Title:
METHOD FOR FORMING PRESSED POWDER COMPACT
Document Type and Number:
WIPO Patent Application WO/2012/147462
Kind Code:
A1
Abstract:
Provided is a method for forming a pressed powder compact with which it is possible to form a pressed powder compact from which a magnetic core with small iron loss can be produced. A pressed powder compact (100) to be used for a magnetic core is produced by filling a cavity made up of a columnar first punch (lower punch (12)) and a tubular die (10) with a powder mixture (3) containing a lubricant and a soft magnetic powder that has an insulating layer, and pressurizing the powder mixture (3) with the lower punch (12) and an upper punch (11). The lower punch (12) has a liquid retaining groove (24) in which a mold lubricant is filled, the mold lubricant being prepared by dispersing a solid lubricant powder in a liquid medium. The mold lubricant is supplied between the outer peripheral surface (12o) of the lower punch (12) and the inner peripheral surface (10i) of the die (10) from the liquid retaining groove (24), and the mold lubricant is coated on the inner peripheral surface (10i) of the die (10) by the relative movement of the lower punch (12) and the die (10). The powder mixture (3) contains 0.4 mass% to 0.8 mass% of the lubricant. By coating the forming mold (1) with the mold lubricant and employing the lubricant-containing powder mixture (3), the insulating layer can be prevented from getting damaged by the sliding contact etc. between the mold (1) and the compact.
Inventors:
KUSAWAKE KAZUSHI (JP)
SATO ATSUSHI (JP)
UOZUMI MASATO (JP)
YAMAGUCHI KOJI (JP)
SATO ATSUSHI (JP)
UOZUMI MASATO (JP)
YAMAGUCHI KOJI (JP)
Application Number:
PCT/JP2012/058948
Publication Date:
November 01, 2012
Filing Date:
April 02, 2012
Export Citation:
Assignee:
SUMITOMO ELECTRIC INDUSTRIES (JP)
KUSAWAKE KAZUSHI (JP)
SATO ATSUSHI (JP)
UOZUMI MASATO (JP)
YAMAGUCHI KOJI (JP)
KUSAWAKE KAZUSHI (JP)
SATO ATSUSHI (JP)
UOZUMI MASATO (JP)
YAMAGUCHI KOJI (JP)
International Classes:
H01F41/02; B22F1/10; B22F3/02; B30B11/00
Foreign References:
| JPH0726094U | 1995-05-16 | |||
| JP2002329626A | 2002-11-15 | |||
| JP2010225673A | 2010-10-07 | |||
| JP2010001561A | 2010-01-07 | |||
| JP2011032580A | 2011-02-17 | |||
| JPS3721508Y1 | ||||
| JPS4937165B1 | 1974-10-07 | |||
| JPH03291307A | 1991-12-20 |
Attorney, Agent or Firm:
NAKATA, Motomi et al. (JP)
Nakada Motoki (JP)
Nakada Motoki (JP)
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Claims:
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