Title:
PROCESS FOR PRODUCING RADIALLY ANISOTROPIC MAGNET
Document Type and Number:
WIPO Patent Application WO/2007/069454
Kind Code:
A1
Abstract:
A process for producing a radially anisotropic magnet through charging of a magnet
powder in a cavity of cylindrical magnet molding die assembly equipped with a
die, a core and upper and lower punches, applying of a magnetic field to the magnet
powder and pressurizing of the magnet powder by means of the upper and lower punches
to thereby attain molding of the magnet powder according to a horizontal magnetic
field vertical molding technique, characterized in that the upper punch is formed
in divided form so as to realize partial pressurization, and that in the molding
of the magnet powder charged in the die assembly cavity according to a horizontal
magnetic field vertical molding technique, the magnet powder is partially pressurized
by the use of divided part of the upper punch and the lower punch so as to attain at
the partially pressurized part of the magnet powder a density increase to a level
of from 1.1 times the packing density to below the density of molded item, and that
thereafter the whole magnet powder within the cavity is pressurized under a pressure
not lower than that at the preceding partial pressurization by means of the entirety
of the upper and lower punches to thereby carry out principal molding.
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Inventors:
SATO, Koji (Shin-Etsu Chemical Co. Ltd., 1-5, Kitago 2-chom, Echizen-sen-shi Fukui 15, 9158515, JP)
佐藤 孝治 (〒15 福井県越前市北府２丁目１番５号 信越化学工業株式会社 磁性材料研究所内 Fukui, 9158515, JP)
KITAGAWA, Mitsuo (Shin-Etsu Chemical Co. Ltd., 1-5, Kitago 2-chom, Echizen-sen-shi Fukui 15, 9158515, JP)
佐藤 孝治 (〒15 福井県越前市北府２丁目１番５号 信越化学工業株式会社 磁性材料研究所内 Fukui, 9158515, JP)
KITAGAWA, Mitsuo (Shin-Etsu Chemical Co. Ltd., 1-5, Kitago 2-chom, Echizen-sen-shi Fukui 15, 9158515, JP)
Application Number:
JP2006/323771
Publication Date:
June 21, 2007
Filing Date:
November 29, 2006
Export Citation:
Assignee:
Shin-Etsu Chemical Co., Ltd. (6-1 Otemachi 2-chome, Chiyoda-ku, Tokyo 04, 1000004, JP)
信越化学工業株式会社 (〒04 東京都千代田区大手町二丁目６番１号 Tokyo, 1000004, JP)
SATO, Koji (Shin-Etsu Chemical Co. Ltd., 1-5, Kitago 2-chom, Echizen-sen-shi Fukui 15, 9158515, JP)
佐藤 孝治 (〒15 福井県越前市北府２丁目１番５号 信越化学工業株式会社 磁性材料研究所内 Fukui, 9158515, JP)
信越化学工業株式会社 (〒04 東京都千代田区大手町二丁目６番１号 Tokyo, 1000004, JP)
SATO, Koji (Shin-Etsu Chemical Co. Ltd., 1-5, Kitago 2-chom, Echizen-sen-shi Fukui 15, 9158515, JP)
佐藤 孝治 (〒15 福井県越前市北府２丁目１番５号 信越化学工業株式会社 磁性材料研究所内 Fukui, 9158515, JP)
International Classes:
H01F41/02; H01F13/00
Attorney, Agent or Firm:
KOJIMA, Takashi (GINZA OHTSUKA Bldg. 2F, 16-12 Ginza 2-chom, Chuo-ku Tokyo 61, 1040061, JP)
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