JPH09232134A - Anisotropic flat circular permanent magnet and manufacture thereof - Google Patents
Anisotropic flat circular permanent magnet and manufacture thereofInfo
- Publication number
- JPH09232134A JPH09232134A JP3497396A JP3497396A JPH09232134A JP H09232134 A JPH09232134 A JP H09232134A JP 3497396 A JP3497396 A JP 3497396A JP 3497396 A JP3497396 A JP 3497396A JP H09232134 A JPH09232134 A JP H09232134A
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- JP
- Japan
- Prior art keywords
- magnetic
- magnetic body
- magnet
- permanent magnet
- flat annular
- 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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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】コンピュータのフロッピード
ライブユニットやＶＴＲ等、電子機器の駆動部に用いら
れるモータ用異方性偏平環状永久磁石に関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anisotropic flat annular permanent magnet for a motor used in a drive unit of an electronic device such as a floppy drive unit of a computer or a VTR.
【０００２】[0002]
【従来の技術】異方性偏平環状永久磁石は、安価で高い
磁気特性を持つことから電子民生用機器の駆動用モータ
ーとして、広範囲にわたり使用されている。2. Description of the Related Art An anisotropic flat annular permanent magnet is widely used as a drive motor for electronic consumer equipment because it is inexpensive and has high magnetic properties.
【０００３】従来の異方性偏平環状永久磁石は、異方性
方向、即ち磁化容易軸方向の両端面で磁性の強さが異な
っていた。その理由は、磁石の移動パンチ側の圧縮成型
時における成形密度が固定パンチ側の成形密度より高く
なることにより、移動パンチ側の磁性が高くなるものと
考えられていた。In the conventional anisotropic flat annular permanent magnet, the magnetic strength is different on both end faces in the anisotropic direction, that is, the direction of the easy axis of magnetization. It has been considered that the reason is that the compacting density of the magnet on the moving punch side during compression molding is higher than the compacting density on the fixed punch side, so that the magnetism on the moving punch side is increased.
【０００４】磁石の両端面に上記のような磁性の差があ
ることは、例えばマグネトロンやプリントモーターへの
応用のように有利な場合もあるが、リレースイッチ用マ
グネットのように一つのコアから切り出して使用する場
合は両端面の差がない方が良いし、減磁を行って使用す
るマグネットの場合も作業性の面から強磁性面と弱磁性
面の差がない方が有利となる。The above-mentioned difference in magnetism between both end faces of the magnet may be advantageous in application to, for example, a magnetron or a print motor, but cut out from one core like a relay switch magnet. It is better that there is no difference between the two end surfaces when used as a magnet, and in the case of a magnet that is used after demagnetization, it is advantageous from the viewpoint of workability that there is no difference between the ferromagnetic surface and the weak magnetic surface.
【０００５】そこで、両端面の磁気特性の強弱を制御す
る方法が、特公昭６２ー１１０４２号公報等において提
案されている。Therefore, a method of controlling the strength of the magnetic properties of both end surfaces has been proposed in Japanese Patent Publication No. 62-11042.
【０００６】該公報において、磁石の両端面における磁
気特性の強弱を制御するため図４に示すような方法がと
られている。磁場中の圧縮成型時における下側パンチ５
４の磁極面５４ａ面積を固定して、上側パンチ５１の磁
極面５１ａの面積を非磁性リング５２の大きさを変化さ
せることにより変化させ、磁気特性を制御する。ここ
で、５３は臼型であり、５５は成型空間であって、３ａ
は磁場をかけるためのコイルである。In this publication, a method as shown in FIG. 4 is used to control the strength of the magnetic characteristics on both end faces of the magnet. Lower punch 5 during compression molding in a magnetic field
The area of the magnetic pole surface 51a of the upper punch 51 is changed by changing the size of the non-magnetic ring 52 while the area of the magnetic pole surface 54a of No. 4 is fixed, and the magnetic characteristics are controlled. Here, 53 is a mortar type, 55 is a molding space, and 3a
Is a coil for applying a magnetic field.
【０００７】本図に示すように、下側パンチ５４の磁極
面５４ａ面積と上側パンチ５１の磁極面５１ａ面積を等
しくすると、磁石の両端面における磁気特性が等しくな
るのである。As shown in the figure, when the area of the magnetic pole surface 54a of the lower punch 54 and the area of the magnetic pole surface 51a of the upper punch 51 are made equal, the magnetic characteristics at both end surfaces of the magnet become equal.
