JPH0878219A - Compound and bonded magnet - Google Patents
Compound and bonded magnetInfo
- Publication number
- JPH0878219A JPH0878219A JP6215089A JP21508994A JPH0878219A JP H0878219 A JPH0878219 A JP H0878219A JP 6215089 A JP6215089 A JP 6215089A JP 21508994 A JP21508994 A JP 21508994A JP H0878219 A JPH0878219 A JP H0878219A
- Authority
- JP
- Japan
- Prior art keywords
- particle size
- compound
- resin
- magnetic
- magnetic powder
- 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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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/032—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials
- H01F1/10—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials non-metallic substances, e.g. ferrites, e.g. [(Ba,Sr)O(Fe2O3)6] ferrites with hexagonal structure
- H01F1/11—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials non-metallic substances, e.g. ferrites, e.g. [(Ba,Sr)O(Fe2O3)6] ferrites with hexagonal structure in the form of particles
- H01F1/113—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials non-metallic substances, e.g. ferrites, e.g. [(Ba,Sr)O(Fe2O3)6] ferrites with hexagonal structure in the form of particles in a bonding agent
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Hard Magnetic Materials (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、２種の粒度の磁粉に樹
脂を混ぜたコンパウンドおよびコンパウンドを成形した
ボンド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 a compound in which a resin is mixed with magnetic powders of two kinds of particle sizes, and a bonded magnet formed by molding the compound.
【０００２】[0002]
【従来の技術】小型モータ用磁石に代表される磁気部品
として多く使われるフェライトのボンド磁石は、コンパ
ウンドを射出成形により形成したり、更に、磁界中で射
出成形したりし一軸異方性、極異方性あるいはラジアル
異方性などの配向を施したりし、ボンド磁石を製造して
いる。2. Description of the Related Art Ferrite bonded magnets, which are often used as magnetic components such as magnets for small motors, are produced by injection molding a compound or by injection molding in a magnetic field. The bonded magnets are manufactured by providing orientation such as anisotropy or radial anisotropy.
【０００３】コンパウンドは、通常、フェライト磁粉と
熱可塑性樹脂を混合して粉砕した粉末である。このコン
パウンドを射出成形することにより、高い寸法精度、薄
肉複雑形状化が可能であり、軽量、精密部品の成形体を
得ることを最大の特徴としている。The compound is usually a powder obtained by mixing and pulverizing ferrite magnetic powder and a thermoplastic resin. By injection-molding this compound, high dimensional accuracy and thin-walled complex shape are possible, and the main feature is to obtain a molded body of lightweight and precision parts.
【０００４】[0004]
【発明が解決しようとする課題】上述したボンド磁石
は、磁粉と樹脂の混合物であることから、他の樹脂を混
ぜない磁石に比べてその磁性粉体の充填密度が低く、本
質的に磁気特性に限界がある。材料の磁気特性は磁粉の
充填度によるが過度の高密度に充填すると成形性や配向
性の低下が生じるという問題があった。詳述すれば、従
来のボンド磁石の高特性化として、 可塑化時の高流動化、樹脂の熱安定化を図るため
に、磁粉に表面改質剤を添加して造粒してコンパウンド
を作成し、若干の改善を行っている。Since the above-mentioned bonded magnet is a mixture of magnetic powder and resin, the packing density of the magnetic powder is lower than that of a magnet not mixed with other resin, and the magnetic characteristics are essentially Is limited. The magnetic characteristics of the material depend on the filling degree of the magnetic powder, but there is a problem in that if the density is too high, the formability and orientation decrease. More specifically, in order to improve the characteristics of conventional bonded magnets, in order to achieve high fluidity during plasticization and thermal stabilization of resin, a surface modifier is added to the magnetic powder and granulated to form a compound. However, some improvements have been made.
【０００５】 高密度化を得るために、磁粉に混ぜる
樹脂の量を低減する。樹脂量を低減し過ぎると、成形困
難、成形体強度不足が生じてしまい、単純形状品などに
用途が限定されてしまう。To obtain a higher density, the amount of resin mixed with the magnetic powder is reduced. If the amount of resin is reduced too much, molding will be difficult and the strength of the molded body will be insufficient, and the application will be limited to simple shaped products.
