WO2004105062A1 - Procede de production d'un aimant lie - Google Patents

Procede de production d'un aimant lie Download PDF

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Publication number
WO2004105062A1
WO2004105062A1 PCT/JP2004/006013 JP2004006013W WO2004105062A1 WO 2004105062 A1 WO2004105062 A1 WO 2004105062A1 JP 2004006013 W JP2004006013 W JP 2004006013W WO 2004105062 A1 WO2004105062 A1 WO 2004105062A1
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WIPO (PCT)
Prior art keywords
mold
powder
compound
cavity
thermosetting resin
Prior art date
Application number
PCT/JP2004/006013
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English (en)
Japanese (ja)
Inventor
Yoshinobu Honkura
Hironari Mitarai
Kenji Noguchi
Hiroshi Matsuoka
Original Assignee
Aichi Steel Corporation
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Publication date
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Publication of WO2004105062A1 publication Critical patent/WO2004105062A1/fr

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/032—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials
    • H01F1/04—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys
    • H01F1/06—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys in the form of particles, e.g. powder
    • H01F1/08—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together
    • H01F1/083—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together in a bonding agent
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/0253—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing permanent magnets
    • H01F41/0273—Imparting anisotropy

Definitions

  • Such permanent magnets include sintered magnets, but recently, bonded magnets that are excellent in moldability, physical properties, handleability, etc. are frequently used. Pond magnets are obtained by solidifying isotropic magnet powder or anisotropic magnet powder with resin or the like. When high magnetic properties are required, anisotropic magnet powder is often used.
  • Patent Documents 1 and 2 below disclose such a method for producing a bond magnet, for example.
  • Patent Document 1 discloses a single-stage molding method in which a compound composed of anisotropic magnet powder and a thermosetting resin is supplied, oriented, and compression-molded in the same molding die heated to 150 ° C. Is disclosed.
  • Patent Document 2 roughly divides the production method of Patent Document 1 into two parts, and performs powdering, orientation, and light compression molding in a first molding die heated to 150
  • a two-stage molding method is disclosed which comprises a preforming step of manufacturing a preform and a main molding step of strongly compressing and densifying the preformed body in a second molding die heated to 150 ° C. ing.
  • the compound is directly fed (weighed and filled) to the cavity of the molding die heated to 150 ° C.
  • the temperature of 150 ° C. is a temperature at which the thermosetting resin of the compound melts, as is clear from the above-mentioned patent document.
  • the thermosetting resin in the compound is at least partially softened or melted, and most of the compound adheres to the cavity wall of the molding die.
  • the filling passage of the compound becomes narrow, and it becomes difficult to sufficiently fill a predetermined amount of the compound into the cavity.
  • the weighing of the compound varies from product to product, and the filling of the compound becomes uneven even in one to three products.
  • Patent Document 3 since the magnetic field orientation and the pressure molding are performed at the same time during the secondary molding, the molding pressure is too high from the viewpoint of the magnetic field orientation, and the pressure molding is viewed from the viewpoint of the pressure molding. If molding pressure is low. As a result, the anisotropic magnetic powder is not sufficiently oriented, the density of the obtained secondary molded body is low, and the magnetic properties of the pound magnet after the hardening treatment are sufficient. It will be insufficient without being exhibited.
  • the present invention has been made in view of such circumstances, and an object of the present invention is to provide a method for manufacturing a bonded magnet capable of obtaining uniform and stable magnetic characteristics.
  • the present inventor has conducted intensive research to solve this problem, and as a result of repeated trial and error, first, when powdering the compound to the cavity, when the wall surface temperature of the cavity is set near room temperature, the compound is applied to the wall surface. Does not adhere, evenly fills the cavity
  • the present inventor has newly found that the present invention has been developed and completed the present invention.
  • a compound comprising anisotropic magnet powder and a thermosetting resin is weighed and filled into a cavity having a wall surface temperature lower than the softening point of the thermosetting resin. Applying an orientation magnetic field while heating the thermosetting resin to a softened or molten state by heating the weighed-filled compound or the powder compact of the compound to a temperature higher than the softening point.
