CN102364617A - High-uniformity radial orientation neodymium iron boron permanent magnet ring and method for preparing same - Google Patents
High-uniformity radial orientation neodymium iron boron permanent magnet ring and method for preparing same Download PDFInfo
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- CN102364617A CN102364617A CN2011103793726A CN201110379372A CN102364617A CN 102364617 A CN102364617 A CN 102364617A CN 2011103793726 A CN2011103793726 A CN 2011103793726A CN 201110379372 A CN201110379372 A CN 201110379372A CN 102364617 A CN102364617 A CN 102364617A
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Abstract
The invention discloses a high-uniformity radial orientation neodymium iron boron permanent magnet ring and a method for preparing the same and relates to the technical field of rare-earth permanent magnet materials. The method comprises the following steps of: firstly, performing radial orientation magnetic field molding and secondary cold isostatic pressing on neodymium iron boron permanent magnet alloy material powder to prepare a radial orientation magnet ring green body of which the density is not less than 4.5 g/cm<3>; secondly, performing vacuum sintering and heat treatment to prepare a radial orientation magnet ring blank; and finally, machining and magnetizing to obtain the radial orientation neodymium iron boron permanent magnet ring, wherein a radial orientation magnetic field is generated by adopting a principle that like magnetic poles repel each other. The method is simple in operation and high in production efficiency. The radial orientation neodymium iron boron permanent magnet ring which is prepared by the method has the advantages of low blank deformation and cracking rate, high radial magnetic orientation degree, high uniformity of surface magnetic flux density and the like, and is applicable to batch production.
Description
Technical field:
The present invention relates to rare-earth permanent-magnet material technical field, be specifically related to a kind of high even radial orientation Nd-Fe-B permanent magnetic ring and preparation method.
Background technology:
The radial orientation permanent-magnet rare-earth ring has important application in the navigation of space flight, aviation, navigation and control system; As being used for the control system of artificial satellite, spaceship, large-scale naval vessels and strategic missile and the accurate device of guidance system, various magnetoes and gyroscope are also increasing to the demand of radial permanent-magnetic clamp simultaneously.
The radial orientation permanent-magnet rare-earth ring is mainly assembled through watt type magnet of some same orientations at present; Exist geometric center did not overlap, shows magnetic skewness (indentation) with magnetic field center shortcoming; Have a strong impact on the performance of device, also can cause the multiplication of a large amount of raw-material wastes and processing cost simultaneously.Whole radial orientation permanent-magnet rare-earth ring can overcome above-mentioned shortcoming; The patent and the technology of the whole radial orientation magnet ring of existing both at home and abroad a lot of preparations are the technology that patents such as 200810066269,200510086882,200580009032,01111509,200720170174 are announced like the patent No..However; Present whole radial orientation sintered NdFeB permanent magnet ring exists still that orientation is unsaturated, the magnet ring model is single, the high shortcoming of cracking rate in surface magnetic flux density lack of homogeneity, moulding and the sintering heat treatment process; Cause its manufacturing cost higher, be difficult to realize the marketization.
Summary of the invention:
The purpose of this invention is to provide a kind of high even radial orientation Nd-Fe-B permanent magnetic ring and preparation method; It is simple to operate, production efficiency is high; Adopt the radial orientation Nd-Fe-B permanent magnetic ring of this method preparation to have advantages such as blank distortion and little, radial magnetic aligning degree height of cracking rate, surface magnetic flux density good uniformity, be fit to batch process.
In order to solve the existing problem of background technology, preparation method of the present invention is: nd-fe-b permanent magnetic alloy material powder is processed density>=4.5g/cm through radially oriented pressing under magnetic field and secondary isostatic cool pressing
3Radial orientation magnet ring green compact, make radial orientation magnet ring blank through vacuum-sintering and heat treatment then, make radial orientation Nd-Fe-B permanent magnetic ring through machining and magnetization at last, wherein the principle that produces of radial orientation magnetic field is repelled each other for the magnetic pole same sex.
