EP1240652B1 - Verfahren zur herstellung stabförmiger dauermagnete - Google Patents
Verfahren zur herstellung stabförmiger dauermagnete Download PDFInfo
- Publication number
- EP1240652B1 EP1240652B1 EP00985202A EP00985202A EP1240652B1 EP 1240652 B1 EP1240652 B1 EP 1240652B1 EP 00985202 A EP00985202 A EP 00985202A EP 00985202 A EP00985202 A EP 00985202A EP 1240652 B1 EP1240652 B1 EP 1240652B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pressed parts
- permanent magnets
- pressed
- weight
- elevations
- 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 - Lifetime
Links
Images
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
- B22F7/00—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression
- B22F7/06—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite workpieces or articles from parts, e.g. to form tipped tools
- B22F7/062—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite workpieces or articles from parts, e.g. to form tipped tools involving the connection or repairing of preformed parts
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F7/00—Magnets
- H01F7/02—Permanent magnets [PM]
- H01F7/0205—Magnetic circuits with PM in general
- H01F7/021—Construction of PM
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/49009—Dynamoelectric machine
- Y10T29/49012—Rotor
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/4902—Electromagnet, transformer or inductor
- Y10T29/49075—Electromagnet, transformer or inductor including permanent magnet or core
Definitions
- the invention relates to a method for producing permanent magnets, especially of rod-shaped permanent magnets.
- Permanent magnets of this type are required for motors and generators. They typically have a diameter between 10 and 50 mm and a length between 20 and 200 mm.
- the preferred magnetic direction of these permanent magnets can be axial or diametrical direction.
- EB-A-0 124 655 describes the basic features of a manufacturing process for permanent magnets based on rare earths, Known iron and boron. In the known method, first of all a melted alloy based on rare Earth, iron and boron pulverized and then in the magnetic field Green compacts pressed, which are then sintered.
- tablet-shaped pressed parts are particularly good pressed with a ratio of diameter to length close to 1 become. After sintering, they become these green compacts created permanent magnets first ground. The permanent magnets are then glued together so that their magnetic Preferred direction points in the same direction. To this Purpose it is necessary to stick the permanent magnets align with great accuracy. The required surface grinding, aligning and gluing the permanent magnets lead to high labor costs. Alignment in particular the permanent magnet requires a lot of work or time Devices.
- rod-shaped permanent magnets in one Piece Another option is rod-shaped permanent magnets in one Piece.
- the pressing of a long, rod-shaped Permanent magenta in the direction of its axis leads to more uneven Press density and the resulting large dimensional deviations.
- special presses with large Hub required, which due to the large distances only low cycle speeds can realize.
- the rod-shaped magnet perpendicular to its axis ("lying") to press.
- a suitable raw form for example a rounded cuboid shape can be pressed.
- the side faces of the Raw shape must be reground to create a circular shape To achieve cross-section, which is very expensive.
- the invention is based on this prior art the task is to create a method with which in particular Rod-shaped permanent magnets on simple and inexpensive Can be manufactured in this way.
- rod-shaped permanent magnets with good magnetic homogeneity are created.
- the method advantageously requires neither a complex grinding of finished permanent magnets tedious positioning of individual parts.
- the invention The process is therefore compared to conventional manufacturing processes much easier and cheaper.
- Figure 1 shows a rod-shaped permanent magnet 1, the several pressed parts 2 is assembled.
- Such permanent magnets 1 are required for motors and generators and show typically a diameter between 10 and 50 mm and a length between 20 and 200 mm.
- the permanent magnets 1 either have an axial magnetic preferred direction 3 or a diametrical magnetic preferred direction 4.
- the elevations 6 are preferably so formed that the diametrical magnetic preferred direction 4th the pressing parts 2 points in the same direction when the pressing parts 2 can be placed on top of each other.
- Figures 3 and 4 show cross sections through possible embodiments of the pressed parts 2. It can be clearly seen that next to the elevation 6 on the top 5 on a bottom 7 a recess 8 complementary to the elevation 6 is formed is, so that the pressed parts 2 are assembled seamlessly can.
- the elevation 6 and the depression 8 are preferred tapered to ensure trouble-free joining of the pressed parts 2 to enable.
