CN102087917B - Preparation method and pressing device for radiation-oriented magnet ring or multipolar magnet ring - Google Patents
Preparation method and pressing device for radiation-oriented magnet ring or multipolar magnet ring Download PDFInfo
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- CN102087917B CN102087917B CN200910241438.8A CN200910241438A CN102087917B CN 102087917 B CN102087917 B CN 102087917B CN 200910241438 A CN200910241438 A CN 200910241438A CN 102087917 B CN102087917 B CN 102087917B
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Abstract
The invention provides a preparation method for a radiation-oriented magnet ring or a multipolar magnet ring, which comprises the following operation steps of: preparing an alloy ingot, cracking the alloy ingot, pressing under a radiation-oriented magnet field, sintering the magnet ring and subsequently machining and is characterized in that a powder pre-orientation step is also arranged before the step of pressing under the radiation-oriented magnet field, powder is first filled in a die cavity of a forming press, and pre-orientation operation is then carried out on the powder. Before the step of sintering the magnet ring, a step of preprocessing a blank is also arranged. Preprocessing operation is carried out on the blank magnet ring under protective atmosphere. The orientation degree of the magnet ring can be further improved under the condition that the die structure is not changed, so that the purpose for improving the magnetic performance of the magnet ring is achieved. Meanwhile, sintering crack problems resulting from nonuniform contraction caused by the internal stress of the magnet ring in the sintering process can be effectively solved, and the sintering finished product rate of the magnet ring can be obviously improved.
Description
Technical field
The present invention relates to preparation method and the press device thereof of a kind of radially oriented magnetic ring or multi-pole magnet-ring, particularly preparation method and the press device thereof of a kind of radially oriented rare earth permanent magnet magnet ring or multipole rare earth permanent magnet magnet ring.
In this manual, term " radially oriented magnetic ring " refer to the direction of magnetization along ring radially radially, inside and outside magnet ring, both sides form respectively the N utmost point and the S utmost point;
Term " radial multi-pole ring " is that radial orientation ring is carried out to special burst process, makes the inside and outside both sides of magnet ring form the multipair utmost point of the N utmost point and the S utmost point.
Background technology
Preparing in the prior art of radially oriented magnetic ring and multi-pole magnet-ring, generally all utilize magnetic pole principle of same-sex repulsion to form radiation field in moulding press dies cavity, so that magnet ring is orientated, thereby prepare radially oriented magnetic ring and multi-pole magnet-ring.
But the radially oriented magnetic field intensity of this method is less, the magnet ring degree of orientation is undesirable, has finally affected the magnetic property of magnet ring.The method solving is improved alignment magnetic field and changes mould structure etc., as taked the mode of multipole magnetization in Chinese patent No.ZL01226281.1, is characterized in obtaining stronger orientation field.And in order to improve the shape after magnetic property and the magnet ring sintering of magnet ring, Chinese patent No.ZL02107300.7 and No.ZL03107412.X disclose adopt the mode of feeding in batches and adopt octagon as the inwall of mold cavity block and the shape of plug the method to prevent that magnet from rotating.But these methods are not only time-consuming but also expensive, and radially oriented magnetic ring is easy to cracking in the process of sintering.
Summary of the invention
The object of this invention is to provide preparation method and the press device thereof of a kind of radially oriented magnetic ring or multi-pole magnet-ring, it can further improve the degree of orientation of magnet ring under the prerequisite that does not change mould structure, thereby reach the object that improves magnet ring magnetic property, the sintering problem of Cracking that contraction that sintering process middle magnetic ring causes due to internal stress is inhomogeneous and then cause can be effectively solved simultaneously, the sintering finished rate of magnet ring can be significantly improved.
For this reason, according to an aspect of the present invention, the preparation method of a kind of radially oriented magnetic ring or multi-pole magnet-ring is provided, comprise and prepare compacting, magnet ring sintering, follow-up machine operations step under alloy cast ingot, alloy cast ingot fragmentation, radially oriented magnetic field, it is characterized in that, under radially oriented magnetic field, before pressing step, be also provided with powder preorientation step, first powder filling arrived in the mold cavity of moulding press, and then powder is carried out to preorientation operation.
Preferably, before magnet ring sintering step, be also provided with blank pre-treatment step, blank magnet ring carries out pretreatment operation under protective atmosphere.
