【発明の名称】薄肉長尺リング状磁石成形体の成形方法

Japanese Patent JP2819748

B2

A method of forming a cylindrical compact for a cylindrical magnet is improved by moving a core pin (2) and a die (4) of a mold at the same time of pressing maget materials with a pressing punch (5) in the same direction as that of the pressing punch at travelling speed Vc and Vd indicated by following equations : $$ where\; Vc\; is\; the\; travelling\; speed\; of\; the\; core\; pin,\; Vd\; is\; the\; travelling\; speed\; of\; the\; die\; and\; Vp\; is\; the\; pressing\; speed\; of\; the\; pressing\; punch.\; According\; to\; this\; invention,\; it\; is\; possible\; to\; form\; the\; thin-walled\; and\; long-sized\; cylindrical\; compact\; by\; utilizing\; the\; frictional\; force\; caused\; between\; the\; mold\; and\; the\; magnet\; materials\; for\; forming\; the\; compact\; very\; effectively\; in\; order\; to\; obtain\; a\; thim-walled\; and\; long-shaped\; cylindrical\; magnet\; as\; compared\; with\; the\; conventional\; one.\mathop{\mathrm{image}}$$

Teruo Watanabe
Kasai Yasumasa
Yamada Hiyoshi
Norio Yoshikawa
Hiroshi Yoshida

JP7509590A

November 05, 1998

March 23, 1990

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Daido Steel Co., Ltd.

B22F3/02; B30B11/02; H01F1/057; H01F41/02; (IPC1-7): H01F41/02

Yutaka Oshio

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