Filing date: 1988-05-06
Publication date: 1988-11-17
Also published as: GB2215834B; GB2215834A; GB8830046D0

Abstract

This invention relates to a method of inspecting can seaming comprising the steps of disposing a can to be inspected between an X-ray source and an X-ray data input means, radiating the X-rays to part of the seaming at a predetermined angle of inclination with respect to the flat surface of the can lid to obtain X-ray transmission data, disposing the X-ray source in the proximity of one of the ends of a diameter of the seaming and the X-ray data input means in the proximity of the other end to obtain the X-ray transmission data, applying the X-rays to the seaming in a tangential direction to obtain the X-ray transmission data on the section of the seaming on the basis of these data.

Description

Specification

Inspection method of can volume ^

Technical field

The present invention relates to a method for detecting a tightened portion of a metal can used as a canned container for food or the like.

Background technology

Metal cans used as cans for food etc. are formed of the can body, can lid, and can bottom. In the case of so-called three-piece cans, the can body has a can lid. And the bottom of the can, and in the case of a two-bead can in which the can body and the bottom are integrated, the can lid is wound around the can body. In addition, the cans are sealed. As will be described later (FIG. 2), the body of the can body and the can lid (hereinafter referred to as the “can lid” including the can bottom) have a body formed at the edge of the can body. The hook (BH) and the cover hook (CH) formed on the outer peripheral line of the can lid are combined and pressed to form a rail.

The quality of this closing has a great influence on the quality maintenance of the contents filled in the can. In other words, since the child hook (OL) between the body hook (BH) and the cover hook (CH) does not have a sufficient length, the wound portion has a defect. Cans can cause problems such as decay of the contents due to poor sealing. For this reason, the cans that have been wound It was necessary to inspect the parts regularly and control the process to prevent the occurrence of cans with poor winding.

In the conventional method of inspecting the can-clamping part, the cross section of the inside of the crimping can be visually inspected by cutting the crimping city in one direction using a thread saw. Or to measure the dimensions of each part. In addition, such inspection and measurement are usually performed at only three locations on the entire circumference of the tightened portion because the cutting operation using a thread saw requires time and effort.

As described above, the conventional method of inspecting the tightened portion of the can is performed by cutting the wrapped portion using a thread saw, thereby performing three inspections and setting measurement points. I was However, this cutting work is time-consuming and poses a problem because of the risk of cutting the fingers.

In addition, the tip of the body hook (BH) and cover hook (CH) in the tightened portion often generates irregular undulations in a short cycle due to the tightening. Therefore, the conventional method of judging the quality of the entire circumference of the tightened portion based on the inspection and measurement at about three locations also had a problem that it lacked the resilience. The present invention has been made in order to solve such a problem, and uses X-ray fluoroscopic information of a wrapped portion, particularly, fluoroscopic X-ray fluoroscopic information. Allows for sufficient tightening to obtain reliable test results The purpose is to provide an inspection method for can-tightened parts that enables safe, quick and easy inspection and measurement of each point.

Disclosure of the invention

The present invention relates to an X-ray source arranged close to one end in a radial direction of a can-tightening target to be inspected, and an X-ray information input means arranged near the other end of the can-tightening part to be inspected. By projecting X-rays, X-ray fluoroscopic information on the front of the can-winding section is input to the above-mentioned X-ray input information means, and measurement of the can-winding section is performed using the X-ray fluoroscopic information. There is a way to do this.

In addition, the large invention uses an X-ray source located close to one end in the radial direction of the can-tightened portion to be inspected, and an X-ray placed S near the other end of the inspected can-tightened portion. By projecting X-rays toward the information input means, X-ray fluoroscopic information of the front side of the can winding part is input to the above-mentioned X-ray input information means, and can-winding is performed using this X-ray fluoroscopic information. It is a method to measure the tightening part.

