JPH05164744A - Magnetic particle testing method - Google Patents
Magnetic particle testing methodInfo
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- JPH05164744A JPH05164744A JP32784791A JP32784791A JPH05164744A JP H05164744 A JPH05164744 A JP H05164744A JP 32784791 A JP32784791 A JP 32784791A JP 32784791 A JP32784791 A JP 32784791A JP H05164744 A JPH05164744 A JP H05164744A
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Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、機械加工時に被加工
物に生じる割れや傷などの検査を磁粉を用いて行う磁粉
探傷方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic particle flaw detection method for inspecting cracks, scratches and the like that occur in a workpiece during machining using magnetic powder.
【０００２】[0002]
【従来の技術】従来、機械加工時に被加工物に生じる割
れや傷などを検査する方法として磁粉探傷方法が多用さ
れている。この磁粉探傷方法は、加工済の被加工物を被
測定物とし、これを磁化した後、微細な蛍光磁粉を振り
かけ、被測定物に割れや傷などの欠陥があったときに生
じる漏洩磁束により欠陥部に磁粉を付着させる。この付
着させた磁粉により生じる模様をＴＶカメラで撮像し、
欠陥の有無や位置を検知することができるものである。
この方法を実施するための装置の一例としては、実開平
１ー１４１４６０号公報に記載された磁粉探傷装置が知
られている。なお、被測定物を磁化する手段としては、
被測定物に直接電流を流し円周方向の磁束を発生させて
磁化する軸通電法と、コイルを用いて軸方向の磁束を発
生させるコイル法とを併用する手段がよく用いられる。2. Description of the Related Art Conventionally, a magnetic particle flaw detection method has been widely used as a method for inspecting cracks, scratches, and the like that occur in a workpiece during machining. This magnetic powder flaw detection method uses a processed workpiece as the measured object, magnetizes it, sprinkles fine fluorescent magnetic particles, and causes leakage magnetic flux generated when the measured object has defects such as cracks and scratches. Magnetic particles are attached to the defective part. A TV camera takes an image of the pattern created by the magnetic powder that is attached,
It is possible to detect the presence or absence and the position of a defect.
As an example of an apparatus for carrying out this method, a magnetic particle flaw detector described in Japanese Utility Model Publication No. 1-1141460 is known. In addition, as a means for magnetizing the DUT,
A means is often used in which an axial energization method in which an electric current is directly applied to an object to be measured to generate a magnetic flux in the circumferential direction to magnetize it and a coil method in which a coil is used to generate a magnetic flux in the axial direction are used together.
【０００３】[0003]
【発明が解決しようとする課題】従来の課題 しかし、スプライン部などのように複雑な形状を有する
部品を磁粉探傷するために前記手段で磁化すると、欠陥
部以外の段差やエッジ部で磁束の洩れを生じ、これらの
部分に磁粉が付着して割れや傷などの欠陥による磁粉の
付着との区別がつきにくくなり、ＴＶカメラと画像処理
を用いた自動探傷方法の実現を困難にしている。[SUMMARY OF THE INVENTION A conventional problems, however, when a component having a complicated shape such as a spline portion magnetized by said means for magnetic particle, leakage of magnetic flux in the step or edge portion other than the defective portion The magnetic powder adheres to these portions, making it difficult to distinguish from the magnetic powder adhered due to defects such as cracks and scratches, which makes it difficult to realize an automatic flaw detection method using a TV camera and image processing.
