DE4228520A1 - Shaped plastics bonded permanent magnet prodn. - involves room temp. pressing and hot moulding stages - Google Patents

Shaped plastics bonded permanent magnet prodn. - involves room temp. pressing and hot moulding stages

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Publication number
DE4228520A1
DE4228520A1 DE4228520A DE4228520A DE4228520A1 DE 4228520 A1 DE4228520 A1 DE 4228520A1 DE 4228520 A DE4228520 A DE 4228520A DE 4228520 A DE4228520 A DE 4228520A DE 4228520 A1 DE4228520 A1 DE 4228520A1
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Prior art keywords
pressing
stage
magnetic
tool
prodn
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Granted
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DE4228520A
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German (de)
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DE4228520C2 (en
Inventor
Georg Werner Dipl Phys Reppel
Heinz-Dieter Zilg
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Vacuumschmelze GmbH and Co KG
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Vacuumschmelze GmbH and Co KG
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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
    • B22F3/02—Compacting only
    • 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
    • H01F1/0578—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 bonded together
    • 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
    • H01F41/14—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 applying magnetic films to substrates
    • H01F41/16—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 applying magnetic films to substrates the magnetic material being applied in the form of particles, e.g. by serigraphy, to form thick magnetic films or precursors therefor
    • 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
    • B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy

Abstract

In the prodn. of shaped, plastics bonded, esp. anisotropic permanent magnets by pressing a mixt. of magnetic powder and plastics binder, the pressing involves a first stage of room temp. pressing in a first tool and a second stage of press moulding in a second tool at an elevated temp. at which the pressed body is elastically deformable. The magnetic powder consists of a magnetic rare earth-iron-boron magnetic alloy. The first and second pressing stages are carried out in the same pressing direction, the first stage being carried out in a magnetic field of direction parallel to the pressing direction and the second stage being carried out at a higher pressure. The first and/or second stage may consist of several individual pressing operations. ADVANTAGE - The process allows prodn. of thin-walled shaped permanent magnets, e.g. shell magnets with a large opening angle e.g. of more than 90 deg. and a low thickness e.g. of less than 3 mm.

Description

Die Erfindung betrifft ein Verfahren zur Herstellung von kunststoffgebundenen, insbesondere anisotropen Dauer­ magnetformteilen durch Pressen einer Mischung von Magnet­ pulver und Kunststoffbinder in einem Werkzeug.The invention relates to a method for producing plastic-bound, especially anisotropic duration magnet molded parts by pressing a mixture of magnets powder and plastic binder in one tool.

Ein solches Verfahren ist beispielsweise aus der EP-OS 284 033 bekannt. Gemäß diesem Verfahren werden Pulver aus raschabgeschreckten Seltenerd-Eisen-Bor-Legierungen mit verschiedenen Bindemitteln gemischt. Durch Pressen der Mischung in einem ausrichtenden Magnetfeld wird das Dauermagnetformteil hergestellt. Auf diese Weise lassen sich jedoch nur relativ einfach geformte Dauermagnetteile herstellen. Bei der Herstellung von dünnwandigen Dauer­ magnetformteilen, wie z. B. Schalenmagneten mit großem Öffnungswinkel und geringer Magnetdicke kann dieses bekannte pulvermetallurgische Herstellungsverfahren jedoch nicht in befriedigender Weise eingesetzt werden. Dies trifft insbesondere dann zu, wenn die Preßrichtung senkrecht zur Magnetdicke gewählt wird. Wird die Preß­ richtung parallel zur Magnetlänge gewählt, bestehen Füll­ schwierigkeiten und das Verfahren ist daher unwirtschaft­ lich. In diesem Falle sind zudem nur kurze Magnetlängen herstellbar. Es wurde daher auch bereits vorgeschlagen, solche Magnetformteile im Spritzgußverfahren herzu­ stellen. Aufgrund der niedrigen Packungsdichte des Magnetpulvers werden dort jedoch nur niedrige Remanenz­ werte erreicht. Aus diesen Gründen werden daher häufig Schalenmagnete aus Einzelmagneten zusammengesetzt. Durch die erforderliche Bearbeitung und Montage der Einzel­ magnete sind in diesem Fall jedoch die Herstellungskosten sehr hoch. Zudem fallen bei der Herstellung der vielen Einzelmagnete hohe Preßkosten an.Such a method is for example from the EP-OS 284 033 known. According to this process, powders are made rapidly quenched rare earth iron boron alloys mixed different binders. By pressing the Mixing in an aligning magnetic field will Permanent magnet molded part manufactured. Let it this way but only relatively simple shaped permanent magnet parts produce. When producing thin-walled duration magnetic molded parts, such as. B. shell magnet with large Opening angle and low magnet thickness can do this known powder metallurgical manufacturing processes however, are not used in a satisfactory manner. This is especially true when the pressing direction perpendicular to the magnet thickness is selected. Will the press direction parallel to the magnet length, there is filling difficulties and the process is therefore uneconomical Lich. In this case there are also only short magnet lengths producible. It has therefore already been proposed such magnetic molded parts in the injection molding process put. Due to the low packing density of the Magnetic powder, however, only has a low remanence values reached. For these reasons, therefore, are common  Shell magnets composed of individual magnets. By the necessary processing and assembly of the individual In this case, magnets are the manufacturing costs very high. In addition, many fall in the manufacture Single magnets at high pressing costs.

