JPH0743348A - Wet magnetic powder flaw detection testing method and removing device for surplus magnetic powder used for it - Google Patents
Wet magnetic powder flaw detection testing method and removing device for surplus magnetic powder used for itInfo
- Publication number
- JPH0743348A JPH0743348A JP5208999A JP20899993A JPH0743348A JP H0743348 A JPH0743348 A JP H0743348A JP 5208999 A JP5208999 A JP 5208999A JP 20899993 A JP20899993 A JP 20899993A JP H0743348 A JPH0743348 A JP H0743348A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic powder
- inspected
- water
- water tank
- fluorescent
- 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
- 239000006247 magnetic powder Substances 0.000 title claims abstract description 108
- 238000001514 detection method Methods 0.000 title claims description 22
- 238000012360 testing method Methods 0.000 title abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 94
- 230000002950 deficient Effects 0.000 claims abstract description 35
- 238000010998 test method Methods 0.000 claims description 13
- 230000004907 flux Effects 0.000 claims description 8
- 238000007689 inspection Methods 0.000 abstract description 21
- 238000000034 method Methods 0.000 abstract description 11
- 239000007788 liquid Substances 0.000 abstract description 8
- 229910000975 Carbon steel Inorganic materials 0.000 abstract description 7
- 239000010962 carbon steel Substances 0.000 abstract description 7
- 238000013019 agitation Methods 0.000 abstract 2
- 229910000831 Steel Inorganic materials 0.000 description 14
- 239000010959 steel Substances 0.000 description 14
- 239000006249 magnetic particle Substances 0.000 description 10
- 230000007547 defect Effects 0.000 description 9
- 238000007796 conventional method Methods 0.000 description 5
- 238000011437 continuous method Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- 238000007667 floating Methods 0.000 description 2
- 238000007654 immersion Methods 0.000 description 2
- 239000000696 magnetic material Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- LPXPTNMVRIOKMN-UHFFFAOYSA-M sodium nitrite Chemical compound [Na+].[O-]N=O LPXPTNMVRIOKMN-UHFFFAOYSA-M 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000007850 fluorescent dye Substances 0.000 description 1
- 239000008235 industrial water Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 230000005415 magnetization Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 235000010288 sodium nitrite Nutrition 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000010561 standard procedure Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000004078 waterproofing Methods 0.000 description 1
Landscapes
- Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、湿式磁粉探傷試験方法
及び該方法に用いる余剰磁粉除去装置に係り、欠陥部に
付着せずに被検査物表面に残留している余剰蛍光磁粉を
適切に除去でき、精度の高い湿式磁粉探傷試験結果が得
られる新規技術手段を提供するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wet magnetic powder flaw detection test method and a device for removing surplus magnetic powder used in the method, which is suitable for removing surplus fluorescent magnetic powder remaining on the surface of an object to be inspected without adhering to a defective portion. The present invention provides a new technical means that can be removed and can obtain highly accurate wet magnetic particle flaw detection test results.
【０００２】[0002]
【従来の技術】周知の通り、鉄鋼材料の磁粉探傷試験方
法は、ＪＩＳ Ｇ ０５６５−１９９２に規格化されて
いる。上掲ＪＩＳ規格の内に、磁性体（例えば角鋼片）
からなる被検査物を磁化し、その表面に蛍光磁粉（通
常、純鉄粒子粉末や四三酸化鉄粒子粉末等の粒子表面
に、紫外線照射により励起されて黄色〜黄緑色に発光す
る蛍光顔料や蛍光染料を付着させたものが用いられてい
る）を分散した磁粉液を接触させて欠陥部に生じる漏洩
磁束により該欠陥部に蛍光磁粉を付着させた後、当該欠
陥部に付着している蛍光磁粉模様によって欠陥部の存在
を探傷するという態様を採る磁粉探傷試験方法がある。
なお、蛍光磁粉模様の観察は紫外線灯照射下において目
視又はテレビカメラによって行われる。2. Description of the Related Art As is well known, a method of magnetic particle flaw detection test for steel materials is standardized in JIS G 0565-1992. A magnetic material (for example, square steel piece) within the above JIS standards
Magnetize an object to be inspected, and fluorescent magnetic powder on its surface (usually on the surface of particles such as pure iron particle powder or triiron tetraoxide particle powder, a fluorescent pigment that is excited by ultraviolet irradiation to emit yellow to yellow-green color or (A fluorescent dye is used.) Dispersed magnetic powder liquid is brought into contact with the defective magnetic field to cause the magnetic flux to leak, and the fluorescent magnetic powder is adhered to the defective area. There is a magnetic particle flaw detection test method in which flaw detection is performed on the existence of a defective portion by a magnetic powder pattern.
The fluorescent magnetic powder pattern is observed visually or by a television camera under irradiation of an ultraviolet lamp.
【０００３】上記態様を採る磁粉探傷試験方法は、一般
に「湿式磁粉探傷試験方法」と呼ばれ、鉄鋼業界におい
ては角ビレットや丸ビレットなどの鋼材検査に汎用さ
れ、自動車業界においては鋼製ナックルアームや鋼製シ
ャフトなどの部品検査に汎用されている。The magnetic powder flaw detection test method adopting the above-mentioned aspect is generally called a "wet magnetic powder flaw detection test method" and is generally used in the steel industry for inspecting steel materials such as square billets and round billets, and in the automobile industry, a steel knuckle arm. It is commonly used to inspect parts such as steel and steel shafts.
