CN102528030A - Production method of high-performance axial ring sintered neodymium-iron-boron permanent magnet and mould thereof - Google Patents
Production method of high-performance axial ring sintered neodymium-iron-boron permanent magnet and mould thereof Download PDFInfo
- Publication number
- CN102528030A CN102528030A CN 201010599282 CN201010599282A CN102528030A CN 102528030 A CN102528030 A CN 102528030A CN 201010599282 CN201010599282 CN 201010599282 CN 201010599282 A CN201010599282 A CN 201010599282A CN 102528030 A CN102528030 A CN 102528030A
- Authority
- CN
- China
- Prior art keywords
- rubber mold
- production method
- post core
- mould
- permanent magnet
- 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.)
- Pending
Links
Images
Abstract
The invention provides a production method of high-performance axial ring sintered neodymium-iron-boron permanent magnet and a mould thereof. The production method includes steps of blending, filling, packaging, orienting, forming and sintering. Compared with the prior art, the production method has the advantages that materials are saved and production cost is reduced since rings are produced directly by the aid of rubber moulds, production performance is improved by means of pulse magnetization orientation, and production of the permanent magnet can be realized manually or automatically flexibly.
Description
Technical field
The present invention relates to the axial ring-type sintered Nd-Fe-B permanent magnet of a kind of high-performance production method, and a kind of rubber mold that is used for the axial ring-type sintered Nd-Fe-B permanent magnet of production high-performance is provided.
Technical background
Produce axial ring-type sintered Nd-Fe-B permanent magnet at present and mainly contain three kinds of modes: traditional vertical die pressing is to adopt the production cylinder to add the processing technology of drawing endoporus; This mode loss is big; Stock utilization causes the serious waste of material between 62%-64%, production cost is high; The second way is that the mode that adopts hand to remove mould is produced, and this mode production efficiency is low, is approximately 75% of traditional pressing mode; The third mode is to adopt the mode of parallel compacting, and the magnet performance that this mode is produced is lower than the magnet performance of the conventional mode of production, and remanent magnetism approximately hangs down 5%.
Summary of the invention
The objective of the invention is to provide to the existing axial ring-type permanent magnet mode of production method of the axial ring-type sintered Nd-Fe-B permanent magnet of a kind of production high-performance, said method comprises the steps:
(1) be that 0.05-1.0g/kg mixes in batch can formula batch mixer with the weight ratio with lubricant and magnetic, obtain the magnetic mixture, said magnetic is any sintered NdFeB product;
(2) dress powder in the atmosphere of inert gas, is encased in a said rubber mold on the platform that vibrator is housed according to the dress powder density that configures with said magnetic mixture, and after having adorned said magnetic mixture, the lid of said rubber mold is buckled;
(3) encapsulation in the atmosphere of inert gas, is sealed the rubber mold that said magnetic mixture is housed with vacuum packaging machine;
(4) orientation is carried out disposable orientation with the pulse magnet charger to one or more moulds with the rubber mold that has encapsulated;
(5) moulding, the rubber mold that orientation is finished places isostatic pressing machine to wait the static pressure operation; With
(6) sintering is in the atmosphere of inert gas, with carrying out sintering in the taking-up of the magnet in the rubber mold and pack into vacuum sintering furnace or the inert gas filled sintering furnace.
Wherein, the magnet charger coil size of pulse magnet charger is relevant with mould diameter and length.Evenly magnetize interval (operation interval) in that the magnet charger coil allows placed mould as much as possible: if the ratio of coil diameter and mould diameter greater than 1 less than 2; And the operation interval length of coil and the ratio of die length greater than 1 less than 2; Then can place a mould, other situations can be placed a plurality of moulds.
Preferably, in step (1), said lubricant is stearate or paraffin, and said stearate is a zinc stearate.
Preferably, in step (2), the dress powder density is 2.5-3.5g/cm
3, here, the dress powder density is represented magnetic consumption and rubber mold magnitude proportion.In step (2), the shake table in the dress powder process keeps vibration, buckle the lid of said rubber mold after, be inverted on the shake table and vibrate.Preferably, the mould that magnetic is housed is vibrated 60s on shake table, buckle the end that just to buckle die cap behind the die cap and contact with shake table and vibrate 20s.
