JP3057897B2 - Manufacturing method of anisotropic rare earth magnet - Google Patents
Manufacturing method of anisotropic rare earth magnetInfo
- Publication number
- JP3057897B2 JP3057897B2 JP4116821A JP11682192A JP3057897B2 JP 3057897 B2 JP3057897 B2 JP 3057897B2 JP 4116821 A JP4116821 A JP 4116821A JP 11682192 A JP11682192 A JP 11682192A JP 3057897 B2 JP3057897 B2 JP 3057897B2
- Authority
- JP
- Japan
- Prior art keywords
- magnet material
- punch
- rare earth
- magnet
- extruded
- 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 - Fee Related
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/02—Making ferrous alloys by powder metallurgy
- C22C33/0257—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements
- C22C33/0278—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements with at least one alloying element having a minimum content above 5%
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/20—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces by extruding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B11/00—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses
- B30B11/02—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses using a ram exerting pressure on the material in a moulding space
- B30B11/027—Particular press methods or systems
-
- 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
- H01F1/04—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 metals or alloys
- H01F1/047—Alloys characterised by their composition
- H01F1/053—Alloys characterised by their composition containing rare earth metals
- H01F1/055—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5
- H01F1/057—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B
- H01F1/0571—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes
- H01F1/0575—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes pressed, sintered or bonded together
- H01F1/0576—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes pressed, sintered or bonded together pressed, e.g. hot working
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/0253—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing permanent magnets
- H01F41/0273—Imparting anisotropy
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Crystallography & Structural Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing Cores, Coils, And Magnets (AREA)
Description
【０００１】[0001]
【産業上の利用分野】この発明は異方性希土類磁石の製
造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing an anisotropic rare earth magnet.
【０００２】[0002]
【従来の技術】Ｒ−Ｆｅ−Ｂ（ＲはＬａ系の希土類元
素）で代表される希土類磁石には、（イ）母材合金を溶
融し、型に鋳込んで鋳塊とし、これを粉砕して極微細粉
とし、この粉末を磁場中で成形・焼結して異方性磁石と
した焼結磁石と、（ロ）母材合金の溶湯を超急冷して薄
帯とし、その粗粉砕粉末を圧粉して成る等方磁性の素材
を塑性変形加工して磁気異方化した超急冷磁石とがあ
る。2. Description of the Related Art Rare-earth magnets represented by R-Fe-B (R is a La-based rare earth element) include (a) a base material alloy which is melted and cast into a mold to form an ingot, which is pulverized. Into an ultrafine powder, and form and sinter this powder in a magnetic field to form an anisotropic magnet; There is a super-quenched magnet that is magnetically anisotropic by plastically deforming an isotropic magnetic material formed by compacting powder.
【０００３】これらの異方性希土類磁石は高い磁気特性
を有しており、ＯＡ用，ＦＡ用の小型モータに適用でき
ればモータの小型化，軽量化を図る上で極めて有用であ
る。[0003] These anisotropic rare earth magnets have high magnetic properties, and if they can be applied to small motors for OA and FA, they are extremely useful in reducing the size and weight of the motor.
【０００４】この希土類磁石をモータに適用するには、
これを半径方向に磁気異方化したリング状磁石とするこ
とが最も望ましいが、上記焼結磁石の場合、粉末を磁場
中で成形・焼結する際に半径方向の磁場を付与するのが
難しい問題がある。To apply this rare earth magnet to a motor,
It is most preferable that this is a ring-shaped magnet with magnetic anisotropy in the radial direction, but in the case of the sintered magnet, it is difficult to apply a magnetic field in the radial direction when molding and sintering the powder in a magnetic field. There's a problem.
【０００５】一方後者の超急冷磁石の場合、磁場中での
成形を必要とせず、塑性変形によって異方化を行うた
め、上記リング状磁石にあっても異方化を最大限に行い
得る特長がある。[0005] On the other hand, the latter super-quenched magnet does not require molding in a magnetic field and performs anisotropic deformation by plastic deformation. There is.
【０００６】ここで塑性変形によって異方化を行う方法
として、従来、中空又は中実円板状の等方性磁石素材を
押出成形する方法が用いられている。Here, as a method of performing anisotropic deformation by plastic deformation, a method of extruding a hollow or solid disk-shaped isotropic magnet material has conventionally been used.