【０００８】しかし、前記公報に開示されているような
上下パンチの磁極面における面積比を変えて磁気特性を
制御する方法では、上下パンチの被圧縮体、即ち成型体
である磁石に直接接触する面が磁性体と非磁性体の２つ
の部材で構成されることになりパンチ部と成型体が接触
している部分５６では、磁石にクラック、はがれ等の欠
陥が生じやすくなり歩留まりの低下を招くばかりでな
く、特性を制御することが困難であって、磁石の両端面
における磁気特性を等しくすることはできなかった。However, in the method of controlling the magnetic characteristics by changing the area ratio of the magnetic pole surfaces of the upper and lower punches as disclosed in the above publication, the compressed object of the upper and lower punches, that is, the magnet which is the molded body is directly contacted. Since the surface is composed of two members, a magnetic body and a non-magnetic body, in the portion 56 where the punch portion and the molded body are in contact with each other, defects such as cracks and peeling are likely to occur in the magnet, leading to a decrease in yield. Not only that, it was difficult to control the characteristics, and it was not possible to make the magnetic characteristics equal on both end surfaces of the magnet.
【０００９】しかしながら、異方性偏平環状永久磁石の
主要な用途である電子民生用機器の駆動用モーターとし
て使用する場合には異方性偏平環状永久磁石の一方端面
しか使用されないため、使用面である強磁性面側の磁気
特性が一定の大きさ以上であればよく、両端面に磁気特
性の差が生じていても問題とされることはなかった。However, when the anisotropic flat annular permanent magnet is used as a drive motor for electronic consumer equipment, which is a main application, only one end surface of the anisotropic flat annular permanent magnet is used, and therefore, in terms of usage. It suffices that the magnetic characteristics on a certain ferromagnetic surface side be equal to or greater than a certain level, and there is no problem even if there is a difference in magnetic characteristics on both end surfaces.
【００１０】したがって、磁石をモーター等の装置に組
み込む作業時に、使用面である強磁性面が識別できるよ
う、あらかじめ磁石の内径側または外径側に成型時金型
によるカット付けを行ったり、インク等によるマーキン
グを行う工程が必要であった。Therefore, when the magnet is incorporated into a device such as a motor, the inner surface or outer surface of the magnet can be cut with a die during molding so that the ferromagnetic surface, which is the surface to be used, can be identified. It was necessary to have a process of marking with the above.
【００１１】[0011]
【発明が解決しようとする課題】しかし、近年の軽薄短
小の流れの中、異方性偏平環状永久磁石についても例外
ではなく製品厚み５ｍｍ以下の薄型形状のものが主流と
なり、特に製品厚み３ｍｍ以下の異方性偏平環状永久磁
石にあっては該永久磁石の内径側または外径側に成型時
金型によるカット付けをおこなうことは事実上困難とな
り、製品完成後インク等によるマーキングを行うことが
不可欠となった。しかし、これらのインク等によるマー
キング作業は手作業で施工せざるを得ず、成型時金型に
よるカット付けを行うことと比較すると作業効率が著し
く悪化するため、製造コストが増大するという問題が避
けられなくなった。However, in the recent trend of light, thin, short, and small flows, anisotropic flat annular permanent magnets are no exception, and thin-shaped products with a product thickness of 5 mm or less are the mainstream, and product thicknesses of 3 mm or less are the mainstream. In the case of anisotropic flat annular permanent magnets, it is practically difficult to perform cutting on the inner diameter side or outer diameter side of the permanent magnet with a mold at the time of molding, and marking with ink etc. can be performed after the product is completed. Became essential. However, the marking work with these inks, etc. has to be done manually, and the work efficiency is significantly deteriorated compared to cutting with a mold at the time of molding, so the problem of increased manufacturing cost is avoided. I can no longer.
