Method for removing strain from press-formed workpiece, and forming press
US6860135B2 · kind B2 · utility
2Cited by
4References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 6, 2003 |
| Grant date | Mar 1, 2005 |
| Priority date | — |
| Expiry date | Feb 6, 2023 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB21D25/00
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
In a forming press, a blank is pressed formed into a press-formed workpiece by means of an upper die and a lower die, while a peripheral edge portion of the blank is clamped by means of a die and a blank holder insert of the forming press. Subsequently, a central portion of the press-formed workpiece is partially held by means of the upper die and the lower die so as to draw a peripheral portion of the press-formed workpiece away from the central portion thereof, thereby removing strain from the press-formed workpiece.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.