JP2002090348A - Ultrasonic probe and ultrasonic inspection method - Google Patents
Ultrasonic probe and ultrasonic inspection methodInfo
- Publication number
- JP2002090348A JP2002090348A JP2000286558A JP2000286558A JP2002090348A JP 2002090348 A JP2002090348 A JP 2002090348A JP 2000286558 A JP2000286558 A JP 2000286558A JP 2000286558 A JP2000286558 A JP 2000286558A JP 2002090348 A JP2002090348 A JP 2002090348A
- Authority
- JP
- Japan
- Prior art keywords
- inspected
- ultrasonic
- probe
- curvature
- wedge
- 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
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
-
- 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
- G01N2291/26—Scanned objects
- G01N2291/269—Various geometry objects
- G01N2291/2693—Rotor or turbine parts
Landscapes
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、被検査体内部へ超
音波を送信し被検査体内部からの反射波を受信して被検
査体内部の欠陥を検出するための超音波探触子および超
音波検査方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultrasonic probe for transmitting an ultrasonic wave into an object to be inspected, receiving a reflected wave from the inside of the object to be inspected, and detecting a defect inside the object to be inspected. The present invention relates to an ultrasonic inspection method.
【０００２】[0002]
【従来の技術】一般に、火力発電プラントや原子力発電
プラントにおいては、プラント構成機器の健全性を評価
するために非破壊検査が実施されている。例えば、蒸気
配管や給排水配管は、被検査体である配管の表面に超音
波探触子を設置し、超音波探触子から被検査体内部へ超
音波を送信して、被検査体内部の欠陥部位からの反射波
を受信し被検査体内部の欠陥を検出するようにしてい
る。2. Description of the Related Art Generally, in a thermal power plant and a nuclear power plant, non-destructive inspection is performed to evaluate the soundness of the components constituting the plant. For example, for steam pipes and plumbing pipes, an ultrasonic probe is installed on the surface of the pipe to be inspected, ultrasonic waves are transmitted from the ultrasonic probe to the inside of the inspected object, and A reflected wave from a defective portion is received to detect a defect inside the inspection object.
【０００３】この場合、超音波探触子の被検査体への設
置は、被検査体表面に超音波探触子を接触させ、超音波
探触子から被検査体の検査対象部位に向けて超音波を送
信する。通常、超音波探触子と被検査体表面との間には
接触媒質を介在させ、超音波探触子と被検査体との接触
面の密着度を高め、超音波が被検査体の検査対象部位に
適切に送信されるようにしている。[0003] In this case, the ultrasonic probe is installed on the object to be inspected by bringing the ultrasonic probe into contact with the surface of the object to be inspected and directing the ultrasonic probe from the ultrasonic probe to a site to be inspected on the object to be inspected. Transmit ultrasound. Normally, a couplant is interposed between the ultrasonic probe and the surface of the object to be inspected to increase the degree of adhesion of the contact surface between the ultrasonic probe and the object to be inspected. It is transmitted to the target site appropriately.
【０００４】[0004]
【発明が解決しようとする課題】ところが、被検査体の
形状が特殊な曲率の表面形状である場合には、超音波探
触子を被検査体の表面に適切に接触させることができな
い。すなわち、超音波探触子と被検査体表面との間の隙
間が大きい場合には、その隙間を接触媒質で充填するこ
とができず、また、超音波探触子を被検査体の検査対象
部位に適切に向けて配置することができない。However, if the object to be inspected has a special curvature, the ultrasonic probe cannot be brought into contact with the surface of the object to be inspected properly. That is, when the gap between the ultrasonic probe and the surface of the device under test is large, the gap cannot be filled with the couplant, and the ultrasonic probe is Cannot be properly oriented at the site.
【０００５】例えば、火力発電プラントにおける低圧タ
ービン最終段翼植え込み部のピン孔の検査は、タービン
翼の根元が特殊な曲率を持った表面形状であるため、超
音波探触子をその表面に適切に設置することが困難であ
る。[0005] For example, in the inspection of a pin hole in a low-pressure turbine final stage blade implantation portion in a thermal power plant, the root of the turbine blade has a surface shape having a special curvature. It is difficult to install in
【０００６】そこで、従来においては、低圧タービン最
終段翼植え込み部のピン孔の検査は、低圧タービンロー
ターからタービン翼を取外し、そのタービン翼の翼植え
込み部のピン孔に発生する亀裂などの欠陥の有無につい
て、目視検査や染色浸透探傷検査を行っている。Therefore, conventionally, the inspection of the pin hole of the low-pressure turbine final stage blade implant portion is performed by removing the turbine blade from the low-pressure turbine rotor and detecting a defect such as a crack generated in the pin hole of the blade implant portion of the turbine blade. For the presence or absence, visual inspection and dye penetration inspection are performed.