Preferably, yoke is along the circumferential direction divided into four movably yoke parts, respectively comprises two movably yoke parts along length, Width group, when preorientation, and in movable length, width group wherein one group, other one group keeps fixing; In the time of the compacting of radially oriented magnetic field, four movably yoke part closed group become a complete annulus, form complete field circuit.
According to another aspect of the present invention, a kind of press device of preparing radially oriented magnetic ring or multi-pole magnet-ring is provided, comprise formpiston, former and mould iron core, it is characterized in that: yoke is along the circumferential direction divided into four movably yoke parts, respectively comprise two movably yoke parts along length, Width group; This press device comprise with two couple along length, Width group movably yoke divide corresponding two pairs of magnet exciting coils and two groups of yoke travel chamber.
Powder preorientation can complete on as magnet charger at external equipment, but the mobility variation of powder, the difficulty being filled in die cavity strengthens, and powder to be exposed to the airborne time elongated, cause hydraulic performance decline; And preorientation direction is single.Therefore, method preorientation of the present invention has obvious advantage, and preorientation again after powder filling has not only improved mobility but also anti-oxidation, and preorientation can be along length A-A, width B-B and height C-C multiple directions.
According to the present invention, owing to passing through to improve press device, change two pairs of yokes into movable part, movement by yoke is carried out the preorientation under magnetic field to powder, it can further improve the degree of orientation of magnet ring under the prerequisite that does not change mould structure, and vertical direction table magnetic uniformity is significantly improved, thereby reach the object that improves magnet ring magnetic property.
Simultaneously, owing to having adopted blank pretreating process, by this improvement, the internal stress that pressing process is created on magnet ring inwall has obtained effective release, avoid the contraction in sintering process inhomogeneous, thereby reduce the appearance of magnet ring at sintering process cracking phenomena, the rate of finished products after magnet ring sintering is significantly improved.
Accompanying drawing explanation
Fig. 1 is the front portion cutaway view according to electromagnet structure of the present invention; And
Fig. 2 is the cutaway view along I-I direction in Fig. 1.
Embodiment
According to the present invention, the preparation method of radially oriented magnetic ring and multi-pole magnet-ring comprises:
(1) prepare alloy cast ingot: raw material is carried out in vacuum or inert gas to routine and be smelted into alloy cast ingot;
(2) alloy cast ingot fragmentation: alloy cast ingot is carried out in inert atmosphere to coarse crushing and hydrogen fragmentation, obtain particle diameter and be the powder of hundreds of microns; The antioxidant that adds 0.01～1wt% in powder after hydrogen fragmentation mixes 2 hours; Use airflow milling by the corase meal Crushing of Ultrafine after hydrogen fragmentation, obtains the alloy powder of average grain diameter 4m left and right and even particle size distribution under nitrogen environment;
(3) powder preorientation: by powder filling in the mold cavity of moulding press, powder is carried out to preorientation operation; Change yoke into four displaceable members along the circumferential direction, when preorientation, move respectively, and in the time of the compacting of radially oriented magnetic field, a complete annulus of they closed compositions, forms complete field circuit.
(4) compressing under radially oriented magnetic field: then, to carry out orientation compacting action, the demagnetization demoulding in radially oriented magnetic field and take out, then carry out the static pressure operations such as 200MPa;
(5) blank preliminary treatment: blank magnet ring carries out pretreatment operation under protective atmosphere;
(6) magnet ring sintering: sintering, timeliness heat treatment obtain radially oriented magnetic ring under inert atmosphere or vacuum state; Then,
(7) carry out follow-up machine operations.
Describe below with reference to accompanying drawings the specific embodiment of the present invention in detail.
In Fig. 1 and Fig. 2, Reference numeral 1 represents upper cover plate; Reference numeral 2 represents that side supports; Reference numeral 3 represents magnet exciting coil; Reference numeral 4 represents yoke; Reference numeral 5 represents former; Reference numeral 6 represents side plate; Reference numeral 7 represents plate washer; Reference numeral 8 indicating impulse coils; Reference numeral 9 represents base; Reference numeral 10 represents cylinder; Reference numeral 11 represents magnetic; Reference numeral 12 represents core rod; Reference numeral 13 represents formpiston.
