EP0272243A2 - Apparatus for making pressed objects - Google Patents

Apparatus for making pressed objects Download PDF

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Publication number
EP0272243A2
EP0272243A2 EP87890279A EP87890279A EP0272243A2 EP 0272243 A2 EP0272243 A2 EP 0272243A2 EP 87890279 A EP87890279 A EP 87890279A EP 87890279 A EP87890279 A EP 87890279A EP 0272243 A2 EP0272243 A2 EP 0272243A2
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EP
European Patent Office
Prior art keywords
die
magnetic field
parts
magnetic
materials
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.)
Withdrawn
Application number
EP87890279A
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German (de)
French (fr)
Other versions
EP0272243A3 (en
Inventor
Helmut Wolf
Stephan Dr. Gründorfer
Harald D.I. Fillunger
Ferdinand Bergmann
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.)
Andritz Hydro GmbH Austria
Original Assignee
Andritz Hydro GmbH Austria
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 Andritz Hydro GmbH Austria filed Critical Andritz Hydro GmbH Austria
Publication of EP0272243A2 publication Critical patent/EP0272243A2/en
Publication of EP0272243A3 publication Critical patent/EP0272243A3/en
Withdrawn legal-status Critical Current

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    • 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

Definitions

  • the invention relates to a device for producing compacts from a material which can be aligned in a magnetic field, the pressing force from the material in powder form acting perpendicular to the direction of the magnetic field.
  • the object of the invention is therefore to provide a device of the type mentioned at the outset with which the highest possible and homogeneous magnetic field can be generated at the location of the powder.
  • the invention is characterized in that a magnetically anisotropic die is provided with a pronounced preferential direction for the magnetic flux, the magnetic flux being guided through the pressing chamber in a concentrated manner.
  • the die is made of different materials which have different magnetic properties, the materials with the same magnetic properties being diametrically opposed with respect to the press space.
  • a material of the die has a high magnetic conductivity, which facilitates the guidance of the magnetic flux.
  • the other material has the lowest possible conductance, so that it behaves similarly to air for the magnetic flux. The diametrical arrangement of the two materials enables concentrated guidance of the magnetic flux.
  • the die is composed of individual parts. This enables sharper magnetic transitions in the magnetic properties. There is also a further improvement in the concentration of the magnetic flux.
  • the individual parts of the die are joined together by wedging and / or toothing, for example by means of dovetail connections. This simply ensures that the individual parts are put together.
  • the die is pre-consolidated, for example by forging the parts. Pre-consolidation is necessary to absorb the reaction forces during the pressing process, since yes at the same time the form accuracy of the die must be observed.
  • a special embodiment of the invention is that the pressing space of the die is lined with removable moldings. As a result, the removable parts can be molded together with the compact. Relative movements between fittings and compact are avoided.
  • the shaped pieces are made of a material with a high surface hardness. This prevents the material to be pressed from being pressed into the surface of the die and thereby adversely affecting the dimensional accuracy and the formability.
  • the shaped pieces are arranged with a conical seat in the die.
  • This conical seat serves for better formability.
  • the shaped pieces are made from materials with different magnetic properties.
  • This embodiment of the invention serves the further concentration of the magnetic flux up to the press room.
  • Fig. 1 shows the floor plan
  • Fig. 2 shows a section through the die.
  • a die 1 which consists of four parts 2 and 3, is shown.
  • the parts 2 of the die 1 consist of a material that has a high magnetic conductivity.
  • the parts 3 of the die are made of a material that has a low magnetic conductivity. Through the diametrical
  • the materials are arranged in a concentrated manner to guide the magnetic flux through the press space 4.
  • the arrangement of the toothing and / or wedging, for example the dovetail connection in FIG. 1, can be chosen in a suitable form.
  • the individual parts 2 and 3 of the die are joined together, for example, by means of dovetail connections 6 and, if appropriate, a suitable pre-fabrication.
  • the pressing chamber 4, in which the compact 7 is located is lined with removable moldings 8.
  • Doe fittings 8 are arranged with a conical seat in the die.
  • the fittings 8 are made of equivalent materials, such as parts 2 and 3 of the die 1.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing Cores, Coils, And Magnets (AREA)
  • Forging (AREA)
  • Press Drives And Press Lines (AREA)

