JP3097253B2 - Ultrasonic flaw detector for band-shaped plate - Google Patents
Ultrasonic flaw detector for band-shaped plateInfo
- Publication number
- JP3097253B2 JP3097253B2 JP03339944A JP33994491A JP3097253B2 JP 3097253 B2 JP3097253 B2 JP 3097253B2 JP 03339944 A JP03339944 A JP 03339944A JP 33994491 A JP33994491 A JP 33994491A JP 3097253 B2 JP3097253 B2 JP 3097253B2
- Authority
- JP
- Japan
- Prior art keywords
- liquid
- ultrasonic
- plate
- band
- shaped plate
- 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 - Fee Related
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/04—Wave modes and trajectories
- G01N2291/044—Internal reflections (echoes), e.g. on walls or defects
Landscapes
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Description
【0001】[0001]
【産業上の利用分野】本発明は、帯状板の超音波探傷装
置に係り、特に、連続的に通板される鋼帯のオンライン
での超音波探傷に用いるのに好適な、連続して通板され
る帯状板の板厚方向に超音波を入射して探傷を行う帯状
板の超音波探傷装置の改良に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultrasonic flaw detector for a strip-shaped plate, and more particularly to a continuous flow flaw detector suitable for use in online ultrasonic flaw detection of a continuously passed steel strip. The present invention relates to an improvement in an ultrasonic flaw detector for a strip-shaped plate which performs flaw detection by irradiating ultrasonic waves in a thickness direction of the strip-shaped plate to be formed.
【0002】[0002]
【従来の技術】連続的に通板される鋼帯の板厚方向に超
音波を送受信する方法としては、図6に示す如く、鋼帯
10の下方に上向きに配置したノズル12から鋼帯10
の下面に向けて水14を噴射して、前記ノズル12から
鋼帯10の下面に至る水柱を形成し、前記ノズル12内
に上向きに配置した超音波探触子16から前記水柱内に
超音波ビーム18を入射して、鋼帯10に超音波を伝搬
する方法が知られている。2. Description of the Related Art As a method of transmitting and receiving ultrasonic waves in the thickness direction of a steel strip continuously passed, as shown in FIG.
Water 14 is sprayed toward the lower surface of the steel strip 10 to form a water column extending from the nozzle 12 to the lower surface of the steel strip 10, and an ultrasonic probe 16 arranged upward in the nozzle 12 transmits ultrasonic waves into the water column. A method is known in which a beam 18 is incident and an ultrasonic wave is transmitted to the steel strip 10.
【0003】このような水柱を用いた超音波探傷装置に
よれば、連続して走行している鋼帯に、効率良く超音波
を送受信することができる。According to the ultrasonic flaw detector using such a water column, ultrasonic waves can be efficiently transmitted and received to and from a continuously running steel strip.
【0004】[0004]
【発明が解決しようとする問題点】しかしながら、超音
波探触子及び水柱を板幅方向に走査して探傷を行う場
合、走査速度が高速であると、空気抵抗等により水柱の
形状が乱れ、超音波を正確に送受信できないことがあ
る。従って、走査速度に制限を受け、高速走査を行えな
いという問題点を有していた。However, when flaw detection is performed by scanning the ultrasonic probe and the water column in the width direction of the plate, if the scanning speed is high, the shape of the water column is disturbed by air resistance or the like. In some cases, ultrasonic waves cannot be transmitted and received accurately. Therefore, there is a problem that the scanning speed is limited and high-speed scanning cannot be performed.
【0005】一方、帯状ではなく、個別の板を探傷する
際には、水槽中に板を沈め、その上方に配置した超音波
探触子から下向きに超音波を入射することが行われてい
る。On the other hand, when flaw detection is performed on an individual plate instead of a strip, the plate is immersed in a water tank, and ultrasonic waves are incident downward from an ultrasonic probe disposed above the plate. .
【0006】この水浸方式をオンラインで走行している
鋼帯の超音波探傷に適用する際には、図7に示す如く、
鋼帯10のパスラインの一部をデフレクトロール22に
より下方に曲げて、水槽20内の水14中に浸漬し、該
水槽20の水面近傍に下向きに配置した超音波探触子1
6から超音波ビーム18を入射することが考えられる。When this water immersion method is applied to ultrasonic inspection of a steel strip running online, as shown in FIG.
An ultrasonic probe 1 in which a part of the pass line of the steel strip 10 is bent downward by the deflector roll 22 and immersed in the water 14 in the water tank 20, and disposed downward near the water surface of the water tank 20.
It is conceivable that the ultrasonic beam 18 enters from FIG.
