JP3869510B2 - Production of dry magnetic powder for flaw detection - Google Patents
Production of dry magnetic powder for flaw detection Download PDFInfo
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- JP3869510B2 JP3869510B2 JP01070297A JP1070297A JP3869510B2 JP 3869510 B2 JP3869510 B2 JP 3869510B2 JP 01070297 A JP01070297 A JP 01070297A JP 1070297 A JP1070297 A JP 1070297A JP 3869510 B2 JP3869510 B2 JP 3869510B2
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Description
【０００１】
【発明の属する技術分野】
この発明は、磁粉探傷法に使用する乾式磁粉、特に流動性を向上しかつ粘着性を減少した磁粉探傷用乾式磁粉の製法に関する。
【０００２】
【従来の技術】
鉄鋼材料及び磁性合金鋼等の強磁性体の表面又はその近傍に存在する割れ及びピンホール等の不連続部を欠陥部として検出する磁粉探傷法は、非破壊試験の一つである。即ち、角ビレット、丸ビレット等の鋼材の被検査材に磁粉探傷装置により磁化電流を通すと、欠陥部の磁気抵抗が他の部分より大きくなり、欠陥部のみ磁束が空中に漏洩する。強磁性体の微粉末によりなる磁粉を磁化した被検査材の表面に散布すると、欠陥部に生じた磁気的ひずみによって磁粉が欠陥部に付着し、付着した磁粉は線状、円形状及び分散の磁粉模様を形成して被検査材の欠陥部を表示する。被検査材の表面の欠陥部を検出する磁粉を散布する方法は、乾燥した磁粉を気体に分散させて散布する乾式法と、磁粉を水等の適当な液体に分散、懸濁させて散布する湿式法とに大別される。磁粉によって表示された欠陥部は、グラインダ等の研削機を用いて研削して除去される。
磁粉探傷法では、磁粉は被検査材の表面の欠陥部に弱い磁力により機械的に付着するに過ぎず、特に被検査材の残留磁気が小さいと、磁化通電を解除したり又は被検査材を移動して振動を加えると、磁粉は被検査材の表面から直ちに脱落して磁粉模様が消失する。また被検査材の残留磁気が比較的大きくても、他の物体との接触又は手でこすると容易に剥離する。従って、被検査材の欠陥部を指示する磁粉模様を被検査材の表面上に確実に固定して、欠陥部の表面に付着した磁粉の剥離脱落を防ぐと共に、一層鮮明な磁粉模様を形成して微細な欠陥部を明瞭に指示する必要がある。
従来では、顔料又は染料で着色した熱可塑性物質を表面に付着した着色磁粉を磁化した被検査材上に散布して、被検査材の表面に磁粉模様を形成した後、熱可塑性物質の融点以上に被検査材を加熱して、熱可塑性物質を溶融及び硬化させて被検査材に磁粉模様を固着して固定することにより、磁粉模様の識別度を改善している。
【０００３】
従来の着色磁粉の製造方法は、例えば鉄粉、酸化鉄粉等の磁性粉末と、染料又は顔料と、合成樹脂等の熱可塑性物質と、熱可塑性物質を溶解する溶媒とを十分に混合し、混練する。溶媒に溶解した熱可塑性物質がバインダとなり、磁性粉末に染料又は顔料を付着させる。次に、混合物を固塊物に乾燥した後、所要の粒度に粉砕して分篩する。磁粉の平均粒径はほぼ１５μｍで、最大平均粒径はほぼ６０μｍである。
従来の着色磁粉は、最大粒径がほぼ６０μｍと小さいため流動性が悪く、圧縮空気を用いた磁粉散布器で空気中に分散して磁化した被検査材に散布するとき、着色磁粉が均一に分散しにくい。また、熱可塑性物質を含み粘着性があるため、着色磁粉を散布後、被検査材に軽く振動を与えたり又は静かな空気流を吹きかけて磁粉模様を乱さず磁粉模様以外の余分な着色磁粉を十分に除去することが困難である。このため、磁粉模様と磁粉模様以外の識別度が低下して、明確に欠陥部を指示できない欠点があった。
【０００４】
【発明が解決しようとする課題】
例えば、特公昭５５−４７８１５号公報に示されるように、平均粒径１〜５９０μｍの滑沢剤粉末に４〜１０重量パーセントの着色磁粉を均一に混合して、乾式磁粉の流動性及び粘着性を改善することは公知である。磁粉を混合する滑沢剤粉末は、シリカ系、タルク、ステアリン酸、ステアリン酸ナトリウム、ステアリン酸マグネシウム、ステアリン酸カルシウム、ホウ酸、酸化マグネシウム、安息香酸ナトリウム、ガラスビーズの粉末である。
しかしながら、シリカ系粉末、タルク、ホウ酸、酸化マグネシウム、ガラスビーズは、疎水性ではないので粉末の表面に付着した少量の水が邪魔をして、着色磁粉の流動性が低下する欠点がある。また、ステアリン酸、ステアリン酸ナトリウム、ステアリン酸マグネシウム、ステアリン酸カルシウム、安息香酸ナトリウムの粉末は実際は平均粒径が５μｍ以上で、角張った結晶形のため、着色磁粉の流動性を低下させる。
そこで、この発明は、着色磁粉の流動性を向上して、被検査材表面に均一に分散できると共に、磁粉模様以外の着色磁粉を容易に除去できる磁粉探傷用乾式磁粉の製法を提供することを目的とする。
【０００５】
【課題を解決するための手段】
この発明の磁粉探傷用乾式磁粉の製法は、結着剤、着色材及び磁性粉末を含む着色磁粉を作る工程と、チタネートカップリング剤又はアルミニウムカップリング剤から選択される疎水化剤を無機粉末に混合し粉砕して、着色磁粉の平均粒径よりはるかに小さい平均粒径１μｍ以下の疎水性無機粉末を作成する工程と、１〜５重量パーセントの疎水性無機粉末を着色磁粉に混合して磁粉探傷用乾式磁粉を作る工程とを含む。
着色磁粉に疎水性の無機粉末を混合して疎水性無機粉末を着色磁粉間に均一に分散するので、着色磁粉の粘着性を減少し、着色磁粉の流動性を向上できる。これにより、流動性のよい磁粉探傷用乾式磁粉を被検査材表面に均一に散布できる。また、磁粉探傷用乾式磁粉を散布後、欠陥部に形成された磁粉模様以外に被検査材表面に分散した磁粉探傷用乾式磁粉を容易に除去できる。
【０００６】
【発明の実施の形態】
以下、この発明による磁粉探傷用乾式磁粉の製法の実施の形態を説明する。
