CN102360914B - Method for manufacturing annular magnet with radial magnetic orientation - Google Patents
Method for manufacturing annular magnet with radial magnetic orientation Download PDFInfo
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- CN102360914B CN102360914B CN 201110227854 CN201110227854A CN102360914B CN 102360914 B CN102360914 B CN 102360914B CN 201110227854 CN201110227854 CN 201110227854 CN 201110227854 A CN201110227854 A CN 201110227854A CN 102360914 B CN102360914 B CN 102360914B
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- 230000005291 magnetic effect Effects 0.000 title claims abstract description 129
- 238000000034 method Methods 0.000 title claims abstract description 39
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 18
- 230000005855 radiation Effects 0.000 claims abstract description 13
- 238000002360 preparation method Methods 0.000 claims abstract description 8
- 239000000843 powder Substances 0.000 claims abstract description 7
- 238000005245 sintering Methods 0.000 claims abstract description 5
- 239000000463 material Substances 0.000 claims abstract description 4
- 229920006395 saturated elastomer Polymers 0.000 claims abstract description 3
- 239000000696 magnetic material Substances 0.000 claims description 6
- 229910001172 neodymium magnet Inorganic materials 0.000 claims description 6
- 229910000938 samarium–cobalt magnet Inorganic materials 0.000 claims description 6
- KPLQYGBQNPPQGA-UHFFFAOYSA-N cobalt samarium Chemical group [Co].[Sm] KPLQYGBQNPPQGA-UHFFFAOYSA-N 0.000 claims description 4
- 230000005404 monopole Effects 0.000 claims description 3
- 229910000859 α-Fe Inorganic materials 0.000 claims description 2
- 239000006247 magnetic powder Substances 0.000 abstract 2
- 238000003754 machining Methods 0.000 abstract 1
- 230000005389 magnetism Effects 0.000 abstract 1
- 238000005275 alloying Methods 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 229910052761 rare earth metal Inorganic materials 0.000 description 3
- 150000002910 rare earth metals Chemical class 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- QJVKUMXDEUEQLH-UHFFFAOYSA-N [B].[Fe].[Nd] Chemical compound [B].[Fe].[Nd] QJVKUMXDEUEQLH-UHFFFAOYSA-N 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 206010044565 Tremor Diseases 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
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Abstract
The invention provides a method for manufacturing an annular magnet with radial magnetic orientation. The preparation process for the annular magnet comprises the steps of preparing materials, preparing powder, orientating and compressing, sintering and machining. The method is characterized in that: during orientating and compressing, magnetic powder in an annular die cavity (11) is orientated by adopting a plane radial magnetic field which is vertical to the axial direction of the annular die cavity (11) and takes the circle center of the cross section of the annular die cavity (11) as a center; an inner magnetic pole (12) for conducting magnetism is arranged in the annular die cavity (11) and in the center of the radial magnetic field; the radial magnetic field is generated by a device (10) for providing the radial magnetic field; the device (10) for providing the radial magnetic field consists of needle-shaped magnetic-conductive bars (13) which are arranged on one plane and tightly arranged around the annular die cavity radially; the needle-shaped magnetic-conductive bars (13) are used for guiding an external magnetic field to form the radial magnetic field; in the orientating process, the radial magnetic field does axial reciprocating motion along the annular die cavity (11) so as to orientate the magnetic powder in the annular die cavity (11); and after the magnet is magnetized through single-pole radiation and is in a saturated state, on an external cylindrical surface of the magnet, the surface field fluctuation in the circumferential direction is less than 7 percent and the surface field fluctuation in the axial direction is less than 7 percent. By the method, uniformity of the magnetic performance of the magnet along the circumferential direction can be guaranteed; uniformity of the magnetic performance of the magnet along the axial direction can be guaranteed; and the magnet can be magnetized according to requirements to form 2n-pole radiating rings.
Description
Technical field
The present invention relates to a kind of method of making permanent magnet, relating in particular to and making magnetic aligning is the method for radial annular magnet
Technical background
Extensive use along with the magnetic force technology, in order to reach energy-conservation purpose, the magnetic force technology is applied to as magnetically prestressed bearing, fully permanent magnet suspension horizontal motor, magnetic-suspension high-speed centrifuge etc., and the permanent magnetic material that needs requires annular and often with radial magnetic field.