Aufgabe der Erfindung ist es daher, das eingangs beschriebene pulvermetallurgische Verfahren zur Her­ stellung von kunststoffgebundenen Dauermagnetformteilen derart abzuwandeln, daß damit auch dünnwandige Dauer­ magnetformteile, wie z. B. Schalenmagnete mit großem Öffnungswinkel von beispielsweise mehr als 90° und geringer Magnetdicke von beispielsweise weniger als 3 mm hergestellt werden können. Die Aufgabe wird bei dem erfindungsgemäßen Verfahren dadurch gelöst, daß das Pressen mehrstufig erfolgt und ein erstes Pressen in einem ersten Werkzeug bei Raumtemperatur und ein zweites Pressen zur weiteren Formgebung in einem zweiten Werkzeug bei einer erhöhten Temperatur, bei der der Preßkörper plastisch verformbar ist, beinhaltet.The object of the invention is therefore that initially described powder metallurgical processes for Her position of plastic-bonded permanent magnet molded parts to be modified in such a way that even thin-walled duration magnetic molded parts, such as. B. shell magnets with large Opening angle of, for example, more than 90 ° and low magnetic thickness of, for example, less than 3 mm can be produced. The task is with the Method according to the invention solved in that the Pressing takes place in several stages and a first pressing in a first tool at room temperature and a second one Presses for further shaping in a second tool at an elevated temperature at which the compact is plastically deformable.

Besonders vorteilhaft ist es, wenn das erste und das zweite Pressen in gleicher Preßrichtung erfolgen. Zur Orientierung des Magnetpulvers wird das erste Pressen vorzugsweise in einem Magnetfeld vorgenommen. Aus wirtschaftlichen Gründen ist es hierbei vorteilhaft, die Magnetfeldrichtung parallel zur Preßrichtung zu wählen. Durch das erste Pressen wird die Mischung aus Magnet­ pulver und Kunststoffbinder zu einem Quader oder ähnlichem kompaktiert. Dieser Preßschritt kann daher mit niedrigem Preßdruck durchgeführt werden.It is particularly advantageous if the first and that second presses take place in the same pressing direction. For Orientation of the magnetic powder becomes the first pressing preferably made in a magnetic field. Out for economic reasons it is advantageous here Select magnetic field direction parallel to the pressing direction. The first press turns the mixture into a magnet powder and plastic binder into a cuboid or similar compacted. This pressing step can therefore low pressure can be carried out.

Die weitere Formgebung des Dauermagnetformteils erfolgt dann mit dem zweiten Pressen, das vorteilhafter Weise in der gleichen Richtung wie das erste Pressen ausgeführt wird. Das zweite Pressen wird bei einer erhöhten Tempera­ tur durchgeführt, bei der der Preßkörper gut plastisch verformbar ist.The further shaping of the permanent magnet molding takes place then with the second pressing, which advantageously in in the same direction as the first pressing  becomes. The second pressing is at an elevated tempera tur carried out, in which the compact well plastic is deformable.

Zur Durchführung des zweiten Pressens können die Preßlinge beispielsweise außerhalb des Preßwerkzeuges erwärmt werden. Das zweite Pressen der erwärmten Preßlinge erfolgt hierbei im kalten Werkzeug. Es kann hierzu aber auch der kalte Preßling in ein erwärmtes Werkzeug ein­ gesetzt werden. Durch das zweite Pressen bei erhöhter Temperatur sind porenfreie korrosionsbeständige Dauer­ magnetformteile herstellbar. Die optimale Temperatur für das zweite Pressen ist von der Art des verwendeten Kunst­ stoffbinders abhängig. Die Temperatur muß bei diesem Preßschritt zumindest so hoch gewählt werden, daß die Plastizität des Preßlings die gewünschte Formgebung erlaubt.The pressings can be used to carry out the second pressing heated outside of the press tool, for example become. The second pressing of the heated compacts takes place in the cold tool. However, it can also the cold compact into a heated tool be set. By the second pressing at increased Temperature is non-porous, corrosion-resistant duration Magnetic molded parts can be produced. The optimal temperature for the second pressing is on the type of art used depending on the binder. The temperature at this Pressing step should be chosen at least so high that the Plasticity of the compact the desired shape allowed.

