JPH11186019A - Magnetic shielding part - Google Patents
Magnetic shielding partInfo
- Publication number
- JPH11186019A JPH11186019A JP9348171A JP34817197A JPH11186019A JP H11186019 A JPH11186019 A JP H11186019A JP 9348171 A JP9348171 A JP 9348171A JP 34817197 A JP34817197 A JP 34817197A JP H11186019 A JPH11186019 A JP H11186019A
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- Japan
- Prior art keywords
- magnetic
- parts
- magnetic shield
- weight
- alloy
- 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.)
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- Soft Magnetic Materials (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、磁気シールド部品
に係り、特に磁気シールド性および溶接性を損うことな
く熱間加工性を大幅に改善でき、磁気ヘッドの磁気シー
ルドケースとして有用な磁気シールド部品に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic shield part, and more particularly to a magnetic shield useful as a magnetic shield case for a magnetic head, which can greatly improve hot workability without impairing the magnetic shieldability and weldability. Related to parts.
【０００２】[0002]
【従来の技術】テープレコーダなどの磁気記録装置，情
報機器や音響装置に装備される磁気ヘッドにおいては、
磁気テープなどの記録媒体からの信号磁束以外の外部磁
界による雑音電圧を最小限に抑制しＳ／Ｎ比を高めるた
めに高透磁率を有する磁性材料を用いて磁気シールドを
実施している。従来から磁気ヘッド用の磁気シールド部
品としては、例えば磁気シールドケースがあり、これら
の部品の構成材として、高透磁率を有するニッケル（Ｎ
ｉ）−鉄（Ｆｅ）系軟磁性合金等のいわゆるＰＣパーマ
ロイが一般に使用されている。2. Description of the Related Art In a magnetic head mounted on a magnetic recording device such as a tape recorder, an information device or an audio device,
In order to minimize a noise voltage due to an external magnetic field other than a signal magnetic flux from a recording medium such as a magnetic tape and to increase an S / N ratio, a magnetic shield is implemented using a magnetic material having a high magnetic permeability. Conventionally, as a magnetic shield component for a magnetic head, for example, there is a magnetic shield case, and as a component of these components, nickel (N
i) A so-called PC permalloy such as an iron (Fe) soft magnetic alloy is generally used.
【０００３】そして、近年の情報機器や音響装置の小形
化，省資源化、ひいては磁気ヘッドの小形化，省資源化
の要求に伴い、磁気シールドケースの小型化および薄肉
化も進行しており、薄肉化した場合においても、充分な
磁気シールド効果が得られる、より透磁率の高い磁性合
金材料が求められている。[0003] With the recent demand for downsizing and resource saving of information equipment and audio equipment, and further downsizing and resource saving of the magnetic head, the size and thickness of the magnetic shield case have been reduced. There is a demand for a magnetic alloy material having a higher magnetic permeability that can provide a sufficient magnetic shielding effect even when the thickness is reduced.
【０００４】上記磁性合金材料としては、例えば、重量
％で８０％ニッケル（Ｎｉ），５％モリブデン（Ｍ
ｏ），残部鉄（Ｆｅ）から成る８０Ｎｉ−５Ｍｏ−Ｆｅ
合金あるいは重量％で７８％ニッケル（Ｎｉ），５％銅
（Ｃｕ），４％モリブデン（Ｍｏ），残部鉄（Ｆｅ）か
ら成る７８Ｎｉ−５Ｃｕ−４Ｍｏ−Ｆｅ合金が一般に使
用されている。As the magnetic alloy material, for example, 80% nickel (Ni), 5% molybdenum (M
o), 80Ni-5Mo-Fe consisting of the balance iron (Fe)
An alloy or a 78Ni-5Cu-4Mo-Fe alloy composed of 78% nickel (Ni), 5% copper (Cu), 4% molybdenum (Mo), and the balance iron (Fe) by weight is generally used.
