CN203817347U - Magnetic field assistance direct casting device for NdFeB (neodymium iron boron) permanent magnet material - Google Patents
Magnetic field assistance direct casting device for NdFeB (neodymium iron boron) permanent magnet material Download PDFInfo
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- CN203817347U CN203817347U CN201420128689.1U CN201420128689U CN203817347U CN 203817347 U CN203817347 U CN 203817347U CN 201420128689 U CN201420128689 U CN 201420128689U CN 203817347 U CN203817347 U CN 203817347U
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Abstract
The utility model discloses a magnetic field assistance direct casting device for an NdFeB (neodymium iron boron) permanent magnet material. A main magnet of the device is an annular magnet which radially magnetizes; a disc-shaped first rejecting magnet with the axially upward magnet field direction is arranged below the center of the main magnet; a disc-shaped second rejecting magnet which radially magnetizes is arranged on the periphery of the first rejecting magnet; a regulation and control magnet is arranged on the upper end of the main magnet; a second soft iron is arranged above the regulation and control magnet; a first soft iron is arranged on the outer side of the regulation and control magnet; an annular magnet guide magnet which downwards magnetizes along the axial direction is arranged on the outer side of the main magnet. Compared with a material which is prepared without adding a magnetic field, a material which is prepared by the magnetic field assistance direct casting device has the advantages that the magnetic performance is greatly promoted, the preparation technology is simple, the cost is lower, and the product is dense, and the device is suitable for industrial production.
Description
Technical field
The utility model relates to a kind of preparation facilities of Nd-Fe-Bo permanent magnet material, particularly the auxiliary direct casting device in a kind of magnetic field of Nd-Fe-Bo permanent magnet material.
Background technology
Neodymium iron boron (NdFeB) base alloy (comprise heterogeneity Xi Tu ?iron/Gu ?boron alloy) can be best as room temperature comprehensive magnetic rare earth permanent-magnetic material, be widely used in all kinds of electronic products, its market value has approached two of permanent-magnet material/rising year by year in the lump.The preparation of NdFeB magnet is the main powder metallurgy route that adopts at present, first obtains Magnaglo by diverse ways, then obtains sintered magnet, bonded permanent magnet and heat distortion magnet by sintering, bonding or thermal deformation (die forging).Magnet complicated process of preparation, operation are various, and the existence of powder metallurgy defect also makes the overall magnetic property of material reduce.In addition there is coarse grains, cannot prepare the shortcoming of Nanocomposite magnet in sintered magnet; In bonded permanent magnet, binding agent causes magnet density to reduce and remanent magnetism declines, is difficult to obtain anisotropy.Therefore, development low cost, the simple high fine and close NdFeB magnet technology of preparing of technique seem extremely important.
Copper mold casting method is directly cast neodymium iron boron magnetic body in recent years, in casting process, inject the copper mold of certain size and shape with the poor alloy by melting of certain pressure, when metallic solution touches after copper mold, the cooling sample that obtains copper mold inner cavity size rapidly, this preparation method has following advantage: first simplified operation, reduced cost; Next has solved the powder metallurgy defect problem in material; The 3rd has improved the density of magnet.
But due to the difference in casting process medium casting core and surface cool speed, the outer surface cooling velocity that often first contacts copper mold is very fast, larger degree of supercooling makes it skip crystallization process and has obtained amorphous phase or less nanocrystalline of crystal grain, and at foundry goods core, due to the existence of thermograde, cooling velocity is far below surperficial cooling velocity, and crystal grain is easy to forming core and grows up.So just cause foundry goods overall structure inhomogeneous, the raising of the comprehensive magnetic energy on magnet and the design of subsequent heat treatment have produced larger impact, and the application of limit copper mold casting method in actual production.Due to the above restriction existing, its magnetic property has been difficult to point obtain larger raising by being adjusted to, is the effective way that increases substantially magnetic property and prepare anisotropic magnet.
Utility model content
The purpose of this utility model is to overcome the shortcoming existing in prior art, provides a kind of completely fine and close, and metallurgical imperfection is less, and even tissue, the auxiliary direct casting device in magnetic field of the anisotropic Nd-Fe-Bo permanent magnet material that crystal grain is tiny.
