JPH027506A - Method of filling space with permanent magnet powder - Google Patents
Method of filling space with permanent magnet powderInfo
- Publication number
- JPH027506A JPH027506A JP15850088A JP15850088A JPH027506A JP H027506 A JPH027506 A JP H027506A JP 15850088 A JP15850088 A JP 15850088A JP 15850088 A JP15850088 A JP 15850088A JP H027506 A JPH027506 A JP H027506A
- Authority
- JP
- Japan
- Prior art keywords
- permanent magnet
- molding space
- magnet powder
- powder
- solenoid coil
- 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.)
- Granted
Links
- 239000000843 powder Substances 0.000 title claims abstract description 67
- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000000465 moulding Methods 0.000 claims abstract description 53
- 239000011347 resin Substances 0.000 claims description 3
- 229920005989 resin Polymers 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000000748 compression moulding Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000000696 magnetic material Substances 0.000 description 2
- 229910000938 samarium–cobalt magnet Inorganic materials 0.000 description 2
- 229920000742 Cotton Polymers 0.000 description 1
- QJVKUMXDEUEQLH-UHFFFAOYSA-N [B].[Fe].[Nd] Chemical compound [B].[Fe].[Nd] QJVKUMXDEUEQLH-UHFFFAOYSA-N 0.000 description 1
- 229910000828 alnico Inorganic materials 0.000 description 1
- KPLQYGBQNPPQGA-UHFFFAOYSA-N cobalt samarium Chemical compound [Co].[Sm] KPLQYGBQNPPQGA-UHFFFAOYSA-N 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 210000003746 feather Anatomy 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910001172 neodymium magnet Inorganic materials 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Landscapes
- Manufacturing Cores, Coils, And Magnets (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野〕
本発明は、金型の成形空間の開口近傍にソレノイドコイ
ルを設置し、交流磁場を印加することによって永久磁石
粉体を短時間で均一に成形空間内に充填する方法に関す
るものである。[Detailed Description of the Invention] [Field of Industrial Application] The present invention provides a solenoid coil near the opening of the molding space of a mold, and applies an alternating magnetic field to uniformly spread permanent magnet powder in a short time. The present invention relates to a method of filling a molding space.
［従来の技術］
永久磁石粉体の成形には、良好な磁気特性を発現させる
ため、通常、金型の成形空間内に永久磁石粉体を充填し
プレス成形機で圧縮成形する方法が採用されている。[Prior art] In order to develop good magnetic properties, the molding of permanent magnet powder usually involves filling the molding space of a mold with permanent magnet powder and compression molding it with a press molding machine. ing.
圧縮成形において、金型成形空間内への永久磁石粉体の
充填は専ら重力による自然落下を利用して行われる。つ
まり金型を構成するダイスの上面をスライドする無底の
粉体供給機構によって粉体を成形空間の開口部から自然
落下させて充填し、粉体供給機構をスライドさせて余分
な粉体を取り除く摺切り方式で一定量の粉体を金型の成
形空間内に充填する方法が一般的である。In compression molding, permanent magnet powder is filled into the molding space using natural falling due to gravity. In other words, a bottomless powder supply mechanism that slides on the top surface of the die that makes up the mold fills the molding space by letting it fall naturally from the opening, and the powder supply mechanism is slid to remove excess powder. A common method is to fill the molding space of a mold with a certain amount of powder using a sliding method.
金型成形空間の開口面積がかなり大きいものについては
このような方法によって充填可能であるが、前記開口部
の面積や幅が小さい場合には、単に粉体供給機構を金型
上面に沿ってスライドさせるだけでは十分な充填は困難
である。If the opening area of the mold forming space is quite large, it can be filled using this method, but if the area or width of the opening is small, the powder supply mechanism can be simply slid along the top surface of the mold. It is difficult to fill the liquid sufficiently by simply letting the liquid flow.