Concrete preparation technology of the present invention is: the preparation of (1) nd-fe-b permanent magnetic alloy material powder: the material powder that the nd-fe-b permanent magnetic alloy ingot casting is broken into particle mean size 3～5 μ m through grinding machine fragmentation and airflow milling; And in the material powder, add 0.1wt%～0.2wt% lubricant, wherein alloying component is PrNd26.5wt%～32.5wt%, Dy0.0wt%～5.0wt%, Nb0.0wt%～1.0wt%, Al0.0wt%～1.0wt%, Cu0.0wt%～0.2wt%, Co0.0wt%～3.0wt%, B1.0wt%～1.1wt%, Fe surplus.
(2) radial orientation pressing under magnetic field: radial orientation magnetic field is made up of the radial orientation mould of radial orientation molding device and integrated design; Molding device is to go up the magnetic field of electromagnet 1 and lower electromagnet 5 energising back generations its adjacent surface polarity identical (be all the N utmost point or be all the S utmost point); The magnetic line of force imports negative impression 3 filler region clusterings through last plug 2 and following plug 6, forms radial orientation magnetic field, forms the loop through former 4, radial orientation molding device magnetic conductive board and secondary yoke then; Nd-fe-b permanent magnetic alloy material powder is inserted former radial orientation magnetic field homogeneity range; With obtaining high radial magnetic aligning degree, through the two-way pressurization of molding device, make density>=4.0g/cm then
3Radial orientation magnet ring green compact.
(3) cold isostatic compaction: (aluminium core height is identical with the magnet ring height in radial orientation magnetic field first pressing magnet ring green compact, to fill in a special aluminium core; The aluminium core diameter is than the little 0.1mm of magnet ring green compact internal diameter); Carry out isostatic cool pressing after sealing through vacuum then, make density>=4.5g/cm
3Radial orientation magnet ring green compact.
(4) sintering and heat treatment: on smooth sintering boat, sprinkle the dry schmigel of one deck; To wait the radial orientation magnet ring green compact behind the static pressure to lie against on the schmigel then; In vacuum sintering furnace,, make radial orientation magnet ring blank through 850 ℃～950 ℃ tempering 1～3h and 500 ℃～650 ℃ tempering 3～5h then through 1130 ℃～1140 ℃ sintering 3～5h.
(5) machining: with processes to required product sizes such as the process of the radial orientation magnet ring blank behind sintering flat stone mill, inside and outside circle mill and Wire EDM.
(6) magnetization: the radial orientation magnet ring after the machining is put into the radial magnetizing clamp of the water-cooled that is connected with the pulse power; Magnetization designs different radial magnetizing clamps and can prepare one pole or multipole high evenly radial orientation Nd-Fe-B permanent magnetic ring to saturated under pulsed magnetic field.
The present invention has following beneficial effect: it is simple to operate, production efficiency is high; Adopt the radial orientation Nd-Fe-B permanent magnetic ring of this method preparation to have advantages such as blank distortion and little, radial magnetic aligning degree height of cracking rate, surface magnetic flux density good uniformity, be fit to batch process.
Description of drawings:
Fig. 1 is a process chart of the present invention,
Fig. 2 is the radial orientation magnetic field that the present invention adopted,
Fig. 3 is the radial orientation magnetic field magnetic line distribution schematic diagram that the present invention adopted.
Embodiment:
Referring to Fig. 1-3, the preparation method of this embodiment is: nd-fe-b permanent magnetic alloy material powder is processed density>=4.5g/cm through radially oriented pressing under magnetic field and secondary isostatic cool pressing
3Radial orientation magnet ring green compact, make radial orientation magnet ring blank through vacuum-sintering and heat treatment then, make radial orientation Nd-Fe-B permanent magnetic ring through machining and magnetization at last, wherein the principle that produces of radial orientation magnetic field is repelled each other for the magnetic pole same sex.