【０００５】また、オーディオ機器用の磁気ヘッドは、
一般に図１に示すように磁気ヘッド本体１を収容した磁
気シールドケース２を、ステンレス鋼などから成る台板
３にスポット溶接して一体化して取り付けられ、この台
板３を介してオーディオ機器の所定位置に磁気ヘッド本
体１が固定される。また磁気テープなどの記録媒体を磁
気ヘッド本体１表面の所定位置に案内するためのテープ
ガイド４も磁気シールドケース２の側面にスポット溶接
により接合される。A magnetic head for audio equipment is
Generally, as shown in FIG. 1, a magnetic shield case 2 accommodating a magnetic head main body 1 is spot-welded and integrally attached to a base plate 3 made of stainless steel or the like. The magnetic head main body 1 is fixed at the position. A tape guide 4 for guiding a recording medium such as a magnetic tape to a predetermined position on the surface of the magnetic head body 1 is also joined to the side surface of the magnetic shield case 2 by spot welding.
【０００６】ここで上記台板３やテープガイド４と磁気
シールドケース２とのスポット溶接箇所５における接合
強度が低い場合には、稼動中に磁気ヘッド本体１やテー
プガイド４が台板３や磁気シールドケース２から脱落し
易くなる。そのため、磁気シールドケース２には、台板
３やテープガイド４に対してスポット溶接性が良好であ
ることが要求されている。If the joining strength between the base plate 3 or the tape guide 4 and the magnetic shield case 2 at the spot welding point 5 is low, the magnetic head main body 1 and the tape guide 4 are moved during the operation. It becomes easy to fall off from the shield case 2. Therefore, the magnetic shield case 2 is required to have good spot weldability to the base plate 3 and the tape guide 4.
【０００７】上記要求特性を満足する磁気シールドケー
スなどの磁気シールド部品として、本発明者らは先に特
開平４−１４１５３８号公報で示すような、良好な磁気
特性を有するとともに、スポット溶接性にも優れた磁気
シールド部品を開発した。As a magnetic shield component such as a magnetic shield case which satisfies the above-mentioned required characteristics, the present inventors have good magnetic characteristics as described in Japanese Patent Application Laid-Open No. 4-141538 and have a high spot weldability. Also developed excellent magnetic shield parts.
【０００８】[0008]
【発明が解決しようとする課題】しかしながら、上記従
来の磁気シールド部品は熱間加工性に劣っていたため、
素材加工段階において加工歩留りが低く不経済となる問
題点があった。すなわち、所定組成から成るブロック状
磁性合金を圧延ロールに通して熱間圧延し所定厚さの板
材に加工しようとすると、板材の両縁部（耳部）に割れ
が発生し易く、素材の利用効率が大幅に低下し、最終的
に形成する磁気シールド部品の製造歩留りも低下し、製
造原価が大幅に上昇してしまう問題点があった。However, since the above-mentioned conventional magnetic shield parts are inferior in hot workability,
There was a problem that the processing yield was low and uneconomical in the material processing stage. That is, when a block-shaped magnetic alloy having a predetermined composition is hot-rolled through a rolling roll and processed into a plate having a predetermined thickness, cracks are easily generated at both edges (ears) of the plate, and the material is used. There is a problem in that the efficiency is greatly reduced, the production yield of the finally formed magnetic shield component is also reduced, and the production cost is significantly increased.
【０００９】本発明は、上記従来の磁気シールド部品の
問題点を解決するためになされたものであり、磁気特性
の劣化が少なく、十分な磁気シールド性および溶接性を
有するとともに、熱間加工性を大幅に改善した磁気シー
ルド部品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 problems of the above-mentioned conventional magnetic shield parts, and has a small deterioration in magnetic properties, has a sufficient magnetic shield property and weldability, and has a hot workability. It is an object of the present invention to provide a magnetic shield component in which the magnetic shield component is greatly improved.