そのため金型に微振動を加えて充填する方法や成形空間
の上部に強制充填用の羽ｍ＜押し込み用部材）を設けて
強制的に粉体を押し込む方法等が採られることもある。For this reason, a method of filling the mold by applying slight vibrations or a method of forcibly pushing the powder by providing a forced filling feather m<pushing member) above the molding space may be adopted.
［発明が解決しようとする課題］
金型に微振動を加えて充填する方法は、粉体の状態や形
状によって充填率が変化し昌いこと、振動を与えるため
装置のボルト等の締め付けが緩くなる戊れがあること、
充填効率はあまり改善されず、充填量の再現性も悪いこ
と等の欠点があった。[Problems to be solved by the invention] The method of filling a mold by applying slight vibrations has the disadvantage that the filling rate changes depending on the state and shape of the powder, and that the vibrations cause the bolts of the device to be loosely tightened. There is a gap,
There were drawbacks such as not much improvement in filling efficiency and poor reproducibility of filling amount.
また羽根を用いて強制充填する方法では、充填に要する
時間が非常に長くががるばがりでなくプレス工程におけ
る粉体充填の自動化が困難で製造効率が極めて悪いこと
、また羽根によって強制的に押し込まれるため充填され
た粉体の形状が以前（充填前）の形状と異なる部分が局
所的に発生し、そのため均一定量充填が困難で成形時に
重量のばらつきや密度分布の不均一等が生じる問題があ
ること等の欠点があった。In addition, the method of forced filling using blades not only takes a very long time to fill, but also makes it difficult to automate powder filling in the press process, resulting in extremely poor manufacturing efficiency. Because the powder is pushed in, the shape of the filled powder differs locally from the previous shape (before filling), which makes it difficult to fill uniformly and quantitatively, leading to variations in weight and uneven density distribution during molding. There were drawbacks such as:
本発明の目的は、上記のような従来技術の欠点を解消し
、例え金型の成形空間の開口面積が小さかったり開口部
の幅が狭くても永久磁石粉体を捲く短時間で均一に一定
量前記成形空間内に充填でき、それによって良好な磁気
特性の永久磁石を製造できるし、しかも既存のプレス成
形機にも直ちに適用できるような永久磁石粉体の充填方
法を提供することにある。The purpose of the present invention is to eliminate the above-mentioned drawbacks of the conventional technology, and even if the opening area of the molding space of the mold is small or the width of the opening is narrow, the permanent magnet powder can be rolled evenly and uniformly in a short time. It is an object of the present invention to provide a method for filling permanent magnet powder which can be filled into the molding space, thereby producing a permanent magnet with good magnetic properties, and which can be immediately applied to an existing press molding machine.
［課題を解決するための手段］
上記のような目的を達成することのできる本発明は、金
型の成形空間の開口近傍にソレノイドコイルを、その中
心軸方向が成形空間深さ方向にほぼ一致する向きに設置
し、交流電流を供給して前記開口上方の永久磁石粉体を
前記成形空間内に磁気的に吸引し充填することを特徴と
する永久磁石粉体の充填方法′である。[Means for Solving the Problems] The present invention, which can achieve the above objects, includes a solenoid coil in the vicinity of the opening of the molding space of the mold, the central axis direction of which substantially coincides with the depth direction of the molding space. This is a method for filling permanent magnet powder, characterized in that the permanent magnet powder above the opening is magnetically attracted and filled into the molding space by supplying alternating current.
ここでソレノイドコイルは空心型であってもよいが、よ
り好ましくは内部に磁性ボールを有する構造とする０本
発明方法では、希土類系、フェライト系、アルニコ系、
或いはネオジウム−鉄−ポロン系等の任意の永久磁石粉
体を使用できるし、また任意の粒径或いは状態の粉体で
も適用可能である。従って焼結磁石用の粉体であっても
よいし、樹脂と混練したボンド磁石用の粉体であっても
よい。Here, the solenoid coil may be of an air-core type, but more preferably has a structure having a magnetic ball inside.