【０００４】ところで、湿式磁粉探傷試験方法の実施に
際し、探傷精度を高めるためには、欠陥部に蛍光磁粉を
付着させた後、欠陥部に付着せずに被検査物表面に残留
している余剰蛍光磁粉を除去する必要がある。何故な
ら、被検査物表面の欠陥部以外の個所、換言すれば、健
全部に蛍光磁粉が残留していると、紫外線灯照射下にお
ける観察時に、当該残留している蛍光磁粉も発光するた
め、欠陥部に付着している蛍光磁粉模様を明確に観察す
ることが困難となるからである。特に、上記観察をテレ
ビカメラにより行って得られた映像信号を処理すること
により探傷する場合には、健全部に残留している蛍光磁
粉の発光がノイズとなるため精度の高い試験結果を得る
ことが非常に困難となる。なお、当業界において、上記
した紫外線灯照射下の観察時において健全部に残留して
いる蛍光磁粉が発光する現象を「バックグランド現象」
と呼んでいる。In order to improve the flaw detection accuracy when performing the wet magnetic powder flaw detection test method, after the fluorescent magnetic powder is attached to the defective portion, the surplus remaining on the surface of the object to be inspected without adhering to the defective portion. It is necessary to remove the fluorescent magnetic powder. Because, the spots other than the defective portion of the surface of the object to be inspected, in other words, when the fluorescent magnetic powder remains in the sound portion, during observation under irradiation of an ultraviolet lamp, the remaining fluorescent magnetic powder also emits light, This is because it becomes difficult to clearly observe the fluorescent magnetic powder pattern attached to the defective portion. In particular, when flaw detection is performed by processing the video signal obtained by performing the above-mentioned observation with a television camera, it is necessary to obtain highly accurate test results because the emission of the fluorescent magnetic powder remaining in the sound part becomes noise. Will be very difficult. In addition, in the industry, the phenomenon in which the fluorescent magnetic powder remaining in the sound part emits light during the observation under the irradiation of the ultraviolet light is referred to as a “background phenomenon”.
I am calling.
【０００５】従来、湿式磁粉探傷試験方法におけるバッ
クグランド現象を解消するために採られている技術的手
段には、Ａ：磁化された被検査物表面の欠陥部に蛍光磁
粉を付着させた後、当該被検査物表面に乾燥圧縮空気を
ノズルを用いて吹き付けることによって、欠陥部に付着
せずに被検査物表面に残留している余剰蛍光磁粉を除去
しようとするもの（特開昭 50-104687号公報参照）と
Ｂ：磁化された被検査物表面の欠陥部に蛍光磁粉を付着
させた後、当該被検査物表面に水をノズルを用いて散水
することによって、欠陥部に付着せずに被検査物表面に
残留している余剰蛍光磁粉を除去しようとするもの（特
開昭62-25253号公報参照）とがある。Conventionally, the technical means employed to eliminate the background phenomenon in the wet magnetic powder flaw detection test method is as follows: A: After attaching fluorescent magnetic powder to a defective portion on the surface of a magnetized object to be inspected, An attempt is made to remove excess fluorescent magnetic powder remaining on the surface of the object to be inspected without adhering to the defective portion by blowing dry compressed air onto the surface of the object to be inspected using a nozzle (Japanese Patent Laid-Open No. 50-104687). No.) and B: After the fluorescent magnetic powder is attached to the defective portion on the magnetized surface of the inspection object, water is sprayed on the surface of the inspection object using a nozzle so that the inspection object surface does not adhere to the defect area. There is one that attempts to remove the excess fluorescent magnetic powder remaining on the surface of the object to be inspected (see JP-A-62-25253).
【０００６】[0006]
【発明が解決しようとする課題】前掲Ａ及びＢの技術的
手段によってバックグランド現象の解消をはかる場合に
は、次の通りの問題点がある。第一の問題点は、Ａ及び
Ｂのいずれの技術的手段も、前掲各公報に例示されてい
る鋼管や鋼角材或いは鋼板のような単純形状の被検査物
には適用できるが、自動車用ナックルアームやアクスル
シャフトの如き凹凸部をもつ複雑形状の被検査物には適
用できない点である。即ち、Ａ及びＢの技術的手段を複
雑形状の被検査物に適用する場合には、凹凸部周囲に存
在する余剰蛍光磁粉を充分に除去できないので、バック
グランド現象を解消することができず、また、バックグ
ランド現象が解消できるまで凹凸部周囲に存在する余剰
蛍光磁粉を除去しようとすれば、欠陥部に付着している
蛍光磁粉模様を乱したり、消失させてしまうことになる
からである。In the case of attempting to eliminate the background phenomenon by the technical means of A and B, there are the following problems. The first problem is that both the technical means A and B can be applied to an inspected object having a simple shape such as a steel pipe, a steel square bar, or a steel plate exemplified in the above-mentioned respective publications, but the knuckle for an automobile. This is a point that cannot be applied to an inspected object having a complicated shape having an uneven portion such as an arm or an axle shaft. That is, when the technical means of A and B are applied to an inspected object having a complicated shape, the excess fluorescent magnetic powder existing around the uneven portion cannot be sufficiently removed, so that the background phenomenon cannot be eliminated, In addition, if it is attempted to remove the surplus fluorescent magnetic powder existing around the uneven portion until the background phenomenon can be eliminated, the fluorescent magnetic powder pattern adhered to the defective portion will be disturbed or disappeared. .
【０００７】第二の問題点は、Ａ及びＢの技術的手段を
単純形状の被検査物に適用すれば、勿論、適用しない場
合と比較してバックグランド現象は減少するが、バック
グランド現象を充分に解消することはできない点であ
る。即ち、本発明者の実験結果によれば、Ａ及びＢの技
術的手段を適用した場合、ノズルから出た空気又は水が
当った個所とその近傍の余剰蛍光磁粉は被検査物表面に
ある水中に浮遊した状態となって被検査物表面から離れ
るが、この浮遊状態にある余剰蛍光磁粉の全てが当該水
と共に被検査物表面から除去されることはなく、その一
部は再び被検査物表面に沈着することが要因で、バック
グランド現象を充分に解消することができないことが判
った。The second problem is that if the technical means of A and B are applied to an object to be inspected having a simple shape, the background phenomenon is reduced as compared with the case where it is not applied. This is a point that cannot be fully resolved. That is, according to the experimental results of the present inventor, when the technical means of A and B are applied, the portion where the air or water emitted from the nozzle hits and the surplus fluorescent magnetic powder in the vicinity thereof are in the water on the surface of the inspection object. However, all of the excess fluorescent magnetic powder in the floating state is not removed from the surface of the object to be inspected together with the water, but part of it is again surface of the object to be inspected. It was found that the background phenomenon cannot be sufficiently eliminated due to the deposition on the surface.
