JPH04157005A - Method for detecting generation of thickness deviation of seamless tube - Google Patents
Method for detecting generation of thickness deviation of seamless tubeInfo
- Publication number
- JPH04157005A JPH04157005A JP2275676A JP27567690A JPH04157005A JP H04157005 A JPH04157005 A JP H04157005A JP 2275676 A JP2275676 A JP 2275676A JP 27567690 A JP27567690 A JP 27567690A JP H04157005 A JPH04157005 A JP H04157005A
- Authority
- JP
- Japan
- Prior art keywords
- shell
- vibration
- amplitude
- elongator
- vibration amplitude
- 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.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims description 14
- 238000005259 measurement Methods 0.000 claims description 10
- 230000002950 deficient Effects 0.000 abstract 2
- 238000010586 diagram Methods 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 239000012467 final product Substances 0.000 description 2
- 210000000481 breast Anatomy 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000007730 finishing process Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 235000013372 meat Nutrition 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
- 239000002436 steel type Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/78—Control of tube rolling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B19/00—Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work
- B21B19/02—Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work the axes of the rollers being arranged essentially diagonally to the axis of the work, e.g. "cross" tube-rolling ; Diescher mills, Stiefel disc piercers or Stiefel rotary piercers
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Control Of Metal Rolling (AREA)
Abstract
Description
【発明の詳細な説明】
[産業上の利用分野〕
この発明は継目無管製造時にエロンゲータ−で発生する
シェルの偏肉を検知する方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for detecting uneven thickness of a shell that occurs in an elongator during seamless pipe manufacturing.
[従来の技術]
継目無管の製造、例えばプラグミルによる継目無管の製
造は、第4図の工程図に示すような工程で製造される。[Prior Art] Manufacturing of seamless pipes, for example, using a plug mill, is carried out through steps as shown in the process diagram of FIG.
すなわち、丸ビレット21が回転式の加熱炉22で所定
の温度まで加熱された後、ピアサ−23においてその中
心部に貫通孔が開けられ、中空素管24が形成される。That is, after the round billet 21 is heated to a predetermined temperature in a rotary heating furnace 22, a through hole is opened in the center of the billet 21 in a piercer 23, and a hollow shell 24 is formed.
この中空素管24は、さらにエロンゲータ−25で中空
部が押し広げられた後、プラグミル26において、半円
状の溝型部を有する上下ロール27とその中央に置かれ
た筒型の芯金(マンドレルバ−)28との間を2〜3パ
ス往復させ、薄肉かっ長尺の継目無管29に仕上げられ
る。After the hollow part of the hollow tube 24 is further expanded by an elongator 25, it is passed to a plug mill 26 using upper and lower rolls 27 having semicircular grooves and a cylindrical core metal ( A thin and long seamless pipe 29 is finished by reciprocating between the pipe and the mandrel bar 28 for 2 to 3 passes.
そして、薄肉かつ長尺の継目無管29はり−ラー30に
かけられ、傾斜した左右2個の円筒状のロー・ル31と
円筒型芯金(マンドレルバ−)32との間を通すことに
より、肉厚の平均化および表面の平滑化が図られる。Then, the thin-walled and long seamless pipe 29 is placed on a girder 30 and passed between two inclined left and right cylindrical rolls 31 and a cylindrical mandrel bar 32. The thickness is averaged and the surface is smoothed.
さらには、サイジングミル33にかけられ、最終的な製
品の形状寸法に仕上げられる。そして、冷却台34で冷
却された後、矯正機35で矯正され、精整工程へと流れ
ていく。このような継目無管の製造工程において、エロ
ンゲータ−25では中空部が大きく拡げられるので、中
空素管24の全周に添って均等にシェルが形成されるの
は難しく、大なり少なりの偏肉が発生する。Furthermore, it is passed through a sizing mill 33 and finished into the shape and dimensions of the final product. Then, after being cooled on a cooling stand 34, it is straightened by a straightening machine 35, and then sent to the finishing process. In the manufacturing process of such a seamless pipe, the hollow part of the Elongator 25 is greatly expanded, so it is difficult to form a shell evenly along the entire circumference of the hollow pipe 24, and it is difficult to form a shell evenly along the entire circumference of the hollow pipe 24. Meat occurs.