Der Preßdruck wird bei dem zweiten Pressen zumeist höher sein als beim ersten Pressen. Sowohl das erste Pressen, als auch das zweite Pressen können jedoch auch aus mehreren Einzelpressungen bestehen.The pressing pressure is usually higher in the second pressing than the first press. Both the first pressing, but also the second pressing can also be done there are several individual pressings.

Für das Verfahren werden vorzugsweise hochwertige Magnet­ pulver auf der Basis von Seltenerd-Eisen-Bor-Magnet- Legierungen verwendet. Die Art der Herstellung der Magnetlegierung und des Magnetpulvers ist dabei unerheb­ lich. Neben diesen bevorzugten Magnetpulvern können jedoch auch andere bekannte Magnetpulver verwendet werden. Geeignete Kunststoffbinder (z. B. Thermoplaste oder Duroplaste) sind an sich bekannt und bilden nicht den Gegenstand dieser Erfindung.High-quality magnets are preferred for the process powder based on rare earth iron boron magnet Alloys used. The way of making the Magnetic alloy and the magnetic powder is irrelevant Lich. In addition to these preferred magnetic powders however, other known magnetic powders are used become. Suitable plastic binders (e.g. thermoplastics or thermosets) are known per se and do not form the subject of this invention.

Die Erfindung wird im folgenden anhand der Ausführungs­ beispiele näher erläutert. The invention is based on the execution examples explained in more detail.  

Beispiel 1example 1

Aus einem NdFeB-Dauermagnetpulver mit einer mittleren Teilchengröße von 200 µm und einem Polyamid-Kunststoff­ binder im Gewichtsverhältnis 94 : 6 wird durch Mischen eine Masse hergestellt, die anschließend ohne Magnetfeld bei Raumtemperatur zu Quadern der Größe 20 × 20 × 3 mm gepreßt wird. Der Preßdruck beträgt hierbei p = 1 t/cm2. Anschließend wird der Preßling in 200°C heißem Gas für 15 min erwärmt. Der erwärmte Preßling wird unmittelbar danach in einem Schalenwerkzeug mit konvexem Unterstempel ohne Magnetfeld zu einem Schalenmagneten verpreßt. Der Preßdruck beim zweiten Pressen beträgt ebenfalls 1 t/cm2.From a NdFeB permanent magnet powder with an average particle size of 200 microns and a polyamide plastic binder in a weight ratio of 94: 6, a mass is produced by mixing, which is then pressed without a magnetic field at room temperature into cuboids 20 × 20 × 3 mm in size. The pressure here is p = 1 t / cm 2 . The compact is then heated in gas at 200 ° C. for 15 minutes. The heated compact is pressed immediately afterwards in a shell tool with a convex lower punch without a magnetic field to form a shell magnet. The pressing pressure in the second pressing is also 1 t / cm 2 .

