Process and press with a controlled pressure system
US4588539A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 4, 1985 |
| Grant date | May 13, 1986 |
| Priority date | — |
| Expiry date | Feb 4, 2005 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB31B50/592
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A press for forming sheet material into a shaped article comprising a frame, first and second complementary dies, a cam supported by the frame for reciprocally moving the first die along an axis between a first position axially spaced from the second die and a second position fully mated with the second die, the cam including a dwell period when the first die is in the second position. The press includes a bolster supporting the second die for axial movement between upper and lower limits, the bolster being axially spaced from the upper limit by movement of the first die to the second position. The press also includes a hydraulic power circuit responsive to the position of the cam for normally biasing the bolster toward its upper limit under a first hydraulic pressure and for biasing the bolster toward the upper limit under a second hydraulic pressure during the dwell period, the second hydraulic pressure being greater than the first hydraulic pressure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.