Open day is that the Chinese patent literature CN101794656A of on 08 04th, 2010 discloses a kind of knockdown radiation ring magnet, jointly forms the integral type magnet ring structure by outer retaining ring body and several piece arcuation magnet steel.The radiation ring magnet of this structure has following shortcoming: be not 1) one-shot forming, need first to make separately the arcuation magnet steel, and then be assembled into; 2) magnetic aligning of each piece arcuation magnet steel is not the strict sensing center of circle; 3) be difficult to guarantee the radiation ring on the whole magnetic property evenly; 4) number of magnetic poles is fixed, and can not be magnetized into the radiation ring of the 2n utmost point on demand.
The Chinese patent literature CN1420504A that open day is on May 28th, 2003 discloses a kind of radial anisotropic sintered magnet of global formation, this magnet along with the part of the direction orientation that radially becomes 30 degree angles or larger angle to incline to tremble, this part in magnet shared volume ratio 2% or larger and 50% or less scope in; And radial oriented or along the part with the direction orientation that tilts with the angles that radially become less than 30 degree, this part accounts for the residual volume of magnet cumulative volume.This magnet is by following defective: can not guarantee magnet radial magnetic aligning on the whole, thereby cause the uniformity of magnet magnetic property along the circumferential direction not guarantee.
The day for announcing is the preparation method that the Chinese patent literature CN100407347C on July 30th, 2008 discloses a kind of radiation orientation integral permanent magnetic ring: adopt the magnetic field of two homopolarities to repel, produce radial magnetic field, magnetic is orientated.Yet the radial magnetic field that the method produces is the strongest at the middle part of circular or cylindrical magnet, two ends a little less than, the radial annulus or the cylindrical magnet that namely adopt the method to make, the middle part degree of orientation is better vertically, and the two ends degree of orientation is relatively poor, thus the table field that makes magnet skewness vertically.
Summary of the invention
The objective of the invention is, a kind of magnetic aligning of making radiation direction method of annular magnet adequately and uniformly is provided, can guarantee the uniformity of the magnetic property that magnet is along the circumferential direction gone up, also can guarantee the uniformity of magnetic property vertically, and can be magnetized as required, form the radiation ring of the 2n utmost point.
In order to estimate uniformity that magnetic aligning is the magnetic property along the circumferential direction gone up of radial annular magnet and the uniformity of magnetic property vertically, the present invention adopt with annular magnet carry out monopole radiation magnetize saturated after (the outer S of the outer N of interior S or interior N), measure respectively that along the circumferential direction table field wave is moving and table field wave vertically is moving.
The table field wave of circumferencial direction is moving=the table field minimum value of the table of the table field maximum-circumferencial direction of circumferencial direction (field minimum value)/circumferencial direction.
Axial table field wave is moving=the table field minimum value of the table of the axial table field maximum-axial (field minimum value)/circumferencial direction.
in order to realize purpose of the present invention, the invention provides a kind of method that magnetic aligning is radial annular magnet of making, the preparation process of described annular magnet comprises batching, powder process, orientation die mould, sintering, machine work, it is characterized in that: when the orientation die mould, employing is axial perpendicular to annular die cavity 11, and the planar radiation shape magnetic field centered by the center of circle of annular die cavity 11 cross sections, magnetic in annular die cavity 11 is orientated, be provided with the internal magnetic pole 12 for magnetic conduction in described annular die cavity 11, described internal magnetic pole 12 is arranged on the center in radial magnetic field, described radial magnetic field produces by the device 10 that radial magnetic field is provided, the described device 10 in radial magnetic field that provides is made of the needle-like magnetic conductive rod 13 of closely arranging around annular die cavity radially that arranges in a plane, described needle-like magnetic conductive rod 13 is used for the guiding externally-applied magnetic field and forms radial magnetic field, in orientation process, radial magnetic field is along the axially reciprocating of annular die cavity 11, thereby the magnetic in annular die cavity 11 is orientated, and, described magnet is carried out after monopole radiation magnetizes, on the external cylindrical surface of magnet, the table field wave of circumferencial direction is moving lower than 7%, axial table field wave is moving lower than 7%.
