Metal mold for molding anisotropic permanent magnets

Details Metal mold for molding anisotropic permanent magnets Metal mold for molding anisotropic permanent magnets

1989-08-16

1991-09-17

Housel, James C.

Plastic article or earthenware shaping or treating: apparatus

With direct application of magnetic force to manipulate...

249134, 249158, 264DIG58, 425 78, 425352, 425DIG33, B30B 1104

Patent

active

050490532

ABSTRACT:
Anisotropic rare-earth permanent magnets characterized in that an aggregate of a plurality of blocks, to each of which anisotropy is imparted, is formed using powders of magnetic material containing rare-earth elements, and the adjoining blocks are powder-metallurgically bonded together under pressure into one piece; a method of making anisotropic rare-earth permanent magnets by molding anisotropic blocks by magnetic-field molding, arranging, aggregating and sealing a plurality of blocks in a bag, and cold hydrostatic pressing the aggregate of blocks in the absence of magnetic field; and a suitable metal mold for magnetic-field molding anisotropic permanent magnets of a relatively large size.

REFERENCES:
patent: 3555621 (1971-01-01), Hara
patent: 3564654 (1971-02-01), Steingroever
patent: 3694115 (1972-09-01), Steingroever
patent: 4197067 (1980-04-01), Dore
patent: 4604042 (1986-08-01), Tanigawa et al.
patent: 4666389 (1987-05-01), Relis et al.

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