Spinning method for forming pipe end
US8683843B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 15, 2008 |
| Grant date | Apr 1, 2014 |
| Priority date | — |
| Expiry date | Nov 23, 2030 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB21D22/14
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A spinning method for forming pipe bodies of varying diameter. In the spinning method, when a necked portion is formed at the end of the pipe material by the spinning method, working rollers are restricted so as to return immediately before the pipe end instead of being allowed to axially move beyond the end of the working object pipe. The amount of diameter reduction at the pipe end is set to be smaller than that of the most diameter reduced portion connecting to the pipe end. A protruding portion of a so-called bellmouth shape is formed at the working end, thereby preventing generation of fractures originating at the working end of the base portion or the welded portion and generation of wrinkles during the spinning process.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.