Apparatus for blanking thin sheets using a punch having localized regions of hand and soft elastic material
US4856399A · kind A · utility
5Cited by
5References
11Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 17, 1988 |
| Grant date | Aug 15, 1989 |
| Priority date | — |
| Expiry date | May 17, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31551
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
In an apparatus for blanking out a sheet material (1) between a punch (4) and a die (6) having a sharp edge (7), the punch (4) is formed by a heterogeneous composite elastic material having localized regions (4a) having a relatively higher hardness, and complementary regions (4b) having a relatively lower hardness.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.