【０００７】このように、目視検査や染色浸透探傷検査
であるので、検査者の視覚に頼ることになり、欠陥の有
無や大きさの判定に個人差が生じやすい。As described above, since the visual inspection and the dye penetrant inspection are based on the visual inspection of the inspector, individual differences are likely to occur in determining the presence or absence and size of the defect.
【０００８】本発明の目的は、特殊な曲率の表面を持っ
た被検査体に対し、その検査対象部位に効率よく超音波
の送受信ができる超音波探触子および超音波検査方法を
提供することにある。An object of the present invention is to provide an ultrasonic probe and an ultrasonic inspection method capable of efficiently transmitting and receiving ultrasonic waves to and from an inspection object having a surface with a special curvature. It is in.
【０００９】[0009]
【課題を解決するための手段】請求項１の発明に係わる
超音波探触子は、被検査体に超音波を送信すると共に前
記被検査体からの反射波を受信する探触子本体と、前記
探触子本体の先端部に装着され前記被検査体表面の曲率
に合致する曲率面を有し超音波を伝搬するくさび部とを
備えたことを特徴とする。According to a first aspect of the present invention, there is provided an ultrasonic probe which transmits an ultrasonic wave to an object to be inspected and receives a reflected wave from the object to be inspected; A wedge portion which is attached to the tip of the probe main body and has a curvature surface which matches the curvature of the surface of the test object and which transmits ultrasonic waves.
【００１０】請求項１の発明に係わる超音波探触子にお
いては、先端部にくさび部が装着された探触子本体のく
さび部の表面を、被検査体表面に接触して配置する。く
さび部の表面と被検査体の表面との曲率が同じであるの
で隙間なく接触する。そして、探触子本体から超音波を
送信する。これにより、特殊な曲率の被検査体表面に対
してくさび部を介して適正に被検査体の検査対象部位に
超音波を送信でき、欠陥部位を精度良く検査できる。[0010] In the ultrasonic probe according to the first aspect of the present invention, the surface of the wedge portion of the probe main body having the wedge portion attached to the tip portion is disposed in contact with the surface of the inspection object. Since the curvature of the surface of the wedge portion is the same as the curvature of the surface of the test object, they come into contact without any gap. Then, ultrasonic waves are transmitted from the probe main body. Thus, the ultrasonic wave can be appropriately transmitted to the inspection target portion of the inspection target through the wedge portion to the surface of the inspection target having a special curvature, and the defective portion can be inspected with high accuracy.
【００１１】請求項２の発明に係わる超音波探触子は、
請求項１の発明において、前記被検査体と前記くさび部
との接触面で反射し前記くさび部内に反射してきた超音
波を吸音するための吸音材を備えたことを特徴とする。An ultrasonic probe according to a second aspect of the present invention comprises:
The invention according to claim 1 is characterized in that a sound absorbing material is provided for absorbing ultrasonic waves reflected on the contact surface between the object to be inspected and the wedge portion and reflected in the wedge portion.
【００１２】請求項２の発明に係わる超音波探触子にお
いては、請求項１の発明の作用に加え、吸音材は被検査
体とくさび部との接触面で反射し、くさび部内に入って
きた超音波を吸音する。これにより、被検査体の欠陥部
位からの反射波を精度良く受信できるようにし、欠陥部
位の検査精度を向上させる。In the ultrasonic probe according to the second aspect of the present invention, in addition to the function of the first aspect, the sound absorbing material is reflected on the contact surface between the object to be inspected and the wedge portion and enters the wedge portion. Absorbs ultrasonic waves. As a result, it is possible to accurately receive a reflected wave from a defective portion of the inspection object, and improve the inspection accuracy of the defective portion.
【００１３】請求項３の発明に係わる超音波検査方法
は、被検査体表面の曲率に合致する曲率面を持ったくさ
び部を選択し、選択した前記くさび部を探触子本体に装
着し、前記くさび部を前記被検査体表面に密着させ、前
記探触子本体から前記くさび部を介して前記被検査体に
超音波を送信し、前記被検査体からの反射波を受信して
前記被検査体の欠陥を検査することを特徴とする。According to a third aspect of the present invention, there is provided an ultrasonic inspection method, comprising: selecting a wedge having a curvature surface that matches the curvature of the surface of an object to be inspected; mounting the selected wedge on a probe body; The wedge portion is brought into close contact with the surface of the object to be inspected, an ultrasonic wave is transmitted from the probe body to the object to be inspected via the wedge portion, a reflected wave from the object to be inspected is received, and the wedge portion is received. It is characterized by inspecting a defect of the inspection object.
