JP3184267B2 - Magnetic particle flaw detector - Google Patents
Magnetic particle flaw detectorInfo
- Publication number
- JP3184267B2 JP3184267B2 JP27068491A JP27068491A JP3184267B2 JP 3184267 B2 JP3184267 B2 JP 3184267B2 JP 27068491 A JP27068491 A JP 27068491A JP 27068491 A JP27068491 A JP 27068491A JP 3184267 B2 JP3184267 B2 JP 3184267B2
- Authority
- JP
- Japan
- Prior art keywords
- test
- magnetic particle
- particle flaw
- flaw detector
- camera
- 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
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- Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
Description
【0001】[0001]
【産業上の利用分野】本発明は、材料きずを発見するた
めに行われる非破壊試験の一つの方法である磁気探傷試
験の装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for a magnetic flaw test, which is one of non-destructive tests performed to detect material flaws.
【0002】[0002]
【従来の技術】従来から、大型鉄鋼構造物の溶接部や、
鋳鍛鋼品の材料欠陥の検査には、極間法と呼ばれる磁粉
探傷法が適用されている。この方法は、図1に示すよう
に電磁石で材料500の表層部を磁化しながら、強磁性
体粉末302を水等に懸濁した検査液を注ぎかけて欠陥
部510に付着した磁粉模様から、欠陥を検出する方法
である。極間法の方法を図2に示す。図2(a)は鉄心
130と巻線131で構成される電磁石を電源110で
励磁して試験材500を磁化し、欠陥部510に発生す
る漏洩磁場121に磁粉302を吸着させて、欠陥を検
出する。図2(b)は、二組,四個の磁極132を使用し
てそれぞれの磁極の磁界の位相を変化させることにより
図2(c)に示すような回転磁界123を作り全方向の
方向性欠陥を同時に検出するようにしたものである。こ
の方法では、欠陥の検出を容易にするために、蛍光塗料
を塗布した磁粉を使用してこれに紫外線を照射した時に
発生する蛍光を観察する蛍光磁粉探傷法が採用されるこ
とが多いが、可視光線で観察する非蛍光磁粉探傷法も行
なわれている。2. Description of the Related Art Conventionally, welding parts of large steel structures,
For inspection of material defects in cast and forged steel products, a magnetic particle flaw detection method called a gap method is applied. In this method, as shown in FIG. 1, while a surface layer of the material 500 is magnetized with an electromagnet, a test solution in which the ferromagnetic powder 302 is suspended in water or the like is poured, and a magnetic powder pattern attached to the defective portion 510 is obtained. This is a method for detecting defects. FIG. 2 shows the method of the gap method. FIG. 2A shows an example in which an electromagnet composed of an iron core 130 and a winding 131 is excited by a power supply 110 to magnetize a test material 500, and a magnetic field 302 generated in a defect portion 510 is adsorbed by a magnetic powder 302 so that a defect is eliminated. To detect. FIG. 2 (b) shows a rotating magnetic field 123 as shown in FIG. 2 (c) by using two sets and four magnetic poles 132 to change the phase of the magnetic field of each magnetic pole. The defect is detected simultaneously. In this method, in order to facilitate the detection of defects, a fluorescent magnetic particle flaw detection method of observing the fluorescence generated when irradiating ultraviolet rays onto the magnetic powder coated with a fluorescent paint is often adopted, A non-fluorescent magnetic particle inspection method for observing with visible light has also been performed.
【0003】いずれの場合も、材料の磁化,検査液散
布,観察の手順が必要であり、それぞれの手順に対応し
て磁化装置,検査液散布器,照明器具が使用されるが、
これらの装置は、それぞれが分離,独立しており試験手
順に応じて検査員が手動操作して、適用する方式となっ
ている。同様に観察も検査員が、直接、目視により行い
欠陥インジケーションの有無を判別する方式であり、前
述の試験手順の個別操作も含め、自動化を大きく阻害す
る要因になっている。[0003] In any case, procedures for magnetizing the material, spraying the test solution, and observing are required, and a magnetizing device, a test solution sprayer, and a lighting apparatus are used in accordance with each procedure.
