CN106486280B - The newly net forming processing unit (plant) and method of a kind of anisotropy magnetic Nd-Fe-B ring - Google Patents
The newly net forming processing unit (plant) and method of a kind of anisotropy magnetic Nd-Fe-B ring Download PDFInfo
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- CN106486280B CN106486280B CN201610884533.XA CN201610884533A CN106486280B CN 106486280 B CN106486280 B CN 106486280B CN 201610884533 A CN201610884533 A CN 201610884533A CN 106486280 B CN106486280 B CN 106486280B
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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
- H01F41/0266—Moulding; Pressing
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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
- H01F1/055—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
- H01F1/0576—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 pressed, e.g. hot working
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- Power Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Manufacturing Cores, Coils, And Magnets (AREA)
- Hard Magnetic Materials (AREA)
- Powder Metallurgy (AREA)
Abstract
The invention discloses a kind of newly net forming processing unit (plant) of anisotropy magnetic Nd-Fe-B ring,Including rack,And the lower end of rack is provided with lower water cooling mandril,The upper end of the rack is provided with pressure ring Pneumatic assembly,And the upper end of rack is provided with water cooling mandril,The outer end of the lower water cooling mandril is socketed with water-cooling subbase,And the upper end of water-cooling subbase is provided with concentric mould bases bracket,It is socketed between the mould bases bracket and water-cooling subbase by mould bases pressing sleeve,And the upper end grafting of mould bases bracket is provided with mould bases,The advantages of patent of the present invention, is preparation process only by being hot pressed into magnetic pole,Forward extrusion is into cup-shaped magnet twice molding procedure,And magnet providing certain buffer brake to ensure that workpiece is smoothly molded all the time at the top of magnet during forward extrusion,So it is considerably improved the ratio of briquetting and production efficiency of magnet ring,Solid foundation is established for anisotropy magnetic Nd-Fe-B ring newly net forming technique commercial application.
Description
Technical field
The present invention relates to rare-earth permanent-magnet material technical field, is specially a kind of newly net forming of anisotropy magnetic Nd-Fe-B ring
Processing unit (plant) and method.
Background technology
High density anisotropy magnet prepared by hot pressing/thermal deformation technique, is an important branch of Rare-earth Permanent Magnet Industry.
Since hot-pressed magnets overcome the limitation of sintering magnet ring preparation process from source, the magnetic of complete high length-diameter ratio can be prepared
Ring, and have the characteristics that flow is short, promotes motor lightweight, it is a kind of newly net forming technology of preparing of great development prospect.
Obtained using the high-performance magnet ring prepared by the technology in automobile EPS motor, brushless electric machine, voice coil motor, air-conditioning ipm motor
It is more and more widely used.
Hot pressing/thermal deformation method was applied in the preparation of permanent magnet in the late 1980s, but due at that time
Level limitation, is not widely popularized, in recent years, since this method is that research anisotropy two-phase compound nano crystal permanent magnetic material is opened
The new approach warded off and cause concern again.Dresden, Germany IFW research institute D.Hinz in 2003 et al.（Near net
shape production of radially oriented NdFeB ring magnets by backward
extrusion, J. of Materials Processing Technology, 2003,135:358-365.）Open report
Prepared by the way of backward extrusion with excellent magnetic can and excellent homogeneity thin-walled anisotropy magnet ring.2014
Year, the I.Dirba et al.（Net-shape and crack-free production of Nd-Fe-B magnets by
hot deformation, J. Alloy and compounds, 2014,589:301-306.）Describe hot pressing/thermal deformation
The newly net forming technique of magnetic Nd-Fe-B ring, by applying the outer of 0-0.8Mpa during neodymium iron boron magnetic body backward extrusion at the top of magnet
Reaction pressure is added to obtain the thin-walled magnetic Nd-Fe-B ring of flawless.They are at the technical process of open report, first by neodymium iron boron
Magnetic powder is hot pressed into magnet ring, then finally removes bottom to obtain complete near-net-shape magnetic into thin-walled cup-shaped magnet by magnet ring backward extrusion
Ring.Li Wei in 2011 et al. (the thermal deformation mechanism of anisotropy hot pressing rare-earth permanent magnet and micro- magnetic structure research, Chinese engineering
Science, 2011,13 (10):Anisotropic neodymium iron boron magnetic body heat pressing process 4-12.) is reported, has inquired into the heat of hot-pressed magnets
Deformation mechanism and microstructure characteristic, and disclose the vacuum hot pressing device of its independent research.Chinese invention patent
CN103123862A discloses a kind of raising hot pressing/thermal deformation radiation orientation Nd-Fe-B permanent magnetic ring performance and its axial uniformity
Method, the rapidly quenched magnetic powder with nanocrystalline structure or HDDR magnetic powders are pressed into vacuum induction hot press using heat pressing process
Isotropic magnet, is then carried out thermal deformation and obtains anisotropy nanocrystalline magnet, be finally prepared into using backward extrusion technology
Radiation orientation permanent-magnetic clamp.The middle process that the patent passes through the addition predeformation during hot pressing and backward extrusion so that backward extrusion
Blank be anisotropic thermal deformation blank, thus achieve the purpose that to improve magnet ring magnet ring uniformity and magnetic property.In order to
The magnet ring of excellent properties is obtained, and improves production efficiency, it is necessary to solve easily to crack during magnet backward extrusion, and each portion of magnet ring
The problems such as position magnetic property is uneven.
