JPH04136702A - Method for inspecting rolled state of can - Google Patents

Method for inspecting rolled state of can

Info

Publication number
JPH04136702A
JPH04136702A JP25721090A JP25721090A JPH04136702A JP H04136702 A JPH04136702 A JP H04136702A JP 25721090 A JP25721090 A JP 25721090A JP 25721090 A JP25721090 A JP 25721090A JP H04136702 A JPH04136702 A JP H04136702A
Authority
JP
Japan
Prior art keywords
image
rays
seaming
dimensions
lid
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP25721090A
Other languages
Japanese (ja)
Other versions
JP3081224B2 (en
Inventor
Akira Watari
彰 渡里
Katsuoki Kasai
河西 勝興
Hiroshi Nakayama
博司 中山
Makoto Sakazume
坂詰 良
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sapporo Breweries Ltd
Original Assignee
Sapporo Breweries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sapporo Breweries Ltd filed Critical Sapporo Breweries Ltd
Priority to JP02257210A priority Critical patent/JP3081224B2/en
Publication of JPH04136702A publication Critical patent/JPH04136702A/en
Application granted granted Critical
Publication of JP3081224B2 publication Critical patent/JP3081224B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Abstract

PURPOSE:To eliminate the need for cutting a can by extracting a main body of a can and a rolled part of the can lid according to luminance distribution of X-rays image in tangential direction of the can and then obtaining dimensions of each specified part in the above from the amount of change in luminance of the rolled part. CONSTITUTION:An X-rays tube 11 emits X rays 12 in tangential direction of a rolled edge part for a can 13 which is to be inspected and an X-rays camera 14 receives X rays which are transmitted through the can 13 for forming an image. The X rays image is output to an image forming device 22. The image forming device 22 overlaps a plurality of output images of an X-rays inspection device 21 for the purpose of eliminating noise which is included within image and then outputs it to an image processing device 23. The image processing device 23 performs a specified processing for the image whose noise is eliminated, calculates the above each management dimensions, and then displays the result on an CRT 26.

Description

【発明の詳細な説明】 [産業上の利用分野] 本発明は、缶の巻締状態を非破壊で検査する缶の巻締状
態検査方法に関する。
DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for non-destructively inspecting the seaming condition of a can.

[従来の技術] 缶は、第7図に示すように缶本体73と缶本体73に被
せられる缶蓋72とを共に巻締めることにより内部の密
閉が図られる。第8図はこれらの巻締め状態を示すもの
で、第7図中の巻締端部71の拡大断面図を示すもので
ある。
[Prior Art] As shown in FIG. 7, the interior of a can is sealed by tightening a can body 73 and a can lid 72 that covers the can body 73. FIG. 8 shows the state of these seams, and is an enlarged sectional view of the seam end 71 in FIG. 7.

缶蓋72と缶本体73は、缶蓋72が外周部を覆うよう
に巻締めされる。
The can lid 72 and the can body 73 are tightened so that the can lid 72 covers the outer periphery.

巻締めが正常なものであるかの検査は、第8図中に示さ
れる巻締め部分の幅(W)、厚さ(T)、缶蓋72の折
返し部分の長さを示すカバーフック(CH)、缶本体7
3の折返し部分の長さを示すボディフック(BH)およ
びカバーフック(CH)とボディフック(BH)とが重
複して折曲げられる部分の長さを示すオーバーラツプ(
OL)等の管理寸法を計測し、各管理寸法と所定の基準
値を比較することにより行なわれる。
To check whether the seaming is normal, check the cover hook (CH) which shows the width (W), thickness (T) of the seaming part and the length of the folded part of the can lid 72 shown in FIG. ), can body 7
The body hook (BH) indicates the length of the folded part of 3, and the overlap (BH) indicates the length of the part where the cover hook (CH) and body hook (BH) are overlapped and folded.
This is done by measuring control dimensions such as OL) and comparing each control dimension with a predetermined reference value.

