CN109500398B - Orientation forming die for bonded rare earth permanent magnet - Google Patents
Orientation forming die for bonded rare earth permanent magnet Download PDFInfo
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- CN109500398B CN109500398B CN201811629845.1A CN201811629845A CN109500398B CN 109500398 B CN109500398 B CN 109500398B CN 201811629845 A CN201811629845 A CN 201811629845A CN 109500398 B CN109500398 B CN 109500398B
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- China
- Prior art keywords
- forming plate
- forming
- flow divider
- orientation
- panel
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- 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
- B22F3/22—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip
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- 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
- H01F1/0533—Alloys characterised by their composition containing rare earth metals in a bonding agent
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/032—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials
- H01F1/04—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys
- H01F1/06—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys in the form of particles, e.g. powder
- H01F1/08—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together
- H01F1/083—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together in a bonding agent
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- 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
- H01F41/0293—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 diffusion of rare earth elements, e.g. Tb, Dy or Ho, into permanent magnets
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Manufacturing Cores, Coils, And Magnets (AREA)
Abstract
The invention discloses an orientation forming die for a bonded rare earth permanent magnet, which comprises: the device comprises a panel, a flow divider, a forming plate, a cooling shell assembly, a mold core, a core rod and oriented magnetic steel; the panel is provided with a feeding cavity; the flow divider is arranged on the panel and is communicated with the feeding cavity on the panel; the forming plate is sleeved on the flow divider, and the cooling shell component is arranged on the forming plate; the mold core is arranged in the cooling shell component; the core rod penetrates through the mold core, the forming plate is connected with the flow divider and forms an extrusion forming cavity with the flow divider and the inner wall of the mold core, and the extrusion forming cavity is communicated with the flow divider; the oriented magnetic steel is arranged in the forming plate and distributed around the extrusion forming cavity. The orientation die provided by the invention has strong orientation magnetic field and small high-temperature attenuation; the formed magnet has high performance, and can be suitable for application occasions with high performance requirements such as electric tools, vehicle-mounted motors and the like.
Description
Technical Field
The invention relates to a manufacturing technology of a bonded magnet, in particular to a forming die of a bonded magnet ring.
Background
The magnetic ring is a ring-shaped magnet; the magnetic ring is a common anti-interference element in an electronic circuit and has a good inhibition effect on high-frequency noise.
In the production process of most magnetic ring forming molds in the market at present, raw materials are extruded and molded in a cavity, and then a magnetic ring is directly ejected out through a core rod. The existing magnetic ring forming die has more problems in the actual production process, particularly, the magnetic field has large high-temperature attenuation, a longer magnetic ring cannot be processed, the performance of the formed product is not high, and the application in higher occasions cannot be met.
Disclosure of Invention
Aiming at the problems of the existing bonded magnetic ring forming die, a new bonded magnetic ring forming die is needed.
Therefore, the invention aims to provide an orientation forming die for a bonded rare earth permanent magnet, which overcomes the problems in the prior art.
In order to achieve the above object, the present invention provides an orientation forming die for bonded rare earth permanent magnets, comprising:
the panel is provided with a feeding cavity;
the flow divider is arranged on the panel and is communicated with the feeding cavity on the panel;
a forming plate sleeved on the flow divider,
a cooling housing assembly disposed on the forming plate;
a mold core disposed within the cooling housing assembly;
the core rod penetrates through the mold core, the forming plate is connected with the flow divider and forms an extrusion forming cavity with the flow divider and the inner wall of the mold core, and the extrusion forming cavity is communicated with the flow divider;
and the oriented magnetic steel is arranged in the forming plate and distributed around the extrusion forming cavity.
Further, the cooling shell assembly is formed by connecting and combining a first cooling shell and a second cooling shell.
Further, the oriented magnetic steel is arranged according to radial 8 poles.
Furthermore, the orientation magnetic steel is arranged in a Halbach array mode.
Furthermore, the periphery of the oriented magnetic steel is surrounded by a non-magnetic conductive material, and the core rod is made of a magnetic conductive material and guides magnetic lines generated by sintering the magnetic steel to penetrate through a product.
The orientation die provided by the invention has strong orientation magnetic field and small high-temperature attenuation; the formed magnet has high performance, and can be suitable for application occasions with high performance requirements such as electric tools, vehicle-mounted motors and the like.
Moreover, the orientation die provided by the invention has the advantages of compact integral structure, stable and reliable performance, capability of processing a magnet with longer length, convenience in operation and strong practicability.
Drawings
The invention is further described below in conjunction with the appended drawings and the detailed description.
FIG. 1 is a schematic view of the magnetic characteristics of a permanent magnet according to an embodiment of the present invention;
FIG. 2 is a cross-sectional view of an extrusion forming radially oriented forming die for a bonded magnet ring according to an embodiment of the present invention;
FIG. 3 is a schematic view of three different magnetization directions of oriented magnetic steels in an embodiment of the present invention;
fig. 4 is a sectional view in the direction a-a of fig. 2.
