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DE1855054U - PRESSING DEVICE FOR THE PRODUCTION OF MAGNETIC ANISOTROPIC BODIES, SUCH AS PERMANENT MAGNETS, USING PRESS DIE. - Google Patents

PRESSING DEVICE FOR THE PRODUCTION OF MAGNETIC ANISOTROPIC BODIES, SUCH AS PERMANENT MAGNETS, USING PRESS DIE.

Info

Publication number
DE1855054U
DE1855054U DE1960N0011845 DEN0011845U DE1855054U DE 1855054 U DE1855054 U DE 1855054U DE 1960N0011845 DE1960N0011845 DE 1960N0011845 DE N0011845 U DEN0011845 U DE N0011845U DE 1855054 U DE1855054 U DE 1855054U
Authority
DE
Germany
Prior art keywords
press die
production
pressing device
ferromagnetic
permanent magnets
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
DE1960N0011845
Other languages
German (de)
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.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
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 Philips Gloeilampenfabrieken NV filed Critical Philips Gloeilampenfabrieken NV
Publication of DE1855054U publication Critical patent/DE1855054U/en
Expired 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
    • H01F1/04—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
    • H01F1/086—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 sintered
    • 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
    • B30B11/008—Applying a magnetic field to the material
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/26—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on ferrites
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/26—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on ferrites
    • C04B35/2683—Other ferrites containing alkaline earth metals or lead
    • 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
    • H01F41/0206—Manufacturing of magnetic cores by mechanical means
    • H01F41/0246—Manufacturing of magnetic circuits by moulding or by pressing powder
    • 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)
  • Chemical & Material Sciences (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Powder Metallurgy (AREA)
  • Manufacturing Cores, Coils, And Magnets (AREA)
  • Soft Magnetic Materials (AREA)

Description

Vorrichtung zur Herstellung von magnetisch anisotropen Körpern unter Verwendung einer Preßmatrize. Device for the production of magnetically anisotropic bodies under Use of a press die.

Die Neuerung bezieht sich auf eine Vorrichtung zur Herstellung von zu sinternden magnetisch anisotropen Körpern unter Verwendung einer Preßmatrize aus nicht-oder kaum ferromagnetischem Material, die von der (den) Spule (n) eines ein magnetisches Gleichfeld erzeugenden Elektromagneten umgeben ist (sind), wobei die Stempel der Preßmatrize zugleich die Magnetpole des Elektromagneten bilden. Es ist bekannt, anisotrope Dauermagnete dadurch her- zustellen, daß kleine magnetisch anisotrope Teilchen eines ferromagnetischen Materials der Formel BaxSryPbz0. 6Fe20 x y z <- (in der x+y+z=1), während sie sich noch wenigstens einiger- maßen frei bewegen können, in einem starken Magnetfeld zusammengepreßt werden, wodurch sie zugleich magnetisch ausgerichtet werden, und das so erhaltene Konglomerat zu einem magnetisch anisotropen daueraagnetischen Körper zu sintern. Das Zusammenpressen erfolgt dabei in einer Vorrichtung, die mit einer oder mehreren Matrizen aus nicht-oder kaum ferromagnetischem Material und einem Elektromagneten versehen ist. Beim sogenannten faßpressen"ist die feinverteilte ferromagnetische Substanz in einer inerten Flüssigkeit suspendiert und enthält die Matrize Hilfsmittel zum Zuführen dieser Flüssigkeit. Beim sogenannten"Trockenpressen"soll man die ferromagnetischen Teilchen in der Matrize möglichst lange in zitternder Bewegung halten.The innovation relates to a device for the production of magnetically anisotropic bodies to be sintered using a press die made of non-ferromagnetic or hardly ferromagnetic material, which is (are) surrounded by the coil (s) of an electromagnet that generates a constant magnetic field the stamps of the press die also form the magnetic poles of the electromagnet. It is known to produce anisotropic permanent magnets to provide that small magnetically anisotropic particles of a ferromagnetic material of the formula BaxSryPbz0. 6Fe20 xyz <- (in which x + y + z = 1), while they are still at least some- can move freely, are pressed together in a strong magnetic field, whereby they are magnetically aligned at the same time, and the conglomerate obtained in this way to sinter to a magnetically anisotropic permanent magnetic body. The pressing takes place in a device which is provided with one or more matrices made of non-ferromagnetic or hardly ferromagnetic material and an electromagnet. In so-called barrel pressing, the finely divided ferromagnetic substance is suspended in an inert liquid and the die contains aids to supply this liquid. In so-called "dry pressing", the ferromagnetic particles in the die should be kept trembling for as long as possible.