Alternatively, any permanent magnet powder such as neodymium-iron-poron powder can be used, and powder of any particle size or state can also be used. Therefore, it may be a powder for sintered magnets or a powder for bonded magnets kneaded with resin.
［作用］
周知のように、成る一定の保磁力をもった永久磁石粉体
は磁場によって敏感に反応する。そしてこれらの永久磁
石粉体は当然のことながら強力な磁場方向へ吸引される
性質を持つ、金型の成形空間の開口近傍に中心軸が成形
空間深さ方向にほぼ一致するような向きでソレノイドコ
イルを設置し交流電流を供給すると、交流磁場が印加さ
れそれによって永久磁石粉体に移動力が与えられる。こ
の移動力は永久磁石粉体を成形空間内に吸引さ廿る方向
に働き、永久磁石粉体は前記空間内に順次充填てされて
いくことになる。この充填は自然画下等による力よりも
遥かに大きな磁気的吸引力によって行われるため、金型
の成形空間の開口面積が小さかったり開口部の幅が極端
に狭い場合であっても掻く短時間でスムーズに行われる
。しかも従来の羽根等による強制充填とは異なり、永久
磁石粉体は殆ど壊れずにほぼ均一に充填される。[Operation] As is well known, permanent magnet powder having a certain coercive force reacts sensitively to magnetic fields. These permanent magnet powders naturally have the property of being attracted in the direction of a strong magnetic field, so a solenoid is installed near the opening of the molding space of the mold in an orientation such that its central axis almost coincides with the depth direction of the molding space. When the coil is installed and an alternating current is supplied, an alternating magnetic field is applied, which gives a moving force to the permanent magnet powder. This moving force acts in a direction to attract the permanent magnet powder into the molding space, and the permanent magnet powder is sequentially filled into the space. This filling is performed using a magnetic attraction force that is much larger than the force generated by natural painting, so even if the opening area of the molding space of the mold is small or the width of the opening is extremely narrow, it can be filled in a short time. is carried out smoothly. Moreover, unlike conventional forced filling using blades or the like, the permanent magnet powder is filled almost uniformly with almost no breakage.
［実施例〕
第１図は本発明方法を実施するのに好適な装置の一例を
示す説明図である。これは円筒状或いはリング状の成形
体を得るための金型の一部を示している。中央に円形の
穴を有するダイス１０と、その中心に間隙をおいて配置
される下ロッド１２と、前記ダイス１０と下ロッド１２
との円筒状の間隙内を上下方向に摺動自在の円筒状下バ
ンチ１４とを具備している。それら王者によって形成さ
れる円筒状の空隙が成形空間１８を構成する。その成形
空間１８内に永久磁石粉体を充填し、上方から円筒状の
上パンチ（図示せず）を挿入加圧して圧縮成形を行う。[Example] FIG. 1 is an explanatory diagram showing an example of an apparatus suitable for carrying out the method of the present invention. This shows a part of a mold for obtaining a cylindrical or ring-shaped molded body. A die 10 having a circular hole in the center, a lower rod 12 arranged with a gap in the center thereof, and the die 10 and the lower rod 12.
The cylindrical lower bunch 14 is slidable vertically within the cylindrical gap between the cylindrical lower bunch 14 and the cylindrical lower bunch 14. The cylindrical void formed by these kings constitutes the molding space 18. The molding space 18 is filled with permanent magnet powder, and a cylindrical upper punch (not shown) is inserted from above and pressurized to perform compression molding.
このようなプレス成形機金型構造は基本的には従来の場
合と同様である。The mold structure of such a press molding machine is basically the same as that of the conventional case.
本発明では、金型の成形空間１８の開口近傍にソレノイ
ドコイル２０を配置する。このソレノイドコイル２０は
、その中実軸方向が成形空間１８の深さ方向にほぼ一致
する向きとする。In the present invention, the solenoid coil 20 is arranged near the opening of the molding space 18 of the mold. The solenoid coil 20 is oriented so that its solid axis direction substantially coincides with the depth direction of the molding space 18.