【００１２】そこで、磁石にクラック、はがれ等の欠陥
が発生することがなく、容易に磁石両面の磁気特性の差
が低減することが可能となるような磁気特性を制御する
方法を提供することにより、磁石両面のどちらでも駆動
モーター等に使用面として組み込むことが可能となり、
使用面の識別をするために行うインク等によるマーキン
グ工程を不要とすることが可能なので、異方性偏平環状
永久磁石の製造コストの低減を図ることができる異方性
偏平環状永久磁石の製造方法を提供することを目的とす
る。Therefore, by providing a method for controlling the magnetic characteristics such that defects such as cracks and peeling are not generated in the magnet and the difference between the magnetic characteristics on both sides of the magnet can be easily reduced. , Both sides of the magnet can be incorporated into the drive motor etc.
A method of manufacturing an anisotropic flat annular permanent magnet, which can reduce the manufacturing cost of the anisotropic flat annular permanent magnet, since a marking step using ink or the like for identifying the used surface can be unnecessary. The purpose is to provide.
【００１３】また、製品の厚みが５ｍｍ以下であり、モ
ーター等に組み込む場合の組み付けラインの簡素化およ
び管理負担の大幅な軽減を図ることが可能となる異方性
偏平環状永久磁石を提供することを目的とする。Also, to provide an anisotropic flat annular permanent magnet having a product thickness of 5 mm or less, which can simplify the assembly line and greatly reduce the management load when it is incorporated in a motor or the like. With the goal.
【００１４】[0014]
【課題を解決するための手段】上記目的を達成するため
に請求項１記載の発明は、磁化容易軸方向に異方性を有
する異方性偏平環状永久磁石において、該磁石の厚み寸
法が５ｍｍ以下であって磁石両面の残留磁束密度の差が
１％以下であることを特徴とする異方性偏平環状永久磁
石を提供する。In order to achieve the above object, the invention according to claim 1 is an anisotropic flat annular permanent magnet having anisotropy in the direction of easy magnetization axis, wherein the thickness of the magnet is 5 mm. Provided is an anisotropic flat annular permanent magnet characterized in that the difference in residual magnetic flux densities on both sides of the magnet is 1% or less.
【００１５】したがって、前記磁石両端面のいづれに
も、一方端面を識別するための処理を施していないこと
を特徴とする異方性偏平環状永久磁石を提供することが
できる。Therefore, it is possible to provide an anisotropic flat annular permanent magnet which is characterized in that neither of the both end faces of the magnet is subjected to a treatment for identifying one end face.
【００１６】さらに、請求項２記載の発明は、上下パン
チ、臼型、中棒等から構成される異方性偏平環状永久磁
石用成型装置であって、該異方性偏平環状永久磁石用成
型装置は、前記上下パンチ、臼型、中棒の配置によって
造り出される成型空間を備え、該成型空間にて上下パン
チの圧縮方向と同方向の磁場中で原料粉末を圧縮成形
し、該成形体を焼結して焼結型異方性偏平環状永久磁石
を製造する方法において、前記上側パンチは前記成型空
間と対向する方向に第１の磁性体を備え、該第１の磁性
体は非磁性体で覆われており、かつ前記下側パンチも前
記成型空間と対向する方向に磁性体からなる第２の磁性
体を備え、該第２の磁性体も非磁性体で覆われており、
さらに、前記第１の磁性体は前記成型空間と対向する部
分が凸状に***している異方性偏平環状永久磁石の製造
方法を提供する。Further, the invention according to claim 2 is a molding apparatus for anisotropic flat annular permanent magnets, which is composed of upper and lower punches, a die, a center rod, etc., and is a molding apparatus for anisotropic flat annular permanent magnets. The apparatus has a molding space created by arranging the upper and lower punches, a die, and a center rod, and the raw material powder is compression-molded in the molding space in a magnetic field in the same direction as the compression direction of the upper and lower punches. In the method of manufacturing a sintered anisotropic flat annular permanent magnet by sintering, the upper punch is provided with a first magnetic body in a direction facing the molding space, and the first magnetic body is a non-magnetic material. And the lower punch is also provided with a second magnetic body made of a magnetic body in a direction facing the molding space, and the second magnetic body is also covered with a non-magnetic body,
Further, the first magnetic body provides a method for manufacturing an anisotropic flat annular permanent magnet in which a portion facing the molding space is raised in a convex shape.
