CN101867267B - Technology for manufacturing neodymium iron boron (NdFeB) magnetic tile used for radial oriented motor and moulding mould thereof - Google Patents
Technology for manufacturing neodymium iron boron (NdFeB) magnetic tile used for radial oriented motor and moulding mould thereof Download PDFInfo
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- CN101867267B CN101867267B CN2010101819002A CN201010181900A CN101867267B CN 101867267 B CN101867267 B CN 101867267B CN 2010101819002 A CN2010101819002 A CN 2010101819002A CN 201010181900 A CN201010181900 A CN 201010181900A CN 101867267 B CN101867267 B CN 101867267B
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Abstract
The invention discloses a technology for manufacturing neodymium iron boron (NdFeB) magnetic tiles used for a radial oriented motor, and a moulding mould thereof. The technology comprises the following steps: a, pouring powder into the square cavity of the female mould of a square magnet moulding mould; b, driving an upper punch to slide downwards and stopping sliding until the upper punch is contacted with the powder; c, magnetizing the powder by two electromagnets simultaneously for orientation; d, sliding the upper punch downwards continuously when the value of magnetizing is up to a set value, and sliding a lower punch upwards at the same time, pressing the powder from two directions by the upper punch and the lower punch to form a square magnet; e, demagnetizing the two electromagnets reversely; f, sliding the upper punch upwards and sliding the lower punch upwards to eject the moulded square magnet out of the square cavity; and g, placing the square magnet in the depressed part of a sintering ceramic plate of a magnetic tile moulding mould for sintering to form a magnetic tile, wherein the shape of the bottom face of the depressed part is a convex arc or a concave arc. The manufacturing technology of the invention can simply realize the moulding of large ultrathin heteromorphic magnet tiles, thus saving processing cost, reducing material use amount and improving product quality.
Description
Technical field
The invention belongs to motor accessory manufacturing technology field, particularly a kind of manufacture craft of neodymium iron boron (NdFeB) magnetic tile used for radial oriented motor and mould thereof.
Background technology
The application of neodymium iron boron product is very extensive, and its shape of product is variation, complicated gradually also.The forming method of neodymium iron boron product generally adopts the powder die mould to form at present, for practicing thrift formulation cost, pursues the magnetic property maximization simultaneously, and the orientation of avoiding magnetizing is insufficient, generally adopts the pressing direction press vertical with the direction of orientation that magnetizes to accomplish.Because it is too high that the pressed density of this forming method can not be provided with, and generally is in 4-5g/cm
3So, cause green strength very poor.And when product was abnormity, product just was difficult to be directly formed to the blank of required form, particularly thin, bigger than normal partially product, if straight forming, its rate of finished products is very low, and for example thickness≤8mm, cambered surface are amassed>=400mm
2Motor use big magnetic shoe.At present, most of this series products all is the square blank that is pressed into bulk earlier, goes out required form by the line cutting processing after accomplishing, and the defective that the method exists is: processing cost is high, and waste of material is big, recovery rate is low, consistency is poor.The method that one-shot forming watt type magnet when compacting is also arranged at present; And this type of one-time formed mode is because magnetic shoe is thin, sintering temperature is too high; Cause the magnetic shoe radian to be difficult to control; Do not reach both provisioning requests, like Chinese patent number or application number 00125615.7,200820222089.6,200810061099.0 disclosed contents.
In addition, also there is open defect in the orientation technology that magnetizes at present, and it realizes that radial magnetizing orientation difficulty is very big, generally all is to adopt the parallel magnetization orientation, and this has just limited to the range of application of neodymium iron boron, and has reduced the effect of product.
Above-mentioned present situation in view of prior art; The moulding scheme of the big magnetic shoe of the research one ultra-thin abnormity of cover is sought a kind of simple radial magnetizing method for alignment, is two important topics of neodymium iron boron production technology; If effectively solved; With the processing cost that reduces a lot of neodymium iron boron products significantly, improve the quality of neodymium iron boron product, even widen the range of application of neodymium iron boron product.
