JP2016081942A - 希土類磁石の製造方法 - Google Patents
希土類磁石の製造方法 Download PDFInfo
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- JP2016081942A JP2016081942A JP2014208249A JP2014208249A JP2016081942A JP 2016081942 A JP2016081942 A JP 2016081942A JP 2014208249 A JP2014208249 A JP 2014208249A JP 2014208249 A JP2014208249 A JP 2014208249A JP 2016081942 A JP2016081942 A JP 2016081942A
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- sintered body
- rare earth
- earth magnet
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- plastic working
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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
- H01F41/0266—Moulding; Pressing
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- 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
- B22F3/003—Apparatus, e.g. furnaces
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- 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
- B22F3/16—Both compacting and sintering in successive or repeated steps
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- 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
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- 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
- B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
- B22F2998/10—Processes characterised by the sequence of their steps
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- 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
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- 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
- H01F1/0577—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 sintered
Abstract
Description
図1は本発明の希土類磁石の製造方法の第1のステップで使用する磁性粉末の製作方法を説明した模式図であり、図2,3はそれぞれ、希土類磁石の製造方法の第1のステップ、第2のステップを説明した模式図である。
本発明者等は、潤滑剤としてグラファイトシートのみを使用した場合(比較例)と、一対のグラファイトシート間にガラス系潤滑剤が介在してなる潤滑シートを使用した場合(実施例)において、製造された希土類磁石の上面視観察をおこなう実験を試みた。
成形型のキャビティに上記二種類のシート状の潤滑剤を配設し、焼結体を上下の潤滑剤で挟んで熱間塑性加工を実施した。ここで、比較例のグラファイトシートは厚みが200μmであり、実施例の潤滑シートは上下ともに厚み50μmのグラファイトシートの間に厚み100μmのガラスを介在させ、全体の厚みは比較例と同様200μmとした。焼結体はNd-Fe-B系の希土類磁石の前駆体であり、圧下率70%で熱間プレス(熱間塑性加工)をおこなった。
図5(a)は比較例の焼結体とこの焼結体を熱間塑性加工してできた希土類磁石の模式図であり、図5(b)は希土類磁石の上面写真図である。また、図6(a)は実施例の焼結体とこの焼結体を熱間塑性加工してできた希土類磁石の模式図であり、図6(b)は希土類磁石の上面写真図である。
本発明者等は、グラファイトシートとガラス系潤滑剤が組み合わされてできた潤滑シートを使用した際のキャビティと焼結体の間の摩擦係数を考察するべく、CAE解析を実施した。具体的には、グラファイトシートとガラス粉末からなる潤滑シートを用いた際の潤滑性の効果を定量化するべく、CAE解析を適用して、焼結体と成形型を構成するパンチの側面の間の摩擦係数と圧下率を種々変更させ、図6で示す形状と照らし合わせることで当該潤滑シートを適用した際の摩擦係数の導出を試みた。なお、図8は、CAE解析結果を示した図である。
Claims (3)
- 希土類磁石材料となる磁性粉末を焼結して焼結体を製作する第1のステップ、
ダイスと、該ダイス内を摺動する下パンチおよび/または上パンチと、からなる成形型のキャビティに焼結体を収容し、該焼結体に磁気的異方性を与える熱間塑性加工を施して希土類磁石を製造する第2のステップからなり、
第2のステップにおいて、下パンチおよび上パンチのキャビティに対向する側面と焼結体の間にそれぞれ、一対のグラファイトシート間にガラス系潤滑剤が介在してなる潤滑シートを配設し、上下の潤滑シートにて焼結体を挟んだ状態で熱間塑性加工をおこなう希土類磁石の製造方法。 - 第2のステップにおいて、潤滑シートが下パンチおよび上パンチのキャビティに対向する側面に取り付けられる請求項1に記載の希土類磁石の製造方法。
- 第2のステップにおいて、二つの潤滑シートが焼結体の上下面にそれぞれ取り付けられる請求項1に記載の希土類磁石の製造方法。
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JP2014208249A JP6102881B2 (ja) | 2014-10-09 | 2014-10-09 | 希土類磁石の製造方法 |
US14/833,803 US10090103B2 (en) | 2014-10-09 | 2015-08-24 | Method for manufacturing rare-earth magnets |
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JP2014208249A JP6102881B2 (ja) | 2014-10-09 | 2014-10-09 | 希土類磁石の製造方法 |
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JP2016081942A true JP2016081942A (ja) | 2016-05-16 |
JP6102881B2 JP6102881B2 (ja) | 2017-03-29 |
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Cited By (1)
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JP2017078144A (ja) * | 2015-10-22 | 2017-04-27 | 学校法人大同学園 | 温・熱間加工用潤滑剤および温・熱間加工方法 |
Families Citing this family (2)
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JP7201332B2 (ja) * | 2018-04-09 | 2023-01-10 | トヨタ自動車株式会社 | 希土類磁石の製造方法及びそれに用いられる製造装置 |
CN109773190A (zh) * | 2019-03-28 | 2019-05-21 | 南昌航空大学 | 一种高致密度高硬度块体铁基非晶合金的烧结方法 |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6468403A (en) * | 1987-09-07 | 1989-03-14 | Kobe Steel Ltd | Method for forging powder |
JPH03241705A (ja) * | 1989-11-14 | 1991-10-28 | Hitachi Metals Ltd | 磁気異方性磁石及びその製造方法 |
JPH04118133A (ja) * | 1990-09-07 | 1992-04-20 | Daido Steel Co Ltd | 熱間塑性加工用潤滑剤 |
JPH04212841A (ja) * | 1990-01-29 | 1992-08-04 | Ucar Carbon Technol Corp | 可撓性グラファイトラミネートおよびその製法 |
JP2013530047A (ja) * | 2010-06-14 | 2013-07-25 | エイティーアイ・プロパティーズ・インコーポレーテッド | 改良された鍛造性のための潤滑法 |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH02138706A (ja) | 1988-11-18 | 1990-05-28 | Daido Steel Co Ltd | 異方性永久磁石 |
JPH09129465A (ja) | 1995-10-30 | 1997-05-16 | Daido Steel Co Ltd | Nd−Fe−B系磁石の製造方法 |
BR112013006106B1 (pt) * | 2010-09-15 | 2020-03-03 | Toyota Jidosha Kabushiki Kaisha | Método de produção de imã de terras-raras |
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- 2014-10-09 JP JP2014208249A patent/JP6102881B2/ja active Active
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Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6468403A (en) * | 1987-09-07 | 1989-03-14 | Kobe Steel Ltd | Method for forging powder |
JPH03241705A (ja) * | 1989-11-14 | 1991-10-28 | Hitachi Metals Ltd | 磁気異方性磁石及びその製造方法 |
JPH04212841A (ja) * | 1990-01-29 | 1992-08-04 | Ucar Carbon Technol Corp | 可撓性グラファイトラミネートおよびその製法 |
JPH04118133A (ja) * | 1990-09-07 | 1992-04-20 | Daido Steel Co Ltd | 熱間塑性加工用潤滑剤 |
JP2013530047A (ja) * | 2010-06-14 | 2013-07-25 | エイティーアイ・プロパティーズ・インコーポレーテッド | 改良された鍛造性のための潤滑法 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2017078144A (ja) * | 2015-10-22 | 2017-04-27 | 学校法人大同学園 | 温・熱間加工用潤滑剤および温・熱間加工方法 |
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JP6102881B2 (ja) | 2017-03-29 |
US20160104572A1 (en) | 2016-04-14 |
US10090103B2 (en) | 2018-10-02 |
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