【０００８】そこで、本発明者は、前記諸問題点を解決
できる湿式磁粉探傷法におけるバックグランド現象を解
消するための新規技術的手段の提供を技術的課題として
試行錯誤的な数多くの実験を重ねた結果、磁化された被
検査物表面の欠陥部に蛍光磁粉を付着させた後、当該被
検査物を特定条件の下において流水中に浸漬して引き上
げることによって、欠陥部に付着せずに被検査物表面に
残留している余剰蛍光磁粉を除去する場合には、被検査
物が凹凸部をもつ複雑形状のものであっても、欠陥部に
付着している蛍光磁粉模様を乱したり、消失させたりす
ることなくバックグランド現象が充分に解消できるまで
余剰蛍光磁粉を除去することができ、且つ、被検査物表
面から離れた余剰蛍光磁粉が再び被検査物表面に沈着す
ることを防止できるという刮目すべき新知見を得、本発
明を完成した。Therefore, the present inventor has conducted numerous trial and error experiments as a technical task to provide a new technical means for solving the background phenomenon in the wet magnetic particle flaw detection method capable of solving the above-mentioned problems. As a result, after the fluorescent magnetic powder is attached to the defective portion of the magnetized inspection object surface, the inspection object is immersed in running water under specific conditions and pulled up, so that the inspection object is not attached to the defect portion. When removing the surplus fluorescent magnetic powder remaining on the surface of the inspection object, even if the inspection object has a complicated shape with irregularities, it disturbs the fluorescent magnetic powder pattern attached to the defect, It is possible to remove the excess fluorescent magnetic powder until the background phenomenon is sufficiently eliminated without disappearing, and it is possible to prevent the excess fluorescent magnetic powder separated from the surface of the inspection object from being deposited again on the surface of the inspection object. The new findings should be Katsumoku that obtained, and have completed the present invention.
【０００９】[0009]
【課題を解決するための手段】前記技術的課題は、次の
通りの本発明によって達成できる。即ち、本発明は、磁
化された被検査物の表面に蛍光磁粉を分散した磁粉液を
接触させて欠陥部に生じる漏洩磁束により該欠陥部に蛍
光磁粉を付着させ、次いで、当該被検査物を磁石又は磁
気フィルターの存在下に流水速度12 m／min 〜60 m／mi
n の流水中に浸漬して引き上げることによって欠陥部に
付着せずに被検査物表面に残留していた余剰蛍光磁粉を
除去した後、欠陥部に付着している蛍光磁粉模様によっ
て欠陥部の存在を探傷することを特徴とする湿式磁粉探
傷試験方法及び該方法に用いる余剰磁粉除去装置であ
る。The above technical problems can be achieved by the present invention as follows. That is, the present invention, the magnetic powder liquid in which the fluorescent magnetic powder is dispersed is brought into contact with the surface of the magnetized object to be inspected, and the magnetic flux is attached to the defective portion by the leakage magnetic flux generated in the defective portion, and then the object to be inspected is Flow velocity of 12 m / min to 60 m / mi in the presence of magnet or magnetic filter
Excessive fluorescent magnetic powder remaining on the surface of the object to be inspected without being adhered to the defective part by immersing it in running water of n and pulling it up, and then there is a defective part due to the fluorescent magnetic powder pattern adhering to the defective part The present invention relates to a wet magnetic powder flaw detection test method and a surplus magnetic powder removal device used in the method.
【００１０】本発明に係る余剰磁粉除去装置とは、上記
の通りの本発明に係る湿式磁粉探傷試験方法に用いられ
るものであって、水槽と該水槽に充填される水に流水速
度12m／min 〜60 m／min の水流を発生させる攪拌機と
該水槽中に設置された磁石とからなる余剰磁粉除去装置
並びに水槽と該水槽に充填される水に流水速度12 m／mi
n 〜60 m／min の水流を発生させるポンプ循環機構と該
ポンプ循環機構の水路中に設置された磁気フィルターと
からなる余剰磁粉除去装置である。The surplus magnetic powder removing device according to the present invention is used in the wet magnetic powder flaw detection test method according to the present invention as described above, and the running speed of the water tank and the water filled in the water tank is 12 m / min. A surplus magnetic powder removing device consisting of a stirrer that generates a water flow of up to 60 m / min and a magnet installed in the water tank, and a running speed of 12 m / mi for the water tank and the water filled in the water tank.
It is a device for removing excess magnetic powder, which comprises a pump circulation mechanism for generating a water flow of n to 60 m / min and a magnetic filter installed in a water channel of the pump circulation mechanism.