Abstract

Various methods are known for producing pressed objects in a magnetic field. In one of these types of production, the pressing force acts normal to the magnetic field. The object of the invention is to provide an apparatus with which as high and as homogeneous a magnetic field as possible is achieved in the pressing space. According to the figure, the die consists of four parts 2 and 3 respectively, the parts 2 consisting of a material having high permeance, or vice versa. The pressing space 4 may also be lined with shaped parts whose material is equivalent to that of the parts 2,3. The advantage of the invention is that the pressed object 7 produced has optimum magnetic properties. <IMAGE>

Description

Die Erfindung betrifft eine Einrichtung zur Herstellung von Preßlingen aus einem in einem Magnetfeld ausricht­barem Material, wobei die Preßkraft aus das in Pulver­form vorliegende Material senkrecht zur Richtung des Magnetfeldes wirkt.The invention relates to a device for producing compacts from a material which can be aligned in a magnetic field, the pressing force from the material in powder form acting perpendicular to the direction of the magnetic field.

Es sind im Prinzip drei verschiedene Methoden bekannt, Preßlinge im Magnetfeld herzustellen. Bei der ersten Methode wirkt die Preßkraft parallel zum Magnetfeld und bei der zweiten Methode wirkt die Preßkraft normal zum Magnetfeld. Bei der dritten bekannten Methode wird isostatisch gepreßt. Nachteilig bei der ersten Methode ist, daß die Ausrichtung des Pulvermaterials im Magnet­feld durch die Preßkraft wieder teilweise gestört wird. Bei speziellen Formgebungen ist aber keine andere Möglichkeit gegeben, als diesen Nachteil in Kauf zu nehmen. Etwa ein Zehntel höhere magnetische Werte werden mit der zweiten Methode erreicht.In principle, three different methods are known for producing compacts in a magnetic field. In the first method the pressing force acts parallel to the magnetic field and in the second method the pressing force acts normally to the magnetic field. The third known method uses isostatic pressing. A disadvantage of the first method is that the alignment of the powder material in the magnetic field is again partially disturbed by the pressing force. With special shapes, there is no other option than to accept this disadvantage. About a tenth higher magnetic values are achieved with the second method.

Sicherlich die aufwendigste Art der Herstellung ist gegeben, wenn das Pulvermaterial isostatisch verpreßt wird. Außerdem kann dabei praktisch nicht vorgeformt werden.Certainly the most complex type of production is when the powder material is pressed isostatically. In addition, it can practically not be preformed.

Aufgabe der Erfindung ist es daher, eine Einrichtung der eingangs genannten Art zu schaffen, mit der am Ort des Pulvers ein möglichst hohes und homogenes Magnet­feld erzeugt werden kann.The object of the invention is therefore to provide a device of the type mentioned at the outset with which the highest possible and homogeneous magnetic field can be generated at the location of the powder.

Die Erfindung ist dadurch gekennzeichnet, daß eine magnetisch anisotrope Matrize mit einer ausgeprägten Vorzugsrichtung für den magnetischen Fluß vorgesehen ist, wobei der magnetische Fluß konzentriert durch den Preßraum geführt ist.The invention is characterized in that a magnetically anisotropic die is provided with a pronounced preferential direction for the magnetic flux, the magnetic flux being guided through the pressing chamber in a concentrated manner.

Mit der Erfindung ist es erstmals möglich, Preßlinge, die auch optimale magnetische Eigenschaften aufweisen, mit einer herkömmlichen Stempelpresse herzustellen. Dies ist darauf zurückzuführen, daß der Preßling im Magnetfeld stärker und gleichmäßiger ausgerichtet ist. Bei einer derartigen erfindungsgemäßen Herstellung der Preßlinge ist weiters der Vorteil gegeben, daß der Aufwand für das benötigte Magnetfeld gering ist, weil der Magnetfluß durch die Ausformung der Matrize konzen­triert durch den Preßraum geführt ist.With the invention it is possible for the first time to produce compacts which also have optimal magnetic properties, with a conventional stamp press. This is due to the fact that the compact is aligned more strongly and more evenly in the magnetic field. In such a production of the compacts according to the invention there is the further advantage that the effort for the required magnetic field is low because the magnetic flux is guided through the molding space in a concentrated manner through the shaping of the die.