Further, according to the present invention, an X-ray is projected in a tangential direction to a tightened portion of a can to be inspected, and the X-ray transmitted through the tightened portion is input to an X-ray camera. The X-ray fluoroscopic information of the cross section of the tightened part is obtained, and the X-ray fluoroscopic information is further image-processed to obtain a surface image of the tightened part, and the can is tightened based on this image. It is a method to inspect the cross-sectional shape of the part. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a structural diagram showing a first embodiment of the method of the present invention; FIG. 2 is a diagram showing a new surface and an X-ray front see-through image of a can winding portion; FIG. 3 (a) and (b) are Configuration diagrams each showing a modified example of the embodiment;

Fig. 4 is a block diagram showing a second embodiment of the thick invention method; Figs. 5 (a) and (b) are each a block diagram showing a modification of the same embodiment;

Fig. 6 is a block diagram showing the third embodiment of the * method; Fig. 7 is a diagram showing a cross section of the can winding part and a X-ray front perspective image;-Figs. 8 (a) and (b) are respectively Configuration diagram showing a modification of the embodiment;

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

First embodiment

FIG. 1 is a configuration diagram showing a first embodiment, and FIG. 2 is a diagram showing a new surface and an X-ray front see-through image of a can winding portion.

In FIG. 1, reference numeral 1 denotes a can to be inspected, and a canned portion 4 for connecting a can frame 2 and a can lid 3 is formed at an end in the axial direction. As shown in FIG. 2, the tightening portion 4 is provided with a body hook (BH and BH) formed on the edge of the can frame 2. The cover hooks (CH) formed on the outer periphery of the can 3 are firmly engaged with each other in a crimped state. In order to judge the quality of the tightening part 4, the body hook (BH), the cover hook (CH), and the overlapping portion of these

Each dimension data such as (0L) is required.

10 is an X-ray source with a focus of 0.1 to 1.

0.3 mm φ), so-called fine focus: X-ray tube is used. This X-ray source 10 emits: The X-ray energy should be set to the size shown in the table below, for example, depending on the material of can 2 and can 3. Is desirable.

Reference numeral 11 denotes an X-ray camera as X-ray information input means for inputting X-ray fluoroscopic information to the tightening unit 4. That is, the can 1 is wound between the X-ray source 10 and the X-ray camera 11.

paper An X-ray transmitted through the fastening portion ⁴ is input as the X-ray fluoroscopic information relating to the fastening portion 4. Here, the X-ray camera 11 is placed S as close as possible to the winding part 4 of the can 1.

In addition, the winding part 4 of the can 1 is placed S so that the front side, that is, the surface of the winding wall 4 a for the winding is opposed to the X-ray source 10. . At this time, if the can 1 is arranged with the can lid plane parallel to the X-ray 10a projected from the X-ray source 10, the winding The two points, the upper end 4b and the lower end 4c of 4, are located on the X line. Then, information obtained by seeing through these two places is overlapped and input to the X-ray camera 11, so that accurate X-ray fluoroscopic information cannot be obtained.

In the method of the present invention, the can i is arranged so that the plane of the can lid is inclined at an arbitrary angle with respect to the X-rays 10a projected from the X-ray source 10, and the tightening section is provided. By avoiding the upper end 4 b of 4, the X-ray is directly projected on the lower end 4 c close to the X-ray camera 11. In the present embodiment, generally, chuck gall 4a is set to have an inclination angle 0 of about -8 degrees with respect to can 2 and g The can 1 is inclined by e (approximately 4 to 8 degrees) with respect to the X-rays 10a projected from 0.

Means for setting this inclination angle are shown in Fig. 1.

A new style In addition, any of means for tilting the x-ray light source l 0 and s, or means for tilting the can 1 may be employed.

Reference numeral 12 denotes an image processing device, which performs image processing on the X-ray fluoroscopic information of the cinching section 4 input to the X-ray camera i 1, and places the wrapping section 4 on the display 13. Display the front perspective image of. As shown in Fig. 2, the overlapping perspective of the body hook (BH) and the cover hook (CH) is shown in black, white and gray as the front perspective image. A two-dimensional image A displayed in a contrast and a one-dimensional image B in which the strength of the contrast in the two-dimensional image is displayed in a graph are used. In the case of visual inspection only, only the two-dimensional image A may be used, and in the case of only dimensional measurement, only the one-dimensional image B may be used.

Next, a description will be given of a method for detecting and detecting a can-wound portion using the above-described apparatus.

An X-ray 10a is projected from the angle of the inclination angle e with respect to the plane of the can lid of the can 1 to the front of the tightening portion 4 (the surface of the chuck wall 4a). Then, the X-ray camera 11 arranged on the back of the winding portion 4 has a body hook (BH) and a cover hook (CH) in the winding city 4. An X-ray transmission intensity distribution corresponding to the degree of overlap is input as X-ray fluoroscopic information. This X-ray fluoroscopic information is subjected to image processing such as enhancement of light and dark contrast by an image processing device 12, and is displayed on a display 13. Are displayed as front see-through images A and B of the tightening portion 4. Here, the winding portion 4 is divided into six parts as indicated by @ to ® in FIG. The arrangement of each of these parts does not change as long as the body hook (BH) and the cover hook (CH) are in a state where they can be combined. However, if there is a defect such as a short length of body hook (BH) or cover hook,,, (CH), the radiation of each part corresponds to the contents of the liability. Causes wide and narrow changes.

