JPH07101657B2 - Bonded magnet manufacturing method - Google Patents
Bonded magnet manufacturing methodInfo
- Publication number
- JPH07101657B2 JPH07101657B2 JP62272095A JP27209587A JPH07101657B2 JP H07101657 B2 JPH07101657 B2 JP H07101657B2 JP 62272095 A JP62272095 A JP 62272095A JP 27209587 A JP27209587 A JP 27209587A JP H07101657 B2 JPH07101657 B2 JP H07101657B2
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- Prior art keywords
- magnetic field
- powder
- mold
- granulated powder
- filled
- Prior art date
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Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は、樹脂を用いて永久磁石粉体を結合するボンド
磁石の製造方法に関し、更に詳しくは、交流磁場によっ
て造粒粉を短時間で均一に金型内に充填し圧縮成形する
ボンド磁石の製造方法に関するものである。Description: TECHNICAL FIELD The present invention relates to a method for producing a bonded magnet in which a permanent magnet powder is bonded using a resin, and more specifically, the granulated powder can be formed in a short time by an alternating magnetic field. The present invention relates to a method for manufacturing a bonded magnet in which a mold is uniformly filled and compression-molded.
［従来の技術］ 永久磁石粉体を高分子樹脂により結合させたボンド磁石
は従来公知である。この種ののボンド磁石は、永久磁石
粉体とエポキシ樹脂等の高分子樹脂とを混合し、それを
所定形状に成形することによって製造される。成形に
は、良好な磁気特性を発現させるため、通常、金型内に
前記混合物を充填しプレス機で圧縮する圧縮成形法が採
用されている。[Prior Art] A bonded magnet in which permanent magnet powder is bonded with a polymer resin is conventionally known. This type of bond magnet is manufactured by mixing a permanent magnet powder and a polymer resin such as an epoxy resin and molding the mixture into a predetermined shape. For the molding, a compression molding method in which a mold is filled with the mixture and the mixture is compressed by a pressing machine is usually employed in order to exhibit good magnetic properties.
この成形において、金型内への造粒粉の充填は、ダイス
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
金型開口部から自然落下させ、粉体供給機構をスライド
させて摺切り方式で一定量の粉体を金型中に充填する方
法が一般的である。In this molding, the granulated powder is filled in the mold by allowing the powder to naturally fall from the mold opening by the bottomless powder supply mechanism that slides on the upper surface of the die and slide the powder supply mechanism to slide. A method of filling a certain amount of powder in a mold by a cutting method is generally used.
ところが金型開口部の面積や幅がかなり小さいものにつ
いては、そのような自然落下による粉体供給は非常に困
難であり、やむを得ず上方から押し棒等で粉体を押し込
んで強制的に落下充填させる方法が取られる。However, if the area and width of the die opening are quite small, it is very difficult to supply the powder by such a natural fall, and it is unavoidable that the powder is forced from above by a push rod or the like to force it to fall and fill. The method is taken.
［発明が解決しようとする問題点］ 金型開口面積が小さかったり開口部の幅が狭い場合に、
上方から押し棒等を利用して粉体を強制的に充填する方
法では、金型に充填した時に粉体の形状が以前の形状と
異なる部分が発生し、そのため均一定量充填が困難で密
度分布が生じる問題がある。また操作が面倒なため粉体
充填に要する時間が非常に長くかかり、製造効率が悪い
欠点があった。[Problems to be Solved by the Invention] When the die opening area is small or the opening width is narrow,
In the method of forcibly filling the powder from above by using a push rod, etc., the shape of the powder is different from the previous shape when it is filled in the mold, which makes uniform quantitative filling difficult and the density distribution There is a problem that occurs. Further, since the operation is troublesome, it takes a very long time to fill the powder, and there is a drawback that the manufacturing efficiency is poor.
特に成形時に配向用磁場を印加して異方性磁石を製造す
るような場合には、極端に密度の高い部分では磁場によ
る配向が困難となり、特性の減少を来すこともある。In particular, when an anisotropic magnet is manufactured by applying an orientation magnetic field at the time of molding, the orientation due to the magnetic field becomes difficult in a portion having extremely high density, and the characteristics may be reduced.
