KR100631183B1 - A Manufacture Method of NdFeB Anisotropic permanent Magnets - Google Patents

A Manufacture Method of NdFeB Anisotropic permanent Magnets Download PDF

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KR100631183B1
KR100631183B1 KR1020040086816A KR20040086816A KR100631183B1 KR 100631183 B1 KR100631183 B1 KR 100631183B1 KR 1020040086816 A KR1020040086816 A KR 1020040086816A KR 20040086816 A KR20040086816 A KR 20040086816A KR 100631183 B1 KR100631183 B1 KR 100631183B1
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permanent magnet
molded body
isotropic
lower punches
ndfeb
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KR1020040086816A
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Korean (ko)
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KR20060037764A (en
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김윤배
손장석
전주원
김형태
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주식회사 테슬라
김형태
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Priority to KR1020040086816A priority Critical patent/KR100631183B1/en
Priority to US11/718,312 priority patent/US20090060773A1/en
Priority to PCT/KR2005/003608 priority patent/WO2006046838A1/en
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    • 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
    • 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
    • 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
    • H01F41/0266—Moulding; Pressing
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/02—Permanent magnets [PM]

Abstract

본 발명은 NdFeB계 이방성 영구자석을 제조시 외부에 별도의 발열체나 고주파 코일등을 설치할 필요 없이, 등방성 영구자석 성형체을 상부 및 하부펀치로 가압 성형전에, 상기 상,하부 펀치에 직접 전류를 가하여 등방성 영구자석 성형체에 직접적으로 직류 전류를 통하게 하여 등방성 영구자석 성형체의 자체 저항에 의한 주울 열에 의해 NdFeB계 이방성 영구자석을 손쉽고, 용이하게 제조할 수 있도록 함은 물론, 상기 이방성 영구자석의 제조시 간편한 구조에 의해 제작 비용이 저렴하게 이루어질 수 있는 NdFeB계 이방성 영구자석의 제조방법에 관한 것이다.According to the present invention, there is no need to install a separate heating element or a high frequency coil to the outside when manufacturing an NdFeB-based anisotropic permanent magnet, and isotropic permanent by applying a current directly to the upper and lower punches before pressing the isotropic permanent magnet molded body with upper and lower punches. The direct current flows directly through the magnet molded body to allow easy and easy manufacture of the NdFeB-based anisotropic permanent magnet by Joule heat caused by the self-resistance of the isotropic permanent magnet molded body, as well as a simple structure in manufacturing the anisotropic permanent magnet. The present invention relates to a method for producing an NdFeB-based anisotropic permanent magnet that can be made cheap by manufacturing.

그 기술적인 구성은, 상부 및 하부펀치에 직류 전류를 500~3000A/㎠로 인가하여 등방성 영구자석의 성형체의 내부에 저항열이 700~800℃가 되도록 열을 발생시킨 후, 상기 상부 및 하부펀치를 50~200MPa 압력을 가압하여, 상기 등방성 영구자석 성형체가 가압방향으로 수축함과 동시에 가압방향의 수직 방향으로 팽창된 상태로 소성 변형되는 것을 요지로 한다.The technical configuration is to apply a direct current to the upper and lower punches of 500 ~ 3000A / ㎠ to generate heat to form a heat resistance of 700 ~ 800 ℃ inside the molded body of the isotropic permanent magnet, the upper and lower punches By pressing a pressure of 50 ~ 200MPa, the isotropic permanent magnet molded body shrinkage in the pressing direction and at the same time plastic deformation in the expanded state in the vertical direction of the pressing direction.

등방성 영구자석 성형체, 상부펀치, 하부펀치, 전기장치, 이방성 영구자석Isotropic permanent magnet molded body, upper punch, lower punch, electric device, anisotropic permanent magnet

Description

ＮｄＦｅＢ계 이방성 영구자석의 제조방법{A Manufacture Method of NdFeB Anisotropic permanent Magnets}Manufacture method of NdFeB Anisotropic permanent Magnets

도 1은 일반적인 고온 프레스(hot press)공정에 의한 영구자석의 제조 공정도.1 is a manufacturing process diagram of a permanent magnet by a general hot press (hot press) process.