【0007】しかしながら、この方法では、現状ライン
のパスラインを変更する必要があり、現有ラインへの設
置が容易でない。更に、パスラインを変更するに際し
て、デフレクトロール22に張力が加わるため、小径ロ
ールを使うことができず、超音波測定部分のデフレクト
ロール22間の水平距離が大となって、パスライン変動
が大となり、高精度の測定ができない等の問題点があ
る。However, in this method, it is necessary to change the pass line of the current line, and it is not easy to install the existing line. Further, when the pass line is changed, tension is applied to the deflector roll 22, so that a small-diameter roll cannot be used. Is large, and high-precision measurement cannot be performed.
【0008】本発明は、前記従来の問題点を解消するべ
くなされたもので、現状ラインのパスラインを変更する
ことなく、超音波測定部分のパスライン変動を抑えて、
高速走査を行いつつ高精度でオンライン測定を行うこと
が可能な帯状板の超音波探傷装置を提供することを目的
とする。SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and it is possible to suppress the variation of the ultrasonic measurement portion without changing the current line.
An object of the present invention is to provide an ultrasonic flaw detector for a strip-shaped plate capable of performing on-line measurement with high accuracy while performing high-speed scanning.
【0009】[0009]
【問題点を解決するための手段】本発明は、連続して通
板される帯状板の板厚方向に超音波を入射して探傷を行
う帯状板の超音波探傷装置において、液洩れを防止しつ
つ前記帯状板を挟持して、そのパスラインを略水平に保
持するための、上下のシール用ピンチロールが入側及び
出側にそれぞれ設けられた、前記帯状板を連続的に液中
に浸漬させる液槽と、少くとも先端が該液槽内の液中に
浸漬され、同じ液中に浸漬されている帯状板の板厚方向
に超音波を入射する超音波探触子と、該超音波探触子
を、帯状板の板幅方向に走査する手段とを備えることに
より、前記目的を達成したものである。SUMMARY OF THE INVENTION The present invention is to prevent liquid leakage in an ultrasonic flaw detection apparatus for a strip-shaped plate which performs ultrasonic detection in a thickness direction of a strip-shaped sheet continuously passed therethrough to perform flaw detection. The pinch rolls for upper and lower seals are provided on the entrance side and the exit side, respectively, for holding the band-like plate while holding the pass line substantially horizontal while the band-like plate is continuously in the liquid. A liquid tank to be immersed, an ultrasonic probe at least a tip of which is immersed in the liquid in the liquid tank, and ultrasonic waves incident in the thickness direction of the band-shaped plate immersed in the same liquid; The object is achieved by providing a means for scanning the acoustic probe in the width direction of the band-shaped plate.
【0010】[0010]
【作用】本発明においては、帯状板の入側及び出側を2
本のシール用ピンチロールで挟持して、液槽からの液洩
れを防止している。従って、現状ラインのパスラインを
変更することなく、帯状板を液槽内の液中に連続的に浸
漬させることができる。According to the present invention, the entrance side and the exit side of the belt-like plate are two
It is pinched by a pinch roll for sealing to prevent liquid leakage from the liquid tank. Therefore, the belt-shaped plate can be continuously immersed in the liquid in the liquid tank without changing the pass line of the current line.
【0011】従って、超音波探触子の少くとも先端を、
この液槽内の液中に浸漬することで、効率良く超音波を
送受信できる。Therefore, at least the tip of the ultrasonic probe is
By immersing in the liquid in the liquid tank, ultrasonic waves can be transmitted and received efficiently.
【0012】更に、この超音波探触子を、帯状板の板幅
方向に高速で走査することができる。Further, the ultrasonic probe can scan at a high speed in the width direction of the band-shaped plate.
【0013】又、現状ラインのパスラインを変更する必
要がないため、現有ラインへの設置が容易である。更
に、パスラインが略水平であるため、入側及び出側のシ
ール用ピンチロールに張力が加わることがなく、小径ロ
ールを使用可能であり、ピンチロール間の距離を短くし
て、超音波測定部分のパスライン変動を小さく抑えるこ
とができる。Further, since there is no need to change the pass line of the current line, installation on the existing line is easy. Furthermore, since the pass line is substantially horizontal, no tension is applied to the sealing pinch rolls on the entrance side and the exit side, and a small-diameter roll can be used. It is possible to suppress the fluctuation of the pass line in a part.