【００１７】ここで、凸状に***した前記第１の磁性体
の頂上部の面積は、該磁性体と対向する成型空間の上面
面積の±５％以内であることが望ましく、成型空間の上
面と等しくすることが、さらに望ましい。Here, it is desirable that the area of the top of the first magnetic body that is raised in a convex shape is within ± 5% of the upper surface area of the molding space facing the magnetic body. Is even more desirable.
【００１８】また加えて、請求項３記載の発明は、前記
第１の磁性体を覆う非磁性体部の厚み寸法であって、第
１の磁性体の凸状***部の頂上部に対応する第１の厚み
寸法（Ｌ１）と、前記凸状***部の底部に対応する第２
の厚み寸法（Ｌ２）の比であるＬ１／Ｌ２が２０乃至５
０％である異方性偏平環状永久磁石の製造方法である。In addition, the invention according to claim 3 is the thickness dimension of the non-magnetic body portion covering the first magnetic body, and corresponds to the top of the convex raised portion of the first magnetic body. A first thickness dimension (L1) and a second thickness corresponding to the bottom of the raised ridge.
L1 / L2, which is the ratio of the thickness dimension (L2), is 20 to 5
It is a method of manufacturing an anisotropic flat annular permanent magnet with 0%.
【００１９】[0019]
【発明の実施の形態】従来の異方性偏平環状永久磁石の
両端面に磁気特性の差が生じるのは、図５に示すような
従来から一般に使用されている成型装置において上側パ
ンチ内磁性体６０の成型空間６２に対向する面の面積が
下側パンチ内磁性体５７の成型空間６２に対向する面の
面積より大きいため、磁場中成型時、成型空間６２内を
通る磁束線３が磁化容易軸方向に対して平行にならず、
放射状になってしまうためである。BEST MODE FOR CARRYING OUT THE INVENTION The difference between the magnetic characteristics of both end faces of a conventional anisotropic flat annular permanent magnet is caused by a magnetic material in the upper punch in a conventional molding apparatus as shown in FIG. Since the area of the surface of 60 facing the molding space 62 is larger than the area of the surface of the lower punch magnetic body 57 facing the molding space 62, the magnetic flux lines 3 passing through the molding space 62 are easily magnetized during molding in a magnetic field. Not parallel to the axial direction,
This is because it becomes radial.
【００２０】ここで、図５のうち５８は非磁性ダイスで
あり、５９、６１はそれぞれ上下の磁性体５７、６０を
覆う非磁性体を示す。In FIG. 5, 58 is a non-magnetic die, and 59 and 61 are non-magnetic materials that cover the upper and lower magnetic materials 57 and 60, respectively.
【００２１】そこで、上側パンチに備えられている第１
の磁性体であって成型空間と対向する部分を成型空間と
同等の形状、面積にて凸状に***させることにより、成
型空間を通る磁束線が前記第１の磁性体を通るべく制御
され、その結果成型空間内を通る磁束線の向きを制御す
る。このような制御方法をとることにより、成型空間内
を通る磁束線の向きを磁化容易軸方向にたいして均一に
平行とすることができるため、磁石両端面の磁気特性差
は大幅に低減され、どちらの面もモーター等の使用面と
して使うことができることとなる。Therefore, the first punch provided on the upper punch
Of the magnetic body, the portion facing the molding space is raised in a convex shape in the same shape and area as the molding space, the magnetic flux lines passing through the molding space are controlled to pass through the first magnetic body, As a result, the direction of the magnetic flux lines passing through the molding space is controlled. By adopting such a control method, the direction of the magnetic flux lines passing through the molding space can be made parallel to the easy axis of magnetization uniformly, so that the difference in magnetic characteristics between the two end surfaces of the magnet is significantly reduced. The surface can also be used as a usage surface of a motor or the like.
【００２２】しかも、前記第１の磁性体は非磁性体で覆
われており、直接に磁性面が成型空間に面していないた
め、磁性体からなる磁性面と該磁性体の保持等に供する
非磁性体の境界が直接成型空間に接することがないた
め、磁束の乱れが生づることが少なく容易に磁束の向き
を制御することができる。Moreover, since the first magnetic body is covered with the non-magnetic body and the magnetic surface does not directly face the molding space, it is used for holding the magnetic surface composed of the magnetic body and the like. Since the boundary of the non-magnetic material does not directly contact the molding space, disturbance of the magnetic flux is less likely to occur and the direction of the magnetic flux can be easily controlled.
