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:
Jul. 22, 2014
Filed:
Aug. 20, 2012
Yoshiyuki Kuroiwa, Arida, JP;
Kouichi Kuroda, Takatsuki, JP;
Tomio Yamakawa, Kawanishi, JP;
Nippon Steel & Sumitomo Metal Corporation, Tokyo, JP;
Abstract
A method for straightening a tube by using an asymmetric roll, which has different diameters D(exit side), D(entry side) at relative maximum diameter portions, left and right roll shoulder portions, as a straightening roll of a straightener, wherein the roll shoulder having a smaller diameter is disposed to be located on the tube entry side. The straightening roll used therefor comprises roll shouldersandand a roll barrel portion, in which D>Dand 0.004≦(D−D)/d≦0.2 (d: outer diameter of tube to be straightened) are satisfied. Further, an aspect of the invention may define radii of curvatures of entry-side and exit-side shoulder potions in a section of the roll cut along a plane including the roll central axis, or a curve representing an outer surface of the roll barrel portion.