JPH061261B2 - Evaluation equipment for low permeability pipe - Google Patents
Evaluation equipment for low permeability pipeInfo
- Publication number
- JPH061261B2 JPH061261B2 JP59176035A JP17603584A JPH061261B2 JP H061261 B2 JPH061261 B2 JP H061261B2 JP 59176035 A JP59176035 A JP 59176035A JP 17603584 A JP17603584 A JP 17603584A JP H061261 B2 JPH061261 B2 JP H061261B2
- Authority
- JP
- Japan
- Prior art keywords
- pipe
- magnetic
- under test
- differential
- magnetic sensor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
Description
【発明の詳細な説明】 （イ）産業上の利用分野 この発明は、低透磁率材パイプ、例えば原子力機器等で
使用される高品質のステンレス鋼管（ＳＵＳパイプ）を
試験評価するのに使用される評価装置に関する。DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application This invention is used for testing and evaluating low-permeability material pipes, for example, high-quality stainless steel pipes (SUS pipes) used in nuclear equipment and the like. Evaluation device.
（ロ）従来の技術 原子力機器に使用される一定の肉厚を有するＳＵＳパイ
プは、組成が一様でないと３、腐食が発生するため、組
成の一様、均一なものが不可欠となる。ＳＵＳ材を組成
に分類すると、フェライト系、マルテンサイト系、オー
ステナイト系があり、例えばオーステナイト系（Fe、N
i、Cr系）を常温、低温で加工すると一部マルテンサイ
ト系に変態し、磁性を帯びるようになる。したがって、
非常に安定した熱処理及び加工が要求され、もし、組成
に一様でない部分があると不良であるとし、上記した原
子力機器等には使用できない。(B) Conventional technology A SUS pipe having a constant wall thickness used in nuclear equipment has a non-uniform composition 3, and corrosion occurs. Therefore, a uniform and uniform composition is essential. When SUS materials are classified into compositions, there are ferrite type, martensite type, and austenite type. For example, austenite type (Fe, N
(i, Cr-based) is partly transformed to martensite-based when it is processed at room temperature and low temperature and becomes magnetized. Therefore,
Extremely stable heat treatment and processing are required, and if there is a portion where the composition is not uniform, it is considered to be defective, and it cannot be used for the above-mentioned nuclear equipment.
組成の一様でない部分は、鋼材分野で、ホットポイント
（ＨｏｔＰｏｉｎｔ）と呼ばれているが、このホットポ
イントを非破壊で、簡易に抽出する装置は、これまでに
なかった。A portion having a non-uniform composition is called a hot point in the field of steel materials, but there has been no apparatus for extracting the hot point in a non-destructive and easy manner.
（ハ）目的 この発明の目的は上記に鑑み、ＳＵＳパイプ等の低透磁
率材パイプの組成の一様性、均一性を非破壊で簡単に確
認し得る低透磁率材パイプの評価装置を提供することで
ある。(C) Objective In view of the above, an object of the present invention is to provide a low-permeability material pipe evaluation apparatus capable of easily and nondestructively confirming the composition and uniformity of the composition of a low-permeability material pipe such as a SUS pipe. It is to be.
（ニ）構成 上記目的を達成するために、この発明は組成が一様でな
い部分を磁気的異常点（ＭａｇｎｅｔｉｃＡｎｏｍａｌ
ｙＰｏｉｎｔ）として検知するようにしている。すなわ
ち、低透磁材の被試験パイプの筒軸方向に沿って設けら
れる差動形磁気センサと、前記被試験パイプの筒軸方向
及び前記差動形磁気センサの検知軸に直交する方向に磁
界を印加する磁界付与手段と、前記被試験パイプの筒内
部に挿着され、外周面に被試験パイプを軸方向及び周方
向に移動自在に保持するローラを備えるもに、少なくと
も前記差動形磁気センサを装着したブロックとからな
り、前記差動形磁気センサの磁気検知出力により前記被
試験パイプの品質を評価している。磁気出力として一定
の磁気モーメントあるいは低透磁率が検出された場合、
その材料は不良品であると評価する。(D) Structure In order to achieve the above-mentioned object, the present invention makes a magnetic abnormal point (MagneticAnomal
It is detected as yPoint). That is, the differential magnetic sensor provided along the cylinder axis direction of the pipe under test of the low magnetic permeability material, and the magnetic field in the cylinder axis direction of the pipe under test and the direction orthogonal to the detection axis of the differential magnetic sensor. At least the differential magnetic field And a block on which a sensor is mounted, and the quality of the pipe under test is evaluated by the magnetic detection output of the differential magnetic sensor. If a constant magnetic moment or low permeability is detected as the magnetic output,
The material is evaluated as defective.
