Press forming die set and method
US7861568B2 · kind B2 · utility
3Cited by
2References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 4, 2008 |
| Grant date | Jan 4, 2011 |
| Priority date | — |
| Expiry date | Aug 28, 2028 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB21D25/04
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A die set for press-forming a blank of thin metallic sheet. The die set has a punch and a blank holder. The blank holder has a first bead for restraining an edge of the blank with a constant force. The first bead is disposed further to an inside than a second bead for restraining the edge of the blank with a force that varies during pressing of the blank.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.