发明公开
EP1788594A1 PRODUCTION METHOD FOR MAGNETIC-ANISOTROPY RARE-EARTH SINTERED MAGNET AND PRODUCTION DEVICE THEREFOR
有权
HERSTELLUNGSVERFAHRENFÜRMAGNETISCH ANISOTROPEN SELTENERD-SINTERMAGNET
- 专利标题: PRODUCTION METHOD FOR MAGNETIC-ANISOTROPY RARE-EARTH SINTERED MAGNET AND PRODUCTION DEVICE THEREFOR
- 专利标题(中): HERSTELLUNGSVERFAHRENFÜRMAGNETISCH ANISOTROPEN SELTENERD-SINTERMAGNET
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申请号: EP05765338.8申请日: 2005-06-30
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公开(公告)号: EP1788594A1公开(公告)日: 2007-05-23
- 发明人: Sagawa, Masato, c/o Intermetallics Co., Ltd. , Nagata, Hiroshi, c/o Intermetallics Co., Ltd. , Itatani, Osamu, c/o Intermetallics Co., Ltd.
- 申请人: INTERMETALLICS CO., LTD.
- 申请人地址: 1-36 Ohara, Goryo, Nishikyo-ku Kyoto-shi Kyoto 6158245 JP
- 专利权人: INTERMETALLICS CO., LTD.
- 当前专利权人: INTERMETALLICS CO., LTD.
- 当前专利权人地址: 1-36 Ohara, Goryo, Nishikyo-ku Kyoto-shi Kyoto 6158245 JP
- 代理机构: Hoeger, Stellrecht & Partner Patentanwälte
- 优先权: JP2004195935 20040701
- 国际公布: WO2006004014 20060112
- 主分类号: H01F41/02
- IPC分类号: H01F41/02 ; B22F3/00 ; B22F3/02 ; B22F3/087 ; C22C1/04 ; C22C33/02
摘要:
To improve the performance of a rare-earth magnet, it is effective to use a low-oxidized powder having a small grain size. One objective of the present invention is to provide a method for manufacturing a sintered rare-earth magnet having a magnetic anisotropy, in which a very active powder having a small grain size can be safely used in a low-oxidized state. Another objective is to provide a method capable of efficiently manufacturing products having various shapes. In a weighing and loading section 41 and a high-density loading section 42, a fine powder as a material of the sintered rare-earth magnet having a magnetic anisotropy is loaded into a mold until its density reaches a predetermined level. Then, in a magnetic orientation section 43, the fine powder is oriented by a pulsed magnetic field. Subsequently, the fine powder is not compressed but immediately sintered in a sintering furnace 44. The present method enables the mass-producing machine to be simple in its operation and its housing to be accordingly smaller, so that it will be possible to eliminate the danger of oxidization or burning of the powder, which has been a serious problem for a conventional method that uses a large-scale die-pressing machine. Furthermore, the manufacturing efficiency can be improved by using a multi-cavity mold for manufacturing a sintered rare-earth magnet having an industrially important shape, such as a plate magnet or an arched plate magnet.
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