JP6933973B2 - Magnetic particle spraying device for magnetic particle flaw detection and magnetic particle liquid spraying method for magnetic particle flaw detection - Google Patents

Magnetic particle spraying device for magnetic particle flaw detection and magnetic particle liquid spraying method for magnetic particle flaw detection Download PDF

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JP6933973B2
JP6933973B2 JP2017244551A JP2017244551A JP6933973B2 JP 6933973 B2 JP6933973 B2 JP 6933973B2 JP 2017244551 A JP2017244551 A JP 2017244551A JP 2017244551 A JP2017244551 A JP 2017244551A JP 6933973 B2 JP6933973 B2 JP 6933973B2
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松本　謙二
謙二 松本
俊 伊東
俊 伊東
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Marktec Corp
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Description

本発明は、磁粉探傷用磁粉液散布装置、及び磁粉探傷用磁粉液散布方法に関し、より詳細には、磁粉を用いて探傷を行う磁粉探傷試験における磁粉探傷用磁粉液散布装置、及び磁粉探傷用磁粉液散布方法に関する。 The present invention relates to a magnetic particle liquid spraying device for magnetic particle flaw detection and a magnetic particle liquid spraying method for magnetic particle flaw detection. Regarding the method of spraying magnetic powder liquid.

磁粉探傷試験は、例えばビレット等の鋼材や自動車のシャフト等の被検査物の表面の探傷検査に適用され、ＪＩＳ−Ｚ−２３２０に規格化されている。磁粉探傷試験では、被検査物の表面に磁粉を含有する磁粉溶液、すなわち磁粉液を塗布するとともに、被検査物に磁場を印加する等して被検査物を磁化する。磁化された被検査物の表面にクラック等の傷がある場合には、この傷から磁束が漏洩するため、この漏洩磁束による磁粉指示模様が形成される。そして、この磁粉指示模様を観測することで傷を検査する。磁粉探傷試験には、傷の検出精度を向上させるために、磁粉に蛍光体を塗布した蛍光磁粉を用いる蛍光磁粉探傷試験も知られている。 The magnetic particle flaw detection test is applied to a flaw detection inspection of the surface of a steel material such as a billet or an object to be inspected such as an automobile shaft, and is standardized in JIS-Z-2320. In the magnetic particle inspection test, a magnetic powder solution containing magnetic powder, that is, a magnetic powder liquid is applied to the surface of the object to be inspected, and a magnetic field is applied to the object to be inspected to magnetize the object to be inspected. When there are scratches such as cracks on the surface of the magnetized object to be inspected, magnetic flux leaks from the scratches, so that a magnetic powder instruction pattern is formed by the leaked magnetic flux. Then, the scratch is inspected by observing this magnetic particle instruction pattern. As a magnetic particle flaw detection test, a fluorescent magnetic particle flaw detection test using a fluorescent magnetic powder obtained by coating a magnetic powder with a phosphor is also known in order to improve the scratch detection accuracy.

磁粉探傷試験において磁粉液を散布する方法として、従来スプレーノズルで磁粉液を散布する方法が知られているが、これにより散布をしても均一な散布ができず、磁粉液の散布量や流速が被検査物の部位によって大きく異なることとなっていた。従って、傷の検出力が大きくばらついて、浅い傷の見逃しが発生していた。 As a method of spraying the magnetic powder liquid in the magnetic particle inspection test, a method of spraying the magnetic powder liquid with a spray nozzle has been conventionally known, but even if it is sprayed by this method, uniform spraying cannot be performed, and the amount and flow velocity of the magnetic powder liquid sprayed. However, it was supposed to differ greatly depending on the part of the object to be inspected. Therefore, the power of detecting scratches varies greatly, and shallow scratches are overlooked.

磁粉液散布を浸漬法で行えば傷の検出力は安定するものの、工程が増加するためサイクルタイムが長くなり、生産量が低下する問題が発生していた。このため、検査に要する時間を短縮しつつ、傷の検出力を安定させるため、種々の提案がなされているところである。 Although the power to detect scratches is stable when the magnetic powder liquid is sprayed by the dipping method, there is a problem that the cycle time becomes long due to the increase in the number of steps and the production amount decreases. Therefore, various proposals have been made in order to stabilize the power of detecting scratches while shortening the time required for inspection.

特許文献１には、厚さ方向に貫通する孔が形成された磁性体からなる被検査材の孔に電流貫通極を挿入し該電流貫通極に直流電流を通電すると共に、被検査材の両側面に対向して配置された磁化コイルに交流電流を通電して前記被検査材を磁化する工程と、前記被検査材の表面に磁粉液を散布する工程と、前記被検査材に付着する磁粉の有無を観察する工程と、前記被検査材を脱磁する工程と、からなる磁粉探傷方法が開示されている。 In Patent Document 1, a current penetrating electrode is inserted into a hole of a magnetic material in which a hole penetrating in the thickness direction is formed, a DC current is applied to the current penetrating electrode, and both sides of the material to be inspected are energized. A step of energizing an alternating current through a magnetizing coil arranged to face the surface to magnetize the material to be inspected, a step of spraying a magnetic powder liquid on the surface of the material to be inspected, and a step of spraying a magnetic powder liquid on the material to be inspected. A magnetic particle flaw detection method comprising a step of observing the presence or absence of an electric current and a step of demagnetizing the material to be inspected is disclosed.

特開２００３−３４４３５９号公報Japanese Unexamined Patent Publication No. 2003-344359

特許文献１には、磁粉液を少ないノズルでしかも短時間で均一に散布するために、被検査材を孔を軸心として回転させながら、上方から磁粉液を散布することが開示されている。ここで、被検査物の表面のクラック等の傷部から漏洩する漏洩磁束は、とても弱く、傷部の上を通過する磁粉を引き止めることはできるものの、傷部から離れた部位を通過する磁粉を引き止めることはできない。また、被検査物の表面を流れる磁粉液の流れが速いと磁粉が漏洩磁束に引き止められずに流されてしまい、磁粉指示模様が形成されない。一方で、被検査物の表面を流れる磁粉液の流れが遅いと磁粉指示模様が形成されるまでに多くの時間を要する。したがって、傷部の検出確度や作業効率を向上させるためには、被検査物の表面を流れる磁粉液の流れを適正な流れにすることが重要である。 Patent Document 1 discloses that the magnetic powder liquid is sprayed from above while rotating the material to be inspected about the hole as an axis in order to uniformly spray the magnetic powder liquid with a small number of nozzles in a short time. Here, the magnetic flux leaked from the scratched part such as a crack on the surface of the object to be inspected is very weak, and although the magnetic powder passing over the scratched part can be stopped, the magnetic powder passing through the part away from the scratched part is removed. I can't stop it. Further, if the magnetic powder liquid flowing on the surface of the object to be inspected is fast, the magnetic powder is flown without being stopped by the leakage magnetic flux, and the magnetic powder instruction pattern is not formed. On the other hand, if the flow of the magnetic powder liquid flowing on the surface of the object to be inspected is slow, it takes a lot of time until the magnetic powder instruction pattern is formed. Therefore, in order to improve the detection accuracy and work efficiency of the scratched portion, it is important to make the flow of the magnetic powder liquid flowing on the surface of the object to be inspected an appropriate flow.