The content of the invention
It is an object of the invention to provide the newly net forming processing unit (plant) and method of a kind of anisotropy magnetic Nd-Fe-B ring, with
Solve the problems, such as proposed in the above background technology.
To achieve the above object, the present invention provides following technical solution：
A kind of newly net forming processing unit (plant) of anisotropy magnetic Nd-Fe-B ring, including rack, and the lower end of rack is provided with
Lower water cooling mandril, the upper end of the rack is provided with pressure ring Pneumatic assembly, and the upper end of rack is provided with water cooling mandril, described
The outer end of lower water cooling mandril is socketed with water-cooling subbase, and the upper end of water-cooling subbase is provided with concentric mould bases bracket, the mould bases
It is socketed between bracket and water-cooling subbase by mould bases pressing sleeve, and the upper end grafting of mould bases bracket is provided with mould bases, the mould bases
Upper end is provided with die holder, and the upper end of die holder is provided with cavity plate by mould pressing sleeve, and the rear end of the cavity plate is connected with vacuum pump,
And the outer end of pressure ring coordinates with cavity plate sealing, the lower end of the die holder is provided with induction coil, and pressure ring is socketed with cavity plate, institute
The lower end for stating water cooling mandril is socketed with pressure ring frame, and the lower end of the pressure ring frame is connected with pressure ring by pressure ring transition sleeve, described
The upper end of pressure ring frame is hinged with pressure ring seat, and the push rod of the upper end connection pressure ring Pneumatic assembly of pressure ring seat.
Its processing method comprises the following steps：
S1：Prepare magnet：Nd-Fe-B rapidly quenched magnetic powders are fitted into hot pressing die, are heated in vacuum induction hot pressing furnace
650-750 DEG C, prepare the isotropism hot pressing neodymium iron boron magnetic body of 7.2-7.3g/cm3 density values；
S2：Place magnet：Obtained neodymium iron boron magnetic body is placed into cavity plate, upper extruding punch is moved to pressure ring to be made
Pressure ring is with cavity plate just at sealing, and pressure ring Pneumatic assembly is in packing state at this time；
S3：Pour protective gas：Whole cavity between cavity plate and pressure ring is vacuumized into middle row, when digital display vacuum measures
The vacuum obtained in cavity reaches 5.5 × 10-3During pa, intake valve applying argon gas into cavity are opened, until vacuum is shown as
0.03-0.04Mpa；
S4：Hot pressing：Medium frequency induction power supply is opened, mould and material are heated, when neodymium iron boron magnetic body reaches 700-850
DEG C when, keep the temperature 5 minutes to 20 minutes, then promote lower extruding punch that material is upward with certain extruding rate, material
Flow direction and the lower extruding punch direction of motion are on the contrary, 1.5-3.5mm gaps between upper extruding punch and lower extruding punch
In flow up, formed thin-walled cup-shaped magnet；
S5：Ejection：Stop heating until cup-shaped magnet cooled and solidified, using pressure ring Pneumatic assembly by upper extruding punch and pressure
Pulled out on circumferential direction, then drive pusher set that the neodymium iron boron magnetic body obtained is ejected cavity plate using lower extruding punch.
Compared with prior art, the beneficial effects of the invention are as follows：Compared with prior art, the present invention patent of the present invention is excellent
Point is preparation process only by being hot pressed into magnetic pole, forward extrusion into cup-shaped magnet twice molding procedure, and magnet is in forward extrusion
During provide certain buffer brake all the time to ensure that workpiece is smoothly molded at the top of magnet, be so considerably improved the shaping of magnet ring
Rate and production efficiency, solid foundation is established for anisotropy magnetic Nd-Fe-B ring newly net forming technique commercial application.