These devices are separated and independent from each other, and are manually applied by an inspector according to a test procedure and applied. Similarly, observation is performed by an inspector by directly visually observing whether or not there is a defect indication, which is a factor that greatly hinders automation, including the individual operation of the test procedure described above.
【0004】又、欠陥の形状を記録するためには、写真
撮影するか、粘着テープに転写するしかなく記録性が乏
しいと言う欠点があった。Further, in order to record the shape of the defect, there is no other choice but to take a photograph or transfer it to an adhesive tape, and there is a disadvantage that the recording property is poor.
【0005】[0005]
【発明が解決しようとする課題】上記従来技術は、すべ
て検査員の手動操作による手順で行なっていたが、自動
化及び記録性の改善による高効率化については考慮され
ておらず、昨今のように試験体によっては、社内試験の
他に顧客による検査,官庁による立会検査まで実施する
ケースでは、その都度、同じ検査を繰返し大きな無駄と
なる問題がある。本発明の目的は、この無駄を省くため
磁粉探傷試験を自動化することであり、自動化するに当
って、問題となる観察用カメラの位置,照明用紫外線
が、直接、あるいは間接的にカメラに入射することを防
ぐ方法,検査液によりカメラレンズが汚れることを防止
する方法等を提案して自動化に好適な磁粉探傷装置を提
供することにある。In the above prior arts, all procedures are performed by manual operation of an inspector. However, no consideration has been given to high efficiency due to automation and improvement of recording properties. In some cases, in addition to in-house tests, in cases where inspections by customers and witness inspections by government offices are performed, the same inspections are repeated each time, resulting in a large waste. An object of the present invention is to automate a magnetic particle flaw detection test in order to eliminate this waste. In automating the inspection, the position of an observation camera and illumination ultraviolet rays which are problematic directly or indirectly enter the camera. It is an object of the present invention to provide a magnetic particle flaw detection apparatus suitable for automation by proposing a method of preventing the camera lens from being stained by the test solution and a method of preventing the camera lens from being stained by the test solution.
【0006】[0006]
【課題を解決するための手段】本発明における基本的手
段は、磁粉探傷装置の磁化装置に、試験領域に照明方向
が向けられた照明装置と、前記試験領域に磁粉を懸濁さ
せた検査液の散布方向が向けられた検査液散布装置と、
前記試験領域の中心部に撮像方向が垂直となる姿勢にさ
れた撮像装置とを装着してある磁粉探傷装置であって、
その基本的手段に、特定の波長の蛍光のみを選択的に透
過するフィルタを撮像装置の前面に設けておくこと、さ
らにはそのフィルタよりもさらに前面に開閉自在なシャ
ッタを設けておくことが提案できる。 Basically the hand in the present invention, in order to solve the problems]
The stage is illuminated to the test area by the magnetizing device of the magnetic particle flaw detector.
Lighting device and magnetic powder suspended in the test area
A test solution spraying device in which the spray direction of the sprayed test solution is directed,
Position the camera so that the imaging direction is perpendicular to the center of the test area.
A magnetic particle flaw detector equipped with the obtained imaging device,
The basic means is to selectively transmit only fluorescence of a specific wavelength.
Filter on the front of the imaging device.
Have a filter that can be opened and closed further in front of the filter.
It can be suggested to provide a utter.