従来、上記の各管理寸法を計測することは、缶の巻締部
を切断し、マイクロメータ等によって直接測定により行
うが、または切断面の拡大投影画像を形成させてこれの
寸法を測る間接測定により行っていた。
Conventionally, each of the above-mentioned control dimensions has been measured by cutting the seam of the can and directly measuring it with a micrometer, etc., or indirectly measuring the dimensions by forming an enlarged projected image of the cut surface. It was done by

[発明が解決しようとする課題] 上述した従来の缶の@締状態検査方法は、直接測定、間
接測定のいずれの場合においても缶の巻締部を切断する
必要があり、また、これに伴なって充填物を排出させる
必要も生じるため、手間がかかり、検査に時間がかかる
という問題点かある。
[Problems to be Solved by the Invention] In the conventional method for inspecting the @tightness of cans described above, it is necessary to cut the seamed portion of the can in both direct and indirect measurements, and as a result, there are Then, it becomes necessary to discharge the filled material, which is a problem in that it is labor-intensive and takes time to perform the inspection.

本発明は上記従来技術が有する問題点に鑑みてなされた
ものであって、缶の巻締状態のX線像を撮影して画像処
理を行うことにより、缶の巻締状態を示す各管理寸法を
缶を破壊することなく計測することのできる缶の巻締状
態検査方法を実現することを目的とする。
The present invention has been made in view of the problems of the above-mentioned prior art, and by taking an X-ray image of the seaming state of the can and performing image processing, each management dimension indicating the seaming state of the can is The purpose of the present invention is to realize a method for inspecting the seaming condition of a can that can measure the seaming condition of a can without destroying the can.

[課題を解決するための手段] 本発明の缶の巻締状態検査方法は、 缶本体と缶蓋とが共に巻締められることによりその密閉
が図られる缶の巻締状態を前記缶本体および缶蓋の折曲
げ量等の各所定部位の寸法から検査する缶の巻締状態検
査方法であって、巻き締められた缶の接線方向のX線画
像を撮影し、該X線画像の輝度分布により前記缶本体お
よび缶蓋の巻締部分を抜出し、該巻締部分の輝度変化量
から前記各所定部位の寸法を求める。
[Means for Solving the Problems] The method for inspecting the seaming condition of a can according to the present invention is to check the seaming condition of a can whose seal is achieved by seaming the can body and the can lid together. This is a method for inspecting the seaming condition of cans based on the dimensions of each predetermined part, such as the amount of bending of the lid. The seamed portions of the can body and the can lid are extracted, and the dimensions of each of the predetermined portions are determined from the amount of change in brightness of the seamed portions.

[作用コ 缶の巻締状態を検査するための各所定部位の寸法は、X
線画像の輝度分布および輝度変化量から求められるので
、従来必要とされていた缶の切断は必要なくなる。
[The dimensions of each predetermined part for inspecting the seaming condition of the working can are
Since it is determined from the brightness distribution and the amount of change in brightness of the line image, cutting of the can, which was previously required, is no longer necessary.

[実施例] 次に、本発明の実施例について図面を参照して説明する
[Example] Next, an example of the present invention will be described with reference to the drawings.

第1図は本発明の一実施例に使用されるX線検査装置の
構成を示す図であり、第2図は第1図示のX線検査装置
を用いた本発明による検査システムの構成を示すブロッ
ク図である。
FIG. 1 is a diagram showing the configuration of an X-ray inspection device used in an embodiment of the present invention, and FIG. 2 is a diagram showing the configuration of an inspection system according to the present invention using the X-ray inspection device shown in FIG. 1. It is a block diagram.

X線検査装置は、X線管11とX線カメラ14により構
成される。X線管11は被検査物である缶13に対して
、巻締端部の接線方向のX線12を照射し、X線カメラ
14は缶13を透過したX線を受けて像とする。このよ
うにして得られる測定画像の分解能はX線カメラ14の
1画素当りの大きさで決定されるもので、本実施例のも
のにおいては1.705/+00 ([11111)で
あった。
The X-ray inspection device includes an X-ray tube 11 and an X-ray camera 14. The X-ray tube 11 irradiates the can 13, which is the object to be inspected, with X-rays 12 in the tangential direction of the seamed end, and the X-ray camera 14 receives the X-rays that have passed through the can 13 and creates an image. The resolution of the measurement image thus obtained is determined by the size per pixel of the X-ray camera 14, and in this example it was 1.705/+00 ([11111).