Reference numbers in the figures:
| serial number | Name of article | Number of |
| 1 | Melting of raw materials | - |
| 2 | Panel board | 1 |
| 3 | Flow divider | 1 |
| 4 | Forming board | 1 |
| 5 | Oriented magnetic steel | 16 |
| 6 | Mold insert | 1 |
| 7 | Cooling housing 1 | 1 |
| 8 | |
1 |
| 9 | Core rod | 1 |
| 10 | Permanent magnet after forming | - |
| 11 | Bolt | 6 |
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further explained below by combining the specific drawings.
The present example provides a bonded rare earth permanent magnet orientation forming die for extrusion forming of permanent magnets with annular geometric characteristics in an extrusion forming mode, and the bonded rare earth permanent magnet orientation forming die is used for extrusion forming of permanent magnets of the type and radial orientation. Meanwhile, the forming die is suitable for anisotropic bonding permanent magnet materials.
Referring to fig. 2, there is shown a schematic composition diagram of a bonded rare earth permanent magnet orientation molding die given in this example.
As can be seen from the figure, the forming die mainly comprises a panel 2, a flow divider 3, a forming plate 4, a plurality of oriented magnetic steels 5, a die core 6, a first cooling shell 7, a second cooling shell 8 and a core rod 9 which are matched with each other in composition structure.
The panel 2, the flow divider 3, the forming plate 4, the mold core 6, the first cooling shell 7, the second cooling shell 8 and the core rod 9 are matched with each other to form an extrusion forming assembly.
Specifically, the entire face plate 2 is fitted to the extruder and may be set on the extruder. The panel 2 is provided with a corresponding feeding cavity and a splitter mounting hole, and a splitter channel is arranged between the splitter mounting hole and the feeding cavity. The panel 2 having such a structure is fixed to an extrusion molding machine, and the molten material 1 can be fed into an extrusion molding die through the panel 2.
The flow divider 3 is coaxially fitted in the mounting hole of the face plate 2 by interference fit and communicates with the feed cavity through a flow dividing passage in the face plate 2, thereby allowing the molten raw material to flow through the flow divider to the forming plate 4.
The forming plate 4 is a hollow structure that fits coaxially over the outer diameter of the flow splitter 3 by an interference fit. The end face of the forming plate 4 is circumferentially provided with a magnetic steel groove for accommodating the oriented magnetic steel 5.
The first cooling housing 7 is a hollow structure that is coaxially disposed on the outer diameter of the forming plate 4.
The die core 6 is a hollow structure, is coaxially installed in a mounting hole in the first cooling housing 7 through interference fit, and is fitted with the forming plate 4.
The second cooling housing 8 is a hollow structure and is coaxially installed on the outer diameter of the mold core 6.
The core rod 9 is integrally inserted into the die core 6 and the forming plate 4 and fixed to the flow divider 3 by screw connection. The outer wall of the core rod 9 and the inner wall of the mold insert 6 and the forming plate 4 form a communicated extrusion forming cavity. One end of an extrusion forming cavity section between the forming plate 4 and the core rod 9 is communicated with the flow divider 3, and the other end of the extrusion forming cavity section between the die core 6 and the core rod 9 is communicated with the conical guide section.
The orientation magnetic steels 5 are arranged in the magnetic steel grooves on the forming plate 4 according to the magnetic characteristic requirements of the product to form an orientation structure so as to form an orientation magnetic field in the die and carry out orientation magnetization synchronously when the product is formed.
On the basis, in order to ensure the reliability of the whole mold, the panel 2, the forming plate 4, the first cooling shell 7 and the second cooling shell 8 are locked into a whole by bolts 11 in the present embodiment.
In specific implementation, in order to ensure that the strength of an oriented magnetic field formed in a die is high and the high-temperature attenuation is reduced, in the embodiment, an ultra-strong permanent magnet (sintered magnetic steel) is used for forming the oriented magnetic steel 5, and the sintered magnetic steel is saturated and magnetized before assembly, wherein the sintered magnetic steel is high-remanence (strong oriented magnetic field can be generated after magnetizing and assembling) and high-coercivity (magnetic attenuation reduction can be ensured after long-term use).
Moreover, according to the requirement of the magnetic characteristics of the product, a certain amount of oriented magnetic steel is selected for arrangement.
Taking an annular permanent magnet with the magnetic characteristic of 8-pole outer diameter orientation as an example (as shown in fig. 1), 16 pieces of oriented magnetic steel 5 with three different magnetizing directions (as shown in fig. 3) are adopted in the example to form a magnetizing structure.
On the basis, the oriented magnetic steels 5 are arranged in the magnetic steel grooves on the forming plate 4 according to a Halbach Array (Halbach Array) to form a magnetizing structure (as shown in fig. 4), so that the maximum oriented magnetic field can be generated at the product position.
The oriented magnetic steel 5 thus arranged is surrounded on all sides by the forming plate 4 and the first cooling shell 7 as well as the die core 6. Accordingly, the forming plate 4, the first cooling shell 7, and the core 6 are made of a non-magnetic material in this example, so that the outer periphery of the oriented magnetic steel 5 is surrounded by the non-magnetic material, which can effectively prevent magnetic leakage.
