JP6050605B2 - Round steel bar flaw detection apparatus and method - Google Patents
Round steel bar flaw detection apparatus and method Download PDFInfo
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- JP6050605B2 JP6050605B2 JP2012105830A JP2012105830A JP6050605B2 JP 6050605 B2 JP6050605 B2 JP 6050605B2 JP 2012105830 A JP2012105830 A JP 2012105830A JP 2012105830 A JP2012105830 A JP 2012105830A JP 6050605 B2 JP6050605 B2 JP 6050605B2
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- 229910000831 Steel Inorganic materials 0.000 title claims description 100
- 239000010959 steel Substances 0.000 title claims description 100
- 238000001514 detection method Methods 0.000 title claims description 37
- 238000000034 method Methods 0.000 title description 15
- 239000000523 sample Substances 0.000 claims description 44
- 230000007547 defect Effects 0.000 claims description 23
- 238000005096 rolling process Methods 0.000 claims description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 13
- 238000007654 immersion Methods 0.000 claims description 6
- 238000005516 engineering process Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
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Description
本発明は、アレイ探触子を用いた水浸超音波探傷による丸棒鋼探傷装置及びその方法に関するものである。 The present invention relates to a round bar steel flaw detector and a method thereof by water immersion ultrasonic flaw detection using an array probe.
特殊鋼からなる丸棒鋼は、鋼片が圧延されることで得られる。通常は、タンデムに並べられた粗列圧延機、中間列圧延機及び仕上列圧延機による多段圧延が施される。この圧延によって鋼片は徐々に細径化し且つ長尺化して、丸棒鋼が得られる。ユーザーの要求によっては、圧延によって得られた丸棒鋼に、さらに、熱処理、ピーリング加工などを施して丸棒鋼（成品）とする。 Round steel bar made of special steel is obtained by rolling a steel piece. Usually, multi-stage rolling is performed by a rough row rolling mill, a middle row rolling mill, and a finishing row rolling mill arranged in tandem. By this rolling, the steel slab is gradually reduced in diameter and lengthened to obtain a round bar steel. Depending on the user's request, the round bar steel obtained by rolling is further subjected to heat treatment, peeling processing, etc. to obtain round bar steel (product).
このように製造される丸棒鋼には中心部に欠陥が存在することがある。欠陥の大きさや数によっては丸棒鋼の品質を損なうため、丸棒鋼の用途にあわせた欠陥の検査を行い、高品質の丸棒鋼のみを出荷する必要がある。また、欠陥の実寸法(√AREA)は数100μm以下であるが、そのうち特に大きな100μm級またはそれ以上の寸法の欠陥を精度よく検出する必要がある。なお、√AREAとは、観察する方向からみたときの欠陥の面積の平方根であって、検知された欠陥の長辺をＡ、短辺をＢとした場合において、√AREA＝√(Ａ×Ｂ)とするのが一般的である。ここで、短辺（Ｂ）方向は長辺（Ａ）方向と直交するようにとる。√AREAとは、欠陥を等価の長方形に見立てて平均径を求める方法である。 The round steel bar manufactured in this way may have a defect in the center. Depending on the size and number of defects, the quality of the round bar steel is impaired. Therefore, it is necessary to inspect the defect according to the application of the round bar steel and to ship only high quality round bar steel. In addition, the actual dimension (√AREA) of the defect is several hundreds μm or less, and it is necessary to accurately detect a defect having a particularly large dimension of 100 μm or more. Note that √AREA is the square root of the area of the defect when viewed from the direction of observation, and when the long side of the detected defect is A and the short side is B, √AREA = √ (A × B ). Here, the short side (B) direction is set to be orthogonal to the long side (A) direction. √AREA is a method for determining the average diameter by regarding defects as an equivalent rectangle.
丸棒鋼の欠陥の代表的な検査方法には、例えば、アレイ探触子とこのアレイ探触子に接続された制御盤とを備える装置において、アレイ探触子は丸棒鋼の周りを相対的に回転し、丸棒鋼はこの丸棒鋼の軸手方向に進行する方法がある（例えば、特許文献１参照）。このフェイズドアレイ技術を用いる装置によれば、回転とピッチ送りを同時に行い探傷を行うスパイラル走査（図３（ａ））、もしくは、アレイ探触子は固定され電子走査を行うと共に、丸棒鋼を１回転させて探傷を行いその後軸方向に１ピッチ送りする送り走査（図３（ｂ））などの機械走査が行われる。 A typical method for inspecting a defect in a round bar steel is, for example, in an apparatus including an array probe and a control panel connected to the array probe, the array probe relatively moves around the round bar steel. There is a method in which the round bar steel advances in the axial direction of the round bar steel (see, for example, Patent Document 1). According to the apparatus using this phased array technology, spiral scanning (FIG. 3A) in which flaw detection is performed by rotating and pitch feeding simultaneously, or the array probe is fixed and electronic scanning is performed, and a round bar steel is A mechanical scan such as a feed scan (FIG. 3B) is performed by rotating the flaw for flaw detection and then feeding it by one pitch in the axial direction.