Fig. 1 ist eine schematische Darstellung eines Längsschnittes eines Teiles einer bekannten Preßvorrichtung, bei der die Preßstempel zugleich als Pole eines Elektromagneten dienen. Hiermit wird im Preßling ein in Preßrichtung verlaufendes magnetisches Gleichfeld erzeugt. Das feinverteilte ferromagnetische aterial 1, dessen Teilchen magnetisch anisotrop sind, befindet sich, gegebenenfalls gemischt mit anderen Materialien, mit denen es bei der später stattfindenden Sinterung chemisch reagiert, in der Freßmatrize 2 aus nicht-oder kaum ferromagnetischem Material, z. B. aus Messing oder Aluminiumbronze. Die matrize ist von dem Spulenkörper 3 eines Elektromagneten umgeben, dessen Pole 4 und 5, bestehend aus einem ferromagnetischen Material, z.B. einem gut bearbeitbaren maschinenstahl, zugleich als Preßstempel dienen und die Teilchen des ferromagnetischen materals 1 gleichzeitig magnetisch ausrichten und zusammenpressen. Fig. 1 is a schematic representation of a longitudinal section of a Part of a known pressing device, in which the ram is also used as a pole serve as an electromagnet. This is a running in the pressing direction in the compact magnetic constant field generated. The finely divided ferromagnetic aterial 1, whose Particles are magnetically anisotropic, is located, optionally mixed with others Materials with which it reacts chemically during the subsequent sintering, in the Frßmatrize 2 made of non-ferromagnetic or hardly ferromagnetic material, for. B. made of brass or aluminum bronze. The die is from the bobbin 3 of an electromagnet the poles 4 and 5 of which are made of a ferromagnetic material, e.g. an easily machinable machine steel, at the same time serve as a press ram and the Align particles of the ferromagnetic material 1 magnetically at the same time and press together.

Wenn diese Teilchen in einer inerten Flüssigkeit suspendiert sind, wird diese Flüssigkeit während des Pressens aus der Matrize entfernt, z. B. über den Unterstempel 5, der dann auf der Oberseite eine Siebkette aufweist, die die suspendierten Teilchen nicht durchläßt. Sobald sich in der Matrize ein dichtes Konglomerat gebildet hat, wird letzteres, vorzugsweise nach vorangehender Entmagnetisierung (z. B. durch Umkehren der Richtung des elektrischen Stromes in der Spule 3), aus der Matrize entfernt, nötigenfalls getrocknet und dann bei einer Temperatur von meistens etwa 1100 bis 135000 gesintert.When these particles are suspended in an inert liquid, this liquid is removed from the die during pressing, e.g. B. over the lower punch 5, which then has a sieve chain on the top, which the does not let through suspended particles. As soon as there is a dense conglomerate in the die has formed, the latter, preferably after previous demagnetization (e.g. by reversing the direction of the electric current in coil 3) removed from the die, dried if necessary and then at a Sintered temperature of mostly around 1100 to 135000.

Ein Nachteil der beschriebenen Preßvorrichtung ist, daß die so erhaltenen Sinterkörper, besonders deren Oberfläche, oft Risse aufweisen, so daß der Ausschußprozentsatz bei der Herstellung ziemlich hoch ist. Dies ist besonders dann der Fall, wenn eine Preßvorrichtung verwendet wird, die es ermöglicht, gleichzeitig in mehreren Matrizen zu pressen, die gemeinsam von der Spule des Elektromagneten umgeben werden. Die Neuerung schafft ein Mittel, das diesen Nachteil ganz oder wenigstens teilweise beseitigt. A disadvantage of the pressing device described is that the so obtained Sintered bodies, especially their surface, often have cracks, so that the reject percentage at the time of manufacture is quite high. This is especially the case when a Pressing device is used, which makes it possible to work in several dies at the same time to press, which are surrounded together by the coil of the electromagnet. the Innovation creates a means of eliminating this disadvantage in whole or in part eliminated.

Nach der Neuerung bestehen bei einer Preßvorrichtung eingangs erwähnter Art wenigstens die dem Innenraum der Preßmatrize zugewandten Enden der Magnetpole aus nichtferromagnetischem Material. According to the innovation, there are those mentioned at the beginning in a pressing device Type at least the ends of the magnetic poles facing the interior of the press die made of non-ferromagnetic material.