【０００６】本発明は、これらの問題を解決するため、
大きいおよび小さい粒径の２種の磁粉に樹脂を混練して
コンパウンドを造粒し、圧縮成形して両者を高密度に充
填した高磁気特性のボンド磁石の製造を実現することを
目的としている。The present invention solves these problems.
It is an object of the present invention to manufacture a bonded magnet having high magnetic characteristics in which a resin is kneaded into two kinds of magnetic powders having a large particle size and a small particle size to granulate a compound, and compression molding is performed to pack the both at high density.
【０００７】[0007]
【課題を解決するための手段】図１を参照して課題を解
決するための手段を説明する。図１において、Ｓ６は、
磁場中成形する工程である。[Means for Solving the Problems] Means for solving the problems will be described with reference to FIG. In FIG. 1, S6 is
This is a step of molding in a magnetic field.
【０００８】Ｓ８は、粉砕する工程である。Ｓ９は、粒
度が５０μｍ以下と、５０〜１００μｍとの粒度にふる
い分けする工程である。S8 is a step of crushing. S9 is a step of sieving into a particle size of 50 μm or less and a particle size of 50 to 100 μm.
【０００９】Ｓ１４は、粒度５０μｍ以下と、５０〜１
００μｍとを混ぜて混練物から所定粒径に造粒し、コン
パウンドを作成する工程である。Ｓ１５は、成形（例え
ば磁場中射出成形）の工程である。S14 has a particle size of 50 μm or less and 50 to 1
It is a step of mixing with 00 μm and granulating the kneaded product to a predetermined particle size to prepare a compound. S15 is a molding (for example, injection molding in a magnetic field) step.
【００１０】Ｓ１６は、作成されたボンド磁石である。S16 is a bond magnet that has been prepared.
【００１１】[0011]
【作用】本発明は、図１に示すように、Ｓ６で磁場中成
形し、Ｓ８で粉砕し、Ｓ９で粒度５０μｍと５０〜１０
０μｍとの２種の粒径にふるい分けし、Ｓ１４でこれら
粒度５０μｍと５０〜１００μｍとの２種の粒径の磁粉
に樹脂５〜２０ｗｔ％を混ぜた混練物から所定粒径に造
粒し、コンパウンドを作成するようにしている。According to the present invention, as shown in FIG. 1, in S6, molding is performed in a magnetic field, S8 is crushed, and in S9, the particle size is 50 μm and 50 to 10 μm.
It is sieved into two particle sizes of 0 μm, and in S14, a kneaded mixture of magnetic particles of two particle sizes of 50 μm and 50 to 100 μm mixed with 5 to 20 wt% of resin is granulated to a predetermined particle size, I try to create a compound.
【００１２】この際、Ｓ６で磁粉を磁場中成形し焼成し
て一軸異方性、極異方性あるいはラジアル異方性の焼結
フェライト磁石を作成し、これを粉砕してふるい分け
し、粒度５０μｍ以下と５０〜１００μｍとの２種の粒
径を得るようにしている。At this time, in S6, the magnetic powder is molded in a magnetic field and fired to produce a uniaxially anisotropic, polar anisotropic or radial anisotropic sintered ferrite magnet, which is crushed and sieved to obtain a particle size of 50 μm. The following two types of particle diameters, 50 to 100 μm, are obtained.
【００１３】また、２種の粒径の磁粉に樹脂として熱可
塑性樹脂あるいは熱硬化性樹脂を５〜２０ｗｔ％を混ぜ
た混練物から所定粒径に造粒し、コンパウンドを作成す
るようにしている。Further, a compound is prepared by granulating a magnetic powder of two kinds of particle diameters to a predetermined particle diameter from a kneaded material in which a thermoplastic resin or a thermosetting resin is mixed as a resin in an amount of 5 to 20 wt%. .