도 2는 일반적인 고온 변형(hot deformation)에 의한 영구자석의 제조 공정도.2 is a manufacturing process diagram of a permanent magnet by hot deformation in general.

도 3은 종래 전류 통전에 의한 영구자석의 제조 공정도.3 is a manufacturing process diagram of a permanent magnet by a conventional current supply.

도 4는 본 발명에 따른 NdFeB 이방성 영구자석의 제조방법을 설명하기 위한 개략 공정도.Figure 4 is a schematic process diagram for explaining the manufacturing method of NdFeB anisotropic permanent magnet according to the present invention.

* 도면의 주요부분에 대한 부호의 설명 *Explanation of symbols on the main parts of the drawings

110...등방성 영구자석 성형체 120...NdFeB계 이방성 영구자석110 ... Isotropic permanent magnet molded body 120 ... NdFeB-based anisotropic permanent magnet

130...상부펀치 140...하부펀치130 Top Punch 140 Bottom Punch

150...전기장치 150 ... Electrical

본 발명은 NdFeB계 이방성 영구자석의 제조방법에 관한 것으로 이는 특히, 등방성 영구자석 성형체를 상부 및 하부펀치 사이에 밀착시켜 고정시키며, 상기 상부 및 하부펀치에 직류 전류를 인가하여 등방성 영구자석의 성형체를 가열킨 후,상기 상부 및 하부펀치로 가압시켜 상기 영구자석 성형체가 가압방향으로 수축함과 동시에 가압방향의 수직 방향으로 팽창된 상태로 소성 변형시켜 NdFeB계 이방성 영구자석을 제조함으로써, 상기 NdFeB계 이방성 영구자석을 제조시 외부에 별도의 발열체나 고주파 코일등을 설치할 필요 없이, 등방성 영구자석 성형체을 상부 및 하부펀치로 가압 성형전에, 상기 상,하부 펀치에 직접 전류를 가하여 등방성 영구자석 성형체에 직접적으로 직류 전류를 통하게 하여 등방성 영구자석 성형체의 자체 저항에 의한 주울 열에 의해 NdFeB계 이방성 영구자석을 손쉽고, 용이하게 제조할 수 있도록 함은 물론, 상기 이방성 영구자석의 제조시 간편한 구조에 의해 제작 비용이 저렴하게 이루어질 수 있도록한 NdFeB계 이방성 영구자석의 제조방법에 관한 것이다.The present invention relates to a method for producing an NdFeB-based anisotropic permanent magnet, in particular, the isotropic permanent magnet molded body tightly fixed between the upper and lower punches, by applying a direct current to the upper and lower punches to form a molded body of the isotropic permanent magnet After heating and pressurizing the upper and lower punches, the permanent magnet molded body contracts in the pressing direction and plastic deformation in an expanded state in the vertical direction of the pressing direction to produce an NdFeB-based anisotropic permanent magnet, thereby producing the NdFeB-based anisotropic When manufacturing permanent magnets, there is no need to install a separate heating element or high frequency coil on the outside, and the direct current is applied directly to the isotropic permanent magnet molded body by applying a current directly to the upper and lower punches before press molding the isotropic permanent magnet molded body with the upper and lower punches. Through the electric current, the Joule heat caused by the self-resistance of the isotropic permanent magnet molded body The present invention relates to a method of manufacturing an NdFeB-based anisotropic permanent magnet, which enables easy and easy manufacture of an NdFeB-based anisotropic permanent magnet, and also enables manufacturing cost to be low by a simple structure in manufacturing the anisotropic permanent magnet. .