  • a dense bonding step of forming a bonded magnet molded body tightly bonded by the method described above.
  • the compound in the weighing and filling step, the compound is weighed and filled into a cavity whose wall surface temperature is lower than the softening point of the thermosetting resin in the compound.
  • the thermosetting resin in the compound is not softened in the weighing and filling step, and the compound is prevented from adhering to the wall surface of the cavity.
  • the compound is smoothly filled into the cavity, the filling amount is stabilized, and the distribution of the compound in the cavity is almost uniform. Therefore, high-quality bonded magnets with excellent density and high density can be stably mass-produced with good yield without density and magnetic characteristics.
  • the deposition start temperature is the temperature at which the compound begins to deposit on the wall of the cavity. the above It can be said that the softening point is an index of the adhesion start temperature.
  • the attachment start temperature is not always uniformly determined depending on the type of the thermosetting resin, and cannot be said to be equal to the softening point. In order to specifically specify the deposition start temperature, a complicated test or the like may have to be actually performed. Therefore, in the present invention, in order to avoid such annoyance, the wall surface temperature is considered based on the above “softening point”.
  • the measurement position of the wall surface temperature of the cavity is not particularly limited. This is because the entire wall usually has a substantially uniform temperature. However, the temperature around the inlet opening (for example, the upper opening) of the cavity has a major effect on the filling of the compound into the cavity. Therefore, it is advisable to use the temperature near the inlet opening of the cavity as an index.
  • the above three processes are performed separately in dedicated molding machines. Preferably. Thereby, for example, it is not necessary to change the temperature of the mold for each process, and the life of the mold can be extended.
  • the operating rate of each molding machine is correspondingly improved, and mass production of bonded magnets can be performed in a short time.
  • each molding machine can be put into a running state, and mass productivity can be further improved. According to the present invention, even in such mass production, bonded magnets of stable quality having excellent magnetic properties and shape accuracy can be efficiently obtained with a high yield (with a low defect rate).
  • the minimum width of the cavity is determined in consideration of the direction in which the compound is filled. That is, the minimum width along the filling direction of the compound is preferably set to the minimum width (W).
  • W minimum width
  • the minimum width (W) may be measured along the moving direction (filling direction) of the powder box.
  • the molding die where the weighed and filled compound is subjected to the alignment step etc. It is necessary to transfer to In this case, there is no meaning in the same compound state as at the time of filling. Therefore, as in the case of general powder molding, the weighed compound is lightly compression-molded in a cavity into powder compacts (Darine compact, molded compacts, plank compacts), and so on. It is convenient.
  • the weighing and filling step is not limited to mere weighing of the compound and filling into the cavity, but also includes a powder molding step of compression-molding the compound filled in the cavity and forming the powder compact to be subjected to the orientation step. It is preferable to include it.
  • the degree of compaction of the powder compact may be such that the compressed compound does not collapse and can be handled.
  • the molding pressure may be, for example, about 70 to 294 MPa.
  • the transfer of the powder compact from the weighing and filling step to the orientation step may be performed manually or via a jig (a cassette or the like). Through a jig, the powder compact has good shape retention and is suitable for automation.
  • a transfer jig is not limited to the above case, and the same applies to the case where the preform is transferred from the orientation step to the close bonding step.
  • thermosetting resin In the orientation step according to the present invention, “softened state” and “molten state” are not strictly distinguished. In short, it is enough if the thermosetting resin is heated and its viscosity is reduced so that the anisotropic magnet powder can be rotated and moved.
  • the degree of orientation of the anisotropic magnet powder also depends on the strength of the applied orientation magnetic field. If the strength of the alignment magnetic field is applied in a state where the viscosity of the thermosetting resin is appropriately reduced, it may be set to, for example, 320 to 800 kA / m.