Summary of the invention
Technical problem to be solved by this invention is the situation to prior art, provides that a kind of technology is simple, the manufacture craft of the neodymium iron boron (NdFeB) magnetic tile used for radial oriented motor of high conformity, recovery rate is high, waste of material is few sinter molding.
The technical scheme that technical solution problem of the present invention is taked is following: the manufacture craft of neodymium iron boron (NdFeB) magnetic tile used for radial oriented motor, and it carries out according to the following steps:
A, powder poured in the rectangular cavity of former of square magnet mould;
B, driving upper punch stretch in the described rectangular cavity to lower slider, after upper punch touches powder, stop to lower slider;
Two electromagnet of c, former are the orientation that magnetizes of the powder in the square shaped chamber simultaneously;
D, when the magnetic field intensity that magnetizes arrives set point, upper punch continues to lower slider, low punch also begins upwards slip simultaneously, upper punch, low punch carry out two-way compacting and form square magnet powder;
E, two electromagnet are oppositely demagnetized;
F, upper punch upwards slide, and the square magnet that upwards slides moulding of low punch ejects described rectangular cavity simultaneously;
G, the square magnet of moulding is positioned in the depressed part of sintered ceramic plate of magnetic shoe mould and carries out sintering, described depressed part bottom surface is convex or arcs of recesses, and sintering forms magnetic shoe.
Preferably; The mould of said square magnet comprises former, upper punch, low punch; Former comprises two blocks of electromagnet, the opposite face of two electromagnet parallel and between leave the space, the relative inner face of two electromagnet is fixedly linked through two square bars; The medial surface of the medial surface of two electromagnet and two side's bars forms a rectangular cavity, and rectangular cavity is used for the splendid attire powder; Upper punch is corresponding to the upper shed of rectangular cavity, and upper punch can slide along rectangular cavity; Low punch is corresponding to the under shed of rectangular cavity, and low punch can slide along rectangular cavity.
Preferably, the length and width of sintered ceramic plate depressed part and square magnet are suitable.
Preferably, after the f step, the square magnet of moulding is carried out Vacuum Package, the square magnet that vacuum seal is installed is put into isostatic pressing machine and is waited static pressure to handle.
Preferably, in the g step, when square magnet was positioned over the depressed part sintering of sintered ceramic plate, a ceramic cover plate pressurizeed on the top of square magnet.
Preferably, the magnetic shoe of g step aftershaping is repaired.
Preferably, d step: when the magnetic field intensity that magnetizes arrived 15-20T, upper punch continued to lower slider; Low punch begins upwards to slide; Upper punch, low punch carry out two-way compacting to powder and form the square magnet of moulding, when pressure reaches 5-8MPa, and release behind the 1-3s that keep-ups pressure.
The present invention also provides a kind of mould of used for radial oriented motor neodymium iron boron square magnet; Comprise former, upper punch, low punch; Former comprises two blocks of electromagnet, the opposite face of two electromagnet parallel and between leave the space, the relative inner face of two electromagnet is fixedly linked through two square bars; The medial surface of the medial surface of two electromagnet and two side's bars forms a rectangular cavity, and rectangular cavity is used for the splendid attire powder; Upper punch is corresponding to the upper shed of rectangular cavity, and upper punch can slide along rectangular cavity; Low punch is corresponding to the under shed of rectangular cavity, and low punch can slide along rectangular cavity.
Preferably; The medial surface of described two blocks of electromagnet respectively forms two vertical square grooves, and the square groove of two electromagnet is corresponding one by one, and square groove and described side's bar are suitable; Two side's bars insert respectively in the corresponding square groove of two electromagnet, and link to each other through bolt with two electromagnet.
The present invention also provides a kind of mould of neodymium iron boron (NdFeB) magnetic tile used for radial oriented motor, and it comprises sintered ceramic plate, and sintered ceramic plate forms depressed part, and the bottom surface of this depressed part is convex or arcs of recesses.