Brief description of the drawings
Fig. 1 is schematic structural view of the invention；
Fig. 2 is the partial schematic diagram of structure of the present invention；
Fig. 3 is the technological process of the present invention；
Fig. 4 is molded part pictorial diagram.
In figure：Water cooling mandril, 2 pressure ring Pneumatic assemblies, 3 pressure ring seats, 4 pressure ring framves, 5 upper ejector pins, 6 pressure ring transition sleeves, 7 on 1
Upper extruding punch, 8 pressure rings, 9 molded parts, 10 cavity plates, 11 mould pressing sleeves, 12 die holders, 13 times extruding punch, 14 induction coils, 15
Pusher set, 16 lower push rods, 17 mould bases, 18 mould bases brackets, 19 mould bases pressing sleeves, 20 water-cooling subbases, 21 times water cooling mandrils.
Embodiment
Below in conjunction with the attached drawing in the embodiment of the present invention, the technical solution in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other without making creative work
Embodiment, belongs to the scope of protection of the invention.
- 4 are please referred to Fig.1, the present invention provides a kind of the newly net forming processing unit (plant) and method of anisotropy magnetic Nd-Fe-B ring
Technical solution：
Implementation column 1
A kind of newly net forming processing unit (plant) of anisotropy magnetic Nd-Fe-B ring, it is characterised in that：Including rack 22, and rack
22 lower end is provided with lower water cooling mandril 21, and the upper end of rack 22 is provided with pressure ring Pneumatic assembly 2, and the upper end installation of rack 22
There is upper water cooling mandril 1, the outer end of lower water cooling mandril 21 is socketed with water-cooling subbase 20, and the upper end of water-cooling subbase 20 is provided with one heart
Mould bases bracket 18, be socketed between mould bases bracket 18 and water-cooling subbase 20 by mould bases pressing sleeve 19, and the upper end of mould bases bracket 18
Grafting is provided with mould bases 17, and the upper end of mould bases 17 is provided with die holder 12, and the upper end of die holder 12 is provided with by mould pressing sleeve 11
Cavity plate 10, the rear end of cavity plate 10 is connected with vacuum pump, and the outer end of pressure ring 8 coordinates with the sealing of cavity plate 10, the lower end peace of die holder 12
Equipped with induction coil 14, and pressure ring 8 is socketed with cavity plate 10, the lower end of upper water cooling mandril 1 is socketed with pressure ring frame 4, pressure ring frame 4
Lower end is connected with pressure ring 8 by pressure ring transition sleeve 6, and the upper end of pressure ring frame 4 is hinged with pressure ring seat 3, and the upper end connection of pressure ring seat 3
The push rod of pressure ring Pneumatic assembly 2.
Its preparation process comprises the following steps：
S1：Prepare magnet：Nd-Fe-B rapidly quenched magnetic powders are fitted into hot pressing die, are heated in vacuum induction hot pressing furnace
700 DEG C, the isotropism hot pressing neodymium iron boron magnetic body of 7.2g/cm3 density values is prepared, the magnet is pressed into diameter 26mm after cooling,
The magnetic pole of height 15mm；
S2：Place magnet：Obtained neodymium iron boron magnetic pole is placed into cavity plate 10, upper extruding punch 7 is moved with pressure ring 8
To making pressure ring 8 with cavity plate 10 just at sealing, pressure ring Pneumatic assembly 2 is in packing state at this time；
S3：Pour protective gas：Whole cavity between cavity plate 10 and pressure ring 8 is vacuumized into middle row, when digital display vacuum
Vacuum in cavity when reaching 5.5 × 10-3 pa is measured to obtain, intake valve applying argon gas into cavity are opened, until vacuum is shown
It is shown as 0.03Mpa；
S4：Hot pressing：Medium frequency induction power supply is opened, mould and material are heated, when neodymium iron boron magnetic body reaches 750 DEG C
When, 10 minutes are kept the temperature, then promotes lower extruding punch 13 that material is upward with certain extruding rate, the flow direction of material
With lower 13 direction of motion of extruding punch on the contrary, to upstream in 3.5mm gaps between upper extruding punch 7 and lower extruding punch 13
It is dynamic, form outside diameter 43mm, the thin-walled cup-shaped magnet of wall thickness 3.5mm, height 34mm；
S5：Ejection：Stop heating until cup-shaped magnet cooled and solidified, using pressure ring Pneumatic assembly 2 by upper 7 He of extruding punch
Pressure ring 8 pulls out upwards, then drives pusher set 15 that the neodymium iron boron magnetic body obtained is ejected cavity plate 10 using lower extruding punch 13.
