圧粉磁心の製造方法

Japanese Patent JP5886541

B2

There are provided a dust core in which, even if the surface of a heat-treated compact is ground, the insulation between soft magnetic particles on the ground surface can be ensured in the grinding step, and a method for producing the dust core. The method includes a preparation step of preparing a heat-treated compact 100 by compacting soft magnetic particles having an insulation coating and heating the resultant compact to a predetermined temperature; and a machining step of removing part of the heat-treated compact 100 using a working tool 2. The machining step is performed while an electric current is supplied with a conductive fluid 7L between the heat-treated compact 100 serving as an anode and a working tool 2 that machines the heat-treated compact 100 or a first counter electrode 5 that faces the working tool 2 with a distance therebetween, the working tool 2 or the first counter electrode 5 serving as a cathode. A bridge portion that connects soft magnetic particles to each other is removed through the supply of an electric current, the soft magnetic particles being adjacent to each other along a machined surface of the heat-treated compact 100.

Tomoyuki Ueno
Takao Nishioka

JP2011109774A

March 16, 2016

May 16, 2011

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Sumitomo Electric Industries, Ltd.
Sumitomo Electric Sintered Alloy Co., Ltd.

H01F41/02; B22F3/24; C22C33/02; C25D9/06; H01F1/24; H01F27/255

JP60012713A
JP2002224916A
JP2005317678A
JP2011181654A
JP53050424A
JP9180184A
JP2008105124A

Hiroshi Yamano

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