【００１４】また、熱可塑性樹脂を混ぜて作成したコン
パウンドを、加熱成形あるいは磁場中加熱成形してボン
ド磁石を作成するようにしている。また、熱硬化性樹脂
を混ぜて作成したコンパウンドを成形した後、キュアー
してボンド磁石を作成するようにしている。Further, the compound prepared by mixing the thermoplastic resin is heat-molded or heat-molded in a magnetic field to prepare a bond magnet. Further, a compound magnet prepared by mixing a thermosetting resin is molded and then cured to prepare a bonded magnet.
【００１５】従って、大きいおよび小さい粒径の２種の
磁粉に樹脂を混練してコンパウンドを造粒し、圧縮成形
して両者を高密度に充填した高磁気特性のボンド磁石を
製造することが可能となった。Therefore, it is possible to manufacture a bonded magnet having high magnetic properties by kneading a resin into two kinds of magnetic powders having a large particle size and a small particle size to granulate a compound and compression-molding the compound into a high density. Became.
【００１６】[0016]
【実施例】次に、図１から図３を用いて本発明の実施例
の構成および動作を順次詳細に説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the construction and operation of an embodiment of the present invention will be described in detail with reference to FIGS.
【００１７】図１は、本発明の１実施例構成図を示す。
図１において、Ｓ１は、原料を秤量する工程である。こ
こでは、ＢａＣＯ3／ＳｒＣＯ3、Ｆｅ2Ｏ3、添加物の秤
量を行う。FIG. 1 shows a block diagram of an embodiment of the present invention.
In FIG. 1, S1 is a step of weighing raw materials. Here, BaCO 3 / SrCO 3 , Fe 2 O 3 and additives are weighed.
【００１８】Ｓ２は、混合する。Ｓ１で秤量した原料の
微粉末を良く混合する。Ｓ３は、仮焼きする。これは、
例えば図示の右側に記載したように、１２００〜１３５
０°Ｃで仮焼成する。In S2, mixing is performed. The raw material fine powders weighed in S1 are mixed well. In S3, calcination is performed. this is,
For example, as described on the right side of the drawing, 1200-135
Pre-baking at 0 ° C.
【００１９】Ｓ４は、粉砕する。これは、Ｓ３で仮焼成
した焼成物を粉砕し、右側に記載したように、平均粒子
径１．０〜１．３μｍにする。Ｓ５は、ふるい分けす
る。At S4, the material is crushed. This is done by crushing the calcined product that has been preliminarily calcined in S3 to have an average particle size of 1.0 to 1.3 μm as described on the right side. S5 is sieved.
【００２０】Ｓ６は、磁場中成形する。これは、平均粒
子径１．０〜１．３μｍの微粉を、磁場中でプレス成形
し、一軸異方性、極異方性あるいはラジアル異方性のフ
ェライト磁石を作成する。In step S6, molding is performed in a magnetic field. In this method, fine powder having an average particle size of 1.0 to 1.3 μm is press-molded in a magnetic field to produce a uniaxially anisotropic, polar anisotropically or radially anisotropically ferrite magnet.
【００２１】Ｓ７は、焼成する。これは、右側に記載し
たように、１２００〜１３５０°Ｃで焼成する。Ｓ８
は、Ｓ７で焼成した焼成物を細かく粉砕する。In step S7, firing is performed. This is fired at 1200-1350 ° C as described on the right. S8
Is finely crushed in S7.
【００２２】Ｓ９は、Ｓ８で粉砕した磁粉をふるい分け
する。ここでは、粒度Ａ（例えば５０μｍ以下）と、粒
度Ｂ（例えば５０〜１００μｍ）とにふるい分けする。
Ｓ１０は、Ｓ９でふるい分けした粒度Ａ（例えば５０μ
ｍ以下）の磁粉である。In step S9, the magnetic powder crushed in step S8 is sieved. Here, the particle size A (for example, 50 μm or less) and the particle size B (for example, 50 to 100 μm) are used for sieving.
S10 is the particle size A that has been screened in S9 (for example, 50 μ
m or less).
