DE1270703B - Process for the production of permanent magnets - Google Patents

Process for the production of permanent magnets

Info

Publication number
DE1270703B
DE1270703B DE19631270703 DE1270703A DE1270703B DE 1270703 B DE1270703 B DE 1270703B DE 19631270703 DE19631270703 DE 19631270703 DE 1270703 A DE1270703 A DE 1270703A DE 1270703 B DE1270703 B DE 1270703B
Authority
DE
Germany
Prior art keywords
permanent magnets
magnetic
production
plastic
powder
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.)
Pending
Application number
DE19631270703
Other languages
German (de)
Inventor
Werner Mueller
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.)
Magnetfabrik Bonn GmbH
Original Assignee
Magnetfabrik Bonn GmbH
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 Magnetfabrik Bonn GmbH filed Critical Magnetfabrik Bonn GmbH
Priority to DE19631270703 priority Critical patent/DE1270703B/en
Publication of DE1270703B publication Critical patent/DE1270703B/en
Pending legal-status Critical Current

Links

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
    • H01F1/10—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 non-metallic substances, e.g. ferrites, e.g. [(Ba,Sr)O(Fe2O3)6] ferrites with hexagonal structure
    • H01F1/11—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 non-metallic substances, e.g. ferrites, e.g. [(Ba,Sr)O(Fe2O3)6] ferrites with hexagonal structure in the form of particles
    • H01F1/113—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 non-metallic substances, e.g. ferrites, e.g. [(Ba,Sr)O(Fe2O3)6] ferrites with hexagonal structure in the form of particles in a bonding agent
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Hard Magnetic Materials (AREA)
  • Manufacturing Cores, Coils, And Magnets (AREA)

Description

Verfahren zur Herstellung von Dauermagneten Die Erfindung betrifft ein Verfahren zur Herstellung von Dauermagneten aus Dauermagnetpulver und einem unmagnetischen, thermoplastischen Bindemittel, bei dem die Dauermagnete durch Pressen, Walzen, Spritzen, Extrudieren oder auf eine entsprechende Weise geformt werden.Method of Making Permanent Magnets The invention relates to a method for manufacturing permanent magnets from permanent magnet powder and a non-magnetic, thermoplastic binder, in which the permanent magnets are pressed, Rolling, spraying, extruding or shaped in a corresponding manner.

Es ist bekannt, derartige Mischungen durch die genannten Verfahren zu verarbeiten. Die so geformten Magnete besitzen um so bessere magnetische Werte, je höher der Anteil des Dauermagnetpulvers und je geringer der Anteil des Bindemittels sind. Bei einem gewissen Verhältnis von Dauermagnetpulver zu Bindemittel hört aber die Verarbeitbarkeit auf, so daß die Magnete Risse und Fehlstellen aufweisen und die Verarbeitungsmaschinen gefährdet werden.It is known that such mixtures can be produced by the processes mentioned to process. The magnets shaped in this way have all the better magnetic values, the higher the proportion of permanent magnet powder and the lower the proportion of binder are. At a certain ratio of permanent magnet powder to binder, however, it stops the processability, so that the magnets have cracks and defects and the processing machines are endangered.

Die Erfindung ermöglicht es, auch solche Mischungen aus Dauermagnetpulver und einem Bindemittel zu verarbeiten, die einen sehr hohen Bindemittelanteil besitzen. Sie ist dadurch gekennzeichnet, daß das Magnetpulver und der Kunststoff bei erhöhter Temperatur gemischt, die Mischung nach dem Erkalten zerkleinert und alsdann zusätzlich mit Kunststoff eingepudert wird. Diese eingepuderte Mischung weist eine erheblich verbesserte Verarbeitbarkeit auf und kann in der üblichen Weise gepreßt, gewalzt, gespritzt oder extrudiert werden.The invention also enables such mixtures of permanent magnet powder and to process a binder that has a very high proportion of binder. It is characterized in that the magnetic powder and the plastic at increased Temperature mixed, the mixture crushed after cooling and then additionally is powdered with plastic. This powdered mixture has a substantial improved processability and can be pressed, rolled, be injected or extruded.