特許文献１の磁粉探傷方法では、磁粉液を短時間で均一に散布することは考慮されているものの、被検査体の表面を流れる磁粉液の流速については何ら考慮がなされていない。 よって、流速が早いと検出精度が低くなる問題は残っている。もちろん流速が遅いと検査速度が遅くなる。 In the magnetic particle flaw detection method of Patent Document 1, although it is considered that the magnetic powder liquid is uniformly sprayed in a short time, no consideration is given to the flow velocity of the magnetic powder liquid flowing on the surface of the object to be inspected. Therefore, there remains a problem that the detection accuracy becomes low when the flow velocity is high. Of course, if the flow velocity is slow, the inspection speed will be slow.

更に、特許文献１の磁粉探傷方法では、被検査物は厚さ方向に貫通する孔が形成されたものに限定されるため、汎用性が低い。更に、従来技術としての浸漬法によれば流速を考慮せずに検査精度を高めることができるが、磁粉液に検査物を浸すのは工程上手間がかかるため、検査速度としては遅くなる。 Further, in the magnetic particle inspection method of Patent Document 1, the object to be inspected is limited to the one in which holes penetrating in the thickness direction are formed, so that the versatility is low. Further, according to the dipping method as a conventional technique, the inspection accuracy can be improved without considering the flow velocity, but the inspection speed is slowed down because it takes time and effort in the process to immerse the inspection object in the magnetic powder liquid.

そこで、本発明の目的は、検査に要する時間を短縮しつつ、傷部の検出確度が高い磁粉探傷用磁粉液散布装置、及び磁粉探傷用磁粉液散布方法を提供することにある。 Therefore, an object of the present invention is to provide a magnetic particle liquid spraying device for magnetic particle flaw detection and a magnetic particle liquid spraying method for magnetic particle flaw detection, while shortening the time required for inspection and having high detection accuracy of scratches.

上記課題を解決するために、本発明は、被検査物を搬送する搬送部と、カバー部、散布ノズル部、磁粉液供給部を備える磁粉探傷用磁粉液散布装置であって、前記搬送部は搬送用台座を備え、該搬送用台座は複数の支持部と、穴部を備え、前記搬送部の下方に前記散布ノズル部が備えられ、前記カバー部は中空状で二つ以上に分離可能であり、前記カバー部は外側面部、内側面部、天面部、底面部を有し、前記天面部は上孔を有し、前記内側面部は上孔と連通した空間を有し、前記底面部は、前記空間に連通した下孔を有し、前記内側面部は、前記被検査物と接触しないことが可能な形、大きさの前記空間を備えることを特徴とする。 In order to solve the above problems, the present invention is a magnetic particle liquid spraying device for magnetic particle inspection, which includes a transport unit for transporting an object to be inspected, a cover portion, a spray nozzle portion, and a magnetic powder liquid supply unit. The transport pedestal is provided, the transport pedestal is provided with a plurality of support portions and holes, the spray nozzle portion is provided below the transport portion, and the cover portion is hollow and can be separated into two or more. The cover portion has an outer surface portion, an inner side surface portion, a top surface portion, and a bottom surface portion, the top surface portion has an upper hole, the inner side surface portion has a space communicating with the upper hole, and the bottom surface portion has a space. It is characterized by having a prepared hole communicating with the space, and the inner side surface portion is provided with the space having a shape and a size capable of not coming into contact with the object to be inspected.

更に、前記空間と前記被検査物の形状は、大きさが異なる略同一形状であって、前記内側面部の内側面下部と前記被検査物の間隔は、５ミリメートル以上３０ミリメートル以下であることが可能なように、前記内側面部が形成されていることを特徴とする。 Further, the space and the shape of the object to be inspected are substantially the same shape having different sizes, and the distance between the lower part of the inner surface of the inner side surface portion and the object to be inspected is 5 mm or more and 30 mm or less. It is characterized in that the inner side surface portion is formed so as to be possible.

更に、前記支持部はカバーに干渉しないことが可能であって、前記披検査物との接触面積が小さい形状であり、前記搬送用台座に対し着脱可能であることを特徴とする。 Further, the support portion can not interfere with the cover, has a shape having a small contact area with the inspection object, and is removable from the transport pedestal.

更に、前記カバー部の前記外側面部に、前記空間に連通する中穴部を１または複数設け、該中穴部近傍にそれぞれ側部散布ノズルを設けたことを特徴とする。 Further, the outer surface portion of the cover portion is provided with one or a plurality of intermediate hole portions communicating with the space, and side spray nozzles are provided in the vicinity of the intermediate hole portions.

更に、前記上孔の近傍に上部散布ノズルを設けることを特徴とする。 Further, an upper spray nozzle is provided in the vicinity of the upper hole.

更に前記磁粉液供給部は配管と、前記搬送部、前記散布ノズルのそれぞれよりも上方に位置するタンクを有することを特徴とする。 Further, the magnetic powder liquid supply unit is characterized by having a pipe, a tank located above each of the transport unit and the spray nozzle.

また、本発明の磁粉探傷用磁粉液散布方法は、被検査物を搬送用台座に載置し、所定位置まで搬送した後、前記被検査物の表層部を磁化するとともに磁粉液を散布し、傷部に磁粉指示模様を形成し、傷部の検出を行う磁粉探傷方法における磁粉探傷用磁粉液散布方法において、前記所定位置において、前記被検査物を覆うことのできる筒状の１つのカバー部となる複数のカバー片を接合することにより、前記被検査物を、前記搬送用台座とともに覆い、前記所定位置における前記被検査物の下方から散布ノズルにより磁粉液を散布し、前記カバー部の内部を、磁粉液で、少なくとも被検査物より上の水位となるまで満たすことを特徴とする。 Further, in the method of spraying magnetic particle liquid for magnetic particle inspection of the present invention, the object to be inspected is placed on a transport pedestal, transported to a predetermined position, and then the surface layer portion of the object to be inspected is magnetized and the magnetic powder liquid is sprayed. In the magnetic particle liquid spraying method for magnetic particle inspection in the magnetic particle flaw detection method in which a magnetic powder instruction pattern is formed on the scratched portion and the scratched portion is detected, one tubular cover portion capable of covering the object to be inspected at the predetermined position. By joining a plurality of cover pieces to be inspected, the object to be inspected is covered together with the transport pedestal, and the magnetic powder liquid is sprayed from below the object to be inspected at the predetermined position by a spray nozzle, and the inside of the cover portion. Is filled with a magnetic powder solution until the water level is at least above the object to be inspected.