【０００７】図４はその一例を示している。図において
１００は厚肉円筒形状の筒型，１０２はその底部を構成
する底型で、これら筒型１００，底型１０２によりダイ
スが構成されている。FIG. 4 shows an example. In the figure, reference numeral 100 denotes a thick cylindrical tube, and reference numeral 102 denotes a bottom forming the bottom thereof. The cylindrical die 100 and the bottom 102 constitute a die.
【０００８】１０４はポンチで、１０６はポンチ１０４
と筒型１００との間の成形空間（成形部）１０８内に後
退可能に収容された円筒部材である。Reference numeral 104 denotes a punch, and reference numeral 106 denotes a punch.
It is a cylindrical member that is retractably accommodated in a molding space (molding portion) 108 between the cylindrical member 100 and the cylindrical mold 100.
【０００９】尚底型１０２には、ポンチ１０４の中心突
部１１０を突入させる嵌合穴１１２が設けられている。The bottom mold 102 is provided with a fitting hole 112 into which the central projection 110 of the punch 104 is inserted.
【００１０】この方法は、中空円板状の磁石素材１１４
を成形型内に装填し、そして磁石素材１１４の成形部１
０８に臨む自由端面を円筒部材１０６で押圧しつつ且つ
これを後退させつつ、ポンチ１０４を磁石素材１１４に
押し込んで後方押出成形するもので、これにより磁石素
材１１４は円筒形状に成形されると同時にラジアル方向
（半径方向）に磁気異方化される。In this method, a hollow disk-shaped magnet material 114 is used.
Is loaded into the mold, and the molding part 1 of the magnet material 114 is
08, while pressing the free end face with the cylindrical member 106 and retreating the same, the punch 104 is pushed into the magnet material 114 and extruded backward, whereby the magnet material 114 is formed into a cylindrical shape. It is magnetically anisotropic in the radial direction (radial direction).
【００１１】[0011]
【発明が解決しようとする課題】ところでこの押出成形
方法の場合、図（Ｂ）中イで示す円筒成形体の上端部分
の磁気特性が他の部分、例えば図中ロで示す部分に比べ
て低く、同部分については実際の使用に供し得ない問題
があった。However, in the case of this extrusion molding method, the magnetic properties of the upper end portion of the cylindrical molded body shown in FIG. 2B are lower than those of other portions, for example, the portion shown in FIG. However, there was a problem that this portion could not be used for actual use.
【００１２】図中イで示す部分の磁気特性が低いのは、
同部分は押出成形の開始当初に成形部１０８内に押し出
される部分であって、ラジアル方向に十分な圧縮歪を加
えられないまま成形部１０８内に押し出されてしまい、
その加工率が他の部分に比べて低いことがその理由であ
ると考えられる。The magnetic characteristics of the portion indicated by a in FIG.
The same part is a part that is extruded into the molding part 108 at the beginning of the extrusion molding, and is extruded into the molding part 108 without applying sufficient compressive strain in the radial direction,
It is considered that the reason is that the processing rate is lower than other parts.
【００１３】[0013]
【課題を解決するための手段】本発明はこのような課題
を解決するためになされたものであり、その要旨は、成
形型内に希土類磁石素材を装填し、該磁石素材に対しポ
ンチを押圧して該磁石素材を塑性変形させつつ成形部内
に押し出して磁気異方性の成形体に押出成形するに際
し、該磁石素材の前記ポンチの先端面に接触する部分を
部分的に突出させて該磁石素材の形状を、該ポンチの先
端面に接触する部分と前記成形部に臨む部分とが段違状
を成す形状と成したことにある。SUMMARY OF THE INVENTION The present invention has been made to solve such problems, and the gist of the present invention is to load a rare earth magnet material into a mold and press a punch against the magnet material. When the magnet material is extruded into a molded part while being plastically deformed and extruded into a magnetically anisotropic molded body, a portion of the magnet material that is in contact with the leading end surface of the punch is partially projected to form the magnet material. The material has a shape in which a portion that contacts the tip end surface of the punch and a portion that faces the forming portion form a step.
【００１４】[0014]
【作用及び発明の効果】以上のように本発明は、磁石素
材の形状を、ポンチの先端面に接触する部分と成形部に
臨む部分とが段違状となるような形状と成してこれを押
出成形するもので、かかる本発明によれば、押出成形の
開始当初に成形部内に押し出される部分に対しても十分
な圧縮歪を加えつつ塑性変形させることができる。As described above, according to the present invention, the shape of the magnet material is formed such that the portion contacting the tip end surface of the punch and the portion facing the forming portion are stepped. According to the present invention, it is possible to plastically deform a portion extruded into a molded portion at the beginning of extrusion molding while applying a sufficient compressive strain.
