JPH0243325B2 - - Google Patents
Info
- Publication number
- JPH0243325B2 JPH0243325B2 JP60227673A JP22767385A JPH0243325B2 JP H0243325 B2 JPH0243325 B2 JP H0243325B2 JP 60227673 A JP60227673 A JP 60227673A JP 22767385 A JP22767385 A JP 22767385A JP H0243325 B2 JPH0243325 B2 JP H0243325B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic field
- powder
- die
- rare earth
- magnet
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Landscapes
- Powder Metallurgy (AREA)
- Manufacturing Cores, Coils, And Magnets (AREA)
Description
〔産業上の利用分野〕
本発明は、円筒状の希土類コバルト磁石におい
て、外周面に複数の磁極を有する多極磁石の磁場
中成型方法に関するものであり、特に、RCo5系
又はR2Co17系希土類コバルト磁石で、外径寸法
が小さく、プレス時の配向磁場が十分に得られな
い場合の粉末配向方法に係わる。
〔従来技術と発明が解決すべき問題点〕
希土類コバルト磁石による第２図の様な円筒状
の径方向多極磁石は、高効率が得られるため、小
型化が可能である。従つて磁石外径としては、12
mm以下がユーザーから要求とされている。
従来この種の磁石は、小型であるため、希土類
コバルト磁石磁場プレス用装置は第１図に示すも
のが使用される。この装置は、ダイ１と中芯２か
ら構成された金型内部に希土類コバルト磁石粉末
３を充填し、コイル４により配向磁場が印加さ
れ、ポールピース５の先端より磁場を発生させ、
粉末を配向させた後図示してない上パンチ、下パ
ンチでダイの軸方向から加圧し、多極に配向され
たプレス体を製造し、焼成後最終寸法に加工さ
れ、着磁後製品となる。この様にして得られる磁
石は、外径寸法が小さくなる程ポールピース５か
ら発生する磁場が小さくなる為、十分な配向が得
られず特性が低く、極間のバラツキも大きくな
る。
また、弱磁場で容易に配向可能な方法として、
第３図に示す様に、粉末を金型内部に充填後、電
磁石６にて強磁場で粉末を着磁した後、多極用電
磁石７にて配向する製造装置が知られているが、
この場合上パンチ８、下パンチ９を非磁性とする
必要があるため、着磁用コイル６は大きくなり、
設備費用も高価となる。
したがつて本発明は、希土類コバルト磁石によ
る径方向多極磁石を製造する場合において、弱磁
界中にて粉末を容易に配向させる方法を提供する
ものである。
〔問題点を解決するための手段〕
本発明によれば、希土類コバルト磁石で径方向
多極を有した磁石を製造する装置において、磁場
中プレス成型を行なう場合、使用する粉末をあら
かじめ強磁場にて着磁した後プレス体とし、その
プレス体を逆磁界で消磁後−20メツシユに解砕し
たものを使用し、弱磁界中で容易に配向が可能な
ことを特徴とする希土類コバルト磁石の製造方法
が得られる。
上記の製造方法によれば、各極（Ｎ、Ｓ）の配
向度が上がり、マグネツト外周面の表面磁束密度
Bo〔Ｇ〕が向上すると同時に、各極間のバラツキ
[Industrial Application Field] The present invention relates to a method for molding a multipolar cylindrical rare earth cobalt magnet having a plurality of magnetic poles on its outer peripheral surface in a magnetic field, and particularly relates to a method for forming a multipolar magnet having a plurality of magnetic poles on the outer peripheral surface in a magnetic field . This invention relates to a method for orienting powder when a rare earth cobalt magnet has a small outer diameter and a sufficient orienting magnetic field cannot be obtained during pressing. [Problems to be solved by the prior art and the invention] A cylindrical radial multipolar magnet made of rare earth cobalt magnets as shown in FIG. 2 has high efficiency and can therefore be miniaturized. Therefore, the outer diameter of the magnet is 12
mm or less is requested by users. Conventionally, this type of magnet is small, so a device for magnetic field pressing of rare earth cobalt magnets as shown in FIG. 1 is used. In this device, rare earth cobalt magnet powder 3 is filled inside a mold consisting of a die 1 and a core 2, an orienting magnetic field is applied by a coil 4, and a magnetic field is generated from the tip of a pole piece 5.
After the powder is oriented, pressure is applied from the axial direction of the die using an upper punch and a lower punch (not shown) to produce a multi-pole oriented pressed body, which is processed to the final dimensions after firing and becomes a magnetized product. . In the magnet obtained in this way, as the outer diameter becomes smaller, the magnetic field generated from the pole piece 5 becomes smaller, so that sufficient orientation cannot be obtained, the characteristics are poor, and the variation between the poles becomes large. In addition, as a method that allows easy orientation in a weak magnetic field,
As shown in FIG. 3, a manufacturing apparatus is known in which powder is filled into a mold, magnetized by an electromagnet 6 in a strong magnetic field, and then oriented by a multipolar electromagnet 7.
In this case, the upper punch 8 and lower punch 9 need to be non-magnetic, so the magnetizing coil 6 becomes larger.
Equipment costs are also high. Therefore, the present invention provides a method for easily orienting powder in a weak magnetic field when producing a radially multipolar magnet using a rare earth cobalt magnet. [Means for Solving the Problems] According to the present invention, when performing press molding in a magnetic field in an apparatus for manufacturing rare earth cobalt magnets having multiple radial poles, the powder to be used is exposed to a strong magnetic field in advance. Manufacture of a rare earth cobalt magnet characterized by being easily oriented in a weak magnetic field, using a pressed body that is magnetized by magnetization and then crushed into -20 mesh after demagnetizing the pressed body in a reverse magnetic field. method is obtained. According to the above manufacturing method, the degree of orientation of each pole (N, S) increases, and the surface magnetic flux density on the outer peripheral surface of the magnet increases.