In other words, the normal tightening portion 4 has a sufficient length of the overlapping portion (OL) of the body hook (BH) and the cover hook (CH) as shown in FIG. Is held.

This overlapping portion (OL) appears in the two-dimensional image A as the darkest portion existing at the center. If the body hook (BH) or the cover hook (CH) is not properly tightened due to its short length, etc., the two-dimensional image A is used. The width of the part becomes narrower.

As described above, the width of each portion @ to ⑤ in the two-dimensional image A changes in response to the defect of the winding portion 4, so that these widths are compared with those in the normal case. By performing a visual inspection while checking, it is possible to determine the quality of the tightened portion 4.

The length of each part of the winding part 4, for example, the length of each of the body hook (BH), the cover hook (CH), and the overlapping part (OL) is set in the one-dimensional image B. Based on the processing The first measurement can be performed.

That is, the body hook (BH) = Φ) + © + φ

Cover hook (CH) = @ + () +

Polymer part (0L) = ®

It becomes.

It is also possible to judge the quality of the tightened portion based on these measured values.

In addition, such an inspection can be performed by rotating the can relative to X-rays to inspect the entire circumference of the re-tightened portion.

FIGS. 3 (a) and 3 (b) are views showing a modified example of the first embodiment.

The same parts as those in the apparatus shown in FIG. 1 are denoted by the same reference numerals, and detailed description of those parts will be omitted.

The device shown in FIG. 1A uses an X-ray line sensor 21 as an X-ray information input means. That is, the X-rays projected from the X-ray source 1.0 and transmitted through the tightening unit 4 are converted into the respective elements of the X-ray liner 21 arranged close to the tightening unit 4. And converts them into electric signals and outputs them to the signal processing device 22. The signal processor 22 processes the electric signal sent from each sensor element to generate one-dimensional information (one-dimensional image in FIG. 2) corresponding to the X-ray transmission intensity distribution. Image B-the same information) is output to the output device 23. Furthermore, if this one-dimensional information is processed, as in the device shown in FIG. 1, the length of each part of the tightening section 4, for example, the body hook (BH), The lengths of the cover hook (CH) and the overlap (OL) can be determined.

The apparatus shown in FIG. 3 (b) uses the X-ray sensor 31 as the X-ray information input means. That is, it is projected from the X-ray source 10 and transmitted through the tightening unit 4: X-rays are input to the X-ray sensor 31 placed close to the tightening unit 4 and placed S. Here, a shielding plate 34 provided with a pinhole (0.5 m πφ or less) 34 a is provided in front of the X-ray sensor 31, whereby the binhole 3 is formed. Only X-rays suitable for 4a are input to the X-ray sensor 31 to prevent a decrease in accuracy due to X-ray diffusion.

Further, in the case of the present apparatus, the can 1 is moved in the 铀 direction (the direction of the arrow in the drawing) in order to scan the entire tightening unit 4. Note that the X-ray source 10 and the X-ray sensor 31 may be moved in the direction of the arrow with respect to the can 1 as a matter of course.

The X-rays input to the X-ray sensor 31 are converted into electric signals and input to the signal processing device 32. In the signal processing device ₃ 2 processes the time-series input signal, one-dimensional corresponding to X-ray transmission strength distribution information of the (one-dimensional image image that put in Figure 2 and the 3 m C a) Similar to one-dimensional information obtained by the device Information) is output to output device 3 3. By processing the one-dimensional information, it is possible to determine the length of each part of the tightening unit 4 in the same manner as in the above-described apparatus example. Wear .

As described above, according to the method of the present invention which is performed using the apparatus shown in each of FIGS. 1 and 3 (a) and (b), the inspection and measurement of the tightening capital 4 can be performed on the X-ray fluoroscopic information. It can be done very quickly.

Therefore, a large number of inspections and measurements can be performed at short intervals over the entire circumference of the tightening portion 4, and the results can be obtained with high reliability.