Preferably, the orientation field intensity peak value in the step (4) is 6.1T.
Preferably, the pressure >=150MPa that waits static pressure in the step (5).
Preferably, the sintering temperature in the step (6) is 1060 ℃, temperature retention time 5 hours.
Preferably, said inert gas is 99.99% above high-purity nitrogen.
According to a further aspect in the invention, the present invention also provides a kind of rubber mold that is used for the axial ring-type sintered Nd-Fe-B permanent magnet of production high-performance, and said rubber mold comprises: a mould tube, two die caps and a post core; Said post core is arranged at the internal layer of said rubber mold, and said mould tube is arranged at the skin of said rubber mold, and said post core is coaxial with said mould tube, and said die cap vertically is arranged at the two ends of said post core and said mould tube; The shape of said post core is complementary with the shape and the size of size with said mould tube.
Preferably, if greatly then the post core diameter is just big for the internal diameter of ring, vice versa.
Preferably, the hardness of said mould tube is Shao Shi 30-35 degree; The hardness of said die cap is Shao Shi 35-40 degree, and said post core is processed by pure iron, copper, stainless steel, pottery or bakelite.
Method compared with prior art of the present invention has following advantage: 1, the present invention adopts the special (purpose) rubber mould, the Direct Production annulus, and economical with materials reduces production costs; 2, the mode through adopting pulse to magnetize and be orientated has improved properties of product, can adopt manual or automatic mode to produce neatly.
Description of drawings
Fig. 1 is the mould tube of rubber mold of the present invention;
Fig. 2 is the die cap of rubber mold of the present invention;
Fig. 3 is the post core of rubber mold of the present invention;
Fig. 4 is the combination of the die cap and the post core of rubber mold of the present invention;
Fig. 5 is the combination of mould tube, die cap and the post core of rubber mold of the present invention.
The specific embodiment
In order further to understand structure of the present invention, characteristic and other purposes, combine appended preferred embodiment to specify as follows at present, illustrated preferred embodiment only is used to technical scheme of the present invention is described, and non-limiting the present invention.
Embodiment 1: the rubber mold of preparation
Shown in Fig. 1～5, this rubber mold comprises a mould tube, two die caps and a post core.Said post core is arranged at the internal layer of said rubber mold; Said mould tube is arranged at the skin of said rubber mold; And said post core is coaxial with said mould tube; Said die cap vertically is arranged at the two ends of said post core and said mould tube, and the shape of said post core is complementary with the shape and the size of size with said mould tube.The hardness of wherein said mould tube is Shao Shi 30-35 degree; The hardness of said die cap is Shao Shi 35-40 degree, and said post core is processed by pure iron, copper, stainless steel, pottery or bakelite.
Mould specification is Φ 55* Φ 22.5*45 (mm) in the present embodiment.Mould tube specification: external diameter Φ 63mm, internal diameter Φ 55mm highly is 45mm, and hardness is Shao Shi 31 degree, and material is a polyurethane rubber; The die cap specification: base diameter is Φ 63mm, highly is 3mm, and the boss diameter is Φ 55mm, highly is 5mm, and hardness is Shao Shi 36 degree, and material is a polyurethane rubber; Post core specification: base diameter is Φ 25mm, highly is 1mm, and the boss diameter is Φ 21.5, highly is 50mm, and material is austenitic stainless steel (304 type).
Embodiment 2: the production method of the axial ring-type sintered Nd-Fe-B permanent magnet of high-performance
The magnetic proportioning is (PrNd) 29.3 in the present embodiment, and Fe 63.1, and Co 3.0, and Cu 0.1, Al0.3, Dy3.2, B1.0 (wt%).The magnet specification is Φ 40* Φ 23*31 (mm) in the present embodiment, and 31 is magnetizing direction.
1, batch mixing 1 hour obtains magnetic mixture with weight ratio for mixing in batch can formula batch mixer in the ratio of 0.3g/kg with zinc stearate and above-mentioned magnetic.