次に、本実施例のシステム構成について第2図を参照し
て説明する。
Next, the system configuration of this embodiment will be explained with reference to FIG. 2.

X線検査装置21は第1図示のものと同様に構成されて
おり、ここで得られたX線画像は画像形成装置22へ出
力される。画像形成装置22は画像中に含まれるノイズ
の除去を目的としてX線検査装置21の出力画像を複数
重ね合わせ、画像処理装置23へ出力する。画像処理装
置23は、ノイズ除去された画像に対して所定の処理を
施して上記の各管理寸法を算出し、その結果をCRT2
6に表示させる。画像処理装置23はCRT26のほか
に、プリンタ、プロッタ等の画像出力装置24およびフ
ロッピーディスク装置等の外部記録装置25と接続して
おり、これらの画像出力動作および記憶/読出し動作を
制御する。
The X-ray inspection device 21 is configured similarly to the one shown in the first figure, and the X-ray image obtained here is output to the image forming device 22. The image forming device 22 superimposes a plurality of output images from the X-ray inspection device 21 for the purpose of removing noise contained in the images, and outputs the superimposed image to the image processing device 23. The image processing device 23 performs predetermined processing on the noise-removed image to calculate the above-mentioned management dimensions, and displays the results on the CRT 2.
6. In addition to the CRT 26, the image processing device 23 is connected to an image output device 24 such as a printer or plotter, and an external recording device 25 such as a floppy disk device, and controls image output operations and storage/read operations thereof.

次に画像処理装置23における各管理寸法の算出過程を
説明する。X線画像はX線通過領域が積算されて端部か
不明瞭なものとなるので、通常の2値化画像では正確な
寸法を得ることができず、特別な画像処理が必要となる
Next, the calculation process of each management dimension in the image processing device 23 will be explained. Since the X-ray image has an integrated X-ray passing area and the edges become unclear, it is not possible to obtain accurate dimensions with a normal binarized image, and special image processing is required.

第3図は缶本体31の長手方向がX軸に沿ったものとし
た巻締部の構造を示す断面図である。
FIG. 3 is a sectional view showing the structure of the seaming portion in which the longitudinal direction of the can body 31 is along the X axis.

第8図に示す各管理寸法T、W、BH,CHおよびOL
を求めることはX座標点X、〜X5およびY座標点Y 
+ 、 Y 2の各座標位置から以上のようにして求め
ることができる。
Each control dimension T, W, BH, CH and OL shown in Fig. 8
To find the X coordinate point X, ~X5 and the Y coordinate point Y
It can be determined as described above from each coordinate position of + and Y2.

W = X 2  X +  ” (1)T=Y2−Y
、  −(2) BH−X5 X3 ・= (3) CH= X2  X4 = (4) OL = X 5  X 4 ・= (5)第4図は撮
影された巻線部画像の輝度分布図を示す図である。図中
、41は最暗部を示しており、これの外側に向かって徐
々に明度か増すものである。幅Wを算出するためのX、
、X2の座標は背景との明るさとの差から容易に求める
ことができ、これらの各座標と(1)式からWの値を求
めた。厚さTを算出するためのY、の座標はX、、X2
の各座標と同様に単純な二値化によって容易に求めるこ
とができ、Y2の座標は同−X座標中の最暗部41のY
座標として求めることができる。そこで各々のX座標に
ついて Tつ=Y211−YIX−(6) の値を先に求めたWの範囲内でそれぞれ計算し、その中
の最大値を厚さTとして定めた。
W = X 2 X + ” (1) T = Y2-Y
, -(2) BH-X5 X3 ・= (3) CH= X2 X4 = (4) OL = X 5 It is a diagram. In the figure, 41 indicates the darkest part, and the brightness gradually increases toward the outside of this part. X for calculating the width W,
, X2 can be easily determined from the difference in brightness from the background, and the value of W was determined from each of these coordinates and equation (1). The coordinates of Y to calculate the thickness T are X, , X2
It can be easily obtained by simple binarization in the same way as each coordinate of , and the coordinate of Y2 is the Y of the darkest part 41 in the
It can be obtained as coordinates. Therefore, the following values were calculated for each X coordinate within the range of W determined previously, and the maximum value was determined as the thickness T.