【００２３】Ｓ１１は、Ｓ９でふるい分けした粒度Ｂ
（例えば５０〜１００μｍ）の磁粉である。Ｓ１２は、
アニールする。これは、Ｓ１０、Ｓ１１の粒度Ａ（５０
μｍ以下）および粒度Ｂ（５０〜１００μｍ）の磁粉を
９５０〜１０５０°Ｃでアニールする。S11 is the grain size B which is sieved in S9
It is a magnetic powder (for example, 50 to 100 μm). S12 is
Anneal. This is the grain size A of S10 and S11 (50
Annealing is performed at 950 to 1050 ° C. for the magnetic powder having a particle size B (50 to 100 μm).
【００２４】Ｓ１３は、混練する。これは、Ｓ１２でア
ニールした後の粒度Ａ（５０μｍ以下）および粒度Ｂ
（５０〜１００μｍ）の磁粉を所定割合（例えば等量）
に、樹脂（熱可塑性樹脂あるいは熱硬化性樹脂を５．０
〜２０ｗｔ％）を良く混練する。In S13, kneading is performed. This is the grain size A (50 μm or less) and grain size B after annealing in S12.
Predetermined ratio (for example, equal amount) of magnetic powder (50 to 100 μm)
Resin (thermoplastic resin or thermosetting resin 5.0
~ 20 wt%) is well kneaded.
【００２５】Ｓ１４は、造粒する。これは、Ｓ１３で粒
度Ａ（５０μｍ以下）および粒度Ｂ（５０〜１００μ
ｍ）の磁粉に樹脂を混練した後、所定粒径のコンパウン
ドに造粒する。In step S14, granulation is performed. This is because the particle size A (50 μm or less) and the particle size B (50 to 100 μm) in S13.
After the resin is kneaded with the magnetic powder of m), it is granulated into a compound having a predetermined particle size.
【００２６】Ｓ１５は、成形する。これは、コンパウン
ドの樹脂が熱可塑性樹脂の場合には、磁場中射出成形に
より、コンパウンド中の磁粉を磁場方向に整列させた状
態で加熱成形し、一軸異方性、極異方性あるいはラジア
ル異方性のボンド磁石を製造する。コンパウンドの樹脂
が熱硬化性樹脂の場合には、成形した後、キュアーして
樹脂を熱硬化させてボンド磁石を製造する。In step S15, molding is performed. This is because when the resin of the compound is a thermoplastic resin, it is subjected to uniaxial anisotropy, polar anisotropy or radial anisotropy by injection molding in a magnetic field and heat molding with the magnetic particles in the compound aligned in the magnetic field direction. Manufactures anisotropic bonded magnets. When the resin of the compound is a thermosetting resin, it is molded and then cured to thermoset the resin to produce a bonded magnet.
【００２７】Ｓ１６は、Ｓ１５の成形によって製造され
たボンド磁石である。以上によって、磁場中冷却した一
軸異方性、極異方性あるいはラジアル異方性を持つ、粒
度Ａ（粒径５０μｍ以下）と粒度Ｂ（粒径５０〜１００
μｍ）を混練して造粒し、コンパウンドを作成する。こ
の作成したコンパウンドを磁場中射出成形して一軸異方
性、極異方性、あるいはラジアル異方性のボンド磁石を
製造する。このように粒度Ａ（粒径５０μｍ以下）と粒
度Ｂ（粒径５０〜１００μｍ）と異なる２種の磁粉に樹
脂を混ぜてコンパウンドを作成しているため、成形して
ボンド磁石としたときに大きい粒度Ｂの隙間に小さい粒
度Ａの磁粉が入り込み、充填度を高めて高磁気特性のボ
ンド磁石を作成することが可能となった。S16 is a bond magnet manufactured by the molding of S15. From the above, the particle size A (particle size 50 μm or less) and the particle size B (particle size 50 to 100) having uniaxial anisotropy, polar anisotropy or radial anisotropy cooled in a magnetic field are obtained.