Beispiel 2Example 2

Aus einer anisotropen NeFeB-Dauermagnetlegierung in Pulverform mit einer mittleren Korngröße von 200 µm und einem Polyamid-Kunststoffbinder wird durch Kneten der Komponenten bei erhöhter Temperatur eine Masse herge­ stellt, die 90 Gewichtsteile Dauermagnetpulver und 10 Gewichtsteile Kunststoffbinder enthält. Die noch flüssige Masse wird in ein Pulsmagnetfeld von 30 kA/cm eingebracht und erstarrt zwischen den Polschuhen eines Magneten der Stärke 4 kA/cm. Aus der Masse werden anschließend Pellets gefertigt, die in einem ersten Pressen in einem Magnet­ feld von 10 kA/cm zu Quadern verpreßt werden. Ein solcher Quader ist unter Angabe der Preßrichtung und der Magnet­ feldrichtung in Fig. 1 dargestellt. Das zweite Pressen erfolgt in der gleichen Weise wie in Beispiel 1. In Fig. 2 ist das so erhaltene Dauermagnetformteil darge­ stellt. Zusätzlich sind die Preßrichtung p und der Öffnungswinkel α eingezeichnet. Das zweite Pressen erfolgt in der gleichen Preßrichtung wie das erste Pressen. Mit diesem Verfahren wurden anisotrope Schalen­ magnete mit weitgehend radialer Vorzugsrichtung herge­ stellt. Die Magnete wiesen keine offene Porosität auf. A mass is produced from an anisotropic NeFeB permanent magnet alloy in powder form with an average grain size of 200 µm and a polyamide plastic binder by kneading the components at elevated temperature, which contains 90 parts by weight of permanent magnet powder and 10 parts by weight of plastic binder. The still liquid mass is introduced into a pulse magnetic field of 30 kA / cm and solidifies between the pole pieces of a magnet with a strength of 4 kA / cm. Pellets are then produced from the mass, which are pressed into cuboids in a first press in a magnetic field of 10 kA / cm. Such a cuboid is shown in Fig. 1, specifying the pressing direction and the magnetic field direction. The second pressing is carried out in the same manner as in Example 1. In Fig. 2, the permanent magnet molded part thus obtained is Darge. In addition, the pressing direction p and the opening angle α are shown. The second pressing takes place in the same pressing direction as the first pressing. With this method, anisotropic shell magnets with largely radial preferred direction were produced. The magnets showed no open porosity.

Beispiel 3Example 3

96 Gewichtsteile einer anisotropen NdFeB-Dauermagnet­ legierung in Pulverform wird mit 4 Gewichtsteilen eines Phenolharzpulvers (SP 309 der Fa. Bakelite) gemischt. Aus dieser Masse werden Teile in einem orientierenden Magnet­ feld von 11,5 kA/cm mit einem Preßdruck von 3 t/cm2 bei Raumtemperatur hergestellt. Das zweite Pressen der Teile erfolgt in einem auf 170°C erwärmten Werkzeug mit einem Druck von 6 t/cm2 ohne angelegtes Magnetfeld. Mit diesem Verfahren werden Magnete mit einer Remanenz von 0,70 T und einer Koerzitivfeldstärke von 10,0 kA/cm erhalten.96 parts by weight of an anisotropic NdFeB permanent magnet alloy in powder form is mixed with 4 parts by weight of a phenolic resin powder (SP 309 from Bakelite). Parts are made from this mass in an orienting magnetic field of 11.5 kA / cm with a pressure of 3 t / cm 2 at room temperature. The parts are pressed a second time in a tool heated to 170 ° C with a pressure of 6 t / cm 2 without an applied magnetic field. With this method magnets with a remanence of 0.70 T and a coercive force of 10.0 kA / cm are obtained.

Mit dem offenbarten Verfahren ist es somit möglich, dünnwandige anisotrope Schalenmagnete mit hoher Remanenz, großer Magnetlänge und großen Öffnungswinkeln nunmehr einfacher und kostengünstiger bzw. mit verbesserten Eigenschaften herzustellen.With the disclosed method it is thus possible thin-walled anisotropic shell magnets with high remanence, large magnet length and large opening angles now easier and cheaper or with improved To produce properties.

Claims (7)

1. Verfahren zur Herstellung von kunststoffgebundenen, insbesondere anisotropen Dauermagnetformteilen durch Pressen einer Mischung von Magnetpulver und Kunststoff­ binder in einem Werkzeug, dadurch gekennzeichnet, daß das Pressen mehrstufig erfolgt und ein erstes Pressen in einem ersten Werkzeug bei Raumtemperatur und ein zweites Pressen zur weiteren Formgebung in einem zweiten Werkzeug bei einer erhöhten Temperatur, bei der der Preßkörper plastisch verformbar ist, beinhaltet.1. A process for the production of plastic-bonded, in particular anisotropic permanent magnet molded parts by pressing a mixture of magnetic powder and plastic binder in one tool, characterized in that the pressing takes place in several stages and a first pressing in a first tool at room temperature and a second pressing for further shaping a second tool at an elevated temperature at which the pressing body is plastically deformable. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß das erste und das zweite Pressen in gleicher Preßrichtung erfolgen.2. The method according to claim 1, characterized in that the first and the second pressing in the same pressing direction respectively. 3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeich­ net, daß das erste Pressen in einem Magnetfeld erfolgt.3. The method according to claim 1 or 2, characterized net that the first pressing takes place in a magnetic field. 4. Verfahren nach Anspruch 3, dadurch gekennzeichnet, daß die Magnetfeldrichtung parallel zur Preßrichtung verläuft.4. The method according to claim 3, characterized in that the magnetic field direction parallel to the pressing direction runs. 5. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß der Preßdruck beim zweiten Pressen höher ist als beim ersten Pressen.5. The method according to any one of the preceding claims, characterized in that the pressure at the second Pressing is higher than the first pressing. 6. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß das erste Pressen und/oder das zweite Pressen aus mehreren Einzelpressungen besteht.6. The method according to any one of the preceding claims, characterized in that the first pressing and / or the second pressing consists of several individual pressings. 7. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß ein Magnetpulver auf der Basis von Seltenerd-Eisen-Bor-Magnetlegierungen verwendet wird.7. The method according to any one of the preceding claims, characterized in that a magnetic powder on the Base of rare earth iron boron magnetic alloys used becomes.
DE4228520A 1992-08-27 1992-08-27 Process for the production of thin-walled plastic-bonded permanent magnet molded parts, such as shell magnets Expired - Fee Related DE4228520C2 (en)