本発明の目的は、上記のような従来技術の欠点を解消
し、永久磁石粉体と樹脂とを混合した造粒粉を極く短時
間で金型内に均一に一定量供給でき、それによって品質
が安定し磁気特性に優れたボンド磁石を効率よく製造で
きるような方法を提供することにある。The object of the present invention is to eliminate the drawbacks of the prior art as described above, and to uniformly supply a fixed amount of granulated powder obtained by mixing a permanent magnet powder and a resin into a mold in an extremely short time. An object of the present invention is to provide a method capable of efficiently producing a bonded magnet having stable quality and excellent magnetic characteristics.
［問題点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、永
久磁石粉体と樹脂との混合物に造粒処理を施し、その造
粒粉を金型の深さ方向に磁場勾配を持つ交流磁場で金型
内に充填して圧縮成形するボンド磁石の製造方法であ
る。[Means for Solving the Problems] In the present invention that can achieve the above objects, a mixture of a permanent magnet powder and a resin is subjected to a granulation treatment, and the granulated powder is deeply filled in a mold. This is a method of manufacturing a bond magnet in which a mold is filled with an alternating magnetic field having a magnetic field gradient in the vertical direction and compression-molded.
造粒処理は前記混合物を解砕すること、例えばメッシュ
を通すこと、あるいは高速回転する刃で破砕すること等
により容易に行える。The granulation process can be easily carried out by crushing the mixture, for example, passing it through a mesh, or crushing with a blade rotating at a high speed.
使用する永久磁石粉体としては、希土類系、フェライト
系、アルニコ系、あるいはネオジウム−鉄−ボロン系等
の磁石粉体を使用することができるし、樹脂としてはエ
ポキシ系、フェノール系等が使用可能である。The permanent magnet powder used may be rare earth-based, ferrite-based, alnico-based, or neodymium-iron-boron-based magnet powder, and the resin may be epoxy-based or phenol-based. Is.
金型内に造粒粉を充填する際の磁場は、落下方向程強く
なるように場所によって変化する磁場であれば特に制限
はなく、磁場のかけ方も縦磁場や横磁場、ラジアル磁場
など任意のかけ方でよい。The magnetic field when filling the granulated powder in the mold is not particularly limited as long as it is a magnetic field that changes depending on the place so that it becomes stronger in the falling direction, and the method of applying the magnetic field is arbitrary such as vertical magnetic field, horizontal magnetic field, radial magnetic field, etc. How to put it is good.
本発明は圧縮成形時に配向磁場を印加させて異方性化す
る場合にも適用できるし、成形時には磁場をかけない等
方性磁石の場合にも適用できる。The present invention can be applied to the case where an orientation magnetic field is applied during compression molding to make it anisotropic, and it is also applicable to the case of an isotropic magnet in which no magnetic field is applied during molding.
［作用］ 周知のように、ある一定の保磁力を持った永久磁石粉体
は磁場に敏感に反応する。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。[Operation] As is well known, a permanent magnet powder having a certain coercive force is sensitive to a magnetic field. And, of course, these permanent magnet powders have the property of being attracted in the direction of a strong magnetic field.
金型近傍で強さが場所によって変化する磁場が存在する
と、造粒粉に移動力が与えられる。これが金型の深さ方
向に磁場勾配を持つ交流磁場であれば、造粒粉は金型内
へ入る程磁界が段々強くなり、充填される。この充填は
自然落下による力と磁界による力が加わって行われるた
め、金型開口面積が小さかったり開口部の幅が極端に狭
い場合であっても極く短時間の内にスムーズに行われ、
しかも従来の押し棒による強制充填等とは異なり造粒粉
が殆ど壊れずにほぼ均一に充填される。In the presence of a magnetic field whose strength changes from place to place near the mold, the granulated powder is given a moving force. If this is an alternating magnetic field having a magnetic field gradient in the depth direction of the die, the granulated powder will be gradually filled with the magnetic field as it enters the die. Since this filling is performed by adding the force of natural fall and the force of the magnetic field, even if the mold opening area is small or the width of the opening is extremely narrow, it is smoothly performed in a very short time,
In addition, unlike the conventional forced filling with a push rod, the granulated powder is almost uniformly broken and almost uniformly filled.