일반적으로 영구자석을 제조하는 경우 도 1에 도시한 바와같이, 등방성 자석을 만드는 고온 프레스(hot press)공정과, 이렇게 제조된 등방성 영구자석을 고온에서 압축, 변형하여 이방성 자석(20)을 제조하는 고온 변형(hot deformation) 과정은 통상 700℃ 정도의 고온과 1 ton/㎠ 이상의 고압 상태에서 행하여 지는 관계로, 분말(10)이 장입된 용기 내부에 발열 코일(40)을 감아 온도를 올리거나, 또는 몰드 주변에 고주파 코일(40)을 설치하여, 원하는 온도환경을 만들고 고압이 가해져야 하기 때문에 강도가 작은 흑연 재질의 몰드를 사용하기가 극히 제한적이며, 또한 특수 재질의 성형 보조체를 사용한다는 것은 불가능하게 됨으로써, 금속이나 세라믹 재질을 사용하게 되며, 또한 몰드가 손상될 경우 몰드를 대체하는 비용이 많이 들고 원하는 모양의 제품을 만들기 위해서는 제품완성 후 가공단계가 필수적으로 요망되는 단점이 있는 것이다.In general, when manufacturing a permanent magnet, as shown in Figure 1, the hot press (hot press) process for making isotropic magnets, and the isotropic permanent magnets are compressed and deformed at a high temperature to produce the anisotropic magnet 20 Since the hot deformation process is usually performed at a high temperature of about 700 ° C. and a high pressure of 1 ton / cm 2 or more, the heating coil 40 is wound around the inside of the container in which the powder 10 is charged to raise the temperature, Alternatively, since the high frequency coil 40 is installed around the mold to create a desired temperature environment and high pressure must be applied, it is extremely limited to use a mold made of graphite having low strength, and using a molding aid made of a special material. By not being able to do this, they use metal or ceramic materials, and if the mold is damaged, it is expensive to replace the mold and produce a product of the desired shape. In order to have the disadvantage that the processing step is required after the completion of the product.

한편, 상기와같은 종래의 문제점들을 개선하기 위하여 본 발명자는 외부의 발열체나 고주파 코일을 이용하지 않고, 자석 분말을 가압 성형시 전기적인 장치에 의해 영구자석 분말이나 영구자석 성형체에 직접적으로 직류전류를 통하게 함으로써, 분말과 몰드 자체의 저항에 의한 주울 열에 의해 영구자석을 제조하는 방법을 제안하여 등록받은바 있다.On the other hand, in order to improve the conventional problems as described above, the present inventors do not use an external heating element or a high-frequency coil, the direct current is applied directly to the permanent magnet powder or the permanent magnet molded body by an electrical device when pressing the magnetic powder By making it pass through, it has been proposed and registered a method of manufacturing permanent magnets by joule heat caused by the resistance of powder and mold itself.

즉, 대한민국 등록 특허공보 제 10-0424142호에 의하면 도 3에 도시한 바와같이, 희토류계 영구자석 분말(1)을 몰드에 장입하고 상, 하부 펀치(2)(3)로 50∼150 MPa 압력을 가함과 동시에 전기적인 장치(4)에 의하여 상, 하 펀치를 통하여 450∼4000 A/㎠ 직류전류를 통하게 하여 분말로부터 벌크 상태의 영구자석(5)을 얻는 것이다.That is, according to the Republic of Korea Patent Publication No. 10-0424142, as shown in Figure 3, the rare earth-based permanent magnet powder (1) is charged into the mold and pressure 50 to 150 MPa with the upper and lower punches (2) (3) At the same time, the bulky permanent magnet 5 is obtained from the powder by an electric device 4 through 450-4000 A / cm 2 direct current through the upper and lower punches.

그러나, 몰드에 장입된 분말(1)을 상,하부 펀치(2)(3)에 의해 일정 압력으로 압력을 가함과 동시에 전류를 인가시, 가압 방향과 수직으로 팽창되는 영구자석 분말은 소성 변형온도가 이루어지기 이전에 몰드와 분말에 압력이 가해지게 되어, 영구자석의 제조가 어렵게 되며, 고순도 및 고밀도의 벌크 상태 영구자석(5)이 제조되기 어렵게 되는 문제점이 있었던 것이다.However, when the powder (1) charged in the mold is applied at a constant pressure by the upper and lower punches (2) and (3) while applying a current, the permanent magnet powder expanded in the direction perpendicular to the pressing direction has a plastic deformation temperature. The pressure is applied to the mold and powder before it is made, it is difficult to manufacture the permanent magnet, there was a problem that the high-purity and high-density bulk state permanent magnet (5) is difficult to manufacture.