【００２３】さらに、磁性体からなる磁性面と該磁性体
の保持等に供する非磁性体の境界が直接成型空間に接す
ることがないため、成型空間で成型される異方性偏平環
状永久磁石に、クラック、はがれ等の欠陥が発生するこ
とがない。Furthermore, since the boundary between the magnetic surface made of a magnetic material and the non-magnetic material used for holding the magnetic material does not directly contact the molding space, an anisotropic flat annular permanent magnet molded in the molding space can be obtained. Defects such as cracks, peeling, etc. do not occur.
【００２４】このとき、凸状に***した前記第１の磁性
体の頂上部の面積は、該磁性体と対向する成型空間の上
面面積の±５％以内であることが望ましく、成型空間の
上面と等しくすることが、さらに望ましい。At this time, it is desirable that the area of the top of the convex first magnetic body is within ± 5% of the upper surface area of the molding space facing the magnetic body. Is even more desirable.
【００２５】また、上側パンチに備えられている第１の
磁性体を覆う非磁性体部の厚み寸法であって、凸状***
部の頂上部に対応する第１の厚み寸法（Ｌ１）は薄いほ
ど磁気特性の向上が期待できるが、薄くなりすぎると金
型の製造が困難となり、厚くなりすぎると成型空間内を
通る磁束線の向きを制御することができなくなるため、
第１の厚み寸法（Ｌ１）は凸状***部の底部に対応する
第２の厚み寸法（Ｌ２）の２０乃至５０％であることが
望ましく、より好ましくは３０乃至４０％が望ましい。Further, the thickness dimension of the non-magnetic material portion covering the first magnetic material provided in the upper punch, and the first thickness dimension (L1) corresponding to the top of the convex ridge is thin. The magnetic properties can be expected to improve as much as possible, but if the thickness is too thin, it becomes difficult to manufacture the mold, and if it is too thick, it is not possible to control the direction of the magnetic flux lines passing through the molding space.
The first thickness dimension (L1) is preferably 20 to 50% of the second thickness dimension (L2) corresponding to the bottom of the convex ridge, and more preferably 30 to 40%.
【００２６】[0026]
【実施例】次に図を用いてさらに詳細に説明することと
する。Embodiments will now be described in more detail with reference to the drawings.
【００２７】図１（ａ）に示す製造方法で図１（ｂ）に
示すような異方性偏平環状永久磁石を圧縮成型する。An anisotropic flat annular permanent magnet as shown in FIG. 1 (b) is compression molded by the manufacturing method shown in FIG. 1 (a).
【００２８】図１（ａ）は上下パンチの対向面に磁性体
からなる第１の磁性体１および第２の磁性体２を備えて
おり、第１の磁性体は成型空間と対向する部分が成型空
間上面部と同等の形状にて凸状に***１ａした構造とな
っている。またさらに、上下パンチに具備される前記第
１および第２の磁性体はそれぞれ第１の非磁性体６およ
び第２の非磁性体１０で覆われている。In FIG. 1A, a first magnetic body 1 and a second magnetic body 2 made of a magnetic material are provided on the facing surfaces of the upper and lower punches, and the first magnetic body has a portion facing the molding space. It has a structure in which a protrusion 1a is formed in a convex shape in the same shape as the upper surface of the molding space. Furthermore, the first and second magnetic bodies provided in the upper and lower punches are covered with a first non-magnetic body 6 and a second non-magnetic body 10, respectively.
【００２９】非磁性の臼型７と中棒８によって成型空間
を形成し上下パンチによって外形６０ｍｍ、内径３０ｍ
ｍ厚み２．６ｍｍの異方性偏平環状永久磁石を圧縮成型
する。A molding space is formed by the non-magnetic mortar die 7 and the intermediate rod 8 and an outer diameter of 60 mm and an inner diameter of 30 m are obtained by punching vertically.
An anisotropic flat annular permanent magnet having a thickness of 2.6 mm is compression molded.
