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:
Oct. 08, 1991
Filed:
May. 23, 1990
Ryuji Soga, Sayama, JP;
Nobuaki Hojo, Sayama, JP;
Kenichia Hakozaki, Sayama, JP;
Hisayuki Sakurai, Sayama, JP;
Shigehisa Seya, Sayama, JP;
Honda Giken Kogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
A metallic product is formed by an electric upsetter having anvil and clamp electrodes. The anvil electrode is made of a material having a relatively small thermal conductivity. A rod-shaped blank of a metallic material is placed between the anvil and clamp electrodes. Then, an electric current is passed through the rod-shaped blank to heat the same. The rod-shaped blank is pushed toward the anvil electrode under a constant force to thicken an end of the rod-shaped blank which is held against the anvil electrode. The electric current passed through the rod-shaped blank is controlled such that the rod-shaped blank is pushed at a predetermined speed depending on a displacement by which the rod-shaped blank is pushed toward the anvil electrode, thereby producing a preliminary product with the thickened end. The preliminary product is subsequently formed into an engine valve by closed-die forging.