その後その金型を利用して圧縮成形することにより、成
形時磁場をかけていれば異方性磁石を、磁場をかけてい
なければ等方性磁石を製造できる。金型への充填が均一
に行われるし、また充填時に造粒粉の破壊が生じないた
め安定した高い特性の永久磁石を製造できる。また造粒
粉が速やかに充填されるため製造効率も著しく向上する
ことになる。After that, by compression molding using the mold, an anisotropic magnet can be manufactured if a magnetic field is applied during molding, and an isotropic magnet can be manufactured if a magnetic field is not applied. Since the mold is uniformly filled and the granulated powder does not break during filling, it is possible to manufacture a stable and stable permanent magnet. Moreover, since the granulated powder is quickly filled, the production efficiency is significantly improved.
［実施例］ 平均粒径1000μｍのサマリウム−コバルト（Sm2Co17）
系合金をジェトミルにより平均粒径３μｍに粉砕し、そ
の粉体を磁場中成形した後に焼結・時効し原料とした。[Example] Samarium-cobalt (Sm 2 Co 17 ) having an average particle size of 1000 μm
The system alloy was crushed with a jet mill to an average particle size of 3 μm, and the powder was molded in a magnetic field and then sintered and aged to obtain a raw material.
この原料焼結体をジョークラッシャーにより粉砕し篩別
して平均粒径100μm,50μm,20μｍの３類の粉体を得、
それらを50:25:25の割合で混合し永久磁石粉体を得た。
この永久磁石粉体にカップリング剤で処理した後、エポ
キシ樹脂と混合した。この混合物を破砕式造粒機で解砕
することにより造粒処理をして平均粒径300〜400μｍの
造粒粉を得た。その造粒粉を用いてラジアル異方性のリ
ング状ボンド磁石を製造した。This raw material sintered body is crushed by a jaw crusher and sieved to obtain three kinds of powders having an average particle size of 100 μm, 50 μm, 20 μm,
They were mixed at a ratio of 50:25:25 to obtain a permanent magnet powder.
This permanent magnet powder was treated with a coupling agent and then mixed with an epoxy resin. The mixture was granulated by crushing with a crushing type granulator to obtain granulated powder having an average particle size of 300 to 400 μm. A ring-shaped bonded magnet having radial anisotropy was manufactured using the granulated powder.
ここで使用した金型並びに磁気回路の構造を第１図に示
す。磁性ダイス10の中央上部には上ロッド12が位置し、
それを取り囲むように上パンチ14と上パンチ支え16が設
けられる。上ロッド12並びに上パンチ支え16は磁性体か
ら構成され、それらとダイス10との間で磁路を形成する
ように磁性ヨーク18a,18b並びに磁性ヨーク20a,20bが設
けられる。そして磁性ヨーク18a,18bにはそれぞれコイ
ル22a,22bが巻装される。ダイス10の下半分もほぼ同様
の構造をなし、下ロッド32、下パンチ34、下パンチ支え
36、磁性ヨーク38a,38b,40a,40b、およびコイル42a,42b
を備えている。これによってダイス10には下パンチ34と
下ロッド32等によって薄肉のリング状成形空間50が形成
され、そこに造粒粉が充填されることになる。The structure of the mold and magnetic circuit used here is shown in FIG. The upper rod 12 is located at the upper center of the magnetic die 10,
An upper punch 14 and an upper punch support 16 are provided so as to surround it. The upper rod 12 and the upper punch support 16 are made of a magnetic material, and magnetic yokes 18a, 18b and magnetic yokes 20a, 20b are provided so as to form a magnetic path between them and the die 10. The coils 22a and 22b are wound around the magnetic yokes 18a and 18b, respectively. The lower half of the die 10 has a similar structure, and supports the lower rod 32, lower punch 34, and lower punch.
36, magnetic yokes 38a, 38b, 40a, 40b, and coils 42a, 42b
Is equipped with. As a result, a thin ring-shaped molding space 50 is formed in the die 10 by the lower punch 34, the lower rod 32, etc., and the granulated powder is filled therein.