2, dress powder in the glove box that is filled with 99.99% above high-purity nitrogen, is 3.1g/cm according to the dress powder density
3230g magnetic mixture is encased in rubber mold among the embodiment 1 on the platform that vibrator is housed; Shake table keeps vibration in dress powder process; After having adorned said magnetic mixture, the lid of said rubber mold is buckled, be inverted on the shake table and vibrate, particularly; The mould that magnetic is housed is vibrated 60s on shake table, buckle the end that just to buckle die cap behind the die cap and contact with shake table and vibrate 20s.。
3, encapsulation, in the glove box that is filled with 99.99% above high-purity nitrogen, it is packaged with vacuum packaging machine that the rubber mold that magnetic is housed is put the special plastic bag.
4, orientation is put into the pulse magnet charger with packaged rubber mold and is orientated.This orientation field intensity peak value is 6.1T.
5, moulding, the rubber mold that orientation is finished places isostatic pressing machine to wait the static pressure operation, waits the pressure >=150MPa of static pressure.
6, sintering, in the glove box that is filled with 99.99% above high-purity nitrogen, with carrying out sintering in the taking-up of the magnet in the rubber mold and the vacuum sintering furnace of packing into, sintering temperature is 1060 ℃, temperature retention time 5 hours.
Finally obtain the performance of sintered magnet and the magnet performance contrast of producing, see also table 1 with vertical pressing mode.
Table 1
| Production technology | Br(KGs) | Hcj(KOe) | ?(BH)max(MGOe) |
| Production technology of the present invention | 13.0 | 20.5 | ?41.0 |
| Common process | 12.5 | 20.8 | ?39.1 |
Can be found out by table 1: production technology of the present invention has increased substantially the remanent magnetism and the magnetic energy product of magnet, and properties of product have remarkable lifting; Because of taking the mode of Direct Production annulus,, reduced production cost again so practiced thrift material.
Embodiment 3: the dress powder density is to Effect on Performance
The magnetic proportioning is (PrNd) 29.9 in the present embodiment, and Fe 67.5, and Co 0.9, and Cu 0.1, Al0.2, Dy0.4, B1.0 (wt%).
The rubber mold specification is identical with embodiment 1.
The dress powder density is respectively 2.5g/cm
3, 3.1g/cm
3, 3.5g/cm
3
It is following to utilize the said method of this patent to obtain the result, sees also table 2.
Table 2
| Dress powder density (g/cm 3) | Br(KGs) | Hcj(KOe) | (BH)max(MGOe) |
| 2.5 | 14.18 | 15.31 | 49.2 |
| 3.1 | 14.10 | 15.70 | 48.6 |
| 3.5 | 14.02 | 15.74 | 48.3 |
| Common process | 13.88 | 15.12 | 47.3 |
Can be found out by table 2: the properties of product through the axial ring-type sintered Nd-Fe-B permanent magnet that method of the present invention obtained under above-mentioned three kinds of dress powder density conditions are all high than the properties of product that common process is produced.And the dress powder density is low, and performance is high; The dress powder density is high, and performance is lower slightly.
Embodiment 4: lubricant and magnetic weight ratio are to Effect on Performance
The magnetic proportioning is (PrNd) 31.7 in the present embodiment, and Fe 66.4, and Co 0.35, and Cu 0.1, and Al 0.35, Dy0.1, B1.0 (wt%).
Lubricant and magnetic weight ratio are respectively 0.01g/kg, 1.0g/kg.
Lubricant is a paraffin.
It is following to utilize method of the present invention to obtain the result, sees also table 3
Table 3
| Lubricant and magnetic weight ratio (g/kg) | Br(KGs) | Hcj(KOe) | (BH)max(MGOe) |
| 0.01 | 13.35 | 14.58 | 43.8 |
| 1.0 | 13.43 | 14.20 | 44.2 |
| Do not add lubricant | 13.23 | 15.04 | 42.7 |
Can be found out by table 3: after adding lubricant, the properties of product through the axial ring-type sintered Nd-Fe-B permanent magnet that method of the present invention obtained get a promotion.
This method is applicable to the production of any sintered NdFeB product, and every kind of sintered NdFeB properties of product are all had castering action.