The auxiliary direct casting device in the utility model magnetic field adds an assisted casting high-intensity magnetic field that is parallel to casting direction in casting process, provide in target area 0.7 ?the magnetostatic field of 1.2T, effect by magnetic field makes grain orientation, one step forms anisotropic magnet, and its crystal grain of refinement, make microstructure homogenization.And as long as change the die cavity of casting mould, just can prepare different size and big or small neodymium iron boron magnetic body, to meet different product requirement.
The purpose of this utility model is achieved through the following technical solutions:
The auxiliary direct casting device in magnetic field of Nd-Fe-Bo permanent magnet material, comprises the first repulsive magnets, the second repulsive magnets, magnet guiding magnet, main magnet, regulation and control magnet, the first soft iron and the second soft iron; Described main magnet is the radial annular magnet magnetizing; It is axial discoidal the first repulsive magnets upwards that main magnet center below is provided with a magnetic direction, and the first repulsive magnets periphery is provided with the second repulsive magnets of the radial annular magnetizing; Main magnet upper end is provided with regulation and control magnet, and the magnetic direction of regulation and control magnet is for downward vertically; Above regulation and control magnet, be provided with the second soft iron, be provided with the first soft iron in the outside of regulation and control magnet, main magnet outside is provided with the magnet guiding magnet of an annular magnetizing vertically downwards; The cylindrical cavity diameter of movement of the second soft iron, regulation and control magnet, main magnet center is identical; In cavity structure, be target area from the second soft iron, regulation and control magnet to the long region of main magnet length 40mm-100mm; Target area obtains an axial magnetic field, and mean value size is 0.7T-1.2T.
Preferably, be provided with passage in the second repulsion magnet center.The first repulsive magnets, magnet guiding magnet, main magnet and regulation and control magnet are the radial ring magnet that magnetizes, and are spliced into cirque structure by eight unidirectional arc pieces that magnetize.The first repulsive magnets and the second repulsive magnets equal thickness.Main magnet is identical with regulation and control magnet radial dimension.
The utility model compared with prior art tool has the following advantages and effect:
(1) the auxiliary direct casting device in the magnetic field of this Nd-Fe-B permanent magnetic supplies magnetic device with respect to other type, that simplicity of design, with low cost, easy to operate, device institute take up space is little, without any need for energy consumption and magnetic direction along axis direction upwards, be parallel to casting direction contrary with casting direction, the effect that casting process magnetic field is played maximizes.
(2) sintering of preparing with tradition is compared with Agglutinate neodymium-iron-boron, save the processes such as powder process more loaded down with trivial details and that cost is very high, sintering or bonding, after melting is complete, directly one-step shaping, the geomery of sample can change with the design of copper mold, and operability is stronger.And preparation after sample, density is high, good mechanical property, metallurgical imperfection is few, has strengthened greatly resistance to corrosion and the service life of magnet.
(3) rising of transition element proportion, has improved Hard Magnetic Nd in magnet
2fe
14the content of B phase (be called for short 2:14:1 phase), has increased the magnetic property of magnet.
(4) magnet of casting under the strong auxiliary magnetic field that is parallel to casting direction is with respect to the sample that does not add magnetic field, and its coercivity and remanent magnetism are all greatly improved.Magnetic field add the forming core energy that has reduced material, more neodymium iron boron crystal grain has suppressed growing up of magnet Hard Magnetic phase crystal grain, has improved institutional framework.
(5) in the case of further improving the Curie temperature of neodymium iron boron or reducing neodymium iron boron crystallization temperature, be expected to make neodymium iron boron crystal grain c-axis to be orientated along external magnetic field, form anisotropic magnet.
Brief description of the drawings
Fig. 1 is the structural representation of the auxiliary direct casting device in magnetic field of Nd-Fe-Bo permanent magnet material.
Fig. 2 is center section plan in Fig. 1.
Fig. 3 is the magnetic line of force distribution map of permanent magnet systems.
