Jfe Steel Corporation

Kotaro Okawa

Yukiko Ozaki

Kuniaki Ogura

Ichio Sakurada

Yoshiaki Maeda

Kiyoshi Makino

The present invention provides a method for mixing a raw material powder for powder metallurgy that allows efficient mixing at a low cost with a simple measure and easy adjustment of the apparent density by performing first agitation mixing in which a powder mixture obtained by adding, to an iron powder, one or two or more members selected from lubricant powders, free-machining agent powders, and lubricant powders for sliding surface, an alloying powder, and a binding agent is agitated while increasing the temperature to a temperature Tequal to or higher than the melting point Tof the binding agent, the resultant is agitated while maintaining the temperature T, and the resultant is further agitated while reducing the temperature from the temperature T, and performing second agitation mixing in which the obtained powder mixture is agitated while cooling.

Growing community of inventors

Chiba, Japan

Kotaro Okawa