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公开(公告)号:US5384957A
公开(公告)日:1995-01-31
申请号:US994596
申请日:1992-12-21
Applicant: Fumihito Mohri , Hideko Arai , Yoshio Sakata
Inventor: Fumihito Mohri , Hideko Arai , Yoshio Sakata
CPC classification number: G03G15/0921 , B29C47/0016 , B29C47/003 , B29C70/64 , H01F41/028 , H01F7/0268 , B29C47/00 , B29K2995/0008 , B29L2031/324 , Y10T29/49563
Abstract: A method of producing a magnet roll in which a magnetic property comparable to that obtained by an injection molding can be obtained in spite of an extrusion molding. According to a first embodiment, the yoke width of the magnetic-field extrusion die is varied along an extrusion direction. According to a second embodiment, a pipe filled with resin bonded magnet material is used as a shaft. According to a third embodiment, a shaft having a groove which is filled with magnet is used. According to a fourth embodiment, a shaft provided with surface magnetic charge is used. According to a fifth embodiment, a magnetized region of a shaft is set to be shorter than the length of a main magnet. According to a sixth embodiment, an extruded matter is moved while stored in a sizing metal mold having a magnetic circuit structure. According to a seventh embodiment, a sizing metal mold for storing an extruded matter therein is installed into a heating device and a cooling device equipped with a magnetic circuit structure while storing an extruded matter therein. According to an eighth embodiment, a preliminary magnetization is carried out with magnetic poles whose number is smaller than a finally-required number of magnetic poles, and then a re-magnetization is carried out with the finally-required number of magnetic poles.
Abstract translation: 制造磁性辊的方法,其中尽管挤压成型,但是可以获得与通过注射成型获得的磁性能相当的磁性能。 根据第一实施例,磁场挤压模的轭宽沿挤出方向变化。 根据第二实施例,使用填充有树脂粘结磁体材料的管作为轴。 根据第三实施例,使用具有填充有磁体的凹槽的轴。 根据第四实施例,使用设有表面磁荷的轴。 根据第五实施例,将轴的磁化区域设定为短于主磁体的长度。 根据第六实施例,挤压物质在存储在具有磁路结构的上胶金属模具中时移动。 根据第七实施例,将用于将挤出物质储存在其中的定型金属模具安装在加热装置和装有磁路结构同时在其中存储挤出物质的冷却装置中。 根据第八实施例,通过数字小于最终所需数量的磁极的磁极进行预磁化,然后用最终所需数量的磁极进行再磁化。