次に、BH,CHおよびOLを求めるための各点X3〜
x5の各座標を以下の如く求めた。
Next, each point X3 to find BH, CH and OL
Each coordinate of x5 was determined as follows.

第3図に示す缶本体13と缶蓋32とがその間に隙間が
生しないように巻締められた場合には第4図に示す輝度
分布はX軸方向に関しては一定のものとなり、Y軸方向
に関してのみ変化するものとなる。しかしながら、各点
x3〜x5の前後には第3図に示すように隙間か生して
いるため、X軸方向に関する輝度分布も一様のものでは
なくなる。したがって、同−X座標に関する複数の画素
の輝度を積算し、これを隣合うX座標のものと比較して
その差をとるX方向の微分動作を行うと各点x3〜x5
に相当する部分はピークとなフて現れる。
When the can body 13 and the can lid 32 shown in FIG. 3 are tightly wrapped so that there is no gap between them, the brightness distribution shown in FIG. 4 will be constant in the X-axis direction and will be constant in the Y-axis direction. It will only change with respect to However, since there are gaps before and after each point x3 to x5 as shown in FIG. 3, the luminance distribution in the X-axis direction is no longer uniform. Therefore, if we perform a differential operation in the X direction by integrating the luminances of multiple pixels regarding the same -X coordinate, comparing this with those of the adjacent X coordinate, and taking the difference, each point x3 to x5
The part corresponding to the peak appears as a peak.

第5図は上記の微分動作を行う範囲を示す図であり、第
6図はその結果を示す図である。
FIG. 5 is a diagram showing the range in which the above-described differential operation is performed, and FIG. 6 is a diagram showing the results.

微分動作が巻締部分のみで行われるように、その範囲を
(1)式で求められた幅W、(2)式で求められた厚さ
Tよりも所定量(例えば缶の板厚等)狭い枠51の範囲
内で行ったところ、第6図に示すようなりラフ画得られ
た。各ピーク部分を各点x3〜X、のX座標とし、(3
)式乃至(5)式を用いてBH,CHおよびOLを算出
した。
In order to ensure that the differential operation is performed only at the seaming part, the range is set by a predetermined amount (for example, the thickness of a can) than the width W determined by equation (1) and the thickness T determined by equation (2). When this was done within the narrow frame 51, a rough image as shown in FIG. 6 was obtained. Let each peak part be the X coordinate of each point x3~X, and (3
) to (5) were used to calculate BH, CH, and OL.

以上の方法により計測した各管理寸法を従来の切断によ
り計測した結果とともに表1に示す。ここで、測定単位
は(IIIIll)であり、21缶(1缶当り3箇所)
測定の平均値である。(以下余白)表  1 このように各管理寸法の測定を従来の切断による計測法
とほぼ同様の精度にて缶を破壊することなく行うことが
できた。
Table 1 shows each control dimension measured by the above method along with the results measured by conventional cutting. Here, the measurement unit is (IIIll), and 21 cans (3 locations per can)
This is the average value of the measurements. (Margin below) Table 1 In this way, each control dimension could be measured with almost the same accuracy as the conventional measurement method by cutting, without destroying the can.

[発明の効果] 本発明は以上説明したように構成されているので、以下
に記載するような効果を奏する。
[Effects of the Invention] Since the present invention is configured as described above, it has the following effects.

缶を切断することなく、缶の巻締状態を示す各管理寸法
を計測することができるため、検査時間を短縮すること
ができ、検査にががる手間を省くことができる効果かあ
る。
Since each control dimension that indicates the seaming condition of the can can be measured without cutting the can, the inspection time can be shortened and the effort required for inspection can be saved.

