EP0318131B1 - Procédé et dispositif de fabrication d'aimants permanents extrudés - Google Patents

Procédé et dispositif de fabrication d'aimants permanents extrudés Download PDF

Info

Publication number
EP0318131B1
EP0318131B1 EP88304916A EP88304916A EP0318131B1 EP 0318131 B1 EP0318131 B1 EP 0318131B1 EP 88304916 A EP88304916 A EP 88304916A EP 88304916 A EP88304916 A EP 88304916A EP 0318131 B1 EP0318131 B1 EP 0318131B1
Authority
EP
European Patent Office
Prior art keywords
core
charge
container
permanent magnet
assembly
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
Application number
EP88304916A
Other languages
German (de)
English (en)
Other versions
EP0318131A1 (fr
Inventor
Vijay K. Chandhok
Robert F. Krause
Bao-Min Ma
John J. Duplessis
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Crucible Materials Corp
Original Assignee
Crucible Materials Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Crucible Materials Corp filed Critical Crucible Materials Corp
Priority to AT88304916T priority Critical patent/ATE87764T1/de
Publication of EP0318131A1 publication Critical patent/EP0318131A1/fr
Application granted granted Critical
Publication of EP0318131B1 publication Critical patent/EP0318131B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • H01F1/04—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
    • H01F1/06—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 in the form of particles, e.g. powder
    • H01F1/08—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 in the form of particles, e.g. powder pressed, sintered, or bound together
    • H01F1/083—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 in the form of particles, e.g. powder pressed, sintered, or bound together in a bonding agent
    • 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
    • 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
    • H01F41/0266—Moulding; Pressing

Definitions

  • Cylindrical, extruded magnets as shown in Fig. 2, are conventionally produced by the use of a cylindrical extrusion container. Magnet alloy particles are introduced to the container, and the container is outgassed, evacuated and sealed. Thereafter, the container is heated to extrusion temperature and extruded to consolidate the particles to substantially full density.
  • the hollow centre of the magnet is achieved by the use of a solid cylinder or mandrel of a diameter corresponding to the internal diameter of the magnet to be produced, which cylinder is attached to the extrusion ram. This solid cylinder moves with the extrusion ram during the extrusion operation and thereby maintains the desired inner diameter of the extruded magnet.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing Cores, Coils, And Magnets (AREA)
  • Powder Metallurgy (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Claims (16)

  1. Procédé pour produire un aimant permanent compacté à densité totale (6), ce procédé comprenant les stades suivants :
    procurer une charge de particules (P) ;
    placer cette charge dans un récipient cylindrique ; et
    chauffer ce récipient (8) et la charge à une température élevée et extruder le récipient (8) et la charge pour compacter cette charge, caractérisé en ce que la charge de particules (P) est d'une composition d'alliage magnétique permanent dont l'aimant (6) doit être fait, en ce que le récipient (8) comporte un noyau (12) positionné sensiblement axialement, la charge entourant le noyau (12) à l'intérieur du récipient (8), et en ce que le récipient (8) et la charge sont chauffés et extrudés pour former un aimant permanent pratiquement totalement dense (6) ayant des propriétés magnétiques pratiquement identiques selon deux directions orthogonales perpendiculaires à la direction d'extrusion pour obtenir une texture de fibres [100].
  2. Procédé selon la revendication 1, dans lequel le noyau (12) est retiré après compactage.
  3. Procédé selon la revendication 1 ou la revendication 2, dans lequel un agent de séparation est appliqué sur le noyau (12).
  4. Procédé selon l'une des revendications 1 à 3, dans lequel le noyau (12) est en acier au carbone.
  5. procédé selon l'une des revendications 1 à 3, dans lequel le noyau (12) est en un matériau magnétique doux.
  6. Procédé selon l'une des revendications 1 à 3, dans lequel le noyau (12) est en acier inoxydable.
  7. Procédé selon la revendication 1 ou l'une quelconque des revendications 3 à 6, dans lequel le noyau (12) est lié à l'alliage magnétique permanent pendant l'extrusion.
  8. Procédé selon l'une quelconque des revendications précédentes, dans lequel l'extrusion est effectuée avec un taux d'extrusion compris entre 1,5:1 et 50:1.
  9. Procédé selon l'une quelconque des revendications précédentes, dans lequel l'extrusion est effectuée avec la charge à une température comprise entre 500 et 1200°C.
  10. Procédé selon l'une quelconque des revendications précédentes, dans lequel la charge de particules d'alliage magnétique permanent comprend au moins un élément de terre rare.
  11. Dispositif adapté pour être utilisé pour produire par extrusion un aimant permanent compacté totalement dense (6), ce dispositif comprenant un récipient cylindrique (8) et une charge de particules (P), caractérisé en ce qu'un noyau massif (12) est positionné sensiblement axialement à l'intérieur du récipient (8) et définit avec celui-ci une chambre annulaire (14), et en ce que la charge de particules (P) est en un alliage magnétique permanent dont l'aimant (6) doit être fait et est prévue à l'intérieur de cette chambre annulaire (14).
  12. Dispositif selon la revendication 1,, dans lequel un agent de séparation est appliqué sur le noyau (12).
  13. Dispositif selon la revendication 11 ou la revendication 12, dans lequel le noyau (12) est en acier au carbone.
  14. Dispositif selon la revendication 11 ou la revendication 12, dans lequel le noyau (12) est en un matériau magnétique doux.
  15. Dispositif selon la revendication 12, dans lequel le noyau (12) est en acier inoxydable.
  16. Dispositif selon l'une quelconque des revendications 11 à 15, dans lequel la charge de particules d'un alliage magnétique permanent comprend au moins un élément de terre rare.
EP88304916A 1987-11-18 1988-05-31 Procédé et dispositif de fabrication d'aimants permanents extrudés Expired - Lifetime EP0318131B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88304916T ATE87764T1 (de) 1987-11-18 1988-05-31 Verfahren und vorrichtung zur herstellung von stranggepressten koerpern aus dauermagnetischem material.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US12235187A 1987-11-18 1987-11-18
US122351 1998-07-24