본 발명은 상기와 같은 종래의 문제점들을 개선시키기 위하여 안출된 것으로서 그 목적은, NdFeB계 이방성 영구자석을 제조시 외부에 별도의 발열체나 고주파 코일등을 설치할 필요 없이, 등방성 영구자석 성형체을 상부 및 하부펀치로 가압 성형전에, 상기 상,하부 펀치에 직접 전류를 가하여 등방성 영구자석 성형체에 직접적으로 직류 전류를 통하게 하여 등방성 영구자석 성형체의 자체 저항에 의한 주울 열에 의해 NdFeB계 이방성 영구자석을 손쉽고, 용이하게 제조할 수 있도록 함은 물론, 상기 이방성 영구자석의 제조시 간편한 구조에 의해 제작 비용이 저렴하게 이루어질 수 있는 NdFeB계 이방성 영구자석의 제조방법을 제공하는데에 있다. The present invention has been made in order to improve the conventional problems as described above, the purpose is to produce an NdFeB-based anisotropic permanent magnet without the need to install a separate heating element or high-frequency coil, etc., the upper and lower punches Before the press molding, the NdFeB-based anisotropic permanent magnet is easily and easily manufactured by applying a current directly to the upper and lower punches to direct a direct current through the isotropic permanent magnet molded body by joule heat caused by the self-resistance of the isotropic permanent magnet molded body. The present invention provides a method of manufacturing an NdFeB-based anisotropic permanent magnet that can be made inexpensively by a simple structure in manufacturing the anisotropic permanent magnet.

상기와 같은 목적을 달성하기 위한 기술적인 수단으로서 본 발명은, 등방성 영구자석 성형체를 상부 및 하부펀치 사이에 밀착시켜 고정시키고, 상기 상부 및 하부펀치에 일정 압력으로 압력을 가함과 동시에 전기장치를 통해 전류를 인가시켜 성형체로 부터 소성 변형된 이방성 영구자석을 제조하는 방법에 있어서,As a technical means for achieving the above object, the present invention, the isotropic permanent magnet molded body is fixed in close contact between the upper and lower punches, while applying pressure to the upper and lower punches at a constant pressure through the electrical device In the method for producing a plastically deformed anisotropic permanent magnet from a molded article by applying a current,

상기 상부 및 하부펀치에 직류 전류를 500~3000A/㎠로 인가하여 등방성 영구자석의 성형체의 내부에 저항열이 700~800℃가 되도록 열을 발생시킨 후, 상기 상부 및 하부펀치를 50~200MPa 압력을 가압하여, 상기 등방성 영구자석 성형체가 가압방향으로 수축함과 동시에 가압방향의 수직 방향으로 팽창된 상태로 소성 변형되는 것을 특징으로 하는 NdFeB계 이방성 영구자석의 제조방법을 마련함에 의한다. Applying a DC current to the upper and lower punches 500 ~ 3000A / ㎠ to generate heat to the resistance heat is 700 ~ 800 ℃ inside the molded body of the isotropic permanent magnet, the upper and lower punches 50 ~ 200MPa pressure By pressing the, the isotropic permanent magnet molded body shrinkage in the pressing direction and at the same time plastic deformation in the expanded state in the vertical direction of the pressing direction by providing a method for producing an NdFeB-based anisotropic permanent magnet.