【００１４】請求項３の発明に係わる超音波検査方法に
おいては、探触子本体とくさび部とを着脱自在に形成し
ておくと共に、被検査体に応じて予め複数個のくさび部
を用意しておく。被検査体の検査にあたっては、その被
検査体表面の曲率に合致する曲率面を持ったくさび部を
選択し、その選択したくさび部を探触子本体に装着す
る。そして、くさび部を被検査体の表面曲率に沿って密
着させ、探触子本体からくさび部を介して被検査体に超
音波を送信すると共に被検査体からの反射波を受信す
る。受信した反射波により被検査体の欠陥を検査する。[0014] In the ultrasonic inspection method according to the third aspect of the present invention, the probe main body and the wedge portion are detachably formed, and a plurality of wedge portions are prepared in advance according to the object to be inspected. Keep it. When inspecting the object to be inspected, a wedge having a curvature surface that matches the curvature of the surface of the object to be inspected is selected, and the selected wedge is attached to the probe body. Then, the wedge portion is brought into close contact with the surface curvature of the object to be inspected, and an ultrasonic wave is transmitted from the probe body to the object to be inspected via the wedge portion, and a reflected wave from the object is received. The defect of the inspection object is inspected by the received reflected wave.
【００１５】[0015]
【発明の実施の形態】以下、本発明の実施の形態を説明
する。図１は本発明の実施の形態に係わる超音波探触子
の説明図であり、図１（ａ）は正面図、図１（ｂ）は平
面図である。Embodiments of the present invention will be described below. FIG. 1 is an explanatory diagram of an ultrasonic probe according to an embodiment of the present invention. FIG. 1A is a front view, and FIG. 1B is a plan view.
【００１６】図１（ａ）において、超音波を送受信する
探触子本体１の先端部には、超音波を伝搬するくさび部
２が取り付けられる。このくさび部２は、被検査体表面
の曲率に合致する曲率面を有し、探触子本体１からの超
音波を伝搬して被検査体に送信すると共に、被検査体か
らの反射波を伝搬し探触子本体１に受信させる。また、
くさび部２には吸音材３が取り付けられており、この吸
音材３により、被検査体とくさび部２との接触面で反射
してきた超音波を吸音する。In FIG. 1A, a wedge portion 2 for transmitting ultrasonic waves is attached to the tip of a probe main body 1 for transmitting and receiving ultrasonic waves. The wedge portion 2 has a curvature surface that matches the curvature of the surface of the object to be inspected, transmits the ultrasonic wave from the probe body 1 to the object to be inspected, and transmits a reflected wave from the object to be inspected. Propagate and let the probe body 1 receive. Also,
A sound absorbing material 3 is attached to the wedge portion 2, and the sound absorbing material 3 absorbs ultrasonic waves reflected on a contact surface between the object to be inspected and the wedge portion 2.
【００１７】くさび部２の上端部には、探触子本体１と
くさび部２とを着脱自在に取り付けるためのねじ込み部
４が取り付けられている。このねじ込み部４は、図１
（ｂ）に示すように、くさび部２に４個のねじ５でねじ
止めされている。At the upper end of the wedge part 2, a screw-in part 4 for detachably attaching the probe main body 1 and the wedge part 2 is attached. This screwed portion 4 is shown in FIG.
As shown in (b), the wedge part 2 is screwed with four screws 5.
【００１８】ねじ込み部４の内側内面には雌ねじが形成
され、探触子本体１の先端部の外周面には雄ねじが形成
されており、探触子本体１の雄ねじとねじ込み部４の雌
ねじとが螺合して、探触子本体１はくさび部２に着脱自
在に取り付けられる。A female screw is formed on the inner surface of the screwed portion 4, and a male screw is formed on the outer peripheral surface of the tip of the probe body 1. The male screw of the probe body 1 and the female screw of the screwed portion 4 are connected to each other. Are screwed together, and the probe main body 1 is detachably attached to the wedge portion 2.
【００１９】ねじ込み部４の内側には、予め接触媒質で
ある油が充填されており、接触子本体１がくさび部２に
装着された際に、接触子本体１とくさび部２との接触面
での超音波の伝搬を効率良く行えるようにしている。ま
た、油ぬき穴６は、探触子本体１をねじ込み部４にねじ
込んで装着する際に、余分な油を外部に流出させるため
のものである。The inside of the threaded portion 4 is previously filled with oil serving as a couplant, and when the contact body 1 is mounted on the wedge portion 2, the contact surface between the contact body 1 and the wedge portion 2 is formed. Thus, the ultrasonic wave can be efficiently propagated in the. The oil hole 6 is for letting excess oil flow out when the probe main body 1 is screwed into the screwing portion 4 and mounted.