この発明による磁粉探傷用乾式磁粉の製法は、まず公知の方法で結着剤、着色材、磁性粉末を混合して混合物を作り、この混合物を十分に混練した後、乾燥し、粉砕して着色磁粉を作る。着色磁粉は結着材、着色材及び磁性粉末を溶媒に均一に分散混合した磁粉混合液をスプレー装置で噴霧、乾燥して製造することもできる。また、無機粉末と疎水化剤を混合し粉砕した平均粒径１μｍ以下の疎水性無機粉末とを作る。無機粉末は、ベントナイト、ケイ酸、珪藻土、アルミナ、炭酸カルシウム、炭酸マグネシウム、炭酸バリウム、酸化マグネシウム、酸化亜鉛、タルク、カオリン、ホウ酸、水酸化アルミニウム、水酸化マグネシウム等の粉末である。疎水化剤は、チタネートカップリング剤、プレンアクトＫＲ（商標名／味の素株式会社製）、アルミニウムカップリング剤、アルミキレートＭ（商標名／川口ファインケミカル株式会社製）、アルミキレートＤ（商標名／川口ファインケミカル株式会社製）である。着色磁粉に１〜５重量パーセントの疎水性無機粉末を混合して磁粉探傷用乾式磁粉を作る。疎水性無機粉末が１重量パーセント未満であると、着色磁粉の流動性を向上し、粘着性を減少できない。また、５重量パーセントより多く混合しても着色磁粉の流動性は変わらないため、最小量の５重量パーセントで十分である。
【０００７】
着色磁粉に疎水性の無機粉末を混合するので、粉末粒子間に水分を吸着せず、また、疎水性無機粉末の平均粒径１μｍ以下は着色磁粉の平均粒径よりはるかに小さいので、微量の疎水性無機粉末でも着色磁粉間に均一に分散でき、着色磁粉の流動性を向上できる。従って、流動性のよい磁粉探傷用乾式磁粉を被検査材表面に均一に散布できる。また、磁粉探傷用乾式磁粉を散布後、欠陥部に形成された磁粉模様以外に被検査材表面に分散した磁粉探傷用乾式磁粉を容易に除去できる。
【０００８】
【実施例】
［例１］
重量基準で、平均粒径１０μｍのステンレススチール粉８８部、チタン白５部、フェノール樹脂５部、アセトン１部、メタノール１部を混合して十分に混練した後乾燥し、粉砕して平均粒径１５μｍの白色の着色磁粉を得た。一方、ケイ酸８５部、アルミニウムカップリング剤、アルミキレートＭ５部、トリクロロエチレン１０部をよく混合し、１１０℃で１時間乾燥処理した後、解砕して疎水性のケイ酸粉末を得た。次に、着色磁粉１００部に、疎水性ケイ酸粉末５部をＶ型ミキサーで、１５分混合し白色の磁粉探傷用乾式磁粉を得た。
【０００９】
白色の磁粉探傷用乾式磁粉を圧縮空気を用いた磁粉散布器で空気中に分散させ、周知の交流磁化極間型装置で磁化した被検査材表面に散布し、被検査材を軽く振動すると、被検査材表面の欠陥部に白色の磁粉模様がコントラストよく明確に得られた。
【００１０】
【発明の効果】
前記のように、この発明による磁粉探傷用乾式磁粉の製法は、着色磁粉の流動性を向上しかつ粘着性を減少して、流動性のよい磁粉探傷用乾式磁粉を被検査材の表面に均一に散布できると共に、欠陥部以外の余分な着色磁粉を容易に除去できるので探傷工程に要する時間を短縮することができる。また、被検査物の表面に磁性粉末が付着したとき、着色材が磁性粉末から剥離せずかつ磁粉の色調及び輝度が損なわれずに、被検査物の欠陥部を明確に表示できるので、確実に探傷を行うことができる。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a dry magnetic powder used in a magnetic particle flaw detection method, and more particularly to a method for producing a dry magnetic powder for flaw detection with improved fluidity and reduced adhesion.
[0002]
[Prior art]
A magnetic particle flaw detection method that detects discontinuities such as cracks and pinholes existing on or near the surface of a ferromagnetic material such as a steel material and magnetic alloy steel is a non-destructive test. That is, when a magnetizing current is passed through a steel material to be inspected such as a square billet or a round billet by a magnetic particle flaw detector, the magnetic resistance of the defective portion becomes larger than the other portions, and the magnetic flux leaks into the air only in the defective portion. When magnetic powder made of fine ferromagnetic powder is dispersed on the surface of the magnetized material to be inspected, the magnetic powder adheres to the defect due to the magnetic strain generated in the defect, and the adhering magnetic powder is linear, circular and dispersed. A magnetic powder pattern is formed to display defective portions of the material to be inspected. The method of spraying magnetic powder to detect defects on the surface of the material to be inspected is a dry method in which dried magnetic powder is dispersed in a gas and sprayed, and the magnetic powder is dispersed and suspended in an appropriate liquid such as water. Broadly divided into wet methods. The defective portion displayed by the magnetic powder is removed by grinding using a grinder such as a grinder.