The concrete preparation technology of this embodiment is: the preparation of (1) nd-fe-b permanent magnetic alloy material powder: the material powder that the nd-fe-b permanent magnetic alloy ingot casting is broken into particle mean size 3～5 μ m through grinding machine fragmentation and airflow milling; And in the material powder, add 0.1wt%～0.2wt% lubricant, wherein alloying component is PrNd26.5wt%～32.5wt%, Dy0.0wt%～5.0wt%, Nb0.0wt%～1.0wt%, Al0.0wt%～1.0wt%, Cu0.0wt%～0.2wt%, Co0.0wt%～3.0wt%, B1.0wt%～1.1wt%, Fe surplus.
(2) radial orientation pressing under magnetic field: radial orientation magnetic field is made up of the radial orientation mould of radial orientation molding device and integrated design; Molding device is to go up the magnetic field of electromagnet 1 and lower electromagnet 5 energising back generations its adjacent surface polarity identical (be all the N utmost point or be all the S utmost point); The magnetic line of force imports negative impression 3 filler region clusterings through last plug 2 and following plug 6, forms radial orientation magnetic field, forms the loop through former 4, radial orientation molding device magnetic conductive board and secondary yoke then; Nd-fe-b permanent magnetic alloy material powder is inserted former radial orientation magnetic field homogeneity range; With obtaining high radial magnetic aligning degree, through the two-way pressurization of molding device, make density>=4.0g/cm then
3Radial orientation magnet ring green compact.
(3) cold isostatic compaction: (aluminium core height is identical with the magnet ring height in radial orientation magnetic field first pressing magnet ring green compact, to fill in a special aluminium core; The aluminium core diameter is than the little 0.1mm of magnet ring green compact internal diameter); Carry out isostatic cool pressing after sealing through vacuum then, make density>=4.5g/cm
3Radial orientation magnet ring green compact.
(4) sintering and heat treatment: on smooth sintering boat, sprinkle the dry schmigel of one deck; To wait the radial orientation magnet ring green compact behind the static pressure to lie against on the schmigel then; In vacuum sintering furnace,, make radial orientation magnet ring blank through 850 ℃～950 ℃ tempering 1～3h and 500 ℃～650 ℃ tempering 3～5h then through 1130 ℃～1140 ℃ sintering 3～5h.
(5) machining: with processes to required product sizes such as the process of the radial orientation magnet ring blank behind sintering flat stone mill, inside and outside circle mill and Wire EDM.
(6) magnetization: the radial orientation magnet ring after the machining is put into the radial magnetizing clamp of the water-cooled that is connected with the pulse power; Magnetization designs different radial magnetizing clamps and can prepare one pole or multipole high evenly radial orientation Nd-Fe-B permanent magnetic ring to saturated under pulsed magnetic field.
This embodiment is simple to operate, production efficiency is high, adopts the radial orientation Nd-Fe-B permanent magnetic ring of this method preparation to have advantages such as blank distortion and little, radial magnetic aligning degree height of cracking rate, surface magnetic flux density good uniformity, is fit to batch process.
Embodiment:
With composition is (PrNd)
27.2Dy
4.5Nb
0.5Al
0.5Cu
0.2Co
1.5B
1.04Fe
SurplusThe Nd Fe B alloys ingot casting be broken into the material powder that particle mean size is 4.6 μ m through grinding machine and airflow milling, oriented moulding in radial orientation magnetic field shown in Figure 2 then, making density is 4.02g/cm
3Radial orientation magnet ring green compact, and further its density is increased to 4.6g/cm through isostatic cool pressing
3The magnet ring green compact are 1138 ℃ of sintering 4h of warp in vacuum sintering furnace; 890 ℃ of tempering 1.5h and 510 ℃ of tempering 3.5h make radial orientation magnet ring blank, and the magnet ring blank makes the one pole radial orientation Nd-Fe-B permanent magnetic ring of external diameter 68.4mm, internal diameter 58.2mm, height 4mm through machining and the magnetization of pulse radial magnetic field.Adopt the test of AMT-4 type characteristic of magnetization automatic measuring instrument to accompany the normal temperature magnetic property that burns sample, the result is as shown in table 1; Adopt TYU-2000 teslameter test magnet ring surface magnetic flux density, the result is as shown in table 2.