- the dimensions of the recesses 8 and ridges 6 are chosen so that there is a joint gap of usual 0.05 mm results.
- permanent magnets 1 For the manufacture of permanent magnets 1 is generally first a rare earth alloy melted and then pulverized. Pressed parts are pressed from the powder. To set a magnetic preferred direction the pressing process in the presence of an external magnetic field. Then the pressed parts 2 are assembled and sintered at temperatures above 800 ° C. In case of Permanent magnets based on Nd-Fe-B are formed along the Top 5 and bottom 7 a liquid phase from the in the solidified state, the pressed parts 2 connects. In everyone Trap comes through during the sintering of the permanent magnets Diffusion to connect the individual parts to each other, if there was good contact between the compacts.
- a particularly good coincidence can be supported by the Achieve gravity when the stacked rod-shaped permanent magnet 1 is sintered standing.
- Permanent magnet 1 After sintering with known liquid plastics, such as B. vacuum or pressure impregnated methacrylate become. The plastic fills any pores and gaps and hardens after the permanent magnet 1 with the plastic has been soaked.
- liquid plastics such as B. vacuum or pressure impregnated methacrylate
- the method described here has a number of advantages on.
- the permanent magnet 1 Compared to rod-shaped permanent magnets that are glued of sintered parts are, the permanent magnet 1 has a much higher strength on, since the pressed parts 2 are uniform after sintering form a solid body.
- the method is inexpensive because the pressed parts 2 through the appropriately trained elevations 6 and depressions 8 can be positioned and that for a good adhesive bond required surface grinding of the top 5 and the Bottom 7 is omitted. On the contrary, it is even for a firm Sintered connection is advantageous if the top 5 and the bottom 7 are roughened.
- the pressed parts 2 are pressed individually, is sufficient for that Pressing the pressed parts 2 a tool with dimensions in the Size of the dimensions of the pressed parts 2.
- the magnetic field can be tools with little effort be kept homogeneous.
- the permanent magnets 1 in magnetic Respects much more homogeneous. You can also use this described method permanent magnet 1 with almost any Ratio of diameter to length.
- Nd-Fe-B powder becomes blanks in a magnetic field with a diameter of 22 mm and a height of 10 mm pressed using a pressure of 250 MPa. Each four blanks are stacked on top of each other to form a green compact and standing sintered at 1100 ° C in a vacuum for 1 hour. After this However, sintering was not connected to 60% of the finished sintered bodies. The rest of the sintered body could be through one Slightly separate the blow.
- the present description of the method is exemplary; in particular, the joining of the pressed parts 2 should not be limited to rod-shaped magnets.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Manufacturing Cores, Coils, And Magnets (AREA)
- Hard Magnetic Materials (AREA)
- Powder Metallurgy (AREA)
Abstract
Description
- Figur 1
- eine perspektivische Ansicht eines mit dem Verfahren gemäß der Erfindung hergestellten stabförmigen Dauermagneten;
- Figur 2
- eine Draufsicht auf ein Preßteil, das zu einem stabförmigen Dauermagneten zusammengebaut werden kann;
- Figur 3
- einen Querschnitt durch ein weiteres Preßteil; und
- Figur 4
- einen Querschnitt durch ein weiteres abgewandeltes Preßteil.
SE-Gehalt [Gew.%] | Anteil gefügter Teile nach Sintern [%] |
28,7 | 16 |
31,2 | 100 |
33,4 | 100 |
Claims (10)
- Verfahren zur Herstellung von Dauermagneten, die eine Phase von der Zusammensetzung SE2T14B enthält, wobei T wenigstens ein Element aus der Gruppe der Elemente Fe und Co ist, mit folgenden Verfahrensschritten:Herstellung eines Pulvers aus einer wenigstens eine seltene Erde (SE)enthaltenden Legierung;Pressen des Pulvers zu Pressteilen (2);Zusammenfügen der Pressteile (2) mit Hilfe von auf der Oberfläche der Pressteile (2) ausgebildeten Erhöhungen (6) und Vertiefungen (8) zu einem Grünling; undSintern des Grünlings, wobei der Seltenen-Erden-Gehalt der Dauermagnete 1 Gew.% größer als der stöchiometrische Seltenen-Erden-Gehalt der hartmagnetischen Phase von der Zusammensetzung Se2 T14 B und kleiner oder gleich 33,4 Gew.% ist und während des Sinterns eine flüssige Phase ausgebildet wird durch die die Pressteile (2) untereinander verbunden werden.
