Die cushion device for press machine
US9132463B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 13, 2010 |
| Grant date | Sep 15, 2015 |
| Priority date | — |
| Expiry date | Jan 22, 2034 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB21D24/02
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A die cushion device includes: a cushion pad which is located below a blank holder and is movable up and down while being synchronized with the blank holder; a linear driving device which drives a brake member along a predetermined line and regenerates energy from the linear movement of the brake member by combination of a servo motor and a conversion mechanism; and a hydraulic speed change device which transfers the speed of the cushion pad to the brake member via the pressure of hydraulic fluid while increasing the speed and transfers the speed of the brake member to the cushion pad via the pressure of the enclosed hydraulic fluid while decreasing the speed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.