CN106653269A - Technological method and tool for manufacturing high-consistency sintered neodymium-iron-boron permanent magnet - Google Patents
Technological method and tool for manufacturing high-consistency sintered neodymium-iron-boron permanent magnet Download PDFInfo
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- CN106653269A CN106653269A CN201611180961.0A CN201611180961A CN106653269A CN 106653269 A CN106653269 A CN 106653269A CN 201611180961 A CN201611180961 A CN 201611180961A CN 106653269 A CN106653269 A CN 106653269A
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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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- 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
- H01F1/061—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 with a protective layer
-
- 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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- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Powder Metallurgy (AREA)
- Hard Magnetic Materials (AREA)
- Manufacturing Cores, Coils, And Magnets (AREA)
Abstract
The invention relates to a manufacturing method for a sintered neodymium-iron-boron permanent magnet material, specifically to a technological method and a tool for manufacturing a high-consistency sintered neodymium-iron-boron permanent magnet, and solves the problem of poor consistency of the permanent magnet manufactured by the prior art. According to the technological method, a protection layer covering process is added between a magnetic field oriented moulding process and a de-molding process, wherein the protection layer is a powdered mixture; and the powdered mixture is prepared from 70-80% of lanthanum powder, 20-30% of iron powder and number 120 solvent gasoline through the steps of stirring and mixing uniformly in an exhausted and sealed tank. By adoption of the manufacturing method, the problems of flux weakening, poor square degree and the like caused by degradation of the upper end plane of the magnet caused by a conventional production method are effectively solved, and the neodymium-iron-boron permanent magnet with excellent consistency is obtained finally.
Description
Technical field
The present invention relates to the manufacture method of sintered Nd-Fe-B permanent magnetic material, specially makes high concordance sintered NdFeB forever
The process and its frock of magnet.
Background technology
Third generation rare earth permanent magnet neodymium iron boron（Chemical name Nd-Fe-B）It is referred to as " magnetic king ", its application is boundless.By
In with high energy product and high-coercive force, equal volume can have the magnetic energy than other permanent magnet materials 60-100 times, so in intelligence
The fields such as energy mobile phone, flat concussion motor, earphone horn, digital focusing motor, micro machine, wind power motor, elevator traction machine obtain
To extensively application.
It is by as follows successively operation is realized to make the process generally adopted at present during Nd-Fe-B permanent magnet materials：Match somebody with somebody
Side draws up, raw material claims to match somebody with somebody, vacuum melting rapid hardening slab, hydrogen be broken for coarse powder, airflow milling be made as fine powder, fine powder stirring and evenly mixing,
Claim die-filling powder, magnetic field orientating and be shaped to swing in material after cube or cylinder, the demoulding, vacuum packaging, isostatic pressed, dress of unpacking
Box, enter stove vacuum-sintering and be tempered, grind processing, be cut into finished product sheet.
The magnetic property of Nd-Fe-B permanent magnet materials can be reduced after increasing due to the content of oxygen, carbon, nitrogen, therefore is produced more than
In link, be by the way of vacuum equipment and inert gas shielding.Although the existing mode of production employs vacuum equipment and lazy
The mode of property gas shield producing, but, because the made fine powder of airflow milling in process of production belongs to 1.6-8 m magnitudes,
This fine powder in follow-up mixed powder, during claiming powder, die mould, dress of unpacking, pendulum box, it is inevitable or to adsorb a certain amount of oxygen,
Carbon, nitrogen.These absorption material during vacuum-sintering as the rising of temperature will be discharged, but what these were discharged
The gases such as oxygen, nitrogen, carbon monoxide, carbon dioxide timely can not be extracted by vacuum pump and are discharged to outside vacuum drying oven, have one
The individual stage is trapped in vacuum drying oven, sintering atmosphere deterioration in this stage, so as to affect the performance of permanent magnet material.Its effect characteristics
The upper end face part deterioration of magnet is so that, causes to there are problems that in actual production following two：
1st, actually only needing to cut away the termination of 0.5～0.75mm in follow-up cutting processing can just accomplish possess guarantee finished product
The datum plane of machining accuracy, but because the upper surface of part magnet deteriorates, deterioration part magnetic property is very low（That is weak magnetic）, and be
Avoid the appearance of weak magnetic product, needs take the mode for removing 1～3mm of termination, this just certainly will cause the waste of raw material and into
Originally increase；
2nd, magnet has an important performance indexes --- squareness（HK/Hcj）, squareness is the demagnetization for affecting magnet in high temperature
The important parameter of rate, can produce temperature rise when working due to motor, thus in each machine field be all be not intended to it is square
The low Magnet product of degree.