Fig. 4 is the Nd of preparation in embodiment 1
45co
10fe
30al
10b
5alloy adds the room temperature X-ray diffractogram of He Bujia magnetic field, magnetic field casting.
Fig. 5 is the Nd of preparation in embodiment 2
35co
20fe
30al
10b
5alloy adds the room temperature X-ray diffractogram of He Bujia magnetic field, magnetic field casting.
Fig. 6 is the Nd of preparation in embodiment 1
45co
10fe
30al
10b
5the sample of preparation adds the magnetic property curve of casting under He Bujia magnetic field, magnetic field.
Fig. 7 is the Nd of preparation in embodiment 2
35co
20fe
30al
10b
5the sample of preparation adds the magnetic property curve of casting under He Bujia magnetic field, magnetic field.
Detailed description of the invention
Below in conjunction with embodiment and accompanying drawing, the utility model will be further described, but embodiment of the present utility model is not limited to this.
Embodiment 1
Fig. 1 is the structural representation of the auxiliary direct casting device in magnetic field of Nd-Fe-Bo permanent magnet material, and in figure, arrow represents magnetizing direction.As shown in Figure 1, 2, direct casting device is assisted in the magnetic field of Nd-Fe-Bo permanent magnet material, comprises the first repulsive magnets 1, the second repulsive magnets 2, magnet guiding magnet 3, main magnet 4, regulation and control magnet 5, the first soft iron 6 and the second soft iron 7; Main magnet 4 is the radial annular magnet magnetizing; It is the second repulsive magnets 2 that axial discoidal the first repulsive magnets 1, the first repulsive magnets 1 periphery is upwards provided with the radial annular magnetizing that main magnet 4 central lower are provided with a magnetic direction; The preferred uniform thickness of the first repulsive magnets 1 and the second repulsive magnets 2 coordinates; The first repulsive magnets 1 and the second repulsive magnets 2 make the magnetic field line of main magnet 4 in axial direction set upwards; Main magnet 4 upper ends are provided with regulation and control magnet 5, and the magnetic direction of regulation and control magnet 5 is for downward vertically, and effect is to stop magnetic field line deflection laterally too early, the length that extends parallel magnetic field; Preferred main magnet 4 is identical with regulation and control magnet 5 radial dimensions; Above regulation and control magnet 5, be provided with the second soft iron 7, the effect that is provided with the first soft iron 6, the first soft irons 6 and the second soft iron 7 in the outside of regulation and control magnet 5 is that the guiding magnetic line of force returns, and avoids to external radiation; Main magnet 4 outsides are provided with the magnet guiding magnet 3 of an annular magnetizing vertically downwards, and effect is to adjust Magnetic Circuit Shape.The cylindrical cavity diameter of movement at the second soft iron 7, regulation and control magnet 5, main magnet 4 centers is identical; In cavity structure, be the long Nei Wei target area, region of 40mm-100mm from the second soft iron 7, regulation and control magnet 5 to main magnet 4 length; Target area obtains an axial magnetic field, and mean value size is set as 0.7T-1.2T.For making magnetic field gather as far as possible target area, the utility model adopts the radial charged magnet of circular ring structure, the bottom permanent magnet repulsion magnetic line of force.Preferably, be provided with passage 8 at the second repulsive magnets 2 centers, can coordinate the various needs of copper mold casting.
Main magnet 4 for toroidal magnet be the main source in magnetic field, magnetic direction is radial, point to the center of circle, its size has a significant effect to magnetic field of the goal intensity.Fix on diameter 120mm because of the restriction of Casting Equipment in full-size, main magnet 4 will obtain more large scale and be divided into two-layerly up and down, and the effect of the guiding magnet 3 in lower floor outside is that the guiding magnetic line of force is adjusted Magnetic Circuit Shape, is preferably dimensioned to be thick 10mm; First soft iron 6 effects in outside, upper strata are magnetic conductions, and dimensional requirement is not high, and thickness can be reduced to 5mm, is that main magnet 4 reserves greater room.The first repulsive magnets 1 of bottom, the second repulsive magnets 2 play the effect of repelling the magnetic line of force jointly, make the magnetic line of force walk toward top as far as possible; Wherein the magnetic direction of the first repulsive magnets 1 is vertically upwards, Main Function is to repel the magnetic line of force, the magnetic direction of the second repulsive magnets 2 is radial to the center of circle, except coordinating with the first repulsive magnets 1 effect of playing the better repulsion magnetic line of force, also plays the effect of the guiding magnetic line of force.The passage 8 of the reserved diameter 10mm in bottom center.The magnetic direction of main magnet 4 regulation and control magnet 5 is above downward vertically, is the magnet that most important regulation and control Magnetic Circuit Shape extends strong field.Regulation and control magnet 5 can stop the magnetic line of force to depart from laterally too early effectively, makes the magnetic line of force continue up to walk vertically, has extended available magnetic field space.