In Fig. 1, pulsed coil 8 arranges for the short transverse C-C of radially oriented ring is carried out to pre-magnetizing, there is no such design on other press.Increase pulsed coil 8 and not only contributed to, in short transverse, radially oriented ring is carried out to pre-magnetizing, and significantly improved the table magnetic uniformity in the short transverse of radially oriented ring, can contribute to so the radially oriented ring product that compacting is highly larger.
In accompanying drawing 2, yoke 4 is cylinder 10 control activities, carry out radially oriented before, yoke 4 can be pulled open respectively along A-A or B-B direction, powder is carried out to pre-magnetizing to improve the final magnetic energy product level of product, is non-existent on the former radially oriented ring press of such design.
Embodiment 1
Dress is when powder, and two yokes 4 of length A-A direction and two yokes 4 of width B-B direction form a complete circle, and after dress powder, seaming chuck declines and iron core closure.Two yokes 4 are moved to 50～150mm along A-A direction, then, magnet exciting coil 3B produces the magnetic field along B-B direction that polarity is identical, powder is carried out to preorientation for the first time, die cavity internal magnetic field size is 0.8～2.0T, after orientation, two yokes 4 of length A-A direction are pushed back to original position; Then, the yoke 4 of two width B-B directions is moved to 50～150mm along B-B direction, magnet exciting coil 3A produces a polarity same magnetic field, direction is along A-A direction, and die cavity internal magnetic field size 0.8～2.0T, after orientation, the yoke 4 of width B-B direction is pushed back to original position, and preorientation finishes.After preorientation, enter next operation, radially oriented magnetic field orientating compacting.
In order to solve the problem of Cracking in magnet ring sintering process, at radially oriented magnetic ring compressing and etc. after static pressure, under protective gas atmosphere (as inert gas Ar
2or N
2) or vacuum state under the inwall of magnet ring is carried out to integral grinding processing, internal diameter grinds away after 0.1～1mm, then carries out the heat treatment of sintering timeliness.
Embodiment 2
Dress is when powder, and two yokes 4 of length A-A direction and two yokes 4 of width B-B direction form a complete circle, and after dress powder, seaming chuck declines and iron core closure.Pulsed magnetic field is carried out to pulse pre-magnetizing along C-C direction (being short transverse), then, under radially oriented magnetic field, suppress magnet ring.
In order to solve the problem of Cracking in magnet ring sintering process, at radially oriented magnetic ring compressing and etc. after static pressure, under protective gas atmosphere (as inert gas Ar
2or N
2) or vacuum state under the inwall of magnet ring is carried out to integral grinding processing, internal diameter grinds away after 0.1～1mm, then carries out the heat treatment of sintering timeliness.
The present invention also provides a kind of press device of preparing radially oriented magnetic ring and multi-pole magnet-ring, this press device comprises: formpiston 13, former 5, mould iron core 12, it is characterized in that: two couples of yoke 4-4,4-4, the two couples of magnet exciting coil 3A-3A and 3B-3B, with yoke travel chamber 14A-14A, 14B-14B (not shown), described two pairs of yokes 4 can move forward and backward in yoke travel chamber 14.
According to the present invention, before radially oriented, powder is increased to preorientation operation and the preliminary treatment to blank before sintering.Change yoke 4 into displaceable member, when preorientation, move respectively, and in the time of the compacting of radially oriented magnetic field, a complete annulus of they closed compositions, forms complete field circuit.By increasing after preorientation, improve the degree of orientation of powder, improve the magnetic property of radially oriented magnetic ring.Use method and apparatus of the present invention can effectively improve the degree of orientation of radially oriented magnetic ring, significantly improve the magnetic energy product 3～5MGOe of radially oriented ring, and radiation magnetic loop vertical direction (axially) table magnetic uniformity is significantly improved, bring up to 10% by 15%, even bring up to 5% left and right by 15%.
By the preliminary treatment to blank, the internal stress that pressing process is created on magnet ring inwall has obtained effectively discharging, avoid the contraction in sintering process inhomogeneous, thereby reduce the appearance of radially oriented magnetic ring at sintering process cracking phenomena, made the rate of finished products after radially oriented magnetic ring sintering improve 20%.
The contrast effect of embodiment:
According to above disclosure, those skilled in the art can carry out such or such modification, perfect and supplementary, but this is all by the protection range of invention.