【００２０】ここで、くさび部２の外形は被検査体の表
面と密着するように、被検査体表面の曲率に合致する曲
率面を有している。すなわち、被検査体表面の曲率に合
致する曲率のＲ加工が施されており、ねじ込み部４の取
付位置についても、被検査体内の検査対象部位方向に超
音波を送信できるような入射角と屈折角とを満足する位
置に取付られている。これにより、探触子本体１から送
信された超音波は、例えば図１（ａ）に示すように、く
さび部２を通って入射点Ｘから被検査体に超音波を送信
することになる。Here, the outer shape of the wedge portion 2 has a curvature surface that matches the curvature of the surface of the object to be inspected so as to be in close contact with the surface of the object to be inspected. In other words, the R processing is performed with a curvature that matches the curvature of the surface of the inspection object, and the angle of incidence and refraction at which the ultrasonic screw can be transmitted toward the inspection target portion in the inspection object also at the mounting position of the screwed portion 4. It is installed at a position that satisfies the corner. Thereby, the ultrasonic wave transmitted from the probe main body 1 transmits the ultrasonic wave from the incident point X to the test object through the wedge portion 2 as shown in FIG. 1A, for example.
【００２１】吸音材３は、この探触子本体１から送信さ
れた超音波がくさび部２の入射点Ｘにおいて、被検査体
内に送信されずくさび部２内に反射してきた場合に、そ
の反射した超音波がくさび部２内部で乱反射することを
防ぐために設けられている。When the ultrasonic wave transmitted from the probe main body 1 is reflected at the incident point X of the wedge portion 2 without being transmitted to the body to be inspected, the sound absorbing material 3 reflects the ultrasonic wave. It is provided to prevent the reflected ultrasonic wave from being irregularly reflected inside the wedge portion 2.
【００２２】図２は、被検査体としての低圧タービン最
終段翼植え込み部の説明図であり、図２（ａ）は一部切
欠斜視図、図２（ｂ）は一部切欠拡大図である。FIGS. 2A and 2B are explanatory views of a low-pressure turbine final stage blade implantation section as an object to be inspected. FIG. 2A is a partially cutaway perspective view, and FIG. 2B is a partially cutaway enlarged view. .
【００２３】低圧タービン最終段のタービン翼８は、特
殊な曲率を持った表面形状をしており、低圧タービン最
終段翼植え込み部のピン孔の検査は、そのタービン翼８
の表面に超音波探触子を配置して検査を行うことにな
る。The turbine blade 8 at the last stage of the low-pressure turbine has a surface shape having a special curvature.
Inspection is performed by arranging an ultrasonic probe on the surface of the device.
【００２４】図２（ａ）において、低圧タービン最終段
翼植込み部では、タービンロータ７の周囲に複数個のタ
ービン翼８が植え込まれており、図２（ａ）ではそのう
ちの４個のタービン翼８を示している。連結部材９で上
部が連結されて一体化されているタービン翼８は、ター
ビンロータ７に植え込まれた後に、さらにピン孔１０に
ピン１１を挿入してタービンロータ７取り付けられる。In FIG. 2A, a plurality of turbine blades 8 are implanted around the turbine rotor 7 in the low-pressure turbine final stage blade implanting section. In FIG. The wing 8 is shown. The turbine blades 8, which are integrated by connecting the upper portions with the connecting members 9, are implanted in the turbine rotor 7, and then the pins 11 are inserted into the pin holes 10 to be attached to the turbine rotor 7.
【００２５】図２（ｂ）に示すように、一体化された４
個の各々のタービン翼８ａ〜８ｄの下部には櫛状に複数
個のフォーク１２ａ〜１２ｅが形成されており、図示省
略のタービンロータ７のフォークと交互に噛み合うよう
にタービンロータ７に植え込まれる。そして、フォーク
１２ａおよび２ｅはタービンロータ７に植え込まれた際
に隣り合うタービン翼８同士でピン孔１０を形成する。
タービンロータ７のフォークには、このピン孔１０に対
応して予めピン孔が形成されており、これらのピン孔に
ピン１１を通してタービン翼８ａ〜８ｄをタービンロー
タ７に取り付ける。As shown in FIG. 2B, the integrated 4
A plurality of forks 12a to 12e are formed in a comb shape below each of the turbine blades 8a to 8d, and are implanted in the turbine rotor 7 so as to alternately mesh with the forks of the turbine rotor 7 (not shown). . Then, when the forks 12 a and 2 e are implanted in the turbine rotor 7, the turbine blades 8 adjacent to each other form a pin hole 10.