造粒粉の充填は第２図に示されているようにリング状成
形空間50の上部に造粒粉52を盛り、コイル22a,22b,42a,
42bで交流磁場を印加することによって行う。なお符号5
4で示す部材は造粒粉の飛散防止用カバーである。As shown in FIG. 2, the granulated powder is filled with granulated powder 52 in the upper part of the ring-shaped molding space 50, and the coils 22a, 22b, 42a,
This is done by applying an alternating magnetic field at 42b. Note that reference numeral 5
The member indicated by 4 is a cover for preventing the scattering of granulated powder.
コイル22a,22bによって発生した磁束は磁性ヨーク18a,1
8b,20a,20bを通り上パンチ支え16で集められ、第２図破
線で示すように上ロッド12並びに下ロッド32を通りダイ
ス10へ流れる。下半分も同様である。ダイス10上に盛ら
れた造粒粉52にこのような交流磁場を加えると、上ロッ
ド12と下ロッド32の間の磁束密度に対してリング状成形
空間50の磁束密度の方が大きく、磁場を印加した時間に
そのような差によって造粒粉がリング状成形空間50内に
吸引される。ダイス10上に残った造粒粉52も交流磁場に
反応して複雑な振動を繰り返し非常に狭い間隙であって
も数秒以内でダイス内に完全に充填される。ここで印加
する磁場0.6〜1kOe程度であり、商用周波数の交流磁場
である。The magnetic flux generated by the coils 22a, 22b is the magnetic yoke 18a, 1
After passing through 8b, 20a and 20b, they are collected by the upper punch support 16 and flow through the upper rod 12 and the lower rod 32 to the die 10 as shown by the broken line in FIG. The same applies to the lower half. When such an alternating magnetic field is applied to the granulated powder 52 piled up on the die 10, the magnetic flux density in the ring-shaped forming space 50 is larger than the magnetic flux density between the upper rod 12 and the lower rod 32, and the magnetic field Due to such a difference, the granulated powder is sucked into the ring-shaped molding space 50 at the time when the voltage is applied. The granulated powder 52 remaining on the die 10 also responds to the alternating magnetic field and repeats complex vibrations, and even within a very narrow gap, the granules 52 are completely filled in the die within a few seconds. The magnetic field applied here is about 0.6 to 1 kOe, which is an AC magnetic field of commercial frequency.
このようにして外径18mmφ，内径16mmφ高さ10mmの金型
中に約1.5gの造粒粉を迅速に充填できた。In this way, about 1.5 g of granulated powder could be quickly filled into a mold with an outer diameter of 18 mmφ and an inner diameter of 16 mmφ and a height of 10 mm.
成形は15kOeの磁場中で配向方向がラジアル状になるよ
うにして3ton/cm2の圧力で行い、その後120℃で２時間
のキュアリング処理を施し、パルス着磁機を用いて20〜
30kOeで24極着磁を行った。Molding is performed in a magnetic field of 15 kOe at a pressure of 3 ton / cm 2 so that the orientation direction becomes radial, and then a curing treatment is performed at 120 ° C. for 2 hours, using a pulse magnetizer for 20-
24 poles were magnetized at 30 kOe.
また比較のために従来法で、すなわち造粒粉を自然落下
と押し棒による強制圧入を併用して金型内へ充填し、同
様の手順で成形しラジアル異方性リング状ボンド磁石を
製造した。For comparison, the conventional method, that is, the granulated powder was filled in the mold by gravity dropping and forced press fitting with a push rod, and molded in the same procedure to manufacture a radial anisotropic ring-shaped bonded magnet. .
得られたボンド磁石の物理的特性並びに金型内への充填
に要する時間の測定結果を第１表に示す。Table 1 shows the physical properties of the obtained bonded magnet and the measurement results of the time required for filling the mold in the mold.