【００１０】[0010]
【課題を解決するための手段】本発明者らは上記目的を
達成するために種々の組成を有する軟磁性材を調製して
磁気シールド部品を形成し、その組成，添加元素の種類
および添加量が磁気シールド部品の透磁率，磁気シール
ド特性，スポット溶接性および素材の熱間加工性に及ぼ
す影響を実験により比較研究した。その結果、軟磁性合
金組成に微量のマグネシウム（Ｍｇ）とアルミニウム
（Ａｌ）とを併用して添加し、軟磁性材として所定組成
を有するＮｉ−Ｃｕ−Ｍｎ−Ｓｉ−Ａｌ−Ｍｇ−Ｆｅ系
合金材またはＮｉ−Ｃｕ−Ｍｎ−Ｓｉ−Ｍｏ−Ａｌ−Ｍ
ｇ−Ｆｅ系合金材を使用したときに、これらの合金材の
透磁率が高く、磁気シールド特性およびスポット溶接性
の劣化が少なく、熱間加工性にも優れていることが判明
した。本発明は、上記知見に基づいて完成されたもので
ある。Means for Solving the Problems In order to achieve the above object, the present inventors prepared soft magnetic materials having various compositions to form a magnetic shield component, the composition, the type of the added element and the amount added. The effect of the influence on the magnetic permeability, magnetic shielding properties, spot weldability and hot workability of the material of the magnetic shield parts was compared experimentally. As a result, a Ni-Cu-Mn-Si-Al-Mg-Fe alloy having a predetermined composition as a soft magnetic material by adding a small amount of magnesium (Mg) and aluminum (Al) to the soft magnetic alloy composition in combination. Material or Ni-Cu-Mn-Si-Mo-Al-M
When g-Fe alloys were used, it was found that these alloys had high magnetic permeability, little deterioration in magnetic shielding properties and spot weldability, and were excellent in hot workability. The present invention has been completed based on the above findings.
【００１１】すなわち本願発明に係る磁気シールド部品
は、重量比でニッケル５５〜８５％，銅０．５〜３％，
マンガン３〜２７％，シリコン０．０２〜２％，アルミ
ニウム０．００１〜０．０５％，マグネシウム０．００
１〜０．０３％，モリブデン８％以下，残部が実質的に
鉄から成る磁性合金により形成したことを特徴とする。
この磁気シールド部品の好適な適用例として、磁気ヘッ
ド用の磁気シールドケースなどがある。That is, the magnetic shield component according to the present invention has a nickel content of 55 to 85% by weight, copper of 0.5 to 3%,
Manganese 3 to 27%, Silicon 0.02 to 2%, Aluminum 0.001 to 0.05%, Magnesium 0.00
1 to 0.03%, molybdenum 8% or less, with the balance being formed of a magnetic alloy substantially composed of iron.
A preferable application example of the magnetic shield component is a magnetic shield case for a magnetic head.
【００１２】以下に、本発明で使用する磁性合金の組成
である重量％でＮｉ５５〜８５％，Ｃｕ０．５〜３％，
Ｍｎ３〜２７％，Ｓｉ０．０２〜２％，Ｍｏ０〜８％，
アルミニウム０．００１〜０．０５％，マグネシウム
０．００１〜０．０３％，残部実質的にＦｅの各成分の
限定理由について説明する。In the following, the composition of the magnetic alloy used in the present invention is 55 to 85% Ni, 0.5 to 3% Cu,
Mn 3 to 27%, Si 0.02 to 2%, Mo 0 to 8%,
The reasons for limiting the respective components of 0.001 to 0.05% of aluminum, 0.001 to 0.03% of magnesium, and substantially Fe will be described.
【００１３】まず、Ｎｉは軟磁性材としての高透磁率を
得るために必要な元素である。Ｎｉはあまりその量が少
なくても、逆にあまりその量が多くても十分な透磁率を
得ることができないために、そのＮｉの量は５５〜８５
重量％とした。好ましくは７０〜８３重量％、さらに好
ましくは６５〜８０重量％であり、この範囲で最も高い
透磁率を得ることが可能となる。First, Ni is an element necessary for obtaining a high magnetic permeability as a soft magnetic material. If the amount of Ni is too small, or if the amount is too large, sufficient magnetic permeability cannot be obtained.