The manufacture craft of neodymium iron boron (NdFeB) magnetic tile used for radial oriented motor of the present invention can the big magnetic shoe of the ultra-thin abnormity of simple realization moulding, it has been practiced thrift the machine work cost, has reduced material usage, has improved product quality; And, help further widening the range of application of neodymium iron boron product for the realization of radial oriented effect provides a kind of feasible method.
Description of drawings
Fig. 1 is the vertical view of embodiment of the invention square magnet mould.
Fig. 2 is that the A of Fig. 1 when low punch (supreme) is to view.
Fig. 3 is that the A of Fig. 1 (when going up low punch) is to view.
Fig. 4 is the longitudinal sectional view of Fig. 3.
Fig. 5 is the stereochemical structure exploded view of square magnet mould.
Fig. 6 is the structural representation of magnet on ceramic wafer before the sintering.
Fig. 7 is the structural representation of magnet on ceramic wafer behind the sintering.
Fig. 8 is the vertical orientated structural representation of magnet.
Fig. 9 is the radial oriented structural representation of magnet.
Figure 10 is the structural representation of another embodiment ceramic wafer.
Embodiment
Below in conjunction with accompanying drawing and embodiment detailed description is done in invention.
The manufacture craft of neodymium iron boron (NdFeB) magnetic tile used for radial oriented motor of the present invention adopts the mould of square magnet and the mould of magnetic shoe.Shown in Fig. 1-5; The mould of square magnet comprises former 1, upper punch 3, low punch 4; Former 1 comprises that the relative inner face of two blocks of electromagnet 91,92 and two side's bars, 101,102, two electromagnet 91,92 parallels and leave the space between the two, and the medial surface of electromagnet 91,92 forms two vertical square grooves; Square groove and square bar 101,102 are suitable, and the square groove of two electromagnet is corresponding one by one.Two side's bars 101,102 insert respectively in the corresponding square groove of two electromagnet, and fix (as passing through bolt) with two electromagnet and link to each other.Surround a rectangular cavity 2 by two electromagnet 91,92, two side's bars 101,102, rectangular cavity 2 is used for splendid attire powder 5.Upper punch 3 be positioned at rectangular cavity 2 upper sheds directly over; Adapt to the upper shed of rectangular cavity 2 its slidingtype; Under the driving of external force (like hydraulic press), upper punch 3 can slide up and down along rectangular cavity 2, and its lower surface is identical with the upper surface shape of moulding square magnet 7; Low punch 4 be positioned at rectangular cavity 2 under sheds under; Adapt to the under shed of rectangular cavity 2 its slidingtype; Under the driving of external force (like hydraulic press), can slide up and down along rectangular cavity 2, and the upper surface of low punch 4 is identical with the underside shape of moulding square magnet 7.
Shown in Fig. 6-7, the mould of magnetic shoe comprises sintered ceramic plate 6, and sintered ceramic plate 6 forms depressed part, and the bottom surface of this depressed part is convex, and the square magnet 7 of the length and width specification of this depressed part and moulding is suitable.
