Pressing method and punch and die press for the same
US4689979A · kind A · utility
33Cited by
10References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 20, 1984 |
| Grant date | Sep 1, 1987 |
| Priority date | — |
| Expiry date | Dec 20, 2004 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB21D22/205
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A method of pressing a blank comprises the steps of pressing the blank between a die assembly having a cavity with a highly viscous substance contained therein and a punch, inserting the punch into the cavity to increase a pressure of the highly viscous substance in the cavity, and pressing the blank against a surface of the punch under the pressure of the highly viscous substance. The pressing method can form pressed product of complex shape highly accurately and free from cracks, wrinkles, or other damages. There is also disclosed a punch and die press suitable for effecting the abovesaid pressing method.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.