（ホ）実施例 第３図に示すように、磁界Ho中に、比透磁率μｓ（＝１
＋Ｘ／μｏ）、〔Ｘ：帯磁率、μｏ＝４π×１０−７〕
の材料Ｐを置くと、 Ｍ＝ＳＬμｏ（Ｘ／μｏ）Ｈｏ／（１＋ＮＸ／μｏ）
（ｗｂ−ｍ） の磁気モーメントが発生する。(E) Example As shown in FIG. 3, the relative magnetic permeability μs (= 1
+ X / μo), [X: magnetic susceptibility, μo = 4π × 10- 7]
Putting the material P of, M = SL μo (X / μo) Ho / (1 + NX / μo)
A magnetic moment of (wb-m) is generated.
ここでＮは減磁係数であって、形状により異なる。Ｓは
材料Ｐの断面積、Ｌはその長さである。ＮＸ／μｏ＜＜
１のときは、磁気モーメントＭはＭ≒ＸＨｏ・ＳＬ（ｗ
ｂ−ｍ） となる。そしてこの試料Ｐから磁界Ｈが発生し、この磁
界Ｈは、与えた磁界Ｈｏを直交する。また上式より、磁
界Ｈは比透磁率μｓ中の帯磁率Ｘに比例することが判
る。Here, N is a demagnetization coefficient, which differs depending on the shape. S is the cross-sectional area of the material P and L is its length. NX / μo <<
When 1, the magnetic moment M is M≈XHo · SL (w
b-m). A magnetic field H is generated from this sample P, and this magnetic field H is orthogonal to the applied magnetic field Ho. Further, from the above equation, it is understood that the magnetic field H is proportional to the magnetic susceptibility X in the relative magnetic permeability μs.
第１図はこの発明の１実施例を示す評価装置の側面図で
ある。FIG. 1 is a side view of an evaluation device showing an embodiment of the present invention.
試験すべき材料はステンレス鋼のパイプ１であり、永久
磁石２からの強力磁界がヨーク３を経て、ステンレス鋼
パイプ１の直径方向に印加されるようになっている。The material to be tested is a stainless steel pipe 1, and a strong magnetic field from a permanent magnet 2 is applied to the stainless steel pipe 1 through the yoke 3 in the radial direction.
また、パイプ１の筒内には強力磁界が加えられる位置
に、パイプ１の軸に平行に差動形の磁気センサ４が配列
されている。Further, a differential type magnetic sensor 4 is arranged in parallel with the axis of the pipe 1 at a position where a strong magnetic field is applied in the cylinder of the pipe 1.
パイプ１は、ブロック５によって保持され、ブロック５
の円周部にローラ６・７・８が設けられ、このローラ６
・７・８によりパイプ１は円周方向と、紙面の表裏方向
に移動自在に構成されている。Pipe 1 is held by block 5, block 5
Rollers 6, 7, and 8 are provided on the circumference of the roller 6.
The pipe 1 is configured to be movable in the circumferential direction and the front and back directions of the paper surface by 7 and 8.
第２図は差動形の磁気センサ（フラックスゲート）４の
側面図である。この装置は差動形の磁気センサを用いて
いるので地磁気等、外乱ノイズに強いという利点があ
る。FIG. 2 is a side view of the differential type magnetic sensor (flux gate) 4. Since this device uses a differential type magnetic sensor, it has an advantage of being strong against disturbance noise such as geomagnetism.
