Method for producing a hollow body made of metal
US6401509B1 · kind B1 · utility
Inventor
Key dates
| Filing date | Aug 25, 2000 |
| Grant date | Jun 11, 2002 |
| Priority date | — |
| Expiry date | Aug 25, 2020 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49805
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
The present invention relates to a method for manufacturing a hollow body made of metal whose cross sectional shape changes in longitudinal direction, a tubular slug being sealed at its end and being placed into a mold that corresponds to the desired shape and that is placed in a tool, said slug being then put under high pressure from the inside by means of a pressure means, whereas the two ends of the tube are pressed against each other in axial direction during the process of deformation, the slug being submitted during deformation to a higher temperature in the area of these great deformations than in the area of smaller deformations in order to produce areas with great deformations in its cross sectional shape.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.