この結果から明らかなように、本発明方法では表面磁束
のばらつきが非常に小さく製品の高密度化が図られ、表
面磁束の値も非常に大きくなり、総磁束も従来品よりも
10〜15％程度向上することが判る。これは本発明では金
型内の造粒粉の形状が当初の（充填前の）形状と同等で
局部的に崩れている部分がなく、均一な密度分布が実現
でき所定の磁場でも十分な配向がなされるためである。
また充填時間の欄を見れば明らかなように、本発明方法
では従来技術に比べ問題にならないほど短時間で充填が
完了する。 As is clear from this result, in the method of the present invention, the variation of the surface magnetic flux is very small and the product density is increased, the value of the surface magnetic flux is also very large, and the total magnetic flux is also higher than that of the conventional product.
It can be seen that the improvement is about 10 to 15%. This is because in the present invention, the shape of the granulated powder in the mold is the same as the original shape (before filling), there is no locally collapsed portion, a uniform density distribution can be realized, and sufficient orientation is achieved even with a predetermined magnetic field. Is done.
Further, as is clear from the column of filling time, the method of the present invention completes the filling in a short time as compared with the prior art without causing any problem.
以上本発明の好ましい一実施例について詳述したが本発
明はこのような構成のみに限定されるものではない。本
発明における上記のような優れた効果は主として物質の
磁気的性質に起因するものであるから、それが永久磁石
粉体と樹脂との混合物であれば磁石粉体として前記サマ
リウム−コバルト系磁石の他、フェライト系、アルニコ
系、更にはネオジウム−鉄−ボロン系等の何れであって
も、また樹脂としてはエポキシ系の他、フェノール系等
を用いた場合でも同様の結果が得られる。成形体の形状
は、リング形状のみならず他の任意の形状の場合でも適
用できる。特に本発明は金型の開口面積が非常に小さい
場合、あるいは前記実施例のように一方が極端に狭い構
造（即ち薄肉構造）の場合に有効である。最終的な成形
時に配向磁場を印加するか否かは任意であり、従って等
方性ボンド磁石の製造にも適用可能である。造粒粉の充
填時における磁場は、場所によって変化していることと
落下方向程強くなるように変化する磁場であれば、縦磁
場、横磁場、ラジアル磁場など任意のかけ方を適用で
き、従って造粒粉の落下方向に対して平行でも垂直でも
よい。The preferred embodiment of the present invention has been described in detail above, but the present invention is not limited to such a configuration. Since the excellent effects as described above in the present invention are mainly caused by the magnetic properties of the substance, if it is a mixture of permanent magnet powder and resin, the samarium-cobalt based magnet of the magnet is used as magnet powder. Similar results can be obtained when any of ferrite-based, alnico-based, neodymium-iron-boron-based, and epoxy-based resins is used as the resin. The shape of the molded body can be applied not only to the ring shape but also to any other shape. In particular, the present invention is effective when the opening area of the mold is very small or when one of the structures has an extremely narrow structure (that is, a thin structure) as in the above embodiment. Whether or not the orientation magnetic field is applied at the time of final molding is arbitrary, and is therefore applicable to the production of isotropic bonded magnets. The magnetic field at the time of filling the granulated powder can be any magnetic field such as a vertical magnetic field, a horizontal magnetic field, and a radial magnetic field as long as it is a magnetic field that changes depending on the place and changes so that it becomes stronger as it falls. It may be parallel or perpendicular to the falling direction of the granulated powder.
［発明の効果］ 本発明は上記のように永久磁石粉体と樹脂との混合物を
造粒した後、金型の深さ方向に磁場勾配を持つ交流磁場
で金型内に充填し圧縮成形する方法だから、金型内への
造粒粉の充填時間を従来技術に比べ著しく短縮でき、特
に金型開口面積が小さい場合や金型開口部が極端に狭い
ような場合でも迅速に充填でき、ボンド磁石の製造効率
を非常に高くできる点で優れた効果を有するものであ
る。[Effect of the Invention] According to the present invention, after the mixture of the permanent magnet powder and the resin is granulated as described above, the mold is filled with an alternating magnetic field having a magnetic field gradient in the depth direction of the mold and compression molding is performed. Because of this method, the time for filling the granulated powder into the mold can be significantly shortened compared to the conventional technology, and especially when the mold opening area is small or the mold opening is extremely narrow, it is possible to rapidly fill the bond. It has an excellent effect in that the manufacturing efficiency of the magnet can be made extremely high.
