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AssigneeNippon Steel & Sumitomo Metal Corporation
InventorsYoshiyuki Kuroiwa, Kouichi Kuroda, Tomio Yamakawa
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A method for straightening a tube by using an asymmetric roll, which has different diameters D1 (exit side), D2 (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 shoulders 3a and 3b and a roll barrel portion 4, in which D1>D2 and 0.004≦(D1−D2)/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.
A method for straightening a tube by using a straightener in which three or more pairs of rolls, each pair being formed of two rolls oppositely disposed in a vertical direction, are back-to-back disposed along a traveling direction of a tube to be straightened, wherein
A method for straightening a tube by using a straightener in which plural pairs of rolls, each pair being formed of two rolls oppositely disposed in a vertical direction, are disposed with a single roll being interposed between the plural pairs of rolls and being located at either of upper and lower positions, wherein
Dependencies are inferred from the claim text.