Embodiment 2
A kind of newly net forming processing unit (plant) of anisotropy magnetic Nd-Fe-B ring, it is characterised in that：Including rack 22, and rack
22 lower end is provided with lower water cooling mandril 21, and the upper end of rack 22 is provided with pressure ring Pneumatic assembly 2, and the upper end installation of rack 22
There is upper water cooling mandril 1, the outer end of lower water cooling mandril 21 is socketed with water-cooling subbase 20, and the upper end of water-cooling subbase 20 is provided with one heart
Mould bases bracket 18, be socketed between mould bases bracket 18 and water-cooling subbase 20 by mould bases pressing sleeve 19, and the upper end of mould bases bracket 18
Grafting is provided with mould bases 17, and the upper end of mould bases 17 is provided with die holder 12, and the upper end of die holder 12 is provided with by mould pressing sleeve 11
Cavity plate 10, the rear end of cavity plate 10 is connected with vacuum pump, and the outer end of pressure ring 8 coordinates with the sealing of cavity plate 10, the lower end peace of die holder 12
Equipped with induction coil 14, and pressure ring 8 is socketed with cavity plate 10, the lower end of upper water cooling mandril 1 is socketed with pressure ring frame 4, pressure ring frame 4
Lower end is connected with pressure ring 8 by pressure ring transition sleeve 6, and the upper end of pressure ring frame 4 is hinged with pressure ring seat 3, and the upper end connection of pressure ring seat 3
The push rod of pressure ring Pneumatic assembly 2.
Its preparation process comprises the following steps：
S1：Prepare magnet：Nd-Fe-B rapidly quenched magnetic powders are fitted into hot pressing die, are heated in vacuum induction hot pressing furnace
650 DEG C, the isotropism hot pressing neodymium iron boron magnetic body of 7.3g/cm3 density values is prepared, the magnet is pressed into diameter 26mm after cooling,
The magnetic pole of height 15mm；
S2：Place magnet：Obtained neodymium iron boron magnetic pole is placed into cavity plate 10, upper extruding punch 7 is moved with pressure ring 8
To making pressure ring 8 with cavity plate 10 just at sealing, pressure ring Pneumatic assembly 2 is in packing state at this time；
S3：Pour protective gas：Whole cavity between cavity plate 10 and pressure ring 8 is vacuumized into middle row, when digital display vacuum
Vacuum in cavity when reaching 5.5 × 10-3 pa is measured to obtain, intake valve applying argon gas into cavity are opened, until vacuum is shown
It is shown as 0.035Mpa；
S4：Hot pressing：Medium frequency induction power supply is opened, mould and material are heated, when neodymium iron boron magnetic body reaches 720 DEG C
When, 15 minutes are kept the temperature, then promotes lower extruding punch 13 that material is upward with certain extruding rate, the flow direction of material
With lower 13 direction of motion of extruding punch on the contrary, to upstream in 3mm gaps between upper extruding punch 7 and lower extruding punch 13
It is dynamic, form outside diameter 43mm, the thin-walled cup-shaped magnet of wall thickness 3mm, height 34mm；
S5：Ejection：Stop heating until cup-shaped magnet cooled and solidified, using pressure ring Pneumatic assembly 2 by upper 7 He of extruding punch
Pressure ring 8 pulls out upwards, then drives pusher set 15 that the neodymium iron boron magnetic body obtained is ejected cavity plate 10 using lower extruding punch 13.
Compared with prior art, be the advantages of patent of the present invention preparation process only through being hot pressed into magnetic pole, forward extrusion into
Cup-shaped magnet twice molding procedure, and magnet providing certain buffer brake during forward extrusion at the top of magnet all the time to ensure
Workpiece is smoothly molded, and is so considerably improved the ratio of briquetting and production efficiency of magnet ring, be anisotropy magnetic Nd-Fe-B ring it is near eventually into
Type technique commercial application establishes solid foundation.
Although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
Understanding without departing from the principles and spirit of the present invention can carry out these embodiments a variety of changes, modification, replace
And modification, the scope of the present invention is defined by the appended.
