Method for producing a rifled tube
US10632521B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Nov 24, 2015 |
| Grant date | Apr 28, 2020 |
| Priority date | — |
| Expiry date | Sep 24, 2036 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF28F2210/06
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
The production method for producing a rifled tube, which includes a plurality of first helical ribs on its inner surface, includes: a steps of:preparing a steel tube; and producing a rifled tube by performing cold drawing on a steel tube by using a plug which includes a plurality of second helical ribs, the plug satisfying Formulae and: 0.08 <W×(A−B)×N/(2π×A)<0.26 (1)0.83<S×(A−B)×N/(2×M)<2.0 (2) where, W is a width of a groove bottom surface of the helical groove; A is a maximum diameter of the plug; B is a minimum diameter of the plug; N is a number of the second helical ribs; S is the width of the groove bottom surface; and M is a pitch of adjacent second helical ribs.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.