Mold for the production of anisotropic permanent magnets
AssigneeMagnetfabrik Bonn G.m.b.H. vormals Gewerkschaft Windhorst
InventorErich A. Steingroever
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Abstract
A mold for producing anisotropic permanent magnets consists of a cavity defined by a thin-walled tubular lining element closely surrounded by an electrical field coil, reinforced by a metal ring enclosing the field coil so that a magnetic field of a given strength can be generated in the cavity with less power than in the case of the conventional field coil normally positioned at a relatively greater distance from the interior of the cavity. The lining element can be composed of a non-metallic material such as a ceramic, or sintered Al.sub.2 O.sub.3.
Claims17
A mold for use with at least one reciprocatory ram for the production of anisotropic permanent magnets from permanent magnet powder under the influence of a magnetic field, said mold having a cavity to receive said ram for compacting said particles within said cavity under pressure, said cavity being defined by tubular relatively thin-walled lining, a radially incompressible electrical field coil means closely surrounding said lining, and means for reinforcing said field coil means and said lining against excessive radially outwardly directed forces generated within said cavity.
A mold having a cavity for coaction with at least one reciprocatory cylindrical press ram for compacting particulate materials under pressure and the influence of a magnetic field to produce anisotropic permanent magnet bodies, the innermost layer of material forming the mold comprising a wear-resistant material, an outer layer of the mold comprising ferromagnetic material, and tubular radially incompressible magnetic field generating means embedded in said mold between said inner and outer layers for generating an elongated toroidal magnetic field which passes axially through said cavity in one direction and predominantly through said outer layer of the mold in the opposite direction.
Dependencies are inferred from the claim text.