Method and apparatus for operating a hydraulic ram
US5435216A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 28, 1993 |
| Grant date | Jul 25, 1995 |
| Priority date | — |
| Expiry date | Jul 28, 2013 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T83/8858
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A method for controlling punch strokes of a punch press machine includes the step of performing a first punching operation with a punching tool wherein a sheet of material is in a first preselected position. A second punching operation is then initiated with the punching tool at a variable hover height before the sheet of material reaches a second preselected position. The variable hover height of the punching tool is determined by the distance between the first and second punching operations. If the sheet reaches a predetermined in-position zone before the punching tool reaches maximum hover height, the ram changes direction moving downward. The punch reaches the material just prior to the work piece coming to a stop thereupon performing the next punching operation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.