Because the upper surface of magnet deteriorates, the squareness on magnet top will be low, and certain magnet is not affected by deterioration atmosphere
The squareness of part be normal.The squareness detection of magnet is that the standard specimen that single piece magnets are processed as with D10mm × 10mm enters
Row test, and standard specimen thickness 10mm is much larger than the depth of deterioration part, then the measured squareness of standard specimen test is deterioration
Part and the meansigma methodss for not receiving deterioration part, just show standard specimen entirety squareness low.But it is well recognized that this is upper end
Face deterioration is caused, it is impossible to all destroyed one integral piece or by the gross.It is how deep that problem is that the low deterioration part of this squareness specifically reaches
To be difficult detection, and with batch in different part magnets its depth that has influence on is deteriorated per part is also inconsistent, anti-mistake
For follow-up cutting when be again that every magnet is unified to remove the mode of same depth, therefore the existing this mode of production is to keep away
It is unavoidable still with the presence of the low Magnet finished product of squareness, simply probability size, this is potential for the client of downstream
Probabilistic serious risk.
The content of the invention
The problem above that the present invention exists for solution prior art, there is provided one kind makes high conforming sintered NdFeB forever
The process of magnet, is protected by increasing a new operation-- covering between magnetic field orientating molding procedure and stripping process
Sheath operation, realizes adding the ability of kicker magnet upper surface resist degradation to the protection of magnet upper surface during follow-up sintering,
Final acquisition has excellent conforming sintered Nd-Fe-B permanent magnet.
The present invention solves above-mentioned technical problem and adopts the following technical scheme that：Make high concordance sintered Nd-Fe-B permanent magnet
Process, including operation successively as follows：Formula is drawn up, raw material claims to match somebody with somebody, vacuum melting rapid hardening slab, hydrogen are broken for slightly
Powder, airflow milling are made as fine powder, fine powder stirring and evenly mixing, claim that powder is die-filling, magnetic field orientating molding, the demoulding, vacuum packaging, isostatic pressed, tear open
Magazine is swung in after packaging, enter stove vacuum-sintering and be tempered, ground processing, be cut into finished product sheet；In magnetic field orientating molding procedure and de-
Increase protective mulch operation between die process, i.e., after magnetic field orientating molding, the first not demoulding, in the magnetic material table in die cavity
Layer protective layer is covered in face, then the demoulding and carries out subsequent handling again, simply swings in magazine operation after dress of unpacking and covers magnetic material
The end face for matcoveredn is put collectively as upper surface, cuts off protective layer finished product sheet operation is cut into；Described
Protective layer be a kind of powder mixture, the powder mixture be by 70%～80% lanthanum powder, 20%～30% iron powder and
No. 120 industrial napthas, form being uniformly mixed in the closed tank of emptying, wherein the granularity of lanthanum powder and iron powder be 40～
70 m, purity reaches more than 99%, and the consumption of No. 120 industrial napthas is the 1.5 ‰ of lanthanum powder and iron powder weight sum；The powder
The consumption of shape mixture is the 1%-1.5% of the magnet weight of capped protection.This consumption be according to detection in sintering process institute
The oxygen, nitrogen, carbon monoxide, the carbon dioxide that are trapped in stove causes respectively increased oxygen, nitrogen, carbon in magnet upper-end part of driving
Content, accordingly carries out calculating the powder mixture weight absorbed required for above gas, and with reference to obtained from lot of experiments.
The consumption of No. 120 industrial napthas is both to have ensured that final powder mixture had a suitable viscosity so as to reliably covered
In magnet upper surface, be also unlikely to because excessive use is impacted to magnet performance.
