Vacuum die-casting machine with apparatus and method for controlling pressure behind piston
US5246055A · kind A · utility
17Cited by
18References
24Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 6, 1991 |
| Grant date | Sep 21, 1993 |
| Priority date | — |
| Expiry date | Sep 6, 2011 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22B21/06
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A vacuum die-casting machine has a bellows forming a sealed enclosure between the rear of the fill chamber and the piston rod. A vacuum is applied to the enclosure during evacuation of the die cavity and charging of the fill chamber with molten metal. As the piston moves forward, an inert gas at about atmospheric pressure is introduced into the enclosure and extends into the feed tube.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.