本発明によれば、被検査物を搬送する搬送部と、カバー部、散布ノズル部、磁粉液供給部を備える磁粉探傷用磁粉液散布装置であって、前記搬送部は搬送用台座を備え、該搬送用台座は複数の支持部と、穴部を備え、前記搬送部の下方に前記散布ノズル部が備えられ、前記カバー部は中空状で二つ以上に分離可能であり、前記カバー部は外側面部、内側面部、天面部、底面部を有し、前記天面部は上孔を有し、前記内側面部は上孔と連通した空間を有し、前記底面部は、前記空間に連通した下孔を有し、前記内側面部は、前記被検査物と接触しないことが可能な形、大きさの前記空間を備えることを特徴とするので、深さが浅い傷が安定して検出でき、かつ検査の速度も速い、磁粉探傷用磁粉液散布装置を提供することができる。 According to the present invention, it is a magnetic particle liquid spraying device for magnetic particle inspection including a transport unit for transporting an object to be inspected, a cover portion, a spray nozzle portion, and a magnetic powder liquid supply unit, and the transport unit includes a transport pedestal. The transport pedestal is provided with a plurality of support portions and holes, the spray nozzle portion is provided below the transport portion, the cover portion is hollow and can be separated into two or more, and the cover portion is It has an outer side surface portion, an inner side surface portion, a top surface portion, and a bottom surface portion, the top surface portion has an upper hole, the inner side surface portion has a space communicating with the upper hole, and the bottom surface portion communicates with the space. Since the inner side surface portion has a hole and is provided with the space having a shape and a size that can prevent contact with the object to be inspected, shallow scratches can be stably detected and can be detected. It is possible to provide a magnetic powder liquid spraying device for magnetic particle inspection, which has a high inspection speed.

更に、本発明によれば、前記空間と前記被検査物の形状は、大きさが異なる略同一形状であって、前記内側面部の内側面下部と前記被検査物の間隔は、５ミリメートル以上３０ミリメートル以下であることが可能なように、前記内側面部が形成されていることを特徴とするので、傷部の検出精度を保ちつつ、散布ノズル部からの磁粉液の供給を、より少ない仕事量で可能にする磁粉探傷装置を提供することができる。 Further, according to the present invention, the space and the shape of the object to be inspected are substantially the same shape having different sizes, and the distance between the lower part of the inner surface of the inner side surface portion and the object to be inspected is 5 mm or more and 30. Since the inner side surface portion is formed so that it can be less than a millimeter, the amount of work required to supply the magnetic powder liquid from the spray nozzle portion is smaller while maintaining the detection accuracy of the scratched portion. It is possible to provide a magnetic particle flaw detector that enables the above.

更に前記支持部はカバーに干渉しないことが可能であって、前記披検査物との接触面積が小さい形状であり、前記搬送用台座に対し着脱可能であることを特徴とするので、台座を変えることなく様々形状の被検査物に対応できる、磁粉探傷用磁粉液散布装置を提供することができる。 Further, the support portion can not interfere with the cover, has a shape having a small contact area with the inspection object, and is removable from the transport pedestal. Therefore, the pedestal is changed. It is possible to provide a magnetic powder liquid spraying device for magnetic particle flaw detection, which can deal with various shapes of objects to be inspected without any problem.

更に、前記カバー部の前記外側面部に、前記空間に連通する中穴部を１または複数設け、該中穴部近傍にそれぞれ側部散布ノズルを設けたことを特徴とするので、傷部の検出確度が高く保たれたまま、より急速に磁粉液を供給することができ、従って検査速度の速い磁粉探傷方法を提供することができる。 Further, the outer surface portion of the cover portion is provided with one or a plurality of intermediate hole portions communicating with the space, and side spray nozzles are provided in the vicinity of the intermediate hole portions, so that the scratched portion can be detected. It is possible to supply the magnetic powder liquid more rapidly while maintaining high accuracy, and therefore it is possible to provide a magnetic particle flaw detection method having a high inspection speed.

更に、前記上孔の近傍に上部散布ノズルを設けることを特徴とするので、傷部の検出確度が高く、より少ない仕事量で急速に磁粉液を供給することができ、従って検査速度の速い効率的な磁粉探傷方法を提供することができる。 Further, since the upper spray nozzle is provided in the vicinity of the upper hole, the detection accuracy of the scratched portion is high, and the magnetic powder liquid can be rapidly supplied with a smaller amount of work, and therefore the inspection speed is high and efficient. A magnetic particle flaw detection method can be provided.

更に、前記磁粉液供給部は配管と、前記搬送部、前記散布ノズルのそれぞれよりも上方に位置するタンクを有することを特徴とするので、小さなポンプでも瞬間供給量が多いため、より効率的な磁粉探傷用磁粉液散布装置を提供することができる。 Further, since the magnetic particle liquid supply unit has a pipe and a tank located above each of the transport unit and the spray nozzle, even a small pump has a large instantaneous supply amount, which is more efficient. A magnetic powder liquid spraying device for magnetic particle flaw detection can be provided.

更に、本発明の磁粉探傷用磁粉液散布方法によれば、被検査物を搬送用台座に載置し、所定位置まで搬送した後、前記被検査物の表層部を磁化するとともに磁粉液を散布し、傷部に磁粉指示模様を形成し、傷部の検出を行う磁粉探傷方法における磁粉探傷用磁粉液散布方法において、前記所定位置において、前記被検査物を覆うことのできる筒状の１つのカバー部となる複数のカバー片を接合することにより、前記被検査物を、前記搬送用台座とともに覆い、前記所定位置における前記被検査物の下方から散布ノズルにより磁粉液を散布し、前記カバー部の内部を、磁粉液で、少なくとも被検査物より上の水位となるまで満たすことを特徴とするので、被検査物に対し、被検査物の表面の磁粉液の流速を抑えた効率的な磁粉液の散布をすることができ、傷部の検出確度が高く効率のよい磁粉探傷用磁粉液散布方法を提供することができる。 Further, according to the method of spraying magnetic particle liquid for magnetic particle inspection of the present invention, the object to be inspected is placed on a transport pedestal, transported to a predetermined position, and then the surface layer portion of the object to be inspected is magnetized and the magnetic powder liquid is sprayed. In the magnetic particle liquid spraying method for magnetic particle inspection in the magnetic particle flaw detection method in which a magnetic particle instruction pattern is formed on the scratched portion and the scratched portion is detected, one of the tubular shapes capable of covering the object to be inspected at the predetermined position. By joining a plurality of cover pieces to be the cover portion, the object to be inspected is covered together with the transport pedestal, and the magnetic powder liquid is sprayed from below the object to be inspected at the predetermined position by the spray nozzle, and the cover portion. Since the inside of the particle is filled with a magnetic particle solution until the water level is at least above the object to be inspected, an efficient magnetic particle that suppresses the flow velocity of the magnetic particle solution on the surface of the object to be inspected with respect to the object to be inspected. It is possible to spray the liquid, and it is possible to provide an efficient magnetic particle liquid spraying method for magnetic particle inspection with high detection accuracy of scratches.

