发明授权
- 专利标题： Process of producing permanent magnet and permanent magnet
- 专利标题（中）： 生产永久磁铁和永久磁铁的工艺
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申请号： US11896360申请日： 2007-08-31
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公开(公告)号： US07730755B2公开(公告)日： 2010-06-08
- 发明人: Junichi Esaki , Hiroaki Yoshida , Sachihiro Isogawa
- 申请人： Junichi Esaki , Hiroaki Yoshida , Sachihiro Isogawa
- 申请人地址： JP
- 专利权人： Daido Tokushuko Kabushiki Kaisha
- 当前专利权人： Daido Tokushuko Kabushiki Kaisha
- 当前专利权人地址： JP
- 代理机构： Bacon & Thomas, PLLC
- 优先权： JP2006-242146 20060906; JP2007-176579 20070704
- 主分类号： B21D22/00
- IPC分类号： B21D22/00 ; B21D31/00 ; H01F5/00 ; B21C23/00
摘要：
The present invention relates to a process of producing a permanent magnet, which includes extruding a preform to form a plate-shaped permanent magnet, in which the preform is extruded in such a way that a dimension of a cross section of the preform is reduced in an X-direction and enlarged in a Y-direction perpendicular to the X-direction. The present invention also relates to a plate-shaped permanent magnet formed by extruding a preform, in which the preform is extruded in such a way that a dimension of a cross section of the preform is reduced in an X-direction and enlarged in a Y-direction perpendicular to the X-direction, whereby the permanent magnet has a strain ratio ε2/ε1 with respect to the preform in a range of 0.2 to 3.5, in which ε1 is a strain in the direction of the extrusion of the preform and ε2 is a strain in the Y-direction.