ここではソレノイドコイル２０は、その内径が成形空間
１８の外径よりもやや大きく、中央の下パンチ１４上に
その直径と同等若しくはそれ以下の直径の円柱状磁性ボ
ール２２を設けている。Here, the solenoid coil 20 has an inner diameter slightly larger than the outer diameter of the molding space 18, and a cylindrical magnetic ball 22 having a diameter equal to or smaller than the diameter of the solenoid coil 20 is provided on the lower punch 14 in the center.
なおこの実施例では、金型構成する部材のうちダイス１
０と下ロッド１２は磁性材で構成し、下パンチ１４（上
パンチも）は非磁性材で構成している。In this embodiment, among the members constituting the mold, die 1
0 and the lower rod 12 are made of magnetic material, and the lower punch 14 (also the upper punch) is made of non-magnetic material.
永久磁石粉体の充填は同図に示すようにして行う、金型
の成形空間１Ｂの開口近傍に前記のようにソレノイドコ
イル２０及び磁性ボール２２を設置し、成形空間１８の
上方に永久磁石粉体２４を盛る。そしてソレノイドコイ
ル２０に交流電流を供給する。使用する交流電流の周波
数については特に制限はないが、通常の商用周波数であ
ってよい、ソレノイドコイル２０に交流電流を流すこと
によって、同図破線で示すように交流磁力線が生じ、永
久磁石粉体２４及び成形空間１８内等に交流磁場が形成
される。The filling of permanent magnet powder is carried out as shown in the figure.The solenoid coil 20 and magnetic balls 22 are installed as described above near the opening of the molding space 1B of the mold, and the permanent magnet powder is filled above the molding space 18. Add body 24. Then, alternating current is supplied to the solenoid coil 20. There is no particular restriction on the frequency of the alternating current to be used, but it may be a normal commercial frequency. By passing an alternating current through the solenoid coil 20, alternating current magnetic lines of force are generated as shown by the broken line in the figure, and the permanent magnet powder is An alternating magnetic field is formed within the molding space 24 and the molding space 18 .
磁力線の形状は金型構成部材の材質（磁性材か非磁性材
か）によって変化するが、便宜的におおよその経路を表
しである。この交流磁場によって成形空間１８の上部に
盛られた永久磁石粉体２４はその内部に磁気的に吸引さ
れ、前記交流磁場に反応して複雑な振動を繰り返しなが
ら非常に狭い間隙であっても短時間で充填されてしまう
。Although the shape of the magnetic lines of force changes depending on the material (magnetic or non-magnetic) of the mold component, the approximate path is shown for convenience. Due to this alternating magnetic field, the permanent magnet powder 24 piled up on the upper part of the molding space 18 is magnetically attracted to the inside thereof, and repeats complex vibrations in response to the alternating magnetic field, even if the gap is very narrow. It will fill up in time.
従ってその後必要があれば余分な永久磁石粉体を摺切り
法等によって取り除き、上パンチを降下させ加圧して圧
縮成形を行う。Therefore, if necessary thereafter, excess permanent magnet powder is removed by a sliding method or the like, and compression molding is performed by lowering the upper punch and applying pressure.
前記のように本実施例ではソレノイドコイル２０の中心
に磁性ボール２２を配置している。As described above, in this embodiment, the magnetic ball 22 is arranged at the center of the solenoid coil 20.
磁性ボール２２を設けると、それによって成形空間１８
に交流磁場を集中させることができ、弱い電流でも永久
磁石粉体２４を前記成形空間１８内に有効に吸引させる
ことができ好ましい。When the magnetic ball 22 is provided, the molding space 18 is thereby
This is preferable because it is possible to concentrate the alternating magnetic field at , and to effectively attract the permanent magnet powder 24 into the molding space 18 even with a weak current.
しかし場合によっては、磁性ボールを用いない空心型ソ
レノイドコイルであってもよいし、別のヨーク構造体を
設けてもよい。However, depending on the case, an air-core solenoid coil that does not use magnetic balls may be used, or another yoke structure may be provided.