しかしながら、上述した従来の走査方法ではアレイ探触子の電子走査方向(アレイ素子配列方向)と機械走査方向が同じであるため、アレイ技術を生かせなかった。つまり、機械走査のみの探傷であるため探傷に時間が必要となり、迅速な評価が困難であった。 However, the conventional scanning method described above cannot utilize the array technology because the electronic scanning direction (array element arrangement direction) of the array probe is the same as the mechanical scanning direction. That is, since the flaw detection is performed only by mechanical scanning, time is required for flaw detection, and quick evaluation is difficult.
本発明は、このような従来の問題を解決するためになされたもので、超音波探傷による迅速な欠陥検出が可能な丸棒鋼探傷装置及びその方法を提供することである。 The present invention has been made to solve such a conventional problem, and it is an object of the present invention to provide a round bar steel flaw detection apparatus and a method thereof capable of quick defect detection by ultrasonic flaw detection.
本発明は、水浸超音波探傷により丸棒鋼内の欠陥を検出する丸棒鋼探傷装置であって、丸棒鋼と所定の間隔をおいて備わり、丸棒鋼の圧延方向と垂直な方向に電子走査を行う円弧状の電子走査式アレイ探触子と、円弧状の電子走査式アレイ探触子を丸棒鋼の圧延方向に所定のピッチで機械走査させるアレイ探触子移動部と、を有し、丸棒鋼の所定の領域について、円弧状の電子走査式アレイ探触子の電子走査方向と円弧状の電子走査式アレイ探触子の機械走査方向とを垂直とし、電子走査と所定のピッチの機械走査を交互に行う探傷を行い、丸棒鋼を所定の角度で丸棒鋼の軸を中心に回転させる回転駆動部をさらに有し、丸棒鋼の所定の領域について探傷を行った後に、丸棒鋼を所定の角度で回転させ、丸棒鋼の他の領域についても探傷を行うことを特徴とする。
The present invention relates to a round bar steel flaw detection apparatus for detecting defects in a round bar steel by water immersion ultrasonic flaw detection, which is provided with a predetermined distance from the round bar steel and performs electronic scanning in a direction perpendicular to the rolling direction of the round bar steel. An arc-shaped electronic scanning array probe to be performed, and an array probe moving unit that mechanically scans the arc-shaped electronic scanning array probe at a predetermined pitch in the rolling direction of the round steel bar. With respect to a predetermined area of the steel bar, the electronic scanning direction of the arc-shaped electronic scanning array probe is perpendicular to the mechanical scanning direction of the arc-shaped electronic scanning array probe, and the electronic scanning and the mechanical scanning of a predetermined pitch are performed. Are further provided with a rotation drive unit that rotates the round bar steel around the axis of the round bar steel at a predetermined angle, and after performing a flaw detection on a predetermined region of the round bar steel, Rotate at an angle and perform flaw detection in other areas of round steel bars It is characterized in.
また、本発明は、水浸超音波探傷により丸棒鋼内の欠陥を検出する丸棒鋼探傷方法であって、丸棒鋼と所定の間隔をおいて備わる円弧状の電子走査式アレイ探触子により、丸棒鋼の圧延方向と垂直な方向に電子走査を行い、円弧状の電子走査式アレイ探触子を前記丸棒鋼の圧延方向に所定のピッチで機械走査を行って、丸棒鋼の所定の領域について、円弧状の電子走査式アレイ探触子の電子走査の方向と円弧状の電子走査式アレイ探触子の機械走査の方向とを垂直とし、電子走査と所定のピッチの機械走査を交互に行う探傷を行い、丸棒鋼を所定の角度で丸棒鋼の軸を中心に回転させ、丸棒鋼の他の領域についても探傷をさらに行うことを特徴とする。 Further, the present invention is a round bar steel flaw detection method for detecting a defect in a round bar steel by water immersion ultrasonic flaw detection, wherein the arc-shaped electronic scanning array probe provided with a predetermined interval from the round bar steel, Electronic scanning is performed in a direction perpendicular to the rolling direction of the round bar steel, and the arc-shaped electronic scanning array probe is mechanically scanned at a predetermined pitch in the rolling direction of the round bar steel, and a predetermined region of the round bar steel is obtained. The electronic scanning direction of the arc-shaped electronic scanning array probe and the mechanical scanning direction of the arc-shaped electronic scanning array probe are perpendicular to each other, and the electronic scanning and the mechanical scanning at a predetermined pitch are alternately performed. A flaw detection is performed, the round bar steel is rotated around a shaft of the round bar steel at a predetermined angle, and the flaw detection is further performed on other regions of the round bar steel .
