Method for press punching a hole in sheet metal and press die
US8087333B2 · kind B2 · utility
26Cited by
37References
6Claims
0Family size
Assignees
Inventor
Key dates
| Filing date | Dec 17, 2002 |
| Grant date | Jan 3, 2012 |
| Priority date | — |
| Expiry date | Dec 17, 2022 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T83/9428
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A punch unit for a press die is provided for punching a hole in sheet metal. The punch unit includes a piercing punch provided with a sharp projection, a plunger for pressing the piercing punch, a cylinder for supporting the piercing punch and the plunger slidably in a punching direction, and a coil spring for retracting the piercing punch and the plunger. Also disclosed is a press die for punching a hole in sheet metal using the punch unit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.