To provide a method of manufacturing an inductor which can secure the insulating property on the side face of a core.
The inductor is such that a coil 3 is embedded in a square pole-shaped core consisting of a press-formed body of a ferromagnetic metal powder wherein the surface of ferromagnetic metal particles is coated with a thermosetting insulating material. The inductor is formed by using a molding die 11 which consists of a square pole-shaped upper punch 12, an upper die 14 consisting of a pair of upper die members 14a and 14b which form a square frame and can be separated from each other in a diagonal direction, a square pole-shaped lower punch 13, and a lower die 15 consisting of a pair of lower die members 15a and 15b which form a square frame and can be separated from each other in a diagonal direction. In manufacturing the inductor, the inside of the lower die 15 is filled with the ferromagnetic metal powder, and then the coil 3 is placed across the lower die members 15a and 15b. Then, the upper die 14 is placed on the lower die 15 with ends b1 and b2 of the coil 3 held between the upper and lower dies, and then the inside of the upper die 14 is filled with the ferromagnetic metal powder so as to embed the coil 3 therein. After the core is compression-molded by applying molding pressure to the ferromagnetic metal powder by the upper and lower punches 12 and 13, the upper die members 14a and 14b are separated in a diagonal direction and so are the lower die members 15a and 15b to take out the core from a gap between the upper and lower punches 12 and 13.
WADA HIROYUKI
DAIGAKU HAJIME
Satoshi Kono
Makoto Nakamura
Kurata Masatoshi
Takashi Mine
Yoshihiro Fukuhara
Sadao Muramatsu
Ryo Hashimoto