JPH0722240A - Magnetization system for steel plate - Google Patents
Magnetization system for steel plateInfo
- Publication number
- JPH0722240A JPH0722240A JP16692893A JP16692893A JPH0722240A JP H0722240 A JPH0722240 A JP H0722240A JP 16692893 A JP16692893 A JP 16692893A JP 16692893 A JP16692893 A JP 16692893A JP H0722240 A JPH0722240 A JP H0722240A
- Authority
- JP
- Japan
- Prior art keywords
- steel plate
- magnetic
- poles
- steel sheet
- magnetized
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、搬送ラインに沿って走
行する鋼板の漏洩磁束法による欠陥検査に際し、検査対
象となる鋼板を連続的に磁化する装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for continuously magnetizing a steel sheet to be inspected during a defect inspection of a steel sheet traveling along a conveyor line by a leakage flux method.
【０００２】[0002]
【従来の技術】自動車のボディ用鋼板等、巨大産業の基
盤材料となる鋼板の製造においては、毎秒数メートルの
速度を有して所定の搬送ライン上を走行する鋼板の表面
欠陥をオンラインにて検出することが要求され、この要
求に応え得る欠陥検査法として漏洩磁束法が広く採用さ
れている。この方法は、走行中の鋼板を連続的に磁化す
る一方、該鋼板の表面に臨ませて磁気センサを配し、欠
陥の存在部位での局所的な漏洩磁束を捉える方法であ
る。2. Description of the Related Art In the manufacture of steel sheets for automobiles, such as steel sheets for automobile bodies, which is a basic material for a huge industry, surface defects of steel sheets traveling on a predetermined conveying line at a speed of several meters per second are online. Detecting is required, and the leakage magnetic flux method is widely adopted as a defect inspection method that can meet this requirement. This method is a method in which a running steel plate is continuously magnetized, and a magnetic sensor is arranged so as to face the surface of the steel plate to capture a local leakage magnetic flux at a defect existing portion.
【０００３】以上の如き漏洩磁束法の実施に際しては、
検査対象となる鋼板を磁化するために、搬送ラインに沿
って走行する前記鋼板の幅方向両側縁に夫々臨ませて継
鉄により接続された一対の磁極を配し、これら夫々に巻
回された磁化コイルへの通電により、一方の磁極をＮ極
に、他方の磁極をＳ極に帯磁して、両磁極間に形成され
る磁界の作用により前記鋼板を連続的に磁化する構成と
した磁化装置が用いられている。In carrying out the above-mentioned magnetic flux leakage method,
In order to magnetize the steel sheet to be inspected, a pair of magnetic poles, which are connected to each other by yokes, are arranged so as to face both side edges in the width direction of the steel sheet traveling along the conveyance line, and are wound around each of these. A magnetizing device configured to magnetize one magnetic pole to an N pole and the other magnetic pole to an S pole by energizing a magnetizing coil and continuously magnetize the steel sheet by the action of a magnetic field formed between the magnetic poles. Is used.
【０００４】[0004]
【発明が解決しようとする課題】さて、漏洩磁束法によ
る検査精度の向上のためには、検査対象となる鋼板が、
幅方向の全域に亘って磁気飽和に至るまで均等に磁化さ
れることが重要である。ところが、前述した如き構成の
従来の磁化装置を用いた場合、一方の側縁に臨ませた磁
極（Ｎ極）から他方の側縁に臨ませた磁極（Ｓ極）に向
かう磁束が両者の中間において広がることから、鋼板内
部の磁束密度が幅方向中央において低くなり、特に、１
〜２ｍにも達する広幅の鋼板を検査対象とする場合、該
鋼板の全幅に亘る均等な磁化が難しく、磁気飽和に至っ
ていない中央部分では漏洩磁束の確実な検出ができず
に、欠陥の存否が誤って検出される虞があった。In order to improve the inspection accuracy by the leakage magnetic flux method, the steel sheet to be inspected is
It is important that the entire region in the width direction is uniformly magnetized to reach magnetic saturation. However, when the conventional magnetizing device having the above-mentioned structure is used, the magnetic flux from the magnetic pole (N pole) facing one side edge to the magnetic pole (S pole) facing the other side edge is intermediate between the two. , The magnetic flux density inside the steel sheet decreases in the widthwise center, and
When a wide steel plate reaching up to ~ 2 m is to be inspected, it is difficult to evenly magnetize the entire width of the steel plate, and it is impossible to reliably detect the leakage magnetic flux in the central portion where magnetic saturation is not reached. There was a risk that it would be erroneously detected.
