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:
Aug. 02, 1983
Filed:
Apr. 22, 1981
Seishiro Yoshiwara, Kitakyushu, JP;
Mitsuo Kanda, Kitakyushu, JP;
Nippon Steel Corporation, Tokyo, JP;
Abstract
The present invention is an improvement of such methods as the Stiefel-Mannesman piercing, and the Mannesmann piercing methods with a pair of driven rolls which impart a screw movement to the work piece, and has the roll axis inclined to the centerline of mill. Instead of a conventional pair of driven disc rolls or shoes, one driven disc roll and one shoe or one guide roll are used in the invention to form the rolling pass together with the driven rolls, and the centerline of pass is greatly off set from the centerline of mill toward the one shoe or guide roll. The operating efficiency and quality of tubular products are simultaneously enhanced.