【0014】特に、前記液槽に、前記ピンチロール周辺
からの洩液量に見合う液を常時注入して、該液槽内の液
を保持するようにした場合には、ピンチロール周辺のシ
ール性能があまり高くなくてもよく、経済的である。In particular, when a liquid corresponding to the amount of liquid leaking from the vicinity of the pinch roll is constantly injected into the liquid tank and the liquid in the liquid tank is held, the sealing performance around the pinch roll is improved. Is not very expensive and economical.
【0015】又、前記液槽の底面に、超音波反射板を配
設した場合には、帯状板を通過した超音波が帯状板に再
入射され、多重反射波の強度が増加できる。When an ultrasonic reflecting plate is provided on the bottom surface of the liquid tank, the ultrasonic wave passing through the band plate is re-incident on the band plate, and the intensity of the multiple reflected wave can be increased.
【0016】[0016]
【実施例】以下、図面を参照して、本発明の実施例を詳
細に説明する。Embodiments of the present invention will be described below in detail with reference to the drawings.
【0017】本発明の第1実施例においては、図1に示
す如く、鋼帯10の水槽30に対する入側及び出側を、
それぞれ上下2本のシール用ピンチロールでシールし、
該シール用ピンチロール32の下部及び端面に対して、
0.5mm程度の隙間を有する水槽30を設置する。In the first embodiment of the present invention, as shown in FIG.
Seal each with two upper and lower sealing pinch rolls,
With respect to the lower part and the end face of the sealing pinch roll 32,
A water tank 30 having a gap of about 0.5 mm is installed.
【0018】この水槽30内に、水槽30とシール用ピ
ンチロール32との隙間から洩れ出す水の量を超える水
量を常時注入することにより、水槽30内の水位30A
を保持する。By constantly injecting into the water tank 30 an amount of water that exceeds the amount of water leaking from the gap between the water tank 30 and the pinch roll 32 for sealing, the water level 30A in the water tank 30 is maintained.
Hold.
【0019】前記水槽30の底面には、図2に示す如
く、超音波反射板34が配設され、鋼帯10を通過した
超音波ビーム18を鋼帯10に再入射させ、多重反射波
の強度を増加するようにされている。As shown in FIG. 2, an ultrasonic reflecting plate 34 is disposed on the bottom of the water tank 30, and the ultrasonic beam 18 having passed through the steel strip 10 is re-incident on the steel strip 10 to produce a multiple reflected wave. It is designed to increase strength.
【0020】前記水槽30の上部に、超音波探触子16
を、下向きとされた先端が、前記水槽30内の水中に浸
漬されるように配置する。The ultrasonic probe 16 is placed above the water tank 30.
Is disposed such that the downwardly directed tip is immersed in the water in the water tank 30.
【0021】この超音波探触子16は、走査機構36に
よって、図3に示す如く、鋼帯10の蛇行も考慮した板
幅方向全測定範囲に亘って走査される。As shown in FIG. 3, the ultrasonic probe 16 is scanned by the scanning mechanism 36 over the entire measurement range in the plate width direction in consideration of the meandering of the steel strip 10.
【0022】前記超音波探触子16による探傷の原理と
しては、例えば、出願人が既に提案した特開平1−22
9962を利用して、珪素鋼板の結晶粒方位分布測定を
行うことができる。The principle of flaw detection by the ultrasonic probe 16 is described, for example, in Japanese Patent Application Laid-Open No. 1-22, already proposed by the applicant.
Using 9962, the crystal grain orientation distribution of a silicon steel sheet can be measured.
【0023】この場合には、多重反射波の強度差を測定
することにより、結晶方位の違いを判定することができ
る。In this case, the difference in crystal orientation can be determined by measuring the intensity difference between the multiple reflected waves.
【0024】次に、本発明の第2実施例を詳細に説明す
る。Next, a second embodiment of the present invention will be described in detail.
【0025】この第2実施例は、前記第1実施例と同様
の、鋼帯10の全幅に亘って走査される超音波探触子1
6の他に、鋼帯10のエッジ部を小さい走査範囲で高速
走査する超音波探触子17を付加したものである。The second embodiment is similar to the first embodiment, except that the ultrasonic probe 1 is scanned over the entire width of the steel strip 10.
In addition to 6, an ultrasonic probe 17 for scanning the edge portion of the steel strip 10 at high speed in a small scanning range is added.
【0026】前記エッジ部用の超音波探触子17は、例
えば図5に示すように走査される。The ultrasonic probe 17 for the edge is scanned, for example, as shown in FIG.