このエロンゲータ−25で発生した偏肉は、後工程にお
いて修正することは困難であり、最終製品の偏肉として
残り、品質不良品として処分される。It is difficult to correct the uneven thickness that occurs in the Elongator 25 in a subsequent process, and it remains as an uneven thickness in the final product, which is disposed of as a product of inferior quality.
[発明が解決しようとする課題]
上述したような継目無管に発生した偏肉は、第4図で示
した矯正機35から継目無鋼管を精整ラインに搬送する
ためのコンベアローラーi: 設置してある超音波肉厚
計で肉厚を測定して初めて発見されるという状態であっ
たため、偏肉の発生に気がついた時には数多くの偏肉継
目無鋼管が製造されており、−度に多数の不合格品が発
生するという問題点があった。[Problems to be Solved by the Invention] The uneven thickness that occurs in the seamless pipe as described above can be solved by conveyor roller i for conveying the seamless steel pipe from the straightening machine 35 shown in FIG. 4 to the finishing line. This condition was discovered only after measuring the wall thickness with a conventional ultrasonic wall thickness gauge, so by the time the uneven wall thickness was noticed, many seamless steel pipes with uneven wall thickness had been manufactured, and many were found at one time. There was a problem that some rejected products occurred.
この発明は、従来技術の上記のような問題点を解消し、
継目無管製造時にエロンゲータ−で発生する偏肉を、エ
ロンゲータ−出口で検知することにより、偏肉により不
合格となる継目無鋼管の発生率を低減することのできる
継目無管の偏肉発生検知方法を提供することを目的とし
ている。This invention solves the above-mentioned problems of the prior art,
By detecting the uneven thickness that occurs in the elongator during seamless pipe manufacturing at the elongator outlet, it is possible to reduce the incidence of rejected seamless steel pipes due to uneven thickness.Detection of uneven thickness in seamless pipes. The purpose is to provide a method.
[課題を解決するための手段]
この発明に係る継目無管の偏肉発生検知方法は、エロン
ゲータ−出側の赤熱状態のシェルの振動振幅を一軸CC
Dカメラを使用した測長センサーで連続的に計測し、こ
の計測した振動振幅の信号を振動振幅合否判定手段に送
り、継目無管1本当たりのシェル振動振幅のピーク値の
平均値を演算し、演算した平均値があらかじめ設定され
ているしきい値を超える時には、信号を警報手段に送っ
て警報を発する継目無管の偏肉発生検知方法である。[Means for Solving the Problems] A method for detecting the occurrence of uneven thickness in a seamless pipe according to the present invention is to measure the vibration amplitude of a red-hot shell on the outlet side of an elongator using a uniaxial CC.
A length measurement sensor using a D camera measures the vibration amplitude continuously, and sends the measured vibration amplitude signal to the vibration amplitude pass/fail judgment means, which calculates the average value of the peak value of the shell vibration amplitude per seamless pipe. This is a method for detecting the occurrence of uneven wall thickness in a seamless pipe, in which a signal is sent to an alarm means to issue an alarm when the calculated average value exceeds a preset threshold.
[作用]
この発明に係る継目無管の偏肉発生検知方法は、エロン
ゲータ−出側の赤熱状態のシェルの振動振幅を一軸CC
Dカメラを使用した測長センサーで連続的に計測し、こ
の計測した振動振幅の信号を振動振幅合否判定手段に送
り、継目無管1本当たりのシェル振動振幅のピーク値の
平均値を演算し、演算した平均値があらかじめ設定され
ているしきい値を超える時には、信号を警報手段に送っ
て警報を発するようにしている。このようにしているの
は、次の理由によるものである。すなわち、エロンゲー
タ−で発生する偏肉は、マンドレルバ−の振れ回りに起
因するところが大きい。[Operation] The method for detecting the occurrence of uneven thickness in a seamless pipe according to the present invention is based on the uniaxial CC of the vibration amplitude of the red-hot shell on the outlet side of the elongator.