Pin holes are formed in the fork of the turbine rotor 7 in advance corresponding to the pin holes 10, and the turbine blades 8 a to 8 d are attached to the turbine rotor 7 through the pins 11.
【００２６】連結され一体化した４個のタービン翼８ａ
〜８ｄのうち、一方端のタービン翼８ａが群頭翼となり
他方端のタービン８ｄが群尾翼となる。このような低圧
タービン最終段翼植え込み部で欠陥が生じやすい部位
は、群頭翼および群尾翼の最上段のピン孔１０である。
これは、蒸気が図２（ｂ）のフォーク１２ａ側からター
ビン翼８ａ〜８ｄの間を通ってフォーク１２ｅ側に流
れ、その際にタービンロータ７に回転力を与えることか
ら、連結され一体化された４個のタービン翼８ａ〜８ｄ
のねじれ応力は、群頭翼および群尾翼の最上段のピン孔
１０で大部分を負担することになるからである。Four integrated and integrated turbine blades 8a
8d, the turbine blade 8a at one end is a group blade and the turbine 8d at the other end is a group tail blade. A site where a defect is likely to occur in such a low-pressure turbine final stage blade implantation portion is the pin hole 10 at the uppermost stage of the group head blade and the group tail blade.
This is because the steam flows from the side of the fork 12a in FIG. 2B to the side of the fork 12e through the space between the turbine blades 8a to 8d and gives a rotating force to the turbine rotor 7 at that time. Four turbine blades 8a to 8d
This is because most of the torsional stress will be borne by the uppermost pin hole 10 of the group wing and tail wing.
【００２７】図３は、群頭翼であるタービン翼８ａおよ
び群尾翼であるタービン翼８ｄの最上段のピン孔１０の
欠陥を超音波探触子で検査する場合の説明図である。群
頭翼であるタービン翼８ａおよび群尾翼であるタービン
翼８ｄには、蒸気の流れに応じてタービン翼８ａのフォ
ーク１２ａ、タービン翼８ｄのフォーク１２ｅに最も大
きいねじれ応力が働く。従って、フォーク１２ａについ
ては左側部分の最上段のピン孔１０に欠陥１３ａが生じ
やすく、フォーク１２ｅについては右側部分の最上段の
ピン孔１０に欠陥１３ｅが生じやすい。FIG. 3 is an explanatory diagram in the case of inspecting a defect of the uppermost pin hole 10 of the turbine blade 8a as a group blade and the turbine blade 8d as a group tail blade with an ultrasonic probe. The torsional stress acting on the fork 12a of the turbine blade 8a and the fork 12e of the turbine blade 8d acts on the turbine blade 8a that is the group head blade and the turbine blade 8d that is the group tail blade according to the steam flow. Therefore, a defect 13a is likely to occur in the uppermost pin hole 10 in the left portion of the fork 12a, and a defect 13e is likely to occur in the uppermost pin hole 10 in the right portion of the fork 12e.
【００２８】そこで、超音波探触子を用いて欠陥の生じ
やすい検査対象部位の検査する場合には、図３に示すよ
うに、各々のピン孔１０の上部のタービン翼８ａおよび
８ｄの表面のＡ位置およびＢ位置に超音波探触子を配置
して検査を行うことになる。Therefore, when inspecting an inspection target portion where a defect is likely to occur using an ultrasonic probe, as shown in FIG. 3, the surface of the turbine blades 8a and 8d above each pin hole 10 is inspected. The inspection is performed by arranging the ultrasonic probe at the A position and the B position.
【００２９】本発明の超音波探触子は、図１に示すよう
に被検査体表面の曲率に合致した曲率のくさび部２を備
えているので、適正に被検査体の検査対象部位に超音波
を送信でき、欠陥部位からの反射波を適正に受信でき
る。As shown in FIG. 1, the ultrasonic probe of the present invention has the wedge portion 2 having a curvature that matches the curvature of the surface of the object to be inspected. A sound wave can be transmitted, and a reflected wave from a defective portion can be properly received.
