Method of making a metallic bellows
US6820317B2 · kind B2 · utility
8Cited by
4References
12Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 7, 2003 |
| Grant date | Nov 23, 2004 |
| Priority date | — |
| Expiry date | Jun 14, 2023 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/12292
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
In a method of fabricating a bellows by bulge forming, an annealing step is carried out during the bulge forming process of the bellows so that the capability of the material to elongate is recovered, and the workability of the bellows is improved in effect. In particular, the ratio of the outer diameter to the inner diameter can be made greater than a value that can be achieved by a single forming step. Therefore, the deflection (stroke) of each annular bulge or pleat can be increased for a given stress or the number of annular bulges and the length of the bellows can be decreased for a given stroke of the bellows.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.