% By weight. It is preferably 70 to 83% by weight, more preferably 65 to 80% by weight, and the highest magnetic permeability can be obtained in this range.
【００１４】次にＣｕは軟磁性材として高透磁率を得る
とともに、熱間加工時に機械的応力による歪みを受けた
場合においても磁気特性の劣化を小さくするために必要
な元素であり、０．５〜３重量％の範囲で含有される。
含有量が０．５重量％未満と過少な場合には透磁率の向
上効果が得られない。一方、含有量が３重量％を超える
ように過量となる場合には、磁気テープに対する耐摩耗
性が劣化するとともにスポット溶接性も低下するので、
この値を上限とする。したがって、Ｃｕの含有量は０．
５〜３重量％の範囲に設定されるが、１．５〜２．７重
量％の範囲が好ましく、さらに１．４〜２．６重量％が
より好ましい。Next, Cu is an element necessary to obtain a high magnetic permeability as a soft magnetic material and to reduce deterioration of magnetic characteristics even when it is subjected to strain due to mechanical stress during hot working. It is contained in the range of 5 to 3% by weight.
If the content is less than 0.5% by weight, the effect of improving the magnetic permeability cannot be obtained. On the other hand, if the content exceeds 3% by weight, the wear resistance to the magnetic tape deteriorates and the spot weldability also decreases.
This value is the upper limit. Therefore, the content of Cu is 0.1.
It is set in the range of 5 to 3% by weight, preferably in the range of 1.5 to 2.7% by weight, and more preferably in the range of 1.4 to 2.6% by weight.
【００１５】Ｍｎは熱間加工性およびスポット溶接性を
改善する作用および脱酸作用の他に、上記Ｃｕと複合的
に含有されることにより高透磁率を得るとともに歪みの
影響による磁気特性の劣化を低減する作用を有する。Ｍ
ｎの含有量が３重量％未満と過少な場合には上記改善効
果が小さい。一方、含有量が２７重量％を超える過量と
なる場合には、磁束密度，透磁率などの磁気特性の低下
を招き易くなる上に、却って熱間加工性が低下する。し
たがって、Ｍｎ含有量は３〜２７重量％の範囲に設定さ
れるが４〜１８重量％の範囲がより好ましく、さらには
５〜１５重量％がより好ましい。Mn not only has the effect of improving hot workability and spot weldability and deoxidizing effect, but also has a high magnetic permeability by being contained in combination with the above-mentioned Cu, and has a deteriorated magnetic characteristic due to the influence of strain. Has the effect of reducing M
When the content of n is less than 3% by weight, the above-mentioned improvement effect is small. On the other hand, if the content exceeds 27% by weight, the magnetic properties such as the magnetic flux density and the magnetic permeability are likely to be reduced, and the hot workability is rather reduced. Therefore, the Mn content is set in the range of 3 to 27% by weight, but is more preferably in the range of 4 to 18% by weight, and further preferably 5 to 15% by weight.
【００１６】次に、Ｓｉは透磁率を向上させるために有
効な元素である。Ｓｉの添加量が０．０２重量％未満と
なるように添加量が少ないと必要な効果が得られず、逆
に添加量が２重量％を超えるように多いとスポット溶接
性が著しく低下するため、Ｓｉの添加量は０．０２〜２
重量％とした。好ましくは０．１〜１．８重量％、より
好ましくは０．５〜１．５重量％である。Next, Si is an element effective for improving the magnetic permeability. If the addition amount is too small so that the addition amount of Si is less than 0.02% by weight, the required effect cannot be obtained, and if the addition amount exceeds 2% by weight, the spot weldability is significantly reduced. , Si is added in an amount of 0.02 to 2
% By weight. Preferably it is 0.1 to 1.8% by weight, more preferably 0.5 to 1.5% by weight.