Table 1 is accompanied and is burnt sample normal temperature magnetic property
Table 2 magnet ring surface magnetic flux density test result
| Maximum (Gs) | Minimum value (Gs) | Mean value (Gs) | Inhomogeneities (%) |
| 3881.84 | 3579.1 | 3736.458 | 1.24 |
Can know that by table 1 and table 2 the radial orientation Nd-Fe-B permanent magnetic ring of the present invention's preparation has advantages such as magnetic property is strong, surface magnetic flux density is even.
Claims (2)
1. one kind high even radial orientation Nd-Fe-B permanent magnetic ring and preparation method is characterized in that its preparation method is: nd-fe-b permanent magnetic alloy material powder is processed density>=4.5g/cm through radially oriented pressing under magnetic field and secondary isostatic cool pressing
3Radial orientation magnet ring green compact, make radial orientation magnet ring blank through vacuum-sintering and heat treatment then, make radial orientation Nd-Fe-B permanent magnetic ring through machining and magnetization at last, wherein the principle that produces of radial orientation magnetic field is repelled each other for the magnetic pole same sex.
2. a kind of high even radial orientation Nd-Fe-B permanent magnetic ring according to claim 1 and preparation method; It is characterized in that its concrete preparation technology is: the preparation of (1), nd-fe-b permanent magnetic alloy material powder: the material powder that the nd-fe-b permanent magnetic alloy ingot casting is broken into particle mean size 3～5 μ m through grinding machine fragmentation and airflow milling; And in the material powder, add 0.1wt%～0.2wt% lubricant, wherein alloying component is PrNd26.5wt%～32.5wt%, Dy0.0wt%～5.0wt%, Nb0.0wt%～1.0wt%, Al0.0wt%～1.0wt%, Cu0.0wt%～0.2wt%, Co0.0wt%～3.0wt%, B1.0wt%～1.1wt%, Fe surplus; (2), radial orientation pressing under magnetic field: radial orientation magnetic field is made up of the radial orientation mould of radial orientation molding device and integrated design; Molding device is that the magnetic field that produces after going up electromagnet (1) and lower electromagnet (5) being switched on is identical in its adjacent surface polarity; The magnetic line of force imports negative impression (3) filler region clustering through last plug (2) and following plug (6), forms radial orientation magnetic field, forms the loop through former (4), radial orientation molding device magnetic conductive board and secondary yoke then; Nd-fe-b permanent magnetic alloy material powder is inserted former radial orientation magnetic field homogeneity range; With obtaining high radial magnetic aligning degree, through the two-way pressurization of molding device, make density>=4.0g/cm then
3Radial orientation magnet ring green compact; (3), cold isostatic compaction: in radial orientation magnetic field first pressing magnet ring green compact, fill in a special aluminium core, carry out isostatic cool pressing after sealing through vacuum then, make density>=4.5g/cm
3Radial orientation magnet ring green compact; (4), sintering and heat treatment: on smooth sintering boat, sprinkle the dry schmigel of one deck; To wait the radial orientation magnet ring green compact behind the static pressure to lie against on the schmigel then; In vacuum sintering furnace,, make radial orientation magnet ring blank through 850 ℃～950 ℃ tempering 1～3h and 500 ℃～650 ℃ tempering 3～5h then through 1130 ℃～1140 ℃ sintering 3～5h; (5), machining: with processes to required product sizes such as the process of the radial orientation magnet ring blank behind sintering flat stone mill, inside and outside circle mill and Wire EDM; (6), magnetization: the radial orientation magnet ring after the machining is put into the radial magnetizing clamp of the water-cooled that is connected with the pulse power; Magnetization designs different radial magnetizing clamps and can prepare one pole or multipole high evenly radial orientation Nd-Fe-B permanent magnetic ring to saturated under pulsed magnetic field.
