Apparatus and method for heating ferromagnetic abrasive shot

Electric heating – Metal heating – Of cylinders

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Details

148150, 219 1065, 219 1061, 219 1071, 266252, 432 82, 219 1041, H05B 502

Patent

active

040397947

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 through the retort as the retort is being rotated for first heating the shot to a temperature below the Curie Point temperature of the shot and then to a temperature above the Curie Point of the shot.

REFERENCES:
patent: 1975437 (1934-10-01), Sorrel
patent: 2408190 (1946-09-01), Baker
patent: 2513778 (1950-07-01), Bailey
patent: 3039753 (1962-06-01), Eketord et al.
patent: 3150224 (1964-09-01), Libman
patent: 3180917 (1965-04-01), Morrison et al.
patent: 3318591 (1967-05-01), Holcroft
patent: 3362857 (1968-01-01), Stewart

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