本実施形態に係る磁粉探傷用磁粉液散布装置のカバー部の一例が示された図である。It is a figure which showed an example of the cover part of the magnetic particle liquid spraying apparatus for magnetic particle inspection which concerns on this embodiment. 図１のカバー部の底面図である。It is a bottom view of the cover part of FIG. 本実施形態に係る磁粉探傷用磁粉液散布装置の搬送用台座の一例が示された図である。It is a figure which showed an example of the transport pedestal of the magnetic particle liquid spraying apparatus for magnetic particle inspection which concerns on this embodiment. 本実施形態に係る磁粉探傷用磁粉液散布装置の一例が示された図である。It is a figure which showed an example of the magnetic powder liquid spraying apparatus for magnetic particle flaw detection which concerns on this embodiment. （ａ）は、図４のZ−Z線断面図であり、（ｂ）は図５（ａ）の一部分を抜き出した図である。FIG. 4A is a cross-sectional view taken along the line ZZ of FIG. 4, and FIG. 4B is a diagram obtained by extracting a part of FIG. 5A. 図４のW-W線断面図の斜視図である。It is a perspective view of the cross-sectional view taken along the line W-W of FIG. 本実施形態に係る磁粉探傷用磁粉液散布装置の被検査物の搬送時を示した図である。It is a figure which showed the time of transporting the object to be inspected of the magnetic particle liquid spraying apparatus for magnetic particle inspection which concerns on this embodiment. 図７を上方向からみた図である。FIG. 7 is a view from above. 本実施形態に係る磁粉探傷用磁粉液散布装置の被検査物が所定位置に到着した段階の図である。It is a figure at the stage when the object to be inspected of the magnetic particle liquid spraying apparatus for magnetic particle inspection which concerns on this embodiment arrives at a predetermined position. 本実施形態に係る磁粉探傷用磁粉液散布装置の被検査物を所定位置でカバー部が覆っている段階の図である。It is a figure of the stage where the cover part covers the object to be inspected of the magnetic particle liquid spraying apparatus for magnetic particle inspection which concerns on this embodiment at a predetermined position. 図１０を側面から見た側面図である。FIG. 10 is a side view of FIG. 10 as viewed from the side. 図１のカバー部の斜視図である。It is a perspective view of the cover part of FIG. 本実施形態における磁粉探傷用磁粉液散布装置の搬送用台座の支持部の他の例を示した図である。It is a figure which showed other example of the support part of the transport pedestal of the magnetic particle liquid spraying apparatus for magnetic particle inspection in this embodiment.

以下、図面を参照しつつ、本発明の実施形態を詳細に説明する。図１（ａ）（ｂ）は本実施形態に係る磁粉探傷用磁粉液散布装置１のカバー部１２の一例が示された正面図及び上面図であり、図２は図１の磁粉探傷用磁粉液散布装置１のカバー部１２の概略底面図であり、図３は本実施形態に係る磁粉探傷用磁粉液散布装置１の搬送用台座２０の一例が示された概略上面図と概略側面図である。図４は、磁粉探傷用磁粉液散布装置１の斜視図であり、図５は、そのＺ−Ｚ線断面図である。なお、以下では、説明の便宜上、図５において、後述する天面部３３の側を上とし、後述する散布ノズル部１３の側を下とし、紙面に対して手前側を横とし、右側を前、左側を後ろとする。また、図４において、散布ノズル部１３の記載は省略されている。 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1A and 1B are a front view and a top view showing an example of a cover portion 12 of the magnetic particle liquid spraying device 1 for magnetic particle inspection according to the present embodiment, and FIG. 2 is a top view showing the magnetic particle for magnetic particle inspection of FIG. It is a schematic bottom view of the cover part 12 of the liquid spraying device 1, and FIG. 3 is a schematic top view and a schematic side view showing an example of a transport pedestal 20 of the magnetic particle liquid spraying device 1 for magnetic particle inspection according to the present embodiment. be. FIG. 4 is a perspective view of the magnetic particle liquid spraying device 1 for magnetic particle inspection, and FIG. 5 is a cross-sectional view taken along the line ZZ. In the following, for convenience of explanation, in FIG. 5, the side of the top surface portion 33 described later is on the top, the side of the spray nozzle portion 13 described later is on the bottom, the front side is sideways with respect to the paper surface, and the right side is the front. The left side is the back. Further, in FIG. 4, the description of the spray nozzle portion 13 is omitted.

図５、図６に示されるように、磁粉探傷用磁粉液散布装置１は、被検査物の全体を、カバー部１２と搬送用台座２０で覆っている。また、図１に示すように、カバー部１２は、カバー片１２Ａとカバー片１２Ｂに分離可能となっている。図５に示すように、搬送用台座２０は、支持部２１を４つ備え、支持部２１により被検査物１０が、カバー部にも、支持部２１以外の搬送用台座にも接せず、カバー部１２との関係では宙に浮いた状態で載置することができるようになっている。ただ、支持部２１は被検査物を支えるのに支障がない形であって、かつ後述するような磁粉液の通る隙間が十分に存する形状であれば、数や形状は特に限定されるものではない。 As shown in FIGS. 5 and 6, the magnetic particle liquid spraying device 1 for magnetic particle inspection covers the entire object to be inspected with a cover portion 12 and a transport pedestal 20. Further, as shown in FIG. 1, the cover portion 12 can be separated into a cover piece 12A and a cover piece 12B. As shown in FIG. 5, the transport pedestal 20 includes four support portions 21, and the support portion 21 prevents the object 10 to be inspected from coming into contact with the cover portion or the transport pedestal other than the support portion 21. In relation to the cover portion 12, it can be placed while floating in the air. However, the number and shape of the support portion 21 are not particularly limited as long as the support portion 21 has a shape that does not hinder the support of the object to be inspected and has a shape in which a gap through which the magnetic powder liquid passes, which will be described later, is sufficiently present. No.

ただ、披検査物との接触面積が小さい形状であることが好適であり、さらに言えば被検査物との接触面が球形であれば好適である。搬送用台座の下側には、散布ノズル部１３が備えられている。散布ノズル部１３から上方向に磁粉液が散布される。散布ノズル部１３は磁粉液供給部と、配管で連なっている。磁粉液供給部は、図示せぬタンクや、磁粉液を回収、循環させる貯水槽、ポンプなどからなっている。被検査物は本実施形態においては鍛造部品であるが、これに限定されるものではなく、例えば、広く鋼材や自動車のシャフト等に用いてよい。 However, it is preferable that the shape has a small contact area with the object to be inspected, and further, it is preferable that the contact surface with the object to be inspected is spherical. A spray nozzle portion 13 is provided on the lower side of the transport pedestal. The magnetic powder liquid is sprayed upward from the spray nozzle portion 13. The spray nozzle portion 13 is connected to the magnetic powder liquid supply portion by a pipe. The magnetic powder liquid supply unit includes a tank (not shown), a water storage tank for collecting and circulating the magnetic powder liquid, a pump, and the like. The object to be inspected is a forged part in the present embodiment, but is not limited to this, and may be widely used, for example, for steel materials, automobile shafts, and the like.

搬送用台座２０は、図５、６、７等に示されるように、搬送用のチェインレール２３に固定され、チェインレール２３とともに被検査物１０を搬送する搬送部１１を構成している。 As shown in FIGS. 5, 6, 7 and the like, the transport pedestal 20 is fixed to the transport chain rail 23, and constitutes a transport unit 11 that transports the object to be inspected 10 together with the chain rail 23.