Claims (5)
1. a preparation method for radially oriented magnetic ring or multi-pole magnet-ring, comprises and prepares compacting, magnet ring sintering, follow-up machine operations step under alloy cast ingot, alloy cast ingot fragmentation, radially oriented magnetic field, it is characterized in that,
Under radially oriented magnetic field, before pressing step, be also provided with powder preorientation step, first powder filling arrived in the mold cavity of moulding press, and then powder is carried out to preorientation operation,
Before magnet ring sintering step, be also provided with blank pre-treatment step, blank magnet ring carries out pretreatment operation under protective atmosphere,
Yoke is along the circumferential direction divided into four movably yoke parts, respectively comprises two movably yoke parts along length, Width group, when preorientation, and in movable length, width group wherein one group, other one group keeps fixing;
This press device comprise with two couple along length, Width group movably yoke divide corresponding two pairs of magnet exciting coils and two groups of yoke travel chamber, in the time of the compacting of radially oriented magnetic field, four movably yoke part closed group become a complete annulus, form complete field circuit.
2. preparation method as claimed in claim 1, it is characterized in that, in powder preorientation process, the wherein distance of a group in movable length, width group is 50～150mm, after orientation, get back to initial position, magnetic field size 0.8～2.0T that magnet exciting coil produces in die cavity.
3. preparation method as claimed in claim 1, is characterized in that, in powder preorientation process, magnet exciting coil produces a pulsed magnetic field along short transverse, and mold cavity internal magnetic field size 0.8～2.0T, carries out pulse pre-magnetizing to powder in mold cavity.
4. preparation method as claimed in claim 1, is characterized in that, in blank preprocessing process, protective gas is Ar
2or N
2, the inwall of blank magnet ring is carried out to integral grinding processing, make internal diameter grind away 0.1～1mm.
5. prepare a press device for radially oriented magnetic ring or multi-pole magnet-ring, comprise formpiston, former and mould iron core, it is characterized in that:
Yoke is along the circumferential direction divided into four movably yoke parts, respectively comprises two movably yoke parts along length, Width group, when preorientation, and in movable length, width group wherein one group, other one group keeps fixing; And
This press device comprise with two couple along length, Width group movably yoke divide corresponding two pairs of magnet exciting coils and two groups of yoke travel chamber, in the time of the compacting of radially oriented magnetic field, four movably yoke part closed group become a complete annulus, form complete field circuit.
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| CN200910241438.8A CN102087917B (en) | 2009-12-02 | 2009-12-02 | Preparation method and pressing device for radiation-oriented magnet ring or multipolar magnet ring |
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| CN102087917B true CN102087917B (en) | 2014-06-25 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102364617A (en) * | 2011-11-25 | 2012-02-29 | 中国电子科技集团公司第九研究所 | High-uniformity radial orientation neodymium iron boron permanent magnet ring and method for preparing same |
| US10468166B2 (en) | 2011-12-27 | 2019-11-05 | Intermetallics Co., Ltd. | NdFeB system sintered magnet |
| KR101485282B1 (en) | 2011-12-27 | 2015-01-21 | 인터메탈릭스 가부시키가이샤 | Sintered neodymium magnet |
| CN104715916B (en) * | 2013-12-11 | 2018-01-12 | 北京中科三环高技术股份有限公司 | A kind of radially oriented magnetic ring former and method |
| CN105529131B (en) * | 2016-03-08 | 2017-10-13 | 佛山市川东磁电股份有限公司 | A kind of radiation of magnetic Nd-Fe-B ring is magnetized technique and device |
| CN105551711B (en) * | 2016-03-08 | 2017-11-10 | 佛山市川东磁电股份有限公司 | Magnetize technique and the device of a kind of magnetic Nd-Fe-B ring |
| CN108735423B (en) * | 2018-05-30 | 2020-06-30 | 中国航空工业集团公司北京长城计量测试技术研究所 | Radial four-magnetic-pole isothermal thermal magnetizing device |
| CN108777208B (en) * | 2018-05-30 | 2020-06-30 | 中国航空工业集团公司北京长城计量测试技术研究所 | Radial quadrupole magnetizing device of sealed magnetic static ring |
| CN112967861B (en) * | 2021-03-02 | 2022-09-16 | 东莞市粤海磁电科技有限公司 | Automatic multi-pole magnetizing equipment for magnet magnetizing |
| CN114551028B (en) * | 2022-04-15 | 2024-06-07 | 中钢天源股份有限公司 | Obliquely-charged multipolar magnetic ring and manufacturing method thereof |
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