Device and method for strengthening thin-walled straight pipe
US11141773B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 18, 2021 |
| Grant date | Oct 12, 2021 |
| Priority date | — |
| Expiry date | Mar 18, 2041 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB21D26/033
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A device for strengthening a straight pipe, including a first positioning mold, a second positioning mold, a split mold, a rounding mold, a first cavity and a second cavity. A method for strengthening a straight pipe is further provided. The split mold is adjusted to position the pipe. The pipe is inserted into the first and second positioning molds. First and second sealing rings are arranged in an inner cavity of the pipe. Hydraulic oil is injected into the first cavity to expand the pipe to perform an expanding deformation. When the hydraulic oil is unloaded, the split mold moves towards an axis of the first positioning mold to perform a reducing deformation. After the expanding and reducing deformations, the pipe is transported into the rounding mold, and hydraulic oil is injected into the second cavity to expand the pipe to perform the rounding.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.