WO2014080852A1 - Méthode de fabrication d'aimant en terre rare - Google Patents

Méthode de fabrication d'aimant en terre rare Download PDF

Info

Publication number
WO2014080852A1
WO2014080852A1 PCT/JP2013/080974 JP2013080974W WO2014080852A1 WO 2014080852 A1 WO2014080852 A1 WO 2014080852A1 JP 2013080974 W JP2013080974 W JP 2013080974W WO 2014080852 A1 WO2014080852 A1 WO 2014080852A1
Authority
WO
WIPO (PCT)
Prior art keywords
punch
molded body
die
magnet
mold
Prior art date
Application number
PCT/JP2013/080974
Other languages
English (en)
Japanese (ja)
Inventor
大 小淵
伸也 西ヶ谷
祐介 横田
彰 加納
Original Assignee
トヨタ自動車株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by トヨタ自動車株式会社 filed Critical トヨタ自動車株式会社
Publication of WO2014080852A1 publication Critical patent/WO2014080852A1/fr

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/12—Both compacting and sintering
    • B22F3/14—Both compacting and sintering simultaneously
    • 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
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C2202/00—Physical properties
    • C22C2202/02—Magnetic
    • 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
    • H01F1/047—Alloys characterised by their composition
    • H01F1/053—Alloys characterised by their composition containing rare earth metals
    • H01F1/055—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5
    • H01F1/057—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B
    • H01F1/0571—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes
    • H01F1/0575—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes pressed, sintered or bonded together
    • H01F1/0576—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes pressed, sintered or bonded together pressed, e.g. hot working