A length measurement sensor using a D camera measures the vibration amplitude continuously, and sends the measured vibration amplitude signal to the vibration amplitude pass/fail judgment means, which calculates the average value of the peak value of the shell vibration amplitude per seamless pipe. When the calculated average value exceeds a preset threshold, a signal is sent to an alarm means to issue an alarm. This is done for the following reasons. That is, the uneven thickness that occurs in the elongator is largely due to the swinging of the mandrel bar.
したがって、偏肉が発生すると、延伸中の素管のシェル
は上下左右に振動することになる。そこで、偏肉率との
関係を調査した。ここでいうシェルの振動振幅の大きさ
(A)とは、素管】本当たりについて得られる複数の振
幅のピーク値の平均値であり、偏肉率α(%)とは、
(1)式に示す式により定義されるものである。Therefore, when uneven thickness occurs, the shell of the raw pipe being stretched vibrates vertically and horizontally. Therefore, we investigated the relationship with the thickness unevenness rate. The magnitude of the vibration amplitude of the shell (A) here is the average value of the peak values of multiple amplitudes obtained for each shell, and the thickness unevenness rate α (%) is expressed by the formula (1) It is defined by the formula shown below.
α=100 X (t ma、−t、+、)/l、、、
−(1>ただし、tllm、・最大肉厚(m+o)t、
1.:最小肉厚(mad)
fm*m:公称肉厚(am)
調査の結果、第5図に示すようにシェルの振動振幅の大
きさ(A)と偏肉率α(%)との間には、強い相関関係
があることが分かった。α=100 X (t ma, -t, +,)/l,,,
−(1>However, tllm,・maximum wall thickness (m+o)t,
1. : Minimum wall thickness (mad) fm*m: Nominal wall thickness (am) As a result of the investigation, as shown in Figure 5, there is a difference between the magnitude of the vibration amplitude of the shell (A) and the thickness unevenness rate α (%). were found to have a strong correlation.
したがって、シェルの振動振幅を把握しておけば、必然
的に偏肉の発生が検知できることになるのである。Therefore, if you know the vibration amplitude of the shell, you can naturally detect the occurrence of uneven thickness.
また、エロンゲータ−出側でシェルの振動振幅を計測す
るようにしたのは、偏肉が発生した場合、ただちにエロ
ンゲータ−での偏肉発生要因を取り除くことにより、偏
肉のある継目無管は最初の1本のみで、後続する継目無
管には偏肉が発生しないようにできるからである。In addition, the reason for measuring the vibration amplitude of the shell on the exit side of the elongator is that when uneven thickness occurs, by immediately removing the cause of uneven thickness in the elongator, seamless pipes with uneven thickness can be This is because with only one pipe, uneven thickness can be prevented from occurring in the subsequent seamless pipe.
[実施例]
本発明の1実施例の継目無管の偏肉発生検知方法を、第
1図〜第3図により説明する。第1図は、本発明の1実
施例の継目無管の偏肉発生検知方法に使用する機器の構
成を示すブロック図である。−軸CODカメラを使用し
た測長センサ!により、赤熱状態のシェルの振動振幅を
素管1本分連続して計測する。シェルは延伸されると同
時に傾斜ロールにより回転力が与えられているので、振
動振幅の計測は素管の表面をスパイラル状になぞる形で
行われる。したがって、シェルの素管の軸芯と平行な一
断面のみの振幅を計測しているのではなく、素管のあら
ゆる断面の振幅を計測していることになり、素管全体の
偏肉の状態が把握できるのである。[Example] A method for detecting the occurrence of uneven thickness in a seamless pipe according to an example of the present invention will be explained with reference to FIGS. 1 to 3. FIG. 1 is a block diagram showing the configuration of equipment used in a method for detecting uneven thickness of a seamless pipe according to an embodiment of the present invention. -Length measurement sensor using axis COD camera! The vibration amplitude of the red-hot shell is continuously measured for one raw tube. Since the shell is stretched and at the same time a rotational force is applied by an inclined roll, the vibration amplitude is measured by tracing the surface of the raw pipe in a spiral shape. Therefore, we are not measuring the amplitude of only one cross section parallel to the axis of the shell's raw pipe, but are measuring the amplitude of all cross sections of the raw pipe, and the state of uneven thickness of the whole raw pipe. can be grasped.