【００１７】次に、Ｍｏは磁気特性および耐摩耗性を改
善するために必要な元素であり、０〜８重量％の範囲で
添加される。この元素は微量の添加で十分な効果を得る
ことが可能である。一方、添加量が８重量％を超えるよ
うに多いと、冷間加工性が悪化するとともに、逆に磁気
特性および透磁率が低下し十分な磁気シールド性が得ら
れなくなるために、Ｍｏの添加量は０〜８重量％の範囲
とした。また、磁気ヘッドでは磁気テープとの摺動に対
する耐摩耗性も要求されるため、Ｍｏの添加量は３〜８
重量％の範囲がより好ましく、さらには４〜６重量％が
より好ましい。Next, Mo is an element necessary for improving magnetic properties and wear resistance, and is added in the range of 0 to 8% by weight. A sufficient effect can be obtained by adding a small amount of this element. On the other hand, if the addition amount exceeds 8% by weight, the cold workability deteriorates, and on the other hand, the magnetic properties and the magnetic permeability decrease, so that sufficient magnetic shielding properties cannot be obtained. Was in the range of 0 to 8% by weight. Further, since the magnetic head is required to have wear resistance against sliding with the magnetic tape, the amount of Mo added is 3 to 8
%, More preferably 4 to 6% by weight.
【００１８】また、ＡｌおよびＭｇは熱間加工性を改善
する元素であり、それぞれ０．００１重量％以上を複合
的に添加することにより、熱間加工性の改善効果が得ら
れる。しかしながら、Ａｌ添加量が０．０５重量％を超
える場合またはＭｇ添加量が０．０３重量％を超える場
合には、スポット溶接性が低下するため、上記各添加量
を上限とする。Al and Mg are elements that improve hot workability, and the effect of improving hot workability can be obtained by adding 0.001% by weight or more of each in a complex manner. However, if the amount of Al exceeds 0.05% by weight or the amount of Mg exceeds 0.03% by weight, the spot weldability decreases, so the above respective amounts are set as upper limits.
【００１９】本発明においては、熱間加工性をさらに改
善する目的として、上記含有元素の他に、チタン（Ｔ
ｉ），ジルコニウム（Ｚｒ），カルシウム（Ｃａ），硼
素（Ｂ），炭素（Ｃ）などの各種元素やその他の脱酸
剤，脱硫剤を、総量で１重量％以下の範囲で含有させて
も本発明の効果を妨げるものではない。In the present invention, in order to further improve the hot workability, titanium (T)
i), various elements such as zirconium (Zr), calcium (Ca), boron (B), carbon (C) and other deoxidizing agents and desulfurizing agents in a total amount of 1% by weight or less. It does not hinder the effects of the present invention.
【００２０】本発明に係る磁気シールド部品の製造方法
の一例を説明すると下記の通りである。まず、本発明で
規定した所定組成の軟磁性合金を得るために、常法によ
り金属原料を溶解，鋳造しインゴットとする。得られた
インゴットに鍛造，熱間圧延などの熱間加工および冷間
圧延などの冷間加工を施し、本発明で規定した組成の軟
磁性合金板を得る。An example of a method for manufacturing a magnetic shield component according to the present invention will be described below. First, in order to obtain a soft magnetic alloy having a predetermined composition specified in the present invention, a metal raw material is melted and cast by an ordinary method to form an ingot. The obtained ingot is subjected to hot working such as forging and hot rolling and cold working such as cold rolling to obtain a soft magnetic alloy sheet having the composition specified in the present invention.