Definitions

  • the present invention relates to a method for producing a rare earth magnet that is an oriented magnet by hot plastic working.
  • Rare earth magnets using rare earth elements such as lanthanoids are also called permanent magnets, and their uses are used in motors for driving hard disks and MRIs, as well as drive motors for hybrid vehicles and electric vehicles.
  • Residual magnetization residual magnetic flux density
  • coercive force can be cited as indicators of the magnet performance of this rare earth magnet.
  • Residual magnetization residual magnetic flux density
  • coercive force can be cited as indicators of the magnet performance of this rare earth magnet.
  • rare earth magnets used in response to increased heat generation due to miniaturization of motors and higher current density, rare earth magnets used also The demand for heat resistance is further increasing, and how to maintain the magnetic properties of the magnet under high temperature use is one of the important research subjects in the technical field.
  • An outline of an example of a method for producing a rare earth magnet is as follows. For example, a fine powder obtained by rapid solidification of a Nd-Fe-B metal melt is formed into a compact while being pressed, and the magnetic anisotropy is applied to the compact. In general, a method of producing a rare earth magnet (orientated magnet) by performing hot plastic working to impart the above-mentioned properties is applied.
  • a compact is disposed between a lower die constituting a plastic working die and a punch (also referred to as a punch), and pressed with the lower die and the punch for a short time of about 1 second or less while being heated.
  • a punch also referred to as a punch
  • upsetting that presses until a predetermined processing rate is achieved is applied.
  • this hot plastic working can give magnetic anisotropy to the molded body
  • the molded body is plastically deformed in the process of being crushed while being plastically deformed by the lower die and the press by the punch during the hot plastic working.
  • cracks including fine cracks
  • Patent Document 1 a manufacturing method disclosed in Patent Document 1 can be cited as a prior art that can solve the problem of cracking during such hot plastic working.
  • this manufacturing method the whole molded body is encapsulated in a metal capsule, and then hot plastic working is performed while pressing the metal capsule with a lower mold and a punch. It is said that the magnetic anisotropy of the material will be further improved.
  • Patent Documents 2 to 5 disclose other techniques for performing hot plastic working in a state where a molded body is sealed in a metal capsule.
  • the upper surface region and the lower surface region corresponding to the upper surface and the lower surface of the molded body integrated with the side surface region are constrained by restraining the spread of the side surface region.
  • Patent Document 6 discloses a technique for thinning a metal capsule by forging in multiple stages, but the disclosed embodiment uses an iron plate having a thickness of 7 mm or more.
  • the magnet shape after forging cannot be said to be a near net shape, and finishing work is absolutely necessary, resulting in a decrease in material yield and an increase in processing costs. Becomes prominent.
  • FIG. 11a shows an analysis model of a molded body sandwiched between a punch and a lower mold before upsetting (the model is an assembly of a large number of element cells when performing finite element analysis by a computer.
  • FIG. 11b shows a state of deformation of the analytical model after upsetting with a processing rate of 50%. Note that the analysis model shown is a model of only the right cross section because the analysis results are the same on the left and right sides of the compact.
  • JP-A-2-250920 Japanese Patent Laid-Open No. 2-250922 JP-A-2-250919 JP-A-2-250918 JP-A-4-04301 JP-A-4-134804
  • the present invention has been made in view of the above-described problems, and in producing a rare earth magnet that is an oriented magnet by performing hot plastic processing that is upsetting processing on a molded body, without causing cracks in the molded body, Moreover, it is an object of the present invention to provide a method for producing a rare earth magnet in which the orientation disorder of the crystal structure does not occur due to the shear frictional force acting from the punch or the lower mold when the compact is laterally deformed.
  • a method for producing a rare earth magnet comprises a first step of producing a columnar shaped body by pressure-molding a powder as a rare earth magnet material, and a cavity in which the shaped body is accommodated.
  • a plastic working die comprising a die provided with a punch slidable in the cavity is prepared, and the cavity has a cross section having a larger cross-sectional dimension than a cross section perpendicular to the pressing direction of the molded body by the punch.
  • the molded body is accommodated in the cavity and sandwiched between the lower die of the die and the punch, and hot plastic working is performed to give anisotropy while directly pressing the upper surface and the lower surface of the molded body with the punch and the lower die.
  • the second step of manufacturing a rare earth magnet as an orientation magnet is composed of two steps.
  • the first step A the lower die and the punch are pressed.
  • the side of the molded body which is the free end face that is not pressed by the lower mold and the punch, protrudes to the side and is pressed from the side mold of the die on the side of the molded body, and the processing rate necessary for imparting anisotropy
  • the next step B the side face of the oriented magnet precursor is not pressed from the side face mold of the die.
  • the magnet is returned to the free end face and pressed with a lower die and a punch until a processing rate necessary for imparting anisotropy is reached to produce an oriented magnet.
  • the manufacturing method of the rare earth magnet of the present invention is divided into two or more stages before reaching the desired processing rate instead of performing hot plastic processing to the desired processing rate by pressing once with a punch during upsetting.
  • This is a method of performing hot plastic working.
  • the side of the molded body is in a free state (free end surface) before the hot plastic working, and the molded body is moved to the stage before the desired processing rate is reached.
  • the side surface is pressed by a side surface mold of a die.
  • the molded body undergoes compositional deformation and its side surface deforms to the side.
  • the side surface of the die contacts the die, and the side surface of the molded body is pressed from the side surface die of the die by further pressing. Will be.
  • a correction force is applied to the sheared friction force that counteracts the shear frictional force that the molded body receives from the punch and the lower mold in the direction opposite to the lateral deformation direction.