【００１１】本発明の構成をより詳しく説明すれば、次
の通りである。先ず、本発明に係る湿式磁粉探傷試験方
法は、その余剰蛍光磁粉除去手段を除けば、従来の湿式
磁粉探傷試験方法と変るところはなく、前掲ＪＩＳ規格
に従って実施できる。従って、被検査物としては、鋼材
の如き磁化可能な磁性体が対象となり、その磁化には、
周知の残留法や連続法が適用でき、蛍光磁粉には、市販
の湿式磁粉探傷試験用蛍光磁粉（例えば、スーパーマグ
ナＬＹシリーズ：商品名：マークテック株式会社製）が
適用でき、適用に当っては、常法に従って、水１ｌ当り
0.5〜1.0程度を分散させ磁粉液を調製すればよく、ま
た、当該磁粉液を被検査物に接触させるに当っても、常
法に従って、被検査物を磁粉液中に浸漬して引き上げる
手法や被検査物に磁粉液を散布する手法を採ればよい。
そして、余剰蛍光磁粉を除去した後も、常法に従って、
紫外線灯（ブラックライト）照射下において目視又はテ
レビカメラによって欠陥部に付着している蛍光磁粉模様
を観察する。The structure of the present invention will be described in more detail as follows. First, the wet magnetic powder flaw detection test method according to the present invention is the same as the conventional wet magnetic powder flaw detection test method except for the excess fluorescent magnetic powder removal means, and can be carried out in accordance with the above-mentioned JIS standard. Therefore, the inspected object is a magnetizable magnetic material such as steel, and its magnetization is
A well-known residual method or continuous method can be applied, and commercially available fluorescent magnetic powder for wet magnetic particle flaw testing (for example, Super Magna LY series: trade name: manufactured by Marktec Co., Ltd.) can be applied to the fluorescent magnetic powder. Per 1 liter of water according to the standard method
It is only necessary to disperse about 0.5 to 1.0 to prepare a magnetic powder solution, and also in contacting the magnetic powder solution with the object to be inspected, a method of immersing the object to be inspected in the magnetic particle solution and pulling it up according to a conventional method or A method of spraying the magnetic powder liquid on the inspection object may be adopted.
And, even after removing the excess fluorescent magnetic powder, according to the usual method,
Under the irradiation of an ultraviolet ray lamp (black light), the fluorescent magnetic powder pattern adhering to the defective portion is observed visually or with a television camera.
【００１２】本発明においては、磁化された被検査物表
面の欠陥部に蛍光磁粉を付着させた後、当該被検査物を
磁石又は磁気フィルターの存在下に流水速度12 m／min
〜60m／min の流水中に浸漬して引き上げるという余剰
蛍光磁粉除去手段によって、欠陥部に付着せずに被検査
物表面に残留している余剰蛍光磁粉を除去する。In the present invention, after the fluorescent magnetic powder is attached to the magnetized defect on the surface of the object to be inspected, the object to be inspected is allowed to flow at a flow rate of 12 m / min in the presence of a magnet or a magnetic filter.
Excessive fluorescent magnetic powder remaining on the surface of the object to be inspected without adhering to the defective portion is removed by the excessive fluorescent magnetic powder removing means of immersing and pulling up in running water of -60 m / min.
【００１３】磁石は、周知の永久磁石又は電磁石を用い
ることができ、磁気フィルターは市販品（例えば、マグ
ネットフィルターＣＳＣ型：商品名：株式会社ダルトン
製）を用いればよい。As the magnet, a well-known permanent magnet or electromagnet can be used, and as the magnetic filter, a commercially available product (for example, magnet filter CSC type: trade name: Dalton Co., Ltd.) may be used.
【００１４】流水速度は、上記範囲に設定する必要があ
り、12 m／min 未満では余剰蛍光磁粉の除去を充分に行
えないのでバックグランド現象が改善できず、60 m／mi
n を越えると欠陥部に付着している蛍光磁粉模様の一部
又は全部が消失してしまう。本発明者は数多くの実験結
果から上記範囲の流水速度に設定した場合には、バック
グランド現象が可及的に解消されてコントラストよく明
瞭な蛍光磁粉模様が観察できることを確認している。な
お、浸漬時間は、通常、約３〜10秒間程度で充分である
が、被検査物の寸法・形状に応じて延長することもでき
る。所要流水速度の設定は、水を充填した水槽に攪拌機
を付設し、その攪拌羽回転数を制御することによって行
ったり、或いは、水を充填した水槽にポンプ循環機構を
付設し、そのポンプ回転数を制御することによって行え
ばよく、攪拌機やポンプ循環機構は周知のものを用いれ
ばよい。なお、水を充填した水槽に、必要ある場合に
は、防錆剤（例えば、亜硝酸ソーダ、トリエタノールア
ミン等）を添加して置くこともできる。It is necessary to set the flowing water velocity within the above range, and if it is less than 12 m / min, the excess fluorescent magnetic particles cannot be removed sufficiently, so that the background phenomenon cannot be improved and 60 m / mi is required.
If it exceeds n, some or all of the fluorescent magnetic powder pattern adhered to the defective portion disappears. The present inventor has confirmed from a number of experimental results that the background phenomenon can be eliminated as much as possible and a clear fluorescent magnetic powder pattern can be observed with good contrast when the flowing water velocity is set within the above range. The immersion time is usually about 3 to 10 seconds, but it may be extended depending on the size and shape of the object to be inspected. The required water flow rate is set by attaching a stirrer to the water tank filled with water and controlling the number of rotations of the stirring blades, or by attaching a pump circulation mechanism to the water tank filled with water and then changing the pump rotation speed. It is sufficient to carry out the above-mentioned control, and a well-known stirrer and pump circulation mechanism may be used. If necessary, a rust preventive agent (for example, sodium nitrite, triethanolamine, etc.) can be added and placed in the water tank filled with water.
【００１５】次に、本発明に係る余剰磁粉除去装置の具
体的態様は、図１〜図３に示す通りである。図１に示す
態様では、水11を充填した円筒状水槽１に攪拌機２が付
設されており、当該円筒状水槽１の内底部には磁石３が
設置されている。なお、同図には自動車用鋼製ナックル
アームが浸漬されている状態を示した。Next, a concrete mode of the surplus magnetic powder removing device according to the present invention is as shown in FIGS. In the embodiment shown in FIG. 1, a stirrer 2 is attached to a cylindrical water tank 1 filled with water 11, and a magnet 3 is installed on the inner bottom of the cylindrical water tank 1. The figure shows a state in which a steel knuckle arm for an automobile is immersed.