  • thermosetting resin Even if the thermosetting resin is heated, it first softens and melts, and its viscosity is greatly reduced, reaching a peak in viscosity reduction. After that, when the peak is exceeded, a cross-linking reaction between the molecules is accelerated, and the viscosity decreases and the resin is cured. By this curing, a bonded magnet made of oriented anisotropic magnet powder is obtained. As long as the thermosetting resin is heated at a temperature at which the curing reaction proceeds, the curing of the thermosetting resin gradually progresses from the orientation step to the close bonding step described below.
  • the curing of the thermosetting resin may proceed from the weighing and filling step. From such a viewpoint, it is indispensable to control the curing reaction of the thermosetting resin by appropriately adjusting the heating temperature of the compound and the holding time thereof in order to effectively perform each step. For example, in the orientation step, as described above, a stage where this curing reaction has not progressed much is used. In addition, although the thermosetting resin has not lost its fluidity in the close bonding step described below, the thermosetting resin has a degree such that the oriented anisotropic magnet powder is maintained in a compacted state by compression molding. Utilizes the stage of curing.
  • the oriented anisotropic magnet powder and the like are densely coupled. It is necessary to transfer to the forming die for performing the process. Therefore, as in the case of the mass filling step, in the case of the orientation step, the oriented anisotropic magnet powder and the thermosetting It is preferable to include a preforming step in which the curable resin is heated and compression-molded, the curing reaction proceeds to a limit where the orientation state of the magnet powder is preserved, and a preformed body to be subjected to the dense bonding step is formed. By forming the preformed body in the preforming step in this way, the transfer from the orientation step to the dense bonding step becomes easy.
  • the molding pressure during this pre-molding step may be, for example, about 147-343 MPa, which is higher than the molding pressure during the powder molding step (weighing and filling step) described above, and the subsequent dense bonding step. It is preferably lower than the medium molding pressure.
  • the bonded magnet molded body obtained by the dense bonding step may be a bonded magnet in which the thermosetting resin is completely cured, or may be a thermosetting resin in which the curing of the thermosetting resin is incomplete. . Since it takes a long time to completely cure the thermosetting resin, a large number of bonded magnet moldings whose thermosetting resin has not been completely cured are subjected to heat curing (curing heat treatment). It is more efficient.
  • the present invention further includes, before the orientation step, a lubricant applying step of applying a lubricant to at least the surface of the powder molded body obtained after the weighing and filling step.
  • a lubricant applying step of applying a lubricant to at least the surface of the powder molded body obtained after the weighing and filling step.
  • the method for manufacturing a bonded magnet of the present invention can be performed in a single D mold. However, in consideration of mass productivity, it is efficient to perform each process in a separate mold.
  • the weighing and filling step is performed in a first mold
  • the orientation step is performed in a second mold different from the first mold
  • the close coupling step is performed in the first mold. It is preferable to perform the third mold different from the second mold.
  • materials having excellent wear resistance such as cemented carbide and tool steel, are used. These materials do not have very high magnetic permeability, but in the first place, in the dense coupling step, it is not necessary to apply an orientation magnetic field, or even if it is applied, a weak orientation magnetic field is sufficient, so these materials are sufficient.
  • a non-magnetic material having no influence of remanence or the like at least on the outer and inner peripheral wall surfaces of the cavity in order to improve the filling property of the compound.
  • composition, type, and the like of the anisotropic magnet powder are not limited, and any known magnet powder can be used. Regardless of the method of producing each of these magnet powders, a so-called rapid solidification method or a hydrogenation method (d-HDDI ⁇ I, HDDR method) may be used.
  • the anisotropic magnet powder contained in the compound is not limited to a single type of magnet powder, but may be a mixture of a plurality of types of magnet powders and kneaded. As the anisotropic magnet powder is finer, it can be moved in the orientation step and is more easily oriented. However, it is also possible to use appropriately granulated magnet powder.
  • Thermosetting resins include epoxy resins, phenolic resins, and melamine resins. These thermosetting resins may be attached in powder form around the anisotropic magnet powder, or may be coated in a film around the anisotropic magnet powder.
  • Additives include lubricants such as zinc stearate, aluminum stearate, and alcohol-based lubricants, titanate-based or silane-based coupling agents, curing agents such as 4.4'-diaminodiphenylmethane (DDM), and TPP.
  • lubricants such as zinc stearate, aluminum stearate, and alcohol-based lubricants