Nach einem weiteren Merkmal der Erfindung ist die Matrize aus verschiedenen Materialien, die unterschied­liche magnetische Eigenschaften aufweisen, hergestellt, wobei in Bezug auf den Preßraum die Materialien mit gleichen magnetischen Eigneschaften diametral gegen­überliegen. Ein Material der Matrize weist einen hohen magnetischen Leitwert auf, der die Führung des Magnet­flusses erleichtert. Das andere Material weist einen möglichst geringen Leitwert auf, sodaß es sich für den Magnetfluß ähnlich wie Luft verhält. Durch die diame­trale Anordnung der beiden Materialien ist eine konzen­trierte Führung des Magnetflusses möglich.According to a further feature of the invention, the die is made of different materials which have different magnetic properties, the materials with the same magnetic properties being diametrically opposed with respect to the press space. A material of the die has a high magnetic conductivity, which facilitates the guidance of the magnetic flux. The other material has the lowest possible conductance, so that it behaves similarly to air for the magnetic flux. The diametrical arrangement of the two materials enables concentrated guidance of the magnetic flux.

Gemäß einem besonderen Merkmal der Erfindung ist die Matrize aus einzelnen Teilen zusammengesetzt. Dadurch sind schärfere magnetische Übergänge der magnetischen Eigenschaften möglich. Eine weitere Verbesserung der Konzentration des magnetischen Flusses ist auch gege­ben.According to a special feature of the invention, the die is composed of individual parts. This enables sharper magnetic transitions in the magnetic properties. There is also a further improvement in the concentration of the magnetic flux.

Nach einem weiteren Merkmal der Erfindung sind die einzelnen Teile der Matrize durch Verkeilung und/oder Verzahnung beispielsweise mittels Schwalbenschwanzver­bindungen zusammengefügt. Dadurch wird die Zusammenfü­gung der einzelnen Teile einfach gewährleistet.According to a further feature of the invention, the individual parts of the die are joined together by wedging and / or toothing, for example by means of dovetail connections. This simply ensures that the individual parts are put together.

Gemäß einer weiteren Ausgestaltung der Erfindung ist die Matrize vorverfestigt, z.B. durch Verschmiedung der Teile. Die Vorverfestigung ist notwendig für die Auf­nahme der Reaktionskräfte beim Preßvorgang, da ja gleichzeitig die Formgenauigkeit der Matrize eingehal­ten werden muß.According to a further embodiment of the invention, the die is pre-consolidated, for example by forging the parts. Pre-consolidation is necessary to absorb the reaction forces during the pressing process, since yes at the same time the form accuracy of the die must be observed.

Eine besondere Ausgestaltung der Erfindung ist, daß der Preßraum der Matrize mit herausnehmbaren Formstücken ausgekleidet ist. Dadurch können die herausnehmbaren Teile gemeinsam mit dem Preßling ausgeformt werden. Relativbewegungen zwischen Formstücken und Preßling werden so vermieden.A special embodiment of the invention is that the pressing space of the die is lined with removable moldings. As a result, the removable parts can be molded together with the compact. Relative movements between fittings and compact are avoided.

Gemäß einem weiteren Merkmal der Erfindung sind die Formstücke aus einem Material mit hoher Oberflächenhä­rte hergestellt. Dadurch wird verhindert, daß sich das zu verpressende Material in die Oberfläche der Matrize eindrückt und dadurch die Formgenauigkeit und die Ausformbarkeit beeinträchtigt.According to a further feature of the invention, the shaped pieces are made of a material with a high surface hardness. This prevents the material to be pressed from being pressed into the surface of the die and thereby adversely affecting the dimensional accuracy and the formability.

Nach einer weiteren Ausgestaltung der Erfindung sind die Formstücke mit einem konischen Sitz in der Matrize angeordnet. Dieser konische Sitz dient der besseren Ausformbarkeit.According to a further embodiment of the invention, the shaped pieces are arranged with a conical seat in the die. This conical seat serves for better formability.

Nach einem weiteren Markmal der Erfindung sind die Formstücke aus Materialien mit unterschiedlichen magne­tischen Eigenschaften hergestellt. Diese Ausgestaltung der Erfindung dient der weiteren Konzentrierung des magnetischen Flusses bis zum Preßraum.According to a further feature of the invention, the shaped pieces are made from materials with different magnetic properties. This embodiment of the invention serves the further concentration of the magnetic flux up to the press room.

Die Erfindung wird an Hand eines in der Zeichnung dargestellten Ausführungsbeispieles näher erläutert. Fig. 1 zeigt den Grundriß und Fig. 2 einen Schnitt durch die Matrize.The invention is explained in more detail with reference to an embodiment shown in the drawing. Fig. 1 shows the floor plan and Fig. 2 shows a section through the die.