In the utility model, the first repulsive magnets 1, magnet guiding magnet 3, main magnet 4 and regulation and control magnet 5 are the radial ring magnet that magnetizes, and available eight unidirectional arc pieces that magnetize are spliced into annulus and substitute; Permanent magnet is rare-earth Nd-Fe-B permanent magnet; Conducting magnet core framework and permeability magnetic material are electrical pure iron; The available field region of this device be of a size of whole system correspondingly-sized 30% ?50%.Target area can provide 0.7T ?the permanent magnetic field of 1.2T size, this magnetic direction is parallel to casting direction.
The magnetic field that the auxiliary direct casting device in the magnetic field of Nd-Fe-Bo permanent magnet material can provide in the situation Imitating result of magnet use neodymium iron boron N50M as shown in Figure 3.Fig. 3 represents on axis from system bottom surface (distance=0) axial component numerical value to the magnetic induction density B of system top (Z=0.09m).Can find out that distance (0.05-0.09) m scope internal magnetic field is strong and have certain gradient, magnetic field mean value reaches 0.7T, and maximum position is 1T.In addition analog result show, the component of two other direction (X/Y direction) of magnetic induction density B compared with axial component (range direction) very I to ignore, so obtained satisfactory magnetic field in target area.Be designed to external diameter 40mm and cast accordingly copper mold, internal diameter 2mm, just can embed the cylindrical cavity inside of this device, and internal diameter is positioned at magnetic field of the goal region.
Embodiment 1
Step 1: by Nd
45co
10fe
30al
10b
5in the ratio batching of (atomic ratio); Sample gross weight is 10g, and wherein Nd, Co, Fe, Al, B are respectively 7.1639g, 0.6494g, 1.8459g, 0.2972g, 0.0724g.
Step 2: the raw material that step 1 is prepared is put into electric arc furnaces, is evacuated to 10
?3pa; after cleaning burner hearth by high-purity argon, fill the high-purity argon gas a little less than 1 atmospheric pressure (about 0.1MPa); under high-purity argon gas protection repeatedly 1000 ?at 1500 DEG C melting to melting 5 times, smelting time 2 ?3 minutes, obtain the uniform button-type alloy cast ingot of composition after cooling.
Step 3: after the simple and mechanical fragmentation of alloy cast ingot prepared by step 2, put into lower end and drive foraminate quartz ampoule, high-frequency induction heating, is evacuated to 10
-4pa, with after high-purity argon gas cleaning burner hearth, be filled with pressure reduction 0.09 ± 0.01MPa, (in stove, be wherein negative pressure-0.05 ± 0.005MPa, be made as+0.04 ± 0.005MPa of external pressure) high-purity argon gas and its protection under directly carry out copper mold casting, copper mold is placed among cavity, the sprue channel open of its copper mold is aimed at the opening of quartz ampoule, in the time that alloy is heated to complete melting state (being greater than 1300 DEG C) by induction melting, heat 30 seconds-1 minute, by insufflation switch, utilize draught head that alloy solution is injected to copper mold, wait for that alloy cooled and solidified can obtain and the corresponding magnet of copper mold size.