The present invention can be implemented by the following modified examples.

Inspection method for can-tightened parts where the inclination angle of the cross section of the can with respect to Φ X-ray was set to an angle other than 4 to 8 degrees.

(2) As an X-ray information input means, use can be made of an X-ray camera, an X-ray line sensor, and a means other than the X-ray sensor for detecting the X-ray transmission intensity distribution. Inspection methods.

③ On the X-ray track projected from the X-ray source,

Inspection method for can-can-clamping equipment equipped with means for preventing halting that occurs on the periphery of X-ray fluoroscopic images. The halting prevention means is unnecessary when the X-ray information input means is other than an X-ray camera.

缶 A method for inspecting canned parts that automatically determines the quality of the canned parts using the obtained X-ray fluoroscopic information. Second embodiment

FIG. 4 is a configuration diagram of the second embodiment.

In FIG. 4, reference numeral 1 denotes a can to be inspected, and a winding portion 4 for connecting the can 2 and the can lid 3 is formed at an end in the direction of the arrow.

Reference numeral 10 denotes an X-ray source, which uses a so-called broad-focus X-ray tube having a focal point of 3 mmφ or more (usually about 5ππιφ). The X-ray energy emitted by the X-ray source 10 is desirably set to, for example, the size shown in the table below, depending on the material of the can body 2 and the can lid 3.

Reference numeral 1 denotes an X-ray camera for inputting X-ray fluoroscopic information on the wrapping portion 4. That is, the fastening part 4 of the can 1 is placed S between the X-ray source 10 and the X-ray camera 11, and this winding is performed. The X-Jip that has passed through the fastening section 4 is input as the X-ray fluoroscopic information regarding the fastening section 4. Here, the can 1 is arranged so that the central axis is substantially orthogonal to the X-ray line. Further, the X-ray source 10 and the X-ray camera 11 are arranged close to the upper and lower ends 4b and 4c of the wrapping portion 4, respectively.

In such an arrangement, the X-rays from the X-ray source 10 penetrate through the upper end 4b and the lower end 4c of the tightening portion 4 at two places. However, the X-ray source 10 used in the present embodiment is a broad-focus X-ray tube having a large focal point, which is located close to the upper end 4b of the tightening area. Due to the arrangement, X-rays 10a passing through the upper end 4b of the tightening part are diffused as shown in the figure, making it impossible to input with the X-ray camera 11 Or, even if input is possible, the image is blurred and no image is formed. On the other hand, the X-ray 10b passing through the lower end 4c of the wrapped portion passes through the lower end 4c and is input to the X-ray camera 11 at a nearby position, so that clear image information is obtained. .

From the above principle, the X-ray fluoroscopic information on the upper end 4b of the tightened portion can be almost ignored, and the X-ray camera 11 and the lower end 4c of the tightened portion have almost no effect. Only the X-ray fluoroscopy information related to this will be clearly input.

1 2 Ri der image processing apparatus, and an X-ray fluoroscopy information _X Senka ra 1 1 tightening portion 4 which is input to the brightness Control This setup La be sampled emphasized that any image processing, de I Tightening part 4 on spray 13 Display the front perspective image of. As the front perspective image, as shown in Fig. 2, the overlap of the pod hook (BH) and the cover hook (CH) is indicated by the black, white, and ash contours. The two-dimensional image A displayed in a list and the one-dimensional image in which the strength of contrast in the two-dimensional image is displayed in a graph are used. In the case of only visual inspection, only the two-dimensional image A may be used, and in the case of only dimensional measurement, only the one-dimensional image B may be used.

Next, a method for inspecting a can-sealed portion using the above-described apparatus will be described.

From the X-ray source 10, X-rays are projected onto the front of the tightening section 4 (the surface of the chuck 4 a). Then, S is placed near the back of the wind-up unit 4. The X-ray camera 11 has a body hook (BH) at the lower end 4c of the wind-up unit and a hook. The X-ray transmission intensity distribution corresponding to the degree of overlap of the hooks (CH) is input as X-ray fluoroscopic information. The X-ray fluoroscopic information is image-processed by the image processing device 12, and displayed on the display 13 as frontal fluoroscopic images A and B of the tightening unit 4.

Here, the tightening portion 4 is divided into six parts as shown by (I) to ⑤ in FIG. The S row for each city does not change as long as the body hook (BH) and the cover hook (CH) are in a state of interlocking. However, the width of each part is, for example, body hook (BH) or cover hook. If there is a defect such as a short hook (CH), a wide or narrow change will occur in response to the content of the defect.

