Method for preparing rare earth sintered magnet
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United States of America Patent
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Jul 18, 2017
Grant Date -
Oct 15, 2015
app pub date -
Apr 3, 2015
filing date -
Apr 9, 2014
priority date (Note) -
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Abstract
A rare earth sintered magnet is prepared from a corresponding alloy powder, using a mold comprising a die, an upper punch, and a lower punch which is divided into a plurality of punch segments which are independently movable within the die. The method comprises the steps of filling the mold cavity with the alloy powder when one or more selected punch segments are moved to a higher position than the remaining punch segments; moving the selected punch segments down to the position where the selected and remaining punch segments assume the normal shape of the lower punch during the compression step; compressing the alloy powder between the upper and lower punches under a magnetic field while the normal shape of the lower punch is maintained, for thereby molding a compact; and heat treating the compact.
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