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. 24, 2006
Filed:
May. 24, 2005
Hirotsugu Nakaike, Kainan, JP;
Kazuhiro Shimoda, Amagasaki, JP;
Tomio Yamakawa, Amagasaki, JP;
Toshiro Anraku, Tokyo, JP;
Hirotsugu Nakaike, Kainan, JP;
Kazuhiro Shimoda, Amagasaki, JP;
Tomio Yamakawa, Amagasaki, JP;
Toshiro Anraku, Tokyo, JP;
Sumitomo Metal Industries, Ltd., Osaka, JP;
Abstract
The present invention relates to a making method for a seamless metallic tube with a tilting roll type piercing rolling mill (piercer). According to the making method for a seamless metallic tube of the present invention, the rotary forging effect and the circumferential shearing strain can be significantly suppressed without generating uncompleted engagement of a billet. Accordingly, a product having reduced inside defects and excellent inside quality can be produced in high productivity. Further, by strengthening a plug nose rolling portion, a sharpened plug nose is obtained and an engagement limit can be increased. Additionally, a product further excellent in the inside quality can be efficiently produced. Accordingly, the present invention can be applied to wide fields of the piercing rolling of the seamless metallic tube.