Because the present invention is when sintered Nd-Fe-B permanent magnet is made, in molding link to magnet upper surface by covering
Protective layer is protected, and in follow-up sintering process, although the gas for discharging still suffer from retention problems, but due to protecting
Lanthanoid metal in sheath chemical property compared with neodymium iron boron material is more active, wherein the oxygen being detained and nitrogen be arranged in
The lanthanoid metal of upper surface reacts first and absorbs；The carbon monoxide and carbon dioxide being wherein detained is disposed in first
The high-purity iron powder of end face absorbs, therefore these gases being detained will not again encroach on the part magnetic that substantive material is neodymium iron boron
The upper surface of body；Simultaneously No. 120 industrial napthas in powder mixture are also released in sintering process as in-furnace temperature is raised
Bleed off, do not affect the performance of magnet.Therefore, present invention efficiently solves the magnet upper surface that conventional production methods are caused deteriorates
And caused weak magnetic, squareness be the problems such as be deteriorated, final acquisition has excellent conforming Nd-Fe-B permanent magnet.
For the frock that protective layer is covered on the magnetic material surface that above-mentioned process is now currently located in fact in die cavity, by cover mold and pressure
Block is constituted, and, with not magnetic conduction heavy-gauge sheeting as base material, sheet metal thickness is according to the body needed for the powder mixture weight to be arranged for cover mold
Product is calculated and designed, and being not less than should need height, is provided with the die orifice consistent with mould cavity shape on cover mold, and four
There is the shirt rim that downward bending is formed week, die orifice alignment mould inner chamber when making cover mold be placed on mould top surface；The briquetting
Cross sectional shape it is identical with die orifice shape.When using, powder mixture is put into into die orifice, then with briquetting pressing (pressing
When and strict pressing force need not be specified because the isostatic pressed link in subsequent process flow will necessarily make powder-mixed
Thing is effectively combined closely with molding neodymium iron boron product), make powder mixture in combination with the magnet upper surface in mould, i.e.,
Complete protective mulch.Further, the lower surface of the briquetting（Compaction plane）It is provided with mark convex epirelief so that in pressing,
Formed in magnet upper surface and identified, magnet enters the end face identified with vestige collectively as upper surface when magazine is subsequently swung in
Row put, fed to boiler vacuum-sintering, tempering.Being equipped with mark convex epirelief can greatly facilitate subsequent operation.
The characteristics of frock has simple and reasonable for structure, easy to use.
Description of the drawings
Fig. 1 is the structural representation of the frock for covering protective layer of the present invention（By taking cube magnet as an example）；
Fig. 2 is the top view of cover mold in Fig. 1；
Fig. 3 is the squareness of embodiment 1 and its Data Comparison broken line graph；
Fig. 4 is the table magnetic correction data broken line graph of embodiment 1；
Fig. 5 is the squareness of embodiment 2 and its Data Comparison broken line graph；
Fig. 6 is the table magnetic correction data broken line graph of embodiment 2.
In figure：1- cover molds, 2- briquettings, 3- die orifices, 4- shirt rims.
Specific embodiment
The process of high concordance sintered Nd-Fe-B permanent magnet is made, including operation successively as follows：Formula is drawn up, former material
Material title is matched somebody with somebody, vacuum melting rapid hardening slab, hydrogen are broken for coarse powder, airflow milling and are made as fine powder, fine powder stirring and evenly mixing, claim that powder is die-filling, magnetic
Magazine is swung in after field oriented moulding, the demoulding, vacuum packaging, isostatic pressed, dress of unpacking, is entered stove vacuum-sintering and is tempered, grind processing, cut
It is segmented into finished product sheet；Between magnetic field orientating molding procedure and stripping process increase protective mulch operation, i.e., magnetic field orientating into
After type, the first not demoulding covers layer protective layer on the magnetic material surface in die cavity, then the demoulding and carries out subsequent handling again,
Simply swing in magazine operation after dress of unpacking to be put the end face that magnetic material covers matcoveredn collectively as upper surface, cutting
It is segmented into finished product sheet operation to cut off protective layer；Described protective layer be a kind of powder mixture, the powder mixture be by
70%～80%（Such as, 70%, 75%, 80%）Lanthanum powder, 20%～30%（Such as, 30%, 25%, 20%）Iron powder and No. 120 solvent vapour
Oil, forms being uniformly mixed in the closed tank of emptying, and wherein the granularity of lanthanum powder and iron powder is 40～70 m（Such as, 40
m、50µm、60µm、70µm）, purity reaches more than 99%, and the consumption of No. 120 industrial napthas is lanthanum powder and iron powder weight sum
1.5‰；The consumption of the powder mixture is the 1%-1.5% of the magnet weight of capped protection（Such as, 1%, 1.1%,
1.2%th, 1.3%, 1.4%, 1.5%）.