以下図１、図５を参照しカバー部１２をさらに詳述する。カバー部１２の形状は、被検査物１０によって異なるものの、構成として、被検査物１０が載置された場合に、カバー片１２Ａ、１２Ｂで、被検査物１０に接触せずに覆うことが可能な大きさ、形状であるとよい。より好ましくは、被検査物１０よりも大きく、かつ被検査物と略同一形状であることが好ましい。このように構成することで、カバー部１２と被検査物１０と一定の間隔Ｌを保つことができ、一部の箇所で被検査物１０とカバー部１２の隙間が狭くなったりすることを防ぐことができる。従って、カバー部１２の内部を磁粉液で満たす場合に、摩擦圧力損失等を考慮しないで、より少ない圧力で磁粉液を満たすことができる。 The cover portion 12 will be described in more detail below with reference to FIGS. 1 and 5. Although the shape of the cover portion 12 differs depending on the object to be inspected 10, when the object to be inspected 10 is placed, the cover pieces 12A and 12B can cover the cover portion 12 without contacting the object to be inspected 10. The size and shape should be large. More preferably, it is larger than the object to be inspected 10 and has substantially the same shape as the object to be inspected. With this configuration, a constant distance L can be maintained between the cover portion 12 and the object to be inspected 10, and it is possible to prevent the gap between the inspected object 10 and the cover portion 12 from becoming narrow in some places. be able to. Therefore, when the inside of the cover portion 12 is filled with the magnetic powder liquid, the magnetic powder liquid can be filled with a smaller pressure without considering the frictional pressure loss and the like.

カバーの材質については被検査物の探傷結果に影響を与えないよう非磁性体を用いる。 As for the material of the cover, a non-magnetic material is used so as not to affect the flaw detection result of the object to be inspected.

また、カバーは天面部３３に上孔４１を備え、底面部３４に下孔４３を備える。搬送用台座２０の上にカバー部１２がくる構成となる本発明の実施形態の場合、カバー部１２に下孔４３を備えることで、搬送用台座２０に備えられた穴部２２と、カバー部１２の空間４２が下孔を通じて連通することとなる。このように構成することで、搬送用台座２０の下側に備えられた散布ノズル部１３から、カバー部１２の内部の空間４２に収められている被検査物１０に向かって、カバー部１２の内部の空間４２を磁粉液で満たすことで、磁粉液を被検査物１０の表面にまんべんなく浸漬することが可能となる。 Further, the cover is provided with an upper hole 41 on the top surface portion 33 and a lower hole 43 on the bottom surface portion 34. In the case of the embodiment of the present invention in which the cover portion 12 is placed on the transport pedestal 20, the cover portion 12 is provided with the pilot hole 43 so that the hole portion 22 provided in the transport pedestal 20 and the cover portion are provided. The 12 spaces 42 communicate with each other through the pilot holes. With this configuration, the cover portion 12 is directed from the spray nozzle portion 13 provided on the lower side of the transport pedestal 20 toward the inspected object 10 housed in the space 42 inside the cover portion 12. By filling the internal space 42 with the magnetic powder liquid, the magnetic powder liquid can be evenly immersed in the surface of the object 10 to be inspected.

カバー部１２をさらに詳述する。図５に示される、被検査物１０をカバー部１２が覆っている状態の場合に、被検査物１０と、内側面下部４４の間隔Ｌが、５ミリメートルから３０ミリメートル程度、より好ましくは２０ミリメートルであると、磁粉液を満たす場合の、カバー内部の圧力損失等を考慮すると、好適である。 The cover portion 12 will be described in more detail. When the cover portion 12 covers the object to be inspected 10 as shown in FIG. 5, the distance L between the object to be inspected 10 and the lower inner side surface 44 is about 5 mm to 30 mm, more preferably 20 mm. This is preferable in consideration of the pressure loss inside the cover when filling the magnetic powder liquid.

ここで、カバー部１２の内側面全体のうち、被検査物１０を支持部２１の上に載置し、カバー部１２を接合した図５、図６に示される状態において、カバー部２２の内側面全体のうち、被検査物１０の高さより下方のカバー部１２の内側面を、内側面下部４４とする。 Here, of the entire inner side surface of the cover portion 12, the inside of the cover portion 22 is in the state shown in FIGS. 5 and 6 in which the object to be inspected 10 is placed on the support portion 21 and the cover portion 12 is joined. Of the entire side surface, the inner side surface of the cover portion 12 below the height of the object to be inspected 10 is referred to as the inner side surface lower portion 44.

ここで、説明の便宜上、被検査物１０の高さとは、被検査物１０の鉛直方向で一番高い部分であり、図５（ａ）の被検査物１０でいえば破線Ｘに接する部分を指している。ただし、被検査物１０の形は様々であることはいうまでもない。被検査物１０の高さより下方とは、図５（ａ）でいえば、破線Ｘより矢印Z方向の部分のことを言うこととする。 Here, for convenience of explanation, the height of the object to be inspected 10 is the highest portion of the object to be inspected 10 in the vertical direction, and the portion of the object to be inspected 10 in FIG. pointing. However, it goes without saying that the shape of the object to be inspected 10 varies. Below the height of the object to be inspected 10, in FIG. 5A, it means the portion in the direction of the arrow Z from the broken line X.

内側面上部４６は、被検査物１０を支持部２１の上に載置した場合に、被検査物の鉛直方向で一番高い高さ、つまり図５でいえば破線Ｘの高さであるが、この高さより上の部分を指す。内側面上部４６の形は特に限定するものではなく、上孔４１が形成されていればよい。図５（ｂ）は図５（ａ）からカバー部１２だけを抜き出して図示したもので、内側面上部４６が斜線で示されている。 The upper portion 46 of the inner surface is the highest height in the vertical direction of the object to be inspected when the object to be inspected 10 is placed on the support portion 21, that is, the height of the broken line X in FIG. , Refers to the part above this height. The shape of the inner surface upper portion 46 is not particularly limited, and it is sufficient that the upper hole 41 is formed. FIG. 5 (b) shows only the cover portion 12 extracted from FIG. 5 (a), and the upper portion 46 of the inner side surface is shown by diagonal lines.

また、カバー部１２の天面部３３には、上孔４１が設けられている。上孔４１は下孔４３から散布される磁粉液に押しやられた空気の逃げ道として、必要である。空気は磁粉液を下孔４３から散布することにより満たすと、上に逃げるように流れる。上孔４１は、天面部３３に設けられていることは必ずしも必要ではなく、例えば本実施形態の、カバー部１２の天面部３３付近の外側面部３１や、内側面上部４６は円筒状であり、円筒状部分が上方に突出し、かつその天面部３３はふさがれているが、例えばカバー部１２の天面部３３付近の円筒状部分は網状であって、外部の空間と内部の空間４２とがつながっている構成とすることでも、同じ効果が得られる。そこで、天面部３３、もしくはその近傍に、上孔４１があればよいし、上孔４１は全くの空洞でなくとも、空気の逃げ道として支障がなければ網状その他公知の構成により覆われていてもよい。 Further, an upper hole 41 is provided in the top surface portion 33 of the cover portion 12. The upper hole 41 is necessary as an escape route for air pushed by the magnetic powder liquid sprayed from the lower hole 43. When the air is filled by spraying the magnetic powder liquid from the prepared hole 43, the air flows so as to escape upward. The upper hole 41 is not necessarily provided on the top surface portion 33. For example, in the present embodiment, the outer surface portion 31 near the top surface portion 33 of the cover portion 12 and the inner side surface upper portion 46 are cylindrical. The cylindrical portion protrudes upward and the top surface portion 33 thereof is blocked. For example, the cylindrical portion near the top surface portion 33 of the cover portion 12 is mesh-like, and the external space and the internal space 42 are connected to each other. The same effect can be obtained by using the above configuration. Therefore, it suffices if there is an upper hole 41 in or near the top surface portion 33, and even if the upper hole 41 is not completely hollow, it may be covered with a mesh or other known configuration as long as there is no problem as an air escape route. good.