【０００５】この難点を解消すべく、特開昭50−138399
号公報には、検査対象となる鋼板の一面に転接するロー
ラにこれの軸心上の継鉄により接続された一対の磁極を
組み込み、これらの磁極がローラの外側を覆う薄肉の非
磁性板を介して鋼板に接触するようになし、該鋼板を一
部に含む磁気的な閉回路を形成することにより、鋼板内
部の磁化態様の均等化を図った磁化装置が開示されてい
る。In order to solve this difficulty, Japanese Patent Laid-Open No. 138399/1975
In the gazette, a pair of magnetic poles connected to each other by a yoke on its axis is incorporated in a roller rolling on one surface of a steel sheet to be inspected, and a thin non-magnetic plate which these magnetic poles cover the outside of the roller. There is disclosed a magnetizing device in which a magnetic closed circuit including a part of the steel plate is formed so as to be in contact with the steel plate through the magnetizing device so as to equalize the magnetization modes inside the steel plate.
【０００６】ところがこの構成においては、前記ローラ
と共に回転する磁極を帯磁せしめるために、ローラの回
転軸に付設したスリップリングを介しての給電を要し、
給電構造の複雑化が避け難い上、この構造部分での故障
の発生頻度が高く、頻繁な保守点検を必要とする等、実
用性に乏しいという問題があった。更に、大なる走行速
度を有する搬送ラインにおいては、該搬送ライン上の鋼
板と前記ローラとの転接が安定して行われず、満足すべ
き検査精度が得られなくなる虞があった。However, in this structure, in order to magnetize the magnetic pole rotating with the roller, power supply is required through a slip ring attached to the rotary shaft of the roller,
It is unavoidable that the power feeding structure is complicated, the frequency of failures in this structure is high, and frequent maintenance inspections are required. Further, in a conveying line having a high traveling speed, rolling contact between the steel plate and the roller on the conveying line is not stably performed, and there is a possibility that satisfactory inspection accuracy cannot be obtained.
【０００７】本発明は斯かる事情に鑑みてなされたもの
であり、検査対象となる鋼板を幅方向の全域に亘って略
均等に磁化でき、漏洩磁束法による欠陥検査精度の安定
向上に寄与できる鋼板の磁化装置を提供することを目的
とする。The present invention has been made in view of the above circumstances, and it is possible to magnetize a steel sheet to be inspected substantially uniformly over the entire width direction and contribute to stable improvement of defect inspection accuracy by the leakage flux method. An object is to provide a magnetizing device for a steel sheet.
【０００８】[0008]
【課題を解決するための手段】本発明に係る鋼板の磁化
装置は、相異なる極性を有する一対の磁極を、搬送ライ
ンに沿って走行する鋼板の幅方向両側縁に夫々臨ませて
配し、両磁極間に形成される磁界の作用により前記鋼板
を連続的に磁化する装置において、前記両磁極の間にて
前記鋼板の一面に近接配置され、前記磁界の方向に沿う
磁気的な閉回路を形成すると共に、前記鋼板との近接部
位の断面積が他の部位のそれよりも小さく設定してある
強磁性体ヨークを具備することを特徴とする。A steel sheet magnetizing device according to the present invention has a pair of magnetic poles having different polarities, which are arranged so as to face both side edges in the width direction of a steel sheet traveling along a conveyor line. In a device for continuously magnetizing the steel sheet by the action of a magnetic field formed between both magnetic poles, a magnetic closed circuit disposed in proximity to one surface of the steel sheet between the both magnetic poles and extending along the direction of the magnetic field. It is characterized in that it is provided with a ferromagnetic yoke which is formed and whose cross-sectional area in a region close to the steel plate is set smaller than that in other regions.