【０００４】図６は、図２に示すような外周部にスプラ
イン部２を有する部品を従来の方法により磁化した場合
の磁束密度分布の一例を示しており、スプライン部２の
谷部２ａでは、たとえ傷がない場合でも山部２ｂより漏
洩磁束が大きくなる。したがって、通常の強さの磁化を
行うと、谷部２ａでは磁粉が付着する最低限の漏洩磁束
量を越えてしまい、傷がない場合でも磁粉が付着して傷
と見誤ることになる。一方、このような磁粉の付着を防
ぐために磁化を弱めると、山部２ｂの傷部の漏洩磁束が
弱まり、山部２ｂの傷や割れに磁粉が付着せず、欠陥を
検出できなくなるという問題点があった。従って、上記
問題点を解消しなければならないという課題がある。FIG. 6 shows an example of a magnetic flux density distribution when a component having a spline portion 2 on the outer peripheral portion as shown in FIG. 2 is magnetized by a conventional method, and a valley portion 2a of the spline portion 2 has Even if there is no scratch, the leakage magnetic flux is larger than that of the mountain portion 2b. Therefore, when magnetizing with a normal strength, the minimum leakage magnetic flux amount to which the magnetic powder adheres is exceeded in the valley portion 2a, and even if there is no scratch, the magnetic powder adheres and is mistaken as a scratch. On the other hand, if the magnetization is weakened to prevent such magnetic particles from adhering, the leakage magnetic flux at the scratched portion of the mountain portion 2b weakens, and the magnetic particles do not adhere to the scratches or cracks of the mountain portion 2b, making it impossible to detect defects. was there. Therefore, there is a problem that the above problems must be solved.
【０００５】発明の目的 この発明は、上記課題を解決するためになされたもの
で、スプライン部のような複雑な形状を有する部品の段
差やエッジ部、谷部など漏洩磁束を生じやすい部分に、
実際には割れや傷などの欠陥を有しないにもかかわらず
磁粉が付着して欠陥と見誤らさせることがなく、割れや
傷等の欠陥の有無の判別を正確に行うことができる磁粉
探傷方法を提供することを目的とする。SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and can be applied to a portion such as a spline portion having a complicated shape such as a step, an edge portion, a valley portion, etc., where a leakage magnetic flux is likely to occur.
A magnetic particle flaw detection method that can accurately determine the presence or absence of defects such as cracks and scratches without the fact that magnetic particles adhere and are not mistaken for defects even though they do not actually have defects such as cracks and scratches. The purpose is to provide.
【０００６】[0006]
【課題を解決するための手段】この発明による磁粉探傷
方法は、被測定物を磁化し、これに微細な磁粉を振りか
け、被測定物に割れや傷などの欠陥があったときに生じ
る漏洩磁束により欠陥部に磁粉を付着させ、この付着さ
せた磁粉により、欠陥の有無や位置を検知する方法であ
り、被測定物の測定部位によって、磁化強度を変えて磁
粉探傷を行うようにしたものである。A magnetic particle flaw detection method according to the present invention magnetizes an object to be measured, sprinkles fine magnetic particles on the object, and leaks magnetic flux generated when the object to be measured has defects such as cracks and scratches. This is a method to attach magnetic powder to the defective part by this, and to detect the presence or absence of a defect and the position by this attached magnetic powder, and to perform magnetic particle flaw detection by changing the magnetization intensity depending on the measurement site of the measured object. is there.
【０００７】[0007]
【作用】この発明に係る磁粉損傷方法では、被測定物の
磁化のための電流を流し、被測定物を磁化する。この
時、漏洩磁束を生じやすい部位と漏洩磁束を生じくい部
位とでは磁化強度を変える。磁化強度のレベルは被測定
物に応じて任意に変化させて行う。すなわち、被測定物
に低い電流を流して磁化し、この磁化された被測定物に
磁粉を散布し、磁粉の付着状態から被測定物の割れや傷
などの欠陥を評価する。In the magnetic powder damage method according to the present invention, a current for magnetizing the object to be measured is supplied to magnetize the object to be measured. At this time, the magnetization intensity is changed between the portion where the leakage magnetic flux is easily generated and the portion where the leakage magnetic flux is hard to generate. The level of magnetization intensity is arbitrarily changed according to the object to be measured. That is, a low current is applied to the object to be measured to magnetize it, magnetic particles are sprayed on the magnetized object to be measured, and defects such as cracks and scratches on the object to be measured are evaluated from the adhered state of the magnetic particles.
【０００８】次に、被測定物に対して前回よりも強く磁
化し、同じ磁粉を散布、付着させ、磁粉探傷する。Next, the object to be measured is magnetized more strongly than the previous time, and the same magnetic particles are scattered and adhered to detect the magnetic particles.
【０００９】以上のような操作を任意の回数繰り返すこ
とにより、全ての部分の割れや傷などの欠陥の有無の判
別を十分正確に行うことができる。By repeating the above operation an arbitrary number of times, it is possible to sufficiently accurately determine the presence or absence of defects such as cracks and scratches in all parts.