【００２１】次に得られた軟磁性合金板から磁気ヘッド
用の磁気シールドケースを磁気シールド部品として形成
する場合には、上記軟磁性合金板をプレスにより絞り加
工を施し所定形状の磁気シールドケースとする。この磁
気シールド部品は、磁性焼鈍として、水素雰囲気中で、
例えば１０００℃近辺の温度で所定時間（例えば１時
間）の条件で熱処理を施されて最終的な磁気シールド部
品となる。Next, when a magnetic shield case for a magnetic head is formed as a magnetic shield component from the obtained soft magnetic alloy plate, the soft magnetic alloy plate is subjected to a drawing process by a press to form a magnetic shield case having a predetermined shape. I do. This magnetic shield part, as a magnetic annealing, in a hydrogen atmosphere,
For example, heat treatment is performed at a temperature around 1000 ° C. for a predetermined time (for example, 1 hour) to obtain a final magnetic shield component.
【００２２】[0022]
【発明の実施の形態】次に本発明の実施形態について以
下の実施例を参照して、より具体的に説明する。Next, embodiments of the present invention will be described more specifically with reference to the following examples.
【００２３】実施例１〜９ 表１左欄に示す各磁性合金組成となるように金属原料を
溶解，鋳造して各実施例用のインゴットを得た。次に得
られた各インゴットに対し、熱間鍛造加工および切削加
工を施すことにより、表面欠陥がない厚さ３０mm×幅１
００mm×長さ１５０mmのブロック状磁性合金とした。さ
らに各ブロック状磁性合金を温度１２００℃に加熱し、
圧延ロールに挿通する熱間圧延を実施することにより、
それぞれ厚さが４mmである磁性合金板材に加工し、熱間
加工性を評価した。 Examples 1 to 9 Metal raw materials were melted and cast to obtain the respective magnetic alloy compositions shown in the left column of Table 1 to obtain ingots for the respective examples. Next, each of the obtained ingots is subjected to hot forging and cutting to obtain a 30 mm thick × 1 width free of surface defects.
A block-shaped magnetic alloy having a size of 00 mm and a length of 150 mm was used. Further, each block-shaped magnetic alloy is heated to 1200 ° C.,
By performing hot rolling inserted through the rolling roll,
Each was processed into a magnetic alloy sheet having a thickness of 4 mm, and hot workability was evaluated.
【００２４】上記熱間加工性は、上記各ブロック状磁性
合金を熱間圧延加工して磁性合金板材とした場合に、磁
性合金板材の両縁部（耳部）の１００mm当りに形成され
る割れの発生数として測定評価した。測定評価結果を表
１に示す。[0024] The hot workability is determined by the fact that when each of the block-shaped magnetic alloys is hot-rolled to form a magnetic alloy sheet, cracks formed per 100 mm at both edges (ears) of the magnetic alloy sheet. Was measured and evaluated. Table 1 shows the evaluation results.
【００２５】さらに、上記厚さが４mmである各磁性合金
板材に冷間加工を施して厚さ０．５mmの磁性合金板材に
加工し、この板材について最大透磁率（μmax ）を測定
した。その結果を併せて表１に示す。Further, each magnetic alloy plate having a thickness of 4 mm was subjected to cold working to form a magnetic alloy plate having a thickness of 0.5 mm, and the maximum magnetic permeability (μ max ) of this plate was measured. Table 1 also shows the results.
【００２６】また、上記のように調製した厚さ０．５mm
の各磁性合金板材について、プレスにより絞り加工を施
すことにより、図１に示すような所定の有底角筒状の磁
気シールドケース２を調製した。さらに調製した磁気シ
ールドケース２をステンレス製の台板３にスポット溶接
して接合した。得られた接合体について、引張り試験機
を用いてスポット溶接箇所６の溶接強度を測定して表１
に示す結果を得た。The thickness 0.5 mm prepared as described above
Each magnetic alloy plate was subjected to drawing by a press to prepare a predetermined rectangular cylindrical magnetic shield case 2 having a bottom as shown in FIG. Further, the prepared magnetic shield case 2 was spot-welded to the stainless steel base plate 3 and joined. About the obtained joined body, the welding strength of the spot welding part 6 was measured using the tensile tester, and Table 1 was shown.