  • titanate-based or silane-based coupling agents such as 4.4'-diaminodiphenylmethane (DDM), and TPP.
  • curing accelerators such as S (trade name of Hokuko Chemical Co., Ltd.), which may be added in small amounts in the compound.
  • the mixing ratio of the anisotropic magnet powder and the thermosetting resin is about 80 to 90% by volume of the anisotropic magnet powder and about 10 to 20% by volume of the thermosetting resin by volume ratio.
  • anisotropic magnet powder about 95 to 99% by mass
  • thermosetting resin about 1 to 5% by mass.
  • the additive may be added in an amount of about 0.1 to 0.5% by volume or about 0.2 to 0.5% by mass.
  • the compound can be obtained by, for example, uniformly mixing and mixing these anisotropic magnet powders and thermosetting resin with a kneader.
  • the average particle size of the compound is a particle size including the thermosetting resin, and is preferably 2 12 ⁇ or less.
  • the lower limit of the average particle size varies depending on the composition of the anisotropic magnetic powder, it cannot be specified unconditionally. In the case of N d Fe e ⁇ -based anisotropic magnetic powder, it is better to be 3 ⁇ or more.
  • the pound magnet obtained by the production method of the present invention is not limited in its use, shape, size, magnetic properties and the like.
  • an annular thin pound magnet, an arc-shaped thin pound magnet, or a plate-shaped thin bonded magnet may be used.
  • the orientation or magnetization direction may be any of the longitudinal direction, the lateral direction, the axial direction (axial direction), and the radial direction (radial direction).
  • the size does not matter, a size that enhances the orientation is preferable. For example, in the case of an annular thin pod magnet oriented in the radial direction, if it is long in the axial direction with respect to its diameter, the orientation in the axial direction will vary.
  • the annular thin-walled bonded magnets shortened in the axial direction may be laminated and lengthened in the axial direction.
  • the bonded magnet molded body obtained by the present invention is appropriately magnetized according to the use of the bonded magnet. ⁇
  • the compound used in this example was a mixture of NdFe ⁇ -based coarse powder, which is an anisotropic magnetic powder, and SmFeN-based fine powder in a Henschel mixer, and a thermosetting resin.
  • the epoxy resin powder was added, and the mixture was heated and mixed at 110 ° C by a bumper mixer.
  • the compounding ratios of the NdF eB-based coarse powder, the SmF eN-based fine powder, and the epoxy resin are 78% by mass, 20% by mass, and 2% by mass, respectively.
  • the SmF eN fine powder is present around the Nd Fe B coarse powder, and the SmF eN fine powder and the epoxy resin surround the NdFe B coarse powder. 2004/006013
  • the above NdFeB-based coarse powder and SmFeN-based fine powder were produced as follows.
  • the alloy ingot having the balance of Fe was subjected to d-HDDR treatment. Specifically, first, an alloy ingot (30 kg) having the above composition was melted and manufactured. The ingot was homogenized in an argon gas atmosphere at 1140 to 1150 ° C for 40 hours. Furthermore, the ingot was ground by a jaw crusher into coarse powder having an average particle size of 1 Omm or less. This coarsely pulverized product was subjected to a d-HDDR treatment including a low-temperature hydrogenation step, a high-temperature hydrogenation step, a first exhaustion step, and a second exhaustion step under the following conditions.
  • NdFeB-based anisotropic magnet powder was obtained per batch.
  • the average particle size of the obtained anisotropic magnetic powder was classified by sieving, and the weight of each class was measured to determine the sticking average.
  • the average particle size was 106 ⁇ .
  • the surface of the obtained NdFeB-based anisotropic magnetic powder was coated with a surfactant.
  • the surfactant was coated by adding a surfactant solution to the NdFeB-based anisotropic magnetic powder, stirring the mixture, and drying the mixture under vacuum (coating step).
  • the surfactant solution was prepared by diluting a silane coupling agent (NUC Silicone A-187, manufactured by Nippon Yurika Co., Ltd.) twice with ethanol.
  • NdFeB-based anisotropic magnetic powder coated with this coating is called NdFeB-based coarse powder.
  • SmFeN-based anisotropic magnet powder Surfactant in the same manner as in the case of the NdFeB-based coarse powder.
  • This coated SmFeN-based anisotropic magnet powder is referred to as SmFeN-based fine powder in this embodiment.
  • the average particle size of the SmFeN-based anisotropic magnet powder is 2-3 ⁇ .
  • the weighing and filling step was performed using the first molding device 30 shown in FIG.
  • the upper punch base 38 fixed to the upper end of 6, the lower punch base 39 fixed to the lower end of the lower punch 37, and the upper core 34 and the lower core 35 are pressed close to each other and pressed. It comprises a core drive device 20 and a punch drive device 21 for pressing the upper punch base 38 and the lower punch base 39 in close proximity to each other.