【００１６】図２に示す態様では、水11を充填した長方
形箱状水槽10にポンプ循環機構20が付設されており、当
該ポンプ循環機構20の水路21中には磁気フィルター30が
設置されている。なお、同図には自動車用鋼製リヤーア
クスルシャフトが浸漬されている状態を示した。図１及
び図２において、図中の矢印は水流の方向を示してお
り、また、ナックルアーム及びリヤーアクスルシャフト
の吊下げ具は図示していない。In the embodiment shown in FIG. 2, a pump circulation mechanism 20 is attached to a rectangular box-shaped water tank 10 filled with water 11, and a magnetic filter 30 is installed in a water passage 21 of the pump circulation mechanism 20. . The figure shows a state in which a steel rear axle shaft for an automobile is immersed. 1 and 2, the arrows in the drawings indicate the direction of the water flow, and the knuckle arm and the suspension device for the rear axle shaft are not shown.
【００１７】図１及び図２に示す余剰磁粉除去装置の流
水中に、蛍光磁粉が欠陥部に付着している被検査物を浸
漬して引き上げるに当って、当該被検査物が磁化時に使
用した磁化機構から取り外された状態であっても、通常
は、残留磁気によって欠陥部に蛍光磁粉が付着している
から浸漬・引き上げによって該蛍光磁粉が脱落すること
はないが、被検査物の寸法・形状或いは浸漬時間等によ
って脱落する可能性を考慮する必要がある場合には、被
検査物を水槽中において磁化する磁化装置を付設すれば
よい。When the object to be inspected with the fluorescent magnetic particles adhered to the defect portion is dipped in the running water of the excess magnetic particle removing device shown in FIGS. 1 and 2 and pulled up, the object to be inspected was used when magnetized. Even if the fluorescent magnetic powder is removed from the magnetizing mechanism, the fluorescent magnetic powder is usually attached to the defect due to remanence, so the fluorescent magnetic powder does not fall off by dipping / pulling up. When it is necessary to consider the possibility of falling off due to the shape or the immersion time, a magnetizing device for magnetizing the inspection object in the water tank may be attached.
【００１８】図２に示した態様の余剰磁粉除去装置に上
記磁化装置を付設した態様を図３に示す。図３に示す態
様は、水11を充填した長方形箱状水槽10にポンプ循環機
構20が付設されており、当該ポンプ循環機構20の水路21
中には磁気フィルター30が設置されていると共に、周知
の軸通電法に使用する磁化機構が付設されており被検査
物の両端部には該磁化機構の通電パット40、40′が当着
される。なお、同図には自動車用鋼製リヤーアクスルシ
ャフトが浸漬されており、その両端部に通電パット40、
40′が当着されている状態を示した。図３において、図
中の矢印は水流の方向を示しており、また、リヤーアク
スルシャフトの吊下げ具及び通電パット40、40′以外の
磁化機構（磁化ケーブル、磁化電源等）は図示していな
い。FIG. 3 shows a mode in which the above magnetizing device is attached to the surplus magnetic powder removing device shown in FIG. In the embodiment shown in FIG. 3, a pump circulation mechanism 20 is attached to a rectangular box-shaped water tank 10 filled with water 11, and a water channel 21 of the pump circulation mechanism 20 is provided.
A magnetic filter 30 is installed inside, and a magnetizing mechanism used for the well-known axial energization method is additionally provided. The energizing pads 40 and 40 'of the magnetizing mechanism are attached to both ends of the object to be inspected. It In the figure, the steel rear axle shaft for automobiles is immersed, and the electric pads 40,
The 40 'indicates that it is worn. In FIG. 3, the arrows in the figure indicate the direction of the water flow, and the magnetizing mechanism (magnetizing cable, magnetizing power source, etc.) other than the suspension tool for the rear axle shaft and the energizing pads 40, 40 'are not shown. .
【００１９】なお、図２及び図３に示した長方形箱状水
槽10を用いる場合には、必要に応じて当該水槽内に整流
板を設ければ水流の安定化がはかれる。When the rectangular box-shaped water tank 10 shown in FIGS. 2 and 3 is used, the flow of water can be stabilized by providing a rectifying plate in the water tank if necessary.
【００２０】[0020]
【作用】本発明においては、磁化された被検査物表面の
欠陥部に蛍光磁粉を付着させた後、当該被検査物を流水
速度12 m／min 〜60 m／min の流水中に浸漬すると、被
検査物表面に残留している余剰蛍光磁粉は水中に浮遊し
た状態で該表面から離れて水の流れに従って速やかに移
動するから再び被検査物表面に沈着することはない。そ
して、流水中に浮遊した状態で移動している余剰蛍光磁
粉は磁石又は磁気フィルターによって収束補捉される。In the present invention, after the fluorescent magnetic powder is adhered to the defective portion of the magnetized surface of the object to be inspected, the object to be inspected is immersed in running water having a water flow rate of 12 m / min to 60 m / min, The surplus fluorescent magnetic powder remaining on the surface of the inspection object does not deposit again on the surface of the inspection object because it floats in the water and moves away from the surface quickly according to the flow of water. Then, the surplus fluorescent magnetic particles moving in a state of floating in the running water are converged and captured by the magnet or the magnetic filter.
【００２１】また、凹凸部をもつ複雑形状の被検査物を
対象とする場合には余剰蛍光磁粉は凹凸部のエッジに残
留していることが多い（なお、欠陥部に生じる漏洩磁束
に比較すれば弱いものではあるがエッジにも漏洩磁束が
生じる。）が、当該被検査物を流水中に浸漬すると、凹
凸部のエッジ周辺では流速が早くなると共に乱流が生じ
るから、当該エッジ周辺に残留している余剰蛍光磁粉が
容易に除去される。In addition, when an object to be inspected having a complicated shape having a concavo-convex portion is targeted, surplus fluorescent magnetic powder is often left on the edge of the concavo-convex portion (note that the leakage magnetic flux generated in the defective portion is different from that in the defective portion). However, if the DUT is immersed in running water, the flow velocity becomes faster and turbulent flow occurs around the edge of the uneven part, so that it remains around the edge. Excessive fluorescent magnetic powder is easily removed.