Were obtained.
【００２７】比較例１〜７ 一方、比較として表１左欄に示すように、従来使用され
ている磁性合金および本発明で規定した組成の範囲外の
磁性合金を、上記各実施例と同様の製造方法により製造
し、厚さが４mmである磁性合金板材に加工した際に、板
材の両縁部（耳部）に発生する割れ数を測定して熱間加
工性を評価した。さらに上記磁性合金板材を冷間加工し
て厚さ０．５mmの磁性合金板材とした場合の最大透磁率
（μmax）を測定した。さらに各磁性合金板材を絞り加
工して磁気シールドケースとし、この磁気シールドケー
スを台板にスポット溶接し、スポット溶接箇所の溶接強
度を実施例と同様に測定して、下記表１に示す結果を得
た。 Comparative Examples 1 to 7 On the other hand, as shown in the left column of Table 1 for comparison, a conventionally used magnetic alloy and a magnetic alloy having a composition outside the range specified in the present invention were prepared in the same manner as in the above Examples. The hot workability was evaluated by measuring the number of cracks generated at both edges (ears) of a magnetic alloy plate having a thickness of 4 mm manufactured by the manufacturing method and processing the plate. Further, the maximum magnetic permeability (μ max ) when the magnetic alloy plate was cold-worked into a 0.5 mm thick magnetic alloy plate was measured. Further, each magnetic alloy plate material was drawn to form a magnetic shield case, and this magnetic shield case was spot-welded to the base plate, and the welding strength at the spot-welded portions was measured in the same manner as in the example. The results shown in Table 1 below were obtained. Obtained.
【００２８】[0028]
【表１】 [Table 1]
【００２９】上記表１に示す結果から明らかなように、
Ａｌ成分とＭｇ成分とを複合添加した所定組成から成る
磁性合金を使用した各実施例に係る磁気シールドケース
においては、素材の熱間鍛造加工によって形成される板
材の耳部に発生する割れ数が極めて少なく、熱間加工性
に優れていることが確認できた。また最大透磁率および
溶接強度が、従来組成の部品と比較して低下することが
少なく、優れた磁気シールド特性とスポット溶接性とを
併せ持つことが判明した。As is clear from the results shown in Table 1 above,
In the magnetic shield case according to each embodiment using a magnetic alloy having a predetermined composition in which an Al component and a Mg component are added in combination, the number of cracks generated at the edge of a plate material formed by hot forging of a material is reduced. It was confirmed that it was extremely small and was excellent in hot workability. In addition, it was found that the maximum magnetic permeability and the welding strength were less likely to be reduced as compared with the parts having the conventional composition, and that they had both excellent magnetic shielding properties and spot weldability.
【００３０】一方、ＡｌおよびＭｇ成分が添加されてい
ない比較例１，３に係る磁気シールドケースにおいて
は、スポット溶接強度は高い反面、素材加工途中におい
て加工割れの発生数が多くなり、加工歩留りが大幅に低
下し、磁気シールドケースの製造原価が上昇した。ま
た、ＡｌおよびＭｇ成分を過量に含有した比較例２，４
に係る磁気シールドケースにおいては、素材加工段階に
おける割れの発生がなく優れた熱間加工性を示す反面、
透磁率が小さくなり磁気シールド特性が低下するととも
に、スポット溶接強度も小さく信頼性および耐久性が低
いことが判明した。また、ＢやＣ成分を含有する比較例
５，７に係る磁気シールドケースにおいては、最大透磁
率が低下する一方、Ｔｉ成分を含有する比較例６の磁気
シールドケースにおいては、スポット溶接強度が大幅に
低下することが確認できた。On the other hand, in the magnetic shield cases according to Comparative Examples 1 and 3 in which the Al and Mg components were not added, the spot welding strength was high, but the number of cracks generated during the material processing increased, and the processing yield was low. The manufacturing cost of the magnetic shield case has risen sharply. Comparative Examples 2 and 4 containing excessive amounts of Al and Mg components
In the magnetic shield case according to the, while showing excellent hot workability without the occurrence of cracks in the material processing stage,
It has been found that the magnetic permeability is reduced and the magnetic shielding properties are reduced, and the spot welding strength is small, and the reliability and durability are low. Further, in the magnetic shield cases according to Comparative Examples 5 and 7 containing the B and C components, the maximum magnetic permeability was reduced, whereas in the magnetic shield cases according to Comparative Example 6 containing the Ti component, the spot welding strength was large. Was confirmed to decrease.