【００３０】ここで、凸状***部の頂上部に対応する第
１の厚み寸法（Ｌ１）４と凸状***部の底部に対応する
第２の厚み寸法（Ｌ２）の比を変化させることにより磁
束線３の向きを制御し、完成した異方性偏平環状永久磁
石の両面における残留磁束密度および発生磁束量とこれ
らの差を図２の図表で示す。また、図３は前記残留磁束
密度および発生磁束量の差とＬ１／Ｌ２の関係を示した
グラフである。By changing the ratio of the first thickness dimension (L1) 4 corresponding to the top of the convex ridge and the second thickness dimension (L2) corresponding to the bottom of the convex ridge, The orientation of the magnetic flux lines 3 is controlled, and the residual magnetic flux density and the generated magnetic flux amount on both surfaces of the completed anisotropic flat annular magnet are shown in the diagram of FIG. FIG. 3 is a graph showing the relationship between the difference between the residual magnetic flux density and the generated magnetic flux amount and L1 / L2.
【００３１】ここで、図２、図３の表における差（％）
は以下の式によって算出した。Here, the difference (%) in the tables of FIG. 2 and FIG.
Was calculated by the following formula.
【００３２】差（％）＝（強磁性面の値ー弱磁性面の
値）÷強磁性面の値×１００ 図２、図３より、Ｌ１／Ｌ２を小さくすれば異方性偏平
環状永久磁石の両面における残留磁束密度および発生磁
束量の差が小さくなることがわかる。Difference (%) = (value of ferromagnetic surface−value of weak magnetic surface) ÷ value of ferromagnetic surface × 100 From FIGS. 2 and 3, if L1 / L2 is reduced, an anisotropic flat annular permanent magnet is obtained. It can be seen that the difference between the residual magnetic flux density and the amount of generated magnetic flux on both sides of is small.
【００３３】したがって、異方性偏平環状永久磁石の両
面における残留磁束密度および発生磁束量の差が小さく
なっているので、磁束の向きが磁化容易軸と同等の方向
に水平に並び、その結果両面の磁気特性の値の間に差が
無くなっていることが容易に推定できる。Therefore, since the difference between the residual magnetic flux density and the generated magnetic flux amount on both surfaces of the anisotropic flat annular permanent magnet is small, the directions of the magnetic flux are aligned horizontally in the same direction as the easy axis of magnetization, resulting in both surfaces. It can be easily estimated that there is no difference between the values of the magnetic properties.
【００３４】ここで、異方性偏平環状永久磁石の両面に
おける残留磁束密度の差が１％を超えると磁石両面の磁
気特性が同等とはいえなくなるため、本実施例よりＬ１
／Ｌ２の値が５０％以下でなければならないことがわか
る。Here, if the difference in the residual magnetic flux densities on both sides of the anisotropic flat annular permanent magnet exceeds 1%, the magnetic characteristics on both sides of the magnet cannot be said to be equivalent, so L1 is more than that of this embodiment.
It can be seen that the value of / L2 must be 50% or less.
【００３５】さらに図２、図３をみると、Ｌ１／Ｌ２の
値が２５〜３３％の範囲では逆に、異方性偏平環状永久
磁石の両面における残留磁束密度および発生磁束量の値
の差が大きくなっている。2 and 3, when the value of L1 / L2 is in the range of 25 to 33%, conversely, the difference between the residual magnetic flux density and the generated magnetic flux amount on both surfaces of the anisotropic flat annular permanent magnet. Is getting bigger.
【００３６】これは、前記第１の磁性体は非磁性体で覆
われており、直接に磁性面が成型空間に面していないた
め、磁性体からなる磁性面と該磁性体の保持等に供する
非磁性体の境界が直接成型空間に接することがなく、磁
束の乱れが生づることが少なくなるような構造となって
いるが、凸状***部の頂上部に対応する第１の厚み寸法
（Ｌ１）４が非常に小さく、磁性面と該磁性体の保持等
に供する非磁性体の境界が直接成型空間に接したのと近
似した状態になり、結果として磁気特性を制御できない
状態となるためである。This is because the first magnetic body is covered with a non-magnetic body, and the magnetic surface does not directly face the molding space. The boundary of the non-magnetic material to be served is not in direct contact with the molding space, and the structure is such that turbulence of magnetic flux is less likely to occur, but the first thickness dimension corresponding to the top of the convex ridge. (L1) 4 is so small that the boundary between the magnetic surface and the non-magnetic material used for holding the magnetic material is in direct contact with the molding space, and as a result, the magnetic characteristics cannot be controlled. This is because.