【００２２】[0022]
【実施例】以下に、本発明の実施例を挙げる。 実施例１ 自動車用炭素鋼製ナックルアームを被検査物とし、当該
被検査物を、常法に従って、残留法により磁化し、その
検査面に蛍光磁粉ＬＹ−５０００（商品名：マークテッ
ク株式会社製）を１ｌ当り0.8g分散させた磁粉液を接触
させた。一方、櫂型攪拌機が付設されている直径50cmの
円筒状水槽の内底に市販の永久磁石（ＳＵＳ被覆ネオジ
オブロン：磁束密度９０００ガウス）を設置した余剰磁
粉除去装置を準備し、当該水槽に水100lを充填し、攪拌
機を回転させて、水槽内の流水速度を24 m／min に設定
した。上記水槽内の流水速度24 m／min の流水中に、前
記磁粉液に接触後の被検査物を５秒間浸漬（図１参照）
して引き上げ、紫外線灯照射下において目視にて検査面
を観察したところ、バックグランド現象は殆んど認めら
れず、黄緑色の鮮明な蛍光磁粉模様によって欠陥部が明
確に識別できた。なお、引き続き、連続して同寸・同形
状の自動車用炭素鋼製ナックルアーム 200個について、
上記と同じ操作にて探傷を行ったが、いずれの場合に
も、バックグランド現象は殆んど認められず、欠陥部が
明確に識別できた。EXAMPLES Examples of the present invention will be given below. Example 1 A knuckle arm made of carbon steel for automobiles was used as an inspected object, and the inspected object was magnetized by a residual method according to a conventional method, and the inspection surface thereof had a fluorescent magnetic powder LY-5000 (trade name: manufactured by Marktec Co., Ltd.). ) Was contacted with a magnetic powder liquid in which 0.8 g of the powder was dispersed per liter. On the other hand, prepare a surplus magnetic powder removal device in which a commercially available permanent magnet (SUS-coated neodybron: magnetic flux density of 9000 gauss) is installed on the inner bottom of a cylindrical water tank with a diameter of 50 cm equipped with a paddle type agitator, and water is stored in the water tank. 100 l was charged, the stirrer was rotated, and the running water velocity in the water tank was set to 24 m / min. Immerse the object to be inspected after contact with the magnetic powder for 5 seconds in running water at a running speed of 24 m / min in the water tank (see FIG. 1).
Then, when the inspection surface was visually inspected under irradiation with an ultraviolet lamp, the background phenomenon was hardly observed, and the defect portion was clearly identifiable by the clear fluorescent magnetic powder pattern of yellow-green. In addition, continuously, about 200 carbon steel knuckle arms of the same size and shape for automobiles,
The flaw detection was performed by the same operation as above, but in any case, the background phenomenon was hardly recognized, and the defective portion could be clearly identified.
【００２３】実施例２ 自動車用炭素鋼製リヤーアクスルシャフトを被検査物と
し、当該検査物を、常法に従って、連続法により磁化
し、その検査面に実施例１と同じ磁粉液を接触させた。
一方、深さ35cm、巾35cm、長さ 101cmの長方形箱状水槽
にポンプ循環機構を付設すると共に該循環機構の水路管
の途中（循環ポンプの吸い込み側）に市販の磁気フィル
ター（マグネットフィルターＣＳＣ−１４０：商品名：
株式会社ダルトン製：磁束密度４５００ガウス）を設置
した余剰磁粉除去装置を準備し、当該水槽内の水の容積
が約30×30× 100cmとなる量の水を充填し、循環ポンプ
を回転させて、水槽内の一方向に流れる流水速度を12 m
／min に設定した。上記水槽内の流水速度12 m／min の
流水中に、前記磁粉液に接触後の被検査物を５秒間浸漬
（図２参照）して引き上げ、紫外線灯照射下において目
視にて検査面を観察したところ、バックグランド現象は
殆んど認められず、黄緑色の鮮明な蛍光磁粉模様によっ
て欠陥部が明確に識別できた。なお、引き続き、連続し
て同寸・同形状の自動車用炭素鋼製リヤーアクスルシャ
フト 200個について、上記と同じ操作にて探傷を行った
が、いずれの場合にも、バックグランド現象は殆んど認
められず、欠陥部が明確に識別できた。Example 2 A carbon steel rear axle shaft for automobiles was used as an object to be inspected, and the object to be inspected was magnetized by a continuous method according to a conventional method, and the same magnetic powder liquid as that of Example 1 was brought into contact with the inspection surface. .
On the other hand, a rectangular box-shaped water tank with a depth of 35 cm, a width of 35 cm, and a length of 101 cm is provided with a pump circulation mechanism, and a commercially available magnetic filter (magnet filter CSC-) is installed in the water channel pipe of the circulation mechanism (at the suction side of the circulation pump). 140: Product name:
Dalton Co., Ltd .: Prepare a surplus magnetic powder removal device with a magnetic flux density of 4500 gauss), fill the water tank with an amount of water of about 30 × 30 × 100 cm, and rotate the circulation pump. , The running water velocity flowing in one direction in the water tank is 12 m
Set to / min. Immerse the object to be inspected after contacting the magnetic powder for 5 seconds (see Fig. 2) in running water with a running speed of 12 m / min in the above water tank, and then visually inspect the surface under irradiation with an ultraviolet lamp. As a result, almost no background phenomenon was observed, and the defect portion was clearly identifiable by the clear fluorescent magnetic powder pattern of yellow-green. In addition, continuously, the carbon steel rear axle shafts of the same size and shape for 200 automobiles were inspected by the same operation as above, but in any case, the background phenomenon was almost eliminated. It was not recognized, and the defective part could be clearly identified.