図２は、カバー部１２の底面図である。カバー部１２の底面には下孔４３が設けられ、下孔４３は図５に示すようにカバー部１２の内部の空間４２に連通している。 FIG. 2 is a bottom view of the cover portion 12. A pilot hole 43 is provided on the bottom surface of the cover portion 12, and the pilot hole 43 communicates with the space 42 inside the cover portion 12 as shown in FIG.

次に、搬送用台座２０について詳述する。図３に示すように、搬送用台座２０は、支持部２１を４つ備えている。ただ、被検査物１０を支持可能であり、かつ後術する磁粉液散布時の磁粉液の通り道が十分に確保される形状であれば、どのような形状であってもよい。例えば、図１３のような形としてもよい。図１３の（a）は支持部２１の本実施形態の他の一例の上面図、（ｂ）は側面図、（ｃ）は支持部２１と、搬送用台座２０と、被検査物１０をともに示した斜視図である。このように支持部は１つであってもよいし複数であってもよい。 Next, the transport pedestal 20 will be described in detail. As shown in FIG. 3, the transport pedestal 20 includes four support portions 21. However, any shape may be used as long as it can support the object 10 to be inspected and a sufficient path for the magnetic powder liquid to be sprayed at the time of spraying the magnetic powder liquid to be performed later is secured. For example, it may have a shape as shown in FIG. FIG. 13A is a top view of another example of the present embodiment of the support portion 21, FIG. 13B is a side view, and FIG. 13C is a support portion 21, a transport pedestal 20, and an object to be inspected 10. It is a perspective view shown. As described above, the number of support portions may be one or a plurality.

さらに、後述する図５、図６、図１０等の状態の磁粉液散布時のカバー部１２と搬送用台座２０の位置関係は、カバー部１２の下に搬送用台座２０が、磁粉液が漏れが少ないような狭い隙間を有し、かつ下孔４３の大きさ、形状は、搬送用台座２０の支持部２１を覆う形であり、磁粉液の流路を著しく遮らなければどのような形でもよい。例えば下孔４３は四角形状であってもよいし、三角形状であってもよい。ただし、下孔４３の大きさとの関係で、搬送用台座２０の上面２４からはみ出ない形状、大きさの下孔４３であることが好ましい。そうでないと、磁粉液が、搬送用台座２０とカバー部１２の隙間から大量に漏れてしまい、磁粉液の供給速度や検査速度が落ちてしまうこととなる。漏れ量は供給量の約5％以下であれば実用上問題ない。 Further, regarding the positional relationship between the cover portion 12 and the transport pedestal 20 when the magnetic powder liquid is sprayed in the states shown in FIGS. 5, 6, and 10, the transport pedestal 20 leaks the magnetic powder liquid under the cover portion 12. The size and shape of the prepared hole 43 is such that it covers the support portion 21 of the transport pedestal 20 and has any shape as long as it does not significantly block the flow path of the magnetic powder liquid. good. For example, the prepared hole 43 may have a quadrangular shape or a triangular shape. However, in relation to the size of the prepared hole 43, it is preferable that the prepared hole 43 has a shape and size that does not protrude from the upper surface 24 of the transport pedestal 20. Otherwise, a large amount of magnetic powder liquid will leak from the gap between the transport pedestal 20 and the cover portion 12, and the supply speed and inspection speed of the magnetic powder liquid will decrease. If the amount of leakage is about 5% or less of the amount of supply, there is no problem in practical use.

次に、本発明の磁粉探傷用磁粉液散布装置１の動作を流れに沿って示す。 Next, the operation of the magnetic particle liquid spraying device 1 for magnetic particle flaw detection of the present invention is shown along the flow.

まず、図７、図８の状態で、被検査物１０が搬送用台座２０に、支持部２１に支持される形で載置され、チェインレール２３によって所定位置Ａまで搬送される。（ステップ１） First, in the states of FIGS. 7 and 8, the object to be inspected 10 is placed on the transport pedestal 20 in a form supported by the support portion 21, and is transported to the predetermined position A by the chain rail 23. (Step 1)

所定位置Ａに搬送されると、図９に示されるように、チェインレール２３は一時停止し、カバー片１２Ａ、１２Ｂが、被検査物１０を覆う準備がなされている状態となる。（ステップ２） When transported to the predetermined position A, as shown in FIG. 9, the chain rail 23 is temporarily stopped, and the cover pieces 12A and 12B are ready to cover the object 10 to be inspected. (Step 2)

所定位置Ａにおいて、図４、図１０、図１１に示すように、被検査物１０がカバー部１２と搬送用台座２０により覆われる。（ステップ３） At the predetermined position A, as shown in FIGS. 4, 10 and 11, the object to be inspected 10 is covered with the cover portion 12 and the transport pedestal 20. (Step 3)

所定位置Ａにおいて、図１２に示すように、カバー部１２が、散布ノズル部１３により、磁粉液で満たされる。（ステップ４） At the predetermined position A, as shown in FIG. 12, the cover portion 12 is filled with the magnetic powder liquid by the spray nozzle portion 13. (Step 4)

所定位置Ａにおいて、その近傍に設けられた図示せぬ磁化装置により、磁界を発生させることで被検査物１０の磁化を開始する。（ステップ５） At a predetermined position A, a magnetizing device (not shown) provided in the vicinity thereof starts magnetization of the object 10 to be inspected by generating a magnetic field. (Step 5)

所定位置Ａにおいて、図４、図１０に示す状態から、図９に示す状態になる。すなわちカバー部１２が分離し、カバー片１２Ａ、１２Ｂに戻り、磁粉液が下方に排水される。（ステップ６） At the predetermined position A, the state shown in FIGS. 4 and 10 changes to the state shown in FIG. That is, the cover portion 12 is separated, returns to the cover pieces 12A and 12B, and the magnetic powder liquid is drained downward. (Step 6)

ステップ５で開始していた磁化装置による被検査物１０の磁化を、終了する。（ステップ７） The magnetization of the object to be inspected 10 by the magnetization device, which was started in step 5, is completed. (Step 7)

ステップ３の状態の場合に、カバー部１２と搬送用台座２０の間の隙間がないように、カバー部１２の動きを制御することが好適である。このようにすることで、磁粉液の漏れを防止することができる。なお、ステップ４の磁粉液で満たされる水位としては、被検査物１０より上の水位であれば足り、より好ましくは傷を検査し、探傷しようとする探傷範囲より、上の水位であると好適である。 In the case of the state of step 3, it is preferable to control the movement of the cover portion 12 so that there is no gap between the cover portion 12 and the transport pedestal 20. By doing so, it is possible to prevent leakage of the magnetic powder liquid. As the water level filled with the magnetic powder liquid in step 4, a water level higher than that of the object to be inspected 10 is sufficient, and more preferably, the water level is higher than the flaw detection range in which the scratch is inspected and the flaw is to be detected. Is.