The table field wave of circumferencial direction is moving=the table field minimum value of the table of the table field maximum-circumferencial direction of circumferencial direction (field minimum value)/circumferencial direction,
Axial table field wave is moving=the table field minimum value of the table of the axial table field maximum-axial (field minimum value)/circumferencial direction.
Above-mentioned magnetic aligning is radial annular magnet, and further preferred, magnet is the Nd-Fe-B series rare earth permanent-magnetic material, or samarium-cobalt permanent-magnetic material, or binding electromagnetic material.
Above-mentioned magnetic aligning is radial annular magnet, and is further preferred, and table field wave along the circumferential direction is moving lower than 5%, and table field wave vertically is moving lower than 5%.
Further preferred, table field wave along the circumferential direction is moving lower than 4%, and table field wave vertically is moving lower than 4%.
Further preferred, table field wave along the circumferential direction is moving lower than 3%, and table field wave vertically is moving lower than 3%.
Preferably, the described device in radial magnetic field that provides is along die cavity setting at least 2 covers.
Preferably, described externally-applied magnetic field is provided by the hot-wire coil 14 that is wrapped on the needle-like magnetic conductive rod, and perhaps, described externally-applied magnetic field is provided by permanent magnet or electromagnet.
Description of drawings
Fig. 1: equipment of the present invention is along the axial schematic diagram of die cavity;
Fig. 2: needle-like magnetic conductive rod schematic diagram in the present invention;
Fig. 3: equipment of the present invention is along die cavity schematic diagram radially;
Reference numeral:
10: the device that radial magnetic field is provided; 11: annular die cavity; 12: internal magnetic pole; 13: the needle-like magnetic conductive rod; 14: be wrapped in the coil on the needle-like magnetic conductive rod; 15: pressure head; 16: moving component; 17: cam mechanism.
Embodiment
The below is described further the specific embodiment of the present invention.
1-3 is described the orientation tamping plant that the present invention adopts by reference to the accompanying drawings.
The orientation tamping plant that the present invention adopts, comprise: pressure head 15, the annular die cavity 11 that is used for accommodating magnetic, it is characterized in that: also comprise the device that radial magnetic field is provided 10 around the die cavity setting, and moving component 16, described moving component 16 the described device 10 in radial magnetic field that provides is provided moves back and forth along annular die cavity 11, is provided with the internal magnetic pole 12 for magnetic conduction in die cavity 11, and described internal magnetic pole 12 is arranged on the center in radial magnetic field.
Particularly, the described device 10 in radial magnetic field that provides is made of the needle-like magnetic conductive rod 13 of closely arranging radially that arranges in a plane, and described needle-like magnetic conductive rod 13 is used for the guiding externally-applied magnetic field and forms radial magnetic field.
Particularly, described externally-applied magnetic field is provided by the hot-wire coil 14 that is wrapped on the needle-like magnetic conductive rod, and perhaps, described externally-applied magnetic field is provided by permanent magnet or electromagnet.
Particularly, the described device that radial magnetic field is provided arranges 2 covers or more than 2 covers along die cavity.
Preferably, the diameter of the close die cavity end of described needle-like magnetic conductive rod is less than the diameter of the other end.
Particularly, described moving component is by slider-crank mechanism or cam mechanism.
Embodiment 1
Making magnetic aligning is the method for radial Nd-Fe-B series rare-earth permanent magnet.
The alloying component of the Nd-Fe-B series rare-earth permanent magnet that adopts is: Nd
13.5Dy
0.5B
5.8Al
0.7Cu
0.05Fe
Surplus(atomic fraction %).
By alloying component batching, then to carry out melting and obtain ingot casting, powder process obtains average grain diameter at the magnetic of 3.5 microns.With the magnetic annular die cavity 11 of packing into, apply radial magnetic field, radial magnetic field is moved along the axial reciprocating of annular die cavity 11, after the magnetic orientation was abundant, 15 pairs of magnetics of pressure head were exerted pressure, after moulding, take out annular blank, blank is carried out sintering, machine work, and to obtain external diameter and be 33mm, internal diameter be 25mm, highly for the magnetic aligning of 3.4mm is 10 of radial annular magnet, and code name is respectively 1-1 to 1-10.