【００１５】従って例えば磁石素材を円筒形状に押出成
形した場合において、円筒成形体の端部における磁気特
性を十分に高めることができ、同部分をも使用に供する
ことが可能となって、高価な希土類磁石の歩留を向上さ
せることができる。Therefore, for example, when the magnet material is extruded into a cylindrical shape, the magnetic characteristics at the end of the cylindrical molded body can be sufficiently enhanced, and the same portion can be used, which is expensive. The yield of rare earth magnets can be improved.
【００１６】[0016]
【実施例】次に本発明の実施例を図面に基づいて詳しく
説明する。図１は希土類磁石素材を後方押出成形する場
合の例を示したもので、図中１０は筒型、１２は可動の
底型でこれら筒型１０と底型１２とでダイス１３が構成
されている。１４はポンチであり、また１６は筒型１０
とポンチ１４との間の成形空間（成形部）１８内に収容
され、磁石素材の押出しにつれて後退運動させられる円
筒部材である。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows an example in which a rare earth magnet material is extruded backward. In the drawing, reference numeral 10 denotes a cylindrical mold, 12 denotes a movable bottom mold, and a die 13 is formed by the cylindrical mold 10 and the bottom mold 12. I have. 14 is a punch and 16 is a cylindrical 10
It is a cylindrical member that is accommodated in a molding space (molding portion) 18 between the and the punch 14, and is moved backward as the magnet material is extruded.
【００１７】尚、ポンチ１４には図中下向きに中心突部
２２が、また底型１２にはこれに対応する嵌合穴２４が
設けられている。The punch 14 is provided with a central projection 22 downward in the figure, and the bottom die 12 is provided with a corresponding fitting hole 24.
【００１８】本例の方法では、先ず成形型内に磁石素材
２０を装填し、かかる磁石素材２０を成形型とともに所
定温度に加熱した状態とする。またこれら成形型及び磁
石素材２０は、全体を密閉槽内に保持し、その槽内雰囲
気を１トールより低い圧力の真空とするか又はアルゴン
ガス等の不活性ガスを充満させて酸化防止雰囲気とした
状態で押出成形を行う。In the method of the present embodiment, first, the magnet material 20 is loaded into a mold, and the magnet material 20 is heated to a predetermined temperature together with the mold. Further, the molding die and the magnet material 20 are entirely held in a sealed tank, and the atmosphere in the tank is set to a vacuum having a pressure lower than 1 Torr or filled with an inert gas such as an argon gas to form an atmosphere for preventing oxidation. Extrusion molding is performed in the state.
【００１９】磁石素材２０は全体として略中空円板形状
を成すものであるが、内周側の部分２６が外周側の部分
２８に対して軸方向に突出した形状とされている。The magnet material 20 has a substantially hollow disk shape as a whole, but has a shape in which an inner peripheral portion 26 projects axially from an outer peripheral portion 28.
【００２０】即ち可動ポンチ１４の先端押圧面に接触す
る部分と上記成形部１８に臨む部分とが段違形状とされ
ている。That is, the portion that comes into contact with the front end pressing surface of the movable punch 14 and the portion that faces the forming portion 18 have a stepped shape.
【００２１】さて磁石素材２０を成形型内に装填した
ら、次に（Ｂ）に示しているようにダイス１３内にポン
チ１４と円筒部材１６とを挿入し、ポンチ１４及び円筒
部材１６の各先端面を磁石素材２０の内周側部分２６と
外周側部分２８の各端面に当接させる。After the magnet material 20 is loaded in the mold, the punch 14 and the cylindrical member 16 are inserted into the die 13 as shown in FIG. The surface is brought into contact with each end face of the inner peripheral portion 26 and the outer peripheral portion 28 of the magnet material 20.
【００２２】そしてこの状態で（Ｃ）に示しているよう
にポンチ１４を図中下向きに押し込んで、磁石素材２０
を塑性変形させつつ後方押出しする。In this state, the punch 14 is pushed downward in the figure as shown in FIG.
Is extruded backward while being plastically deformed.
【００２３】このとき円筒部材１６は、成形部１８内に
押し出される磁石素材２０の自由端面を図中下向きに押
圧しつつ、磁石素材２０の押出しにつれて後退運動す
る。At this time, the cylindrical member 16 retreats as the magnet material 20 is extruded while pressing the free end face of the magnet material 20 pushed into the forming portion 18 downward in the drawing.