For the frock that protective layer is covered on the magnetic material surface that above-mentioned process is now currently located in fact in die cavity, by the He of cover mold 1
Briquetting 2 is constituted, and, with not magnetic conduction heavy-gauge sheeting as base material, sheet metal thickness is according to needed for the powder mixture weight to be arranged for cover mold
Volume is calculated and designed, and being not less than should need height, and the die orifice consistent with mould cavity shape is provided with cover mold
3, surrounding has the shirt rim 4 that downward bending is formed, die orifice alignment mould inner chamber when making cover mold be placed on mould top surface；It is described
The cross sectional shape of briquetting is identical with die orifice shape.Further, the lower surface of the briquetting（Compaction plane）It is provided with mark convex epirelief.
Embodiment 1
The neodymium iron boron fine powder of the NdFeB350/110 trades mark is prepared, the cylinder of D10.5 mm × 31.5 mm is suppressed.
A part of fine powder carries out molding, the demoulding, Vacuum Package, isostatic pressed, pendulum box using conventional known method；A part
Fine powder then carries out follow-up production according to the process of the present invention, that is, be additionally arranged and cover protective layer operation；Obviously, cover and protect
It is also to carry out in the sealing guard box for being emptied using high pure nitrogen in advance as layer operation operation corresponding with other, and case
Interior oxygen content is carried out under conditions of less than 0.3%.
The products formed that the process generally adopted according to the process of the present invention and by prior art is obtained swings in material
After box, load and be sintered in same vacuum sintering furnace, be tempered, vacuum-sintering takes prior art usual with the link of tempering
Using process.
It is each 30 to two kinds of products formed stochastic sampling in embodiment 1 as made by prior art and the inventive method, from
Upper surface intercepting is processed as the standard sample of D10mm × 10 mm and carries out dominant static magnetic property detection, to remanent magnetism Br, coercivity
Hcj, magnetic energy product (BH) max, squareness（HK/Hcj）Evaluated, the results are shown in Table 1；Therebetween squareness correction data is shown in
Accompanying drawing 3；Afterwards the cylinder products formed of two class D10.5 mm × 31.5 mm is distinguished into randomization 20, carries out cylindricalo grinding,
Upper surface is cut afterwards, every cylinder cuts away 0.5 to knife by the way of as existing cutting technique, from upper end face part～
0.75mm is so that datum level centering, then feed, every cylinder is respectively cut out 3 chip size specifications for the thin of D10mm × 1mm
Disc magnet, to the Surface field of this thin slice full inspection is carried out, and is compared data and is listed in accompanying drawing 4.
Table 1：
Embodiment 2
The neodymium iron boron fine powder of the NdFeB300/160 trades mark is prepared, the cuboid of 51 mm × 46 mm × 26 mm is suppressed.
A part of fine powder carries out molding, the demoulding, Vacuum Package, isostatic pressed, pendulum box using conventional known method；A part
Fine powder then carries out follow-up production according to the process of the present invention, that is, be additionally arranged and cover protective layer operation；
The products formed that the process generally adopted according to the process of the present invention and by prior art is obtained is swung in after magazine,
Load and be sintered in same vacuum sintering furnace, be tempered, vacuum-sintering takes prior art generally to adopt with the link of tempering
Process.
It is each 3 pieces to two kinds of products formed stochastic sampling in embodiment 2 as made by prior art and the inventive method, per block
The standard sample for being processed as D10mm × 10 mm from the four angles and middle part intercepting of upper surface carries out dominant static magnetic property
Detection, to remanent magnetism Br, coercivity H j, magnetic energy product (BH) max, squareness（HK/Hcj）Evaluation is compared, 2 are the results are shown in Table；Two
Squareness correction data between person is shown in accompanying drawing 5；The cuboid products formed of mm × 46 mm × 26 mm of two class 51 is distinguished afterwards
4 pieces of randomization, per block by the way of as existing cutting technique, 0.5～0.75mm is cut away from upper end face part to knife
So that datum level centering, then feed, every square is respectively cut out the side that dimensions is 24 mm × 22 mm × 1 mm
Piece 12, to the Surface field of this thin square piece full inspection is carried out, and is compared data and is listed in accompanying drawing 6.