【0007】[0007]
【作用】本発明における基本的手段によれば、磁化装置
に照明装置と検査液散布装置と撮像装置とを一体にして
試験面に提供できるので個別の装置をバラバラに試験面
に持ち込むのに比べて自動化し易い上に、検査作業も容
易となる上、一体化するに際して撮像装置を試験中心部
で垂直方向に撮像方向を向けてあるので、磁化装置の向
きや姿勢が変化しても視野や視角の変化が少ないという
作用効果が得られる。 その上、特定の波長の蛍光のみを
選択的に透過するフィルタを撮像装置の前面に設けてあ
るものにあっては、その作用効果に加えて、試験面上の
欠陥像等を清明に撮影するに必要な光をフィルタで選択
的に撮像装置に取り込み、余計な波長の光に邪魔される
ことなく清明な像を撮像できる作用効果が得られ、その
上更に、そのフィルタよりもさらに前面に開閉自在なシ
ャッタを設けてあるものにあっては、撮影時には開いて
いたシャッタを検査液散布作業時に閉じて散布液が撮像
装置側に飛来しても撮像装置やフィルタに散布液が付着
して撮像条件を悪化させるという現象を抑制できる。 According to the basic means of the present invention, a magnetizing device is provided.
The lighting device, the test liquid spraying device and the imaging device are integrated
Since individual devices can be provided on the test surface
In addition to being easier to automate than bringing them into
In addition to being easy to integrate, the imaging device is
, The imaging direction is oriented in the vertical direction.
It is said that there is little change in the field of view and viewing angle even if the attitude changes
An effect can be obtained. In addition, only the specific wavelength of fluorescence
A filter that selectively transmits light is provided on the front of the imaging device.
In addition to the action and effect,
Select the light required to clearly capture defective images, etc. with a filter
Is captured by the image pickup device and is disturbed by light of extra wavelength
The function and effect of being able to capture a clear image without
A filter that can be opened and closed further on the front than the filter
If the camera has a shutter, open it when shooting.
Closes the shutter when spraying the test liquid and captures the spray liquid.
Spray liquid adheres to the imaging device and filter even when it comes to the device side
As a result, it is possible to suppress the phenomenon that the imaging condition is deteriorated.
【0008】[0008]
【実施例】以下、本発明の一実施例を図3により説明す
る。An embodiment of the present invention will be described below with reference to FIG.
【0009】図3の磁化装置100は、電磁石四本の足
の部分に磁化コイルを内蔵しており、そのコイルに電流
を通じることにより、四本の足で囲まれた範囲の試験面
を、試験に必要な強さまで磁化する。同図101は磁極
で、102は走行用車輪、104は車輪支持板である。
磁化装置100にはさらに試験面観察用撮像装置200
(以下カメラと言う)、照明灯250、及び検査液散布
ノズル300を組込一体化したものである。本実施例に
よれば、磁化装置100による試験面の磁化,検査液散
布ノズル300による試験面への検査液散布、照明灯2
50による試験面の照明、カメラ200による試験面の
観察と記録を同時に、あるいは連続して行うことで自動
化を可能にする。The magnetizing apparatus 100 shown in FIG. 3 has a magnetizing coil built into the four legs of the electromagnet, and a current is passed through the coil, so that a test surface in a range surrounded by the four legs can be formed. Magnetize to the strength required for the test. FIG. 101 shows a magnetic pole, 102 is a traveling wheel, and 104 is a wheel support plate.
The magnetizing device 100 further includes a test surface observation imaging device 200.
(Hereinafter referred to as a camera), an illumination lamp 250, and a test liquid spray nozzle 300 are integrated and integrated. According to this embodiment, the magnetizing device 100 magnetizes the test surface, the test solution spray nozzle 300 sprays the test solution on the test surface, and the illumination lamp 2.
The illumination of the test surface by 50 and the observation and recording of the test surface by the camera 200 are performed simultaneously or continuously, thereby enabling automation.
【0010】特に、試験面の観察をテレビカメラで行い
これをビデオテープレコーダに収録することにより、従
来の、写真に撮るか、粘着テープに転写するかによって
行われていた試験結果の記録性を飛躍的に改善すること
が可能になりこれが自動化を実現する決め手となってい
る。[0010] In particular, by observing the test surface with a television camera and recording it on a video tape recorder, the recordability of the test results conventionally performed by taking a photograph or transferring it to an adhesive tape can be improved. Dramatic improvements can be made, and this is the decisive factor in achieving automation.