μm) is kneaded and granulated to form a compound. The produced compound is injection-molded in a magnetic field to manufacture a uniaxially anisotropic, polar anisotropically or radially anisotropically bonded magnet. As described above, the resin is mixed with two kinds of magnetic powders having different particle sizes A (particle size 50 μm or less) and particle size B (particle size 50 to 100 μm) to form a compound, which is large when formed into a bonded magnet. It became possible to create a bonded magnet with high magnetic characteristics by increasing the filling degree by inserting the magnetic powder of the small particle size A into the gap of the particle size B.
【００２８】図２は、本発明の概念説明図を示す。図２
の（ａ）は、配向方向を示す。ここで、小さい粒子が図
１のＳ１０の粒度Ａ（５０μｍ以下）であって、大きい
粒子が図１のＳ１１の粒度Ｂ（５０〜１００μｍ）であ
る。このように、大きい粒子と小さい粒子を混合してい
るため、成形してボンド磁石にすると、大きい粒子の間
に小さい粒子が納まり、全体として充填率が高くなり、
磁気特性が向上する（図３の（ｃ）参照）。FIG. 2 is a conceptual explanatory view of the present invention. Figure 2
(A) indicates the orientation direction. Here, the small particles are the particle size A of S10 in FIG. 1 (50 μm or less), and the large particles are the particle size B of S11 in FIG. 1 (50 to 100 μm). In this way, since large particles and small particles are mixed, when molded into a bonded magnet, small particles are housed between large particles, and the filling rate as a whole increases,
The magnetic characteristics are improved (see (c) of FIG. 3).
【００２９】図２の（ｂ）は異方性焼結磁石の場合を示
し、図２の（ｃ）は等方性焼結磁石の場合を示し、これ
ら両者は図２の（ａ）の１つの大きい粒子および小さい
粒子を拡大してその内部の微細な磁粉の磁化の配向方向
を示したものである。FIG. 2 (b) shows the case of an anisotropic sintered magnet, FIG. 2 (c) shows the case of an isotropic sintered magnet, both of which are indicated by 1 in FIG. FIG. 3 is an enlarged view of two large particles and a small particle, and shows the orientation direction of the magnetization of the fine magnetic particles therein.
【００３０】図２の（ｂ）の異方性焼結磁石の磁化の方
向は、図示のように全て上方向を向いている。この一定
の上方向に磁化が向いたいわゆる一軸異方性を持つもの
である。この異方性焼結磁石の５０μｍ以下の粒子と、
５０〜１００μｍの粒子とを例えば等量に、熱可塑性樹
脂を５〜２０ｗｔ％混ぜて造粒したものが本発明のコン
パウンドである。このコンパウンドを磁場中射出成形し
てボンド磁石を作成すると、図２の（ａ）のように一軸
異方性磁石の磁化の方向が全て整列し、例えば上方向に
整列してこの方向に極めて着磁し易くなり、高磁気特性
の永久磁石を得ることができる。The magnetization directions of the anisotropic sintered magnet shown in FIG. 2B are all upward as shown in the figure. It has a so-called uniaxial anisotropy in which the magnetization is oriented in this fixed upward direction. Particles of 50 μm or less of this anisotropic sintered magnet,
The compound of the present invention is obtained by mixing 50 to 100 μm particles in the same amount and granulating the thermoplastic resin in an amount of 5 to 20 wt%. When this compound is injection-molded in a magnetic field to produce a bonded magnet, all the magnetization directions of the uniaxial anisotropic magnet are aligned as shown in FIG. It becomes easy to magnetize, and a permanent magnet with high magnetic characteristics can be obtained.
【００３１】一方、図２の（ｃ）の等方性焼結磁石の磁
化の方向は、図示のように全ての方向を向いている。磁
化するときはその方向に向けるだけの大きさの磁界が必
要となる。On the other hand, the direction of magnetization of the isotropic sintered magnet shown in FIG. 2C is in all directions as shown in the figure. When magnetized, a magnetic field of a magnitude sufficient to orient in that direction is required.