【００１０】[0010]
【実施例】実施例１ 以下、この発明の一実施例を図に基づいて説明する。図
１は、この発明による磁粉探傷方法を適用した磁粉探傷
装置の概略構成を示す説明図である。図１において、１
は、ワークすなわち被測定物であり、外周部に図２に示
すようなスプライン部２を有し、両端をワークホルダ３
に支持されている。スプライン部２は谷部２ａと山部２
ｂとからなっている。４はコイル、また、５は、ワーク
ホルダ３を介してワーク１に軸通電流を流すためのブラ
シである。スプライン部２の下方には、スプライン部２
に磁粉を散布するための磁粉スプレー６が配設されてい
る。７は、ワークホルダ３の回転角度を検知するための
回転角度センサであり、その角度検知出力によりストロ
ボ８を予め設定された角度で点灯するようになってい
る。９はＴＶカメラ、１０は画像処理装置である。Embodiment 1 An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory view showing a schematic configuration of a magnetic particle flaw detector to which a magnetic particle flaw detection method according to the present invention is applied. In FIG. 1, 1
Is a work, that is, an object to be measured, has a spline portion 2 as shown in FIG.
Supported by. The spline portion 2 is a valley portion 2a and a mountain portion 2
It consists of b and. Reference numeral 4 is a coil, and 5 is a brush for passing an axial current to the work 1 via the work holder 3. Below the spline section 2, the spline section 2
A magnetic powder spray 6 for spraying the magnetic powder is disposed on. Reference numeral 7 denotes a rotation angle sensor for detecting the rotation angle of the work holder 3, and the strobe 8 is turned on at a preset angle by the angle detection output. Reference numeral 9 is a TV camera, and 10 is an image processing device.
【００１１】次に動作について説明する。ワーク１の磁
化は、コイル４とブラシ５からの軸通電流による複合磁
化によりなされるが、谷部２ａを測定するときと山部２
ｂを測定するときとで磁化のための電流の強さを変え
る。すなわち、まず谷部２ａの測定、評価を行うため
に、ワーク１に低い電流を流し、弱磁化を行う。そし
て、磁化されたワーク１に磁粉スプレー６から磁粉を散
布しながら、図示を省略した駆動源によりワーク１を回
転させる。しかるべき回転角度を回転角度センサ７で検
知し、あらかじめ設定された角度でストロボ８を点灯
し、磁粉を散布したワーク１をＴＶカメラ９で撮像し、
画像処理装置１０で処理判定する。ワーク１の全周を撮
像、処理、判定したら、次に磁化の強度を上げ、上記と
同じステップを経てスプライン部２の山部２ｂの撮像、
処理、判定を行う。この時谷部２ａは、必要以上の磁束
密度となるので、この部分に磁粉が必要以上に付着す
る。したがって、画像処理の中でこの部分をカットする
ためのマスキング処理を施す。Next, the operation will be described. The magnetization of the work 1 is made by the composite magnetization by the axial currents from the coil 4 and the brush 5, but when the valley 2a is measured and the peak 2
The intensity of the current for magnetization is changed depending on when and when b is measured. That is, first, in order to measure and evaluate the valley portion 2a, a low current is applied to the work 1 to perform weak magnetization. Then, while the magnetic powder is sprayed from the magnetic powder spray 6 onto the magnetized work 1, the work 1 is rotated by a drive source (not shown). The rotation angle sensor 7 detects an appropriate rotation angle, the strobe 8 is turned on at a preset angle, and the TV camera 9 captures an image of the work 1 on which magnetic powder is dispersed.
The image processing apparatus 10 determines processing. When the entire circumference of the work 1 is imaged, processed, and determined, the intensity of magnetization is increased next, and the mountain portion 2b of the spline portion 2 is imaged through the same steps as above.
Perform processing and judgment. At this time, since the valley portion 2a has a magnetic flux density more than necessary, magnetic powder adheres to this portion more than necessary. Therefore, masking processing for cutting this portion is performed in the image processing.
