Die cushion controller
US7331208B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 27, 2005 |
| Grant date | Feb 19, 2008 |
| Priority date | — |
| Expiry date | Oct 27, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05B2219/45131
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A die cushion controller uses position control to position die cushion members for placement of a metal sheet. A pressing process starts and the upper die is lowered. When a position detector detects a position at which the upper die touches the sheet metal, the die cushion controller switches over from position control to pressure control and applies a preset pressure to the sheet metal. When the position detector detects that the upper die has risen to a preset position, the die cushion controller clears the positional deviation accumulated in position control to zero, then moves the die cushion members to preset positions and holds them there.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.