測長センサlにより計測された振動振幅の大きさの信号
は、コントローラユニット2に送られ、信号の大きさに
比例した電圧出力として振動振幅合否判定演算ユニット
3に送られる。A signal indicating the magnitude of the vibration amplitude measured by the length measurement sensor 1 is sent to the controller unit 2, and is sent to the vibration amplitude pass/fail determination calculation unit 3 as a voltage output proportional to the magnitude of the signal.
振動振幅合否判定演算ユニット3には、エロンゲータ−
の傾斜ロールの回転を検出する、すなわちエロンゲータ
−で素管を延伸中であることを検出する回転検出ユニッ
ト4からの信号が送られてきており、この信号が送られ
てきている闇の複数の振動振幅のピーク値の平均値が演
算される。The vibration amplitude pass/fail judgment calculation unit 3 includes an Elongator
A signal is sent from the rotation detection unit 4, which detects the rotation of the inclined roll of the elongator, that is, detects that the raw pipe is being stretched by the elongator, and this signal is sent from the An average value of the peak values of vibration amplitude is calculated.
また、振動振幅合否判定演算ユニット3には、振動振幅
のしきい値を設定できる設定器5が接続されており、素
管の大きさや鋼種に対応した振動振幅のしきい値を設定
することかできるようになっている。そして、前述した
複数の振動振幅のピーク値の平均値か、設定したしきい
値よりも大きいときには、信号を警報装置6に送って偏
肉が発生したむねの警報をならすようにしている。また
、振動振幅合否判定演算ユニット3にはCRT7が接続
されており、シェルの振動波形を映し出すことができる
ようになっているので、この振動波形からシェルの偏肉
の度合いを判断することもできる。In addition, a setting device 5 that can set a threshold value of vibration amplitude is connected to the vibration amplitude pass/fail judgment calculation unit 3, and it is possible to set a threshold value of vibration amplitude corresponding to the size of the raw pipe and the steel type. It is now possible to do so. Then, when the average value of the peak values of the plurality of vibration amplitudes mentioned above is larger than the set threshold value, a signal is sent to the alarm device 6 to sound an alarm for the breast where uneven thickness has occurred. In addition, a CRT 7 is connected to the vibration amplitude pass/fail judgment calculation unit 3, and the vibration waveform of the shell can be displayed, so the degree of uneven thickness of the shell can be determined from this vibration waveform. .
第2図は、エロンゲータ−で素管を延伸中の赤熱シェル
の上下振動の振幅を、−軸CCDカメラを使用した測長
センサで計測している状態を示す斜視図である。−軸C
CDカメラl!の視野には、赤熱シェル12の軸芯13
と直角方向の一断面のみが入るようになっている。また
、この−断面の上下方向の視野は、下方は前記軸芯!3
よりやや下方であり、上方はシェルの最上端よりもやや
上方までである。FIG. 2 is a perspective view showing a state in which the amplitude of the vertical vibration of the red-hot shell while the raw pipe is being stretched by an elongator is measured by a length measurement sensor using a -axis CCD camera. -Axis C
CD camera! In the field of view, the axis 13 of the red-hot shell 12
Only one cross-section in the direction perpendicular to is included. In addition, the vertical field of view of this cross section is that the downward direction is the axis center! 3
The upper end is slightly above the top of the shell.
