JP2618303B2 - ERW pipe welding bead cutting shape measurement method - Google Patents
ERW pipe welding bead cutting shape measurement methodInfo
- Publication number
- JP2618303B2 JP2618303B2 JP3273449A JP27344991A JP2618303B2 JP 2618303 B2 JP2618303 B2 JP 2618303B2 JP 3273449 A JP3273449 A JP 3273449A JP 27344991 A JP27344991 A JP 27344991A JP 2618303 B2 JP2618303 B2 JP 2618303B2
- Authority
- JP
- Japan
- Prior art keywords
- cutting
- shape
- bead
- erw pipe
- bead cutting
- 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.)
- Expired - Lifetime
Links
Description
【０００１】[0001]
【産業上の利用分野】本発明は、電縫管ビード切削形状
計測方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for measuring a bead cutting shape of an ERW pipe.
【０００２】[0002]
【従来の技術】従来、電縫管溶接ビード切削形状計測方
法としては、レーザ光切断方法による形状検出器が特開
昭５７−１０８７０５号公報により知られている。光切
断法とは、図２のように被測定面４に光切断角θ1でス
リット光３を投射しこれと異なる角度θ2から見ると等
価的にその断面形状が計測できる形状測定方法である。
しかし、特開昭５７−１０８７０５号公報では光切断面
画像の記録までで定量化するに至っていない。すなわ
ち、溶接ビード切削形状の評価は人間の目視判定に依存
し自動計測に至っていない。また、定量方法としては、
特開昭５７−１３７０２７号公報があるが、直接的に切
削形状を算出するのではなく光切断角によって得られる
プロフィールと予め管の内径から算出した基準式との差
から判定しているため計測誤差が大きい。2. Description of the Related Art Conventionally, as a method of measuring a weld bead cutting shape of an ERW pipe, a shape detector based on a laser beam cutting method is known from Japanese Patent Application Laid-Open No. 57-108705. The light cutting method is a shape measuring method in which the slit light 3 is projected onto the surface 4 to be measured at a light cutting angle θ 1 as shown in FIG. 2 and its cross-sectional shape can be equivalently measured when viewed from a different angle θ 2. is there.
However, in JP-A-57-108705, the quantification has not been completed up to the recording of the light-section image. That is, the evaluation of the weld bead cutting shape depends on human visual judgment, and has not been automatically measured. In addition, as a quantification method,
Japanese Patent Application Laid-Open No. 57-137027 discloses a method in which a cut shape is not directly calculated, but a determination is made based on a difference between a profile obtained by a light cutting angle and a reference formula previously calculated from the inner diameter of a pipe. The error is large.
【０００３】[0003]
【発明が解決しようとする課題】溶接ビード切削後の形
状は目視判定するのが一般であり、上述の特開昭５７−
１３７０２７号公報では、造管時の成形状態等の影響を
大きく受け精度良く計測することは不可能である。In general, the shape after cutting a weld bead is visually determined.
According to Japanese Patent Publication No. 137027, it is impossible to measure with high accuracy due to the influence of the molding state or the like at the time of pipe making.
【０００４】[0004]
【課題を解決するための手段】本発明の要旨は、電縫管
の溶接ビード切削後の形状を計測する際にスリット光と
ＩＴＶカメラによる光切断方法をもって鋼管ビード切削
部の映像を捕らえその断面形状映像を細線化処理し断面
形状を算出しその断面形状の輝度により切削部と非切削
部である母材とを区別しビード切削形状を測定すること
を特徴とする電縫管溶接ビード切削形状計測方法であ
る。即ち、本発明はスリット光を照射しＩＴＶカメラを
用いて切削直後のビード形状を光切断方法により求める
にとどまらず切削部の断面形状を切削部と非切削部であ
る母材との輝度差から切削部の断面形状を精度良く計測
できるようにしたものである。SUMMARY OF THE INVENTION The gist of the present invention is to provide a method for measuring the shape of an ERW pipe after cutting a weld bead by capturing an image of a steel pipe bead cutting portion using a slit light and a light cutting method using an ITV camera. An ERW pipe weld bead cutting shape characterized by thinning processing of a shape image, calculating a cross-sectional shape, distinguishing a cutting portion from a base material as a non-cutting portion based on the brightness of the cross-sectional shape, and measuring a bead cutting shape. It is a measurement method. That is, the present invention irradiates slit light and uses an ITV camera to determine the bead shape immediately after cutting by the light cutting method, and also determines the cross-sectional shape of the cut portion from the difference in luminance between the base material as the cut portion and the non-cut portion. The cross-sectional shape of the cutting part can be measured with high accuracy.
