Powder molding apparatus and manufacture of rare earth sintered magnet using the apparatus
AssigneeShin-Etsu Chemical Co., Ltd.
InventorsOsamu Kohno, Yoshihiro Umebayashi, Ryuji Nakamura, Takahiro Hashimoto
Life of this patent
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Abstract
When a powder material (5) is molded by introducing the material into a cavity (11) between a lower punch (2) and a die (1), compression molding the material between upper and lower punches (3 and 2) into a compact (51) of desired shape, and moving up the lower punch (2) to eject the compact (51), a lubricant is applied to the interior surface of the die (1) by fitting a pad (24) around the lower punch (2) and impregnating the pad with the lubricant. Since the lubricant is applied on every molding operation, molding operation can be continuously carried out.
Claims6
A powder molding apparatus comprising a die, an upper punch, and a lower punch, the die, the upper punch and the lower punch each adapted to move up and down relative to each other, the die having a through hole surrounded by an interior surface and extending between upper and lower ends, the upper punch having a lower surface, the lower punch having an upper surface, wherein
- the lower punch is provided with a band-like channel around its entire periphery, a pad fitted in the channel made of an elastic material selected from felt, non-woven fabric or sponge and able to be impregnated with at least 0.01 g/cm2 of the lubricant, and a lubricant conduit for feeding the lubricant to the pad,
- the lubricant is fed to the pad through the lubricant conduit to impregnate the pad with the lubricant and the lubricant is applied from the pad to the die interior surface as the lower punch is moved relative to the die up and down in the die during the molding operation.
Dependencies are inferred from the claim text.