CN101582611B - One-step forming process for sintered NdFeB permanent magnet of motor and mould thereof - Google Patents
One-step forming process for sintered NdFeB permanent magnet of motor and mould thereof Download PDFInfo
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- CN101582611B CN101582611B CN2008100610990A CN200810061099A CN101582611B CN 101582611 B CN101582611 B CN 101582611B CN 2008100610990 A CN2008100610990 A CN 2008100610990A CN 200810061099 A CN200810061099 A CN 200810061099A CN 101582611 B CN101582611 B CN 101582611B
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Abstract
The invention discloses a one-step forming process for a sintered NdFeB permanent magnet of a motor and a mould thereof. The one-step forming process comprises the following steps of preparing raw materials, smelting, casting, pulverizing, performing magnetic orientation press molding to the raw materials into a tile magnet, sintering, performing backfire and performing surface processing to the material into a finished product. The mould comprises an upper pressing head, a lower pressing head and a cavity die body, wherein the lower pressing head is connected with a hydraulic arm, a cavity ofthe cavity die body is a tile cavity, the upper pressing head is connected with a demolding micro-pressure protecting device, and the demolding micro-pressure protecting device is linked with a hydra ulic machine. The invention has the advantages of saving the procedures of processing a square magnet into the tile magnet to achieve the aims of time-saving, money-saving and labor-saving; and changing the prior process of making the tilt material by using the square material to achieve the efficacy of processing corner-free materials and reducing the loss of powder quantity. The mould improves the designs and the process manufacture of a cavity die inner cavity and the upper and lower pressing heads. A forming bidirectional pressing special device and the demolding micro-pressure protecting special device are adopted to ensure the even density of a forming blank and reduce the phenomena of hidden cracking, edge breaking, corner defect, and the like caused by the density difference.
Description
Technical field
The present invention relates to a kind of one-shot forming technique and mould thereof that is used for the sintered Nd-Fe-B permanent magnet of motor.
Background technology
Nd-Fe-Bo permanent magnet material has been widely used in various fields such as electronics, computer, automobile, machinery, the energy, medicine equipment owing to its high magnetic accumulated energy, high-coercive force, high serviceability temperature.And the sintered Nd-Fe-B permanent magnet magnetic shoe that is used for motor occupies critical role, and existing sintered NdFeB series permanent magnetic material manufacturing process flow is as follows: raw material preparation → melting → ingot casting → broken powder process → magnetic field orientating die mould squarely magnet → sintering → tempering → be machined into tile-shaped magnet → surface treatment → detection.Because this technology does not have demoulding minute-pressure protective device, mainly rely on press upper cylinder half self pressure to finish the pressurize action, because press pressure is big; can reach 63 tons, be subjected to factor affecting such as oil mass and temperature, can cause the oil pressure instability; upper cylinder half pressure changes greatly, causes the product qualification rate of bursting apart low.And the magnet mould of magnetic field orientating die mould is square, therefore when the magnet behind the die mould is being applied on the motor, must the square shaped magnet by being machined into tile-shaped magnet, not only increase the difficulty of manufacture craft, but also time-consumingly take a lot of work expensively, also become a very necessary problem so improve the structure of mould.
Summary of the invention
First technical problem to be solved by this invention is to provide at above-mentioned prior art present situation that a kind of technology is simple, flow process is few and process boundless angle section material, reduce the one-shot forming technique of the sintered Nd-Fe-B permanent magnet that is used for motor of powder amount loss.
The present invention solves the technical scheme that first technical problem adopts: this is used for the one-shot forming technique of the sintered Nd-Fe-B permanent magnet of motor, may further comprise the steps: raw material preparation, melting, ingot casting, broken powder process, magnetic field orientating die mould become magnet, it is characterized in that: the formed magnet of described magnetic field orientating die mould is tile-shaped magnet, and this die mould becomes the technology of tile-shaped magnet to be:
A, required powder is placed in watt shape chamber of former die body;
B, seaming chuck is stretched into downwards in watt shape chamber of former die body, stop to move down after the powder to watt shape chamber of seaming chuck and former die body contacts by hydraulic press;
C, be positioned at electromagnet about watt shape chamber of former die body simultaneously to watt magnetic in the shape chamber orientation that magnetizes then;
D, when the magnetic field of magnetizing reaches 20000Gs, seaming chuck continues to press down, simultaneously the push-down head of former die body forms two-way compacting, when pressure reaches 2000kgf/cm from watt upwards extruding of bottom, shape chamber of former die body
2The time, release after keep-uping pressure 1～3 second;
E, will finish magnetize electromagnet demagnetization after the orientation action of powder;
Move on f, the seaming chuck and promote, push-down head moves synchronously and tile-shaped magnet is ejected and depanning in watt shape chamber simultaneously;
Tile-shaped magnet after the depanning carries out sintering, tempering, surface treatment finished product again.