【０００５】[0005]
【作用】以下、図１及び図２を参照して本発明を説明す
る。図１（ａ）は光切断画像から図２におけるｙ軸方向
の最大輝度をｘ軸に沿ってプロットして細線化処理する
ことで得られる。この状態では何処が切削部分であるか
定かではない。そこで、図１（ａ）の波形上の輝度状態
を図１（ａ）と同様にｘ軸に沿ってプロットしたのが図
１（ｂ）である。切削部分の輝度は低下するため図１
（ｂ）において輝度の下がっている範囲を算出すれば切
削部となる。その方法としては、例えば図１（ｃ）のご
とくｘ軸方向に図１（ｂ）の波形を微分すれば図１
（ｃ）となる。この図１（ｃ）上の最大値と最小値との
間が切削部分となり、この結果を用いればビード切削形
状計測は容易に行うことができる。つまり、例えば図１
（ａ）の形状波形を母材部、切削部、母材部の３つの区
間に分け各々の区間毎に最小２乗近似等を行うことで図
１（ｄ）のようなパラメータすなわち計測値が得られ
る。The present invention will be described below with reference to FIGS. FIG. 1A is obtained by plotting the maximum luminance in the y-axis direction in FIG. 2 along the x-axis from the light-section image and performing thinning processing. In this state, it is not clear where the cut portion is. Therefore, FIG. 1B is a plot of the luminance state on the waveform of FIG. 1A along the x-axis as in FIG. 1A. Fig. 1
If a range in which the luminance is reduced in (b) is calculated, the area becomes a cutting portion. As a method thereof, for example, if the waveform of FIG. 1B is differentiated in the x-axis direction as shown in FIG.
(C). The portion between the maximum value and the minimum value in FIG. 1C is a cutting portion, and the bead cutting shape can be easily measured by using this result. That is, for example, FIG.
By dividing the shape waveform of (a) into three sections of a base material portion, a cutting portion, and a base material portion and performing least square approximation or the like for each of the sections, the parameter as shown in FIG. can get.
【０００６】すなわち、図１（ｄ）のｈ1は左側母材の
境界点の高さ、ｈ2は切削部の左側境界点の高さ、ｈ3は
切削部の右側境界点の高さ、ｈ4は右側母材の境界点の
高さ、ｈ5は切削部中央付近の最も深く切削した位置で
の高さである。従って、形状波形は左側母材部ｈ1と切
削部ｈ2，ｈ3，ｈ5と右側母材部ｈ4とに区分される。 切削部右端の値＝ｈ2−ｈ1 切削部左端の値＝ｈ3−ｈ4 得られた計測値から 切削深さ＝ｈ5−（ｈ1＋ｈ2）／２ 切削傾き＝（ｈ1−ｈ2）−（ｈ3−ｈ4） 等の切削状態を把握した計測値を算出することができ
る。That is, in FIG. 1D, h 1 is the height of the boundary point of the left base material, h 2 is the height of the left boundary point of the cutting portion, h 3 is the height of the right boundary point of the cutting portion, h 4 is the height of the boundary points of the right matrix, h 5 is the height of the most deeply cut position near the cutting portion center. Therefore, the shape waveform is divided into a left base metal h 1 and the cutting portion h 2, h 3, h 5 and the right base metal h 4. Cutting unit rightmost value = h 2 -h 1 cutting unit leftmost value = h 3 -h 4 resulting cutting depth from the measured value = h 5 - (h 1 + h 2) / 2 cut slope = (h 1 - h 2) - (h 3 -h 4) the measured value obtained by grasping the cutting conditions such as can be calculated.