一軸CCDカメラ!■に内蔵されたイメージセンサ上に
は、前記視野の部分の映像が結像される。そして、この
信号はコントローラ14i:1.送うれ、さらにはD/
A変換器15でD/A変換され、電圧の大きさとして出
力される。Single axis CCD camera! (2) An image of the field of view is formed on the built-in image sensor. This signal is then transmitted to the controller 14i:1. Send it, and even D/
It is D/A converted by the A converter 15 and output as a voltage magnitude.
第3図は、エロンゲータ−で素管を延伸中の赤熱シェル
12の上下振動の振幅を、−軸CCDカメラ11を使用
した測長センサで計測する原理を示す説明図である。本
計測方式は、赤熱シェル12の上下振動の振幅を計測す
る方式であり、赤熱シェル12の最上面の変動を検出す
るようにしている。FIG. 3 is an explanatory diagram showing the principle of measuring the amplitude of the vertical vibration of the red-hot shell 12 during elongation of the raw pipe with an elongator, using a length measurement sensor using the -axis CCD camera 11. This measurement method is a method of measuring the amplitude of the vertical vibration of the red-hot shell 12, and is designed to detect fluctuations in the uppermost surface of the red-hot shell 12.
赤熱シェル12の軸芯13を通る垂直面に対して平行に
セットされた一軸CCDカメラ11のレンズ系16には
、前記垂直面上り、に対応する暗光源(ハツチ部分)か
らの光と、同じく垂直面上り、に対応する明光源からの
光が入り、イメージセンサ17上にそれぞれ暗部(l3
部分)と明部1、部分)の像が結像される。The lens system 16 of the uniaxial CCD camera 11, which is set parallel to the vertical plane passing through the axis 13 of the red-hot shell 12, receives light from the dark light source (hatched part) corresponding to the vertical plane, and the same light from the dark light source (hatched part). Light from bright light sources corresponding to vertical planes enters, and dark areas (l3
part) and bright part 1, and the image of part) is formed.
イメージセンサ17は、照度に応じた光電出力をするた
め、前記コントローラ14のスレッシュホールドレベル
(THR)で明暗の2値化を行い、明部暗部のイメージ
センサ受光素子数の出力をする。そして、D/A変換器
でイメージセンサ受光素子数に比例した電圧力出力を行
い、L2寸法の変動(シェルの変動)を計測する。In order to output photoelectric power according to the illuminance, the image sensor 17 performs binarization of brightness and darkness using the threshold level (THR) of the controller 14, and outputs the number of light-receiving elements of the image sensor in bright and dark areas. Then, a D/A converter outputs a voltage proportional to the number of light receiving elements of the image sensor, and changes in the L2 dimension (changes in the shell) are measured.
[発明の効果]
この発明により、継目無管製造時にシェルに発生する偏
肉をエロンゲータ−出口で検知でき、偏肉による不合格
品の発生を減少させることができる。[Effects of the Invention] According to the present invention, uneven thickness that occurs in the shell during seamless pipe manufacturing can be detected at the elongator outlet, and the occurrence of rejected products due to uneven thickness can be reduced.
第1図は本発明の1実施例の継目無管の偏肉発生検知方
法を示すブロック図、第2図は赤熱シェルの上下振動の
振幅を測長センサで計測している状態を示す斜視図、第
3図は赤熱シェルの上下振動の振幅を測長センサで計測
する原理を示す説明図、第4図は継目無管の製造工程を
示す工程図、第5図は赤熱シェルの振動振幅の大きさと
偏肉率αとの関係を示すグラフである。
1・・測長センサ、2・・コントローラユニット、3・
・・振動振幅合否判定演算ユニット、4・・・回転検出
ユニット、5 設定器、6・・・信号を警報装置、7・
CRT、11・・−軸CCDカメラ、16・・・レンズ
系16.17・・イメージセンサ。Fig. 1 is a block diagram showing a method for detecting the occurrence of uneven thickness in a seamless pipe according to an embodiment of the present invention, and Fig. 2 is a perspective view showing a state in which the amplitude of vertical vibration of a red-hot shell is measured by a length measurement sensor. , Figure 3 is an explanatory diagram showing the principle of measuring the amplitude of the vertical vibration of the red-hot shell with a length measurement sensor, Figure 4 is a process diagram showing the manufacturing process of seamless pipes, and Figure 5 is an illustration of the vibration amplitude of the red-hot shell. It is a graph showing the relationship between size and thickness unevenness rate α. 1. Length measurement sensor, 2. Controller unit, 3.