  • the resulting disorder in the orientation of the crystal structure can be eliminated.
  • the molded body pressed by the punch is constrained from the side surface mold of the die after being deformed to the side freely in Step A in which the plastic deformation is performed to the previous stage where the desired processing rate is obtained.
  • the problem of occurrence of cracks in the case of the conventional manufacturing method in which a desired processing rate can be obtained by one hot plastic working and the side surface of the molded body is always free is effectively solved.
  • Step A which comprises this step once
  • Step B an oriented magnet (rare earth magnet) is manufactured.
  • the oriented magnet is manufactured by moving to step B after executing step A twice or more.
  • the side surface die of the die which is a constituent element thereof is configured to be separable or movable, and step A of the second step is completed.
  • the side surface mold can be separated or moved so as to be separated from the side surface of the oriented magnet precursor and form a space on the side of the side surface.
  • step A when step A is repeated 5 times and then the process proceeds to step B to produce an oriented magnet, the side surface mold of the die is gradually slid to the side and fixed after each step A is completed. Step A may be executed.
  • the rare earth magnets to be produced by the production method of the present invention include not only nanocrystalline magnets having a grain size of the main phase (crystal) constituting the structure of about 200 nm or less, but also those having a grain size of 300 nm or more. Furthermore, a sintered magnet having a grain size of 1 ⁇ m or more, a bonded magnet in which crystal grains are bonded with a resin binder, and the like are included.
  • a rapidly cooled ribbon which is a fine crystal grain, is manufactured by liquid quenching, and this is coarsely pulverized to produce magnetic powder for a rare earth magnet.
  • An isotropic molded body can be obtained by filling and sintering while pressing with a punch to achieve bulking.
  • This molded body is, for example, a RE-Fe-B main phase with a nanocrystalline structure (RE: at least one of Nd and Pr, more specifically one or more of Nd, Pr and Nd-Pr. ) And a grain boundary phase of the RE-X alloy (X: metal element) around the main phase.
  • RE nanocrystalline structure
  • X metal element
  • the oriented magnet manufactured in the second step diffuses modified alloys such as Nd-Cu alloy, Nd-Al alloy, Pr-Cu alloy, Pr-Al alloy, etc. at the grain boundary to further increase the coercive force. It may be an enhanced rare earth magnet.
  • the eutectic point of Nd-Cu alloy is about 520 ° C
  • the eutectic point of Pr-Cu alloy is about 480 ° C
  • the eutectic point of Nd-Al alloy is about 640 ° C
  • the eutectic point of Pr-Al alloy is 650 ° C. All of them are well below 700 ° C. to 1000 ° C., which causes coarsening of crystal grains constituting the nanocrystalline magnet, and are particularly suitable when the rare earth magnet is a nanocrystalline magnet.
  • the hot plastic working is performed from at least two steps.
  • the side surface of the molded body which is a free end surface that is not pressed by the lower die and the punch, is pressed from the side surface die of the die by pressing with the lower die and the punch, and processing necessary for imparting anisotropy
  • the oriented magnet precursor is manufactured by performing pressing with the punch and the lower die until the stage before reaching the rate, and in the next step B, the side surface of the oriented magnet precursor is changed to a free end surface without pressure from the side surface die of the die.
  • the oriented magnet is manufactured by performing pressing with the lower die and the punch until the processing rate necessary for imparting anisotropy is reached.
  • this manufacturing method it is possible to apply a correction force to the molded body that counteracts the shear frictional force that the molded body receives from the punch and the lower mold in the direction opposite to the lateral deformation direction. It is possible to eliminate the disorder of the orientation of the crystal structure caused by the deformation and to suppress the occurrence of cracks during hot plastic working, and to produce rare earth magnets with high remanence due to high degree of orientation at a high material yield. be able to.
  • FIG. 8 is a flow diagram simulating the change of the metal structure from before the hot plastic working to the end of the hot plastic working in the portion VIII in Example 1 of FIG. 7. It is the figure which showed the analysis result regarding the relationship between a friction coefficient and material yield. It is the figure which showed the analysis result regarding the relationship between the processing rate in step A of a 2nd step, and material yield.
  • (A) is the figure which showed the analysis model of the molded object pinched
  • (b) is an installation model with a processing rate of 50%. It is the figure which showed the deformation
  • the manufacturing method shown in the figure is one in which step A is followed by step B to manufacture an oriented magnet, but step A is executed twice or more and then step B is executed. Then, a method of manufacturing an oriented magnet may be used.
  • the illustrated oriented magnet is a nanocrystalline magnet (particle size is about 300 nm or less)
  • the oriented magnet targeted by the manufacturing method of the present invention is limited to a nanocrystalline magnet. These include, but not limited to, those having a particle size of 300 nm or more, sintered magnets of 1 ⁇ m or more, and bonded magnets in which crystal grains are bound with a resin binder.
  • FIGS. 1a and 1b are schematic views illustrating the first step of the method of manufacturing a rare earth magnet of the present invention in that order
  • FIG. 2 is a view illustrating the microstructure of the molded body manufactured in the first step. is there.
  • FIG. 3 is a schematic diagram illustrating a plastic working die used in the second step of the manufacturing method of the present invention.
  • FIG. 4 illustrates step A of the second step in the order of FIGS. 4a and 4b.
  • FIG. 5 is a flowchart illustrating step B of the second step in the order of FIGS. 5a and 5b.
  • FIG. 6 is a diagram illustrating the microstructure of the manufactured oriented magnet (rare earth magnet) of the present invention.
  • an alloy ingot is melted at a high frequency by a melt spinning method using a single roll in a furnace (not shown) in an Ar gas atmosphere whose pressure is reduced to 50 kPa or less.
  • a quenched ribbon B quenched ribbon
  • a quenched ribbon B having a maximum dimension of about 200 nm or less is selected, and this is shown in FIG. Fill the cavity defined by the hard punch P. Then, while applying pressure with the carbide punch P (X direction), current is applied in the pressing direction to heat and heat, so that the main phase of the Nd-Fe-B system with a nanocrystal structure (crystal grain size of about 50 nm to 200 nm) And a columnar shaped body S composed of a grain boundary phase of an Nd—X alloy (X: metal element) around the main phase (first step).