【０００９】[0009]
【作用】本発明においては、検査対象となる鋼板の幅方
向両側に一対の磁極を臨ませると共に、これらによる磁
界の方向に沿って磁気的な閉回路を形成する強磁性体ヨ
ークを両磁極の間にて前記鋼板の一面に近接して配し、
両磁極の中間での磁束の広がりにより前記鋼板の中央部
に生じる磁束密度の低下を、前記閉回路の周辺に漏れ出
す磁束により補完して、鋼板の幅方向全域に亘る均等な
磁化を達成する。また前記閉回路を形成する強磁性体ヨ
ークとして、鋼板との近接部位の断面積が他の部位の断
面積よりも小さいものを用い、周辺への磁束の漏れ出し
を促進すると共に、この漏れ出し量の管理を可能とす
る。In the present invention, a pair of magnetic poles are provided on both sides of the steel sheet to be inspected in the width direction, and a ferromagnetic yoke forming a magnetic closed circuit along the direction of the magnetic field is formed between the magnetic poles. Placed close to one surface of the steel plate between,
The decrease in the magnetic flux density generated in the central portion of the steel plate due to the spread of the magnetic flux in the middle of both magnetic poles is complemented by the magnetic flux leaking to the periphery of the closed circuit, and uniform magnetization is achieved over the entire width direction of the steel plate. . Further, as the ferromagnetic yoke forming the closed circuit, one having a cross-sectional area of a portion close to the steel plate smaller than the cross-sectional area of other portions is used to promote leakage of magnetic flux to the surroundings and Allows management of quantity.
【００１０】[0010]
【実施例】以下本発明をその実施例を示す図面に基づい
て詳述する。図１は本発明に係る鋼板の磁化装置（以下
本発明装置という）の使用状態を示す模式図である。図
中１は、漏洩磁束法による欠陥検査の対象となる鋼板で
あり、該鋼板１は、紙面の表裏方向に所定の速度にて走
行している。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings showing the embodiments. FIG. 1 is a schematic view showing a usage state of a steel plate magnetizing apparatus according to the present invention (hereinafter referred to as an apparatus of the present invention). In the figure, 1 is a steel plate which is a target of defect inspection by the leakage magnetic flux method, and the steel plate 1 is running at a predetermined speed in the front-back direction of the paper.
【００１１】鋼板１の幅方向両側縁には、夫々との間に
所定の微小な間隙を隔てて一対の磁極2a，2bが臨ませて
ある。これらの磁極2a，2bは、鋼板１の下側にこれと略
平行をなして設置された継鉄３の両端に上向きに立ち上
がる態様に接続してあり、夫々の立ち上がり部に巻回さ
れた磁化コイル4a，4bへの直流電流の給電により、一方
の磁極2aがＮ極に、他方の磁極2bがＳ極に夫々帯磁され
て、鋼板１の幅方向の磁界を形成するようになしてあ
る。A pair of magnetic poles 2a and 2b are provided on both side edges of the steel sheet 1 in the width direction with a predetermined minute gap therebetween. These magnetic poles 2a and 2b are connected in a manner that they rise upward at both ends of a yoke 3 which is installed under the steel plate 1 in a substantially parallel manner, and the magnetisms wound around the rising portions of the yokes 3a and 2b. By supplying a direct current to the coils 4a and 4b, one magnetic pole 2a is magnetized to the N pole and the other magnetic pole 2b is magnetized to the S pole to form a magnetic field in the width direction of the steel plate 1.