  • the mold temperature is room temperature (30.C) because no heater is provided on the forming die 32 or the like. At least the forming die 32, the lower core 35, and the lower punch 37, which come into contact with the compound when the compound is filled, are at about room temperature. For this reason, the epoxy resin in the compound does not soften at the time of filling, and does not adhere to the wall surfaces 32a and 35a of the cavity C1. Therefore, the compound is smoothly filled into the narrow cavity C1. More specifically, the compound is evenly and uniformly filled into the portions A, B, A, and the like of the cavity C1.
  • the shaped body obtained after the above-mentioned mass filling step was taken out from the cavity C1 of the first molding apparatus 30. Then, the molded body was immersed in the mixed lubricant for 2 seconds.
  • the mixed lubricant used was a solid lubricant and polyalkyl glycol mixed and mixed in a mass ratio of 2:98 in order.
  • the following orientation step was directly performed after the weighing and filling step without performing the lubricant applying step.
  • a solid lubricant ratio of about 1 to 30 can be used.
  • the orientation step was performed using a second molding device 50 shown in FIG.
  • the orienting magnetic field device 40 includes electromagnetic coils 41 and 42 formed so as to face each other in the axial direction with the forming die 52 as a center.
  • the forming die 52, the upper punch 56 and the lower punch 57 are made of a non-magnetic material, and the upper core 54, the lower core 55, the upper punch base 58 and the lower punch base 59 are made of a magnetic material. .
  • the lines of magnetic force emitted from the electromagnetic coils 41 and 42 of the orienting magnetic field device 40 pass through those magnetic materials, change radially from the vicinity of the center of the cavity C2 to the outer peripheral side, and reappear. ⁇ ⁇ Return to each electromagnetic coil 4 1 and 4 2. Due to the formation of this magnetic circuit, a radial magnetic field is formed in the cavity C2, and each magnet powder is radially oriented (see FIG. 5).
  • the molded body impregnated with the mixed lubricant was placed on the cavity C2 of the second molding device 50, and subjected to heating, orientation, and compression molding to produce a preformed body.
  • heating was performed while maintaining the mold temperature: 140 ° C. for 5 seconds.
  • the epoxy resin in the compound became soft and molten.
  • an alignment magnetic field was applied for 3 seconds by the alignment magnetic field device 40.
  • compression molding was performed at 196 MPa to obtain a preform (preliminary molding step).
  • the mold temperature was kept constant at 140 ° C. during each of these steps.
  • the preform was placed on the cavity C3 of the third molding device 70, and was subjected to heat compression molding to produce a pound magnet molded body.
  • This heat compression molding was performed while maintaining the mold temperature: 150 ° C. and the molding pressure: 784 MPa for 5 seconds.
  • the preformed body was further densified, and the epoxy resin was cured, and a pound magnet molded body having high dimensional accuracy was obtained. It took a total of 8 seconds from the transfer of the preformed body to the cavity C3 to the production of the bonded magnet formed body.
  • the third molding die according to the present invention includes a molding die 72, an upper core 74, a lower core 75, an upper punch 76 and a lower punch 77.
  • each molded body was automatically transferred while being held in a cassette.
  • the bonded magnet molded body was placed in a furnace at 150 ° C. for 30 minutes and subjected to a thermosetting treatment.
  • a ring-shaped bonded magnet similar to that of the example was manufactured by two-stage molding described in Patent Document 2 (Japanese Patent Application Laid-Open No. H10-22153), and the magnetic properties were measured. Shown.
  • a compound having a mold temperature of 140 ° C was filled with the compound, and preforming was performed at the same temperature.
  • the same pound magnet as that of the test piece No. 4 was manufactured by setting the mold temperature during the weighing and filling step to 60 ° C.
  • Table 2 shows the results of measuring the magnetic properties.
  • Table 2 also shows test piece No. 4 and test piece No. C4 for comparison.
  • test pieces No. C1 and C2 in the case of a thin-walled bonded magnet having a relative width ratio of 4 or less, the conventional manufacturing method could not form the molding itself.
  • the production method of the present invention was adopted as in the test pieces No. 1 and No. 2 of the examples, the thin pound magnet could be formed without any problem without generating cracks or the like.
  • the variation in magnetic properties was very small.
  • the lubricant application step improves the surface magnetic flux, although the fluctuation width of the surface magnetic flux does not change. It became clear that. By the way, according to the study of the present Kakiakisha, it is clear that the surface magnetic flux is improved by 5 to 10% by performing this lubricant applying step.
  • Bonded magnet outer diameter ⁇ 30mm x inner diameter ⁇ 28mmx height: 20mm (thickness W: 1mm)
  • Average particle size of compound d 0.1mm