【００３２】図３は、実験例を示す。図３の（ａ）は従
来の実験例を示す。試料＃１は、フェライト磁粉が９
１．５ｗｔ％、熱可塑性樹脂が８．５ｗｔ％であり、汎
用のものであり、樹脂が少し多いものである。FIG. 3 shows an experimental example. FIG. 3A shows a conventional experimental example. Sample # 1 contains 9 ferrite powders
Since it is 1.5 wt% and the thermoplastic resin is 8.5 wt%, it is a general-purpose resin and a little resin is contained.
【００３３】試料＃２は、フェライト磁粉が９３．０ｗ
ｔ％、熱可塑性樹脂が７．０ｗｔ％であり、高特性のも
のであり、樹脂を少なくし、高充填率にしたものであ
る。従来の高特性の試料＃２は、汎用の試料＃１に比
し、樹脂を少なくして磁粉の充填率を高めたため、磁気
特性Ｂｒ、ＢＨが大きくなっているが、曲げ強度が小さ
くなっている。このため、試料＃２は、複雑形状を成形
したボンド磁石の作成が困難となっている。Sample # 2 contained 93.0 w of ferrite magnetic powder.
t% and 7.0 wt% of the thermoplastic resin have high characteristics, and the amount of the resin is small and the filling rate is high. Compared to the general-purpose sample # 1, the conventional high-characteristic sample # 2 has less resin and has a higher packing rate of magnetic powder, so that the magnetic characteristics Br and BH are larger, but the bending strength is smaller. There is. Therefore, in sample # 2, it is difficult to form a bonded magnet having a complicated shape.
【００３４】図３の（ｂ）は本発明の実験例を示す。こ
れは、既述したように、５０μｍ以下の磁粉と、５０〜
１００μｍの磁粉とを等量混ぜて９３．５ｗｔ％、ナイ
ロン１２（熱可塑性樹脂）６．５ｗｔ％を混ぜて造粒し
たコンパウンドを用い、磁場中射出成形してボンド磁石
を作成したときの実験例である。この実験例によれば、
従来の図３の（ａ）の試料＃２よりも磁粉を９３．５ｗ
ｔ％と多くしても、その曲げ強度が９５０ｋｇ／ｃｍ2
あって、従来の試料＃１の汎用品よりも高く、高特性の
ボンド磁石ができ、複雑形状の射出成形が可能となっ
た。FIG. 3B shows an experimental example of the present invention. As described above, this is because the magnetic powder of 50 μm or less,
An experiment example in which a bond magnet was prepared by injection molding in a magnetic field using a compound in which 93.5 wt% of 100 μm magnetic powder and 93.5 wt% of nylon 12 (thermoplastic resin) were mixed and granulated. Is. According to this experimental example,
93.5w more magnetic powder than the conventional sample # 2 of FIG.
Even if it is increased to t%, the bending strength is 950 kg / cm 2
Therefore, a bond magnet having higher characteristics and higher characteristics than the conventional general-purpose product of Sample # 1 can be formed, and injection molding of a complicated shape is possible.
【００３５】[0035]
【発明の効果】以上説明したように、本発明によれば、
大きいおよび小さい粒径の２種の磁粉に樹脂を混練して
コンパウンドを造粒し、圧縮成形する構成を採用してい
るため、磁粉を高密度に充填した高磁気特性のボンド磁
石を製造するコンパウンドおよびボンド磁石ができた。
この際、磁粉として磁場中冷却して一軸異方性、極異方
性あるいはラジアル異方性の５０μｍ以下の磁粉および
５０〜１００μｍの磁粉の両者を混ぜて造粒してコンパ
ウンドを作成しているため、磁粉を高充填かつ高磁気特
性のボンド磁石を成形するコンパウンドを作成できた。
また、このコンパウンドから成形したボンド磁石は高密
度かつ高磁気特性かつ高曲げ強度を得ることができ、複
雑形状のボンド磁石を製造できる。As described above, according to the present invention,
A compound that manufactures a bond magnet with high magnetic properties in which magnetic powder is densely packed, because a composition is used in which two types of magnetic powder of large and small particle sizes are kneaded with resin to granulate the compound and then compression molded. And a bond magnet was made.