Table 2：
From embodiment 1 and embodiment 2, Sintered NdFeB magnet is made using the method for the present invention, entered with same powder
Row molding, adopts to according to the rules box is put in position after products formed arrangement powder mixture before the demoulding after molding with prior art
Same sintering tempering process is completed after magnet making, and remanent magnetism, magnetic energy product, coercivity do not affect, and squareness is carried
Height, is processed as the Surface field intensity after finished product and significantly tends to consistent, eliminates weak magnetic product, achieves significant effect, obtains
Obtained excellent conforming neodymium iron boron magnetic body.And the end face that the powder mixture arranged is formed in follow-up cutting due to
The two ends of technological process upper magnet must remove the termination of 0.5～0.75mm, the powder added when this processing step is implemented
Last shape mixture is removed therewith, and the cost of the powder mixture arranged in addition is about the 1/4 of neodymium iron boron magnetic body cost, skilful
It is wonderful solve existing process presence knotty problem while there is good economy.
Claims (3)
1. a kind of process for making high concordance sintered Nd-Fe-B permanent magnet, including operation successively as follows：Formula is drawn up, original
Material claims to match somebody with somebody, vacuum melting rapid hardening slab, hydrogen be broken for coarse powder, airflow milling be made as fine powder, fine powder stirring and evenly mixing, claim powder it is die-filling,
Magnetic field orientating molding, the demoulding, vacuum packaging, isostatic pressed, unpack dress after swing in magazine, enter stove vacuum-sintering and be tempered, grind processing,
It is cut into finished product sheet；Characterized in that, increase protective mulch operation between magnetic field orientating molding procedure and stripping process, i.e.,
After magnetic field orientating molding, the first not demoulding covers layer protective layer on the magnetic material surface in die cavity, and then again the demoulding is gone forward side by side
Row subsequent handling, simply swings in magazine operation and enters the end face that magnetic material covers matcoveredn collectively as upper surface after dress of unpacking
Row is put, and cuts off protective layer finished product sheet operation is cut into；Described protective layer be a kind of powder mixture, the powder
Mixture is lanthanum powder, 20%～30% iron powder and No. 120 industrial napthas by 70%～80%, in the closed tank of emptying
It is uniformly mixed and forms, wherein the granularity of lanthanum powder and iron powder is 40～70 m, purity reaches more than 99%, No. 120 solvent vapour
The consumption of oil is the 1.5 ‰ of lanthanum powder and iron powder weight sum；The consumption of the powder mixture is the magnet weight of capped protection
The 1%-1.5% of amount.
2. the frock of protective layer is covered for the magnetic material surface that process as claimed in claim 1 is now currently located in fact in die cavity,
It is characterized in that by cover mold（1）And briquetting（2）Constitute, with not magnetic conduction heavy-gauge sheeting as base material, sheet metal thickness foundation will be arranged cover mold
Powder mixture weight needed for volume calculated and designed, being not less than should need height, be provided with cover mold with into
The consistent die orifice of pattern tool cavity shape（3）, surrounding have downward bending formed shirt rim（4）, make cover mold be placed on mould top
Die orifice alignment mould inner chamber during face；The cross sectional shape of the briquetting is identical with die orifice shape.
3. frock as claimed in claim 2, it is characterised in that the lower surface of the briquetting is provided with mark convex epirelief.
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| CN201611180961.0A CN106653269B (en) | 2016-12-20 | 2016-12-20 | Make the process and its tooling of high consistency sintered Nd-Fe-B permanent magnet |
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| CN201611180961.0A CN106653269B (en) | 2016-12-20 | 2016-12-20 | Make the process and its tooling of high consistency sintered Nd-Fe-B permanent magnet |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114023553A (en) * | 2021-11-15 | 2022-02-08 | 山西大缙华磁性材料有限公司 | Process method for manufacturing high-consistency sintered neodymium-iron-boron permanent magnet |
| CN114334417A (en) * | 2021-12-28 | 2022-04-12 | 湖南稀土新能源材料有限责任公司 | Preparation method of sintered neodymium-iron-boron magnet |
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| CN103971917A (en) * | 2014-05-10 | 2014-08-06 | 董中天 | Forming method and device of sintered Nd-Fe-B radiation magnetic ring |
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| CN114023553A (en) * | 2021-11-15 | 2022-02-08 | 山西大缙华磁性材料有限公司 | Process method for manufacturing high-consistency sintered neodymium-iron-boron permanent magnet |
| CN114334417A (en) * | 2021-12-28 | 2022-04-12 | 湖南稀土新能源材料有限责任公司 | Preparation method of sintered neodymium-iron-boron magnet |
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