【００３１】[0031]
【発明の効果】以上説明の通り本発明に係る磁気シール
ド部品によれば、ＡｌおよびＭｇ成分を所定量含有した
磁性合金で形成されているため、磁気シールド性および
溶接性を損うことなく、熱間加工性を大幅に改善でき、
磁気シールド部品の加工歩留りが向上し、部品の製造原
価を大幅に低減することができる。As described above, according to the magnetic shield component according to the present invention, since it is formed of a magnetic alloy containing a predetermined amount of Al and Mg components, it does not impair the magnetic shield property and weldability. Hot workability can be greatly improved,
The processing yield of the magnetic shield component is improved, and the manufacturing cost of the component can be significantly reduced.
【図１】磁気ヘッドの固定構造を示す斜視図。FIG. 1 is a perspective view showing a fixing structure of a magnetic head.
１ 磁気ヘッド本体 ２ 磁気シールドケース（磁気シールド部品） ３ 台板 ４ テープガイド ５ スポット溶接箇所 DESCRIPTION OF SYMBOLS 1 Magnetic head main body 2 Magnetic shield case (magnetic shield parts) 3 Base plate 4 Tape guide 5 Spot welding spot
Claims (2)
５〜３％，マンガン３〜２７％，シリコン０．０２〜２
％，アルミニウム０．００１〜０．０５％，マグネシウ
ム０．００１〜０．０３％，モリブデン８％以下，残部
が実質的に鉄から成る磁性合金により形成したことを特
徴とする磁気シールド部品。(1) 55-85% of nickel and 0.5% of copper by weight.
5-3%, manganese 3-27%, silicon 0.02-2
%, Aluminum 0.001 to 0.05%, magnesium 0.001 to 0.03%, molybdenum 8% or less, the balance being made of a magnetic alloy substantially composed of iron.
気シールドケースであることを特徴とする請求項１記載
の磁気シールド部品。2. The magnetic shield component according to claim 1, wherein the magnetic shield component is a magnetic shield case for a magnetic head.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9348171A JPH11186019A (en) | 1997-12-17 | 1997-12-17 | Magnetic shielding part |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9348171A JPH11186019A (en) | 1997-12-17 | 1997-12-17 | Magnetic shielding part |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11186019A true JPH11186019A (en) | 1999-07-09 |
Family
ID=18395229
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9348171A Abandoned JPH11186019A (en) | 1997-12-17 | 1997-12-17 | Magnetic shielding part |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH11186019A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102020124189A1 (en) | 2020-09-16 | 2022-03-17 | Mogema BV | Process for the manufacture and design of complex three-dimensional magnetic shielding elements, shielding elements and their use |
-
1997
- 1997-12-17 JP JP9348171A patent/JPH11186019A/en not_active Abandoned
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102020124189A1 (en) | 2020-09-16 | 2022-03-17 | Mogema BV | Process for the manufacture and design of complex three-dimensional magnetic shielding elements, shielding elements and their use |
| WO2022058461A2 (en) | 2020-09-16 | 2022-03-24 | Voestalpine Metal Forming Gmbh | Method for producing and designing complex three-dimensional magnetic shielding elements, shielding elements and use thereof |
| EP4310200A2 (en) | 2020-09-16 | 2024-01-24 | voestalpine Metal Forming GmbH | Method for producing and designing complex three-dimensional magnetic shielding elements, shielding elements and use thereof |
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