In the magnetic particle flaw detection method, the magnetic particles are only mechanically attached to the defects on the surface of the material to be inspected by a weak magnetic force. When moving and applying vibration, the magnetic powder immediately drops off from the surface of the material to be inspected and the magnetic powder pattern disappears. Even if the remanent magnetism of the material to be inspected is relatively large, it can be easily peeled off by contact with other objects or by hand. Therefore, the magnetic powder pattern that indicates the defective part of the material to be inspected is securely fixed on the surface of the material to be inspected, so that the magnetic powder adhering to the surface of the defective part is prevented from coming off and forming a clearer magnetic powder pattern. It is necessary to clearly indicate the minute defect portion.
Conventionally, a colored magnetic powder adhered to the surface of a thermoplastic substance colored with a pigment or dye is dispersed on the magnetized material to be inspected, and after forming a magnetic powder pattern on the surface of the inspected material, the melting point of the thermoplastic material is exceeded. The material to be inspected is heated, and the thermoplastic substance is melted and cured to fix the magnetic powder pattern to the material to be inspected, thereby improving the degree of discrimination of the magnetic powder pattern.
[0003]
A conventional method for producing colored magnetic powder is, for example, sufficiently mixing magnetic powder such as iron powder and iron oxide powder, a dye or pigment, a thermoplastic material such as a synthetic resin, and a solvent that dissolves the thermoplastic material, Knead. The thermoplastic substance dissolved in the solvent becomes a binder, and a dye or pigment is attached to the magnetic powder. Next, after drying the mixture into a solid mass, it is pulverized to the required particle size and sieved. The average particle size of the magnetic powder is approximately 15 μm, and the maximum average particle size is approximately 60 μm.
The conventional colored magnetic powder has poor fluidity because the maximum particle size is as small as about 60 μm, and when dispersed on the magnetized material to be dispersed and magnetized in a magnetic powder spreader using compressed air, the colored magnetic powder is uniform. Difficult to disperse. In addition, because it contains a thermoplastic substance and is sticky, after sprinkling colored magnetic powder, lightly vibrate the material to be inspected, or blow a quiet air flow to disturb the magnetic powder pattern, and remove extra colored magnetic powder other than the magnetic powder pattern. It is difficult to remove it sufficiently. For this reason, there is a drawback that the degree of discrimination other than the magnetic powder pattern and the magnetic powder pattern is lowered, and the defective portion cannot be clearly indicated.
