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:
Jan. 17, 2017
Filed:
Nov. 01, 2012
Applicant:
Nippon Steel & Sumitomo Metal Corporation, Tokyo, JP;
Inventors:
Kazuhiro Shimoda, Tokyo, JP;
Tomio Yamakawa, Tokyo, JP;
Kouji Yamane, Tokyo, JP;
Yuji Inoue, Tokyo, JP;
Syusuke Shimooka, Tokyo, JP;
Kouji Muramatsu, Tokyo, JP;
Assignee:
NIPPON STEEL & SUMITOMO METAL CORPORATION, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B21B 19/04 (2006.01); B21J 9/04 (2006.01); B21B 25/00 (2006.01);
U.S. Cl.
CPC ...
B21J 9/04 (2013.01); B21B 19/04 (2013.01); B21B 25/00 (2013.01);
Abstract
There is provided a piercing apparatus in which the occurrence of an inner surface flaw in a hollow shell is suppressed. A piercing apparatus () according to an embodiment of the present invention is the piercing apparatus () which pierces a billet (). The piercing apparatus () has a plug (). The plug () has a through hole (). The through hole () extends along the central axis, and allows the central portion of the billet () being pierced to pass therethrough.