【図面の簡単な説明】[Brief explanation of drawings]

第1図は本発明に使用されるX線検査装置の構成を示す
図、第2図は本発明による検査システムの構成を示すブ
ロック図、第3図は巻締部の構造を示す断面図、第4図
は撮影された巻線部画像の輝度分布を示す図、第5図は
輝度変化量を求める微分動作を行う範囲を示す図、第6
図は第5図に示した範囲での微分動作の結果を示す図、
第7図は検査を行う缶の構成を示す正面図、第8図は缶
の巻締状態を検査するための各管理寸法の測定部位を示
す断面図である。 11−X線管、    12−X線、 13・・・缶、      14−X線カメラ、21・
・・X線検査装置、22−・画像形成装置、23−−・
画像処理装置、24・−画像出力装置、31−・缶本体
、   32・−缶蓋、4工・・・最暗部、    5
1・−枠。
FIG. 1 is a diagram showing the configuration of an X-ray inspection apparatus used in the present invention, FIG. 2 is a block diagram showing the configuration of the inspection system according to the present invention, and FIG. 3 is a sectional view showing the structure of the seaming part. Figure 4 is a diagram showing the brightness distribution of the photographed winding part image, Figure 5 is a diagram showing the range in which the differential operation is performed to determine the amount of change in brightness, and Figure 6 is a diagram showing the brightness distribution of the photographed winding part image.
The figure shows the results of differential operation in the range shown in Figure 5.
FIG. 7 is a front view showing the structure of the can to be inspected, and FIG. 8 is a cross-sectional view showing the measurement locations of each control dimension for inspecting the seaming state of the can. 11-X-ray tube, 12-X-ray, 13-Can, 14-X-ray camera, 21-
・・X-ray inspection device, 22-・Image forming device, 23--・
Image processing device, 24--Image output device, 31--Can body, 32--Can lid, 4th...Darkest part, 5
1.-frame.

Claims (1)

【特許請求の範囲】 1、缶本体と缶蓋とが共に巻締められることによりその
密閉が図られる缶の巻締状態を前記缶本体および缶蓋の
折曲げ量等の各所定部位の寸法から検査する缶の巻締状
態検査方法であって、 巻締められた缶の接線方向のX線画像を撮影し、該X線
画像の輝度分布により前記缶本体および缶蓋の巻締部分
を抜出し、該巻締部分の輝度変化量から前記各所定部位
の寸法を求めることを特徴とする缶の巻締状態検査方法
[Claims] 1. The tightening state of the can, in which the can body and the can lid are tightened together to achieve sealing, is determined from the dimensions of each predetermined portion of the can body and the can lid, such as the amount of bending. A method for inspecting the seaming state of a can to be inspected, comprising: taking an X-ray image of a seamed can in a tangential direction; and extracting the seamed portion of the can body and the can lid based on the brightness distribution of the X-ray image; A method for inspecting the seaming condition of a can, characterized in that the dimensions of each of the predetermined portions are determined from the amount of change in brightness of the seaming portion.
JP02257210A 1990-09-28 1990-09-28 Inspection method of canning condition Expired - Lifetime JP3081224B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP02257210A JP3081224B2 (en) 1990-09-28 1990-09-28 Inspection method of canning condition

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP02257210A JP3081224B2 (en) 1990-09-28 1990-09-28 Inspection method of canning condition

Publications (2)

Publication Number Publication Date
JPH04136702A true JPH04136702A (en) 1992-05-11
JP3081224B2 JP3081224B2 (en) 2000-08-28

Family

ID=17303193

Family Applications (1)

Application Number Title Priority Date Filing Date
JP02257210A Expired - Lifetime JP3081224B2 (en) 1990-09-28 1990-09-28 Inspection method of canning condition

Country Status (1)

Country Link
JP (1) JP3081224B2 (en)

Also Published As

Publication number Publication date
JP3081224B2 (en) 2000-08-28

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