Zur Erläuterung der Neuerung wird auf Fig. 2 hingewiesen, in der die Bezugsziffern nach Fig. 1 die gleiche Bedeutung haben wie in Fig. 1. Auch bei der Vorrichtung nach Fig. 2 dienen die Preßstempel zugleich als Pole des Elektromagneten. Auf den Magnetpolen 4 und 5 sind hier an den Enden Nessingschichten 6 bzw. 7 angeordnet. Anstatt Messing kann auch ein anderes nichtferromagnetisches Metall oder eine nichtferromagnetisohe Metallegierung und auch gegebenenfalls ein Kunststoffmaterial verwendet werden, wenn nur der mechanische Zusammenhang, die Festigkeit und Härte genügend groß sind. Vienn der Spulenkörper 3 eine Länge aufweist, die beträchtlich größer ist als die Höhe der Natrize und demzufolge ziemlich weit über und unter der Matrize vorspringt, kann man nach der Neuerung auch Preßstempel 4 und 5 verwenden, die ganz aus nichtferromagnetischem Material bestehen. To explain the innovation, reference is made to FIG. 2, in which the reference numerals according to FIG. 1 have the same meaning as in FIG. 1. Also in In the device of FIG. 2, the rams also serve as poles of the electromagnet. On the magnetic poles 4 and 5, Nessing layers 6 and 7 are arranged here at the ends. Instead of brass, another non-ferromagnetic metal or a non-ferromagnetic metal can be used Metal alloy and possibly also a plastic material are used, if only the mechanical connection, the strength and hardness are sufficiently great. Vienn the bobbin 3 has a length which is considerably greater than that Height of the natrize and consequently protrudes quite far above and below the die, you can also use rams 4 and 5 after the innovation, which are made entirely of non-ferromagnetic Material.

Bei Verwendung der Vorrichtung nach der Neuerung wird der Ausschuß infolge von Rissen in den Sinterkörpern stark herabgesetzt. So wird z. B. bei der Herstellung von anisotropen Dauermagneten, hauptsächlich bestehend aus der Verbindung BaFe12O19, dieser Ausschuß, der nach einer allgemein angewendeten Prüfungseorm 70 bis 90% betrug, durch Anwendung der Neuerung auf einen Betrag von 2 bis 6% reduziert. When using the device according to the innovation, the committee greatly reduced due to cracks in the sintered bodies. So z. B. at the Manufacture of anisotropic permanent magnets, mainly consisting of the compound BaFe12O19, this committee, which is based on a generally applied test standard 70 up to 90%, reduced to an amount of 2 to 6% by applying the innovation.

Die Neuerung ermöglicht es insbesondere, mit gutem Erfolg Preßvorrichtungen zu verwenden mit zwei oder mehreren Matrizen, die gemeinschaftlich von der Spule des Elektromagneten umgeben sind. Solche Preßvorrichtungen sind selbstverständlich für die massenerzeugung vorzuziehen, wenn nicht deren Verwendung, wie es bisher der Fall war, mit besonderen Nachteilen verknüpft ist. Diese Nachteile werden jedoch durch Anwendung der Neuerung ganz oder wenigstens teilweise beseitigt. The innovation makes it possible in particular, with good success, pressing devices to be used with two or more dies shared by the coil of the electromagnet are surrounded. Such pressing devices are self-evident preferable for mass production, if not its use, as it has been up to now was the case, is associated with particular disadvantages. However, these disadvantages will completely or at least partially eliminated by applying the innovation.

Die Neuerung kann ganz allgemein bei der Herstellung von magnetisch anisotropen Sinterkörpern angewendet werden, bei denen von einem feinverteilten magnetisch anisotropen Material oder von einem Gemisch, das ein solches Material enthält, ausgegangen wird. So ist sie, außer für die Herstellung von anisotropen Sintermagneten aus einem kristal- linischen Material mit der Formel BaxSrBbzOe203 (in der x y z <-) x+y+z==l), unter anderem auch anwendbar bei der Herstellung von magnetisch anisotropen Körpern, die im wesentlichen aus Verbindungen bestehen, deren Einkristalle eine Vorzugebene der magnetisierung aufweisen, ausgehend von einem Gemisch, das wenigstens eine Komponente enthält, deren Einkristalle eine Vorzugsrichtung der Magnetisierung aufweisen.The innovation can be used quite generally in the production of magnetically anisotropic sintered bodies in which a finely divided magnetically anisotropic material or a mixture containing such a material is assumed. So it is, except for the production of anisotropic sintered magnets from a crystal linear material with the formula BaxSrBbzOe203 (in the xyz <-) x + y + z == l), among other things also applicable in the production of magnetically anisotropic bodies which essentially consist of compounds whose single crystals have a predetermined magnetization, starting from a mixture which contains at least one component whose single crystals have a preferred direction of magnetization.