[0004]
[Problems to be solved by the invention]
For example, as shown in Japanese Examined Patent Publication No. 55-47815, 4 to 10 weight percent of colored magnetic powder is uniformly mixed with a lubricant powder having an average particle diameter of 1 to 590 μm, and the fluidity and adhesiveness of the dry magnetic powder. It is known to improve. The lubricant powder mixed with the magnetic powder is a silica-based powder, talc, stearic acid, sodium stearate, magnesium stearate, calcium stearate, boric acid, magnesium oxide, sodium benzoate, or glass beads.
However, silica-based powder, talc, boric acid, magnesium oxide, and glass beads are not hydrophobic, so that a small amount of water adhering to the surface of the powder obstructs the fluidity of the colored magnetic powder. In addition, the stearic acid, sodium stearate, magnesium stearate, calcium stearate, and sodium benzoate powders actually have an average particle size of 5 μm or more and have an angular crystal shape, which reduces the fluidity of the colored magnetic powder.
Therefore, the present invention provides a method for producing a dry magnetic powder for flaw detection, which can improve the fluidity of the colored magnetic powder, can be uniformly dispersed on the surface of the material to be inspected, and can easily remove the colored magnetic powder other than the magnetic powder pattern. Objective.
[0005]
[Means for Solving the Problems]
The method for producing a dry magnetic powder for flaw detection according to the present invention comprises a step of producing a colored magnetic powder containing a binder, a coloring material and a magnetic powder, and a hydrophobizing agent selected from a titanate coupling agent or an aluminum coupling agent as an inorganic powder. Mixing and pulverizing to produce a hydrophobic inorganic powder having an average particle size of 1 μm or less, which is much smaller than the average particle size of the colored magnetic powder, and mixing 1 to 5 weight percent of the hydrophobic inorganic powder with the colored magnetic powder Producing a dry magnetic powder for flaw detection.
Since the hydrophobic inorganic powder is mixed with the colored magnetic powder and the hydrophobic inorganic powder is uniformly dispersed between the colored magnetic powders, the adhesion of the colored magnetic powder can be reduced and the fluidity of the colored magnetic powder can be improved. Thereby, the dry magnetic powder for flaw detection with good fluidity can be uniformly sprayed on the surface of the material to be inspected. Moreover, after spraying the magnetic powder flaw detection dry magnetic powder, the magnetic powder flaw detection dry magnetic powder dispersed on the surface of the material to be inspected can be easily removed in addition to the magnetic powder pattern formed on the defect portion.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of a method for producing a dry magnetic powder for flaw detection according to the present invention will be described.
According to the present invention, a dry magnetic powder for flaw detection is first prepared by mixing a binder, a colorant, and magnetic powder by a known method, sufficiently kneading the mixture, drying, pulverizing and coloring. Make magnetic powder. The colored magnetic powder can also be produced by spraying and drying a magnetic powder mixed solution obtained by uniformly dispersing and mixing a binder, a coloring material and magnetic powder in a solvent with a spray device. Moreover, the inorganic powder and the hydrophobizing agent are mixed and pulverized to produce a hydrophobic inorganic powder having an average particle size of 1 μm or less. The inorganic powder is a powder of bentonite, silicic acid, diatomaceous earth, alumina, calcium carbonate, magnesium carbonate, barium carbonate, magnesium oxide, zinc oxide, talc, kaolin, boric acid, aluminum hydroxide, magnesium hydroxide or the like. Hydrophobizing agents include titanate coupling agent, preneact KR (trade name / manufactured by Ajinomoto Co., Inc.), aluminum coupling agent, aluminum chelate M (trade name / manufactured by Kawaguchi Fine Chemical Co., Ltd.), aluminum chelate D (trade name / Kawaguchi Fine Chemical Co., Ltd.) Made by Co., Ltd.). 1-5 weight percent of hydrophobic inorganic powder is mixed with the colored magnetic powder to make dry magnetic powder for magnetic particle flaw detection. When the hydrophobic inorganic powder is less than 1 weight percent, the fluidity of the colored magnetic powder is improved and the tackiness cannot be reduced. Further, even if the amount is more than 5 weight percent, the fluidity of the colored magnetic powder does not change, so the minimum amount of 5 weight percent is sufficient.