Step 4: after the simple and mechanical fragmentation of alloy cast ingot prepared by step 2, put into lower end and drive foraminate quartz ampoule, high-frequency induction heating, is evacuated to 10
-4pa, with after high-purity argon gas cleaning burner hearth, be filled with pressure reduction 0.09 ± 0.01MPa, (in stove, be wherein negative pressure-0.05 ± 0.005MPa, be made as+0.04 ± 0.005MPa of external pressure) high-purity argon gas, in the auxiliary direct casting device in the magnetic field of the Nd-Fe-Bo permanent magnet material shown in Fig. 1, carrying out copper mold casting is placed in the copper mold that meets this plant bulk in magnetic field of the goal, the sprue channel open of its copper mold is aimed at the opening of quartz ampoule, in the time that alloy is heated to complete melting state (being greater than 1300 DEG C) by induction melting, heat 30 seconds-1 minute, by insufflation switch, utilize draught head that alloy solution is injected to copper mold, wait for that alloy cooled and solidified can obtain and the corresponding magnet of copper mold size.
The sample length of the direct casting that step 4 obtains is greater than 6cm, and diameter is 2mm, and smooth surface has metallic luster, and closely knit continuously, and the technique of so simple one-step shaping is suitable for suitability for industrialized production, can reduce greatly production cost.
Casting copper mold entirety is placed among the gradient magnetostatic field that is parallel to casting direction, magnetic field is the trend of first increases and then decreases from the top to the bottom, wherein the position of magnetic field maximum can reach 1.2T, and following structure and performance test are all taken at this position, to reach maximum efficiency.
The sample that step 3 and four obtains proves that through X-ray diffraction it has all obtained the principal phase Nd of permanent magnet ndfeb
2fe
14b Hard Magnetic phase (as shown in Figure 4), but the serious broadening in its peak shows that Hard Magnetic phase crystal grain is in Nano grade, and forming nanometer Nd
2fe
14other nonmagnetic Nd when B phase, are formed
3al and NdAl
2phase, but can find out from the XRD figure of the sample that adds Yu Bujia magnetic field, magnetic field, its peak of sample that adds magnetic field is higher by force, illustrates and under the effect in magnetic field, has more Nd
2fe
14b crystal grain is separated out, the forming core of magnetic field strengthened this Hard Magnetic phase that hence one can see that.
With the M-H curve of the normal temperature of physical property measurement system (PPMS) measuring process three and step 4 gained sample, as shown in Figure 6, under magnetic field, casting is all greatly improved with the sample coercivity and the remanent magnetism that do not add magnetic field casting.Wherein Nd
45co
10fe
30al
10b
5the coercivity of the sample 598kA/m that never adds magnetic field rise to the 751kA/m that adds magnetic field, increased by 26%.And remanent magnetism has risen to 15.9emu/g from 12.6emu/g, increase by 26%.Under magnetic fields, the reason that magnetic sample performance rises is mainly in casting process, magnetic energy add the forming core energy that is conducive to reduce sample, so just greatly promoted Hard Magnetic Nd
2fe
14the forming core of B phase, because cooling velocity is very fast, has contained growing up of Hard Magnetic phase, so just in sample, has formed the more tiny uniform Hard Magnetic phase of crystal grain.Because the content of Nd in the composition of sample is 25%, this just inevitably forms more rich Nd phase at grain boundaries, causes the crystal grain of crystallization mutually separated by rich neodymium in addition, and exchange-coupling interaction is less each other, has ensured larger coercivity.
Embodiment 2
Step 1: by Nd
35co
20fe
30al
10b
5in the ratio batching of (atomic ratio); Sample gross weight is 10g, and wherein Nd, Co, Fe, Al, B are respectively 6.1369g, 1.4327g, 2.0367g, 0.3280,0.0657.
Step 2: the raw material that step 1 is prepared is put into electric arc furnaces, is evacuated to 10
?3pa; after cleaning burner hearth by high-purity argon, fill the high-purity argon gas a little less than 1 atmospheric pressure (about 0.1MPa), melt back 5 ?8 times under high-purity argon gas protection, smelting temperature is 1500 DEG C of 1300 ?; smelting time 2 ?3 minutes, obtain the uniform button-type alloy cast ingot of composition after cooling.