【0011】カメラ200は磁化装置の鉄心の中心部に
孔をあけてその中に埋め込むように取付けられており、
カメラは常に試験面502の中心を向いている。以下、
その効果を図5及び図6により説明する。図5は、鉄心
の側面にスペーサ280を利用してカメラ200を取付
けた場合を説明したもので、図5(a)のように平面状
の試験面502の中央部に視野260を設定しても、例
えば、隅肉溶接部を試験する図5(b)の場合は視野2
60の中心が試験面502の中心からずれてしまうと言
う不都合が生じる。本実施例によれば図6(a)及び
(b)に示すように、試験面の形状にかかわりなく常に
試験面502の中心に視野の中心を合わせることができ
る。The camera 200 is mounted so as to make a hole in the center of the iron core of the magnetizing device and to embed it in the hole.
The camera is always facing the center of the test surface 502. Less than,
The effect will be described with reference to FIGS. FIG. 5 illustrates a case where the camera 200 is mounted on the side surface of the iron core using the spacer 280. As shown in FIG. 5A, a visual field 260 is set at the center of the planar test surface 502. Also, for example, in the case of FIG.
There is an inconvenience that the center of 60 is shifted from the center of the test surface 502. According to this embodiment, as shown in FIGS. 6A and 6B, the center of the visual field can always be adjusted to the center of the test surface 502 regardless of the shape of the test surface.
【0012】図3の照明灯250は紫外線252を照射
して、蛍光磁粉から蛍光を発生させ、カメラ200によ
って欠陥を検出せしめる働きをするが、試験面502で
反射した紫外線252の一部は直接カメラ200に到達
する。この光は強度が強いためモニタ画面を赤紫色の光
で覆って他の影像を見えなくする。かかる不都合を防止
するために本発明では図4(a)に示すように、カメラ
200の前面に、磁粉が発する蛍光は透過させるが、紫
外線はカットする光学フィルタ231を設けた。これに
より有害な反射紫外線を遮断した。The illuminating lamp 250 shown in FIG. 3 irradiates ultraviolet rays 252 to generate fluorescent light from the fluorescent magnetic powder and has a function of detecting a defect by the camera 200. However, a part of the ultraviolet rays 252 reflected by the test surface 502 is directly. It reaches the camera 200. Since this light has a high intensity, the monitor screen is covered with red-purple light to make other images invisible. In order to prevent such inconvenience, in the present invention, as shown in FIG. 4A, an optical filter 231 for transmitting the fluorescence emitted from the magnetic powder but cutting the ultraviolet light is provided on the front surface of the camera 200. As a result, harmful reflected ultraviolet rays were blocked.
【0013】磁粉探傷試験では、試験面に磁粉を懸濁さ
せた検査液を散布するが、そのとき試験面で飛散した検
査液の飛沫がカメラ200のレンズに付着するのを防止
するためにシャッタ232を設けた。シャッタ232は
アクチュエータ234で駆動されて開閉し、試験面を観
察するときに開となり検査液を散布するときは閉じるこ
とで、カメラのレンズを保護している。In the magnetic particle flaw detection test, a test solution in which magnetic particles are suspended is sprayed on the test surface. At this time, a shutter is used to prevent the test solution droplets scattered on the test surface from adhering to the lens of the camera 200. 232 were provided. The shutter 232 is driven by the actuator 234 to open and close, and is opened when observing the test surface and closed when spraying the test liquid, thereby protecting the camera lens.