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| CN103042211A (en) * | 2012-07-27 | 2013-04-17 | 宁波市鄞州泰源磁业有限公司 | Die for radially-oriented sintered NdFeB magnetic ring and production process thereof |
| CN103240416A (en) * | 2013-05-03 | 2013-08-14 | 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 |
| CN103805825A (en) * | 2012-11-08 | 2014-05-21 | 沈阳中北真空科技有限公司 | Vacuum-induction smelting and rapid hardening equipment for rare-earth permanent-magnet alloy |
| CN103846428A (en) * | 2014-02-28 | 2014-06-11 | 深圳市磁研科技有限公司 | Near-net forming processing equipment for rare earth permanent magnetic material |
| CN103971917A (en) * | 2014-05-10 | 2014-08-06 | 董中天 | Forming method and device of sintered Nd-Fe-B radiation magnetic ring |
| CN104157387A (en) * | 2014-08-18 | 2014-11-19 | 钢铁研究总院 | Permanent magnetic ring component and manufacturing method thereof |
| CN104347261A (en) * | 2014-10-10 | 2015-02-11 | 宁波金鸡强磁股份有限公司 | Orientation device and orientation method for radiation ring magnet |
| CN104907558A (en) * | 2015-06-28 | 2015-09-16 | 浙江康盈磁业有限公司 | A rare earth permanent magnetic material preparing method |
| CN106077635A (en) * | 2016-06-30 | 2016-11-09 | 成都八九九科技有限公司 | A kind of equipment improving the rare earth permanent-magnetic material pressing under magnetic field degree of orientation and the manufacture method of permanent magnet material |
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| CN109950039A (en) * | 2019-04-22 | 2019-06-28 | 宁德市星宇科技有限公司 | A kind of molding machine and radiation ring preparation method of sintered NdFeB radiation ring |
| CN110400669A (en) * | 2019-06-28 | 2019-11-01 | 宁波合盛磁业有限公司 | A kind of high performance neodymium iron boron of low heavy rare earth and preparation method thereof |
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| CN116978657A (en) * | 2023-09-22 | 2023-10-31 | 江西金力永磁科技股份有限公司 | Multipolar radial oriented sintered NdFeB circular ring and preparation method thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1039502A (en) * | 1988-07-16 | 1990-02-07 | 冶金工业部钢铁研究总院 | Radial orientation neodymium-iron-B permanent-magnet ring and manufacture method thereof |
| CN1122944A (en) * | 1994-11-11 | 1996-05-22 | 冶金工业部包头稀土研究院 | 2-17 type rare-earth permanent-magnetic ring and its fabrication method |
| CN1770338A (en) * | 2005-09-08 | 2006-05-10 | 浙江升华强磁材料有限公司 | Forming process for radially oriented magnetic ring |
| CN1794385A (en) * | 2005-11-16 | 2006-06-28 | 北京科技大学 | Preparation method of radiation orientation integral permanent magnetic ring |
| CN102087917A (en) * | 2009-12-02 | 2011-06-08 | 北京中科三环高技术股份有限公司 | Preparation method and pressing device for radiation-oriented magnet ring or multipolar magnet ring |
-
2011
- 2011-11-25 CN CN2011103793726A patent/CN102364617A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1039502A (en) * | 1988-07-16 | 1990-02-07 | 冶金工业部钢铁研究总院 | Radial orientation neodymium-iron-B permanent-magnet ring and manufacture method thereof |
| CN1122944A (en) * | 1994-11-11 | 1996-05-22 | 冶金工业部包头稀土研究院 | 2-17 type rare-earth permanent-magnetic ring and its fabrication method |
| CN1770338A (en) * | 2005-09-08 | 2006-05-10 | 浙江升华强磁材料有限公司 | Forming process for radially oriented magnetic ring |
| CN1794385A (en) * | 2005-11-16 | 2006-06-28 | 北京科技大学 | Preparation method of radiation orientation integral permanent magnetic ring |