Claims (2)
- A kind of 1. newly net forming processing unit (plant) of anisotropy magnetic Nd-Fe-B ring, it is characterised in that：Including rack（22）, and rack （22）Lower end lower water cooling mandril is installed（21）, the rack（22）Upper end pressure ring Pneumatic assembly is installed（2）, and rack （22）Upper end water cooling mandril is installed（1）, the lower water cooling mandril（21）Outer end be socketed with water-cooling subbase（20）, and water Cold base（20）Upper end be provided with concentric mould bases bracket（18）, the mould bases bracket（18）With water-cooling subbase（20）Between lead to Cross mould bases pressing sleeve（19）Socket, and mould bases bracket（18）Upper end grafting mould bases is installed（17）, the mould bases（17）Upper end Die holder is installed（12）, and die holder（12）Upper end pass through mould pressing sleeve（11）Cavity plate is installed（10）, the cavity plate（10）'s Rear end is connected with vacuum pump, and pressure ring（8）Outer end and cavity plate（10）Sealing coordinates, the die holder（12）Lower end installation thoughts Answer coil（14）, and cavity plate（10）Inside it is socketed with pressure ring（8）, the upper water cooling mandril（1）Lower end be socketed with pressure ring frame（4）, The pressure ring frame（4）Lower end pass through pressure ring transition sleeve（6）It is connected with pressure ring（8）, the pressure ring frame（4）Upper end be hinged with pressure Ring seat（3）, and pressure ring seat（3）Upper end connection pressure ring Pneumatic assembly（2）Push rod.
- 2. a kind of method of the newly net forming processing unit (plant) of anisotropy magnetic Nd-Fe-B ring using described in claim 1, it is special Sign is, comprises the following steps：S1：Prepare magnet：Nd-Fe-B rapidly quenched magnetic powders are fitted into hot pressing die, 650- is heated in vacuum induction hot pressing furnace 750 DEG C, prepare 7.2-7.3g/cm3The isotropism hot pressing neodymium iron boron magnetic body of density value；S2：Place magnet：Obtained neodymium iron boron magnetic body is placed into cavity plate（10）In, by upper extruding punch（7）With pressure ring（8）Fortune Moving makes pressure ring（8）With cavity plate（10）Just at sealing, pressure ring Pneumatic assembly at this time（2）In packing state；S3：Pour protective gas：To cavity plate（10）With pressure ring（8）Between whole cavity vacuumized into middle row, when digital display vacuum Measure vacuum in cavity reaches 5.5 × 10-3During pa, intake valve applying argon gas into cavity are opened, until vacuum is shown For 0.03-0.04Mpa；S4：Hot pressing：Medium frequency induction power supply is opened, mould and material are heated, when neodymium iron boron magnetic body reaches 700-850 DEG C When, 5 minutes to 20 minutes are kept the temperature, then promotes lower extruding punch（13）By material with certain extruding rate upward, material Flow direction and lower extruding punch（13）The direction of motion is on the contrary, from upper extruding punch（7）With lower extruding punch（13）Between 1.5-3.5mm is flowed up in gap, forms the magnet of thin-walled cup-shaped；S5：Ejection：Stop heating until cup-shaped magnet cooled and solidified, utilizes pressure ring Pneumatic assembly（2）By upper extruding punch（7）With Pressure ring（8）Pull out upwards, then utilize lower extruding punch（13）Drive pusher set（15）The neodymium iron boron magnetic body obtained is ejected Cavity plate（10）.
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| CN201610884533.XA CN106486280B (en) | 2016-10-11 | 2016-10-11 | The newly net forming processing unit (plant) and method of a kind of anisotropy magnetic Nd-Fe-B ring |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4963320A (en) * | 1989-04-14 | 1990-10-16 | Daido Tokushuko Kabushiki Kaisha | Method and apparatus for producing anisotropic rare earth magnet |
| CN101202143A (en) * | 2007-11-09 | 2008-06-18 | 钢铁研究总院 | High performance radial hot pressing magnet ring and preparation method thereof |
| CN103894607A (en) * | 2014-04-23 | 2014-07-02 | 上海交通大学 | Forming method and die of anisotropic annular magnet |
-
2016
- 2016-10-11 CN CN201610884533.XA patent/CN106486280B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4963320A (en) * | 1989-04-14 | 1990-10-16 | Daido Tokushuko Kabushiki Kaisha | Method and apparatus for producing anisotropic rare earth magnet |
| CN101202143A (en) * | 2007-11-09 | 2008-06-18 | 钢铁研究总院 | High performance radial hot pressing magnet ring and preparation method thereof |
| CN103894607A (en) * | 2014-04-23 | 2014-07-02 | 上海交通大学 | Forming method and die of anisotropic annular magnet |
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Effective date of registration: 20190423 Address after: Room 305, 46-11 Huanghai Street, Songshan New District, Jinzhou City, Liaoning Province Patentee after: Jinzhou Fushibo New Materials Technology Co., Ltd. Address before: 121013 No. 19 Science and Technology Road, Songshan New District, Jinzhou City, Liaoning Province Patentee before: BOHAI UNIVERSITY |
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