Second technical problem to be solved by this invention be provide a kind of at above-mentioned prior art present situation and process boundless angle section material, reduce the loss of powder amount, become parison density evenly, reduce product because the one-shot forming technique medium-pressure type that is used to solve first technical problem of secretly splitting of causing of density contrast, disconnected limit and unfilled corner becomes the mould of magnet.
The present invention solves second technical scheme that technical problem adopted: this is used for the mould that the one-shot forming technique medium-pressure type becomes magnet; include seaming chuck; push-down head and former die body; push-down head is connected with hydraulic cylinder; it is characterized in that: the cavity in the described former die body is watt shape chamber; described push-down head stretches into watt bottom in shape chamber and forms watt bottom in shape chamber; and the upper end of push-down head is identical with the bottom shape of tile-shaped magnet; and described seaming chuck can be positioned at up or down watt shape chamber directly over; and its lower surface is identical with the upper surface shape of tile-shaped magnet; and seaming chuck is connected with demoulding minute-pressure protective device, and demoulding minute-pressure protective device and hydraulic press interlock are together.
As improvement; the structure of described demoulding minute-pressure protective device includes press slide, cylinder body, guide pillar, cylinder body seat board and the cylinder body lower bolster that is connected with hydraulic press; described seaming chuck fixes by connecting cylinder and cylinder body lower bolster; and guide pillar and the cylinder body seat board of cylinder body lower bolster by periphery be fixed together, and the cylinder body seat board is connected together by cylinder body and press slide.Compared with prior art, the present invention adopts the formed magnet of magnetic field orientating die mould to be tile-shaped magnet, and this die mould becomes the technology of tile-shaped magnet to be: a, required powder is placed in watt shape chamber of former die body; B, seaming chuck is stretched into downwards in watt shape chamber of former die body, stop to move down after the powder to watt shape chamber of seaming chuck and former die body contacts by hydraulic press; C, be positioned at electromagnet about watt shape chamber of former die body simultaneously to watt magnetic in the shape chamber orientation that magnetizes then; D, when the magnetic field of magnetizing reaches 20000Gs, seaming chuck continues to press down, simultaneously the push-down head of former die body forms two-way compacting, when pressure reaches 2000kgf/cm from watt upwards extruding of bottom, shape chamber of former die body
2The time, release after keep-uping pressure 1～3 second; E, will finish magnetize electromagnet demagnetization after the orientation action of powder; Move on f, the seaming chuck and promote, push-down head moves synchronously and tile-shaped magnet is ejected and depanning in watt shape chamber simultaneously; The advantage of this structure is: technology is oversimplified, and is about to original die mould squarely magnet, directly changes into pressing forming tile-shaped magnet, has saved the operation that is reprocessed into tile-shaped magnet by square magnet, saves time, saves money and saving of labor's purpose thereby reach; Have again, this process reform the original traditional handicraft of making watt shape of the fast material in side, reach the boundless angle section material of processing and reduce the loss of powder amount, thereby saved processing cost, and change cambered surface mill processing technology into by original line excision forming, thereby improved the product precision, overcome the shortcoming that the product that causes owing to line cutting processing poor surface smoothness is electroplated change in size.Mould of the present invention is made the design and processes of former type inner chamber, last push-down head and has been done bold transformation, has accomplished structure rationalization, assembling, easy to adjust in the forming process; In press-molding technology, adopted two-way compacting of moulding and demoulding minute-pressure protection isolated plant, thereby guaranteed that one-tenth parison density is even, reduce product because the phenomenons such as limit, unfilled corner of secretly splitting, break that density contrast causes; (be press magnetize distance between the cartridge) shortens because orientation distance, improved product magnetic property intensity and uniformity.
Description of drawings
Fig. 1 is pack into configuration state schematic diagram in watt shape chamber of the magnetic in the embodiment of the invention;
Fig. 2 be among Fig. 1 A to perspective view;
Fig. 3 is the structural representation that magnetic is in the magnetic field orientating state among Fig. 1;
Fig. 4 is the structural representation of magnetic completed state among Fig. 1;
Fig. 5 is that tile-shaped magnet is in the structural representation that demoulding state and seaming chuck and demoulding minute-pressure protective device cooperatively interact among Fig. 1.