That is, as shown in FIG. 2, the normal tightening portion 4 has a sufficient overlapping portion (OL) between the pod hook (BH) and the cover hook (CH). It holds the length.

This overlapping portion (OL) appears in the two-dimensional image A as the darkest portion existing in the central city. If the body hook (BH) or canopy hook (CH) is too short to be in the normal winding state, the two-dimensional image A The width of the part ® becomes narrower.

As described above, in response to the defect in the tightening portion 4, the width of each portion in the two-dimensional image A changes, so that these widths are the same as in the normal case. By performing a visual inspection while comparing, it is possible to determine the quality of the wound portion 4.

In addition, the length of each part of the wind-up part 4, for example, the length of each of the hook (BH), the cover hook (CH), and the overlapping part (OL) is expressed in the one-dimensional image B. Based on this, it is possible to easily calculate the measured values by performing arithmetic processing.

That is, the body hook (BH) = ® + © +

Cover hook (CH) = (d) + (|) +

The overlap (OL)-(φ.

Based on these measured values, determine the quality of the tightened part ^ You can do that too.

In addition, it is also possible to perform such inspection by rotating the can relative to the X-ray to inspect the entire periphery of the tightening portion.

Figs. 5 (a) and (b) are configuration diagrams showing another example of an apparatus for performing the present method.

The same parts as those in the apparatus shown in FIG. 4 are denoted by the same reference numerals, and detailed description of those parts will be omitted.

The device shown in FIG. Ca) uses an X-ray line sensor 21 as X-ray information input means. In other words, the X-rays 10 b projected from the X-ray source 10 and transmitted through the lower end 4 c of the tightening device are placed in the X-ray sensor 21 close to the tightening unit 4. The signals are converted into electric signals and output to the signal processing device 22. The signal processor 22 processes the electric signal sent from each sensor element to generate one-dimensional information corresponding to the X-ray transmission intensity distribution (similar to the one-dimensional image B in FIG. 2). Is output to the output device 23.

Further, if this one-dimensional information is subjected to arithmetic processing, similarly to the apparatus shown in FIG. 4, the length of each part of the winding part 4, for example, the body hook (BH), the cover The lengths of the hook (CH) and the overlap city (OL) can be determined.

The device shown in Fig. 5 (b) uses X-rays as X-ray information input means.

New paper The sensor 31 was used. That is, the X-rays projected from the X-ray source 10 and transmitted through the lower end 4 c of the winding portion are input to the X-ray sensor 31 arranged close to the winding portion 4. Here, a shielding plate 34 having a pinhole (0.5 _mm <jb or less) 34a is provided in front of the X-ray sensor 31. Only X-rays that have passed through the pinhole 34a are input to the X-ray sensor 31 to prevent a decrease in accuracy due to X-ray diffusion.

In addition, in the case of this apparatus, the can 1 is moved in the axial direction (the direction of the arrow shown in the figure) in order to scan the whole of the tightening unit 4. The X-ray source 10 and the X-ray sensor 31 may be moved in the direction of the arrow with respect to the can 1 as a matter of course.

The X-rays input to the X-ray sensor 31 are converted into electric signals and input to the signal processing device 32. The signal processing device 32 processes the signals input in a time series to obtain one-dimensional information corresponding to the X-ray transmission intensity distribution (the one-dimensional image in FIG. 2 and the one in FIG. 5 (a)). The same information as the one-dimensional information obtained by this device is output to the output device 33. By processing the one-dimensional information, the length of each part of the tightening unit 4 can be calculated in the same manner as in the example of the apparatus described above.

As described above, the apparatus shown in FIGS. 4 and 5 (a) and (b) is used to carry out the method. Inspection and measurement in 4 can be quickly performed based on X-ray fluoroscopic information.

As a result, a large number of inspections and measurements can be made at short intervals around the entire circumference of the tightening section 4, and the results can be obtained with high convergence.

In addition, it can be implemented by the following modified examples.

① As the X-ray information input means, the X-camera, X-line sensor, and other means other than the X-ray sensor can be used to detect the X-ray transmission intensity distribution. Inspection method _β

(2) A method of inspecting a can-clamping section provided with means for preventing eight-sections that occur around the X-ray fluoroscopic image of the crimping section on the X-ray track projected from the X-ray source. It should be noted that the above-mentioned Halle over _three down prevention means-out door X-ray information input means other than the X Senka ra is Ru unnecessary der.