Elaborate with the technology of neodymium iron boron (NdFeB) magnetic tile product to make a certain concrete motor below, its step is (can with reference to figure 1-9) as follows:
A, take by weighing the powder weight 215～225g of elements such as containing neodymium, iron, dysprosium, niobium, boron, copper, cobalt, aluminium; Granularity 3.6～4.2 μ m of powder; Then the powder that weighs up 5 is poured in the rectangular cavity 2 of former 1 of square magnet mould, the under shed of rectangular cavity 2 is sealed by low punch 4;
B, drive upper punch 3 to lower slider through hydraulic press, upper punch 3, stretches in the rectangular cavity 2 of former 1 to lower slider with speed 0.2-0.3m/s, after upper punch 3 touches powder 5, stops to lower slider;
Two blocks of electromagnet 91,92 of c, former 1 are the orientation that magnetizes of the powder 5 in the square shaped chamber 2 simultaneously, and time 1-3s magnetizes;
D, when the magnetic field intensity that magnetizes arrives 15-20T (like 17T); Upper punch 3 continues to lower slider, and low punch 4 also begins upwards to slide simultaneously, and last low punch carries out two-way compacting to powder 5; When pressure reaches 5-8MPa (like 6MPa), release behind the 1-3s that keep-ups pressure; Thereby compacting forms square magnet 7;
E, two blocks of electromagnet 91,92 are oppositely demagnetized;
F, upper punch 3 is upwards slided, low punch 4 upwards slides and progressively square magnet 7 is ejected rectangular cavity 2 simultaneously;
G, adopt compound white bag to carry out Vacuum Package the square magnet of moulding 7, the square magnet 7 that vacuum seal installs is put into isostatic pressing machine, hydraulic oil is arranged in the press, adopt this mode can make each face of square magnet 7 receive uniform pressure.After static pressure such as process were handled, the density of square magnet 7 just can improve;
H, square magnet 7 are positioned in the depressed part of sintered ceramic plate 6; The bottom surface of this depressed part is convex; The ceramic cover plate of pressurization constant weight on square magnet 7, this measure effect is that square shaped magnet 7 has a power of subsiding downwards, and carries out sintering; Sintering temperature is 40～1080 ℃, and the time is 25-28h.Because square magnet 7 is blanks; In this sintering process; It shrinks naturally and subsides, and is magnetic shoe 8 thereby progressively form tile-shaped magnet, and in the natual subside process; Realized that vertical orientated (referring to Fig. 8) changes radial oriented (referring to Fig. 9) into, thereby the square magnet 7 of perpendicular magnetic field orientation compacting becomes radial oriented magnetic shoe 8 behind sintering;
I, the magnetic shoe 8 of moulding is repaired.
Above-mentionedly just the present invention is made a certain concrete motor and describe with the technology of neodymium iron boron (NdFeB) magnetic tile product, during other specific product of making neodymium iron boron (NdFeB) magnetic tile, each parameter part that all can change, and these changes also should be regarded as protection scope of the present invention.
Certainly, the depressed part bottom surface of the foregoing description sintered ceramic plate 6 can be an arcs of recesses also, and referring to Figure 10, it also can reach identical or close technique effect, is not described in detail in this.
The present invention will suppress the vertical orientated square magnet (green compact) in back and be put in the depression of ceramic wafer and carry out sintering, and green compact have characteristics such as loose, that density is low, through oversintering; It shrinks naturally and subsides; Meanwhile, vertical orientatedly become radial orientedly, finally form tile-shaped magnet.The present invention when the sintering on mould control magnetic shoe radian, i.e. adjustment through sintering mold is the radian of may command magnetic shoe just, its controllable shapes degree is high, and adopts radial oriented magnetic shoe can improve the energy that motor produces greatly in gap field.
In addition, the mould of aforementioned square magnet, the mould of magnetic shoe can apply to separately in the manufacture craft of other motor with neodymium iron boron, and this also is the content of requirement protection of the present invention.
More than preferred implementation of the present invention is specified; Corresponding those of ordinary skill in the art; According to thought provided by the invention, the part that on concrete execution mode of the present invention and range of application, all can change, these changes also should be regarded as protection scope of the present invention.In sum, this description should not be construed as the restriction to protection range of the present invention.
Claims (7)
1. the manufacture craft of neodymium iron boron (NdFeB) magnetic tile used for radial oriented motor is characterized in that carrying out according to the following steps:
A, powder poured in the rectangular cavity of former of square magnet mould;
B, driving upper punch stretch in the described rectangular cavity to lower slider, after upper punch touches powder, stop to lower slider;
Two electromagnet of c, former are the orientation that magnetizes of the powder in the square shaped chamber simultaneously;
D, when the magnetic field intensity that magnetizes arrives set point, upper punch continues to lower slider, low punch also begins upwards slip simultaneously, upper punch, low punch carry out two-way compacting and form square magnet powder;
E, two electromagnet are oppositely demagnetized;
F, upper punch upwards slide, and the square magnet that upwards slides moulding of low punch ejects described rectangular cavity simultaneously;
G, the square magnet of moulding is positioned in the depressed part of sintered ceramic plate of magnetic shoe mould and carries out sintering, the bottom surface of said depressed part is convex or arcs of recesses, forms magnetic shoe through sintering.