【0027】本実施例においては、鋼帯10に異常部位
の存在する可能性が高い鋼帯10のエッジ部を高速で走
査することができるので、異常部位の探傷をより高精度
で行うことができる。In this embodiment, since the edge of the steel strip 10 where the possibility that an abnormal portion exists in the steel strip 10 is high can be scanned at a high speed, the flaw detection of the abnormal portion can be performed with higher accuracy. it can.
【0028】なお、実施例においては、いずれも、超音
波が水中を通るようにされていたが、超音波を通すべき
液の種類はこれに限定されず、例えば水に他の微量成分
を加えたものとしたり、又は、他の液を用いたりするこ
とができる。In each of the embodiments, the ultrasonic waves are made to pass through the water. However, the type of liquid through which the ultrasonic waves pass is not limited to this. For example, other trace components may be added to water. Or other liquids can be used.
【0029】又、前記実施例においては、いずれも、鋼
板の結晶方位が測定されていたが、測定対象はこれに限
定されず、他の帯状板の他の欠陥や異常部位を測定する
際にも、本発明は適用可能である。In each of the above embodiments, the crystal orientation of the steel sheet was measured. However, the object to be measured is not limited to this. However, the present invention is applicable.
【0030】[0030]
【発明の効果】以上説明した通り、本発明によれば、帯
状板のパスラインを変更することなく液槽を設置するこ
とができ、超音波探傷装置の現有ラインへの設置が容易
である。As described above, according to the present invention, the liquid tank can be installed without changing the pass line of the band-shaped plate, and the ultrasonic flaw detector can be easily installed on the existing line.
【0031】又、パスラインが略水平であるため、シー
ル用ピンチロールとして小径ロールを使用可能であり、
ピンチロール間の距離を短くできるので、超音波測定部
分のパスライン変動を小さく抑えることができる。即
ち、オンライン測定に際しては、測定精度を確保するた
めに、感度低下を防ぐ必要があり、そのためには、パス
ライン変動や帯状板の傾きを小さく抑える必要がある
が、本発明によれば、十分にこれを満足することができ
る。Since the pass line is substantially horizontal, a small-diameter roll can be used as a pinch roll for sealing.
Since the distance between the pinch rolls can be shortened, it is possible to suppress the fluctuation of the pass line in the ultrasonic measurement portion. That is, at the time of online measurement, in order to ensure measurement accuracy, it is necessary to prevent a decrease in sensitivity, and for that purpose, it is necessary to suppress the fluctuation of the pass line and the inclination of the band-shaped plate. This can be satisfied.
【0032】更に、水柱方式のように走査による水柱の
乱れの影響を受けることがないので、高速走査が可能で
ある。Further, since there is no influence of the disturbance of the water column due to the scanning unlike the water column method, high-speed scanning is possible.
【図1】図1は、本発明の第1実施例の全体構成を示す
斜視図である。FIG. 1 is a perspective view showing an overall configuration of a first embodiment of the present invention.
【図2】図2は、第1実施例における測定系の構成を示
す断面図である。FIG. 2 is a cross-sectional view illustrating a configuration of a measurement system according to the first embodiment.
【図3】図3は、第1実施例における超音波探触子の走
査パターンを示す平面図である。FIG. 3 is a plan view showing a scanning pattern of the ultrasonic probe according to the first embodiment.
【図4】図4は、本発明の第2実施例の構成を示す斜視
図である。FIG. 4 is a perspective view showing a configuration of a second exemplary embodiment of the present invention.
【図5】図5は、第2実施例のエッジ測定用超音波探触
子の走査パターンを示す平面図である。FIG. 5 is a plan view showing a scanning pattern of the ultrasonic probe for edge measurement according to the second embodiment.
【図6】図6は、従来の水柱方式の超音波探傷装置の構
成を示す断面図である。FIG. 6 is a cross-sectional view showing a configuration of a conventional water column type ultrasonic testing device.
【図7】図7は、帯状板のパスラインを曲げて水槽を設
置する例を示す断面図である。FIG. 7 is a cross-sectional view illustrating an example in which a water tank is installed by bending a pass line of a band-shaped plate.
10…鋼帯、 14…水、 16、17…超音波探触子、 18…超音波ビーム、 30…水槽、 30A…水位、 32…シール用ピンチロール、 34…超音波反射板、 36、37…走査機構。 DESCRIPTION OF SYMBOLS 10 ... Steel strip, 14 ... Water, 16, 17 ... Ultrasonic probe, 18 ... Ultrasonic beam, 30 ... Water tank, 30A ... Water level, 32 ... Pinch roll for sealing, 34 ... Ultrasonic reflecting plate, 36, 37 ... scanning mechanism.