【００１２】図３は、この発明によるスプライン部を有
する部品の磁粉探傷方法のプロセスを示すフロー図であ
る。ステップ１０１で被測定物を弱磁化し、次いでステ
ップ１０２で磁粉散布し、ステップ１０３で磁粉の付着
状況をＴＶカメラにより撮像する。続くステップ１０４
で画像処理１を行った後、ステップ１０５で被測定物を
所定角度回転送りし、ステップ１０６で、被測定物が３
６０度回転したか否かを判定する。ＮＯの場合、すなわ
ち被測定物が３６０度回転していない場合は、ステップ
１０３に戻ってステップ１０６までの間を繰り返し実行
する。FIG. 3 is a flow chart showing a process of a magnetic particle flaw detection method for a component having a spline portion according to the present invention. In step 101, the object to be measured is weakly magnetized, then in step 102, the magnetic powder is sprayed, and in step 103, the adhesion state of the magnetic powder is imaged by a TV camera. Continued Step 104
After performing the image processing 1 in step 105, the object to be measured is rotated by a predetermined angle in step 105, and in step 106, the object to be measured is moved to 3
It is determined whether or not it has rotated 60 degrees. In the case of NO, that is, when the DUT has not rotated 360 degrees, the process returns to step 103 and the steps up to step 106 are repeated.
【００１３】前記ステップ１０６の判定がＹＥＳの場合
は、次のステップ１０７に進み、被測定物を強磁化し、
次いでステップ１０８磁粉散布、ステップ１０９撮像、
ステップ１１０画像処理２、ステップ１１１回転送りの
各ステップを経て、ステップ１１２に進み、被測定物が
３６０度回転したか否かを判定する。判定がＮＯの場
合、すなわち被測定物が３６０度回転していない場合は
ステップ１０９に戻ってステップ１１２までの間を繰り
返し実行する。前記ステップ１１２の判定がＹＥＳの場
合は、全フローを終了する。If the determination in step 106 is YES, the process proceeds to the next step 107 to strongly magnetize the object to be measured,
Next, Step 108 magnetic powder spraying, Step 109 imaging,
After each of step 110, image processing 2 and step 111 rotation feeding, the process proceeds to step 112, and it is determined whether or not the measured object has rotated 360 degrees. When the determination is NO, that is, when the measured object has not rotated 360 degrees, the process returns to step 109 and the steps up to step 112 are repeatedly executed. If the determination in step 112 is YES, the entire flow ends.
【００１４】図４は、低い磁化を得るために低い電流で
磁化させたときのスプライン部２の磁束密度分布を磁場
解析法により求めた結果を示す。図は傷のないスプライ
ン部２の谷部２ａの漏洩磁束密度が十分低く、約０．０
２テスラ以下の場合であり、どの部分にも磁粉が付着し
ていない状態が示されており、スプライン部２の谷部２
ａに傷がないことを表している。なお、０．０２テスラ
以下の場合は磁粉が付着しないことが実験で確認されて
いる。FIG. 4 shows a result of magnetic flux density distribution of the spline portion 2 obtained by magnetizing with a low current in order to obtain low magnetization by a magnetic field analysis method. The figure shows that the leakage magnetic flux density of the valley portion 2a of the spline portion 2 having no scratch is sufficiently low and is about 0.0
In the case of 2 Tesla or less, the magnetic powder is not attached to any part, and the valley part 2 of the spline part 2 is shown.
This indicates that a has no scratch. It has been confirmed by experiments that magnetic particles do not adhere when the density is 0.02 Tesla or less.
【００１５】また、図５は、高い電流で磁化したときの
磁束密度分布を示しており、谷部２ａ、傾斜部２ｃとも
傷の有無に関係なく磁粉が付着する密度になっているの
で、これらの部分は画像処理によりマスクして、谷部２
ａの磁粉の付着を無視し、山部２ｂだけを評価する。Further, FIG. 5 shows a magnetic flux density distribution when magnetized with a high current, and the density is such that magnetic particles adhere to both the valley portion 2a and the inclined portion 2c regardless of the presence or absence of scratches. The part of is masked by image processing, and the valley 2
The adhesion of the magnetic powder of a is ignored, and only the mountain portion 2b is evaluated.