Publications (2)

Publication Number Publication Date
EP0318131A1 EP0318131A1 (fr) 1989-05-31
EP0318131B1 true EP0318131B1 (fr) 1993-03-31

Family

ID=22402192

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88304916A Expired - Lifetime EP0318131B1 (fr) 1987-11-18 1988-05-31 Procédé et dispositif de fabrication d'aimants permanents extrudés

Country Status (6)

Country Link
EP (1) EP0318131B1 (fr)
JP (1) JPH01151216A (fr)
AT (1) ATE87764T1 (fr)
CA (1) CA1301602C (fr)
DE (1) DE3879886T2 (fr)
ES (1) ES2040341T3 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10312102B4 (de) * 2003-03-19 2015-10-08 Robert Bosch Gmbh Vorrichtung zur Messung eines Füllstandes einer Flüssigkeit in einem Behälter

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3447230A (en) * 1967-01-05 1969-06-03 Sylvania Electric Prod Art of making seamless hollow bodies from sinterable powders
US3918867A (en) * 1969-06-28 1975-11-11 Philips Corp Device for extruding permanent magnet bodies
JPS5120592A (ja) * 1974-08-13 1976-02-18 Matsushita Electric Ind Co Ltd Kyojiseitaifunmatsuno jikaichuseikeiyokanagata
JPS5176108A (ja) * 1974-12-27 1976-07-01 Hitachi Metals Ltd Funmatsuyakinhonyorukanseizoho oyobifunmatsujutenyoki
GB1534221A (en) * 1977-07-25 1978-11-29 Ipari Szerelveny & Gepgyar Process for the production of sleeves and like workpieces from hard metals of high cobalt content
US4579607A (en) * 1982-04-19 1986-04-01 Matsushita Electric Industrial Company, Limited Permanent Mn-Al-C alloy magnets and method for making same
JPS60214515A (ja) * 1984-04-10 1985-10-26 Seiko Epson Corp 円筒状永久磁石の製造方法
JPH0626169B2 (ja) * 1984-12-27 1994-04-06 ティーディーケイ株式会社 希土類磁石の磁場中成型方法及び装置
US4602952A (en) * 1985-04-23 1986-07-29 Cameron Iron Works, Inc. Process for making a composite powder metallurgical billet
US4640815A (en) * 1985-10-17 1987-02-03 Crucible Materials Corporation Method and assembly for producing extrusion-clad tubular product
CA1269029A (fr) * 1986-01-29 1990-05-15 Peter Vernia Fabrication d'un aimant permanent en alliage de metal de transition de terre rare et de bore
JPH0624176B2 (ja) * 1986-03-29 1994-03-30 信越化学工業株式会社 極異方性長尺成形品の製造方法

Also Published As

Publication number Publication date
EP0318131A1 (fr) 1989-05-31
ATE87764T1 (de) 1993-04-15
DE3879886D1 (de) 1993-05-06
JPH01151216A (ja) 1989-06-14
CA1301602C (fr) 1992-05-26
DE3879886T2 (de) 1993-08-26
ES2040341T3 (es) 1993-10-16