被検査物１０は以上のような手順で表面に磁粉液が散布される。カバー部１２は、磁粉液で満たされる。その結果、本発明に係るカバー部１２や搬送用台座２０なしで、散布ノズルで側面や上面から散布した場合に比べて、被検査物１０の表面を流れる磁粉液の流速を遅くすることができる。その結果、浅い傷であっても、確実に傷の検出をすることができる。かつ、浸漬法よりも早く検査をすることができ、サイクルタイムが短くなる。ただし、上部散布ノズルや側部散布ノズルを併用した場合、散布ノズル部からの散布に比べて急速に磁粉液を供給することができるため、好適である。 The magnetic powder liquid is sprayed on the surface of the object 10 to be inspected by the above procedure. The cover portion 12 is filled with a magnetic powder liquid. As a result, the flow velocity of the magnetic powder liquid flowing on the surface of the object to be inspected 10 can be slowed down as compared with the case where the spray nozzle sprays from the side surface or the upper surface without the cover portion 12 or the transport pedestal 20 according to the present invention. .. As a result, even a shallow scratch can be reliably detected. Moreover, the inspection can be performed faster than the dipping method, and the cycle time is shortened. However, when the upper spray nozzle and the side spray nozzle are used in combination, the magnetic powder liquid can be supplied more rapidly than the spray from the spray nozzle portion, which is preferable.

また、散布ノズル部１３から磁粉液が散布されることで、被検査物１０の下方から磁粉液が散布されることになり、被検査物１０の凹凸によっても、気泡がたまったりすることなく、気泡を上孔４１に逃がすように磁粉液を満たしていくことができる。上孔４１からのみ磁粉液を供給する場合は、被検査物１０の凹凸のある表面に気泡が残ってしまう場合があるため、本発明の散布ノズル部１３が下方から磁粉液を供給可能であることは、好適である。 Further, by spraying the magnetic powder liquid from the spray nozzle portion 13, the magnetic powder liquid is sprayed from below the object to be inspected 10, and the unevenness of the object to be inspected 10 does not cause bubbles to accumulate. The magnetic powder liquid can be filled so as to allow air bubbles to escape to the upper hole 41. When the magnetic powder liquid is supplied only from the upper hole 41, air bubbles may remain on the uneven surface of the object to be inspected 10, so that the spray nozzle portion 13 of the present invention can supply the magnetic powder liquid from below. That is preferable.

ステップ５により流出した磁粉液は、本発明の磁粉探傷用磁粉液散布装置１より下方に設けられた図示せぬ貯水槽に貯められ、再利用される。 The magnetic powder liquid that has flowed out in step 5 is stored in a water tank (not shown) provided below the magnetic particle liquid spraying device 1 for magnetic particle inspection of the present invention and reused.

カバー片１２Ａ、１２Ｂは、２つであるものの、特に２つに分離することに限定するものではなく、３つでも４つでも可能な構成であればよい。 Although the cover pieces 12A and 12B are two, the cover pieces are not particularly limited to two, and any configuration may be used as long as three or four cover pieces are possible.

また、カバー部１２の外側面部３１に、空間４２に連通している中穴部４５を設け、この近傍から側部散布ノズル５１により磁粉液を散布することとしてもよい。このように構成することで、多くのノズルから素早く磁粉液を供給することができる。 Further, the outer surface portion 31 of the cover portion 12 may be provided with an intermediate hole portion 45 communicating with the space 42, and the magnetic powder liquid may be sprayed from the vicinity thereof by the side spray nozzle 51. With this configuration, the magnetic powder liquid can be quickly supplied from many nozzles.

また、図示せぬタンクを散布ノズル部１３やカバー部１２よりも上方に配置することは、タンクが上方にある分を差し引いた仕事量のポンプを使うことでも、本実施形態のノズルの噴射に必要となる仕事量を確保することができるため、好適である。 Further, by arranging the tank (not shown) above the spray nozzle portion 13 and the cover portion 12, the nozzle injection according to the present embodiment can be performed by using a pump having a work load obtained by subtracting the amount of the tank above. It is preferable because the required amount of work can be secured.

磁粉液散布量として、従来の通常のノズルを用いた散布方法によれば、本発明の被検査物と同様の鍛造部品に対し、磁粉液散布流量は毎分約２０〜６０リットルを、散布時間２秒で行っていた。この鍛造部品は、上部外径が４０ミリメートル、上部の高さ１００ミリメートル、下部外径が１２０ミリメートル、下部の高さ３０センチメートルである。本発明によれば、被検査物とカバーの内側面下部４４との間隔Ｌを２０ミリメートルとすると、空間４２から、被検査物１０の体積を除く体積は約１．４リットルとなる。磁粉液散布量を毎分４０リットルとし、カバーから漏れる水量を毎分１リットルとすると、磁粉液散布時間は、約２．２秒となる。従って、本発明では、従来とほぼ変わらない磁粉液の流量、時間で、浸漬法のような高い安定した検出力を確保することができる。 As the amount of magnetic powder sprayed, according to the conventional spraying method using a normal nozzle, the magnetic powder liquid spraying flow rate is about 20 to 60 liters per minute for the same forged part as the object to be inspected of the present invention. It took 2 seconds. The forged part has an upper outer diameter of 40 mm, an upper height of 100 mm, a lower outer diameter of 120 mm, and a lower height of 30 cm. According to the present invention, assuming that the distance L between the object to be inspected and the lower inner surface 44 of the cover is 20 mm, the volume excluding the volume of the object to be inspected 10 from the space 42 is about 1.4 liters. Assuming that the amount of magnetic powder sprayed is 40 liters per minute and the amount of water leaking from the cover is 1 liter per minute, the magnetic powder liquid spraying time is about 2.2 seconds. Therefore, in the present invention, it is possible to secure a high stable power as in the dipping method at a flow rate and time of the magnetic powder liquid which is almost the same as the conventional one.

なお、磁粉指示模様を好適に形成する観点において、通常の散布方法であれば、被検査物１０の表面を流れる磁粉液の流速は、約２ｍｍ／ｓ〜１００ｍｍ／ｓであることが好ましいとされる。流速が１００ｍｍ／ｓより大であると、磁粉が漏洩磁束に引き止められずに流されてしまい、磁粉指示模様が形成されにくくなる。そして、傷部の検出漏れが生じて、傷部の検出確度が低下する。一方、流速が２ｍｍ／ｓより小であると、磁粉指示模様が形成されるまでに多くの時間を要する。 From the viewpoint of preferably forming the magnetic powder instruction pattern, it is said that the flow velocity of the magnetic powder liquid flowing on the surface of the object 10 to be inspected is preferably about 2 mm / s to 100 mm / s if it is a normal spraying method. NS. If the flow velocity is larger than 100 mm / s, the magnetic powder is flown without being held by the leakage magnetic flux, and it becomes difficult to form the magnetic powder instruction pattern. Then, the detection omission of the scratched portion occurs, and the detection accuracy of the scratched portion decreases. On the other hand, if the flow velocity is less than 2 mm / s, it takes a lot of time until the magnetic powder instruction pattern is formed.

しかし本発明によれば、カバー部１２を磁粉液で満たすことによって、被検査物１０の表面を磁粉液で浸漬する方法がとられている。このため、散布ノズル部１３における流速にほぼ関係なく、安定した検出力を確保することができる。 However, according to the present invention, a method is adopted in which the surface of the object to be inspected 10 is immersed in the magnetic powder liquid by filling the cover portion 12 with the magnetic powder liquid. Therefore, a stable power can be secured regardless of the flow velocity in the spray nozzle portion 13.