Schutzansprüche : Protection claims:

Claims (4)

Schutzansprü. che : 1. Vorrichtung zur Herstellung von zu sinternden magnetisch anisotropen Körpern unter Verwendung einer Preßmatrize aus nicht-oder kaum ferromagnetischem Material, die von der (den) Spule (n) eines ein magnetisches Gleichfeld erzeugenden Elektromagneten umgeben ist (sind), wobei die Stempel der Preßmatrize zugleich die Magnetpole des Elektromagneten bilden, dadurch gekennzeichnet, daß wenig- glektroma,-
stens die dem Innenraum der Breßmatrize (2) zugewandten Enden (6 und 7) der Magnetpole (4 und 5) aus nichtferromagnetischem Material bestehen.Protection claims. Che: 1. Device for the production of magnetically anisotropic bodies to be sintered using a press die made of non-ferromagnetic or hardly ferromagnetic material, which is (are) surrounded by the coil (s) of an electromagnet that generates a constant magnetic field, the punch the press die at the same time the magnetic poles of the Form electromagnets, characterized in that little- glektroma, -
At least the ends (6 and 7) of the magnetic poles (4 and 5) facing the interior of the Breßmatrize (2) are made of non-ferromagnetic material. 2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß wenigstens die dem Innenraum der Preßmatrize (2) zugewandten Enden (6 und 7) der Magnetpole (4 und 5) aus Messing bestehen.2. Apparatus according to claim 1, characterized in that at least the ends (6 and 7) of the magnetic poles facing the interior of the press die (2) (4 and 5) are made of brass. 3. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß wenigstens die dem Innenraum der Preßmatrize (2) zugewandten Enden (6 und 7) der Magnetpole (4 und 5) aus Kunststoff bestehen.3. Apparatus according to claim 1, characterized in that at least the ends (6 and 7) of the magnetic poles facing the interior of the press die (2) (4 and 5) are made of plastic. 4. Vorrichtung nach einem der bisherigen Ansprüche, dadurch gekennzeichnet, daß wenigstens zwei Preßmatrizen vorhanden sind, die von einer gemeinsamen Magnetspule um- gebensind.
4. Device according to one of the preceding claims, characterized in that at least two press dies are present, which are surrounded by a common solenoid are given.
DE1960N0011845 1959-11-04 1960-11-02 PRESSING DEVICE FOR THE PRODUCTION OF MAGNETIC ANISOTROPIC BODIES, SUCH AS PERMANENT MAGNETS, USING PRESS DIE. Expired DE1855054U (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL245034 1959-11-04

Publications (1)

Publication Number Publication Date
DE1855054U true DE1855054U (en) 1962-07-12

Family

ID=19752012

Family Applications (2)

Application Number Title Priority Date Filing Date
DE1960N0011845 Expired DE1855054U (en) 1959-11-04 1960-11-02 PRESSING DEVICE FOR THE PRODUCTION OF MAGNETIC ANISOTROPIC BODIES, SUCH AS PERMANENT MAGNETS, USING PRESS DIE.
DEN19124A Pending DE1109590B (en) 1959-11-04 1960-11-02 Device for the production of magnetically anisotropic bodies using a press die

Family Applications After (1)

Application Number Title Priority Date Filing Date
DEN19124A Pending DE1109590B (en) 1959-11-04 1960-11-02 Device for the production of magnetically anisotropic bodies using a press die

Country Status (6)

Country Link
CH (1) CH402205A (en)
DE (2) DE1855054U (en)
ES (1) ES262112A1 (en)
GB (1) GB959575A (en)
NL (1) NL104939C (en)
SE (1) SE303803B (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1241544B (en) * 1962-06-15 1967-06-01 Deutsche Edelstahlwerke Ag Press ram for the production of anisotropic pressed bodies from barium ferrite powder
GB1216479A (en) * 1966-12-14 1970-12-23 Nippon Paint Co Ltd Coating compositions
DE2527461C2 (en) * 1975-06-20 1987-01-02 Robert Bosch Gmbh, 7000 Stuttgart Process for the production of anisotropic segment magnets for electrical machines
DE102013205421A1 (en) * 2013-03-27 2014-10-16 Siemens Aktiengesellschaft Pressing tool for producing a magnet

Also Published As

Publication number Publication date
DE1109590B (en) 1961-06-22
GB959575A (en) 1964-06-03
CH402205A (en) 1965-11-15
SE303803B (en) 1968-09-09
NL104939C (en)
ES262112A1 (en) 1960-12-16

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