이하, 첨부된 도면에 의거하여 본 발명의 실시예를 상세하게 설명하면 다음과 같다.Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

도 4는 본 발명에 따른 NdFeB계 이방성 영구자석의 제조방법을 설명하기 위한 개략 공정도로서, 등방성 영구자석 성형체(110)를 상부 및 하부펀치(130)(140) 사이에 밀착되는 상태로 고정시키며, 이기와같이, 상,하부 펀치(130)(140) 사이에 밀착 고정되는 등방성 영구자석 성형체(110)는, 이를 소성토록 상기 상,하부 펀치(130)(140)에 전기장치(150)를 통하여 직류 전류를 500~3000A/㎠로 인가시킨다.4 is a schematic process diagram for explaining a method for manufacturing an NdFeB-based anisotropic permanent magnet according to the present invention, fixing the isotropic permanent magnet molded body 110 in close contact with the upper and lower punch 130, 140, As described above, the isotropic permanent magnet molded body 110 which is tightly fixed between the upper and lower punches 130 and 140 is fired through the electric device 150 to the upper and lower punches 130 and 140. Apply DC current at 500 ~ 3000A / cm2.

상기와같이 상,하부 펀치(130)(140)에 인가되는 전류는 등방성 영구자석 성형체(110)에 흐르면서, 상기 등방성 영구자석 성형체의 내부에 저항열이 700~800℃가 되도록 열을 발생시킨 후, 상기 등방성 영구자석 성형체가 소성온도 도달될 경우, 상기 상,하부 펀치(130)(140)에 50~200MPa의 압력을 가압하여, 상기 상부 및 하부펀치의 가압방향으로 분말 성형체가 수축함과 동시에 가압방향의 수직 방향으로 팽창된 상태의 NdFeB계 이방성 영구자석(120)을 성형한다.As described above, the current applied to the upper and lower punches 130 and 140 flows through the isotropic permanent magnet molded body 110 to generate heat such that resistance heat becomes 700 to 800 ° C. inside the isotropic permanent magnet molded body. When the isotropic permanent magnet molded body reaches a firing temperature, the upper and lower punches 130 and 140 are pressurized with a pressure of 50 to 200 MPa, and at the same time the powder compact is shrunk in the pressing direction of the upper and lower punches. The NdFeB-based anisotropic permanent magnet 120 is formed in an expanded state in the vertical direction of the pressing direction.

이때, 상기 저항열을 700℃이하 또는 800℃ 이상으로 가열시키는 이유로서, 흑연 몰드(120) 내의 이방성 영구자석 성형체(110)의 내부의 열이 700℃이하일 경우, 너무 낮은 온도에 의해 소성변형이 일어나지 않게 되며, 또한 성형체 내부의 열이 800℃ 이상일 경우 너무 높은 열에 의해 급속한 소성변형에 의한 크랙 발생등과 같은 불량이 발생하게 되는데 기인하는 것이다.In this case, as a reason for heating the resistance heat to 700 ° C or less or 800 ° C or more, when the heat inside the anisotropic permanent magnet molded body 110 in the graphite mold 120 is 700 ° C or less, plastic deformation is caused by too low a temperature. If the heat inside the molded body is 800 ° C. or more, defects such as crack generation due to rapid plastic deformation are caused by too high heat.

또한, 상기 전기장치(150)를 통하여 인가되는 직류전류는 본 발명의 실시예에서 500~3000A/㎠로 형성되는 것이나, 상기 이방성 영구자석 성형체의 단위 면적 당 직경의 크기등에 의해 적당하게 변형할 수 있는 것이다.In addition, the DC current applied through the electric device 150 is 500 ~ 3000A / ㎠ in the embodiment of the present invention, it can be appropriately modified by the size of the diameter per unit area of the anisotropic permanent magnet molded body, etc. It is.

상기와같이, 이방성 영구자석(160)의 수축이 완료되었을 경우, 전류의 공급을 차단시킴으로써 이방성 영구자석(120)의 성형체를 얻는 것이다.As described above, when the contraction of the anisotropic permanent magnet 160 is completed, the molded body of the anisotropic permanent magnet 120 is obtained by interrupting the supply of current.