【００２４】実施例３ 自動車用炭素鋼製リヤーアクスルシャフトを被検査物と
し、当該検査物を、常法に従って、連続法により磁化
し、その検査面に実施例１と同じ磁粉液を接触させた。
一方、実施例２で用いた余剰磁粉除去装置に、周知の軸
通電法に使用する磁化機構を付設し、当該水槽内の水の
容積が約30×30× 100cmとなる量の水を充填し、循環ポ
ンプを回転させて、水槽内の一方向に流れる流水速度を
60 m／min に設定した。上記水槽内の流水速度60 m／mi
n の流水中に、前記磁粉液に接触後の被検査物を、その
両端部に上記磁化機構の通電パットを当着して軸通電に
よって磁化した状態で、５秒間浸漬（図３参照）して引
き上げ、通電パットを外した後、紫外線灯照射下におい
て目視にて検査面を観察したところ、バックグランド現
象は認められず、黄緑色の鮮明な蛍光磁粉模様によって
欠陥部が明確に識別できた。なお、引き続き、連続して
同寸・同形状の自動車用炭素鋼製リヤーアクスルシャフ
ト 200個について、上記と同じ操作にて探傷を行った
が、いずれの場合にも、バックグランド現象は認められ
ず、欠陥部が明確に識別できた。Example 3 A carbon steel rear axle shaft for automobiles was used as an object to be inspected, and the object to be inspected was magnetized by a continuous method according to a conventional method, and the same magnetic powder liquid as in Example 1 was contacted with the inspected surface. .
On the other hand, the surplus magnetic powder removing device used in Example 2 was provided with a magnetizing mechanism used for the well-known axial energization method, and the volume of water in the water tank was filled with about 30 × 30 × 100 cm of water. Rotate the circulation pump to adjust the flowing speed of water flowing in one direction in the water tank.
It was set to 60 m / min. Flow velocity in the above tank 60 m / mi
Immerse the object to be inspected after contacting the magnetic powder in n of running water for 5 seconds in a state in which the energizing pads of the magnetizing mechanism are attached to both ends and magnetized by axial energization (see FIG. 3). After pulling up and removing the energizing pad, when visually inspecting the inspection surface under irradiation of an ultraviolet lamp, no background phenomenon was observed, and the defective part could be clearly identified by the clear fluorescent magnetic powder pattern of yellow-green. . In addition, continuously, 200 carbon steel rear axle shafts of the same size and shape for automobile were inspected by the same operation as above, but no background phenomenon was observed in any case. , The defect was clearly identified.
【００２５】[0025]
【発明の効果】以上の通りの構成の本発明によれば、実
施例にも示した通り、被検査物が凹凸部をもつ複雑形状
のものであっても、欠陥部に付着している蛍光磁粉模様
を脱落させることなく、バックグランド現象が充分に解
消できるまで余剰蛍光磁粉を除去できるので、精度の高
い湿式磁粉探傷試験結果を得ることができる。According to the present invention having the above-mentioned structure, as shown in the embodiment, even if the inspection object has a complicated shape having an uneven portion, the fluorescence attached to the defective portion Since the excess fluorescent magnetic powder can be removed until the background phenomenon is sufficiently eliminated without removing the magnetic powder pattern, highly accurate wet magnetic powder flaw detection test results can be obtained.
【００２６】また、本発明においては、余剰蛍光磁粉の
除去に用いた水に存在する蛍光磁粉が収束補捉されるの
で、水の再使用・循環使用が可能となり工業用水の節約
がはかれる。しかも、従来法では、空気の吹き付けや散
水にともなって発生する周囲への余剰蛍光磁粉を含んで
いる水の飛散に対処するため、周辺機器への防水対策が
必要であったが、本発明の実施に当ってはかかる対策は
不要である。従って、本発明の産業利用性は非常に大き
いといえる。Further, in the present invention, since the fluorescent magnetic powder existing in the water used for removing the excess fluorescent magnetic powder is converged and captured, the water can be reused and circulated, and the industrial water can be saved. Moreover, in the conventional method, in order to deal with the scattering of the water containing the surplus fluorescent magnetic powder to the surroundings that occurs along with the blowing of the air or the sprinkling of water, it was necessary to take a waterproofing measure to the peripheral devices. No such measures are necessary for implementation. Therefore, it can be said that the industrial applicability of the present invention is extremely high.
【図１】本発明に係る余剰磁粉除去装置の一態様を模型
的に示した縦断面説明図。FIG. 1 is a vertical cross-sectional explanatory view schematically showing one mode of a surplus magnetic powder removing device according to the present invention.
【図２】本発明に係る余剰磁粉除去装置の他の態様を模
型的に示した縦断面説明図。FIG. 2 is a vertical cross-sectional explanatory view schematically showing another mode of the excess magnetic powder removing device according to the present invention.
【図３】本発明に係る余剰磁粉除去装置の他の態様を模
型的に示した縦断面説明図。FIG. 3 is a vertical cross-sectional explanatory view schematically showing another mode of the excess magnetic powder removing device according to the present invention.
１ 円筒状水槽 11 水 ２ 攪拌機 ３ 磁石 10 長方形箱状水槽 20 ポンプ循環機構
21 水路 30 磁気フィルター 40、40′ 通電パット1 Cylindrical water tank 11 Water 2 Stirrer 3 Magnet 10 Rectangular box water tank 20 Pump circulation mechanism
21 Waterway 30 Magnetic filter 40, 40 'Power pad
フロントページの続き (72)発明者 石渡 康弘 神奈川県横須賀市舟倉町641 マークテッ ク株式会社久里浜工場内 (72)発明者 本山 正躬 神奈川県横須賀市舟倉町641 マークテッ ク株式会社久里浜工場内Front page continued (72) Inventor Yasuhiro Ishiwata 641 Funakura-cho, Yokosuka City, Kanagawa Mark Tech Co., Ltd., Kurihama Plant (72) Inventor, Masami 641 Funakura-cho, Yokosuka City, Kanagawa Mark Tech Co., Ltd., Kurihama Plant
Claims (5)
分散した磁粉液を接触させて欠陥部に生じる漏洩磁束に
より該欠陥部に蛍光磁粉を付着させ、次いで、当該被検
査物を磁石又は磁気フィルターの存在下に流水速度12 m
／min 〜60 m／min の流水中に浸漬して引き上げること
によって欠陥部に付着せずに被検査物表面に残留してい
た余剰蛍光磁粉を除去した後、欠陥部に付着している蛍
光磁粉模様によって欠陥部の存在を探傷することを特徴
とする湿式磁粉探傷試験方法。1. A magnetic powder solution in which fluorescent magnetic powder is dispersed is brought into contact with the surface of a magnetized object to be inspected, and the magnetic flux is attached to the defective portion by a leakage magnetic flux generated in the defective portion, and then the object to be inspected is magnetized. Or 12 m in the presence of a magnetic filter
/ Min to 60 m / min Immersed in running water and pulled up to remove excess fluorescent magnetic powder remaining on the surface of the object to be inspected without adhering to defective parts, and then fluorescent magnetic powder adhered to defective parts A wet magnetic powder flaw detection test method characterized by detecting the presence of a defective portion by a pattern.