Ein Beispiel der Erfindung sei im folgenden beschrieben: 19 kg Bariumferrit-Magnetpulver werden mit 1 kg eines thermoplastischen Bindemittels (z. B. Polyäthylen) unter Erwärmung auf etwa 70° C vermischt. Die nach dem Erkalten bröcklige Masse wird in einer Stiftmühle auf eine Teilchengröße von 0,1 bis 2 mm zerkleinert und mit 0,5 kg Feinstpulver desselben Kunststoffes eingepudert; dieses Feinstpulver hat eine Korngröße von weniger als 0,05, vorzugsweise weniger als 0,01 mm. Nunmehr kann die Mischung in an sich bekannter Weise verarbeitet werden. Es ergeben sich Dauermagnete mit 92,6 Gewichtsprozent Anteil des Magnetwerkstoffes.An example of the invention is described below: 19 kg of barium ferrite magnet powder are heated with 1 kg of a thermoplastic binder (e.g. polyethylene) mixed to about 70 ° C. The crumbly mass after cooling is in a pin mill crushed to a particle size of 0.1 to 2 mm and with 0.5 kg of fine powder the same plastic powdered; this very fine powder has a grain size of less than 0.05, preferably less than 0.01 mm. Now the mixture can in itself are processed in a known manner. The result is permanent magnets with 92.6 percent by weight Proportion of the magnet material.

Durch den erfindungsgemäß hohen Magnetwerkstoffanteil haben die nach diesem Verfahren hergestellten Magnetkörper besonders hohe magnetische Werte. Auch können enge maßliche Toleranzen eingehalten sowie Teile mit dünnen Wandstärken erzeugt werden.Due to the high proportion of magnetic material according to the invention, they have Magnetic bodies produced using this process have particularly high magnetic values. Even tight dimensional tolerances can be maintained and parts with thin walls can be produced will.

Claims (1)

Patentanspruch: Verfahren zur Herstellung von Dauermagneten aus Dauermagnetpulver und einem unmagnetischen, thermoplastischen Bindemittel, d a d u r c h gekennzeichnet, daß das Magnetpulver und der Kunststoff bei erhöhter Temperatur gemischt, die Mischung nach dem Erkalten zerkleinert und zusätzlich mit Kunststoff eingepudert wird und alsdann in an sich bekannter Weise zu Magnetkörpern geformt wird. In Betracht gezogene Druckschriften: Deutsche Patentschrift Nr. 968 668; deutsche Auslegesehrift Nr. 1012 705.Claim: Process for the production of permanent magnets from permanent magnet powder and a non-magnetic, thermoplastic binder, indicated by that the magnetic powder and the plastic mixed at an elevated temperature, the mixture after cooling is crushed and additionally powdered with plastic and then is formed into magnetic bodies in a manner known per se. Considered Publications: German Patent No. 968 668; German interpretation tool No. 1012 705.
DE19631270703 1963-12-18 1963-12-18 Process for the production of permanent magnets Pending DE1270703B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19631270703 DE1270703B (en) 1963-12-18 1963-12-18 Process for the production of permanent magnets

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19631270703 DE1270703B (en) 1963-12-18 1963-12-18 Process for the production of permanent magnets

Publications (1)

Publication Number Publication Date
DE1270703B true DE1270703B (en) 1968-06-20

Family

ID=5661070

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19631270703 Pending DE1270703B (en) 1963-12-18 1963-12-18 Process for the production of permanent magnets

Country Status (1)

Country Link
DE (1) DE1270703B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0062134A1 (en) * 1981-04-02 1982-10-13 VDO Adolf Schindling AG Permanent-magnet body from a composition of plastics and magnetic material, method for its production and eddy current tachometer with such a permanent-magnet body

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1012705B (en) * 1954-08-27 1957-07-25 Max Baermann Process for the production of synthetic resin-bonded permanent magnets
DE968668C (en) * 1950-06-01 1958-03-20 Max Baermann Process for stabilizing homogeneous ferromagnetic mixtures consisting of ferromagnetic particles of various grain sizes and a binder

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE968668C (en) * 1950-06-01 1958-03-20 Max Baermann Process for stabilizing homogeneous ferromagnetic mixtures consisting of ferromagnetic particles of various grain sizes and a binder
DE1012705B (en) * 1954-08-27 1957-07-25 Max Baermann Process for the production of synthetic resin-bonded permanent magnets

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0062134A1 (en) * 1981-04-02 1982-10-13 VDO Adolf Schindling AG Permanent-magnet body from a composition of plastics and magnetic material, method for its production and eddy current tachometer with such a permanent-magnet body

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