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:
Apr. 01, 2014
Filed:
Apr. 15, 2008
Akihiro Ando, Hyogo, JP;
Kazushi Sakamoto, Hyogo, JP;
Shinobu Karino, Hyogo, JP;
Kenji Hara, Hyogo, JP;
Akihiro Ando, Hyogo, JP;
Kazushi Sakamoto, Hyogo, JP;
Shinobu Karino, Hyogo, JP;
Kenji Hara, Hyogo, JP;
Nisshin Steel Co., Ltd., Tokyo, JP;
Abstract
A spinning method for forming pipe bodies of varying diameter. In the spinning method, when a necked portion is formed at the end of the pipe material by the spinning method, working rollers are restricted so as to return immediately before the pipe end instead of being allowed to axially move beyond the end of the working object pipe. The amount of diameter reduction at the pipe end is set to be smaller than that of the most diameter reduced portion connecting to the pipe end. A protruding portion of a so-called bellmouth shape is formed at the working end, thereby preventing generation of fractures originating at the working end of the base portion or the welded portion and generation of wrinkles during the spinning process.