Similar Documents

Publication Publication Date Title
EP0418304B1 (fr) Procede de construction d'un rotor a aimant permanent
EP1895551B1 (fr) Procede de production d'un aimant radialement anisotrope
US4151435A (en) Stator structure using forming curved wafer thin magnets from rare earth-cobalt alloy powders
DE19728418C2 (de) Herstellungsverfahren für anisotrope harzgebundene Magneten
US5223759A (en) DC brushless motor with solid rotor having permanent magnet
JP5963870B2 (ja) 永久磁石の製造方法、および永久磁石の製造装置
EP1713098B1 (fr) Aimant fritté cylindrique anisotrope radial et moteur à aimant permanent
US20070151629A1 (en) Methods of producing radial anisotropic cylinder sintered magnet and permanent magnet motor-use cyclinder multi-pole magnet
US4325757A (en) Method of forming thin curved rare earth-transition metal magnets from lightly compacted powder preforms
US3977918A (en) Method of making magnets
US4990306A (en) Method of producing polar anisotropic rare earth magnet
EP0261292A2 (fr) Procédé de fabrication d'aimant permanent en alliage de haute densité
US4628809A (en) Radial orientation rare earth-cobalt magnet rings
US4533407A (en) Radial orientation rare earth-cobalt magnet rings
EP0318131B1 (fr) Procédé et dispositif de fabrication d'aimants permanents extrudés
US5047205A (en) Method and assembly for producing extruded permanent magnet articles
US4985085A (en) Method of making anisotropic magnets
US4144060A (en) Method of fabricating rare earth-transition metal magnets
EP0565363B1 (fr) Méthode de production d'un aimant de terre rare anisotrope
US4915891A (en) Method for producing a noncircular permanent magnet
JPH01248503A (ja) Ｒ−Ｆｅ−Ｂ系異方性磁石の製造方法
US5342574A (en) Method for producing anisotropic rare earth magnet
RU2051456C1 (ru) Способ изготовления магнитопроводов электрических машин и аппаратов
KR20070023644A (ko) 레이디얼 이방성 원통 소결 자석 및 영구 자석 모터용 원통다극 자석의 제조 방법
JPS61261448A (ja) 高エネルギ−積永久磁石の製造方法

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH DE ES FR GB GR IT LI LU NL SE

17P Request for examination filed

Effective date: 19890601

17Q First examination report despatched

Effective date: 19920227

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE CH DE ES FR GB GR IT LI LU NL SE

REF Corresponds to:

Ref document number: 87764

Country of ref document: AT

Date of ref document: 19930415

Kind code of ref document: T

ITF It: translation for a ep patent filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19930409

Year of fee payment: 6

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19930414

Year of fee payment: 6

Ref country code: CH

Payment date: 19930414

Year of fee payment: 6

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 19930415

Year of fee payment: 6

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: AT

Payment date: 19930419

Year of fee payment: 6

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: BE

Payment date: 19930422

Year of fee payment: 6

ET Fr: translation filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: LU

Payment date: 19930428

Year of fee payment: 6

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GR

Payment date: 19930430

Year of fee payment: 6

Ref country code: GB

Payment date: 19930430

Year of fee payment: 6

REF Corresponds to:

Ref document number: 3879886

Country of ref document: DE

Date of ref document: 19930506

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: ES

Payment date: 19930517

Year of fee payment: 6

ITTA It: last paid annual fee
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 19930531

Year of fee payment: 6

REG Reference to a national code

Ref country code: GR

Ref legal event code: FG4A

Free format text: 3007879

EPTA Lu: last paid annual fee
REG Reference to a national code

Ref country code: ES

Ref legal event code: FG2A

Ref document number: 2040341

Country of ref document: ES

Kind code of ref document: T3

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19940531

Ref country code: LI

Effective date: 19940531

Ref country code: GB

Effective date: 19940531

Ref country code: CH

Effective date: 19940531

Ref country code: BE

Effective date: 19940531

Ref country code: AT

Effective date: 19940531

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Effective date: 19940601

Ref country code: ES

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19940601

BERE Be: lapsed

Owner name: CRUCIBLE MATERIALS CORP.

Effective date: 19940531

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GR

Free format text: THE PATENT HAS BEEN ANNULLED BY A DECISION OF A NATIONAL AUTHORITY

Effective date: 19941130

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Effective date: 19941201

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee
GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19940531

EUG Se: european patent has lapsed

Ref document number: 88304916.5

Effective date: 19950110

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Effective date: 19950131

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19950201

EUG Se: european patent has lapsed

Ref document number: 88304916.5

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

REG Reference to a national code

Ref country code: GR

Ref legal event code: MM2A

Free format text: 3007879

REG Reference to a national code

Ref country code: ES

Ref legal event code: FD2A

Effective date: 19990301

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.

Effective date: 20050531