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:
Mar. 15, 2016
Filed:
Dec. 27, 2011
Hideto Kuriyama, Hadano, JP;
Katsunori Osabe, Hadano, JP;
Hiroyuki Akutagawa, Hadano, JP;
Kenichi Ikei, Hadano, JP;
Hiroaki Takamune, Hadano, JP;
Yuki Shimizu, Hadano, JP;
Hideto Kuriyama, Hadano, JP;
Katsunori Osabe, Hadano, JP;
Hiroyuki Akutagawa, Hadano, JP;
Kenichi Ikei, Hadano, JP;
Hiroaki Takamune, Hadano, JP;
Yuki Shimizu, Hadano, JP;
NITTAN VALVE CO., LTD., Hadano-shi, JP;
Abstract
An engine valve forging system includes a molding forging die having a circular hole stem molding portion continued to a tip end of a head type molding portion, to mold an engine valve by extrusion-forging a material from the head type molding portion to the stem molding portion by an upper die, and a stem guide forging die which is coaxially disposed to communicate with a tip end of the stem molding portion, and has a guide portion for a stem portion of an engine valve extruded from the stem molding portion, and a plurality of stem curve restraining portions having a shape gradually tapering toward a central shaft line from a rear end portion to a tip end portion are formed continuously along the central shaft line of the guide portion in the guide portion, to be capable of manufacturing high-precision engine valves with less stem curve.