【００１６】以上説明したとおり、この実施例による磁
粉探傷方法は、被測定物をまず弱磁化し漏洩磁束が発生
しやすい部分の磁粉探傷を行った後、強磁化し残りの部
分の磁粉探傷を行うようにした構成により、弱磁化の状
態において段差やエッジ部、谷部の漏洩磁束密度が十分
低くなり磁粉が付着しないので、割れや傷などの欠陥の
有無の判別を十分正確に行うことができる。As described above, in the magnetic particle flaw detection method according to this embodiment, first, the magnetic particle flaw detection of the portion where the measured object is weakly magnetized and the leakage magnetic flux is easily generated is performed, and then the strong magnetization is performed to detect the magnetic particle flaw detection of the remaining portion. With this configuration, the magnetic flux density at the steps, edges, and valleys becomes sufficiently low in the weakly magnetized state, and magnetic particles do not adhere.Therefore, it is possible to accurately determine the presence or absence of defects such as cracks and scratches. it can.
【００１７】なお、上記実施例では弱磁化した場合と強
磁化した場合について述べているが、磁化レベルを多段
階にして測定すればより正確な測定を行うことができ
る。In the above embodiment, the case of weak magnetization and the case of strong magnetization are described, but more accurate measurement can be performed by measuring the magnetization level in multiple stages.
【００１８】実施例２ 前記実施例１は磁粉探傷の場合について示したが、この
発明の方法は、部分毎に適正磁化を施すことができるの
で、磁粉探傷に限定されることなく、磁気センサーによ
る漏洩磁束法にも適用することができる。 Embodiment 2 In Embodiment 1 above, the case of magnetic particle flaw detection was shown. However, since the method of the present invention can apply proper magnetization to each portion, it is not limited to magnetic particle flaw detection, and a magnetic sensor is used. It can also be applied to the leakage flux method.
【００１９】[0019]
【発明の効果】以上説明したとおり、この発明による磁
粉探傷方法は、形状により漏洩磁束を発生しやすい部分
とそれ以外の部分に対して、それぞれに適合した強度の
磁化を施し、それぞれに合致したデータ処理を行う構成
により、弱磁化の状態において段差やエッジ部の漏洩磁
束密度が十分低くなり、欠陥がない場合磁粉が付着しな
いので、割れや傷などの欠陥の有無の判別を十分正確に
行うことができる。As described above, in the magnetic particle flaw detection method according to the present invention, the magnetic flux having a suitable strength is applied to the portion where the leakage magnetic flux is likely to be generated and the other portion due to the shape, and they are matched with each other. With the configuration that performs data processing, the leakage magnetic flux density at the steps and edges is sufficiently low in the weakly magnetized state, and magnetic particles do not adhere if there is no defect, so the presence or absence of defects such as cracks and scratches can be accurately determined. be able to.
【図１】この発明を適用した磁粉探傷装置の概略構成を
示す説明図である。FIG. 1 is an explanatory diagram showing a schematic configuration of a magnetic particle flaw detector to which the present invention is applied.
【図２】この発明による磁粉探傷方法の被測定物の一例
を示すスプライン部を有する部品の要部斜視図である。FIG. 2 is a perspective view of a main part of a component having a spline portion showing an example of an object to be measured by the magnetic particle flaw detection method according to the present invention.
【図３】この発明による磁粉探傷方法のプロセスを示す
フロー図である。FIG. 3 is a flowchart showing a process of a magnetic particle flaw detection method according to the present invention.
【図４】スプライン部を有する部品を低い電流で磁化し
たときの磁束密度分布図である。FIG. 4 is a magnetic flux density distribution diagram when a component having a spline portion is magnetized with a low current.
【図５】同じく高い電流で磁化したときの磁束密度分布
図である。FIG. 5 is a magnetic flux density distribution diagram when magnetized with the same high current.
【図６】スプライン部を有する部品を従来の方法により
磁化したときの磁束密度分布図である。FIG. 6 is a magnetic flux density distribution diagram when a component having a spline portion is magnetized by a conventional method.