12 m／min 〜60 m／min の水流を発生させる攪拌機と該
水槽中に設置された磁石とからなることを特徴とする請
求項１記載の湿式磁粉探傷試験方法に用いる余剰磁粉除
去装置。2. The running speed of the water tank and the water filled in the water tank
The excess magnetic powder removing device used in the wet magnetic powder flaw detection test method according to claim 1, comprising an agitator for generating a water flow of 12 m / min to 60 m / min and a magnet installed in the water tank.
は電磁石のいずれかである請求項２記載の余剰磁粉除去
装置。3. The excess magnetic powder removing device according to claim 2, wherein the magnet installed in the water tank is either a permanent magnet or an electromagnet.
12 m／min 〜60 m／min の水流を発生させるポンプ循環
機構と該ポンプ循環機構の水路中に設置された磁気フィ
ルターとからなることを特徴とする請求項１記載の湿式
磁粉探傷試験方法に用いる余剰磁粉除去装置。4. The water flow rate for the water tank and the water filled in the water tank
The wet magnetic powder flaw detection test method according to claim 1, comprising a pump circulation mechanism for generating a water flow of 12 m / min to 60 m / min, and a magnetic filter installed in a channel of the pump circulation mechanism. Excessive magnetic powder removal device used.
槽中において磁化する磁化機構が付設されている請求項
２又は請求項４記載の余剰磁粉除去装置。5. The surplus magnetic powder removing device according to claim 2, further comprising a magnetizing mechanism for magnetizing an object to be inspected made of a magnetic body to be immersed in a water tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5208999A JPH0743348A (en) | 1993-07-30 | 1993-07-30 | Wet magnetic powder flaw detection testing method and removing device for surplus magnetic powder used for it |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5208999A JPH0743348A (en) | 1993-07-30 | 1993-07-30 | Wet magnetic powder flaw detection testing method and removing device for surplus magnetic powder used for it |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0743348A true JPH0743348A (en) | 1995-02-14 |
Family
ID=16565636
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5208999A Pending JPH0743348A (en) | 1993-07-30 | 1993-07-30 | Wet magnetic powder flaw detection testing method and removing device for surplus magnetic powder used for it |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0743348A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002357561A (en) * | 2001-06-01 | 2002-12-13 | Toshiba Corp | Fluorescence removal method and fluorescence removal device in fluorescence inspection |
| JP2003050231A (en) * | 2001-08-06 | 2003-02-21 | Showa Corp | Pipe magnetic particle inspection equipment |
| CN105527340A (en) * | 2016-01-19 | 2016-04-27 | 云南电力试验研究院(集团)有限公司 | Portable automatic water magnetic suspension preparation machine |
| CN114062482A (en) * | 2021-12-22 | 2022-02-18 | 重庆歇马机械曲轴有限公司 | Rotating disc type crank magnetic powder flaw detection tool |
| CN117030838A (en) * | 2023-08-18 | 2023-11-10 | 苏州振畅智能科技有限公司 | Rail surface defect detection device |
| CN117469476A (en) * | 2023-12-28 | 2024-01-30 | 临汾淼森能源工程有限公司 | Fixing support for heating pipeline |
| CN117517332A (en) * | 2024-01-08 | 2024-02-06 | 石家庄铁道大学 | A non-destructive flaw detection device for vehicle parts |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002357561A (en) * | 2001-06-01 | 2002-12-13 | Toshiba Corp | Fluorescence removal method and fluorescence removal device in fluorescence inspection |
| JP2003050231A (en) * | 2001-08-06 | 2003-02-21 | Showa Corp | Pipe magnetic particle inspection equipment |
| CN105527340A (en) * | 2016-01-19 | 2016-04-27 | 云南电力试验研究院(集团)有限公司 | Portable automatic water magnetic suspension preparation machine |
| CN114062482A (en) * | 2021-12-22 | 2022-02-18 | 重庆歇马机械曲轴有限公司 | Rotating disc type crank magnetic powder flaw detection tool |
| CN117030838A (en) * | 2023-08-18 | 2023-11-10 | 苏州振畅智能科技有限公司 | Rail surface defect detection device |
| CN117030838B (en) * | 2023-08-18 | 2024-02-09 | 苏州振畅智能科技有限公司 | Rail surface defect detection device |
| CN117469476A (en) * | 2023-12-28 | 2024-01-30 | 临汾淼森能源工程有限公司 | Fixing support for heating pipeline |
| CN117469476B (en) * | 2023-12-28 | 2024-04-02 | 临汾淼森能源工程有限公司 | Fixing support for heating pipeline |
| CN117517332A (en) * | 2024-01-08 | 2024-02-06 | 石家庄铁道大学 | A non-destructive flaw detection device for vehicle parts |
| CN117517332B (en) * | 2024-01-08 | 2024-03-22 | 石家庄铁道大学 | A non-destructive testing device for vehicle parts |
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