  • X Nd—X alloy
  • the Nd—X alloy constituting the grain boundary phase is made of Nd and at least one alloy of Co, Fe, Ga, etc., for example, Nd—Co, Nd—Fe, Nd—Ga, One of Nd-Co-Fe and Nd-Co-Fe-Ga, or a mixture of two or more of these, is in an Nd-rich state.
  • the compact S exhibits an isotropic crystal structure in which the grain boundary phase BP is filled between the nanocrystalline grains MP (main phase).
  • the shaped body S is transferred to the cavity Ca of the plastic working die 10 shown in FIG. 3, and hot plastic working which is upsetting is performed here.
  • the plastic working die 10 includes a die 2 and a punch 2 that directly presses the formed body S.
  • the die 1 has a box shape, and includes a lower die 1a, side dies 1b, and 1d.
  • a side surface mold 1c partition mold that divides the cavity Ca defined by the molds 1b and 1d into two is housed.
  • the side surface mold 1c is slidable laterally, is slid to a desired position, is positioned, and is temporarily fixed.
  • FIG. 4 is a diagram illustrating step A of the second step
  • FIG. 5 is a diagram illustrating step B of the second step after FIG.
  • step A of the second step shown in FIG. 4 upsetting (thermal) is performed up to a processing rate (for example, 40%) of the previous stage out of a desired processing rate (for example, 80%) necessary for imparting anisotropy.
  • a processing rate for example, 40%
  • a desired processing rate for example, 80%
  • the hot plastic working is executed until a desired working rate is obtained.
  • a space G is formed between one side surface Sc of the molded body S and the side surface mold 1c, and thus the side surface Sc of the molded body S is a free end surface. Yes.
  • the air existing in the space G can be deaerated through an air vent hole (not shown).
  • the formed body S is pressed in the vertical direction by the punch 2 with the pressing force P1.
  • the shaped body S When the shaped body S is pressed in the vertical direction by the punch 2, the shaped body S is deformed to the side as shown in FIG. 4b to become the oriented magnet precursor S ', and the space G that was on the side of the side surface Sc becomes the oriented magnet. The state is filled with the precursor S ′.
  • the upper surface S′a and the lower surface S′b of the oriented magnet precursor S ′ that is plastically deformed are pressed by the punch 2 and the lower mold 1a, and the side surface S′c. Is pushed by receiving pressure P2 from the side mold 1c, and therefore the side S′c is no longer a free end face.
  • the pressing is finished up to the processing rate of the previous stage of the desired processing rate, and the side surface Sc that is the free end surface of the molded body S that is plastically deformed at this stage is restrained, and further, a pressing force is applied, A forcing force is applied to the molded body in a direction that cancels the shear frictional force acting on the molded body from the punch or lower mold described in FIG. 11, and orientation disorder occurs in the crystalline structure of the molded body during upsetting.
  • the problem of the occurrence of the problem is solved.
  • the side surface is restrained appropriately during plastic deformation of the molded body, the problem of cracks occurring in the molded body during hot plastic working is effectively eliminated. Details of the elimination of the shear frictional force will be described later.
  • Step B of the second step First, as shown in FIG. 5a, the side surface mold 1c existing in the cavity Ca is removed, and the punch to be used is replaced with a punch 2A having the same area and the same shape as the lower mold 1a of the die 1. At 2A, the oriented magnet precursor S ′ is pressed in the vertical direction with the pressing force P3.
  • the oriented magnet precursor S ′ When the oriented magnet precursor S ′ is pressed in the vertical direction by the punch 2A, the oriented magnet precursor S ′ is deformed laterally as shown in FIG. 5B, and is oriented by pressing with the punch 2A until a desired processing rate is obtained.
  • the space G that was on the side of the magnet precursor S ′ is filled with the orientation magnet C, and the orientation magnet C is manufactured.
  • the oriented magnet C manufactured by the two-step hot plastic working of steps A and B has a flat nanocrystal grain MP, and the interface substantially parallel to the anisotropic axis is curved or bent.
  • the oriented magnet C is excellent in magnetic anisotropy.
  • the hot plastic working is finished once to produce an oriented magnet precursor, and the side face is restrained from the middle of plastic deformation in the production of this oriented magnet precursor.
  • Example 1 the upper and lower surfaces of the molded body that was plastically deformed as in Comparative Example 1 were subjected to shear frictional force from the punch and the lower mold, but the side surface of the molded body was pressurized from the side mold, A correction force that cancels the shear friction force is applied by the pressure.
  • Example 1 the part VIII is taken as a region where the influence of the shear friction force is large, and the deformation, movement and orientation change of the main phase during the hot plastic working in the part VIII are shown as a flow diagram in FIG.
  • the main phase is deformed laterally during the hot plastic working and becomes flat, the main phase is rotated by the shear friction force acting from the punch, and the orientation of the main phase is also dragged in the direction of this shear friction force.
  • a correction force is applied to cancel the shear frictional force, and the orientation is returned to the vertical direction while the main phase rotates.
  • distortion is corrected in the direction of easy magnetization, and the oriented magnet has an orientation degree substantially aligned in the vertical direction.
  • the present inventors further provide an oriented magnet (Comparative Example 2) when the hot plastic working is performed up to a predetermined working rate in one hot plastic working without constraining the side surface of the molded body, the second step.
  • an oriented magnet according to the manufacturing method of the present invention consisting of two-step molding of steps A and B (Example 2), and the second step is a six-step molding of step A and the next step B of seven steps
  • CAE analysis was performed to identify the material yield when changing the coefficient of friction between the compact, the punch and the lower die.
  • the present inventors further relate to an oriented magnet according to the manufacturing method of the present invention when the second step comprises two-step molding of steps A and B, and the friction coefficient between the molded body, the punch and the lower mold is changed. Then, CAE analysis was performed to identify the material yield when changing the processing rate in Step A.

