EP0565363A1 - Méthode de production d'un aimant de terre rare anisotrope - Google Patents

Méthode de production d'un aimant de terre rare anisotrope Download PDF

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Publication number
EP0565363A1
EP0565363A1 EP93302736A EP93302736A EP0565363A1 EP 0565363 A1 EP0565363 A1 EP 0565363A1 EP 93302736 A EP93302736 A EP 93302736A EP 93302736 A EP93302736 A EP 93302736A EP 0565363 A1 EP0565363 A1 EP 0565363A1
Authority
EP
European Patent Office
Prior art keywords
compacted material
rare earth
punch
earth magnet
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.)
Granted
Application number
EP93302736A
Other languages
German (de)
English (en)
Other versions
EP0565363B1 (fr
Inventor
Yasuaki No. 401 Glorious Narumi Kasai
Norio No. 303 Yoshizawa Bldg. Yoshikawa
Hiyoshi Yamada
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.)
Daido Steel Co Ltd
Original Assignee
Daido Steel Co Ltd
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Filing date
Publication date
Application filed by Daido Steel Co Ltd filed Critical Daido Steel Co Ltd
Publication of EP0565363A1 publication Critical patent/EP0565363A1/fr
Application granted granted Critical
Publication of EP0565363B1 publication Critical patent/EP0565363B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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

Definitions

  • This invention relates to a method for producing an anisotropic rare earth magnet, and in particular to a method for extruding a compacted material in order to obtain a betteryield of the anisotropic rare earth magnet excellent in magnetic properties.
  • Rare earth magnets represented by R-Fe-B (R is shown on behalf rare earth metals of lanthanum series) are provided in two types as mentioned hereunder:
  • the anisotropic rare earth magnets obtained through the aforementioned processes have excellent magnetic properties, therefore it is very usefull to apply these magnets to small-sized electric motors used for various automatizing apparatuses in order to make the motors lighter and smaller.
  • numeral 100 is a cylindrical die formed in a thick-walled cylindrical shape
  • numeral 102 is a bottom die forming a bottom part of a mold.
  • Numeral 104 is a core punch and numeral 106 is a sleeve punch disposed movably in a molding cavity 108 formed between the core punch 104 and the cylindrical die 100.
  • the mold is constructed from the cylindrical die 100, the bottom die 102, the core punch 104 and the sleeve punch 106.
  • the bottom die 102 is provided with a hollow part 112 to receive a slender part 110 of the core punch 104.
  • a hollow circular plate-like (ring) shaped compacted material 114 is charged into the cylindrical die 100 of the mold, subsequently the compacted material 114 is extruded backwardly by pressing the core punch 104 into the compacted material 114 at the same time of compressing a free surface of the compacted material 114 fronting on the molding cavity 108 with the sleeve punch 106 moving back according as the progress of the extruding, thereby making the compacted material 114 anisotropic in the radial direction at the same time of forming the compacted material 114 into a hollow cylindrical magnet material.
  • This invention is made in order to solve the aforementioned problem of the prior art, and the construction of the method for producing an anisotropic rare earth magnet is characterized by comprising charging a compacted material of a rare earth magnet into cylindrical die of a mold, pressing the compacted material with a punch and plastically deforming the compacted material into a magnet material having magnetic anisotropy and a ring-shaped section by extruding the compacted material into a molding cavity formed between the punch and the cylindrical die of the mold, and the compacted material being made its center part to be in contact with an end face of the punch higher than its outer peripheral part to be faced with the molding cavity so as to form difference in level between the center and outer peripheral parts thereof.
  • the reason why the upper end portion A of the cylindrical magnet material is not so good in the magnetic properties is supposed that the portion A, being a part extruded into the molding cavity 108 at the beginning of the extruding, is extruded in the molding cavity 108 without plastic-deforming sufficiently in the radial direction, so that the degree of deformation at the portion A is low as compared with the other portion of the cylindrical magnet material.
  • the compacted material of the rare earth magnet is formed in the shape having difference in level between the center part to be in contact with the end face of the punch and the outer peripheral part to be faced with the molding cavity formed between the punch and the cylindrical die of the mold, and extruded. Therefore, it is possible to deform plastically even the portion extruded in the molding cavity at the beginning of the extruding sufficiently.
  • the compacted material is extruded into the hollow cylindrical shaped magnet material, it is possible to improve the magnetic properties at the end portion of the cylindrical magnet material, and it is possible to increase yield rate of the expensive rare earth magnet since the end portion also can be used similarly to the other portion of the cylindrical magnet material.
  • Figure 1 shows an example of a case where the compacted material of the rare earth magnet is extruded backwardly
  • numeral 10 in the drawing denotes a cylindrical die and numeral 12 denotes a bottom die disposed detachably in the bottom part of the cylindrical die 10.
  • Numeral 14 is a core punch
  • numeral 16 is a sleeve punch disposed in a molding cavity 18 formed between the core punch 14 and the cylindrical die 10 so as to move backwardly according as extruding of the compacted material.
  • a mold 13 is constructed from the cylindrical die 10, the bottom die 12, the core punch 14 and the sleeve punch 16.
  • the core punch 14 is provided with a slender part 22 downward in the drawing, and the bottom die 12 is formed with a hollow part 24 in a position corresponding to the slender part 22.
  • a compacted material 20 of the rare earth magnet is charged in the cylindrical die 10 of the mold 13 as shown Figure 1A, and the compacted material 20 is heated at a predetermined temperature together with the mold 13.
  • the mold 13 and the compacted material 20 are so designed as to be housed in a closed chamber, and the extruding of the compacted material 20 will be carried out in a non-oxidative atmosphere by evacuating the closed chamber lower than 1 Torr or replacing the atmosphere of the closed chamber with inactive gases such as argon.
  • the compacted material 20 is formed in a hollow circular plate-like shape as a whole, and made the inner peripheral part 26 higher than the outer peripheral part 28 by projecting the center portion in the axial direction.
  • the compacted material 20 is formed with difference in level between a part to be in contact with a pressing face at the end of the core punch 14 and a part to be faced with the molding cavity 18.
  • the core punch 14 and the sleeve punch 16 disposed coaxially are inserted in the cylindrical die 10 as shown in Figure 1B, and the end faces of the core punch 14 and the sleeve punch 16 are made in contact with the inner peripheral part 26 and the outer peripheral part 28 of the compacted material 20, respectively.
  • the compacted material 20 is deformed plastically and extruded backwardly by pressing the core punch 14 in the downward direction as shown in Figure 1 C, thereby obtaining a cylindrical extrusion 25 (magnetic material).
  • the sleeve punch 16 compresses downwardly a free surface of the compacted material 20 extruded into the molding cavity 18 of the mold 13 and goes back according as proceeding of the extruding of the compacted material 20.
  • the extrusion 25 extruded from the compacted material 20 as shown in Figure 1C is taken out from the mold 13 by moving the bottom die 12 relatively from the cylindrical die 10, and magnetized in the radial direction according to well-known procedures. Whereby the cylindrical extrusion 25 becomes to a rare earth magnet with radial anisotropy.
  • the results of measurement of the magnetic properties of the obtained anisotropic rare earth magnet were shown in Table 1.
  • the measured values in Table denote the magnetic properties in the radial direction at the portion of upper 5mm length of the obtained cylindrical rare earth magnet.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (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)
EP19930302736 1992-04-09 1993-04-07 Méthode de production d'un aimant de terre rare anisotrope Expired - Lifetime EP0565363B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP4116821A JP3057897B2 (ja) 1992-04-09 1992-04-09 異方性希土類磁石の製造方法
JP116821/92 1992-04-09