... Vibration amplitude pass/fail judgment calculation unit, 4... Rotation detection unit, 5 Setting device, 6... Signal alarm device, 7.
CRT, 11...-axis CCD camera, 16... Lens system 16.17... Image sensor.
Claims (1)
一軸CCDカメラを使用した測長センサーで連続的に計
測し、この計測した振動振幅の信号を振動振幅合否判定
手段に送り、継目無管1本当たりのシェル振動振幅のピ
ーク値の平均値を演算し、演算した平均値があらかじめ
設定されているしきい値を超える時には、信号を警報手
段に送って警報を発することを特徴とする継目無管の偏
肉発生検知方法。The vibration amplitude of the red-hot shell on the exit side of Elongator is continuously measured with a length measurement sensor using a uniaxial CCD camera, and the measured vibration amplitude signal is sent to the vibration amplitude pass/fail judgment means. A seamless pipe characterized in that the average value of the peak values of the shell vibration amplitudes per hit is calculated, and when the calculated average value exceeds a preset threshold value, a signal is sent to an alarm means to issue an alarm. Method for detecting uneven thickness.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2275676A JPH04157005A (en) | 1990-10-15 | 1990-10-15 | Method for detecting generation of thickness deviation of seamless tube |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2275676A JPH04157005A (en) | 1990-10-15 | 1990-10-15 | Method for detecting generation of thickness deviation of seamless tube |
Publications (1)
Publication Number | Publication Date |
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JPH04157005A true JPH04157005A (en) | 1992-05-29 |
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Application Number | Title | Priority Date | Filing Date |
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JP2275676A Pending JPH04157005A (en) | 1990-10-15 | 1990-10-15 | Method for detecting generation of thickness deviation of seamless tube |
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Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006297457A (en) * | 2005-04-22 | 2006-11-02 | Jfe Steel Kk | Method for measuring outside diameter of seamless steel tube |
JP2012127888A (en) * | 2010-12-17 | 2012-07-05 | Sumitomo Light Metal Ind Ltd | Method and apparatus for measuring uneven thickness of metal tube |
US20150350617A1 (en) * | 2014-05-27 | 2015-12-03 | Airbus Group Sas | Method for projecting virtual data and device enabling this projection |
JP2016147300A (en) * | 2015-02-13 | 2016-08-18 | Jfeスチール株式会社 | Thickness deviation generation monitoring method and apparatus in seamless steal tube manufacturing |
-
1990
- 1990-10-15 JP JP2275676A patent/JPH04157005A/en active Pending
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006297457A (en) * | 2005-04-22 | 2006-11-02 | Jfe Steel Kk | Method for measuring outside diameter of seamless steel tube |
JP4725174B2 (en) * | 2005-04-22 | 2011-07-13 | Jfeスチール株式会社 | Method for measuring the outer diameter of seamless steel pipes |
JP2012127888A (en) * | 2010-12-17 | 2012-07-05 | Sumitomo Light Metal Ind Ltd | Method and apparatus for measuring uneven thickness of metal tube |
US20150350617A1 (en) * | 2014-05-27 | 2015-12-03 | Airbus Group Sas | Method for projecting virtual data and device enabling this projection |
US10044996B2 (en) * | 2014-05-27 | 2018-08-07 | Airbus | Method for projecting virtual data and device enabling this projection |
JP2016147300A (en) * | 2015-02-13 | 2016-08-18 | Jfeスチール株式会社 | Thickness deviation generation monitoring method and apparatus in seamless steal tube manufacturing |
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