Apparatus and method for heating ferromagnetic abrasive shot
US4039794A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 14, 1976 |
| Grant date | Aug 2, 1977 |
| Priority date | — |
| Expiry date | Jan 14, 1996 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B6/105
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
There is provided an apparatus and method for heating ferromagnetic abrasive shot to a selected temperature substantially above the Curie Point temperature of the metal forming the shot. An elongated generally cylindrical retort, having a central axis and a central passage and being formed from a magnetically permeable material having a Curie Point temperature, is divided into first and second axially spaced heating zones. Each zone is surrounded by a generally cylindrical surface portion of the central passage. A first inductor means is used for inductively heating the generally cylindrical surface portion of the first zone to a temperature below the Curie Point temperature of the retort material so that a major portion of the magnetic flux from the first inductor means is concentrated in the metal forming the retort. A second inductor means is used for inductively heating the generally cylindrical surface portion of the second zone to a temperature substantially above the Curie Point temperature of the retort material whereby a major portion of the flux from the second inductor means extends through the metal of the retort and into the central passage. The shot is conveyed throug…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.