この実施例装置において、パイプ１を円周方向に回転さ
せながら、紙面の表から裏に向けて進行させ、永久磁石
１からパイプ１に強力磁界Ｈｏを連続的に印加すると、
差動形の磁気センサ４により、磁気モーメントＭを検出
することにより、パイプ１の透磁率の変化を測定でき
る。もし、パイプ１の組成が変化していると、応じてそ
の点における磁気センサ４の出力も変化するので、その
出力の変化度合により、パイプ１良否を判定できる。In the apparatus of this embodiment, while rotating the pipe 1 in the circumferential direction, the pipe 1 is advanced from the front side to the back side of the paper surface and the strong magnetic field Ho is continuously applied from the permanent magnet 1 to the pipe 1,
By detecting the magnetic moment M with the differential magnetic sensor 4, the change in the magnetic permeability of the pipe 1 can be measured. If the composition of the pipe 1 changes, the output of the magnetic sensor 4 at that point also changes, so that the quality of the pipe 1 can be determined by the degree of change in the output.
なお上記実施例装置に、ロータリエンコーダや、スケー
ラを設け、これらロータリエンコーダ、スケーラの位置
信号と、磁気センサ４の出力を記録計に描かせる他、メ
モリに記憶し、ＣＰＵ処理すれば、そのパイプ１の非常
に厳密な磁気的変化特性を得ることができる。The apparatus of the above embodiment is provided with a rotary encoder and a scaler, and the position signals of the rotary encoder and the scaler and the output of the magnetic sensor 4 can be drawn on the recorder, and if they are stored in the memory and processed by the CPU, the pipes are stored. A very strict magnetic change characteristic of 1 can be obtained.
また、上記実施例では、永久磁石２を、パイプ１の筒外
に設けているが、第１図の破線で示すように、永久磁石
２’をパイプ１の筒内に設けてもよい。このようにすれ
ば、磁気センサ４と永久磁石２’の位置関係が固定され
て、磁気センサ４の出力が安定する。Further, in the above embodiment, the permanent magnet 2 is provided outside the cylinder of the pipe 1, but the permanent magnet 2 ′ may be provided inside the cylinder of the pipe 1 as shown by the broken line in FIG. By doing so, the positional relationship between the magnetic sensor 4 and the permanent magnet 2'is fixed, and the output of the magnetic sensor 4 is stabilized.
また、上記実施例では、パイプ１等に磁界を加えるの
に、永久磁石を使用しているが、これに代えて電磁石を
用いてもよい。これにより、任意の強さの磁界Ｈｏを得
ることができるとともに交番磁界による帯磁率Ｘを求め
ることも可能となる。Further, in the above embodiment, the permanent magnet is used to apply the magnetic field to the pipe 1 or the like, but an electromagnet may be used instead of the permanent magnet. Thereby, it is possible to obtain the magnetic field Ho having an arbitrary strength and also to obtain the susceptibility X due to the alternating magnetic field.
また、上記実施例では差動形の磁気センサ４を１個使用
しているが、第１図の破線で示すように複数個の磁気セ
ンサ４’、４’を設けてもよい。これにより多くの情報
を一度に得ることができる。この場合は、磁石の磁界鎖
交をさけるため、パイプ１の軸に平行な方向に位置をず
らせて配列することになる。Further, although one differential type magnetic sensor 4 is used in the above embodiment, a plurality of magnetic sensors 4 ', 4'may be provided as shown by the broken line in FIG. This makes it possible to obtain a lot of information at once. In this case, in order to avoid the magnetic field linkage of the magnets, the magnets are arranged with their positions displaced in the direction parallel to the axis of the pipe 1.