The magnet one pole is magnetized, and interior S is N (the outer S of N perhaps) outward, measures respectively magnet table field maximum and minimum value in axial direction to be along the circumferential direction table field maximum and minimum value.As shown in table 1
Table 1 neodymium-iron-boron body surface field wave moves data
Embodiment 2
Making magnetic aligning is the method for radial samarium cobalt permanent magnet body.
The alloying component of the samarium-cobalt permanent-magnetic material that adopts is: Sm (Co
0.69Fe
0.2Cu
0.1Zr
0.01)
7.2(atomic fraction %).
By alloying component batching, then to carry out melting and obtain ingot casting, powder process obtains average grain diameter at the magnetic of 5 microns.With the magnetic annular die cavity 11 of packing into, apply radial magnetic field, radial magnetic field is moved along the axial reciprocating of annular die cavity 11, after the magnetic orientation was abundant, 15 pairs of magnetics of pressure head were exerted pressure, after moulding, take out annular blank, blank is carried out sintering, machine work, and to obtain external diameter and be 36mm, internal diameter be 31mm, highly for the magnetic aligning of 5mm is 10 of radial annular magnet, and code name is respectively 2-1 to 2-10.
The magnet one pole is magnetized, and interior S is N (the outer S of N perhaps) outward, measures respectively magnet table field maximum and minimum value in axial direction to be along the circumferential direction table field maximum and minimum value.As shown in table 2
Table 2 samarium cobalt magnet table field wave moves data
Comparative Examples 1
Adopt alloying component and powder in embodiment 1, the preparation method adopts the method for the CN100407347C of background technology, the preparation external diameter be 33mm, internal diameter be 25mm, highly for the magnetic aligning of 3.4mm is 10 of radial annular magnet, code name is respectively 3-1 to 3-10.
The magnet one pole is magnetized, and interior S is N (the outer S of N perhaps) outward, measure respectively magnet table field maximum and minimum value in axial direction to be, and along the circumferential direction table field maximum and minimum value, as shown in table 3.
Table 3 neodymium-iron-boron body surface field wave moves data
Comparative Examples 2
Adopt alloying component and powder in embodiment 2, the preparation method adopts the method for the CN100407347C of background technology, the preparation external diameter be 36mm, internal diameter be 31mm, highly for the magnetic aligning of 5mm is 10 of radial annular magnet, code name is respectively 4-1 to 4-10.
The magnet one pole is magnetized, and interior S is N (the outer S of N perhaps) outward, measures respectively magnet table field maximum and minimum value in axial direction to be along the circumferential direction table field maximum and minimum value.As shown in table 4
Table 4 samarium cobalt magnet table field wave moves data
by embodiment 1 and Comparative Examples 1, the contrast of embodiment 2 and Comparative Examples 2, can find, the magnetic aligning that adopts method manufacturing of the present invention is that the table field wave of the circumferencial direction of radial annular magnet moves lower than 7%, axial table field wave is moving lower than 7%, and the table field wave that the magnetic aligning that adopts the method manufacturing in patent CN100407347C is the circumferencial direction of radial annular magnet moves higher than 7%, axial table field wave is moving higher than 7%, this just manufacture method of the present invention with respect to manufacture method improvements of the prior art, can improve the uniformity of circumferencial direction that magnetic aligning is radial annular magnet and axial table field.
What should be noted that is: it is radial ring-type bonded permanent magnet or dry method opposite sex ferrite that manufacture method of the present invention can also be made magnetic aligning, its production process is as the common practise of this area, repeat no more, what only need to change is, when the orientation die mould, adopt method for alignment of the present invention that magnet is orientated to magnet.
Claims (10)
1. make the method that magnetic aligning is radial annular magnet for one kind, the preparation process of described annular magnet comprises batching, powder process, orientation die mould, sintering, machine work, it is characterized in that: when the orientation die mould, employing is axial perpendicular to annular die cavity (11), and the planar radiation shape magnetic field centered by the center of circle of annular die cavity (11) cross section, magnetic in annular die cavity (11) is orientated, be provided with the internal magnetic pole (12) for magnetic conduction in described annular die cavity (11), described internal magnetic pole (12) is arranged on the center in radial magnetic field, described radial magnetic field produces by the device (10) that radial magnetic field is provided, the described device (10) in radial magnetic field that provides is made of the needle-like magnetic conductive rod (13) of closely arranging around annular die cavity radially that arranges in a plane, described needle-like magnetic conductive rod (13) is used for the guiding externally-applied magnetic field and forms radial magnetic field,
In orientation process, radial magnetic field is along the axially reciprocating of annular die cavity (11), thereby the magnetic in annular die cavity (11) is orientated,
And, to described magnet carry out monopole radiation magnetize saturated after, on the external cylindrical surface of magnet, the table field wave of circumferencial direction is moving lower than 7%, axial table field wave is moving lower than 7%.