Embodiment
Below in conjunction with accompanying drawing embodiment invention is described in further detail;
Extremely shown in Figure 5 as Fig. 1, the one-shot forming technique of the sintered Nd-Fe-B permanent magnet that is used for motor of present embodiment, may further comprise the steps: raw material preparation, melting, ingot casting, broken powder process, magnetic field orientating die mould become magnet, the formed magnet of described magnetic field orientating die mould is tile-shaped magnet 5, and this die mould becomes the technology of tile-shaped magnet 5 to be:
A, required powder 51 is placed in watt shape chamber 21 of former die body 2;
B, seaming chuck 1 is stretched into downwards in watt shape chamber 21 of former die body 2, stop to move down after the powder 51 to watt shape chamber 21 of seaming chuck 1 and former die body 2 contacts by hydraulic press;
C, then at the electromagnet in watt shape chamber about 21 that is positioned at former die body 2 simultaneously to watt magnetic in shape chamber 21 51 orientation that magnetizes;
D, when the magnetic field of magnetizing reaches 20000Gs, seaming chuck 1 continues to press down, simultaneously the push-down head 3 of former die body 2 forms two-way compacting, when pressure reaches 2000kgf/cm from the upwards extruding of watt 21 bottoms, shape chamber of former die body 2
2The time keep-uped pressure 1～3 second after the time release;
E, will finish magnetize electromagnet demagnetization after the orientation action of powder;
Move on f, the seaming chuck 1 and promote, push-down head 3 moves synchronously and tile-shaped magnet 5 is ejected and depanning in watt shape chamber 21 simultaneously;
Tile-shaped magnet 5 after the depanning carries out sintering, tempering, surface treatment finished product again.
To shown in Figure 5, the one-shot forming technique medium-pressure type that is used for claim 1 of present embodiment becomes the mould of magnet, includes seaming chuck 1, push-down head 3 and former die body 2 as Fig. 1, and push-down head 3 is connected with hydraulic arm.Cavity in the former die body 2 is a watt shape chamber 21, described push-down head 3 stretches into watt bottom in shape chamber 21 and forms watt bottom in shape chamber 21, and the upper end of push-down head 3 is identical with the bottom shape of tile-shaped magnet 5, and described seaming chuck 1 can be positioned at up or down watt shape chamber 21 directly over, and its lower surface is identical with the upper surface shape of tile-shaped magnet 5, and seaming chuck 1 is connected with demoulding minute-pressure protective device 4, and demoulding minute-pressure protective device 4 links together with hydraulic press; This demoulding minute-pressure protective device 4 includes press slide 42, cylinder body 43, guide pillar 44, cylinder body seat board 41 and the cylinder body lower bolster 45 that is connected with hydraulic press; described seaming chuck 1 fixes with cylinder body lower bolster 45 by connecting cylinder 46; and the guide pillar 44 of cylinder body lower bolster 45 by periphery is fixed together with cylinder body seat board 41, and cylinder body seat board 41 is connected together by cylinder body 43 and press slide 42.