本発明の丸棒鋼探傷装置及びその方法によれば、欠陥の探傷を迅速に行うことが可能となる。 According to the round bar steel flaw detection apparatus and the method of the present invention, it becomes possible to perform flaw detection quickly.
以下、本発明の実施形態である丸棒鋼探傷装置及びその方法について、図を参照して詳細に説明をする。 Hereinafter, a round bar steel flaw detection apparatus and method according to an embodiment of the present invention will be described in detail with reference to the drawings.
図１は、本実施形態の丸棒鋼探傷装置の構成を示す図である。図１（ａ）は、本実施形態の丸棒鋼探傷装置を丸棒鋼のＴ断面で見た図であり、図１（ｂ）は、本実施形態の丸棒鋼探傷装置の正面図である。 FIG. 1 is a diagram showing a configuration of a round bar steel flaw detector according to this embodiment. Fig.1 (a) is the figure which looked at the round bar steel flaw detector of this embodiment in the T cross section of round bar steel, and FIG.1 (b) is a front view of the round bar steel flaw detector of this embodiment.
本実施形態の丸棒鋼探傷装置１００は、制御部１０と、アレイ探触子（電子走査式アレイ探触子）２０とから構成される。 The round bar steel flaw detector 100 according to this embodiment includes a control unit 10 and an array probe (electronic scanning type array probe) 20.
制御部１０は、例えば、パーソナルコンピュータ等で構成される。 The control unit 10 is constituted by, for example, a personal computer.
検査対象となる丸棒鋼Ａは、水槽３０にセットされる。また、水槽３０内は水４０で満たされている。そして、水槽３０内の丸棒鋼Ａ全体が水４０に完全に浸ることにより、本実施形態の丸棒鋼探傷装置１００は、いわゆる水浸法による超音波探傷を行うことが可能である。 The round steel bar A to be inspected is set in the water tank 30. The water tank 30 is filled with water 40. And when the whole round bar steel A in the water tank 30 is completely immersed in the water 40, the round bar steel flaw detector 100 of this embodiment can perform the ultrasonic flaw detection by what is called a water immersion method.
また、本実施形態の丸棒鋼探傷装置１００には、丸棒鋼を回転させる不図示のターニングローラー等の回転機構が付設されており、丸棒鋼Ａを図１中のＤ2方向へ所定の角度で回転させる。 Further, the round bar steel flaw detector 100 of the present embodiment is provided with a rotation mechanism such as a turning roller (not shown) for rotating the round bar steel, and rotates the round bar A at a predetermined angle in the direction D2 in FIG. Let
アレイ探触子２０の丸棒鋼Ａに対向する面には、略円周面状の探触子面２０ａが形成されている。 A substantially circumferential probe surface 20 a is formed on the surface of the array probe 20 facing the round steel bar A.
アレイ探触子２０には、アレイ探触子２０を丸棒鋼の軸方向（圧延方向）に往復動させる不図示の移動機構が付設されており、アレイ探触子２０を図１中のＤ1方向へ往復動させる。また、アレイ探触子２０の電子走査の方向を図１中のＤ3で示す。アレイ探触子２０は図１中のＤ3方向に電子走査を行うことにより、鋼中の欠陥を検知する。 The array probe 20 is provided with a moving mechanism (not shown) that reciprocates the array probe 20 in the axial direction (rolling direction) of the round steel bar. The array probe 20 is moved in the direction D1 in FIG. Move back and forth. The direction of electronic scanning of the array probe 20 is indicated by D3 in FIG. The array probe 20 detects defects in the steel by electronic scanning in the direction D3 in FIG.
図からわかるように、本実施形態において、アレイ探触子２０の電子走査の方向Ｄ3と、アレイ探触子２０を往復動させる機械走査の方向Ｄ1とは垂直となる。 As can be seen, in the present embodiment, the electronic scanning direction D3 of the array probe 20 and the mechanical scanning direction D1 for reciprocating the array probe 20 are perpendicular to each other.