What need statement is that the foregoing invention content and the specific embodiment are intended to prove the practical application of technical scheme provided by the present invention, should not be construed as the qualification to protection domain of the present invention.Those skilled in the art are in spirit of the present invention and principle, when doing various modifications, being equal to replacement or improvement.Protection scope of the present invention is as the criterion with appended claims.
Claims (9)
1. a rubber mold that is used for the axial ring-type sintered Nd-Fe-B permanent magnet of production high-performance is characterized in that, said rubber mold comprises: a mould tube, two die caps and a post core; Said post core is arranged at the internal layer of said rubber mold, and said mould tube is arranged at the skin of said rubber mold, and said post core is coaxial with said mould tube, and said die cap vertically is arranged at the two ends of said post core and said mould tube; The shape of said post core is complementary with the shape and the size of size with said mould tube.
2. rubber mold as claimed in claim 1 is characterized in that, the hardness of said mould tube is Shao Shi 30-35 degree; The hardness of said die cap is Shao Shi 35-40 degree, and said post core is processed by pure iron, copper, stainless steel, pottery or bakelite.
3. the method for an employing axial ring-type sintered Nd-Fe-B permanent magnet of rubber mold production high-performance according to claim 1 or claim 2, said method comprises the steps:
(1) batch mixing is that 0.05-1.0g/kg mixes in batch can formula batch mixer with the weight ratio with lubricant and magnetic, obtains the magnetic mixture, and said magnetic is any sintered NdFeB product;
(2) dress powder in the atmosphere of inert gas, is encased in a said rubber mold on the platform that vibrator is housed according to the dress powder density that configures with said magnetic mixture, and after having adorned said magnetic mixture, the lid of said rubber mold is buckled;
(3) encapsulation in the atmosphere of inert gas, is sealed the rubber mold that said magnetic mixture is housed with vacuum packaging machine;
(4) orientation is carried out disposable orientation with the pulse magnet charger to one or more moulds with the rubber mold that has encapsulated;
(5) moulding, the rubber mold that orientation is finished places isostatic pressing machine to wait the static pressure operation; With
(6) sintering is in the atmosphere of inert gas, with carrying out sintering in the taking-up of the magnet in the rubber mold and pack into vacuum sintering furnace or the inert gas filled sintering furnace.
4. in step (1), said lubricant is stearate or paraffin, and said stearate is a zinc stearate.
5. production method as claimed in claim 3 is characterized in that, in step (2), the dress powder density is 2.5-3.5g/cm
3
6. production method as claimed in claim 3 is characterized in that, the orientation field intensity peak value in the step (4) is 6.1T.
7. production method as claimed in claim 3 is characterized in that, the pressure >=150MPa that waits static pressure in the step (5).
8. production method as claimed in claim 3 is characterized in that, the sintering temperature in the step (6) is 1060 ℃, temperature retention time 5 hours.
9. production method as claimed in claim 3 is characterized in that, said inert gas is 99.99% above high-purity nitrogen.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010599282 CN102528030A (en) | 2010-12-21 | 2010-12-21 | Production method of high-performance axial ring sintered neodymium-iron-boron permanent magnet and mould thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010599282 CN102528030A (en) | 2010-12-21 | 2010-12-21 | Production method of high-performance axial ring sintered neodymium-iron-boron permanent magnet and mould thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102528030A true CN102528030A (en) | 2012-07-04 |
Family
ID=46336746
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201010599282 Pending CN102528030A (en) | 2010-12-21 | 2010-12-21 | Production method of high-performance axial ring sintered neodymium-iron-boron permanent magnet and mould thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102528030A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110504097A (en) * | 2019-08-29 | 2019-11-26 | 江西开源自动化设备有限公司 | A kind of pressing under magnetic field method improving sintered magnet remanent magnetism |