また本発明では造粒粉を金型内へ均一にしかも元の形状
を殆ど変えずに、また再現性よく定量充填できるため、
所定の磁場でも高い配向度が期待でき、より均一な密度
分布が実現され、均一な磁束が発生し、それらによって
より高密度で高い特性を呈するボンド磁石を製造できる
効果がある。Further, in the present invention, since the granulated powder can be uniformly filled in the mold with little change in the original shape and can be quantitatively filled with good reproducibility,
Even in a given magnetic field, a high degree of orientation can be expected, a more uniform density distribution is realized, and a uniform magnetic flux is generated, which produces a bonded magnet exhibiting higher density and higher characteristics.
第１図は本発明方法で用いるラジアル異方性リング状ボ
ンド磁石の製造用の金型並びに磁気回路の全体構造図、
第２図は第１図で一点鎖線で囲んだIIの部分での造粒粉
充填状態と磁束を示す拡大説明図である。 10……ダイス、12……上ロッド、14……上パンチ、22a,
22b,42a,42b……コイル、32……下ロッド、34……下パ
ンチ、52……造粒粉、54……飛散防止カバー。FIG. 1 is an overall structural diagram of a die and a magnetic circuit for producing a radial anisotropic ring-shaped bonded magnet used in the method of the present invention,
FIG. 2 is an enlarged explanatory view showing a state in which the granulated powder is filled and the magnetic flux in the portion II surrounded by the one-dot chain line in FIG. 10 …… Dice, 12 …… Upper rod, 14 …… Upper punch, 22a,
22b, 42a, 42b …… Coil, 32 …… Lower rod, 34 …… Lower punch, 52 …… Granulated powder, 54 …… Scatterproof cover.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 中野 廣文 東京都港区新橋５丁目36番11号 富士電気 化学株式会社内 (72)発明者 松井 一雄 東京都港区新橋５丁目36番11号 富士電気 化学株式会社内 (56)参考文献 特開 昭61−26205（ＪＰ，Ａ) 特開 昭63−153806（ＪＰ，Ａ) ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Hirofumi Nakano 5 36-11 Shimbashi, Minato-ku, Tokyo Fuji Electric Chemical Co., Ltd. (72) Kazuo Matsui 5 36-11 Shinbashi, Minato-ku, Tokyo Fuji Electrochemical Co., Ltd. (56) Reference JP-A-61-26205 (JP, A) JP-A-63-153806 (JP, A)
Claims (1)
を施し、その造粒粉を金型の深さ方向に磁場勾配を持つ
交流磁場で金型内に充填して圧縮成形することを特徴と
するボンド磁石の製造方法。1. A mixture of permanent magnet powder and resin is granulated, and the granulated powder is filled in a mold with an alternating magnetic field having a magnetic field gradient in the depth direction of the mold and compression molded. A method for manufacturing a bonded magnet, comprising:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62272095A JPH07101657B2 (en) | 1987-10-28 | 1987-10-28 | Bonded magnet manufacturing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62272095A JPH07101657B2 (en) | 1987-10-28 | 1987-10-28 | Bonded magnet manufacturing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01114009A JPH01114009A (en) | 1989-05-02 |
| JPH07101657B2 true JPH07101657B2 (en) | 1995-11-01 |
Family
ID=17509008
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62272095A Expired - Fee Related JPH07101657B2 (en) | 1987-10-28 | 1987-10-28 | Bonded magnet manufacturing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07101657B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI221619B (en) * | 2002-04-24 | 2004-10-01 | Mitsubishi Electric Corp | Apparatus for moulding permanent magnet |
Family Cites Families (2)
| 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 |
| JPS63153806A (en) * | 1986-08-29 | 1988-06-27 | Ube Nitto Kasei Kk | Manufacture of anisotropic plastic magnet |
-
1987
- 1987-10-28 JP JP62272095A patent/JPH07101657B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01114009A (en) | 1989-05-02 |
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| Date | Code | Title | Description |
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| LAPS | Cancellation because of no payment of annual fees |