Priority Applications (1)

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DE4228520A DE4228520C2 (en) 1992-08-27 1992-08-27 Process for the production of thin-walled plastic-bonded permanent magnet molded parts, such as shell magnets

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DE4228520A DE4228520C2 (en) 1992-08-27 1992-08-27 Process for the production of thin-walled plastic-bonded permanent magnet molded parts, such as shell magnets

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DE4228520A1 true DE4228520A1 (en) 1994-03-03
DE4228520C2 DE4228520C2 (en) 2000-10-26

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19605264A1 (en) * 1996-01-22 1997-08-14 Aichi Steel Works Ltd Anisotropic compound magnet and its manufacturing process
DE19728418A1 (en) * 1996-07-04 1998-01-08 Aichi Steel Works Ltd Manufacturing process for anisotropic resin-bonded magnets
WO1999040592A1 (en) * 1998-02-09 1999-08-12 Lofo High Tech Film Gmbh Magnetic film and a method for the production thereof
DE19945619A1 (en) * 1999-09-23 2001-04-19 Bosch Gmbh Robert Press compound and method for producing a soft magnetic composite material with the press compound
EP1577920B1 (en) * 2004-03-19 2012-10-03 Siemens Aktiengesellschaft Electromagnetic trip relay
CN111112605A (en) * 2020-02-29 2020-05-08 江西开源自动化设备有限公司 Powder magnetic field forming method of rare earth permanent magnet

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Publication number Priority date Publication date Assignee Title
DE102004016950B3 (en) * 2004-04-06 2006-01-19 Siemens Ag Release relay with permanent magnet inside yoke has three coils surrounding arm of yoke and magnet mounted on other arm to give two magnetic field loops

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US4123297A (en) * 1977-03-21 1978-10-31 General Motors Corporation Forming curved thin magnets from rare earth-transition metal powders

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19605264A1 (en) * 1996-01-22 1997-08-14 Aichi Steel Works Ltd Anisotropic compound magnet and its manufacturing process
US6007757A (en) * 1996-01-22 1999-12-28 Aichi Steel Works, Ltd. Method of producing an anisotropic bonded magnet
DE19605264C2 (en) * 1996-01-22 2001-07-12 Aichi Steel Works Ltd Process for the production of anisotropically connected magnets
DE19728418A1 (en) * 1996-07-04 1998-01-08 Aichi Steel Works Ltd Manufacturing process for anisotropic resin-bonded magnets
DE19728418C2 (en) * 1996-07-04 2003-07-24 Aichi Steel Works Ltd Manufacturing process for anisotropic resin-bonded magnets
WO1999040592A1 (en) * 1998-02-09 1999-08-12 Lofo High Tech Film Gmbh Magnetic film and a method for the production thereof
US6464894B1 (en) 1998-02-09 2002-10-15 Vacuumschmelze Gmbh Magnetic film and a method for the production thereof
DE19945619A1 (en) * 1999-09-23 2001-04-19 Bosch Gmbh Robert Press compound and method for producing a soft magnetic composite material with the press compound
EP1577920B1 (en) * 2004-03-19 2012-10-03 Siemens Aktiengesellschaft Electromagnetic trip relay
CN111112605A (en) * 2020-02-29 2020-05-08 江西开源自动化设备有限公司 Powder magnetic field forming method of rare earth permanent magnet
CN111112605B (en) * 2020-02-29 2022-03-29 江西开源自动化设备有限公司 Powder magnetic field forming method of rare earth permanent magnet

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