Landscapes

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

Abstract

L'invention concerne une méthode de fabrication d'un aimant en terre rare, qui est un aimant à orientation, en soumettant un comprimé à une déformation plastique à chaud, dans laquelle des fissures ne se forment pas dans le comprimé et dans laquelle il n'y a pas de perturbation d'orientation à cause de la force de frottement de cisaillement appliquée par un poinçon ou un élément similaire lors de la déformation latérale du comprimé. La méthode comprend : une première étape permettant de fabriquer un comprimé (S) ; et une deuxième étape permettant de fabriquer un aimant en terre rare (C), qui est un aimant à orientation, en préparant un moule de déformation plastique (10) comprenant une matrice (1) et un poinçon (2), en plaçant le comprimé (S) dans une cavité (Ca) du moule (10), et en soumettant le comprimé (S) à une déformation plastique à chaud. La deuxième étape est constituée des étapes (A) et (B). L'étape (A) consiste à : provoquer la saillie latérale d'une surface latérale du comprimé (S), qui est une face d'extrémité libre, à cause de la pression du poinçon (2) ; appliquer une pression à la surface latérale à partir d'un moule de surface latérale (1c) ; et continuer l'application de la pression jusqu'à une étape préliminaire où le taux de déformation nécessaire pour donner des propriétés anisotropes est atteint, afin de fabriquer un précurseur d'aimant à orientation (S'). L'étape (B) consiste à ramener la surface latérale du précurseur d'aimant à orientation (S') au niveau de la face d'extrémité libre et continuer l'application de pression jusqu'à atteindre le taux de déformation nécessaire pour donner des propriétés anisotropes, pour fabriquer l'aimant à orientation (C).
PCT/JP2013/080974 2012-11-20 2013-11-18 Méthode de fabrication d'aimant en terre rare WO2014080852A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2012254302A JP2014103251A (ja) 2012-11-20 2012-11-20 希土類磁石の製造方法
JP2012-254302 2012-11-20

