Device for correcting die spacing at bottom dead center of a press
US5269163A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 29, 1992 |
| Grant date | Dec 14, 1993 |
| Priority date | — |
| Expiry date | Jun 29, 2012 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB30B15/0041
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
An apparatus for use with a press which corrects the spacing between an upper die and a lower die when the press is at bottom dead center. The apparatus includes a detector which is operative during each cycle of reciprocal movement of the press slide to detect the spacing between the upper and lower dies, a comparator which compares the detected spacing during each cycle with a prior spacing, an axially expansible/contractible piezoelectric actuator mounted on the press so that its axial length affects the spacing between the upper and lower dies when the press is at bottom dead center, and a drive circuit which is responsive to a deviation signal from the comparator to drive the actuator with a high voltage so as to expand or contract its axial length according to the difference between the detected and prior spacing of the dies.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.