Permanent magnet production method
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United States of America Patent
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Dec 1, 2015
Grant Date -
Jul 11, 2013
app pub date -
Jan 8, 2013
filing date -
Jan 10, 2012
priority date (Note) -
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Abstract
With a mandrel inserted in a through hole formed in an extrusion die, a preform filled in the through hole is extruded into a filling space defined between an inner surface of the through hole and an outer surface of the mandrel by pressing the preform with a pressing punch. Consequently, a cylindrical extruded form in which a plurality of stress concentration portions extending along an extruding direction are formed so as to be spaced apart from each other in a circumferential direction is formed. Then, an external force is applied to the extruded form thus obtained to thereby divide the extruded form at the stress concentration portions into a plurality of permanent magnets.
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