Apparatus for the zone-annealing of a workpiece consisting of a high-temperature material
US4583720A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 24, 1984 |
| Grant date | Apr 22, 1986 |
| Priority date | — |
| Expiry date | Oct 24, 2004 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC21D1/26
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
An apparatus and a process for the zone-annealing of a workpiece (1) consisting of a high-temperature material, in which the workpiece (1) is hung on a suspension device (2) actuated via a roller (3) driven by a drive motor (4) and is provided with a plate-shaped covering screen (10) having an orifice. For the dipping of the workpiece (1), there is underneath the latter a salt bath (5) which is enclosed in an insulating vessel (6) and is provided with a heating system (7) with centrally symmetrical guide plates (8) and which is closed off at the top by means of a floating insulating cover (9). The cooling of the part of the workpiece (1) which is not immersed is guaranteed by a cooling body (11) through which cooling air (14) flows and which has a central passage (12) and, at the lower end of the passage (12), a projecting edge (13) serving as a stop for the covering screen (10). The intended grain structure can be adjusted when the feed speed of the workpiece (1) is varied in portions by means of a drive motor (4) and the amount of cooling air (14). The lateral heat flux is reduced by means of jacket-like heat-insulating cladding of the workpiece (1).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.