Gemäß der Fig. 1 ist eine Matrize 1, die aus vier Teilen 2 bzw. 3 besteht, dargestellt. Die Teile 2 der Matrize 1bestehen aus einem Material, das einen hohen magnetischen Leitwert aufweist. Die Teile 3 der Matrize bestehen aus einem Material, das einen geringen magne­tischen Leitwert aufweist. Durch die diametrale Anordnung der Materialien ist eine konzentrierte Füh­rung des magnetischen Flusses durch den Preßraum 4 gegeben. Die Anordnung der Verzahnung und/oder Verkeilung, beispielsweise der Schwalbenschwanzverbin­dung in Fig.1, kann dabei in geeigneter Form gewählt werden.1, a die 1, which consists of four parts 2 and 3, is shown. The parts 2 of the die 1 consist of a material that has a high magnetic conductivity. The parts 3 of the die are made of a material that has a low magnetic conductivity. Through the diametrical The materials are arranged in a concentrated manner to guide the magnetic flux through the press space 4. The arrangement of the toothing and / or wedging, for example the dovetail connection in FIG. 1, can be chosen in a suitable form.

Um die Preßkräfte aufnehmen zu können, werden die einzelnen Teile 2 bzw. 3 der Matrize beispielsweise mittels Schwalbenschwanzverbindungen 6 und gegebenen­falls einer geeigneten Vorverfertigung zusammengefügt.In order to be able to absorb the pressing forces, the individual parts 2 and 3 of the die are joined together, for example, by means of dovetail connections 6 and, if appropriate, a suitable pre-fabrication.

Gemäß Fig. 2 ist der Preßraum 4, in dem sich der Preßling 7 befindet, mit herausnehmbaren Formstücken 8 ausgekleidet. Doe Formstücke 8 sind mit einem konischen Sitz in der Matrize angeordnet. Darüberhinaus sind auch die Formstücke 8 aus äquivalenten Materialien, wie die Teile 2 bzw. 3 der Matrize 1 gefertigt.2, the pressing chamber 4, in which the compact 7 is located, is lined with removable moldings 8. Doe fittings 8 are arranged with a conical seat in the die. In addition, the fittings 8 are made of equivalent materials, such as parts 2 and 3 of the die 1.

Claims (9)

1. Einrichtung zur Herstellung von Preßlingen aus einem in einem Magnetfeld ausrichtbarem Material, wobei die Preßkraft auf das in Pulverform vorliegende Material senkrecht zur Richtung des Magnetfeldes wirkt, dadurch gekennzeichnet, daß eine magnetisch anisotrope Matrize mit einer ausgeprägten Vorzugsrichtung für den magnetischen Fluß vorgesehen ist, wobei der magnetische Fluß konzentriert durch den Preßraum geführt ist.1. Device for producing compacts from a material which can be aligned in a magnetic field, the pressing force acting on the material in powder form perpendicular to the direction of the magnetic field, characterized in that a magnetically anisotropic die is provided with a pronounced preferred direction for the magnetic flux, the magnetic flux is concentrated through the press room. 2. Einrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Matrize aus verschiedenen Materialien, die unterschiedliche magnetische Eigenschaften aufweisen, hergestellt ist, wobei in Bezug auf den Preßraum die Materialien mit gleichen magneti­schen Eigenschaften diametral gegenüberliegen.2. Device according to claim 1, characterized in that the die is made of different materials having different magnetic properties, the materials with the same magnetic properties being diametrically opposed to one another with respect to the press space. 3. Einrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Matrize aus einzelnen Teilen zusammengesetzt ist.3. Device according to claim 1 or 2, characterized in that the die is composed of individual parts. 4. Einrichtung nach Anspruch 3, dadurch gekennzeichnet, daß die einzelnen Teile der Matrize durch Verkeilung und/oder Verzahnung beispielsweise mittels Schwalbenschwanzverbindungen zusammengefügt sind.4. Device according to claim 3, characterized in that the individual parts of the die are joined together by wedging and / or toothing, for example by means of dovetail connections. 5. Einrichtung nach mindestens einem der Anprüche 1 bis 4, dadurch gekennzeichnet, daß die Matrize vorverfestigt ist, z.B. durch Verschmiedung der Teile.5. Device according to at least one of claims 1 to 4, characterized in that the die is pre-consolidated, e.g. by forging the parts. 6. Einrichtung nach mindestens einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß der Preßraum der Matrize mit herausnehmbaren Formstücken ausgekleidet ist.6. Device according to at least one of claims 1 to 5, characterized in that the pressing space of the die is lined with removable moldings. 7. Einrichtung nach Anspruch 6, dadurch gekennzeichnet, daß die Formstücke aus einem Material mit hoher Oberflächenhärte hergestellt sind.7. Device according to claim 6, characterized in that the fittings are made of a material with a high surface hardness. 8. Einrichtung nach Anspruch 6 oder 7, dadurch gekennzeichnet, daß die Formstücke mit einem konischen Sitz in der Matrize angeordnet sind.8. Device according to claim 6 or 7, characterized in that the shaped pieces are arranged with a conical seat in the die. 9. Einrichtung nach einem der Ansprüche 6 bis 8, dadurch gekennzeichnet, daß die Formstücke aus Materialien mit unter­schiedlichen magnetischen Eigenschaften hergestellt sind.9. Device according to one of claims 6 to 8, characterized in that the shaped pieces are made of materials with different magnetic properties.
EP87890279A 1986-12-15 1987-12-04 Apparatus for making pressed objects Withdrawn EP0272243A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT3328/86 1986-12-15
AT0332886A AT391958B (en) 1986-12-15 1986-12-15 DEVICE FOR PRODUCING PRESSES