【０００７】[0007]
【実施例】図３を参照しながら本発明を鋼管の内面切削
ビード形状計測に適用した実施例を説明する。肉厚５．
６ｍｍ、外径１３９．８ｍｍの鋼管を図３に示す如く、
マンドレル５に固定したスリット投光器１により、スリ
ット光を鋼管内面のビード部に入射角度８０°にて照射
した。この照射したスリット光をＩＴＶカメラ２にて視
野サイズ３０ｍｍ×３０ｍｍにて撮像した。その撮像し
た画像信号を画像処理装置１０へ入力し、該画像処理装
置内メモリは５１２画素×５１２画素とした。得られた
プロフィール（Ｘ）と実像（Ｙ）との関係は、スリット
光の入射角をθとした場合、Ｙ＝Ｘ・ｔａｎ（９０°−
θ）の関係があり、計測上の分解能は１画素あたり、 となる。該画像処理装置１０において、その画像を細線
し、断面形状の輝度により切削部と非切削部を区別し
（参考写真を参照）切削部中央値、切削部右端の値、切
削部左端の値を求めた。その結果、切削部の計測値は切
削部中央値：＋０．２３ｍｍ、切削部右端の値：＋０．
２６ｍｍ、切削部左端の値：＋０．２１ｍｍであった。
また、造管後、鋼管をサンプリングし、切削部を検鏡し
て切削部の深さを測定した。その結果、切削部中央値：
＋０．２０ｍｍ、切削部右端の値：＋０．３２ｍｍ、切
削部左端の値：＋０．１８ｍｍであった。このように本
発明の電縫管溶接ビード切削形状計測方法によれば、実
際の切削深さとは０．０３ｍｍ〜０．０６ｍｍの範囲内
に入り、極めて精度良く計測することができた。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to the measurement of the shape of a bead on the inner surface of a steel pipe will be described with reference to FIG. 4. Thickness
As shown in FIG. 3, a steel pipe having a diameter of 6 mm and an outer diameter of 139.8 mm
The slit light emitted from the slit projector 1 fixed to the mandrel 5 was applied to the bead portion on the inner surface of the steel pipe at an incident angle of 80 ° . Viewing the irradiated slit light by ITV camera 2
An image was taken at a field size of 30 mm × 30 mm . The captured image signal is input to the image processing device 10 and the image processing device
The internal memory was 512 pixels × 512 pixels. Got
The relationship between profile (X) and real image (Y) is
When the incident angle of light is θ, Y = X · tan (90 ° −
θ), and the resolution in measurement is per pixel , Becomes In the image processing apparatus 10, the image is thinned, and the cut portion and the non-cut portion are distinguished by the brightness of the cross-sectional shape (refer to the reference photograph). The median value of the cut portion, the value of the right end of the cut portion, and the value of the left end of the cut portion are calculated. I asked. As a result, the measured value of the cut portion was the median value of the cut portion: +0.23 mm, and the value at the right end of the cut portion: +0.
26 mm, value at the left end of the cut portion: +0.21 mm.
Further, after pipe formation, the steel pipe was sampled, and the depth of the cut part was measured by microscopic examination of the cut part. As a result, the median cutting part:
+0.20 mm, value at the right end of the cutting portion: +0.32 mm, and value at the left end of the cutting portion: +0.18 mm. As described above, according to the ERW pipe weld bead cutting shape measuring method of the present invention, the actual cutting depth falls within the range of 0.03 mm to 0.06 mm, and the measurement can be performed with extremely high accuracy.
【０００８】[0008]
【発明の効果】ビード切削部を正確に求めることによ
り、切削形状を精度良く求めることができる。品質保証
のみならず、自動制御と組み合わせることで高精度のビ
ード切削が可能となる。The cutting shape can be obtained with high accuracy by accurately obtaining the bead cutting portion. In addition to quality assurance, high-precision bead cutting is possible by combining with automatic control.
【図１】本発明の作用の手順を説明する図、FIG. 1 is a diagram illustrating a procedure of an operation of the present invention;
【図２】光切断法の原理を説明する図、FIG. 2 is a diagram illustrating the principle of the light section method;
【図３】本発明を鋼管の内削ビード切削形状計測に応用
した実施例である。FIG. 3 is an embodiment in which the present invention is applied to internal cutting bead cutting shape measurement of a steel pipe.