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7,DB名) G01N 29/00 - 29/28 ──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. 7 , DB name) G01N 29/00-29/28
Claims (3)
音波を入射して探傷を行う帯状板の超音波探傷装置にお
いて、 液洩れを防止しつつ前記帯状板を挟持して、そのパスラ
インを略水平に保持するための、上下のシール用ピンチ
ロールが入側及び出側にそれぞれ設けられた、前記帯状
板を連続的に液中に浸漬させる液槽と、 少くとも先端が該液槽内の液中に浸漬され、同じ液中に
浸漬されている帯状板の板厚方向に超音波を入射する超
音波探触子と、 該超音波探触子を、帯状板の板幅方向に走査する手段
と、 を備えたことを特徴とする帯状板の超音波探傷装置。An ultrasonic flaw detector for detecting flaws by irradiating ultrasonic waves in the thickness direction of the strips that are continuously passed through the belt-like plate while holding the band-like plate while preventing liquid leakage. A liquid tank provided with upper and lower sealing pinch rolls on an inlet side and an outlet side, respectively, for keeping the pass line substantially horizontal; a liquid tank for continuously immersing the band-like plate in a liquid; Are immersed in the liquid in the liquid tank, and an ultrasonic probe that irradiates ultrasonic waves in the thickness direction of the band-shaped plate immersed in the same liquid; and A means for scanning in the width direction of the plate;
チロール周辺からの洩液量に見合う液を常時注入して、
該液槽内の液位を保持するようにしたことを特徴とする
帯状板の超音波探傷装置。2. The method according to claim 1, wherein a liquid corresponding to the amount of liquid leaking from around the pinch roll is constantly injected into the liquid tank,
An ultrasonic flaw detector for a strip-shaped plate, wherein the liquid level in the liquid tank is maintained.
音波反射板を配設したことを特徴とする帯状板の超音波
探傷装置。3. An ultrasonic flaw detector for a strip-shaped plate according to claim 1, wherein an ultrasonic reflection plate is provided on a bottom surface of said liquid tank.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP03339944A JP3097253B2 (en) | 1991-11-28 | 1991-11-28 | Ultrasonic flaw detector for band-shaped plate |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP03339944A JP3097253B2 (en) | 1991-11-28 | 1991-11-28 | Ultrasonic flaw detector for band-shaped plate |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH05149929A JPH05149929A (en) | 1993-06-15 |
JP3097253B2 true JP3097253B2 (en) | 2000-10-10 |
Family
ID=18332239
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP03339944A Expired - Fee Related JP3097253B2 (en) | 1991-11-28 | 1991-11-28 | Ultrasonic flaw detector for band-shaped plate |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP3097253B2 (en) |
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CN105849549A (en) * | 2013-12-23 | 2016-08-10 | Posco公司 | Ultrasonic flaw detection apparatus and method for detecting flaw of steel plate |
EP3088883A4 (en) * | 2013-12-23 | 2017-07-05 | Posco | Ultrasonic flaw detection apparatus and method for detecting flaw of steel plate |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6266983B1 (en) | 1998-12-09 | 2001-07-31 | Kawasaki Steel Corporation | Method and apparatus for detecting flaws in strip, method of manufacturing cold-rolled steel sheet and pickling equipment for hot-rolled steel strip |
KR20000047762A (en) * | 1998-12-09 | 2000-07-25 | 에모또 간지 | Method and apparatus for detecting flaws in strip, method of manufacturing cold-rolled steel sheet and pickling equipment for hot-rolled steel strip |
JP2001324482A (en) * | 2000-05-12 | 2001-11-22 | Kawasaki Steel Corp | Ultrasonic flaw detector |
KR20030054633A (en) * | 2001-12-26 | 2003-07-02 | 주식회사 포스코 | Interior crack exploration apparatus of continuous casting slab |
-
1991
- 1991-11-28 JP JP03339944A patent/JP3097253B2/en not_active Expired - Fee Related
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105849549A (en) * | 2013-12-23 | 2016-08-10 | Posco公司 | Ultrasonic flaw detection apparatus and method for detecting flaw of steel plate |
EP3088883A4 (en) * | 2013-12-23 | 2017-07-05 | Posco | Ultrasonic flaw detection apparatus and method for detecting flaw of steel plate |
US10082487B2 (en) | 2013-12-23 | 2018-09-25 | Posco | Apparatus and method for ultrasonic detection to detect flaws of steel plate |
CN105849549B (en) * | 2013-12-23 | 2019-01-11 | Posco公司 | Detect the ultrasonic detecting equipment and method of steel plate defect |
Also Published As
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JPH05149929A (en) | 1993-06-15 |
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