（ヘ）効果 この発明によれば、磁気的な検出により、材料の組成変
化を検出するものであるから、計測を迅速かつ正確に行
うことができる。また非破壊検査が可能であり、非試験
材からサンプルの取り出しによる形成加工等は不要であ
るから、それにともなう熱歪等による状態変化は何ら心
配する必要がない。また、ブロックに設けたローラによ
り、被試験パイプを軸方向及び周方向に容易に移動で
き、被試験パイプの全体を容易に漏れなく、検査するこ
とができる。(F) Effect According to the present invention, since the composition change of the material is detected by magnetic detection, the measurement can be performed quickly and accurately. Further, since nondestructive inspection is possible and formation processing etc. by taking out a sample from a non-test material is unnecessary, there is no need to worry about the state change due to the thermal strain or the like. In addition, the roller provided in the block allows the pipe under test to be easily moved in the axial direction and the circumferential direction, so that the entire pipe under test can be easily inspected without leakage.
第１図はこの発明の１実施例を示すパイプの評価装置の
正面図、第２図は同評価装置に使用される磁気センサの
側面図、第３図は同装置の採用原理を説明するための図
である。 １：パイプ、 ２：永久磁石、 ３：ヨーク、 ４：差動形の磁気センサ ５：ブロック、 ６・７・８：ローラ1 is a front view of a pipe evaluation apparatus showing an embodiment of the present invention, FIG. 2 is a side view of a magnetic sensor used in the evaluation apparatus, and FIG. 3 is a view for explaining the principle of adoption of the apparatus. FIG. 1: Pipe, 2: Permanent magnet, 3: Yoke, 4: Differential type magnetic sensor 5: Block, 6.7.8: Roller
Claims (1)
て設けられる差動形磁気センサと、前記被試験パイプの
筒軸方向及び前記差動形磁気センサの検知軸に直交する
方向に磁界を印加する磁界付与手段と、前記被試験パイ
プの筒内部に挿着され、外周面に被試験パイプを軸方向
及び周方向に移動自在に保持するローラを備えるととも
に、少なくとも前記差動形磁気センサを装着したブロッ
クとからなり、前記差動形磁気センサの磁気検知出力に
より、前記被試験パイプの品質を評価することを特徴と
する低透磁率材パイプの評価装置。1. A differential magnetic sensor provided along a cylinder axis direction of a pipe under test made of a low magnetic permeability material, and a cylinder axis direction of the pipe under test and a detection axis of the differential magnetic sensor. A magnetic field applying means for applying a magnetic field in a direction, and a roller that is inserted into the inside of the pipe of the pipe under test and holds the pipe under test movably in the axial direction and the circumferential direction, and at least the differential And a block to which a shape-type magnetic sensor is mounted, and the quality of the pipe under test is evaluated by the magnetic detection output of the differential-type magnetic sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59176035A JPH061261B2 (en) | 1984-08-23 | 1984-08-23 | Evaluation equipment for low permeability pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59176035A JPH061261B2 (en) | 1984-08-23 | 1984-08-23 | Evaluation equipment for low permeability pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6153561A JPS6153561A (en) | 1986-03-17 |
| JPH061261B2 true JPH061261B2 (en) | 1994-01-05 |
Family
ID=16006582
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59176035A Expired - Lifetime JPH061261B2 (en) | 1984-08-23 | 1984-08-23 | Evaluation equipment for low permeability pipe |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH061261B2 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2705067B2 (en) * | 1987-06-12 | 1998-01-26 | 松下電器産業株式会社 | Magnetic susceptibility distribution measurement device |
| JPH02120658A (en) * | 1988-10-31 | 1990-05-08 | Nippon Yakin Kogyo Co Ltd | Method for inspecting liquid phase sintered alloy having magnetic base phase |
| JPH072620U (en) * | 1993-06-10 | 1995-01-13 | 貴 高橋 | Screw receiver |
| JP3547334B2 (en) * | 1999-02-24 | 2004-07-28 | 株式会社日立ビルシステム | Magnetic flaw detector for elevator ropes |
| JP7073842B2 (en) * | 2018-03-28 | 2022-05-24 | 住友金属鉱山株式会社 | Composition determination method, composition determination device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5420759A (en) * | 1977-07-15 | 1979-02-16 | Shimadzu Corp | Metal detector |
-
1984
- 1984-08-23 JP JP59176035A patent/JPH061261B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6153561A (en) | 1986-03-17 |
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