【００２４】このように円筒部材１６によって磁石素材
２０の自由端面を押圧しつつ押出成形をすることで、成
形体２５に成形割れが生じるのを効果的に防止すること
ができる。By performing extrusion while pressing the free end face of the magnet material 20 with the cylindrical member 16 as described above, it is possible to effectively prevent the molded body 25 from being cracked.
【００２５】（Ｃ）において押出成形された磁石素材の
成形体２５は、その後底型１２の筒型１０に対する相対
移動により成形型から取り出された上、常法に従って着
磁処理され、ラジアル異方性の希土類磁石となる。The molded body 25 of the magnet material extruded in (C) is then taken out of the mold by the relative movement of the bottom mold 12 with respect to the cylindrical mold 10 and then subjected to a magnetizing treatment according to a conventional method to obtain a radially anisotropic material. Rare earth magnet.
【００２６】本例の方法にて磁石素材２０を後方押出成
形した場合、円筒成形体２５の上端部、つまり押出成形
開始当初に成形部１８内に入り込んだ部分に対しても半
径方向の圧縮歪を十分に加えることができ、従って同部
分に対して良好な磁気特性を付与することができる。In the case where the magnet material 20 is extruded backward by the method of this embodiment, the upper end portion of the cylindrical molded body 25, that is, the portion which has entered the molded portion 18 at the beginning of the extrusion molding, also has a radial compression strain. Can be sufficiently added, and good magnetic properties can be imparted to the same portion.
【００２７】因みに磁石材料粉末として２８Ｎｄ−２．
５Ｄｙ−０．９Ｂ−５Ｃｏ−残Ｆｅ（数値は何れも重量
％）から成る合金粉末を用い、これを８００℃，Ａｒガ
ス中で圧粉処理して図２に示す寸法形状の磁石素材２０
を作製し、次いでこれを図１に示す方法で後方押出成形
及び着磁処理して円筒形状の希土類磁石を製造し、特性
調査したところ、円筒成形体２５の上端部においても良
好な磁気特性が得られた。Incidentally, 28Nd-2.
An alloy powder composed of 5Dy-0.9B-5Co-remaining Fe (each numerical value is wt%) is compacted in an Ar gas at 800 ° C., and is subjected to a compacting process.
Then, this was rear-extruded and magnetized by the method shown in FIG. 1 to produce a cylindrical rare earth magnet, and its characteristics were examined. As a result, good magnetic properties were obtained even at the upper end of the cylindrical molded body 25. Obtained.
【００２８】その結果が表１に示してある。但し表１の
数値は、円筒成形体２５の端から５ｍｍまでの部分のラ
ジアル方向の磁気特性を示している。The results are shown in Table 1. However, the numerical values in Table 1 indicate the magnetic properties in the radial direction of a portion from the end of the cylindrical molded body 25 to 5 mm.
【００２９】[0029]
【表１】 [Table 1]
【００３０】この結果より、磁石素材２０の形状を内周
側部分２６が突出した形状とした上で後方押出成形する
ことで、押出成形開始当初に成形部１８内に入り込んだ
部分に対しても良好な磁気特性を付与できること、また
その突出量（突出し高さ）Ｌ寸法を４ｍｍ以上としたと
き、その効果が高いこと等が分る。According to the results, the magnet material 20 is formed into a shape in which the inner peripheral side portion 26 protrudes, and is subjected to backward extrusion molding, so that the portion which has entered the molding portion 18 at the beginning of the extrusion molding can be formed. It can be seen that good magnetic properties can be provided, and that the effect is high when the protrusion amount (projection height) L is set to 4 mm or more.
【００３１】以上本発明の実施例を詳述したがこれはあ
くまで一例示である。例えば本発明における磁石素材と
して図３に示すような中実形態の磁石素材３０を用いる
ことも可能であるし、また磁石素材を前方押出成形によ
り所定形状に成形するに際しても本発明の適用が可能で
ある等、本発明はその主旨を逸脱しない範囲において、
当業者の知識に基づき様々な変更を加えた態様で実施可
能である。Although the embodiment of the present invention has been described in detail, this is merely an example. For example, a solid magnet material 30 as shown in FIG. 3 can be used as the magnet material in the present invention, and the present invention can also be applied when the magnet material is formed into a predetermined shape by forward extrusion. The present invention, within the scope not departing from the gist,
The present invention can be implemented in various modified embodiments based on the knowledge of those skilled in the art.
【図１】本発明の一実施例方法の工程説明図である。FIG. 1 is a process explanatory view of a method according to an embodiment of the present invention.