At this time, the magnetic powder is cooled in a magnetic field and mixed with both uniaxial anisotropy, polar anisotropy or radial anisotropy of 50 μm or less and 50-100 μm of magnetic powder to form a compound. Therefore, it was possible to create a compound that was highly filled with magnetic powder and molded a bonded magnet with high magnetic properties.
In addition, the bond magnet molded from this compound can obtain high density, high magnetic characteristics and high bending strength, and can manufacture a bond magnet having a complicated shape.
【図１】本発明の１実施例構成図である。FIG. 1 is a configuration diagram of an embodiment of the present invention.
【図２】本発明の概念説明図である。FIG. 2 is a conceptual explanatory diagram of the present invention.
【図３】実験例である。FIG. 3 is an experimental example.
Ｓ２：混合 Ｓ６：磁場中成形 Ｓ７：焼成 Ｓ８：粉砕 Ｓ９：ふるい Ｓ１０：粒度Ａ（５０μｍ以下） Ｓ１１：粒度Ｂ（５０〜１００μｍ） Ｓ１３：混練 Ｓ１４：造粒 Ｓ１５：成形（磁場中射出成形） Ｓ１６：ボンド磁石 S2: Mixing S6: Molding in magnetic field S7: Firing S8: Grinding S9: Sieve S10: Particle size A (50 μm or less) S11: Particle size B (50 to 100 μm) S13: Kneading S14: Granulation S15: Molding (injection molding in magnetic field) S16: Bonded magnet
Claims (5)
５０μｍ以下の磁粉と５０〜１００μｍの磁粉、および
樹脂５〜２０ｗｔ％を混ぜて造粒したコンパウンド。1. A compound obtained by mixing and granulating a magnetic powder having a particle size of 50 μm or less, a magnetic powder having a particle size of 50 to 100 μm, and a resin of 5 to 20 wt% obtained by crushing and selecting a sintered ferrite magnet.
場中成形し焼成して一軸異方性、極異方性あるいはラジ
アル異方性の焼結フェライト磁石としたことを特徴とす
る請求項１に記載のコンパウンド。2. The sintered ferrite magnet, wherein magnetic powder is molded in a magnetic field and fired to obtain a uniaxially anisotropic, polar anisotropically or radially anisotropically sintered sintered ferrite magnet. Compound described in.
樹脂としたことを特徴とする請求項１に記載のコンパウ
ド。3. The compound according to claim 1, wherein the resin is a thermoplastic resin or a thermosetting resin.
ンパウンドを、加熱成形あるいは磁場中加熱成形して作
成したボンド磁石。4. A bond magnet produced by heat molding or heat molding in a magnetic field of the compound obtained by mixing and granulating the thermoplastic resin.
ンパウンドを成形した後、キュアーして作成したボンド
磁石。5. A bond magnet produced by molding the compound obtained by mixing the thermosetting resin and granulating the compound and then curing the compound.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6215089A JPH0878219A (en) | 1994-09-08 | 1994-09-08 | Compound and bonded magnet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6215089A JPH0878219A (en) | 1994-09-08 | 1994-09-08 | Compound and bonded magnet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0878219A true JPH0878219A (en) | 1996-03-22 |
Family
ID=16666575
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6215089A Pending JPH0878219A (en) | 1994-09-08 | 1994-09-08 | Compound and bonded magnet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0878219A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006179617A (en) * | 2004-12-21 | 2006-07-06 | Yaskawa Electric Corp | Permanent magnet and manufacturing method thereof |
| JP2007019419A (en) * | 2005-07-11 | 2007-01-25 | Neomax Co Ltd | Method for manufacturing rare earth bond magnet |
-
1994
- 1994-09-08 JP JP6215089A patent/JPH0878219A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006179617A (en) * | 2004-12-21 | 2006-07-06 | Yaskawa Electric Corp | Permanent magnet and manufacturing method thereof |
| JP4518935B2 (en) * | 2004-12-21 | 2010-08-04 | 株式会社安川電機 | Permanent magnet and method for manufacturing the same |
| JP2007019419A (en) * | 2005-07-11 | 2007-01-25 | Neomax Co Ltd | Method for manufacturing rare earth bond magnet |
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