Method for straightening tube and straightening roll
US8783085B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 20, 2012 |
| Grant date | Jul 22, 2014 |
| Priority date | — |
| Expiry date | Aug 20, 2032 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB21D3/02
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.