Claims (1)
1. the mould of the one-shot forming technique of a sintered Nd-Fe-B permanent magnet that is used for motor, include seaming chuck (1), push-down head (3) and former die body (2), push-down head (3) is connected with hydraulic arm, it is characterized in that: the cavity in the described former die body (2) is watt shape chamber (21), described push-down head (3) stretches into watt bottom in shape chamber (21) and forms watt bottom in shape chamber (21), and the upper end of push-down head (3) is identical with the bottom shape of tile-shaped magnet (5), and described seaming chuck (1) can be positioned at up or down watt shape chamber (21) directly over, and its lower surface is identical with the upper surface shape of tile-shaped magnet (5), and seaming chuck (1) is connected with demoulding minute-pressure protective device (4), and demoulding minute-pressure protective device (4) links together with hydraulic press, described demoulding minute-pressure protective device (4) includes the press slide (42) that is connected with hydraulic press, cylinder body (43), guide pillar (44), cylinder body seat board (41) and cylinder body lower bolster (45), described seaming chuck (1) fixes with cylinder body lower bolster (45) by connecting cylinder (46), and cylinder body lower bolster (45) is fixed together by peripheral guide pillar (44) and cylinder body seat board (41), and cylinder body seat board (41) is connected together by cylinder body (43) and press slide (42);
This mould is used for following technology: this technology may further comprise the steps: raw material preparation, melting, ingot casting, broken powder process, magnetic field orientating die mould become magnet, the formed magnet of described magnetic field orientating die mould is tile-shaped magnet (5), and this die mould becomes the technology of tile-shaped magnet (5) to be:
A, required powder (51) is placed in watt shape chamber (21) of former die body (2);
B, seaming chuck (1) is stretched into downwards in watt shape chamber (21) of former die body (2), stop to move down after the powder (51) to watt shape chamber (21) of seaming chuck (1) and former die body (2) contacts by hydraulic press;
C, be positioned at electromagnet about watt shape chamber (21) of former die body (2) simultaneously to the magnetic (51) in watt shape chamber (21) orientation that magnetizes then;
D, when the magnetic field of magnetizing reaches 20000Gs, seaming chuck (1) continues to press down, simultaneously the push-down head (3) of former die body (2) forms two-way compacting, when pressure reaches 2000kgf/cm from watt upwards extruding of bottom, shape chamber (21) of former die body (2)
2The time, release after keep-uping pressure 1～3 second;
E, will finish magnetize electromagnet demagnetization after the orientation action of powder;
Move on f, the seaming chuck (1) and promote, push-down head (3) moves synchronously and tile-shaped magnet (5) is ejected and depanning in watt shape chamber (21) simultaneously;
Tile-shaped magnet after the depanning (5) carries out sintering, tempering, surface treatment finished product again.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100610990A CN101582611B (en) | 2008-05-12 | 2008-05-12 | One-step forming process for sintered NdFeB permanent magnet of motor and mould thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100610990A CN101582611B (en) | 2008-05-12 | 2008-05-12 | One-step forming process for sintered NdFeB permanent magnet of motor and mould thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101582611A CN101582611A (en) | 2009-11-18 |
| CN101582611B true CN101582611B (en) | 2011-04-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008100610990A Expired - Fee Related CN101582611B (en) | 2008-05-12 | 2008-05-12 | One-step forming process for sintered NdFeB permanent magnet of motor and mould thereof |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101867267B (en) * | 2010-05-24 | 2012-05-30 | 浙江西子富沃德电机有限公司 | Technology for manufacturing neodymium iron boron (NdFeB) magnetic tile used for radial oriented motor and moulding mould thereof |
| CN103317130B (en) * | 2013-06-08 | 2016-01-20 | 江苏金石稀土有限公司 | A kind of mould and using method thereof preparing permanent-magnet material radial column |
| CN104966605A (en) * | 2015-07-29 | 2015-10-07 | 安徽万磁电子有限公司 | Forming process of sintered NdFeB tegular magnet and modular mold thereof |
| CN116638071B (en) * | 2023-07-26 | 2023-10-31 | 包头天石稀土新材料有限责任公司 | Auxiliary demolding jig and neodymium-iron-boron magnet pressing device and method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1062232A (en) * | 1990-12-04 | 1992-06-24 | 北京科技大学 | Produce the method for rare-earth iron-boron permanent magnetic material with the rare-earth iron-boron waste material |
| CN1293436A (en) * | 2000-09-28 | 2001-05-02 | 宁波金鸡钕铁硼强磁材料有限公司 | Technology and mould for sintering magnetic Nd-Fe-B ring by one-step shaping and radiating orientation |
| CN200947369Y (en) * | 2006-09-01 | 2007-09-12 | 李志平 | Aeolotropy sintering rare earth permanent magnet oriented molding device |
-
2008
- 2008-05-12 CN CN2008100610990A patent/CN101582611B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1062232A (en) * | 1990-12-04 | 1992-06-24 | 北京科技大学 | Produce the method for rare-earth iron-boron permanent magnetic material with the rare-earth iron-boron waste material |
| CN1293436A (en) * | 2000-09-28 | 2001-05-02 | 宁波金鸡钕铁硼强磁材料有限公司 | Technology and mould for sintering magnetic Nd-Fe-B ring by one-step shaping and radiating orientation |
| CN200947369Y (en) * | 2006-09-01 | 2007-09-12 | 李志平 | Aeolotropy sintering rare earth permanent magnet oriented molding device |
Non-Patent Citations (1)
| Title |
|---|
| JP特开2005-197299A 2005.07.21 |
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| CN101582611A (en) | 2009-11-18 |
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Granted publication date: 20110413 Termination date: 20180512 |