2. the manufacturing magnetic aligning according to claim 1 method that is radial annular magnet, is characterized in that described magnet is the Nd-Fe-B series permanent magnetic material.
3. the manufacturing magnetic aligning according to claim 1 method that is radial annular magnet, is characterized in that described magnet is samarium-cobalt permanent-magnetic material.
4. the manufacturing magnetic aligning according to claim 1 method that is radial annular magnet, is characterized in that described magnet is binding electromagnetic material.
5. the manufacturing magnetic aligning according to claim 1 method that is radial annular magnet, is characterized in that described magnet is dry method opposite sex Ferrite Material.
6. the manufacturing magnetic aligning according to claim 1 method that is radial annular magnet, it is characterized in that table field wave along the circumferential direction is moving lower than 5%, or table field wave vertically is moving lower than 5%
7. the manufacturing magnetic aligning according to claim 1 method that is radial annular magnet, it is characterized in that table field wave along the circumferential direction is moving lower than 4%, or table field wave vertically is moving lower than 4%
8. the manufacturing magnetic aligning according to claim 1 method that is radial annular magnet, it is characterized in that table field wave along the circumferential direction is moving lower than 3%, or table field wave vertically is moving lower than 3%
9. according to claim 1-8 the arbitrary described manufacturing magnetic aligning method that is radial annular magnet is more than is characterized in that the described device that radial magnetic field is provided axially arranges 2 covers along die cavity.
10. according to claim 1-8 the arbitrary described manufacturing magnetic aligning method that is radial annular magnet, it is characterized in that described externally-applied magnetic field is provided by the hot-wire coil (14) that is wrapped on the needle-like magnetic conductive rod, perhaps, described externally-applied magnetic field is provided by permanent magnet or electromagnet.
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| CN 201110227854 CN102360914B (en) | 2011-08-10 | 2011-08-10 | Method for manufacturing annular magnet with radial magnetic orientation |
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| CN 201110227854 CN102360914B (en) | 2011-08-10 | 2011-08-10 | Method for manufacturing annular magnet with radial magnetic orientation |
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| CN102360914B true CN102360914B (en) | 2013-06-05 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US10852367B2 (en) | 2007-05-30 | 2020-12-01 | Infineon Technologies Ag | Magnetic-field sensor with a back-bias magnet |
| CN103310970B (en) * | 2012-03-09 | 2016-01-06 | 江苏东瑞磁材科技有限公司 | The preparation method of permanent-magnetic ring of radial orientation and radial orientation device thereof |
| CN103123864B (en) * | 2013-02-26 | 2016-01-06 | 江苏东瑞磁材科技有限公司 | A kind of method and manufacturing installation thereof preparing radial permanent magnetic ring |
| CN103240416B (en) * | 2013-05-03 | 2015-01-14 | 浙江中元磁业股份有限公司 | Method and mould for manufacturing NeFeB (Neodymium iron boron) radiation-orientated ring magnet |
| DE102016009010A1 (en) * | 2015-07-29 | 2017-02-02 | Infineon Technologies Ag | magnetic field sensor |
| CN109551714A (en) * | 2018-12-17 | 2019-04-02 | 横店集团东磁股份有限公司 | A kind of injection mold and injection moulding process being used to prepare more oriented anisotropic modeling magnetic |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2007035786A (en) * | 2005-07-25 | 2007-02-08 | Daido Electronics Co Ltd | Radial orientation magnetic field forming apparatus |
| CN100407347C (en) * | 2005-11-16 | 2008-07-30 | 北京科技大学 | Preparation method of radiation orientation integral permanent magnetic ring |
| CN101256898B (en) * | 2008-03-27 | 2011-06-29 | 成问好 | Method and apparatus for forming of radiation orientating round ring-shaped magnetic body |
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