アレイ探触子２０の電子走査及び往復動作及び丸棒鋼の回転動作は制御部１０で制御され、制御部１０は、アレイ探触子２０で検知された欠陥信号のすべてを総合して、丸棒鋼Ａ内の欠陥検出位置のマップなどを作成する。 The electronic scanning and reciprocating operation of the array probe 20 and the rotating operation of the round bar steel are controlled by the control unit 10, and the control unit 10 combines all the defect signals detected by the array probe 20 to obtain a round bar steel. A map of defect detection positions in A is created.
次に、本実施形態の丸棒鋼探傷装置の動作について説明をする。図２は、本実施形態の丸棒鋼探傷装置の動作を説明する図である。 Next, operation | movement of the round bar steel flaw detector of this embodiment is demonstrated. FIG. 2 is a view for explaining the operation of the round steel bar flaw detector according to this embodiment.
なお、以下の説明では、丸棒鋼Ａを断面Ａ1、Ａ2、Ａ3、Ａ4を各々軸方向に延伸した４つの部分に分けて探傷動作を行う例で説明を行うが、断面の分割数はこれに限られるものではなく、アレイ探触子の電子走査範囲に応じて適宜変更すればよい。 In the following description, the round steel bar A will be described as an example in which the flaw detection operation is performed by dividing the cross section A1, A2, A3, and A4 into four portions each extending in the axial direction. It is not limited, and may be appropriately changed according to the electronic scanning range of the array probe.
まず、本実施形態の丸棒鋼探傷装置では、アレイ探触子２０が、所定位置においてＤ3方向に電子走査を行い、当該所定位置の丸棒鋼の欠陥を検出する。 First, in the round bar steel flaw detector according to the present embodiment, the array probe 20 performs electronic scanning in the D3 direction at a predetermined position to detect a defect in the round bar steel at the predetermined position.
次に、アレイ探触子２０をＤ1の方向１に１ピッチ送り、この位置においてＤ3方向に電子走査を行い、当該所定位置の丸棒鋼の欠陥を検出する。 Next, the array probe 20 is fed one pitch in the direction 1 of D1, and electronic scanning is performed in the direction D3 at this position to detect defects in the round bar steel at the predetermined position.
以後、この動作を丸棒鋼Ａの右端まで繰り返し、丸棒鋼Ａの断面Ａ1領域についての探傷が完了する。 Thereafter, this operation is repeated up to the right end of the round steel bar A, and the flaw detection on the cross section A1 region of the round steel bar A is completed.
次に、丸棒鋼ＡをＤ2の方向２に所定の角度回転させ、当該位置においてＤ3方向に電子走査を行い、当該所定位置の丸棒鋼の欠陥を検出する。 Next, the round steel bar A is rotated by a predetermined angle in the direction 2 of D2, and electronic scanning is performed in the D3 direction at the position to detect defects in the round bar steel at the predetermined position.
次に、アレイ探触子２０をＤ1の方向３に１ピッチ送り、この位置においてＤ3方向に電子走査を行い、当該所定位置の丸棒鋼の欠陥を検出する。 Next, the array probe 20 is fed one pitch in the direction 3 of D1, and electronic scanning is performed in the direction D3 at this position to detect a defect in the round bar steel at the predetermined position.
以後、この動作を丸棒鋼Ａの左端まで繰り返し、丸棒鋼Ａの断面Ａ2領域についての探傷が完了する。 Thereafter, this operation is repeated until the left end of the round steel bar A, and the flaw detection on the cross section A2 region of the round steel bar A is completed.
以後、丸棒鋼ＡをＤ2の方向４に所定の角度回転させ、同様の探傷動作を丸棒鋼Ａの断面Ａ3、Ａ4領域についても行う。 Thereafter, the round steel bar A is rotated by a predetermined angle in the direction 4 of D2, and the same flaw detection operation is performed on the cross sections A3 and A4 of the round steel bar A.
（実験例）
φ80×250mmL棒鋼中の√Area100μm級欠陥を検出する条件で探傷を行った。従来走査方法(送り走査)では、探傷時間が15minであったものが、本実施形態の丸棒鋼探傷装置及びその方法では1.75minまで短縮された。よって、本実施形態の丸棒鋼探傷装置及びその方法の有効性が確認された。
(Experimental example)
The flaw detection was performed under the condition to detect √Area100μm class defects in φ80 × 250mmL steel bar. In the conventional scanning method (feed scanning), the flaw detection time was 15 minutes, but in the round bar steel flaw detection apparatus and method according to the present embodiment, it was reduced to 1.75 min. Therefore, the effectiveness of the round bar steel flaw detector and the method of this embodiment was confirmed.
