The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 18, 2015
Filed:
Aug. 13, 2008
Yoshiaki Maeda, Izumi-gun, JP;
Kiyoshi Makino, Chiba, JP;
Kotaro Okawa, Chiba, JP;
Ichio Sakurada, Ichihara, JP;
Kuniaki Ogura, Mobara, JP;
Yukiko Ozaki, Chiba, JP;
Yoshiaki Maeda, Izumi-gun, JP;
Kiyoshi Makino, Chiba, JP;
Kotaro Okawa, Chiba, JP;
Ichio Sakurada, Ichihara, JP;
Kuniaki Ogura, Mobara, JP;
Yukiko Ozaki, Chiba, JP;
JFE STEEL CORPORATION, Tokyo, JP;
Abstract
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.