【００３０】図４は、本発明の実施の形態に係わる超音
波検査方法の内容を示すフローチャートである。まず、
準備段階として、探触子本体１に装着するくさび部２
は、被検査体の表面曲率に応じて予め複数個のくさび部
を用意しておく。また、被検査体表面での超音波の入射
角と屈折角とを考慮に入れて、探触子本体１から被検査
体内の検査対象部位方向に超音波を適正に送信できるよ
うに、ねじ込み部４の取付位置を適正に定めておく。つ
まり、探触子本体１にねじ込み部４にてくさび部２を装
着した状態で、くさび部２を被検査体の表面曲率に合わ
せて被検査体の表面に接触させたときには、探触子本体
１から被検査体内の検査対象部位方向に超音波を適正に
送信できる位置関係にしておく。FIG. 4 is a flowchart showing the contents of the ultrasonic inspection method according to the embodiment of the present invention. First,
As a preparation stage, a wedge portion 2 to be attached to the probe body 1
Prepares a plurality of wedges in advance according to the surface curvature of the test object. Also, taking into consideration the incident angle and the refraction angle of the ultrasonic wave on the surface of the object to be inspected, a threaded portion is provided so that the ultrasonic wave can be properly transmitted from the probe body 1 toward the inspection target portion in the object to be inspected. The mounting position of 4 is properly determined. That is, when the wedge portion 2 is brought into contact with the surface of the test object in accordance with the surface curvature of the test object in a state where the wedge portion 2 is attached to the probe main body 1 with the screwing portion 4, the probe main body The positional relationship is set so that the ultrasonic waves can be appropriately transmitted from 1 to the inspection target part in the inspection object.
【００３１】超音波検査を実施するにあたっては、予め
用意したくさび部２の中から検査をしようとする被検査
体表面の曲率に合致する曲率面のくさび部２を選択する
（Ｓ１）。そして、選択したくさび部２を探触子本体１
に装着し（Ｓ２）、探触子本体１に装着されたくさび部
２を被検査体表面に密着させる（Ｓ３）。この場合、必
要に応じて被検査体表面とくさび部２との間に接触媒質
を介在させても良い。When performing an ultrasonic inspection, a wedge portion 2 having a curvature surface that matches the curvature of the surface of the object to be inspected is selected from the wedge portions 2 prepared in advance (S1). Then, the selected wedge portion 2 is moved to the probe main body 1.
(S2), and the wedge portion 2 mounted on the probe main body 1 is brought into close contact with the surface of the test object (S3). In this case, a couplant may be interposed between the surface of the test object and the wedge portion 2 as necessary.
【００３２】この状態で、探触子本体１からくさび部２
を介して被検査体に超音波を送信する（Ｓ４）。探触子
本体１から送信された超音波は、ねじ込み部４内に充填
されている接触媒質およびくさび部２を通して大部分は
被検査体内に効率よく入射される。また、入射点Ｘにお
いて反射した超音波は吸音材３に吸収される。In this state, the wedge portion 2
An ultrasonic wave is transmitted to the object to be inspected via the (S4). Most of the ultrasonic waves transmitted from the probe main body 1 are efficiently incident on the body to be inspected through the couplant and the wedge portion 2 filled in the screw portion 4. The ultrasonic wave reflected at the incident point X is absorbed by the sound absorbing material 3.
【００３３】探触子本体１は、被検査体に送信した超音
波の反射波を受信する（Ｓ５）。そして、反射波に基づ
いて被検査体の欠陥を検査する（Ｓ６）。欠陥部位では
反射波が発生するので、その反射波の有無により欠陥の
有無を検査することになる。The probe main body 1 receives the reflected ultrasonic wave transmitted to the object to be inspected (S5). Then, a defect of the inspection object is inspected based on the reflected wave (S6). Since a reflected wave is generated at the defective portion, the presence or absence of the defect is inspected based on the presence or absence of the reflected wave.
【００３４】この実施の形態によれば、特殊な曲率を持
った表面形状である被検査体に対しても、適正に超音波
検査を行うことができる。According to this embodiment, an ultrasonic inspection can be appropriately performed even on an object to be inspected having a surface shape having a special curvature.
【００３５】なお、以上の説明では、吸音材３を取り付
けた場合を示したが、吸音材３を省略することも可能で
ある。吸音材３を省略した場合には、入射点Ｘにおいて
反射した反射波を探触子本体１で受信することになる
が、その反射波は入射点Ｘにおける反射波として一定の
特性を示すことから、欠陥部位からの反射波とは区別で
きる。従って、欠陥部位の判定には問題はない。In the above description, the case where the sound absorbing material 3 is attached is shown, but the sound absorbing material 3 can be omitted. If the sound absorbing material 3 is omitted, the reflected wave reflected at the incident point X will be received by the probe main body 1, but since the reflected wave shows a certain characteristic as the reflected wave at the incident point X. , Can be distinguished from the reflected wave from the defective part. Therefore, there is no problem in determining a defective portion.