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacturing Cores, Coils, And Magnets (AREA)
  • Powder Metallurgy (AREA)

Abstract

L'invention concerne un procédé de production d'un aimant lié caractérisé en ce qu'il consiste à mesurer/placer un composé obtenu à partir d'une poudre magnétique anisotrope et une résine de thermodurcissement dans une cavité dont la température de la paroi ne dépasse pas le point d'adoucissement de la résine de thermodurcissement, à orienter la poudre magnétique anisotrope par application d'un champ magnétique d'alignement simultanément au chauffage du composé mesuré et placé ou de la poudre de composé formant un corps excédant le point d'adoucissement et à chauffer la résine de thermodurcissement pour qu'elle atteigne un état adouci ou fondu, et à lier de manière dense la poudre magnétique anisotrope orientée avec la résine de thermodurcissement pour obtenir un aimant lié formant un corps par formage-thermocompression de la poudre magnétique anisotrope et de la résine de thermodurcissement après l'étape d'orientation. Lors de la mesure et du placement du composé, celui-ci n'adhère pas à la paroi de la cavité et est placé sans à-coups.
PCT/JP2004/006013 2003-05-20 2004-04-26 Procede de production d'un aimant lie WO2004105062A1 (fr)

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JP2003142257A JP3675452B2 (ja) 2003-05-20 2003-05-20 ボンド磁石の製造方法
JP2003-142257 2003-05-20

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Cited By (2)

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US20220059286A1 (en) * 2019-01-14 2022-02-24 Taiyuan Kaiyuan Intelligent Equipment Co., Ltd. Manufacturing method for anisotropic bonded magnet
EP4000766A1 (fr) * 2020-11-24 2022-05-25 Siemens Gamesa Renewable Energy A/S Procédé de fabrication d'un aimant permanent à l'aide d'un moule en matériau magnétique

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KR100642218B1 (ko) 2005-02-23 2006-11-03 (주)대한특수금속 희토류계 자석 제조용 자장 프레스 장치
CN101593590B (zh) * 2009-04-10 2012-03-28 华中科技大学 一种温压成型酚醛树脂粘结Nd-Fe-B磁体的制备方法
JP6608643B2 (ja) * 2015-07-31 2019-11-20 日立化成株式会社 Ｎｄ−Ｆｅ−Ｂ系ボンド磁石用樹脂コンパウンド、Ｎｄ−Ｆｅ−Ｂ系ボンド磁石及びその製造方法
JP7461852B2 (ja) * 2020-10-22 2024-04-04 株式会社デンソー ボンド磁石の製造方法
WO2024028989A1 (fr) * 2022-08-02 2024-02-08 愛知製鋼株式会社 Préforme, procédé de préformage et procédé de production d'aimant lié par compression

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JPH09129465A (ja) * 1995-10-30 1997-05-16 Daido Steel Co Ltd Ｎｄ−Ｆｅ−Ｂ系磁石の製造方法
JPH09312230A (ja) * 1996-03-19 1997-12-02 Sumitomo Special Metals Co Ltd 異方性ボンド磁石の製造方法
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JP2003059030A (ja) * 2001-08-20 2003-02-28 Fuji Photo Film Co Ltd 六方晶系フェライト粉末及びそれを含む磁気記録媒体
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20220059286A1 (en) * 2019-01-14 2022-02-24 Taiyuan Kaiyuan Intelligent Equipment Co., Ltd. Manufacturing method for anisotropic bonded magnet
EP4000766A1 (fr) * 2020-11-24 2022-05-25 Siemens Gamesa Renewable Energy A/S Procédé de fabrication d'un aimant permanent à l'aide d'un moule en matériau magnétique
WO2022111876A1 (fr) * 2020-11-24 2022-06-02 Siemens Gamesa Renewable Energy A/S Procédé de fabrication d'un aimant permanent à l'aide d'un moule en matériau magnétique

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