Process for preventing the formation of deposits in a discharge nozzle during teeming of molten metal
US4909422A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 21, 1986 |
| Grant date | Mar 20, 1990 |
| Priority date | — |
| Expiry date | Feb 21, 2006 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB22D41/58
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Molten metal is teemed through a discharge nozzle controlled by a shut-off device during which inert gas is injected into an inlet portion of the discharge nozzle. A reduction of the cross section of the discharge nozzle due to the formation therein of deposits is prevented by injecting at least a portion of the inert gas into the inlet portion in a pulse-like manner by controlling the supply of the inert gas with respect to time and volume. The inert gas may be supplied from a source as partial volumes through plural branch lines each provided with shut-off and control valves, and the operation of such valves may be programmed to control the duration and repetition period of the supply of each partial volume.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.