本開示の磁粉探傷用磁粉液散布装置及び磁粉探傷用磁粉液散布方法は、磁粉を用いて探傷を行う磁粉探傷装置、及び磁粉探傷方法に好適に利用することができる。しかしながら、本開示は、上述された実施形態に限定されるものではない。本開示の磁粉探傷装置、及び磁粉探傷方法は、例えばシャフトやパイプ等の断面の外形が略円形である被検査物１０の外周面の探傷に有用であり、外周面にスプラインやねじ構造等の凹凸部を有するものの探傷にも利用することができる。 The magnetic particle liquid spraying device for magnetic particle flaw detection and the magnetic powder liquid spraying method for magnetic powder flaw detection of the present disclosure can be suitably used for a magnetic particle flaw detector that performs flaw detection using magnetic powder and a magnetic particle flaw detection method. However, the present disclosure is not limited to the embodiments described above. The magnetic particle flaw detection device and the magnetic particle flaw detection method of the present disclosure are useful for flaw detection of the outer peripheral surface of an object 10 to be inspected having a substantially circular outer shape of a cross section such as a shaft or a pipe, and have a spline or a screw structure on the outer peripheral surface. It can also be used for flaw detection even though it has uneven parts.

１ 磁粉探傷用磁粉液散布装置
１０ 被検査物
１２ カバー部
１２Ａ、１２Ｂ カバー片
１３ 散布ノズル部
２０ 搬送用台座
２１ 支持部
２２ 穴部
２３ チェインレール
２４ 上面
３１ 外側面部
３２ 内側面部
３３ 天面部
３４ 底面部
４１ 上孔
４２ 空間
４３ 下孔
４４ 内側面 1 Magnetic particle inspection magnetic particle spraying device 10 Inspected object 12 Cover part 12A, 12B Cover piece 13 Spraying nozzle part 20 Transport pedestal 21 Support part 22 Hole part 23 Chain rail 24 Top surface 31 Outer side surface part 32 Inner side surface part 33 Top surface part 34 Bottom surface Part 41 Upper hole 42 Space 43 Lower hole 44 Inner surface

Claims (7)

被検査物を搬送する搬送部と、カバー部、散布ノズル部、磁粉液供給部を備える磁粉探傷用磁粉液散布装置であって、前記搬送部は搬送用台座を備え、該搬送用台座は複数の支持部と、穴部を備え、前記搬送部の下方に前記散布ノズル部が備えられ、前記カバー部は中空状で二つ以上に分離可能であり、前記カバー部は外側面部、内側面部、天面部、底面部を有し、前記天面部は上孔を有し、前記内側面部は上孔と連通した空間を有し、前記底面部は、前記空間に連通した下孔を有し、前記内側面部は、前記被検査物と接触しないことが可能な形、大きさの前記空間を備えることを特徴とする、磁粉探傷用磁粉液散布装置。 A magnetic particle inspection magnetic powder spraying device including a transport unit for transporting an object to be inspected, a cover portion, a spray nozzle portion, and a magnetic powder liquid supply unit. The transport unit is provided with a transport pedestal, and the transport pedestal is a plurality. The spray nozzle portion is provided below the transport portion, the cover portion is hollow and can be separated into two or more, and the cover portion has an outer surface portion, an inner side surface portion, and the like. The top surface portion has a top surface portion and a bottom surface portion, the top surface portion has an upper hole, the inner side surface portion has a space communicating with the upper hole, and the bottom surface portion has a pilot hole communicating with the space. A magnetic particle liquid spraying device for magnetic particle flaw detection, wherein the inner side surface portion is provided with the space having a shape and a size that can prevent contact with the object to be inspected. 前記空間と前記被検査物の形状は、大きさが異なる略同一形状であって、前記内側面部の内側面下部と前記被検査物の間隔は、５ミリメートル以上３０ミリメートル以下であることが可能なように、前記内側面部が形成されていることを特徴とする、請求項１に記載の磁粉探傷用磁粉液散布装置。 The space and the shape of the object to be inspected are substantially the same shape having different sizes, and the distance between the lower part of the inner surface of the inner side surface portion and the object to be inspected can be 5 mm or more and 30 mm or less. The magnetic powder liquid spraying device for magnetic particle flaw detection according to claim 1, wherein the inner side surface portion is formed as described above. 前記支持部はカバーに干渉しないことが可能であって、前記被検査物との接触面積が小さい形状であり、前記搬送用台座に対し着脱可能であることを特徴とする、請求項１〜２に記載の磁粉探傷用磁粉液散布装置。 Claims 1 and 2, wherein the support portion does not interfere with the cover, has a shape having a small contact area with the object to be inspected, and is removable from the transport pedestal. The magnetic particle liquid spraying device for magnetic particle flaw detection described in 1. 前記カバー部の前記外側面部に、前記空間に連通する中穴部を１または複数設け、該中穴部近傍にそれぞれ側部散布ノズルを設けたことを特徴とする、請求項１〜３に記載の磁粉探傷用磁粉液散布装置。 13. Magnetic particle spraying device for magnetic particle inspection. 前記上孔の近傍に上部散布ノズルを設けることを特徴とする、請求項１〜４に記載の磁粉探傷用磁粉液散布装置。 The magnetic particle liquid spraying device for magnetic particle flaw detection according to any one of claims 1 to 4, wherein an upper spray nozzle is provided in the vicinity of the upper hole. 前記磁粉液供給部は配管と、前記搬送部、前記散布ノズルのそれぞれよりも上方に位置するタンクを有することを特徴とする、請求項１〜５に記載の磁粉探傷用磁粉液散布装置。 The magnetic particle liquid spraying device for magnetic particle flaw detection according to claim 1, wherein the magnetic powder liquid supply unit has a pipe, a tank located above each of the transport unit and the spray nozzle. 被検査物を搬送用台座に載置し、所定位置まで搬送した後、前記被検査物の表層部を磁化するとともに磁粉液を散布し、傷部に磁粉指示模様を形成し、傷部の検出を行う磁粉探傷方法における磁粉探傷用磁粉液散布方法において、前記所定位置において、前記被検査物を覆うことのできる筒状の１つのカバー部となる複数のカバー片を接合することにより、前記被検査物を、前記搬送用台座とともに覆い、前記所定位置における前記被検査物の下方から散布ノズルにより磁粉液を散布し、前記カバー部の内部を、磁粉液で、少なくとも被検査物より上の水位となるまで満たすことを特徴とする、磁粉探傷用磁粉液散布方法。 After placing the object to be inspected on a transport pedestal and transporting it to a predetermined position, the surface layer of the object to be inspected is magnetized and the magnetic powder liquid is sprayed to form a magnetic particle instruction pattern on the scratched part to detect the scratched part. In the magnetic particle liquid spraying method for magnetic particle inspection in the magnetic particle inspection method, the subject is joined by joining a plurality of cover pieces to be one tubular cover portion capable of covering the object to be inspected at the predetermined position. The inspection object is covered together with the transport pedestal, and the magnetic powder liquid is sprayed from below the inspection object at the predetermined position by a spray nozzle. A method of spraying magnetic powder liquid for magnetic particle inspection, which is characterized by filling until it becomes.
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