(3) An inspection method for can-sealed parts that automatically determines the quality of can-sealed parts using X-ray fluoroscopic information.

Third embodiment

FIG. 6 is a configuration diagram showing a third embodiment.

In FIG. 6, reference numeral 1 denotes a can to be inspected, and a canned portion 4 for connecting the can body 2 and the can 3 is formed at the end in the direction of the arrow. As shown in FIG. 7, the wrapping portion 4 includes a pod hook (Β Η) formed on the edge of the can body 2 and a cap formed on the outer periphery of the can 3. Bar hook (CH) and However, they are firmly joined together in a crimped state. In order to judge the quality of the tightening portion 4, for example, a body hook (BH), a cover hook (CH), an overlap portion of these (OL), and an It is necessary to observe the condition of allance (UC) and lower clearance (LC).

10 is an X-ray tube as an X-ray source.

This: The X-ray energy emitted by the X-ray tube 10 depends on the material of the can body 2 and the can lid 3. For example, it can be set to the following size. Desirable.

Reference numeral 1 denotes an X-ray camera for inputting X-ray fluoroscopic information on the wrapper 4. That is, the winding part 4 of the can 1 is arranged between the X-ray tube Γ 0 and the X-ray camera 11, and the X-ray transmitted through the winding part 4. , Is input as X-ray fluoroscopic information on the tightening unit 4. Here, can 1 is The tangent should be placed along the X-ray 10a line.

The X-ray 10a passes through the portion indicated by the hatching in FIG. 1 with respect to the canned portion 4 of the can placed S in this manner. Therefore, the X-ray fluoroscopic information input to the X-ray camera 11 is obtained by superimposing the partial cross-sectional fluoroscopic information indicated by the above-mentioned hatching, and forming the drilling unit 4. It is not information that sees only the new face 4d. Therefore, in the process of image processing, it is necessary to extract a surface image of the tightening portion from the X-ray fluoroscopic information.

Reference numeral 12 denotes an image processing device, which performs image processing of extracting a cross-sectional image of the tightened portion from X-ray fluoroscopic information. In other words, with respect to the image signal obtained from the X-ray fluoroscopic information input to the X-ray camera 11, the contrast exceeds a certain level with respect to a certain contrast. By highlighting the parts that have the same contrast and cutting out the parts below the standard, an image that approximates the true image of the new surface of the tightened part is extracted. Can be done. All this image processing is performed using a computer. The surface image of the winding city 4 obtained in this way is displayed on the display 13.

Next, a method for inspecting the cross-sectional shape of the can-tightened portion using the above-described apparatus will be described.

An X-ray is projected from the tangential direction to the winding part 4 of the can 1, and the X-ray transmitted through the winding part 4 is used as X-ray camera information as X-ray fluoroscopic information on the tightening surface. Enter the number in the box. X-ray camera 11 converts the input X-ray fluoroscopic information into an electric signal and outputs it to the image processing device 12. The image processing device 12 extracts the image of the new front surface 4 d of the tightening unit 4 by emphasizing a portion having a contrast exceeding a certain standard. The cross-sectional image of the tightened portion 4 from which the oil has been drained in this way is displayed on the display 13, so that the inspector can display the cross-sectional image on the display 13. Based on the cross-sectional image, the cross-sectional shape of the can winding part 4 can be visually inspected.

The cross-sectional image of the tightened part 4 displayed on the display 13 is almost similar to the cross-sectional shape of the tightened part 4 shown in Fig. 7 in the case of the normal tightened part 4. Shape. That is, the shape is such that the body hook (BH), the cover hook (CH), and the overlapping portion (OL) of these have a sufficient length. On the other hand, if the tightened portion 4 has a defect, one or all of the above portions are short, and the combination is incomplete. Therefore, based on the cross-sectional image of the tightening unit 4 displayed on the display, if these determinations are made, it is possible to easily and quickly detect a defective can in the winding. be able to .

By performing such an inspection by rotating the can 1 relative to the X-ray, the force S can be used to inspect the entire circumference of the tightened portion. . Next, Figs. 8 (a) and (b) show the peripheral image of FIG. 3 is a diagram showing an example of an apparatus provided with a means for preventing halting that occurs in FIG.