- Verfahren nach Anspruch 1,
dadurch gekennzeichnet, dass
die Breite der Fügespalten zwischen den Erhöhungen (6) und Vertiefungen (8) weniger als 0,5mm beträgt. - Verfahren nach einem der Ansprüche 1 oder 2,
dadurch gekennzeichnet, dass
die Erhöhungen (6) und Vertiefungen (8)konisch ausgebildet sind. - Verfahren nach einem der Ansprüche 1 bis 3,
dadurch gekennzeichnet, dass
die Pressteile (2) eine magnetische Vorzugseinrichtung aufweisen und dass durch die Vertiefungen (8) und Erhöhungen (6) eine gleichmäßige Ausrichtung der magnetischen Vorzugsrichtung der zum Grünling zusammengefügten Pressteile (2) gewährleistet wird. - Verfahren nach einem der Ansprüche 1 bis 4,
dadurch gekennzeichnet, dass
die Pressteile (2) mit der Hilfe von aufgerauhten Pressstempeln gefertigt werden. - Verfahren nach einem der Ansprüchel bis 5,
dadurch gekennzeichnet, dass
der Dauermagnet eine Selten-Erd-reiche Phase mit einem Gewichtsanteil von mindestens 2 Gew.% enthält. - Verfahren nach einem der Ansprüche 1 bis 6,
dadurch gekennzeichnet, dass
auf eine gemeinsame Grenzfläche der Pressteile (2) ein Lot aus einer Selten-Erd-haltigen Legierung mit einem Gewichtsanteil an Seltenen Erden > 10 Gew.% aufgebracht wird. - Verfahren nach einem der Ansprüche 1 bis 7,
dadurch gekennzeichnet, dass
die Pressteile (2) zumindest eine schwache magnetische Polarisation aufweisen. - Verfahren nach einem der Ansprüche 1 bis 8,
dadurch gekennzeichnet, dass
die aufeinandergestapelten Pressteile (2) stehend gesintert werden kann. - Verfahren nach eine der Ansprüche 1 bis 9,
dadurch gekennzeichnet, dass
der gesinterte Fügekörper mit einem Kunststoff imprägniert wird.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19962232 | 1999-12-22 | ||
DE19962232A DE19962232B4 (de) | 1999-12-22 | 1999-12-22 | Verfahren zur Herstellung stabförmiger Dauermagnete |
PCT/EP2000/012958 WO2001046969A1 (de) | 1999-12-22 | 2000-12-19 | Verfahren zur herstellung stabförmiger dauermagnete |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1240652A1 EP1240652A1 (de) | 2002-09-18 |
EP1240652B1 true EP1240652B1 (de) | 2004-03-17 |
Family
ID=7933952
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00985202A Expired - Lifetime EP1240652B1 (de) | 1999-12-22 | 2000-12-19 | Verfahren zur herstellung stabförmiger dauermagnete |
Country Status (5)
Country | Link |
---|---|
US (1) | US6926777B2 (de) |
EP (1) | EP1240652B1 (de) |
JP (1) | JP2003518331A (de) |
DE (2) | DE19962232B4 (de) |
WO (1) | WO2001046969A1 (de) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN1260868C (zh) * | 2001-09-03 | 2006-06-21 | 日立粉末冶金株式会社 | 永久磁铁型转子及其制造方法 |
TWI250536B (en) | 2003-02-27 | 2006-03-01 | Mitsubishi Electric Corp | Ring-shaped magnet and manufacturing method thereof |
US8747583B2 (en) * | 2010-06-17 | 2014-06-10 | Nissan Motor Co., Ltd. | Manufacturing device for permanent magnet disposed in rotating electrical machine and manufacturing method of the same |
Family Cites Families (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3887395A (en) * | 1974-01-07 | 1975-06-03 | Gen Electric | Cobalt-rare earth magnets comprising sintered products bonded with cobalt-rare earth bonding agents |