| CN111702432A (en) * | 2020-04-28 | 2020-09-25 | 武汉理工大学 | Method for quickly manufacturing mold cavity part |
| CN112659631A (en) * | 2020-11-26 | 2021-04-16 | 深圳市众诚达应用材料科技有限公司 | Cold isostatic pressing forming method |
| CN115229942A (en) * | 2022-09-25 | 2022-10-25 | 常州市武进红东电子有限公司 | Pneumatic pressing device and method for preparing small-size sintered neodymium-iron-boron multi-pole magnetic ring |
-
2010
- 2010-12-21 CN CN 201010599282 patent/CN102528030A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110504097A (en) * | 2019-08-29 | 2019-11-26 | 江西开源自动化设备有限公司 | A kind of pressing under magnetic field method improving sintered magnet remanent magnetism |
| CN111702432A (en) * | 2020-04-28 | 2020-09-25 | 武汉理工大学 | Method for quickly manufacturing mold cavity part |
| CN111702432B (en) * | 2020-04-28 | 2022-01-04 | 武汉理工大学 | Method for quickly manufacturing mold cavity part |
| CN112659631A (en) * | 2020-11-26 | 2021-04-16 | 深圳市众诚达应用材料科技有限公司 | Cold isostatic pressing forming method |
| CN115229942A (en) * | 2022-09-25 | 2022-10-25 | 常州市武进红东电子有限公司 | Pneumatic pressing device and method for preparing small-size sintered neodymium-iron-boron multi-pole magnetic ring |
| CN115229942B (en) * | 2022-09-25 | 2022-11-29 | 常州市武进红东电子有限公司 | Pneumatic pressing device and method for preparing small-size sintered neodymium-iron-boron multi-pole magnetic ring |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100407347C (en) | Preparation method of radiation orientation integral permanent magnetic ring | |
| JP5815655B2 (en) | R-T-B-M-C sintered magnet manufacturing method and manufacturing apparatus thereof | |
| US8128757B2 (en) | Method of manufacturing oriented body, molded body and sintered body as well as method of manufacturing permanent magnet | |
| CN101770862B (en) | Method for preparing radiation oriental magnetic ring and radiation multipolar magnetic ring | |
| CN102528030A (en) | Production method of high-performance axial ring sintered neodymium-iron-boron permanent magnet and mould thereof | |
| CN1934663A (en) | Methods of producing radial anisotropic cylinder sintered magnet and permanent magnet motor-use cylinder multi-pole magnet | |
| US11881351B2 (en) | Preparation method of ring-shaped sintered Nd—Fe—B magnet and its moulding die | |
| CN102360914B (en) | Method for manufacturing annular magnet with radial magnetic orientation | |
| CN103782352B (en) | The manufacture method and bonded permanent magnet of R-T-B classes rare earth magnet powder, R-T-B class rare earth magnet powders | |
| CN104599803A (en) | NdFeB permanent magnet prepared by high-hydrogen content powder and preparation technology thereof | |
| CN105359228B (en) | Produce the method and permanent magnet and the electrically powered machine with such permanent magnet of permanent magnet | |
| CN102039630A (en) | Compression moulding method for annular rare-earth magnet | |
| CN103996478A (en) | Method for manufacturing neodymium iron boron magnet | |
| CN208290142U (en) | The radial 12 pole magnet ring forming moulds tool of permanent-magnet ferrite | |
| CN107200569A (en) | A kind of high-performance dry-pressing permanent-magnet ferrite rotor and its manufacture method | |
| CN100413572C (en) | Apparatus for producing granulated powder of rare earth alloy | |
| CN100409376C (en) | Shaping method of nano-crystal neodymium iron boron magnetic body and apparatus thereof | |
| CN105206416A (en) | Orientation press method of neodymium-iron-boron magnet | |
| CN1271650C (en) | Manufacturing method for permanent magnet and pressing device | |
| CN202824654U (en) | Sintered Nd-Fe-B pressing mold | |
| CN101879594B (en) | Warm compaction method and die for preparing integrated permanent magnetic ring with radial structure | |
| CN104741613B (en) | Radially oriented ring of neodymium iron boron and preparation method thereof | |
| JP4240988B2 (en) | Rare earth alloy granulated powder manufacturing method, rare earth alloy granulated powder manufacturing apparatus, and rare earth alloy sintered body manufacturing method | |
| CN208298649U (en) | The radial 12 pole magnet ring magnetizing clamps of permanent-magnet ferrite | |
| JPH11195548A (en) | Production of nd-fe-b magnet |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20120704 |