Publications (1)

Publication Number Publication Date
WO2014080852A1 true WO2014080852A1 (fr) 2014-05-30

Family

ID=50776035

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2013/080974 WO2014080852A1 (fr) 2012-11-20 2013-11-18 Méthode de fabrication d'aimant en terre rare

Country Status (2)

Country Link
JP (1) JP2014103251A (fr)
WO (1) WO2014080852A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6287684B2 (ja) * 2014-08-20 2018-03-07 トヨタ自動車株式会社 希土類磁石の製造方法
JP6112084B2 (ja) * 2014-08-28 2017-04-12 トヨタ自動車株式会社 希土類磁石の製造方法
JP6358085B2 (ja) * 2014-12-26 2018-07-18 トヨタ自動車株式会社 希土類磁石の磁気性能の特定方法
WO2017209332A1 (fr) 2016-05-30 2017-12-07 성림첨단산업(주) Procédé de fabrication d'aimant de terre rare

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02238611A (ja) * 1989-03-11 1990-09-20 Nippon Steel Corp 希土類磁石の製造方法
JPH046811A (ja) * 1990-04-24 1992-01-10 Hitachi Metals Ltd 希土類磁石の製造装置
JPH10284314A (ja) * 1997-04-10 1998-10-23 Masato Sagawa 磁心材料
JP2003086413A (ja) * 2001-06-28 2003-03-20 Sumitomo Special Metals Co Ltd 鉄基永久磁石およびその製造方法
JP2008505500A (ja) * 2004-06-30 2008-02-21 ユニバーシティ・オブ・デイトン 異方性ナノコンポジット希土類永久磁石とそれらの製造方法
JP2012044021A (ja) * 2010-08-20 2012-03-01 Toyota Motor Corp 異方性磁石の製造方法
JP2013098485A (ja) * 2011-11-04 2013-05-20 Toyota Motor Corp 希土類磁石の製造装置と製造方法
JP2013098486A (ja) * 2011-11-04 2013-05-20 Toyota Motor Corp 希土類磁石の製造方法

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02238611A (ja) * 1989-03-11 1990-09-20 Nippon Steel Corp 希土類磁石の製造方法
JPH046811A (ja) * 1990-04-24 1992-01-10 Hitachi Metals Ltd 希土類磁石の製造装置
JPH10284314A (ja) * 1997-04-10 1998-10-23 Masato Sagawa 磁心材料
JP2003086413A (ja) * 2001-06-28 2003-03-20 Sumitomo Special Metals Co Ltd 鉄基永久磁石およびその製造方法
JP2008505500A (ja) * 2004-06-30 2008-02-21 ユニバーシティ・オブ・デイトン 異方性ナノコンポジット希土類永久磁石とそれらの製造方法
JP2012044021A (ja) * 2010-08-20 2012-03-01 Toyota Motor Corp 異方性磁石の製造方法
JP2013098485A (ja) * 2011-11-04 2013-05-20 Toyota Motor Corp 希土類磁石の製造装置と製造方法
JP2013098486A (ja) * 2011-11-04 2013-05-20 Toyota Motor Corp 希土類磁石の製造方法

Also Published As

Publication number Publication date
JP2014103251A (ja) 2014-06-05

Similar Documents

Publication Publication Date Title
CA2887984C (fr) Procede de production d'un aimant en terre rare
US9859055B2 (en) Manufacturing method for rare-earth magnet
WO2014080852A1 (fr) Méthode de fabrication d'aimant en terre rare
KR101813427B1 (ko) 희토류 자석의 제조 방법
JP5786708B2 (ja) 希土類磁石の製造方法
JP6102881B2 (ja) 希土類磁石の製造方法
KR20160041790A (ko) 희토류 자석의 제조 방법
JP5704186B2 (ja) 希土類磁石の製造方法
JP6036648B2 (ja) 希土類磁石の製造方法
CN108242334B (zh) 稀土磁铁的制造方法
JP6354684B2 (ja) 塑性加工方法
JP6287684B2 (ja) 希土類磁石の製造方法
JP2015123463A (ja) 前方押出し鍛造装置と前方押出し鍛造方法
JP2013138111A (ja) 希土類磁石の製造方法

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 13857190

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 13857190

Country of ref document: EP

Kind code of ref document: A1