１ ワーク（被測定物） ２ スプライン部 ３ ワークホルダ ４ コイル ５ ブラシ ６ 磁粉スプレー ７ 回転角度センサ ８ ストロボ ９ ＴＶカメラ １０ 画像処理装置 1 Work (measurement object) 2 Spline part 3 Work holder 4 Coil 5 Brush 6 Magnetic powder spray 7 Rotation angle sensor 8 Strobe 9 TV camera 10 Image processing device
Claims (1)
振りかけ、被測定物に割れや傷などの欠陥があったとき
に生じる漏洩磁束により欠陥部に磁粉を付着させ、この
付着させた磁粉により、欠陥の有無や位置を検知する磁
粉探傷方法において、被測定物の測定部位によって、磁
化強度を変えて磁粉探傷を行うようにしたことを特徴と
する磁粉探傷方法。1. An object to be measured is magnetized, fine magnetic particles are sprinkled on the object, magnetic flux is adhered to the defective portion by leakage magnetic flux generated when the object to be measured has defects such as cracks and scratches, and the magnetic particles are adhered. In the magnetic powder flaw detection method for detecting the presence or absence of a defect with magnetic powder, the magnetic powder flaw detection method is characterized in that the magnetic powder flaw detection is performed by changing the magnetization intensity depending on the measurement site of the object to be measured.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32784791A JPH05164744A (en) | 1991-12-11 | 1991-12-11 | Magnetic particle testing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32784791A JPH05164744A (en) | 1991-12-11 | 1991-12-11 | Magnetic particle testing method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05164744A true JPH05164744A (en) | 1993-06-29 |
Family
ID=18203650
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP32784791A Pending JPH05164744A (en) | 1991-12-11 | 1991-12-11 | Magnetic particle testing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05164744A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100417512B1 (en) * | 1999-12-28 | 2004-02-05 | 주식회사 포스코 | Strip edge crack detection apparatus and method |
| CN101915802A (en) * | 2010-07-27 | 2010-12-15 | 上海诚友实业有限公司 | Crankshaft magnetic detector |
| CN101949890A (en) * | 2010-07-27 | 2011-01-19 | 上海诚友实业有限公司 | Longitudinal magnetizing device for crankshaft magnetizing machine |
| CN104880507A (en) * | 2015-06-04 | 2015-09-02 | 上海平野磁气有限公司 | Magnetization device of multi-station crank shaft magnetic powder defectoscope |
| CN104931577A (en) * | 2015-06-04 | 2015-09-23 | 上海平野磁气有限公司 | Conveying device of multi-station crankshaft magnetic particle flaw detector |
| CN107894456A (en) * | 2017-10-30 | 2018-04-10 | 共享铸钢有限公司 | A kind of method for casting entirety Magnetic testing |
| JP2019028026A (en) * | 2017-08-03 | 2019-02-21 | 新日鐵住金株式会社 | Magnetizing equipment for magnetic particle flaw detection of long material |
-
1991
- 1991-12-11 JP JP32784791A patent/JPH05164744A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100417512B1 (en) * | 1999-12-28 | 2004-02-05 | 주식회사 포스코 | Strip edge crack detection apparatus and method |
| CN101915802A (en) * | 2010-07-27 | 2010-12-15 | 上海诚友实业有限公司 | Crankshaft magnetic detector |
| CN101949890A (en) * | 2010-07-27 | 2011-01-19 | 上海诚友实业有限公司 | Longitudinal magnetizing device for crankshaft magnetizing machine |
| CN104880507A (en) * | 2015-06-04 | 2015-09-02 | 上海平野磁气有限公司 | Magnetization device of multi-station crank shaft magnetic powder defectoscope |
| CN104931577A (en) * | 2015-06-04 | 2015-09-23 | 上海平野磁气有限公司 | Conveying device of multi-station crankshaft magnetic particle flaw detector |
| JP2019028026A (en) * | 2017-08-03 | 2019-02-21 | 新日鐵住金株式会社 | Magnetizing equipment for magnetic particle flaw detection of long material |
| CN107894456A (en) * | 2017-10-30 | 2018-04-10 | 共享铸钢有限公司 | A kind of method for casting entirety Magnetic testing |
| CN107894456B (en) * | 2017-10-30 | 2021-04-20 | 共享铸钢有限公司 | Method for detecting integral magnetic powder of casting |
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