GB1299490A - Improvements relating to anisotropic magnet bodies - Google Patents

Improvements relating to anisotropic magnet bodies

Info

Publication number
GB1299490A
GB1299490A GB30875/70A GB3087570A GB1299490A GB 1299490 A GB1299490 A GB 1299490A GB 30875/70 A GB30875/70 A GB 30875/70A GB 3087570 A GB3087570 A GB 3087570A GB 1299490 A GB1299490 A GB 1299490A
Authority
GB
United Kingdom
Prior art keywords
magnetic
partitions
magnetic field
extrusion
passage
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
Application number
GB30875/70A
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.)
PHILLIPS ELECTRONIC AND ASSOCI
Original Assignee
PHILLIPS ELECTRONIC AND ASSOCI
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 PHILLIPS ELECTRONIC AND ASSOCI filed Critical PHILLIPS ELECTRONIC AND ASSOCI
Publication of GB1299490A publication Critical patent/GB1299490A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/022—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the choice of material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/07—Flat, e.g. panels
    • B29C48/08—Flat, e.g. panels flexible, e.g. films
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/14—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the particular extruding conditions, e.g. in a modified atmosphere or by using vibration
    • B29C48/142—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the particular extruding conditions, e.g. in a modified atmosphere or by using vibration using force fields, e.g. gravity or electrical fields
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/14—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the particular extruding conditions, e.g. in a modified atmosphere or by using vibration
    • B29C48/146—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the particular extruding conditions, e.g. in a modified atmosphere or by using vibration in the die
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2503/00—Use of resin-bonded materials as filler
    • B29K2503/04—Inorganic materials
    • B29K2503/06—Metal powders, metal carbides or the like

Landscapes

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

Abstract

1299490 Extruding magnets PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd 25 June 1970 [28 June 1969] 30875/70 Heading B6A [Also in Division H1] The anisotropy of a permanent magnet, extruded from a mixture of powdered magnetic material and binder through a rectangular nozzle outlet 3 which is surrounded by a device which produces an orienting magnetic field, is improved by causing the mixture to flow between a plurality of shear orienting partitions 4 extending across and along the extrusion passage 2 and in planes substantially perpendicular to the direction of the magnetic field and terminate prior to the nozzle outlet. The permanent magnetic material may be alloys or mixtures e.g. manganese, bismuth, but preferably is a hexa-ferrite BaO, 6Fe2 03, in which the barium may partially or completely be replaced by strontium, calcium or lead, and the plate shaped particles are oriented by the shear effects of passage between the partitions 4 to align the easy axis of magnetization thereof, extending perpendicularly to the planes of the particles, with the orienting magnetic field. In the described embodiment, the permanent magnetic material is obtained by grinding the sintered product of barium carbonate or iron oxide. The orientating magnetic field comprises a D.C. magnetic field of 3 to 10 KOe which is applied through the length of the brass nozzle 1 by permanent magnetic devices, or by a device comprising spaced coils 7, soft-magnetic pole shoes 8, and a soft-magnetic frame 9 closing the magnetic circuit around the nozzle 1. The partitions 4 may comprise magnetic, or non- magnetic material e.g. bronze or brass, and in the described embodiment both the spacing between adjacent partitions 4 and the section of the passage 2 of the nozzle 1 in which they are located decreases in the direction of extrusion. The partitions 4 are of progressively decreasing length transversely from the axis of passage 2, and they taper from their centres to knife edges at their rearward, and desirably also at their forward edges. The extruded magnets may comprise synthetic resin or rubber binder which hardens after extrusion, or may be compressed and sintered after extrusion.
GB30875/70A 1969-06-28 1970-06-25 Improvements relating to anisotropic magnet bodies Expired GB1299490A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1932970A DE1932970C3 (en) 1969-06-28 1969-06-28 Application of the process for increasing the anisotropy of extruded bodies to the manufacture of permanent magnets and apparatus for carrying out this process

Publications (1)

Publication Number Publication Date
GB1299490A true GB1299490A (en) 1972-12-13

Family

ID=5738337

Family Applications (1)

Application Number Title Priority Date Filing Date
GB30875/70A Expired GB1299490A (en) 1969-06-28 1970-06-25 Improvements relating to anisotropic magnet bodies

Country Status (8)

Country Link
BE (1) BE752600A (en)
DE (1) DE1932970C3 (en)
DK (1) DK124504B (en)
ES (1) ES381206A1 (en)
FR (1) FR2049215B1 (en)
GB (1) GB1299490A (en)
NL (1) NL7009322A (en)
SE (1) SE352005B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4562019A (en) * 1979-02-23 1985-12-31 Inoue-Japax Research Incorporated Method of preparing plastomeric magnetic objects
EP0303151A1 (en) * 1987-08-11 1989-02-15 Bayer Ag Fine-grained magnetic hexaferrite pigments containing boron, process for their production and their use
GB2218979A (en) * 1988-05-24 1989-11-29 Ube Industries Ceramics

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1103114A (en) * 1963-08-28 1968-02-14 Rasmussen O B Thermoplastic sheet material, method of producing it, and method of making fibrous articles therefrom

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4562019A (en) * 1979-02-23 1985-12-31 Inoue-Japax Research Incorporated Method of preparing plastomeric magnetic objects
EP0303151A1 (en) * 1987-08-11 1989-02-15 Bayer Ag Fine-grained magnetic hexaferrite pigments containing boron, process for their production and their use
GB2218979A (en) * 1988-05-24 1989-11-29 Ube Industries Ceramics
DE3917027A1 (en) * 1988-05-24 1989-11-30 Ube Industries METHOD FOR PRODUCING CERAMIC
US4937214A (en) * 1988-05-24 1990-06-26 Ube Industries Co., Ltd. Process for production of crystal grain-oriented ceramics
GB2218979B (en) * 1988-05-24 1992-07-15 Ube Industries Process for the production of crystal grain-oriented ceramics

Also Published As

Publication number Publication date
FR2049215A1 (en) 1971-03-26
DE1932970B2 (en) 1977-10-06
ES381206A1 (en) 1973-04-16
FR2049215B1 (en) 1975-01-10
NL7009322A (en) 1970-12-30
BE752600A (en) 1970-12-28
DE1932970A1 (en) 1971-01-07
DK124504B (en) 1972-10-23
DE1932970C3 (en) 1978-05-24
SE352005B (en) 1972-12-18

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee