CN103971917B - The forming method of sintered NdFeB radiation magnetic loop and equipment thereof - Google Patents
The forming method of sintered NdFeB radiation magnetic loop and equipment thereof Download PDFInfo
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- CN103971917B CN103971917B CN201410194743.7A CN201410194743A CN103971917B CN 103971917 B CN103971917 B CN 103971917B CN 201410194743 A CN201410194743 A CN 201410194743A CN 103971917 B CN103971917 B CN 103971917B
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Abstract
The present invention relates to hydrostatic profile method and the equipment thereof of sintered NdFeB radiation magnetic loop, specially sintered NdFeB radiation magnetic loop.Solve problem that alignment magnetic field and the magnet ring height that current sintering magnetic Nd-Fe-B ring production process exists can not take into account and the too high problem of percent defective.The method comprises the steps: 1) first magnetic powder is carried out magnetic field orientating preforming, and obtain preforming magnet ring blank；Preforming pressure should meet the needs of molding and the orientation of magnetic powder is fixed up, and leaves the density space compressed to again magnet ring blank；The height of magnet ring blank meets required orientation radiation field intensity；2) several magnet ring blanks that step 1 is obtained are through on a metal core axle with matched in clearance, and obtain the combination of preforming magnet ring；3) magnet ring combination being imposed isostatic pressed, isostatic pressure eliminates magnet ring blank self and mutual density space, and multiple magnet ring blanks are synthesized a magnet ring.This method can also be used for other rare earth permanent magnet sintering radiation magnetic loop.
Description
Technical field
The present invention relates to magnetic material, particularly to forming method and the equipment thereof of sintered NdFeB radiation magnetic loop, specially sintered NdFeB radiation magnetic loop.
Background technology
The radially oriented magnet ring of cemented iron boron is possible not only to magnetize into radiation magnetic loop and can also magnetize and become any multi-pole magnet-ring, no matter from magnetic property or be suitable for producing various high performance magneto from operating temperature, the most high performance neodymium iron boron or other rare earth sintering radiation magnetic loop also function to the effect do not replaced in national defence.
Owing to the problem in some Technologies does not has been resolved all the time, sintered NdFeB radiation magnetic loop is applied the most on a large scale so far.For filling up this vacancy, people produce neodymium iron boron radiation magnetic loop or multi-pole magnet-ring, wherein isotropism bonding ferrum boron magnet ring with bonding process, have realized industrialized great production, but its magnetic energy product to reach 10MGo the prettyst good.Occurring in that the most again anisotropic bond ferrum boron magnet ring, its magnetic energy product can reach 18-22MGo, currently has the gesture of fast development, but its operating temperature is on the low side, which limits its range.Cemented iron boron magnet ring magnetic energy product can reach 30-40MGo, and operating temperature can reach 150 degree even 200 degree, and these are all that bonding iron boron magnet is cannoted substituted.
nullSintered NdFeB radiation magnetic loop production process runs into two difficulties: 1、The first operation of sintered magnet molding is magnetic field orientating molding，In order to reach the higher degree of orientation，Alignment magnetic field must reach certain intensity，The biggest difficulty is not had for parallel magnetic field and vertical magnetic field，But the radiation field situation needed for being orientated radiation magnetic loop is just made a world of difference，Due to by the magnetic field of magnetic ring inner hole by the magnetically saturated restriction of magnetic core，Its magnetic flux is limited，These magnetic flux distribution form, to the side of magnet ring, the alignment magnetic field radiated，Owing to the area of the outer surface of magnet ring is typically much deeper than magnetic ring inner hole area，Cause its magnetic field intensity more much lower than the saturation magnetic field intensity of magnetic core，The height that have to reduce magnet ring in order to obtain the alignment magnetic field of some strength reduces magnet ring external surface area，The magnet ring height that this is the most usually much less than actually needed.2, the second operation work of sintered magnet molding is sintering; magnet ring blank often Density inhomogeneity due to oriented moulding; during sintering, there is deformation or cracking in great majority; yield rate is the lowest; the production cost of sintering magnetic Nd-Fe-B ring is greatly improved, even makes the big production of scale of sintering magnetic Nd-Fe-B ring become infeasible.
Summary of the invention
The present invention solves the problem that current sintering magnetic Nd-Fe-B ring production process exists, it is provided that the forming method of a kind of sintered NdFeB radiation magnetic loop and equipment thereof.
The present invention adopts the following technical scheme that realization: the forming method of sintered NdFeB radiation magnetic loop, comprises the steps: 1) first magnetic powder is carried out magnetic field orientating preforming, obtain preforming magnet ring blank；The selection of preforming pressure should meet the needs of molding and the orientation of magnetic powder is fixed up, and leaves the density space compressed to again magnet ring blank in follow-up secondary compression step；The height of magnet ring blank is as the criterion to meet required alignment magnetic field, and to make integral multiple of its height as far as possible be the magnet ring height being actually needed；2) magnet ring height according to actual needs, several (if the magnet ring height being just actually needed the shortest the most do not repel single) preforming magnet ring blank that step 1) is obtained is through on a metal core axle with matched in clearance, and obtains the magnet ring combination for second-compressed molding；3) magnet ring combination being imposed isostatic pressed, isostatic pressure should be large enough to eliminate magnet ring blank self and mutual density space, and multiple preforming magnet ring blanks are combined into an overall magnet ring, thus obtains the final molding magnet ring for sintering.
Art is known or is easily drawn by limited test, under the pressure not less than 50Mpa, magnetic powder can meet the needs of molding and the orientation of magnetic powder is fixed up, can conserved density space under the pressure of no more than 100Mpa, therefore, the preforming pressure described in step 1 is as well known to those skilled in the art or easily determines.The preferred 50-100Mpa of the present invention.The height of preforming magnet ring blank is meeting required alignment magnetic field and be as the criterion (owing to the magnetic field of magnetic core of magnetic ring inner hole is by magnetically saturated restriction, the biggest alignment magnetic field is the least, otherwise, the least alignment magnetic field is the biggest).On the premise of meeting required alignment magnetic field, the height of magnet ring preforming blank also should make its integral multiple be the magnet ring height being actually needed as far as possible.The matched in clearance of preforming magnet ring blank and metal core axle is in order to prevent deformation or the cracking of magnet ring blank.The isostatic pressure imposing magnet ring assembly is that those skilled in the art are easily determined by limited test or draw suitable isostatic pressure for the purpose of eliminating magnet ring blank self and mutual density space thus multiple preforming magnet ring blanks are synthesized a magnet ring；The preferred 200-600Mpa of the present invention, if technically allowing to select higher isostatic pressure to improve the density of post forming blank further is useful to reducing sintering shrinkage deformation.
The forming process of magnet ring is creatively divided into preforming and post forming by the present invention；Only need to consider that the demand of alignment magnetic field and its integral multiple are the magnet ring height being actually needed at preform stage, and only need to consider to select the quantity of preforming blank by the height requirement of post forming magnet ring in the final molding stage, overcome the problem that the alignment magnetic field of prior art existence can not be taken into account with magnet ring height.The method makes magnet ring even density simultaneously, it is ensured that uniform shrinkage in magnet ring sintering process, does not ftractures, indeformable, makes yield rate be greatly improved so that it is large-scale production is possibly realized.This method is also applied for other rare earth permanent magnet sintering radiation magnetic loop.
A kind of isostatic pressing machine in order to realize the method for the invention, including frame, is positioned at the high pressure chest of frame lower, the upper cylinder pressure of frame top；The bottom of described high pressure chest has oil-in, dry bag it is provided with in high pressure chest, the gland for being compressed at dry bag mouth edge it is fixed with at high pressure chest accent, the hole that the piston rod with upper cylinder pressure coordinates is had on gland, dry bag is stretched in the piston rod packing of upper cylinder pressure hole in overpressure cap, and the piston rod external diameter of upper cylinder pressure is identical with the internal diameter of dry bag；Oil-in bottom high pressure chest is connected with supercharger；Described supercharger includes pressurized cylinder and the booster cavity tightened together, in booster cavity is stretched in the piston rod packing of described pressurized cylinder, (diameter of booster cavity is easy to it by just more than pressurized cylinder piston shank diameter, its size and output pressure are unrelated), having oil-out bottom booster cavity, this oil-out is connected with the oil-in bottom high pressure chest through pressure duct；Wherein pressurized cylinder identical with upper Press cylinder device (i.e. the external diameter of both pistons and piston rod is identical)；High pressure chest (dry bag is outer) and booster cavity are full of pressure oil.
During use, putting identical with dry bag internal diameter for the external diameter of preforming magnet ring blank magnet ring combination into dry bag, go up that cylinder pressure is descending treats that its piston rod entrance dry bag is pressed close to magnet ring and i.e. stopped afterwards, then go up cylinder pressure and pressurized cylinder starts descent of piston simultaneously, isostatic pressed starts.Upper cylinder pressure and pressurized cylinder are about the same in addition to connected mode and stroke, and their piston and diameter of piston rod are the same.The effect going up cylinder pressure in working order is that the magnet ring assembly in dry bag is imposed downward axial force, and dry bag realizes the isostatic pressed to magnet ring assembly jointly, and isostatic pressed is opened dry bag and passed in and out for workpiece after completing.The effect of dry bag is to transmit static pressure to workpiece, and workpiece is isolated with pressure oil.The effect of gland is clamping dry bag and undertakes huge axial force produced by dry bag edge.Pressurized cylinder piston shank diameter is d, and piston diameter is D, and when its input pressure is p1, its piston rod pressurizes in booster cavity, and the oil-out pressure making booster cavity is P2, and the major function of supercharger is to provide superhigh pressure liquid for high pressure chest.Be readily seen p2/p1 equal to D/d square.If p2/p1=K, K=10 during design, might as well be selected, select the d maximum gauge equal to magnet ring blank.The pressure p 2 that pressurized cylinder piston bar produces in booster cavity is delivered to high pressure chest through pressure duct, as seen from Figure 4 around dry bag and base pressure p2 is delivered to bottom surface and the side of magnet ring blank through dry bag, the above of magnet ring blank is pressed by upper pressure cylinder piston bar, owing to upper cylinder pressure and pressurized cylinder are the same, its pressure also for its input pressure of p2(be also p1).Rising along with p1 pressure, the proportional rising of p2, after p2 reaches the pressure set, upper cylinder pressure and pressurized cylinder are closed and are entered packing stage, suitably after pressurize, upper cylinder pressure and pressurized cylinder piston are up until respective piston reset, whole isostatic pressed cycle of operation terminates, and takes out workpiece and can start the cycle of operation of next round.P1 is provided pressure by Hydraulic Station the most upwards cylinder pressure and pressurized cylinder, and maximum working pressure (MWP) can generally achieve 30MPa, if the K=10 selected just has maximum static pressure power p2=300MPa.
Magnet ring assembly can be implemented second-compressed and obtain the final molding radiation magnetic loop for sintering by isostatic pressing machine of the present invention.Its reasonable in design, novelty, particularly dry bag structure design, it is very easy to the processing of magnet ring；Structure design (including size Selection) of its supercharger can be readily available high pressure, and realizes the isostatic pressed to magnet ring, and easy to use.Lower but also can thoroughly avoid the pressure medium pollution to workpiece than using common isostatic pressing machine to complete this technical process not only efficiency high cost.
Accompanying drawing explanation
Fig. 1 is the structural representation of isostatic pressing machine of the present invention；
Fig. 2 is the side view of Fig. 1；
Fig. 3 is the structural representation of the high pressure chest of isostatic pressing machine of the present invention；
Fig. 4 is the fundamental diagram of isostatic pressing machine of the present invention；
Fig. 5 is the structural representation of the supercharger of isostatic pressing machine of the present invention；
In figure: 1-frame, 2-high pressure chest, the upper cylinder pressure of 3-, 4-oil-in, 5-dry bag, 6-gland, 7-pressurized cylinder, 8-booster cavity, 9-oil-out, 10-pull bar, 11-compensates rubber blanket.
Detailed description of the invention
The forming method of sintered NdFeB radiation magnetic loop, comprises the steps: 1) first magnetic powder is carried out magnetic field orientating preforming, obtain preforming magnet ring blank；The selection of preforming pressure should meet the needs of molding and the orientation of magnetic powder is fixed up, and leaves the density space compressed to again magnet ring blank in follow-up secondary compression step；The height of magnet ring blank is as the criterion to meet required alignment magnetic field, and to make integral multiple of its height as far as possible be the molding magnet ring height being actually needed；2) magnet ring height according to actual needs, several preforming magnet ring blanks that step 1) is obtained are through on a metal core axle with matched in clearance, and obtain the magnet ring combination for second-compressed molding；3) magnet ring combination being imposed isostatic pressed, isostatic pressure should be large enough to eliminate magnet ring blank self and mutual density space, and multiple preforming magnet ring blanks are combined into an overall magnet ring, thus obtains the molding magnet ring for final sintering.According to common process molding magnet ring is sintered subsequently and following process etc., obtains sintered NdFeB radiation magnetic loop, can use after magnetizing.When being embodied as, for convenience of the realization of described forming method, before magnet ring assembly implements isostatic pressed, static pressure can be uniformly transferred in magnet ring combination outer cladding, can will not pollute the soft protective layer that magnet ring combines by fluid partitioning again, prepare for implementing isostatic pressed.Preforming pressure selects 100Mpa(also to may select 50 Mpa, 60 Mpa, 70 Mpa, 80 Mpa, 90 Mpa).Isostatic pressure selects 250 Mpa(also to may select 200 Mpa, 210 Mpa, 220 Mpa, 230 Mpa, 240 Mpa, 260 Mpa, 270 Mpa, 280 Mpa, 290 Mpa, 300 Mpa, 350 Mpa, 400 Mpa, 450 Mpa, 500 Mpa, 550 Mpa, 600 Mpa).
In order to realize the isostatic pressing machine of the method for the invention, including frame 1, it is positioned at the high pressure chest 2 of frame 1 bottom, the upper cylinder pressure 3 of frame top；The bottom of described high pressure chest 2 has oil-in 4, dry bag 5 it is provided with in high pressure chest 2, the gland 6 for being compressed at 5 mouthfuls of edges of dry bag it is fixed with at high pressure chest accent, the hole that the piston rod with upper cylinder pressure 3 coordinates is had on gland 6, dry bag is stretched in the piston rod packing of upper cylinder pressure 3 hole in overpressure cap 6, and the piston rod external diameter of upper cylinder pressure 3 is identical with the internal diameter of dry bag 5；Oil-in 4 bottom high pressure chest 2 is connected with supercharger；Described supercharger includes pressurized cylinder 7 and the booster cavity 8 tightened together, the piston rod packing of described pressurized cylinder 7 stretch in booster cavity 8 (internal diameter of booster cavity 8 more than pressurized cylinder piston shank diameter to facilitate piston rod to pass in and out, its size is unrelated with output pressure), having oil-out 9 bottom booster cavity 8, this oil-out 9 is connected with the oil-in 4 bottom high pressure chest 2 through pressure duct；Wherein pressurized cylinder 8 identical with upper cylinder pressure 3 structure (i.e. the external diameters of its piston and piston rod etc. are identical)；High pressure chest 2(dry bag is outer) and booster cavity 8 be full of pressure oil.When being embodied as, pressurized cylinder 7 and booster cavity 8 are fastened them together by pull bar 10.The magnet ring produced in real work is many specifications, if magnet ring blank external diameter is more than dry bag internal diameter, the magnet ring hydrostatic profile machine of bigger specification must be selected, if magnet ring blank diameter is less than dry bag internal diameter, also needing to include a rubber tube, the internal diameter of this rubber tube is equal to magnet ring blank external diameter, external diameter is equal to the internal diameter of dry bag, highly equal to the height of magnet ring combination, fill up the space between magnet ring assembly and dry bag and other unnecessary spaces in a word, prevented dry bag excessive deformation just.The mandrel of magnet ring is rigidity, its height should be less than the effective depth (effective depth of dry bag refers to that its energy Free Transform uniformly transfers the height of the part of static pressure, it is common that refer to play that section of height of 2-3 the dry bag thickness in distance gland 6 lower surface from dry bag inner chamber bottom surface) of dry bag.In magnet ring combines, when the height of mandrel is i.e. more than magnet ring combined altitudes more than the height sum of each magnet ring blank, in order to reliably realize the isostatic pressed of magnet ring combination on this isostatic pressing machine, also need to include one or several compensation rubber blanket 11, compensate top layer or top layer and bottom that rubber blanket 11 is enclosed within mandrel and is positioned at magnet ring combination, make the height of each magnet ring blank plus all compensation rubber blanket height sums not less than the height of (being i.e. equal or slightly larger than) mandrel by compensating the participation of rubber blanket 11.If more than the twice of the height that mandrel height i.e. combines more than magnet ring more than each magnet ring blank height sum, two groups of magnet ring blanks can be laid, but one must be added between two groups of magnet ring blanks and compensate pad, in order to isolate, if add compensation pad the most again, until the height of each magnet ring blank is equal or slightly larger than the height of mandrel plus all compensation rubber blanket height.Which improves work efficiency, once complete the isostatic pressed of two groups of blanks.
Claims (9)
1. the forming method of sintered NdFeB radiation magnetic loop, it is characterised in that comprise the steps: 1) first magnetic powder is carried out magnetic field orientating preforming, obtain preforming magnet ring blank；The selection of preforming pressure should meet the needs of molding and the orientation of magnetic powder is fixed up, and leaves the density space compressed to again magnet ring blank in follow-up secondary compression step；The height of magnet ring blank is as the criterion to meet required alignment magnetic field；2) magnet ring height according to actual needs, several preforming magnet ring blanks that step 1) is obtained are through on a metal core axle with matched in clearance, and obtain the magnet ring combination for second-compressed molding；3) magnet ring combination being imposed isostatic pressed, isostatic pressure should be large enough to eliminate magnet ring blank self and mutual density space, and multiple preforming magnet ring blanks are combined into an overall magnet ring, thus the molding magnet ring finally sintered.
The forming method of sintered NdFeB radiation magnetic loop the most according to claim 1, it is characterised in that preforming pressure is 50-100Mpa, isostatic pressure is 200-600Mpa.
The forming method of sintered NdFeB radiation magnetic loop the most according to claim 2, it is characterised in that preforming pressure is 100Mpa, isostatic pressure is 250Mpa.
4. according to the forming method of the sintered NdFeB radiation magnetic loop described in claim 1 or 2 or 3, it is characterised in that the integral multiple at the height of step 1) middle magnetic ring blank is the molding magnet ring height being actually needed.
5. according to the forming method of the sintered NdFeB radiation magnetic loop described in claim 1 or 2 or 3; it is characterized in that implementing before isostatic pressed in magnet ring combination, static pressure can be uniformly transferred in magnet ring assembly outer cladding, can will not pollute the soft protective layer of magnet ring assembly by fluid partitioning again.