【００１２】また鋼板１の下側には、これの幅方向を含
む図示の横断面内において前記磁極2a，2bの略中間に位
置して強磁性体ヨーク５が配してある。この強磁性体ヨ
ーク５は、矩形枠形をなし、略等しい断面積を有する他
の３辺（大面積部5b）に比して小さい断面積を有する１
辺（小面積部5a）を備えており、図示の如く、鋼板１の
下面に小面積部5aを近接させ、大面積部5bに巻回された
磁気コイル６への直流電流の給電により、前記磁極2a，
2b間に形成される磁界の方向に沿う磁気的な閉回路を形
成するようになしてある。On the lower side of the steel plate 1, a ferromagnetic material yoke 5 is arranged at a position approximately midway between the magnetic poles 2a and 2b in the illustrated horizontal cross section including the width direction thereof. The ferromagnetic yoke 5 has a rectangular frame shape, and has a smaller sectional area than the other three sides (large area portion 5b) having substantially the same sectional area.
As shown in the figure, the side (small area portion 5a) is provided, the small area portion 5a is brought close to the lower surface of the steel plate 1, and the direct current is supplied to the magnetic coil 6 wound around the large area portion 5b, thereby Magnetic pole 2a,
A magnetic closed circuit is formed along the direction of the magnetic field formed between 2b.
【００１３】以上の如く構成された本発明装置は、磁化
コイル4a，4bへの給電を行い、磁極2a（Ｎ極）と磁極2b
（Ｓ極）との間に形成される磁界の作用により、両者間
に挾まれた鋼板１を磁化すると共に、磁化コイル６への
給電を併せて行い、強磁性体ヨーク５の内部に磁気回路
を形成して用いられる。The apparatus of the present invention configured as described above supplies power to the magnetizing coils 4a and 4b, and the magnetic pole 2a (N pole) and the magnetic pole 2b.
By the action of the magnetic field formed between (S pole), the steel sheet 1 sandwiched between the two is magnetized, and the power supply to the magnetizing coil 6 is also performed, and the magnetic circuit is provided inside the ferromagnetic yoke 5. Used to form.
【００１４】磁極2a，2bは、鋼板１の両側縁に臨ませて
あり、該鋼板１の幅に相当する距離だけ離隔しているか
ら、磁極2aから磁極2bに向けて流れる磁束は、前述した
如く両者の中間部において広がり、鋼板１の幅方向中央
部では、これの内部における磁束密度が低下する。本発
明装置においては、以上の如く磁束密度の低下が生じる
鋼板１の中央部に強磁性体ヨーク５の一部が近接してお
り、この近接部位は他の部位よりも小さい断面積を有す
る小面積部5aである。一方、強磁性体ヨーク５の磁化コ
イル６への給電は、これが巻回された大面積部5bにおい
て磁気飽和が生じるような条件下にてなされていること
から、小面積部5aの周囲には、この部分での許容量を超
える磁束が定常的に漏れ出し、磁極2aから磁極2bに向か
う磁束と同向きに流れており、これらは、小面積部5aに
近接する磁性体、即ち、鋼板１の中央部に流れ込み、こ
の部分での磁束密度を増すべく作用する。Since the magnetic poles 2a and 2b face both side edges of the steel plate 1 and are separated by a distance corresponding to the width of the steel plate 1, the magnetic flux flowing from the magnetic pole 2a to the magnetic pole 2b is as described above. As described above, the magnetic flux density spreads in the intermediate portion between the two, and the magnetic flux density inside the steel sheet 1 decreases in the widthwise central portion. In the device of the present invention, a part of the ferromagnetic material yoke 5 is close to the central portion of the steel plate 1 where the magnetic flux density is reduced as described above, and this adjacent portion has a smaller cross-sectional area than other portions. The area portion 5a. On the other hand, the power supply to the magnetizing coil 6 of the ferromagnetic yoke 5 is performed under the condition that magnetic saturation occurs in the large area portion 5b around which it is wound. , The magnetic flux exceeding the allowable amount in this portion constantly leaks and flows in the same direction as the magnetic flux from the magnetic pole 2a to the magnetic pole 2b. These are magnetic bodies close to the small area portion 5a, that is, the steel plate 1 Flows into the central part of the and acts to increase the magnetic flux density in this part.