[0007]
Since the hydrophobic inorganic powder is mixed with the colored magnetic powder, moisture is not adsorbed between the powder particles, and the average particle size of 1 μm or less of the hydrophobic inorganic powder is much smaller than the average particle size of the colored magnetic powder. Even the hydrophobic inorganic powder can be uniformly dispersed between the colored magnetic powders, and the fluidity of the colored magnetic powders can be improved. Therefore, the dry magnetic powder for flaw detection with good fluidity can be uniformly dispersed on the surface of the material to be inspected. Moreover, after spraying the magnetic powder flaw detection dry magnetic powder, the magnetic powder flaw detection dry magnetic powder dispersed on the surface of the material to be inspected can be easily removed in addition to the magnetic powder pattern formed on the defect portion.
[0008]
【Example】
[Example 1]
On a weight basis, 88 parts of stainless steel powder with an average particle diameter of 10 μm, 5 parts of titanium white, 5 parts of phenol resin, 1 part of acetone, and 1 part of methanol are mixed together, dried, pulverized and averaged 15 μm of white colored magnetic powder was obtained. On the other hand, 85 parts of silicic acid, aluminum coupling agent, 5 parts of aluminum chelate M, and 10 parts of trichlorethylene were mixed well, dried at 110 ° C. for 1 hour, and then crushed to obtain hydrophobic silicic acid powder. Next, 100 parts of colored magnetic powder and 5 parts of hydrophobic silicic acid powder were mixed with a V-type mixer for 15 minutes to obtain white dry magnetic powder for flaw detection.
[0009]
When white magnetic powder flaw detection dry magnetic powder is dispersed in the air with a magnetic powder spreader using compressed air, sprayed on the surface of the material to be inspected magnetized with a known alternating current magnet type device, and when the material to be inspected is vibrated lightly, A white magnetic powder pattern was clearly obtained with good contrast at the defect portion on the surface of the material to be inspected.
[0010]
【The invention's effect】
As described above, the method for producing a dry magnetic powder for flaw detection according to the present invention improves the fluidity of the colored magnetic powder and reduces the stickiness so that the magnetic powder flaw detection dry magnetic powder is uniformly applied to the surface of the material to be inspected. In addition, it is possible to easily remove the extra colored magnetic powder other than the defective portion, and thus the time required for the flaw detection process can be shortened. In addition, when the magnetic powder adheres to the surface of the object to be inspected, the colorant does not peel from the magnetic powder and the color tone and brightness of the magnetic powder are not impaired, so that the defective part of the object to be inspected can be clearly displayed, so Can perform flaw detection.
Claims (2)
チタネートカップリング剤又はアルミニウムカップリング剤から選択される疎水化剤を無機粉末に混合し粉砕して、着色磁粉の平均粒径よりはるかに小さい平均粒径１μｍ以下の疎水性無機粉末を作成する工程と、
１〜５重量パーセントの疎水性無機粉末を着色磁粉に混合して磁粉探傷用乾式磁粉を作る工程とを含むことを特徴とする磁粉探傷用乾式磁粉の製法。Producing a colored magnetic powder comprising a binder, a colorant and magnetic powder;
A step of mixing a hydrophobizing agent selected from a titanate coupling agent or an aluminum coupling agent into an inorganic powder and pulverizing to produce a hydrophobic inorganic powder having an average particle size of 1 μm or less, which is much smaller than the average particle size of the colored magnetic powder When,
And 1-5 weight percent of hydrophobic inorganic powder mixed with colored magnetic powder to produce dry magnetic powder for magnetic particle testing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP01070297A JP3869510B2 (en) | 1997-01-23 | 1997-01-23 | Production of dry magnetic powder for flaw detection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP01070297A JP3869510B2 (en) | 1997-01-23 | 1997-01-23 | Production of dry magnetic powder for flaw detection |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10206347A JPH10206347A (en) | 1998-08-07 |
| JP3869510B2 true JP3869510B2 (en) | 2007-01-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP01070297A Expired - Fee Related JP3869510B2 (en) | 1997-01-23 | 1997-01-23 | Production of dry magnetic powder for flaw detection |
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| Country | Link |
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| JP (1) | JP3869510B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4521648B2 (en) * | 2000-07-27 | 2010-08-11 | マークテック株式会社 | Manufacturing method of fluorescent powder for magnetic particle testing |
| JP3908631B2 (en) * | 2002-09-04 | 2007-04-25 | 住友金属工業株式会社 | Fluorescent magnetic powder for magnetic particle testing |
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1997
- 1997-01-23 JP JP01070297A patent/JP3869510B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH10206347A (en) | 1998-08-07 |
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