１ スリット光投光器 ２ ＩＴＶカメラ ３ スリット光 ４ 被測定面 ５ マンドレル ６ 切削バイト ７ マンドレル支持上コロ ８ マンドレル支持下コロ ９ 鋼管 １０ 画像処理装置 DESCRIPTION OF SYMBOLS 1 Slit light projector 2 ITV camera 3 Slit light 4 Surface to be measured 5 Mandrel 6 Cutting bit 7 Mandrel supporting upper roller 8 Mandrel supporting lower roller 9 Steel pipe 10 Image processing device
Claims (1)
する際にスリット光とＩＴＶカメラによる光切断方法を
持って鋼管ビード切削部の映像を捕らえる溶接ビード切
削形状計測方法においてその断面形状映像を細線化処理
し断面形状を算出しその断面形状の輝度により切削部と
非切削部である母材とを区別し、その区別した切削部中
央値と切削部右端の値と切削部左端の値とを求め、この
三つの計測値をもとに左右計測値と母材中央値とをもっ
て切削深さ量を算出し左右計測値をもって切削傾き量を
算出することでビード切削形状を精度良く測定できるこ
とを特徴とする電縫管溶接ビード切削形状計測方法。1. A method for measuring the shape of an ERW pipe after cutting a weld bead, using a slit light and a light cutting method using an ITV camera to capture an image of a steel pipe bead cutting portion. The image is thinned to calculate the cross-sectional shape, and the brightness of the cross-sectional shape is used to distinguish between the cutting portion and the base material that is the non-cutting portion. The bead cutting shape is accurately measured by calculating the cutting depth using the left and right measurement values and the base metal median value based on these three measurement values, and calculating the cutting inclination using the left and right measurement values. A method for measuring a weld bead cutting shape of an ERW pipe, wherein the method comprises:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3273449A JP2618303B2 (en) | 1991-09-26 | 1991-09-26 | ERW pipe welding bead cutting shape measurement method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3273449A JP2618303B2 (en) | 1991-09-26 | 1991-09-26 | ERW pipe welding bead cutting shape measurement method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05138427A JPH05138427A (en) | 1993-06-01 |
| JP2618303B2 true JP2618303B2 (en) | 1997-06-11 |
Family
ID=17528070
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3273449A Expired - Lifetime JP2618303B2 (en) | 1991-09-26 | 1991-09-26 | ERW pipe welding bead cutting shape measurement method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2618303B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012157882A (en) * | 2011-01-31 | 2012-08-23 | Jfe Steel Corp | Illumination device for detecting cut part of weld bead |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| MY137246A (en) | 2002-04-30 | 2009-01-30 | Jfe Steel Corp | Method and instrument for measuring bead cutting shape of electric welded tube |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57108705A (en) * | 1980-12-26 | 1982-07-06 | Kawasaki Steel Corp | Method and device for monitor of bead cut form at welded part on inner surface of welded tube |
| JPS601138B2 (en) * | 1981-02-20 | 1985-01-12 | 日本鋼管株式会社 | How to determine the cutting status of the inner bead of an ERW welded pipe |
| JPS6242755A (en) * | 1985-08-16 | 1987-02-24 | Nishihara Environ Sanit Res Corp | Centrifugal concentrator |
-
1991
- 1991-09-26 JP JP3273449A patent/JP2618303B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012157882A (en) * | 2011-01-31 | 2012-08-23 | Jfe Steel Corp | Illumination device for detecting cut part of weld bead |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05138427A (en) | 1993-06-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP1500904B1 (en) | Method of and device for measuring bead cutting shape of electric welded tube | |
| JP4705479B2 (en) | Bead shape detection method and apparatus | |
| JP3373831B2 (en) | Test specimen elongation measuring method and apparatus | |
| KR102056076B1 (en) | Apparatus for weld bead detecting and method for detecting welding defects of the same | |
| WO1985005675A1 (en) | Vehicle for evaluating properties of road surfaces | |
| JPH0555802B2 (en) | ||
| JPH06147863A (en) | Bending angle detector for bending machine | |
| JP2923199B2 (en) | Bending angle detecting device, straight line extracting device used therefor, and bending angle detecting position setting device | |
| JP2618303B2 (en) | ERW pipe welding bead cutting shape measurement method | |
| JP5042503B2 (en) | Defect detection method | |
| JP3324809B2 (en) | Measurement point indicator for 3D measurement | |
| JPH11502936A (en) | Glass container inspection method | |
| JP2572286B2 (en) | 3D shape and size measurement device | |
| JPH04127984A (en) | Method and device for laser welding | |
| JP2004093195A (en) | Weld bead cut shape measuring method of electro-resistance-welded tube and measuring device | |
| JP3152507B2 (en) | Local corrosion depth automatic measurement method | |
| JP2007108002A (en) | Three-dimensional shape measuring device using optical cutting method, and three-dimensional shape measuring method | |
| JP2872481B2 (en) | How to measure groove dimensions | |
| JP2600567B2 (en) | Pipe end processing section size measurement device | |
| JPH06294748A (en) | Surface flaw inspection method at welded part of uo steel pipe | |
| JP2928375B2 (en) | Image processing device | |
| JP3013255B2 (en) | Shape measurement method | |
| JPH07218227A (en) | Method and apparatus for measuring sectional shape | |
| JPH07128243A (en) | Inspection method and inspection device | |
| JPH03186705A (en) | Three-dimensional shape dimension measuring instrument |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 19961217 |