Method for molding screw thread of metal pipe
US12121949B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 4, 2020 |
| Grant date | Oct 22, 2024 |
| Priority date | — |
| Expiry date | Jun 3, 2041 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB21D51/38
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
After holding a metal pipe 10 using a clamping die 5, a primary formed portion 11a corresponding to the preforming surface portion 5c is formed on the metal pipe 10 by pressing an end portion of the metal pipe 10 with a pressing die 6 in a direction of a cylinder center line C1. A final formed portion 11b is formed on the metal pipe 10 by moving an outer forming die 7 to press an outer circumferential surface of the metal pipe 10 with the outer forming die 7 after aligning a rib portion 7c with the primary formed portion 11a, while moving an inner forming die 8 to press an inner circumferential surface of the metal pipe 10 with the inner forming die 8 after aligning a recessed groove portion 8c with the primary formed portion 11a.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.