【００１５】強磁性体ヨーク５を構成する材料の飽和磁
束密度をＢ、小面積部5aの断面積をＳ、大面積部5bの断
面積をＳ0 とした場合、小面積部5aの周囲に漏れ出し、
鋼板１内に流れ込む磁束Φは、次式により見積もること
ができる。 Φ≒Ｂ（Ｓ0 −Ｓ） …（１）When the saturation magnetic flux density of the material forming the ferromagnetic yoke 5 is B, the cross-sectional area of the small area 5a is S, and the cross-sectional area of the large area 5b is S 0 , the area around the small area 5a is Leaking,
The magnetic flux Φ flowing into the steel plate 1 can be estimated by the following equation. Φ≈B (S 0 −S) (1)
【００１６】従って、鋼板１の幅に応じて定まる磁極2
a，2b間の離隔距離に基づいて、両者の中間部分での磁
束密度の低下を見積り、この低下分を補うべく前記
（１）式に従って強磁性体ヨーク５の形状を決定するこ
とにより、鋼板１の内部における磁束密度が適正な範囲
（例えば、1.5 〜２テスラ）に維持され、幅方向全域に
亘って略均等な条件下での磁化が行えるようになる。Therefore, the magnetic pole 2 determined according to the width of the steel plate 1
Based on the separation distance between a and 2b, the decrease in the magnetic flux density at the intermediate portion between the two is estimated, and the shape of the ferromagnetic yoke 5 is determined according to the equation (1) to compensate for this decrease. The magnetic flux density inside 1 is maintained in an appropriate range (for example, 1.5 to 2 Tesla), and magnetization can be performed under substantially uniform conditions over the entire width direction.
【００１７】磁極2a，2b間の磁界の作用による鋼板１内
部の磁束密度は、該鋼板１の幅方向中央部において最低
となり、両側縁に向けて徐々に増加する傾向を示す。従
って強磁性体ヨーク５の小面積部5aは、図２に示す如
く、中央において最小の断面積を有し、両側に向けて断
面積を徐々に増す形状、即ち、鋼板１内部の前述した磁
束密度の分布に合わせた形状とするのが望ましく、この
ような形状は、各部位での漏れ出し磁束Φを前記（１）
式により逐次見積もることにより決定できる。但し、図
１に示す如く、全長に亘って一定の面積を有する小面積
部5aを備えた強磁性体ヨーク５であっても実用上の差し
支えはない。The magnetic flux density inside the steel sheet 1 due to the action of the magnetic field between the magnetic poles 2a and 2b has the lowest value in the widthwise central portion of the steel sheet 1 and tends to gradually increase toward both side edges. Therefore, as shown in FIG. 2, the small area portion 5a of the ferromagnetic yoke 5 has a minimum cross-sectional area in the center and gradually increases toward both sides, that is, the above-mentioned magnetic flux inside the steel plate 1. It is desirable to have a shape that matches the density distribution, and such a shape has the leakage magnetic flux Φ at each portion as described in (1) above.
It can be determined by making successive estimations using formulas. However, as shown in FIG. 1, there is no practical problem even if the ferromagnetic yoke 5 is provided with the small area portion 5a having a constant area over the entire length.