Publications (2)

Publication Number Publication Date
EP0272243A2 true EP0272243A2 (en) 1988-06-22
EP0272243A3 EP0272243A3 (en) 1990-01-10

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EP87890279A Withdrawn EP0272243A3 (en) 1986-12-15 1987-12-04 Apparatus for making pressed objects

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EP (1) EP0272243A3 (en)
AT (1) AT391958B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103042212A (en) * 2012-12-24 2013-04-17 中铝广西有色金源稀土股份有限公司 Combination tool set for compacting of magnetic materials
CN103042215A (en) * 2012-12-24 2013-04-17 中铝广西有色金源稀土股份有限公司 Combination method of tool for compacting of magnetic materials

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE541977C (en) * 1930-03-20 1932-01-16 Steatit Magnesia Akt Ges Split mold for pressing objects from powder or dough-like masses
US3694115A (en) * 1967-11-09 1972-09-26 Magnetfab Bonn Gmbh Molding apparatus for making anisotropic ring-shaped magnets with zones having a preferred radial direction
JPS5194406A (en) * 1975-02-19 1976-08-19 JISEIFUNMATSUSEIKEIPURESUYOKANAGATA
DE2629990A1 (en) * 1976-07-03 1978-01-05 Magnetfab Bonn Gmbh PRESSING TOOL FOR ANISOTROPIC PERMANENT MAGNETS

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61112310A (en) * 1984-11-07 1986-05-30 Sumitomo Bakelite Co Ltd Manufacture of permanent magnet

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE541977C (en) * 1930-03-20 1932-01-16 Steatit Magnesia Akt Ges Split mold for pressing objects from powder or dough-like masses
US3694115A (en) * 1967-11-09 1972-09-26 Magnetfab Bonn Gmbh Molding apparatus for making anisotropic ring-shaped magnets with zones having a preferred radial direction
JPS5194406A (en) * 1975-02-19 1976-08-19 JISEIFUNMATSUSEIKEIPURESUYOKANAGATA
DE2629990A1 (en) * 1976-07-03 1978-01-05 Magnetfab Bonn Gmbh PRESSING TOOL FOR ANISOTROPIC PERMANENT MAGNETS

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
JAPANESE PATENTS GAZETTE, section CH, week 7640, 19. August 1976, class L, no. 76-74732x [40], Derwent Publications Ltd, London, GB; & JP-A-51 094 406 (HITACHI METAL K.K.) 19-08-1976 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103042212A (en) * 2012-12-24 2013-04-17 中铝广西有色金源稀土股份有限公司 Combination tool set for compacting of magnetic materials
CN103042215A (en) * 2012-12-24 2013-04-17 中铝广西有色金源稀土股份有限公司 Combination method of tool for compacting of magnetic materials
CN103042215B (en) * 2012-12-24 2015-07-01 中铝广西有色金源稀土股份有限公司 Combination method of tool for compacting of magnetic materials
CN103042212B (en) * 2012-12-24 2015-07-01 中铝广西有色金源稀土股份有限公司 Combination tool set for compacting of magnetic materials

Also Published As

Publication number Publication date
EP0272243A3 (en) 1990-01-10
ATA332886A (en) 1990-06-15
AT391958B (en) 1990-12-27

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