6. realize the isostatic pressing machine of forming method as claimed in claim 5, including frame (1), be positioned at the high pressure chest (2) of frame (1) bottom, the upper cylinder pressure (3) of frame top；The bottom of described high pressure chest (2) has oil-in (4), it is characterized in that, dry bag (5) it is provided with in high pressure chest (2), the gland (6) for being compressed at dry bag (5) mouth edge it is fixed with at high pressure chest accent, the hole that the piston rod with upper cylinder pressure (3) coordinates is had on gland (6), dry bag is stretched in the piston rod packing of upper cylinder pressure (3) hole in overpressure cap (6), and the piston rod external diameter of upper cylinder pressure (3) is identical with the internal diameter of dry bag (5)；The oil-in (4) of high pressure chest (2) bottom is connected with supercharger；Described supercharger includes pressurized cylinder (7) and the booster cavity (8) tightened together, the piston rod packing of described pressurized cylinder (7) is stretched in booster cavity (8), booster cavity (8) bottom has oil-out (9), and this oil-out (9) is connected through the oil-in (4) of pressure duct with high pressure chest (2) bottom；Wherein pressurized cylinder (7) is identical with upper cylinder pressure (3) structure；High pressure chest (2) and booster cavity (8) are full of pressure oil.
Isostatic pressing machine the most according to claim 6, it is characterised in that pressurized cylinder (7) and booster cavity (8) are fastened them together by pull bar (10).
Isostatic pressing machine the most according to claim 6, it is characterized in that, when preforming magnet ring blank external diameter is less than dry bag internal diameter, also including a rubber tube, the internal diameter of this rubber tube is equal to magnet ring blank external diameter, the external diameter of this rubber tube is equal to the internal diameter of dry bag, and height is equal to the height of magnet ring combination.
9. according to the isostatic pressing machine described in claim 6 or 8, it is characterized in that in magnet ring combines, when the height of mandrel is more than the height sum of each magnet ring blank, also need to include one or several compensation rubber blanket (11), compensate top layer or top layer and bottom that rubber blanket 11 is enclosed within mandrel and is positioned at magnet ring combination, make the height of each magnet ring blank plus all compensation rubber blanket height sums not less than the height of mandrel by compensating the participation of rubber blanket (11).
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| CN104174843A (en) * | 2014-08-11 | 2014-12-03 | 北京京磁强磁材料有限公司 | Oriented compression moulding method for sintered NdFeB |
| CN104493158B (en) * | 2014-12-23 | 2017-07-21 | 宁波科田磁业有限公司 | Reduce a kind of preparation method and its device of sintered NdFeB magnetic declination |
| CN106042430B (en) * | 2016-06-21 | 2018-10-12 | 董开 | A kind of dry bag formula powder assistant formation method and device |
| CN105965948B (en) * | 2016-07-12 | 2017-11-07 | 董中天 | Film dry bag formula isostatic pressing machine |
| CN106653269B (en) * | 2016-12-20 | 2018-10-23 | 山西大缙华磁性材料有限公司 | Make the process and its tooling of high consistency sintered Nd-Fe-B permanent magnet |
| CN109887703B (en) * | 2018-12-04 | 2023-08-15 | 杭州史宾纳科技有限公司 | NdFeB (neodymium iron boron) orientation device of square wave magnetic ring |
| CN110783051A (en) | 2019-12-13 | 2020-02-11 | 烟台首钢磁性材料股份有限公司 | Radiation-oriented sintered neodymium-iron-boron magnetic tile, preparation method and forming device |
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| CN2551376Y (en) * | 2002-07-03 | 2003-05-21 | 董中天 | Isostatic press |
| WO2011002418A1 (en) * | 2009-07-03 | 2011-01-06 | Agency For Science, Technology And Research | Method and/or primers for the detection of mycobacterium tuberculosis |
| CN102528029A (en) * | 2010-12-14 | 2012-07-04 | 北京中科三环高技术股份有限公司 | Pressing die and method for annular neodymium-iron-boron permanent magnet |
| CN201989334U (en) * | 2011-01-07 | 2011-09-28 | 陈洪平 | Full-automatic ball press machine |
| CN102189701A (en) * | 2011-03-25 | 2011-09-21 | 湘潭华诚机械有限公司 | Full-automatic isostatic pressing forming machine for multi-station horizontal type rotary operating platform |
| 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 |
| CN202656277U (en) * | 2012-04-13 | 2013-01-09 | 苏州晶瓷超硬材料有限公司 | Dried bag type isostatic pressing machine |
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