【００１８】図３は、以上の如き構成の本発明装置にお
いて、強磁性体ヨーク５の磁化コイル６への給電を行っ
た場合と、行わなかった場合（従来の磁化装置に相当す
る）とにおいて、検査対象とした１．２ｍ幅の鋼板１の
内部における磁束密度の分布状態を比較した結果を示す
図である。FIG. 3 shows a case where power is supplied to the magnetizing coil 6 of the ferromagnetic yoke 5 in the device of the present invention having the above-described structure and a case where it is not supplied (corresponding to a conventional magnetizing device). FIG. 4 is a diagram showing a result of comparison of distribution states of magnetic flux densities inside a steel sheet 1 having a width of 1.2 m as an inspection target.
【００１９】図の横軸は、鋼板１の一側からの離隔距離
（mm）であり、縦軸は、各位置での磁束密度（Ｔ：テス
ラ）であって、また図中の○印は、磁化コイル６への給
電を行った場合の結果を、同じく●印は、前記給電を行
わなかった場合の結果を夫々示している。本図に明らか
な如く、鋼板１の幅方向の略中央での磁束密度は、従来
において1.46（Ｔ）であったのに対し、本発明装置にお
いては1.80（Ｔ）にまで向上しており、また、側縁から
中央に至る間においても、全般的な磁束密度の向上が達
成されており、幅方向全域に亘る磁束密度の均等化が有
効に実現されていることがわかる。The horizontal axis of the figure is the distance (mm) from one side of the steel plate 1, the vertical axis is the magnetic flux density (T: Tesla) at each position, and the circles in the figure are. , Shows the result when the power supply to the magnetizing coil 6 is performed, and the ● mark also shows the result when the power supply is not performed. As is clear from this figure, the magnetic flux density at the approximate center in the width direction of the steel sheet 1 was 1.46 (T) in the past, but in the device of the present invention, it has improved to 1.80 (T), Further, it is understood that the overall improvement of the magnetic flux density is achieved even from the side edge to the center, and the equalization of the magnetic flux density over the entire width direction is effectively realized.
【００２０】なお本実施例においては、強磁性体ヨーク
５が直流磁化される場合について述べたが、本発明装置
の適用は、交流磁化の場合であっても可能である。但し
この場合、交流磁化に合わせた材質の強磁性体ヨーク５
を用い、これに巻回する磁化コイル６の巻き数を適宜に
設定する必要がある。In the present embodiment, the case where the ferromagnetic material yoke 5 is magnetized by direct current is described, but the device of the present invention can be applied even in the case of alternating current magnetization. However, in this case, the ferromagnetic yoke 5 made of a material suitable for the alternating current magnetization
It is necessary to set the number of turns of the magnetizing coil 6 to be wound around this.
【００２１】[0021]
【発明の効果】以上詳述した如く本発明装置において
は、鋼板の幅方向両側に一対の磁極を臨ませると共に、
これらの間にて鋼板の一面に近接する位置に、この近接
部位の断面積が他の部位のそれよりも小さく設定された
強磁性体ヨークを配したから、磁極間の磁界の作用によ
る前記鋼板の磁化に際し、幅方向中央部付近に生じる磁
束密度の低下が強磁性体ヨークの小面積部からの漏れ磁
束により補完されて、前記鋼板を幅方向の全域に亘って
略均等に磁化できるようになり、簡素な構成により漏洩
磁束法における欠陥検査精度の安定向上に寄与できる
等、本発明は優れた効果を奏する。As described in detail above, in the device of the present invention, a pair of magnetic poles are provided on both sides of the steel sheet in the width direction, and
Since a ferromagnetic material yoke having a cross-sectional area of this adjacent portion set to be smaller than that of the other portion is arranged at a position close to one surface of the steel sheet between them, the steel sheet by the action of a magnetic field between magnetic poles is formed. At the time of magnetization, the decrease in the magnetic flux density generated near the widthwise central portion is complemented by the leakage magnetic flux from the small area portion of the ferromagnetic yoke, so that the steel sheet can be magnetized substantially uniformly over the entire width direction. Therefore, the present invention has excellent effects such as contributing to stable improvement of defect inspection accuracy in the leakage magnetic flux method with a simple configuration.