次に本発明方法に基づき永久磁石粉体を充填した実験例
について説明する。平均粒径１１０μｍ以下のサマリウ
ム−コバルト系粉体を用い、外径１８５ｍφ、内径１６
蒙■φ、高さ１６ｍ−の円筒状の成形空間内に充填した
。その結果を第１表に示す、なお第１表において従来方
法は、スライド式充填治具に粉体を入れ、ダイス上で往
復運動させることにより上記成形空間内に落下充填する
自然落下方式の場合である。Next, an experimental example in which permanent magnet powder was filled based on the method of the present invention will be explained. Using samarium-cobalt powder with an average particle size of 110 μm or less, the outer diameter is 185 mφ and the inner diameter is 16 mm.
A cylindrical molding space with a diameter of 16 m and a height of 16 m was filled. The results are shown in Table 1. In Table 1, the conventional method is a natural fall method in which the powder is placed in a sliding filling jig and moved back and forth on a die to fall and fill into the molding space. It is.
（以下余白）
第１表
ここで本発明方法Ａはソレノイドコイルの中心に磁性ボ
ールを設置した場合であり、本発明方法Ｂは磁性ボール
のない空心型ソレノイドコイルの場合である。何れの場
合でもほぼ均一な充填量が得られ、また充填時間は極め
て短いことが判る。なかでも中央に磁性ボールを用いる
と空心型ソレノイドコイルの場合に比べて充填時間は更
に短くできる。(Left space below) Table 1 Here, method A of the present invention is a case where a magnetic ball is installed at the center of the solenoid coil, and method B of the present invention is a case of an air-core solenoid coil without a magnetic ball. It can be seen that in either case, a substantially uniform filling amount was obtained and the filling time was extremely short. In particular, if a magnetic ball is used in the center, the filling time can be further shortened compared to the case of an air-core solenoid coil.
それに対して従来方法では、充填時間が長くかかるばか
りでなく成形空間が薄肉であるため粉体が入っていかず
、充填量が少なくばらつきも大きい。On the other hand, in the conventional method, not only does it take a long time to fill the mold, but the molding space is so thin that the powder does not enter, resulting in a small amount of filling and large variations.
本発明における上記のような顕著な効果は主として粉体
の磁気的性質に起因するものであるから、永久磁石粉体
であれば前記サマリウム−コバルト系磁石粉体の他、フ
ェライト系、アルニコ系、或いはネオジウム−鉄−ボロ
ン系等の何れであっても同様の結果が得られる。成形空
間の形状は薄肉円筒状や薄肉板状等の場合に特に有効で
あるが、それ以外の任意の形状の場合にも適用できる。The above-mentioned remarkable effects of the present invention are mainly due to the magnetic properties of the powder, so in the case of permanent magnet powder, in addition to the samarium-cobalt magnet powder, ferrite, alnico, Alternatively, similar results can be obtained with any neodymium-iron-boron system. It is particularly effective when the shape of the molding space is a thin cylinder or a thin plate, but it can also be applied to any other shape.
焼結磁石用の粉体のみならずボンド磁石用の粉体（樹脂
と混練した粉体）にも適用できることは言うまでもない
。Needless to say, the present invention can be applied not only to powder for sintered magnets but also to powder for bonded magnets (powder kneaded with resin).
［発明の効果］
本発明は上記のように金型の成形空間の開口近傍に中心
軸方向が成形空間深さ方向にほぼ一致する向きにソレノ
イドコイルを設置し、それによって交流磁場を印加する
ように構成した永久磁石粉体の充填方法だから、永久磁
石粉体に磁気的吸引力が働き成形空間の開口面積が小さ
い場合や開口部が極端に狭いような場合でもその磁気的
吸引力によって永久磁石粉体を迅速に該成形空間内に充
填でき、永久磁石を非常に効率よく成形できる点で甚だ
優れた効果を有するものである。[Effects of the Invention] As described above, the present invention provides a method in which a solenoid coil is installed in the vicinity of the opening of the molding space of a mold in a direction in which the central axis direction substantially coincides with the depth direction of the molding space, thereby applying an alternating magnetic field. Because of the method of filling permanent magnet powder configured in This method has extremely excellent effects in that the powder can be quickly filled into the molding space and the permanent magnet can be molded very efficiently.
