Method for hot pressing of workpieces
US6286350A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 19, 2000 |
| Grant date | Sep 11, 2001 |
| Priority date | — |
| Expiry date | Oct 19, 2020 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB21J13/14
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A hot-forming machine for the hot-pressing of workpieces comprises a die (5), an associated extendable and retractable ejector (7) and a forwardly and backwardly movable press ram (1). The ejector (7) is connected to a control piston (8) arranged displaceably in a pressure chamber (28). Liquid can flow out of the pressure chamber (28) via a liquid outlet bore (24) and a liquid discharge line (23). By means of a throttle (25) arranged in the liquid discharge line (23) the outflow of liquid and therefore the repulsion of the extended ejector (7) by the forwardly moving press ram (1) are delayed in such a way that a workpiece (4) arranged between ejector (7) and press ram (1) is pre-upset and descaled outside the die (5).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.