Process of producing permanent magnet and permanent magnet

Details Process of producing permanent magnet and permanent magnet Process of producing permanent magnet and permanent magnet

2007-08-31

2010-06-08

Jones, David B (Department: 3725)

Metal deforming

By use of closed-die and coacting work-forcer

C072S253100, C072S467000, C072S700000, C148S101000, C148S104000, C419S012000, C264S112000

Reexamination Certificate

active

07730755

ABSTRACT:
The present invention relates to a process of producing a permanent magnet, which includes extruding a preform to form a plate-shaped permanent magnet, in which the preform is extruded in such a way that a dimension of a cross section of the preform is reduced in an X-direction and enlarged in a Y-direction perpendicular to the X-direction. The present invention also relates to a plate-shaped permanent magnet formed by extruding a preform, in which the preform is extruded in such a way that a dimension of a cross section of the preform is reduced in an X-direction and enlarged in a Y-direction perpendicular to the X-direction, whereby the permanent magnet has a strain ratio ε2/ε1with respect to the preform in a range of 0.2 to 3.5, in which ε1is a strain in the direction of the extrusion of the preform and ε2is a strain in the Y-direction.

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