しかも永久磁石粉体を強制的に機械的に押し込むのでは
なく磁気的吸引力によって充填するため、元の粉体の形
状がそのまま保たれ、そのため密度分布が均一で成形体
重量も一定となり、特性の揃った永久磁石を量産できる
。更に本発明は金型上部にソレノイドコイルを設置する
だけであるから、既存のどのような形態のプレス成形機
にも適用可能であり、粉体の粒径や状態等に関わりな（
永久磁石を製造する様々な分野で使用可能である。Moreover, since the permanent magnet powder is filled by magnetic attraction rather than forced mechanically, the original shape of the powder is maintained, resulting in a uniform density distribution and a constant molded weight, resulting in characteristics We can mass-produce permanent magnets with a complete set of characteristics. Furthermore, since the present invention only requires installing a solenoid coil at the top of the mold, it can be applied to any type of existing press molding machine, regardless of the particle size or condition of the powder.
It can be used in various fields of manufacturing permanent magnets.
第１図は本発明方法で用いる成形用金型並びに充填用ソ
レノイドコイルと交流磁力綿を示す説明図である。
１０・・・ダイス、１２・・・下ロンド、１４・・・下
パンチ、１８・・・成形空間、２０・・・ソレノイドコ
イル、２２・・・磁性ポール、２４・・・永久磁石粉体
。FIG. 1 is an explanatory diagram showing a molding die, a filling solenoid coil, and AC magnetic cotton used in the method of the present invention. DESCRIPTION OF SYMBOLS 10... Dice, 12... Lower rond, 14... Lower punch, 18... Molding space, 20... Solenoid coil, 22... Magnetic pole, 24... Permanent magnet powder.
Claims (5)
その中心軸方向が成形空間深さ方向にほぼ一致する向き
に設置し、交流電流を供給して前記開口上方の永久磁石
粉体を前記成形空間内に充填することを特徴とする永久
磁石粉体の充填方法。1. A solenoid coil is installed near the opening of the molding space of the mold.
Permanent magnet powder, characterized in that the central axis direction thereof is installed in a direction that substantially coincides with the depth direction of the molding space, and the permanent magnet powder above the opening is filled into the molding space by supplying an alternating current. filling method.
記載の充填方法。2. Claim 1: A magnetic pole is provided in the solenoid coil.
Filling method as described.
請求項１記載の充填方法。3. The filling method according to claim 1, wherein the solenoid coil is an air-core solenoid coil.
載の充填方法。4. 2. The filling method according to claim 1, wherein the permanent magnet powder is powder for sintered magnets.
である請求項１記載の充填方法。5. 2. The filling method according to claim 1, wherein the permanent magnet powder is powder for bonded magnets kneaded with resin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15850088A JPH027506A (en) | 1988-06-27 | 1988-06-27 | Method of filling space with permanent magnet powder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15850088A JPH027506A (en) | 1988-06-27 | 1988-06-27 | Method of filling space with permanent magnet powder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH027506A true JPH027506A (en) | 1990-01-11 |
| JPH0477449B2 JPH0477449B2 (en) | 1992-12-08 |
Family
ID=15673093
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15850088A Granted JPH027506A (en) | 1988-06-27 | 1988-06-27 | Method of filling space with permanent magnet powder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH027506A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6126205A (en) * | 1984-07-13 | 1986-02-05 | Matsushita Electric Works Ltd | Manufacture of rare earth magnet |
-
1988
- 1988-06-27 JP JP15850088A patent/JPH027506A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6126205A (en) * | 1984-07-13 | 1986-02-05 | Matsushita Electric Works Ltd | Manufacture of rare earth magnet |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0477449B2 (en) | 1992-12-08 |
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