H - Electricity – 01 – F
Patent
H - Electricity
01
F
75/166, 148/6
H01F 41/02 (2006.01) B22F 3/02 (2006.01) B22F 3/14 (2006.01) B22F 5/00 (2006.01) B30B 11/02 (2006.01) H01F 1/057 (2006.01)
Patent
CA 2038702
ABSTRACT OF THE DISCLOSURE A method of forming a cylindrical compact for a cylindrical magnet is improved by moving a core pin and a die of a mold at the same time of pressing maget materials with a pressing punch in the same direction as that of the pressing punch at travelling speed Vc and Vd indicated by following equations : Vc=m?Vp(0.5 ? m ? 1.0) Vd=n?Vp(0.5 ? n ? 1.0) where Vc is the travelling speed of the core pin, Vd is the travelling speed of the die and Vp is the pressing speed of the pressing punch. According to this invention, it is possible to form the thin-walled and long-sized cylindrical compact by utilizing the frictional force caused between the mold and the magnet materials for forming the compact very effectively in order to obtain a thim-walled and long-shaped cylindrical magnet as compared with the conventional one.
Kasai Yasuaki
Watanabe Teruo
Yamada Hiyoshi
Yoshida Yutaka
Yoshikawa Norio
Daido Tokushuko Kabushiki Kaisha
Smart & Biggar
LandOfFree
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