Step 3: after the simple and mechanical fragmentation of alloy cast ingot prepared by step 2, put into lower end and drive foraminate quartz ampoule, high-frequency induction heating, is evacuated to 10
-4pa, with after high-purity argon gas cleaning burner hearth, be filled with pressure reduction 0.09 ± 0.01MPa, (in stove, be wherein negative pressure-0.05 ± 0.005MPa, be made as+0.04 ± 0.005MPa of external pressure) high-purity argon gas and its protection under directly carry out copper mold casting, copper mold is placed among cavity, the sprue channel open of its copper mold is aimed at the opening of quartz ampoule, in the time that alloy is heated to complete melting state (being greater than 1300 DEG C) by induction melting, heat 30 seconds-1 minute, by insufflation switch, utilize draught head that alloy solution is injected to copper mold, wait for that alloy cooled and solidified can obtain and the corresponding magnet of copper mold size.
Step 4: after the simple and mechanical fragmentation of alloy cast ingot prepared by step 2, put into lower end and drive foraminate quartz ampoule, high-frequency induction heating, is evacuated to 10
-4pa, with after high-purity argon gas cleaning burner hearth, be filled with pressure reduction 0.09 ± 0.01MPa, (in stove, be wherein negative pressure-0.05 ± 0.005MPa, be made as+0.04 ± 0.005MPa of external pressure) high-purity argon gas, in the auxiliary direct casting device in the magnetic field of the Nd-Fe-Bo permanent magnet material shown in Fig. 1, carry out copper mold casting, the copper mold that meets this plant bulk is placed in magnetic field of the goal, the sprue channel open of its copper mold is aimed at the opening of quartz ampoule, in the time that alloy is heated to complete melting state (being greater than 1300 DEG C) by induction melting, heat 30 seconds-1 minute, by insufflation switch, utilize draught head that alloy solution is injected to copper mold, wait for that alloy cooled and solidified can obtain and the corresponding magnet of copper mold size.
The sample length of the direct casting that step 4 obtains is greater than 6cm, and diameter is 2mm, and smooth surface has metallic luster, and closely knit continuously, and the technique of so simple one-step shaping is suitable for suitability for industrialized production, can reduce greatly production cost.
The schematic diagram of the casting magnetic field-aided system using in step 4 as shown in Figure 1, casting copper mold entirety is placed among the gradient magnetostatic field that is parallel to casting direction, magnetic field is the trend of first increases and then decreases from the top to the bottom, wherein the position of magnetic field maximum can reach 1.2T, and following structure and performance test are all taken at this position, to reach maximum efficiency.
The sample that step 3 and step 4 obtain proves that through X-ray diffraction it has obtained nanometer Nd
2fe
14b phase (as shown in Figure 5), and be accompanied by non magnetic Nd partly
3al phase and NdAl
2phase.And the relative intensity at its peak of sample that casting obtains under magnetic field is greater than the sample that does not add magnetic field casting, illustrate that magnetic field is of value to Hard Magnetic Nd
2fe
14the forming core of B phase, contributes to sample to obtain more Magnetic Phase, to improve coercivity.
With the M-H curve of the normal temperature of physical property measurement system (PPMS) measuring process three and step 4 gained sample, as shown in Figure 7, under magnetic field, casting is all greatly improved with the sample coercivity and the remanent magnetism that do not add magnetic field casting.Wherein Nd
35co
20fe
30al
10b
5the coercivity of the sample 743kA/m that never adds magnetic field rise to the 969kA/m that adds magnetic field, increased by 30%.And remanent magnetism has risen to 19.5emu/g from 12.4emu/g, increase by 57%.Under magnetic fields, the reason that magnetic sample performance rises is mainly in casting process, magnetic energy add the forming core energy that is conducive to reduce sample, so just greatly promoted Hard Magnetic Nd
2fe
14the forming core of B phase, because cooling velocity is very fast, has contained growing up of Hard Magnetic phase, so just in sample, has formed the more tiny uniform Hard Magnetic phase of crystal grain.Because the content of Nd in the composition of sample is 25%, this just inevitably forms more rich Nd phase at grain boundaries, causes the crystal grain of crystallization mutually separated by rich neodymium in addition, and exchange-coupling interaction is less each other, has ensured larger coercivity.
