Title:
MANUFACTURING METHOD OF DUST CORE AND POWDER CORE
Document Type and Number:
Japanese Patent JP2022056962
Kind Code:
A
Abstract:
To provide a manufacturing method of a dust core capable of obtaining desired electromagnetic characteristics without causing cracking or swelling.SOLUTION: A dust core is produced by pressurizing magnetic powder 100 at least a part of which is coated 110 in a mold 300 while heating it at a predetermined temperature. The mold 300 is composed of a die 310, an upper punch 350, and a lower punch 330. The upper punch 350 is located above the lower punch 330 in the vertical direction. The mold 300 is provided with a low temperature portion 400 and a high temperature portion 500. The temperature of the low temperature portion 400 is 10°C or more lower than the temperature of the high temperature portion 500.SELECTED DRAWING: Figure 4
Inventors:
YAMAKI MAKOTO
ONISHI NAOTO
URATA KENRI
ONISHI NAOTO
URATA KENRI
Application Number:
JP2020164976A
Publication Date:
April 11, 2022
Filing Date:
September 30, 2020
Export Citation:
Assignee:
TOKIN CORP
International Classes:
H01F41/02; B22F1/00; B22F1/102; B22F1/16; B22F3/00; B22F3/14; B30B11/02; C22C38/00; H01F1/153; H01F1/24
Domestic Patent References:
| JP2017188677A | 2017-10-12 | |||
| JP2017073447A | 2017-04-13 | |||
| JP2004338166A | 2004-12-02 | |||
| JP2013214665A | 2013-10-17 | |||
| JP2016162947A | 2016-09-05 | |||
| JP2019179881A | 2019-10-17 |
Attorney, Agent or Firm:
Takuya Yamazaki
Takeshi Matsumoto
Hisanori Watanabe
Takeshi Matsumoto
Hisanori Watanabe