US3892598A (en) * | 1974-01-07 | 1975-07-01 | Gen Electric | Cobalt-rare earth magnets comprising sintered products bonded with solid cobalt-rare earth bonding agents |
US4289549A (en) * | 1978-10-31 | 1981-09-15 | Kabushiki Kaisha Suwa Seikosha | Resin bonded permanent magnet composition |
DE7836712U1 (de) * | 1978-12-12 | 1979-06-28 | Walter Hebel Gmbh & Co, 5242 Kirchen | Magnete zum anheften von anschauungsmaterial und zu organisationszwecken |
DE7903999U1 (de) * | 1979-02-14 | 1979-06-28 | Walter Hebel Gmbh & Co, 5242 Kirchen | Magnete mit kappen zum anheften von anschauungsmaterial und zu organisationszwecken usw. |
DE3047701A1 (de) * | 1980-12-18 | 1982-07-15 | Magnetfabrik Bonn Gmbh Vorm. Gewerkschaft Windhorst, 5300 Bonn | Verfahren zum herstellen von anisotropen dauermagneten und danach hergestellte rohrfoermige dauermagnete |
FR2526994B1 (fr) * | 1982-05-11 | 1987-03-06 | Draper Lab Charles S | Procede et appareillage pour produire des aimants cobalt-terre rare en anneau a orientation radiale du champ magnetique et aimant permanent ainsi obtenu |
CA1277159C (en) * | 1983-05-06 | 1990-12-04 | Setsuo Fujimura | Isotropic permanent magnets and process for producing same |
DE3789829T2 (de) * | 1986-06-06 | 1994-09-01 | Seiko Instr Inc | Seltene Erden-Eisenmagnet und Herstellungsverfahren. |
US4859410A (en) * | 1988-03-24 | 1989-08-22 | General Motors Corporation | Die-upset manufacture to produce high volume fractions of RE-Fe-B type magnetically aligned material |
US5049053A (en) * | 1988-08-18 | 1991-09-17 | Hitachi Metals, Ltd. | Metal mold for molding anisotropic permanent magnets |
SE9001409D0 (sv) * | 1990-04-20 | 1990-04-20 | Sandvik Ab | Metod foer framstaellning av haardmetallkropp foer bergborrverktyg och slitdelar |
DE4117104A1 (de) * | 1991-05-25 | 1992-11-26 | Vacuumschmelze Gmbh | Verfahren zur herstellung eines stickstoffhaltigen dauermagneten, insbesondere sm-fe-n |
US5382303A (en) * | 1992-04-13 | 1995-01-17 | Sps Technologies, Inc. | Permanent magnets and methods for their fabrication |
US5641363A (en) * | 1993-12-27 | 1997-06-24 | Tdk Corporation | Sintered magnet and method for making |
JP3132393B2 (ja) * | 1996-08-09 | 2001-02-05 | 日立金属株式会社 | R−Fe−B系ラジアル異方性焼結リング磁石の製造方法 |
DE19912470B4 (de) * | 1999-03-19 | 2005-06-02 | Vacuumschmelze Gmbh | Verbundteil und Verfahren zu dessen Herstellung |
-
1999
- 1999-12-22 DE DE19962232A patent/DE19962232B4/de not_active Expired - Fee Related
-
2000
- 2000-12-19 WO PCT/EP2000/012958 patent/WO2001046969A1/de active IP Right Grant
- 2000-12-19 JP JP2001547408A patent/JP2003518331A/ja active Pending
- 2000-12-19 DE DE50005736T patent/DE50005736D1/de not_active Expired - Fee Related
- 2000-12-19 US US10/129,559 patent/US6926777B2/en not_active Expired - Fee Related
- 2000-12-19 EP EP00985202A patent/EP1240652B1/de not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
JP2003518331A (ja) | 2003-06-03 |
US20030110617A1 (en) | 2003-06-19 |
US6926777B2 (en) | 2005-08-09 |
WO2001046969A1 (de) | 2001-06-28 |
EP1240652A1 (de) | 2002-09-18 |
DE50005736D1 (de) | 2004-04-22 |
DE19962232A1 (de) | 2001-07-12 |
DE19962232B4 (de) | 2006-05-04 |
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