The cross-sectional image of the tightened portion 4 displayed on the display 13 has a peripheral edge due to the X-ray diffraction phenomenon. The outline of the periphery may be unclear.

Therefore, in order to prevent this harshness, in FIG. C a), at least the holder 21 is brought close to the periphery of the tightening portion 4 on at least the X-ray line. Are in contact with each other. Thus, the sharpening difference between the winding portion 4 and the outer periphery thereof and the harting can be prevented. In the same figure (b), a wedge-shaped filter 22 is inserted on the X-ray line, and similarly, the difference in brightness between the outer periphery of the tightened portion 4 and the outer periphery is reduced. To prevent harm. Here, the reason why the wedge shape is adopted is to adjust the amount of blocking the X-rays according to the difference in the thickness of the tightened portion through which the X-rays pass.

If the X-ray fluoroscopic information is obtained through such a halting prevention means, the halting may occur in the cross-sectional image of the tightened portion. Dimensional errors can be eliminated,

—High-precision inspection of the surface shape of the can-clamping part can be performed.

In addition, it can be implemented by the following modified examples. (1) Based on the cross-sectional image of the can winding part, the can winding part

For example, measure the dimensions of each part, such as the body hook (BH), the cover hook (CH), the overlapping portion (OL), and the overall length (W) of the tightening portion. New surface shape inspection method for canned parts.

(2) A new method for inspecting the surface of cans that uses well-known various image processing techniques as image processing means for X-ray fluoroscopic information.

(3) A new surface shape inspection method for the canned part other than the display is used to obtain a cross-sectional image of the part.

(4) A method for inspecting the cross-sectional shape of a can-tightened portion, which automatically determines the quality of the cross-sectional shape of the can-tightened portion based on the obtained cross-sectional image of the tightened portion.

Claims

The scope of the claims

1. Place a can to be inspected on the line between the X-ray source and the X-ray information input means. By projecting X-rays, X-ray fluoroscopic information on the front of the can-winding portion is input to the X-ray information input means, and the can-winding portion is inspected using the X-ray fluoroscopic information. This is a method of inspecting the can-sealed part that specializes in this.

The claim 1 is characterized in that the inclination angle is set to 4 to 8 degrees corresponding to the angle formed by the chuck hole of the winding portion with respect to the can body. Inspection method of canned part described in section.

3. The method for detecting a can-sealed portion according to claim 1, wherein the X-ray source is a fine focus X-ray tube.

4. The method for inspecting a can-tightened part according to claim 1, wherein the X-ray information input means is an X-ray camera. -

5. The method for inspecting a can-sealed portion according to claims 1, 2 or 3, wherein the X-ray information input means is an X-ray sensor.

6. The can-tightening device according to claims 1, 2 or 3, wherein the X-ray information input means is an X-ray sensor. Inspection method.

7. From the X-ray source arranged close to one end of the inspection part can-winding part in the radial direction, to the X-ray information input means located near the other end of the inspection part can-tightening part By projecting X-rays, the X-ray fluoroscopic information on the front of the can-winding portion is input to the X-ray input information means, and the measurement of the can-tightening portion is performed using the X-ray fluoroscopic information. Inspection method for can-tightened parts, specializing in this.

8. The inspection method for a can-sealed portion according to claim 7, wherein the X-ray source is a broad focus X-ray tube.

9. The method according to claim 7 or 8, wherein the X-ray information input means is an X-ray camera.

10. The method for inspecting a can-tightening method according to claim 7 or 8, wherein the X-ray information input means is an X-ray sensor.

11. The inspection method for a can-tightening portion according to claim 7 or 8, wherein the X-ray information input means is an X-ray sensor.

1 2 · Claim 7 or 11 characterized by the fact that the central axis of the measuring element can be made orthogonal to the X-ray line projected from the X-ray source. Any of the following items: How to inspect the part.

1 3. X-rays are projected tangentially to the tightened part of the can to be inspected, and the X-ray transmitted through the above-mentioned tightened part is input to the X-ray camera. Obtain X-ray fluoroscopic information of the surface, further process this X-ray fluoroscopic information to obtain a cross-sectional image of the seam-tightened part, and based on this image, inspect the surface shape of the can-sealed part. Inspection method for can-tightened parts, which is specially designed to be used.

14. The method according to claim 13, wherein the X-ray is input to the X-ray camera through a means for preventing the occurrence of a harshness generated around the cross-sectional image of the winding portion. How to inspect the canned area o