【0014】[0014]
【発明の効果】請求項1の発明によれば、磁粉探傷試験
に必要な複数の手段を一体化して自動化し易い上に作業
が容易に行え、且つ欠陥を撮像する撮像装置の視野中心
を試験面の形状に関わらず常に試験面の中心に維持でき
る。 請求項2の発明によれば、請求項1の発明による効
果に加えて、光学的フイルタによって撮像装置による撮
像の清明度合いを向上できる。 請求項3の発明によれ
ば、請求項2の発明による効果に加えて、検査液の飛沫
対策が解決できて撮像装置による撮像の清明度合いを一
層向上できる上、磁粉探傷試験を自動化する上で障害と
なっていた三つの問題点、つまり、撮像装置の位置と視
野,紫外線等撮像の清明化を妨害する波長の光の防除,
検査液の飛沫対策とが同時に解決され、磁粉探傷試験の
自動化の道が開け、磁粉探傷試験に於ける個人差やヒュ
ーマンエラーが排除されて、信頼性が向上するほか、記
録性の改善や試験プロセスの自動化による能率向上が可
能となる。 According to the first aspect of the present invention, a magnetic particle inspection test
Easy to automate by integrating multiple means necessary for
The center of the field of view of the imaging device that can easily perform defects and image defects
Can always be maintained at the center of the test surface regardless of the shape of the test surface.
You. According to the invention of claim 2, the effect of the invention of claim 1 is obtained.
In addition to the results, the optical
The clarity of the image can be improved. According to the invention of claim 3
For example, in addition to the effect of the invention of claim 2, the test liquid is sprayed.
Measures can be resolved and the degree of clarity of imaging by the imaging device can be reduced.
Layers can be improved and obstacles in automating magnetic particle inspection
The three problems that have been addressed, namely the position of the imaging device and
Control of light at wavelengths that interfere with image clarification, such as fields and ultraviolet light,
At the same time, measures against splashing of the test solution were solved,
This opens the way for automation, eliminating individual differences and human errors in magnetic particle flaw detection testing, improving reliability, and improving recordability and improving efficiency by automating the testing process.
【図1】磁粉探傷の手順の説明図。FIG. 1 is an explanatory view of a procedure of magnetic particle flaw detection.
【図2】磁粉探傷の原理説明図。FIG. 2 is a diagram illustrating the principle of magnetic particle flaw detection.
【図3】磁化装置部の正面図(a),平面図(b),側
面図(c)。FIG. 3 is a front view (a), a plan view (b), and a side view (c) of a magnetizing device.
【図4】光学フィルタとカメラ保護板を設けた側面図
(a),平面図(b)。FIG. 4 is a side view (a) and a plan view (b) provided with an optical filter and a camera protection plate.
【図5】カメラの取付位置による不具合の説明図。FIG. 5 is an explanatory diagram of a defect due to a mounting position of a camera.
【図6】本発明のカメラの位置の有用性を示す説明図。FIG. 6 is an explanatory diagram showing usefulness of the position of the camera of the present invention.
100…磁化装置、200…撮像装置(カメラ)、23
1…光学フィルタ、232…可動塞ぎ板(シャッタ)、
233…軸受、234…アクチュエータ、250…紫外
線照明灯、251…ブラケット、502…試験面。100: magnetizing device, 200: imaging device (camera), 23
1: optical filter, 232: movable closing plate (shutter),
233 bearing, 234 actuator, 250 ultraviolet light, 251 bracket, 502 test surface.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 小巻 一志 茨城県日立市幸町三丁目2番1号 日立 エンジニアリング株式会社内 (56)参考文献 特開 昭55−1510(JP,A) 特開 昭60−117148(JP,A) 特開 昭51−107183(JP,A) 実開 平1−118359(JP,U) (58)調査した分野(Int.Cl.7,DB名) G01N 21/91 G01N 27/84 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Kazushi Komaki 3-2-1, Sachimachi, Hitachi-shi, Ibaraki Pref. Hitachi Engineering Co., Ltd. (56) References JP-A-55-1510 (JP, A) JP-A-60-117148 (JP, A) JP-A-51-107183 (JP, A) JP-A-1-118359 (JP, U) (58) Fields investigated (Int. Cl. 7 , DB name) G01N 21 / 91 G01N 27/84
Claims (3)
明方向が向けられた照明装置と、前記試験領域に磁粉を
懸濁させた検査液の散布方向が向けられた検査液散布装
置と、前記試験領域の中心部に撮像方向が垂直となる姿
勢にされた撮像装置とを装着してある磁粉探傷装置。1. A test device, comprising: a magnetizing device of a magnetic particle flaw detector;
A lighting device oriented in the bright direction and a magnetic powder in the test area.