2. the manufacture craft of neodymium iron boron (NdFeB) magnetic tile used for radial oriented motor as claimed in claim 1; It is characterized in that: the mould of said square magnet comprises former, upper punch, low punch; Former comprises two blocks of electromagnet, the opposite face of two electromagnet parallel and between leave the space, the relative inner face of two electromagnet is fixedly linked through two square bars; The medial surface of the medial surface of two electromagnet and two side's bars forms a rectangular cavity, and rectangular cavity is used for the splendid attire powder; Upper punch is corresponding to the upper shed of rectangular cavity, and upper punch can slide along rectangular cavity; Low punch is corresponding to the under shed of rectangular cavity, and low punch can slide along rectangular cavity.
3. the manufacture craft of neodymium iron boron (NdFeB) magnetic tile used for radial oriented motor as claimed in claim 1, it is characterized in that: the length and width and the square magnet of said sintered ceramic plate depressed part are suitable.
4. the manufacture craft of neodymium iron boron (NdFeB) magnetic tile used for radial oriented motor as claimed in claim 1 is characterized in that: after the f step, the square magnet of moulding is carried out Vacuum Package, the square magnet that vacuum seal is installed is put into isostatic pressing machine and is waited static pressure to handle.
5. the manufacture craft of neodymium iron boron (NdFeB) magnetic tile used for radial oriented motor as claimed in claim 1, it is characterized in that: in the g step, when square magnet was positioned over the depressed part sintering of sintered ceramic plate, a ceramic cover plate pressurizeed on the top of square magnet.
6. the manufacture craft of neodymium iron boron (NdFeB) magnetic tile used for radial oriented motor as claimed in claim 1, it is characterized in that: the magnetic shoe to g step aftershaping is repaired.
7. the manufacture craft of neodymium iron boron (NdFeB) magnetic tile used for radial oriented motor as claimed in claim 1; It is characterized in that: the d step: when the magnetic field intensity that magnetizes arrives 15-20T; Upper punch continues to lower slider, and low punch begins upwards to slide, and upper punch, low punch carry out two-way compacting to powder and form the square magnet of moulding; When pressure reaches 5-8MPa, release behind the 1-3s that keep-ups pressure.
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| CN102773477A (en) * | 2012-08-16 | 2012-11-14 | 俞红霞 | Vacuumizing forming device and method of magnetic field hydraulic machine |
| CN103236347B (en) * | 2013-04-19 | 2015-06-17 | 山西汇镪磁性材料制作有限公司 | Method for manufacturing magnetic tiles with magnetic field lines diffusing in radiating mode |
| CN103909261B (en) * | 2014-03-28 | 2016-01-13 | 宁波恒燊磁业科技有限公司 | One can improve the conforming equipment of sintering and molding neodymium iron boron green density and method |
| 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 |
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| JPS6016166A (en) * | 1983-07-06 | 1985-01-26 | Mitsubishi Electric Corp | Manufacture of ferrite magnet pole of magnet motor stator |
| JP2005277180A (en) * | 2004-03-25 | 2005-10-06 | Tdk Corp | Magnet-manufacturing method, magnetic powder forming method and dry forming equipment |
| CN1276898C (en) * | 2004-08-03 | 2006-09-27 | 河北冶金科技股份有限公司 | Radiation magnetic field sintered rare-earth permanent magnetic tile and its magnetic processing method |
| JP2006228937A (en) * | 2005-02-17 | 2006-08-31 | Tdk Corp | Manufacturing method of rare earth sintered magnet and device for molding in magnetic field |
| CN101582611B (en) * | 2008-05-12 | 2011-04-13 | 宁波永久磁业有限公司 | One-step forming process for sintered NdFeB permanent magnet of motor and mould thereof |
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