On the basis, the core rod 9 is further prepared by adopting a magnetic conductive material in the embodiment, and the magnetic line of force generated by sintering the magnetic steel 5 is guided to penetrate through the product 10 (namely, the formed permanent magnet) by matching the magnetic conductive core rod 9 and the oriented magnetic steel 5, as shown in fig. 4, so that the effect of fully utilizing the oriented magnetic steel is achieved.
According to the orientation forming die for the bonded rare earth permanent magnet, the orientation magnetic steel 5 set according to the scheme in the orientation forming die passes through the magnetic conducting core rod 9, a magnetizing field with the intensity of 10000Oe can be generated at a product forming part, and the product can be synchronously oriented and magnetized by a strong magnetic field during forming.
When the bonded rare earth permanent magnet orientation forming die is used for processing a bonded magnetic ring, firstly, a molten raw material 1 is fed into the die from a panel 2, flows through a flow divider 3, a forming plate 4, a core rod 9 and a die core 6 in sequence, and is cooled and formed into a long magnetic ring; when the high-temperature raw materials flow through the forming plate 4, the high-temperature raw materials are magnetized by a strong magnetic field formed by the oriented magnetic steel 5 in the forming plate 4, and the product is in a magnetic state after being cooled and formed, so that the annular permanent magnet with the magnetic characteristic of 8-pole orientation of the outer diameter is obtained.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (3)
1. An orientation molding die for bonded rare earth permanent magnets, comprising:
the panel is provided with a feeding cavity and a splitter mounting hole, and a splitting channel is arranged between the splitter mounting hole and the feeding cavity;
the flow divider is arranged on the panel, is coaxially assembled in the mounting hole of the panel through interference fit and is communicated with the feeding cavity on the panel;
the forming plate is of a hollow structure and is coaxially assembled on the outer diameter of the flow divider in an interference fit mode, and a magnetic steel groove is formed in the end face of the forming plate along the circumferential direction;
a cooling housing assembly coaxially disposed on the forming plate; the cooling shell assembly is formed by connecting and combining a first cooling shell and a second cooling shell;
the mold core is coaxially arranged in a mounting hole of a first cooling shell of the cooling shell component in an interference fit manner and is matched with the forming plate;
the core rod penetrates through the mold core and the forming plate to be connected with the flow divider, a communicated extrusion forming cavity is formed between the forming plate and the inner wall of the mold core, one end of the extrusion forming cavity section between the forming plate and the core rod is communicated with the flow divider, and the other end of the extrusion forming cavity section between the mold core and the core rod is communicated with the conical guide section;
and the oriented magnetic steel is arranged in the forming plate and distributed around the extrusion forming cavity.
2. The bonded rare earth permanent magnet orientation molding die of claim 1, wherein the orientation magnetic steel is arranged in a Halbach array mode.
3. The bonded rare earth permanent magnet orientation forming die of claim 1, wherein the periphery of the orientation magnetic steel is surrounded by a non-magnetic conductive material, the core rod is made of a magnetic conductive material, and magnetic lines of force generated by sintering the magnetic steel are guided to penetrate through a product.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811629845.1A CN109500398B (en) | 2018-12-28 | 2018-12-28 | Orientation forming die for bonded rare earth permanent magnet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811629845.1A CN109500398B (en) | 2018-12-28 | 2018-12-28 | Orientation forming die for bonded rare earth permanent magnet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109500398A CN109500398A (en) | 2019-03-22 |
| CN109500398B true CN109500398B (en) | 2021-06-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811629845.1A Active CN109500398B (en) | 2018-12-28 | 2018-12-28 | Orientation forming die for bonded rare earth permanent magnet |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109500398B (en) |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2222959Y (en) * | 1994-07-20 | 1996-03-20 | 北京矿冶研究总院 | Magnetic orientation anisotropic bonded magnet extrusion molding machine |
| JPH09289127A (en) * | 1996-04-22 | 1997-11-04 | Hitachi Metals Ltd | Manufacture of rare earth permanent magnet, and the rare earth permanent magnet |
| JP3220793B2 (en) * | 1998-10-16 | 2001-10-22 | 株式会社マグエックス | Injection molded magnet using samarium-iron-nitrogen based anisotropic particles |
| CN103903850A (en) * | 2013-12-29 | 2014-07-02 | 上海爱普生磁性器件有限公司 | Anisotropic magnet radial orienting device |
| CN103887056B (en) * | 2014-03-01 | 2017-07-04 | 潍坊德诺磁业有限公司 | The processing technology of neodymium iron boron bonded magnet |
| CN106935391A (en) * | 2015-12-30 | 2017-07-07 | 上海三环磁性材料有限公司 | A kind of radial oriented mould of anisotropic bonded magnet |
| CN107672011B (en) * | 2017-09-19 | 2023-06-20 | 杭州普门磁性器件有限公司 | Extrusion molding device and method for radial multipole magnetic ring |
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2018
- 2018-12-28 CN CN201811629845.1A patent/CN109500398B/en active Active
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| CN109500398A (en) | 2019-03-22 |
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