【００３６】[0036]
【発明の効果】以上述べたように、本発明によれば、被
検査体表面の形状と検査の際に被検査体内に送信する超
音波の方向とが既知であれば、くさび部表面に被検査体
表面曲率に合致するＲ加工をし、そのくさび部を取付け
た超音波探触子を用いることにより、被検査体表面が特
殊な曲率を持っていても超音波検査を実施することが可
能となる。As described above, according to the present invention, if the shape of the surface of the object to be inspected and the direction of the ultrasonic wave transmitted into the object to be inspected during the inspection are known, the surface of the wedge can be covered. Ultrasonic inspection can be performed even if the surface of the inspected object has a special curvature by using an ultrasonic probe with a radius processing that matches the surface curvature of the inspected object and the wedge attached. Becomes
【００３７】例えば、火力発電プラントにおける低圧タ
ービン最終段翼植え込み部のピン孔の検査のように、タ
ービン翼の根元が特殊な曲率を持った表面形状である場
合にも、超音波探触子をその表面に適切に設置でき適正
に超音波検査ができる。For example, even when the root of the turbine blade has a surface shape with a special curvature, such as the inspection of a pin hole in the low-pressure turbine final stage blade implantation part in a thermal power plant, the ultrasonic probe can be used. It can be properly installed on the surface and ultrasonic inspection can be performed properly.
【図１】本発明の実施の形態に係わる超音波探触子の説
明図であり、図１（ａ）は正面図、図１（ｂ）は平面
図。FIG. 1 is an explanatory view of an ultrasonic probe according to an embodiment of the present invention, wherein FIG. 1 (a) is a front view and FIG. 1 (b) is a plan view.
【図２】本発明の実施の形態に係わる超音波探触子が検
査対象とする被検査体としての低圧タービン最終段翼植
え込み部の説明図であり、図２（ａ）は一部切欠斜視
図、図２（ｂ）は一部切欠拡大図。FIG. 2 is an explanatory view of a low-pressure turbine final stage blade implantation part as an object to be inspected by the ultrasonic probe according to the embodiment of the present invention, and FIG. FIG. 2 (b) is a partially cutaway enlarged view.
【図３】本発明の実施の形態に係わる超音波探触子で検
査対象であるタービン翼のピン孔の欠陥を超音波探触子
で検査する場合の説明図。FIG. 3 is an explanatory diagram in a case where a defect of a pin hole of a turbine blade to be inspected is inspected by the ultrasonic probe according to the embodiment of the present invention;
【図４】本発明の実施の形態に係わる超音波検査方法の
内容を示すフローチャート。FIG. 4 is a flowchart showing the contents of an ultrasonic inspection method according to the embodiment of the present invention.
１…探触子本体、２…くさび部、３…吸音材、４…ねじ
込み部、５…ねじ、６…油ぬき穴、７…タービンロー
タ、８…タービン翼、９…連結部材、１０…ピン孔、１
１…ピン、１２…フォーク、１３…欠陥DESCRIPTION OF SYMBOLS 1 ... Probe main body, 2 ... Wedge part, 3 ... Sound absorbing material, 4 ... Screw-in part, 5 ... Screw, 6 ... Oil hole, 7 ... Turbine rotor, 8 ... Turbine blade, 9 ... Connection member, 10 ... Pin Hole, 1
1 ... pin, 12 ... fork, 13 ... defect
───────────────────────────────────────────────────── フロントページの続き (72)発明者 飯田 英男 神奈川県横浜市鶴見区江ヶ崎町４−１ 東 京電力株式会社エネルギー・環境研究所内 Ｆターム(参考） 2G047 AB01 AC01 AC06 BA03 EA10 GB22 GB27 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hideo Iida 4-1 Egasakicho, Tsurumi-ku, Yokohama-shi, Kanagawa Prefecture F-term in the Energy and Environmental Research Laboratories, Tokyo Electric Power Company 2G047 AB01 AC01 AC06 BA03 EA10 GB22 GB27
Claims (3)
被検査体からの反射波を受信する探触子本体と、前記探
触子本体の先端部に装着され前記被検査体表面の曲率に
合致する曲率面を有し超音波を伝搬するくさび部とを備
えたことを特徴とする超音波探触子。1. A probe body for transmitting an ultrasonic wave to an object to be inspected and receiving a reflected wave from the object to be inspected, and a curvature of a surface of the object to be inspected attached to a tip of the probe body. An ultrasonic probe comprising: a wedge portion having a curvature surface that conforms to (1) and transmitting ultrasonic waves.