| CN102087917A (en) * | 2009-12-02 | 2011-06-08 | 北京中科三环高技术股份有限公司 | Preparation method and pressing device for radiation-oriented magnet ring or multipolar magnet ring |
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| CN103042211A (en) * | 2012-07-27 | 2013-04-17 | 宁波市鄞州泰源磁业有限公司 | Die for radially-oriented sintered NdFeB magnetic ring and production process thereof |
| CN103042211B (en) * | 2012-07-27 | 2015-02-11 | 王秋安 | Die for radially-oriented sintered NdFeB magnetic ring and production process thereof |
| CN103805825A (en) * | 2012-11-08 | 2014-05-21 | 沈阳中北真空科技有限公司 | Vacuum-induction smelting and rapid hardening equipment for rare-earth permanent-magnet alloy |
| CN103240416A (en) * | 2013-05-03 | 2013-08-14 | 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 |
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| CN103846428A (en) * | 2014-02-28 | 2014-06-11 | 深圳市磁研科技有限公司 | Near-net forming processing equipment for rare earth permanent magnetic material |
| CN103846428B (en) * | 2014-02-28 | 2016-04-20 | 深圳市磁研科技有限公司 | A kind of rare earth permanent-magnetic material near-net-shape process equipment |
| CN103971917A (en) * | 2014-05-10 | 2014-08-06 | 董中天 | Forming method and device of sintered Nd-Fe-B radiation magnetic ring |
| CN104157387A (en) * | 2014-08-18 | 2014-11-19 | 钢铁研究总院 | Permanent magnetic ring component and manufacturing method thereof |
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| CN104347261A (en) * | 2014-10-10 | 2015-02-11 | 宁波金鸡强磁股份有限公司 | Orientation device and orientation method for radiation ring magnet |
| CN104907558A (en) * | 2015-06-28 | 2015-09-16 | 浙江康盈磁业有限公司 | A rare earth permanent magnetic material preparing method |
| CN106077635A (en) * | 2016-06-30 | 2016-11-09 | 成都八九九科技有限公司 | A kind of equipment improving the rare earth permanent-magnetic material pressing under magnetic field degree of orientation and the manufacture method of permanent magnet material |
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| CN107424721A (en) * | 2017-09-22 | 2017-12-01 | 上海杰灵磁性器材有限公司 | A kind of pipeline demagnetizer and its application based on permanent-magnet structure |
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| CN108597847A (en) * | 2018-06-08 | 2018-09-28 | 钢铁研究总院 | A kind of manufacturing method of latching valve locking magnet ring and its locking magnet ring of manufacture |
| CN109950039A (en) * | 2019-04-22 | 2019-06-28 | 宁德市星宇科技有限公司 | A kind of molding machine and radiation ring preparation method of sintered NdFeB radiation ring |
| CN109950039B (en) * | 2019-04-22 | 2023-06-23 | 宁德市星宇科技有限公司 | Forming device of sintered NdFeB radiation ring and radiation ring preparation method |
| CN110400669A (en) * | 2019-06-28 | 2019-11-01 | 宁波合盛磁业有限公司 | A kind of high performance neodymium iron boron of low heavy rare earth and preparation method thereof |
| CN112310589A (en) * | 2020-12-16 | 2021-02-02 | 中国电子科技集团公司第九研究所 | Ware is divided to outer merit of aerospace cabin |
| CN113410039A (en) * | 2021-06-18 | 2021-09-17 | 中国电子科技集团公司第九研究所 | Preparation method of multi-pole magnetic ring based on HALBACH structure |
| CN116978657A (en) * | 2023-09-22 | 2023-10-31 | 江西金力永磁科技股份有限公司 | Multipolar radial oriented sintered NdFeB circular ring and preparation method thereof |
| CN116978657B (en) * | 2023-09-22 | 2024-03-08 | 江西金力永磁科技股份有限公司 | Multipolar radial oriented sintered NdFeB circular ring and preparation method thereof |
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Application publication date: 20120229 |