Title:
METHOD OF PRODUCING SINTERED MAGNET-USE GREEN COMPACT AND DEVICE THEREFOR
Document Type and Number:
WIPO Patent Application WO/2002/022294
Kind Code:
A1
Abstract:
An electromagnet (20) and ultrasonic vibrators (1, 2) are respectively driven to apply an orientation magnetic field to fine powder of rare earth magnetic alloy (magnetic powder (M)) after the magnetic powder (M) is filled in a press die (10), the magnetic powder (M) is compressed and consolidated by lowering an upper-side punch (12) while ultrasonic vibration is applied to the powder (M) via an outer die (11) to thereby allow the powder (M) to easily move and improve orientation due to reduced powder-to-powder (M) friction, and ultrasonic vibrators (1, 2) are driven to remove the consolidated power (M) (green compact) from the die while being vibrated, thereby preventing friction that would be produced at removing between the press die (10) and the green compact and disturbance in orientation at removing.
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Inventors:
SHIZUKU TAKAHISA (JP)
Application Number:
PCT/JP2001/007997
Publication Date:
March 21, 2002
Filing Date:
September 14, 2001
Export Citation:
Assignee:
BRIDGESTONE CORP (JP)
SHIZUKU TAKAHISA (JP)
SHIZUKU TAKAHISA (JP)
International Classes:
B30B11/00; B22F3/02; B22F3/093; B30B11/02; H01F41/02; (IPC1-7): B22F3/02; H01F41/02
Foreign References:
| JPH07153640A | 1995-06-16 |
Attorney, Agent or Firm:
Miyazono, Junichi (Fifth Tanaka Building 4-4 Iidabashi 3-chome Chiyoda-ku, Tokyo, JP)
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