【００３７】また、金型製作上、凸状***部の頂上部に
対応する第１の厚み寸法（Ｌ１）は実質的に６ｍｍ以上
でなければ実現することができない。また、凸状***部
の底部に対応する第２の厚み寸法（Ｌ２）はあまり厚く
しても要求する特性に関与せず、材料費の負担につなが
るため３０ｍｍ以下とすることが妥当である。Further, in manufacturing the mold, the first thickness dimension (L1) corresponding to the top of the convex ridge cannot be realized unless it is substantially 6 mm or more. Further, the second thickness dimension (L2) corresponding to the bottom of the convex raised portion does not contribute to the required characteristics even if it is too thick, and leads to a burden of material cost, so it is appropriate to set it to 30 mm or less.
【００３８】したがって、本実施例よりＬ１／Ｌ２は２
０乃至５０％であることが望ましく、３０乃至４０％と
することがさらに好ましいことがわかる。Therefore, according to the present embodiment, L1 / L2 is 2
It can be seen that it is preferably 0 to 50%, and more preferably 30 to 40%.
【００３９】[0039]
【発明の効果】本発明により、製品の厚みが５ｍｍ以下
であり、モーター等に組み込む場合の組み付けラインの
簡素化および管理負担の大幅な軽減を図ることが可能と
なる異方性偏平環状永久磁石を提供することが可能とな
った。As described above, according to the present invention, the thickness of the product is 5 mm or less, and the anisotropic flat annular permanent magnet which can simplify the assembling line and greatly reduce the management load when it is incorporated in a motor or the like. It has become possible to provide.
【００４０】また、磁石にクラック、はがれ等の欠陥が
発生することがなく、容易に磁石両面の磁気特性の差が
低減することが可能となるような磁気特性を制御する方
法を提供することにより、磁石両面のどちらでも駆動モ
ーター等に使用面として組み込むことが可能となり、使
用面の識別をするために行うインク等によるマーキング
工程を不要とすることが可能であって異方性偏平環状永
久磁石の製造コストの低減を図ることができる異方性偏
平環状永久磁石の製造方法を提供することができる。Further, by providing a method for controlling the magnetic characteristics such that defects such as cracks and peeling are not generated in the magnet and the difference between the magnetic characteristics on both surfaces of the magnet can be easily reduced. , Both sides of the magnet can be incorporated into the drive motor etc. as the use surface, and the marking process using ink or the like for identifying the use surface can be eliminated, and the anisotropic flat annular permanent magnet can be used. It is possible to provide a method for manufacturing an anisotropic flat annular permanent magnet capable of reducing the manufacturing cost of the above.
【図１】本発明にかかる異方性偏平環状永久磁石の製造
方法での圧縮成型工程概念図FIG. 1 is a conceptual diagram of a compression molding process in a method for manufacturing an anisotropic flat annular permanent magnet according to the present invention.
【図２】本発明にかかる製造方法で製造した磁石の磁気
特性を示す図表FIG. 2 is a chart showing magnetic characteristics of a magnet manufactured by a manufacturing method according to the present invention.
【図３】本発明にかかる製造方法で製造した磁石の磁気
特性を示すグラフFIG. 3 is a graph showing magnetic characteristics of a magnet manufactured by a manufacturing method according to the present invention.
【図４】従来の異方性偏平環状永久磁石の磁気特性を制
御する方法の説明図FIG. 4 is an explanatory diagram of a method for controlling the magnetic characteristics of a conventional anisotropic flat annular permanent magnet.
【図５】従来の異方性偏平環状永久磁石の製造方法での
圧縮成型工程概念図FIG. 5 is a conceptual diagram of a compression molding process in a conventional method for producing an anisotropic flat annular permanent magnet.