以上説明したように、本実施形態の丸棒鋼探傷装置及びその方法によれば、アレイ探触子２０の電子走査の方向Ｄ3と、アレイ探触子２０の機械走査の方向Ｄ1とを垂直の関係とすることにより、欠陥の探傷を迅速に行うことが可能となる。 As described above, according to the round bar steel flaw detector and method of the present embodiment, the electronic scanning direction D3 of the array probe 20 and the mechanical scanning direction D1 of the array probe 20 are perpendicular to each other. By doing so, it becomes possible to quickly detect defects.
１００：本実施形態の丸棒鋼探傷装置
１０：制御部
２０：アレイ探触子ユニット
３０：水槽
４０：水
100: Round bar steel flaw detector 10 of this embodiment 10: Control unit 20: Array probe unit 30: Water tank 40: Water
Claims (2)
前記丸棒鋼と所定の間隔をおいて備わり、前記丸棒鋼の圧延方向と垂直な方向に電子走査を行う円弧状の電子走査式アレイ探触子と、
前記円弧状の電子走査式アレイ探触子を前記丸棒鋼の圧延方向に所定のピッチで機械走査させるアレイ探触子移動部と、を有し、
前記丸棒鋼の所定の領域について、前記円弧状の電子走査式アレイ探触子の電子走査方向と前記円弧状の電子走査式アレイ探触子の機械走査方向とを垂直とし、前記電子走査と前記所定のピッチの機械走査を交互に行う探傷を行い、
前記丸棒鋼を所定の角度で前記丸棒鋼の軸を中心に回転させる回転駆動部をさらに有し、
前記丸棒鋼の所定の領域について探傷を行った後に、前記丸棒鋼を所定の角度で回転させ、前記丸棒鋼の他の領域についても探傷を行うことを特徴とする丸棒鋼探傷装置。 A round bar steel flaw detector for detecting defects in a round bar steel by water immersion ultrasonic flaw detection,
An arc-shaped electronic scanning array probe which is provided with a predetermined interval from the round steel bar and performs electronic scanning in a direction perpendicular to the rolling direction of the round steel bar,
An array probe moving unit that mechanically scans the arc-shaped electronic scanning array probe at a predetermined pitch in the rolling direction of the round bar steel,
For a given area of the round bar steel, the mechanical scan direction of the arc-shaped electronic scanning array probe of an electronic scanning direction and the arc-shaped electronic scanning array probe and vertical, the said electronic scanning There line flaw detection alternately perform mechanical scanning of a predetermined pitch,
A rotation drive unit for rotating the round bar steel around a shaft of the round bar steel at a predetermined angle;
Wherein after the flaw for a given area of the round bar steel, the round bar steel was rotated at a predetermined angle, other areas round bar steel flaw detection apparatus according to claim row Ukoto also flaw for the round bar steel.
前記丸棒鋼と所定の間隔をおいて備わる円弧状の電子走査式アレイ探触子により、前記丸棒鋼の圧延方向と垂直な方向に電子走査を行い、前記円弧状の電子走査式アレイ探触子を前記丸棒鋼の圧延方向に所定のピッチで機械走査を行って、前記丸棒鋼の所定の領域について、前記円弧状の電子走査式アレイ探触子の前記電子走査の方向と前記円弧状の電子走査式アレイ探触子の前記機械走査の方向とを垂直とし、前記電子走査と前記所定のピッチの機械走査を交互に行う探傷を行い、
前記丸棒鋼の所定の領域について探傷を行った後に、前記丸棒鋼を所定の角度で前記丸棒鋼の軸を中心に回転させ、前記丸棒鋼の他の領域についても探傷をさらに行うことを特徴とする丸棒鋼探傷方法。
A round bar steel flaw detection method for detecting defects in a round bar steel by water immersion ultrasonic flaw detection,
An arc-shaped electronic scanning array probe provided at a predetermined interval from the round bar steel performs electronic scanning in a direction perpendicular to the rolling direction of the round bar steel, and the arc-shaped electronic scanning array probe. wherein performing mechanical scanning with a predetermined pitch in the rolling direction of the round bar steel, said for a given area of the round bar steel, and the direction of electronic scanning of the arc-shaped electronic scanning array probe of the arcuate electronic a direction of the mechanical scanning of the scanning array probe and vertical, have rows flaw detection for performing mechanical scanning of the predetermined pitch and the electronic scanning alternately,
After the flaw for a given area of the round bar steel, the round bar steel is rotated about the axis of the round bar steel at a predetermined angle, characterized in further rows Ukoto flaw detection for the other regions of the round bar steel Round bar steel flaw detection method.
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