Table 1Nd
(55-x)co
xfe
30al
10b
5coercivity (Hc) under series material normal temperature, remanent magnetism (Mr).
| Embodiment numbering | Atomic percent | Condition | Hc(kA/m) | Mr(emu/g) |
| 1 | Nd 45Co 10Fe 30Al 10B 5 | Do not add magnetic field | 598 | 12.6 |
| 1 | Nd 45Co 10Fe 30Al 10B 5 | Add magnetic field | 751 | 15.9 |
| 2 | Nd 35Co 20Fe 30Al 10B 5 | Do not add magnetic field | 743 | 12.4 |
| 2 | Nd 35Co 20Fe 30Al 10B 5 | Add magnetic field | 969 | 19.5 |
As can be seen from Table 1, Nd
(55 ?x)co
xfe
30al1
0b
5along with the raising of Co content, magnetic property all increases, and the interpolation of Co has increased the content of transition metal in alloy, so that form more Hard Magnetic Nd
2fe
14b phase.
Claims (5)
1. the auxiliary direct casting device in the magnetic field of Nd-Fe-Bo permanent magnet material, is characterized in that, comprises the first repulsive magnets, the second repulsive magnets, magnet guiding magnet, main magnet, regulation and control magnet, the first soft iron and the second soft iron; Described main magnet is the radial annular magnet magnetizing; It is axial discoidal the first repulsive magnets upwards that main magnet center below is provided with a magnetic direction, and the first repulsive magnets periphery is provided with the second repulsive magnets of the radial annular magnetizing; Main magnet upper end is provided with regulation and control magnet, and the magnetic direction of regulation and control magnet is for downward vertically; Above regulation and control magnet, be provided with the second soft iron, be provided with the first soft iron in the outside of regulation and control magnet, main magnet outside is provided with the magnet guiding magnet of an annular magnetizing vertically downwards; The cylindrical cavity diameter of movement of the second soft iron, regulation and control magnet, main magnet center is identical; In cavity structure, be target area from the second soft iron, regulation and control magnet to the long region of main magnet length 40mm-100mm; Target area obtains an axial magnetic field, and mean value size is 0.7T-1.2T.
2. the auxiliary direct casting device in the magnetic field of Nd-Fe-Bo permanent magnet material according to claim 1, is characterized in that, is provided with passage in the second repulsion magnet center.
3. the auxiliary direct casting device in the magnetic field of Nd-Fe-Bo permanent magnet material according to claim 1, it is characterized in that, the first repulsive magnets, magnet guiding magnet, main magnet and regulation and control magnet are the radial ring magnet that magnetizes, and are spliced into cirque structure by eight unidirectional arc pieces that magnetize.
4. the auxiliary direct casting device in the magnetic field of Nd-Fe-Bo permanent magnet material according to claim 1, is characterized in that the first repulsive magnets and the second repulsive magnets equal thickness.
5. the auxiliary direct casting device in the magnetic field of Nd-Fe-Bo permanent magnet material according to claim 1, is characterized in that, main magnet is identical with regulation and control magnet radial dimension.
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|---|---|---|---|
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|---|---|---|---|
| CN201420128689.1U CN203817347U (en) | 2014-03-20 | 2014-03-20 | Magnetic field assistance direct casting device for NdFeB (neodymium iron boron) permanent magnet material |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103894587A (en) * | 2014-03-20 | 2014-07-02 | 华南理工大学 | Neodymium-iron-boron permanent magnet material, preparation method and magnetic field auxiliary direct casting device |
| CN109532508A (en) * | 2018-11-21 | 2019-03-29 | 彭国洪 | A kind of U-shaped magnetic suspension mode of train |
-
2014
- 2014-03-20 CN CN201420128689.1U patent/CN203817347U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103894587A (en) * | 2014-03-20 | 2014-07-02 | 华南理工大学 | Neodymium-iron-boron permanent magnet material, preparation method and magnetic field auxiliary direct casting device |
| CN109532508A (en) * | 2018-11-21 | 2019-03-29 | 彭国洪 | A kind of U-shaped magnetic suspension mode of train |
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