で反射し前記くさび部内に反射してきた超音波を吸音す
るための吸音材を備えたことを特徴とする請求項１に記
載の超音波探触子。2. A sound absorbing material according to claim 1, further comprising a sound absorbing material for absorbing ultrasonic waves reflected at a contact surface between the object to be inspected and the wedge portion and reflected in the wedge portion. Ultrasonic probe.
持ったくさび部を選択し、選択した前記くさび部を探触
子本体に装着し、前記くさび部を前記被検査体表面に密
着させ、前記探触子本体から前記くさび部を介して前記
被検査体に超音波を送信し、前記被検査体からの反射波
を受信して前記被検査体の欠陥を検査することを特徴と
する超音波検査方法。3. A wedge having a curvature surface matching the curvature of the surface of the object to be inspected is selected, the selected wedge is attached to the probe body, and the wedge is brought into close contact with the surface of the object to be inspected. Transmitting an ultrasonic wave from the probe main body to the object to be inspected through the wedge portion, receiving a reflected wave from the object to be inspected, and inspecting the defect of the object to be inspected. Ultrasonic inspection method.
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|---|---|---|---|
| JP2000286558A JP2002090348A (en) | 2000-09-21 | 2000-09-21 | Ultrasonic probe and ultrasonic inspection method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000286558A JP2002090348A (en) | 2000-09-21 | 2000-09-21 | Ultrasonic probe and ultrasonic inspection method |
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|---|---|
| JP2002090348A true JP2002090348A (en) | 2002-03-27 |
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ID=18770465
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008501109A (en) * | 2004-06-01 | 2008-01-17 | シーメンス アクチエンゲゼルシヤフト | Turbine blade flaw detection method and apparatus |
| JP2009103015A (en) * | 2007-10-22 | 2009-05-14 | Hitachi Ltd | Turbine moving blade |
| JP2009282042A (en) * | 2009-08-31 | 2009-12-03 | Hitachi Ltd | Turbine fork ultrasonic flaw detector and method |
| JP2010019130A (en) * | 2008-07-09 | 2010-01-28 | Hitachi Ltd | Turbine moving blade |
| US7841237B2 (en) | 2006-09-29 | 2010-11-30 | Hitachi, Ltd. | Ultrasonic testing apparatus for turbine forks and method thereof |
| JP2012047184A (en) * | 2011-11-10 | 2012-03-08 | Hitachi Ltd | Turbine moving blade |
| CN103063742A (en) * | 2013-01-06 | 2013-04-24 | 沈阳黎明航空发动机(集团)有限责任公司 | Surface wave in-situ flaw detection method of rotor blade with coating |
| JP2018136267A (en) * | 2017-02-23 | 2018-08-30 | 日本車輌製造株式会社 | Method for inspecting laminated elastic body |
-
2000
- 2000-09-21 JP JP2000286558A patent/JP2002090348A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008501109A (en) * | 2004-06-01 | 2008-01-17 | シーメンス アクチエンゲゼルシヤフト | Turbine blade flaw detection method and apparatus |
| US7841237B2 (en) | 2006-09-29 | 2010-11-30 | Hitachi, Ltd. | Ultrasonic testing apparatus for turbine forks and method thereof |
| CN102539534A (en) * | 2006-09-29 | 2012-07-04 | 株式会社日立制作所 | Ultrasonic testing apparatus for turbine forks and method thereof |
| JP2009103015A (en) * | 2007-10-22 | 2009-05-14 | Hitachi Ltd | Turbine moving blade |
| JP2010019130A (en) * | 2008-07-09 | 2010-01-28 | Hitachi Ltd | Turbine moving blade |
| JP2009282042A (en) * | 2009-08-31 | 2009-12-03 | Hitachi Ltd | Turbine fork ultrasonic flaw detector and method |
| JP2012047184A (en) * | 2011-11-10 | 2012-03-08 | Hitachi Ltd | Turbine moving blade |
| CN103063742A (en) * | 2013-01-06 | 2013-04-24 | 沈阳黎明航空发动机(集团)有限责任公司 | Surface wave in-situ flaw detection method of rotor blade with coating |
| CN103063742B (en) * | 2013-01-06 | 2016-02-10 | 沈阳黎明航空发动机(集团)有限责任公司 | A kind of surface wave in-situ method of detection of band coating spinner blade |
| JP2018136267A (en) * | 2017-02-23 | 2018-08-30 | 日本車輌製造株式会社 | Method for inspecting laminated elastic body |
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