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:
Nov. 01, 2011
Filed:
Nov. 28, 2007
Toshihiko Sato, Chigasaki, JP;
Yugo Takeuchi, Chigasaki, JP;
Yasuo Yoshida, Quingdao, CN;
Noboru Kakizawa, Chigasaki, JP;
Takehiro Osugi, Chigasaki, JP;
Takanori Yoshikawa, Chigasaki, JP;
Toshihiko Sato, Chigasaki, JP;
Yugo Takeuchi, Chigasaki, JP;
Yasuo Yoshida, Quingdao, CN;
Noboru Kakizawa, Chigasaki, JP;
Takehiro Osugi, Chigasaki, JP;
Takanori Yoshikawa, Chigasaki, JP;
Topy Kogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
The present invention is a press forging method by which porosities in a raw material are removed and mechanical properties such as ductility and toughness of a steel product are at a required level in a case that a steel ingot is treated as a raw material in press forging. A cylindrical steel ingot (a so-called 'round billet') is set onto a die as a raw material, and, a forging process is applied to the steel ingot so that buckling of the steel is not generated during the forging process and that a reduction ratio and a forging ratio are more than predetermined values, respectively.