【図２】同実施例に用いた磁石素材の形状を示す図であ
る。FIG. 2 is a view showing a shape of a magnet material used in the embodiment.
【図３】本発明の他の実施例において使用される磁石素
材の形状を示す図である。FIG. 3 is a view showing a shape of a magnet material used in another embodiment of the present invention.
【図４】本発明の背景説明のための説明図である。FIG. 4 is an explanatory diagram for explaining the background of the present invention.
１３ ダイス １４ ポンチ １８ 成形部 ２０，３０ 磁石素材 ２６ 内周側部分 ２８ 外周側部分 DESCRIPTION OF SYMBOLS 13 Dice 14 Punch 18 Molding part 20, 30 Magnet material 26 Inner peripheral part 28 Outer peripheral part
フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) H01F 7/02 H01F 41/02 Continuation of the front page (58) Field surveyed (Int.Cl. 7 , DB name) H01F 7/02 H01F 41/02
Claims (1)
磁石素材に対しポンチを押圧して該磁石素材を塑性変形
させつつ成形部内に押し出して磁気異方性の成形体に押
出成形するに際し、 該磁石素材の前記ポンチの先端面に接触する部分を部分
的に突出させて該磁石素材の形状を、該ポンチの先端面
に接触する部分と前記成形部に臨む部分とが段違状を成
す形状と成したことを特徴とする異方性希土類磁石の製
造方法。1. A rare earth magnet material is loaded into a molding die, and a punch is pressed against the magnet material to cause the magnet material to be plastically deformed and extruded into a molding portion to be extruded into a magnetically anisotropic molded body. At this time, a portion of the magnet material that is in contact with the tip surface of the punch is partially protruded so that the shape of the magnet material is stepped between a portion that contacts the tip surface of the punch and a portion that faces the forming portion. A method for producing an anisotropic rare earth magnet, characterized in that the magnet has a shape of:
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4116821A JP3057897B2 (en) | 1992-04-09 | 1992-04-09 | Manufacturing method of anisotropic rare earth magnet |
| EP19930302736 EP0565363B1 (en) | 1992-04-09 | 1993-04-07 | Method for producing anisotropic rare earth magnet |
| DE1993603313 DE69303313T2 (en) | 1992-04-09 | 1993-04-07 | Manufacturing process for an anisotropic rare earth magnet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4116821A JP3057897B2 (en) | 1992-04-09 | 1992-04-09 | Manufacturing method of anisotropic rare earth magnet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05291024A JPH05291024A (en) | 1993-11-05 |
| JP3057897B2 true JP3057897B2 (en) | 2000-07-04 |
Family
ID=14696466
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4116821A Expired - Fee Related JP3057897B2 (en) | 1992-04-09 | 1992-04-09 | Manufacturing method of anisotropic rare earth magnet |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0565363B1 (en) |
| JP (1) | JP3057897B2 (en) |
| DE (1) | DE69303313T2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101979881B (en) * | 2010-11-25 | 2013-02-06 | 湖南湘电长沙水泵有限公司 | Detection method for controlling streamline size of impeller blade |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6454993B1 (en) | 2000-01-11 | 2002-09-24 | Delphi Technologies, Inc. | Manufacturing technique for multi-layered structure with magnet using an extrusion process |
| JP2013098485A (en) * | 2011-11-04 | 2013-05-20 | Toyota Motor Corp | Manufacturing apparatus and manufacturing method for rare earth magnet |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4859410A (en) * | 1988-03-24 | 1989-08-22 | General Motors Corporation | Die-upset manufacture to produce high volume fractions of RE-Fe-B type magnetically aligned material |
| EP0392799B2 (en) * | 1989-04-14 | 1998-11-25 | Daido Tokushuko Kabushiki Kaisha | Method and apparatus for producing anisotropic rare earth magnet |
-
1992
- 1992-04-09 JP JP4116821A patent/JP3057897B2/en not_active Expired - Fee Related
-
1993
- 1993-04-07 DE DE1993603313 patent/DE69303313T2/en not_active Expired - Fee Related
- 1993-04-07 EP EP19930302736 patent/EP0565363B1/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101979881B (en) * | 2010-11-25 | 2013-02-06 | 湖南湘电长沙水泵有限公司 | Detection method for controlling streamline size of impeller blade |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0565363A1 (en) | 1993-10-13 |
| EP0565363B1 (en) | 1996-06-26 |
| DE69303313T2 (en) | 1996-12-05 |
| DE69303313D1 (en) | 1996-08-01 |
| JPH05291024A (en) | 1993-11-05 |
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