【図面の簡単な説明】[Brief description of drawings]
【図１】本発明装置の使用状態を示す模式図である。FIG. 1 is a schematic view showing a usage state of a device of the present invention.
【図２】本発明装置の他の実施例を示す模式図である。FIG. 2 is a schematic view showing another embodiment of the device of the present invention.
【図３】本発明装置の効果を示すグラフである。FIG. 3 is a graph showing the effect of the device of the present invention.
１ 鋼板 2a 磁極 2b 磁極 ３ 継鉄 4a 磁化コイル 4b 磁化コイル ５ 強磁性体ヨーク 5a 小面積部 5b 大面積部 ６ 磁化コイル 1 Steel plate 2a Magnetic pole 2b Magnetic pole 3 Yoke 4a Magnetizing coil 4b Magnetizing coil 5 Ferromagnetic yoke 5a Small area 5b Large area 6 Magnetizing coil
───────────────────────────────────────────────────── フロントページの続き (72)発明者 ▲槇▼ 孝一郎 千葉県市川市中国分３−18−５ 住友金属 鉱山株式会社中央研究所内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor ▲ Koichiro Maki 3-18-5 Chugoku, Ichikawa City, Chiba Sumitomo Metal Mining Co., Ltd. Central Research Laboratory
Claims (1)
送ラインに沿って走行する鋼板の幅方向両側縁に夫々臨
ませて配し、両磁極間に形成される磁界の作用により前
記鋼板を連続的に磁化する装置において、前記両磁極の
間にて前記鋼板の一面に近接配置され、前記磁界の方向
に沿う磁気的な閉回路を形成すると共に、前記鋼板との
近接部位の断面積が他の部位のそれよりも小さく設定し
てある強磁性体ヨークを具備することを特徴とする鋼板
の磁化装置。1. A pair of magnetic poles having different polarities are arranged so as to face both side edges in the width direction of a steel sheet traveling along a conveying line, and the steel sheet is formed by the action of a magnetic field formed between the magnetic poles. In a continuously magnetizing device, the magnetic poles are arranged close to one surface of the steel plate between the magnetic poles to form a magnetic closed circuit along the direction of the magnetic field, and the cross-sectional area of the vicinity of the steel plate is A magnetizing device for a steel sheet, comprising a ferromagnetic yoke set to be smaller than that of other portions.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16692893A JPH0722240A (en) | 1993-07-06 | 1993-07-06 | Magnetization system for steel plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16692893A JPH0722240A (en) | 1993-07-06 | 1993-07-06 | Magnetization system for steel plate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0722240A true JPH0722240A (en) | 1995-01-24 |
Family
ID=15840261
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16692893A Pending JPH0722240A (en) | 1993-07-06 | 1993-07-06 | Magnetization system for steel plate |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0722240A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101353811B1 (en) * | 2012-03-20 | 2014-01-22 | 주식회사 포스코 | Steel magnetization apparatus |
| WO2021125186A1 (en) | 2019-12-20 | 2021-06-24 | Ｊｆｅスチール株式会社 | Magnetic leakage inspecting device, and defect inspecting method |
-
1993
- 1993-07-06 JP JP16692893A patent/JPH0722240A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101353811B1 (en) * | 2012-03-20 | 2014-01-22 | 주식회사 포스코 | Steel magnetization apparatus |
| WO2021125186A1 (en) | 2019-12-20 | 2021-06-24 | Ｊｆｅスチール株式会社 | Magnetic leakage inspecting device, and defect inspecting method |
| KR20220098019A (en) | 2019-12-20 | 2022-07-08 | 제이에프이 스틸 가부시키가이샤 | Leakage magnetic inspection device and defect inspection method |
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