이상과 같이 본 발명인 NdFeB계 이방성 영구자석의 제조방법에 의하면, NdFeB계 이방성 영구자석을 제조시, 등방성 영구자석 성형체을 상부 및 하부펀치로 가압 성형전에, 상기 상,하부 펀치에 직접 전류를 가하여 등방성 영구자석 성형체에 직접적으로 직류 전류를 통하게 하여 등방성 영구자석 성형체의 자체 저항에 의한 주울 열에 의해 NdFeB계 이방성 영구자석을 손쉽고, 용이하게 제조할 수 있게 됨은 물론, 상기 이방성 영구자석의 제조시 간편한 구조에 의해 제작 비용이 저렴하게 이루어질 수 있는 우수한 효과가 있다. As described above, according to the manufacturing method of the NdFeB-based anisotropic permanent magnet of the present invention, when manufacturing the NdFeB-based anisotropic permanent magnet, the isotropic permanent magnet molded body is applied to the upper and lower punches by pressing the upper and lower punches, and then isotropic permanent The direct current flows directly through the magnet molded body to make NdFeB-based anisotropic permanent magnet easily and easily manufactured by Joule heat caused by the self-resistance of the isotropic permanent magnet molded body, as well as by the simple structure in manufacturing the anisotropic permanent magnet. There is an excellent effect that the production cost can be made cheap.

본 발명은 특정한 실시예에 관련하여 도시하고 설명하였지만, 이하의 특허청구의 범위에 의해 마련되는 본 발명의 정신이나 분야를 벗어나지 않는 한도내에서 본 발명이 다양하게 개조 및 변화될수 있다는 것을 당업계에서 통상의 지식을 가진자는 용이하게 알수 있음을 밝혀두고자 한다.While the invention has been shown and described with respect to specific embodiments thereof, it will be appreciated that various changes and modifications can be made in the art without departing from the spirit or scope of the invention as set forth in the following claims. Those of ordinary skill will want to know easily.

Claims (1)

등방성 영구자석 성형체를 상부 및 하부펀치 사이에 밀착시켜 고정시키고, 상기 상부 및 하부펀치에 일정 압력으로 압력을 가하면서 전기장치를 통해 전류를 인가시켜 성형체로 부터 소성 변형된 이방성 영구자석을 제조하는 방법에 있어서,A method of manufacturing anisotropic permanent magnets plastically deformed from a molded body by applying an electric current through an electric device while pressing and fixing the isotropic permanent magnet molded body between the upper and lower punches and applying pressure to the upper and lower punches at a predetermined pressure. To 상기 상부 및 하부펀치에 직류 전류를 500~3000A/㎠로 인가하여 등방성 영구자석의 성형체의 내부에 저항열이 700~800℃가 되도록 열을 발생시킨 후, 상기 상부 및 하부펀치를 50~200MPa 압력을 가압하여, 상기 등방성 영구자석 성형체가 가압방향으로 수축함과 동시에 가압방향의 수직 방향으로 팽창된 상태로 소성 변형되는 것을 특징으로 하는 NdFeB계 이방성 영구자석의 제조방법. Applying a DC current to the upper and lower punches 500 ~ 3000A / ㎠ to generate heat to the resistance heat is 700 ~ 800 ℃ inside the molded body of the isotropic permanent magnet, the upper and lower punches 50 ~ 200MPa pressure Pressurizing, the isotropic permanent magnet molded body shrinkage in the pressing direction and at the same time plastic deformation in the expanded state in the vertical direction of the pressing direction characterized in that the manufacturing method of the NdFeB-based anisotropic permanent magnet.
KR1020040086816A 2004-10-28 2004-10-28 A Manufacture Method of NdFeB Anisotropic permanent Magnets KR100631183B1 (en)

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US11/718,312 US20090060773A1 (en) 2004-10-28 2005-10-28 Manufacture Method of NDFEB Isotropic and Anisotropic Permanent Magnets
PCT/KR2005/003608 WO2006046838A1 (en) 2004-10-28 2005-10-28 A manufacture method of ndfeb isotropic and anisotropic permanent magnets

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JP2001068366A (en) * 1999-08-31 2001-03-16 Shin Etsu Chem Co Ltd Manufacturing method for anisortopic sintered magnet and manufacturing equipment therefor
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