Publications (2)

Publication Number Publication Date
EP0565363A1 true EP0565363A1 (fr) 1993-10-13
EP0565363B1 EP0565363B1 (fr) 1996-06-26

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP19930302736 Expired - Lifetime EP0565363B1 (fr) 1992-04-09 1993-04-07 Méthode de production d'un aimant de terre rare anisotrope

Country Status (3)

Country Link
EP (1) EP0565363B1 (fr)
JP (1) JP3057897B2 (fr)
DE (1) DE69303313T2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
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

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101979881B (zh) * 2010-11-25 2013-02-06 湖南湘电长沙水泵有限公司 一种控制叶轮叶片流线尺寸的检测方法
JP2013098485A (ja) * 2011-11-04 2013-05-20 Toyota Motor Corp 希土類磁石の製造装置と製造方法

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0334478A2 (fr) * 1988-03-24 1989-09-27 General Motors Corporation Fabrication de fractions à large volume du type RE-Fe-B, matériau magnétiquement aligné, par écrasement
EP0392799A1 (fr) * 1989-04-14 1990-10-17 Daido Tokushuko Kabushiki Kaisha Procédé et dispositif pour fabriquer un aimant anatropique en terre rare

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0334478A2 (fr) * 1988-03-24 1989-09-27 General Motors Corporation Fabrication de fractions à large volume du type RE-Fe-B, matériau magnétiquement aligné, par écrasement
EP0392799A1 (fr) * 1989-04-14 1990-10-17 Daido Tokushuko Kabushiki Kaisha Procédé et dispositif pour fabriquer un aimant anatropique en terre rare

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 14, no. 493 (E-0995)26 October 1990 & JP-A-02 203 510 ( DAIDO STEEL CO ) 13 August 1990 *
PATENT ABSTRACTS OF JAPAN vol. 15, no. 387 (E-1117)30 September 1991 & JP-A-03 155 107 ( DAIDO STEEL CO ) 3 July 1991 *

Cited By (2)

* Cited by examiner, † Cited by third party
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
US6627326B2 (en) 2000-01-11 2003-09-30 Delphi Technologies, Inc. Manufacturing technique for multi-layered structure with magnet using an extrusion process

Also Published As

Publication number Publication date
DE69303313T2 (de) 1996-12-05
JPH05291024A (ja) 1993-11-05
JP3057897B2 (ja) 2000-07-04
EP0565363B1 (fr) 1996-06-26
DE69303313D1 (de) 1996-08-01

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