Test solution sprayer with spray direction of suspended test solution
With the imaging direction perpendicular to the center of the test area
A magnetic particle flaw detector equipped with an activated imaging device.
を選択的に透過するフィルタを撮像装置の前面に設けた
ことを特徴とする磁粉探傷装置。2. The method according to claim 1, wherein only fluorescence of a specific wavelength is used.
Filter is provided on the front of the imaging device to selectively transmit light
Magnetic particle flaw detector characterized by the above-mentioned .
前面に開閉自在なシャッタを設けてあることを特徴とす
る磁粉探傷装置。3. The method according to claim 2, further comprising:
A shutter that can be opened and closed on the front is provided.
Magnetic particle flaw detector that.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP27068491A JP3184267B2 (en) | 1991-10-18 | 1991-10-18 | Magnetic particle flaw detector |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP27068491A JP3184267B2 (en) | 1991-10-18 | 1991-10-18 | Magnetic particle flaw detector |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH05107202A JPH05107202A (en) | 1993-04-27 |
JP3184267B2 true JP3184267B2 (en) | 2001-07-09 |
Family
ID=17489511
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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JP27068491A Expired - Fee Related JP3184267B2 (en) | 1991-10-18 | 1991-10-18 | Magnetic particle flaw detector |
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Families Citing this family (9)
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ES2108617B1 (en) * | 1994-11-17 | 1998-07-01 | Tecnologico Robotiker Centro | PROCEDURE AND MACHINE FOR AUTOMATIC DETECTION OF CRACKS IN IRON PARTS. |
JP4045742B2 (en) | 1999-03-31 | 2008-02-13 | 株式会社日立製作所 | Nondestructive inspection method and apparatus |
EP1096249B1 (en) * | 1999-10-26 | 2013-05-01 | Hitachi-GE Nuclear Energy, Ltd. | Nondestructive flaw inspection method and apparatus |
CZ305605B6 (en) * | 2012-12-20 | 2016-01-06 | Vysoké Učení Technické V Brně | Measuring method for making inspection snapshots of the surface of test boards contaminated with fusing agents |
KR101705034B1 (en) | 2015-09-10 | 2017-02-09 | 주식회사 에네스지 | Magnetic Particle Inspection Device for Rotor Bore of Turbine |
CN106353398A (en) * | 2016-08-18 | 2017-01-25 | 曹洽瑄 | Chained multi-station automatic turnover conveyor for nondestructive testing of workpieces to be tested |
CN113804749B (en) * | 2020-06-15 | 2024-03-08 | 宝山钢铁股份有限公司 | Deep hole fluorescent imaging device for magnetic powder inspection of inner surface of steel pipe and application method of deep hole fluorescent imaging device |
CN113358739B (en) * | 2021-06-30 | 2024-07-09 | 常州工学院 | Magnetic particle inspection detection device based on binocular image fusion technology |
CN117451830B (en) * | 2023-10-26 | 2024-03-29 | 江阴市精成数控有限公司 | Fluorescent magnetic powder sand blasting bearing workpiece defect detection system |
-
1991
- 1991-10-18 JP JP27068491A patent/JP3184267B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
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JPH05107202A (en) | 1993-04-27 |
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