At the same time Bo[G] improves, the variation between each pole
以下実施例により本発明の説明をする。この実
施例では製品形状をφ8×φ3.5×10として、第２
図に示すような径方向６極用製造装置を使用し
た。また、粉末はSmCo5系で、20kOeの磁場が発
生する垂直磁場プレス機で着磁しプレス成型後、
解砕した粉末を使用した。この粉末を前記の装置
に入れ、多極電磁石に通電して粉末を径方向に放
射状に配向させたあと軸方向から加圧してプレス
成型し、このあとプレス体を焼成して径方向６極
磁石が得られる。この磁石の表面Bo〔Ｇ〕値及び
極間バラツキは表１に示す通りであり、表面Bo
値で250〔Ｇ〕、極間バラツキで６％の改善が得ら
れた。
The present invention will be explained below with reference to Examples. In this example, the product shape is φ8×φ3.5×10, and the second
A manufacturing device for six radial poles as shown in the figure was used. In addition, the powder is SmCo 5 -based and is magnetized using a vertical magnetic field press machine that generates a magnetic field of 20 kOe, and after press molding,
The crushed powder was used. This powder is put into the above-mentioned device, and the multi-pole electromagnet is energized to orient the powder radially in the radial direction, and then press-molded by applying pressure from the axial direction.Then, the pressed body is fired to form a radial six-pole magnet. is obtained. The surface Bo[G] value and the variation between poles of this magnet are shown in Table 1.
An improvement of 250 [G] in value and 6% improvement in variation between electrodes was obtained.
以上説明してきた様に、本発明によれば弱磁界
中で粉末の配向が容易にできる様になつた。本製
造方法により製造した小型径方向多極希土類コバ
ルト磁石は、超小型モーター、アクチユエーター
に組み込むことにより、消費電力が少なく、より
高効率化でき、産業上寄与する効果は大きい。
As explained above, according to the present invention, powder can be easily oriented in a weak magnetic field. By incorporating the small radial multipolar rare earth cobalt magnet manufactured by this manufacturing method into an ultra-small motor or actuator, it consumes less power and can be made more efficient, making a significant contribution to industry.
第１図は希土類コバルト磁石における径方向多
極磁石製造装置を説明するための図、第２図は径
方向多極磁石の説明図、第３図は従来法の一例を
説明するための図である。
記号の説明：１はダイ、２は中芯、３は粉末、
４はコイル、５はポールピースをそれぞれあらわ
している。
Figure 1 is a diagram for explaining a radial multipolar magnet manufacturing apparatus for rare earth cobalt magnets, Figure 2 is a diagram for explaining a radial multipolar magnet, and Figure 3 is a diagram for explaining an example of a conventional method. be. Symbol explanation: 1 is die, 2 is core, 3 is powder,
4 represents a coil, and 5 represents a pole piece.
Claims (1)
極とが交互となる様に多極電磁石を配し、そのダ
イの内部に希土類磁石粉末を充填し、多極電磁石
を通電して粉末を径方向へ放射状に配向させた
後、ダイ内部の粉末をダイの軸方向から加圧して
プレス成型する工程において、ダイ内部に充填す
る希土類コバルト磁石粉末として、あらかじめ強
磁界中で着磁しプレス成型した後逆磁界で消磁し
解砕した磁石粉末を使用し、これにより弱磁界中
で粉末の配向を容易にしたことを特徴とする希土
類コバルト磁石の磁場中成型方法。1 Along the outer circumferential surface of the cylindrical mold die, the N pole and S
A multi-pole electromagnet is arranged so that the poles alternate, and the inside of the die is filled with rare earth magnet powder. After energizing the multi-pole electromagnet and orienting the powder radially in the radial direction, the powder inside the die is In the process of press molding by applying pressure from the axial direction of the die, the rare earth cobalt magnet powder filled inside the die is magnet powder that has been magnetized in a strong magnetic field, press molded, demagnetized in a reverse magnetic field, and crushed. A method for molding rare earth cobalt magnets in a magnetic field, which is characterized in that the orientation of the powder is facilitated in a weak magnetic field.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22767385A JPS6288312A (en) | 1985-10-15 | 1985-10-15 | Forming method for rare earth cobalt magnet in magnetic field |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22767385A JPS6288312A (en) | 1985-10-15 | 1985-10-15 | Forming method for rare earth cobalt magnet in magnetic field |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6288312A JPS6288312A (en) | 1987-04-22 |
| JPH0243325B2 true JPH0243325B2 (en) | 1990-09-28 |
Family
ID=16864536
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22767385A Granted JPS6288312A (en) | 1985-10-15 | 1985-10-15 | Forming method for rare earth cobalt magnet in magnetic field |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6288312A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0628213B2 (en) * | 1987-10-28 | 1994-04-13 | 富士電気化学株式会社 | Bonded magnet manufacturing method |
| JP4839899B2 (en) * | 2006-03-13 | 2011-12-21 | 住友金属鉱山株式会社 | Resin-bonded magnet composition, magnetic anisotropic bonded magnet using the same, and method for producing the same |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5120593A (en) * | 1974-08-13 | 1976-02-18 | Matsushita Electric Industrial Co Ltd | |
| JPS5731108A (en) * | 1980-08-01 | 1982-02-19 | Hitachi Metals Ltd | Manufacture of cylindrical anisotropic permanent magnet |
| JPS57128909A (en) * | 1981-02-03 | 1982-08-10 | Tohoku Metal Ind Ltd | Manufacture of permanent magnet having a plurality of radial magnetic dipoles |
-
1985
- 1985-10-15 JP JP22767385A patent/JPS6288312A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6288312A (en) | 1987-04-22 |
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