１ 第１の磁性体 ２ 第２の磁性体 ３ 磁束線 ４ 凸状***部の頂上部に対応する第１の厚み寸法（Ｌ
１） ５ 凸状***部の底部に対応する第２の厚み寸法（Ｌ
２） ６ 第１の非磁性体 ９ 成型空間 １０ 第２の磁性体 ５１ 上側パンチ ５４ 下側パンチ1 1st magnetic body 2 2nd magnetic body 3 Magnetic flux line 4 1st thickness dimension (L corresponding to the top of a convex ridge part)
1) 5 Second thickness dimension corresponding to the bottom of the convex ridge (L
2) 6 first non-magnetic material 9 molding space 10 second magnetic material 51 upper punch 54 lower punch
Claims (3)
平環状永久磁石において、該磁石の厚み寸法が５ｍｍ以
下であって磁石両面の残留磁束密度の差が１％以下であ
ることを特徴とする異方性偏平環状永久磁石。1. An anisotropic flat annular permanent magnet having anisotropy in the direction of easy axis of magnetization, wherein the thickness of the magnet is 5 mm or less and the difference in residual magnetic flux density on both sides of the magnet is 1% or less. An anisotropic flat annular permanent magnet.
異方性偏平環状永久磁石用成型装置であって、該異方性
偏平環状永久磁石用成型装置は、前記上下パンチ、臼
型、中棒の配置によって造り出される成型空間を備え、
該成型空間にて上下パンチの圧縮方向と同方向の磁場中
で原料粉末を圧縮成形し、該成形体を焼結して焼結型異
方性偏平環状永久磁石を製造する方法において、 前記上側パンチは前記成型空間と対向する方向に第１の
磁性体を備え、該第１の磁性体は非磁性体で覆われてお
り、かつ前記下側パンチも前記成型空間と対向する方向
に磁性体からなる第２の磁性体を備え、該第２の磁性体
も非磁性体で覆われており、 さらに、前記第１の磁性体は前記成型空間と対向する部
分が凸状に***していることを特徴とする異方性偏平環
状永久磁石の製造方法。2. An anisotropic flat annular permanent magnet molding apparatus comprising an upper and lower punch, a die, a center rod and the like, wherein the anisotropic flat annular permanent magnet molding apparatus comprises the upper and lower punches and a die. Equipped with a molding space created by the arrangement of the mold and center rod,
In the method for producing a sintered anisotropic flat annular permanent magnet by compression molding raw material powder in a magnetic field in the same direction as the compression direction of upper and lower punches in the molding space, and sintering the compact. The punch includes a first magnetic body in a direction facing the molding space, the first magnetic body is covered with a non-magnetic body, and the lower punch also has a magnetic body in a direction facing the molding space. And a second magnetic body which is also covered with a non-magnetic body. Further, the first magnetic body has a convex portion protruding in a portion facing the molding space. A method of manufacturing an anisotropic flat annular permanent magnet, characterized in that
寸法であって、第１の磁性体の凸状***部の頂上部に対
応する第１の厚み寸法（Ｌ１）と、前記凸状***部の底
部に対応する第２の厚み寸法（Ｌ２）の比であるＬ１／
Ｌ２が２０乃至５０％であることを特徴とする請求項２
記載の異方性偏平環状永久磁石の製造方法。3. A thickness dimension of a non-magnetic body portion covering the first magnetic body, the first thickness dimension (L1) corresponding to the top of the convex ridge portion of the first magnetic body, The ratio L1 / of the second thickness dimension (L2) corresponding to the bottom of the convex ridge is L1 /.
L2 is 20 to 50%.
A method for producing the anisotropic flat annular permanent magnet described.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8034973A JP3007293B2 (en) | 1996-02-22 | 1996-02-22 | Anisotropic flat annular permanent magnet and manufacturing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8034973A JP3007293B2 (en) | 1996-02-22 | 1996-02-22 | Anisotropic flat annular permanent magnet and manufacturing method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09232134A true JPH09232134A (en) | 1997-09-05 |
| JP3007293B2 JP3007293B2 (en) | 2000-02-07 |
Family
ID=12429094
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8034973A Expired - Fee Related JP3007293B2 (en) | 1996-02-22 | 1996-02-22 | Anisotropic flat annular permanent magnet and manufacturing method thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3007293B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI615859B (en) * | 2016-10-14 | 2018-02-21 | 財團法人金屬工業研究發展中心 | Anisotropic magnet manufacturing method and magnet manufacturing equipment |
-
1996
- 1996-02-22 JP JP8034973A patent/JP3007293B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI615859B (en) * | 2016-10-14 | 2018-02-21 | 財團法人金屬工業研究發展中心 | Anisotropic magnet manufacturing method and magnet manufacturing equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3007293B2 (en) | 2000-02-07 |
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