C - Chemistry – Metallurgy – 21 – D
Patent
C - Chemistry, Metallurgy
21
D
38/22, 57/23
C21D 9/00 (2006.01) H05B 6/02 (2006.01)
Patent
CA 1094333
T-5901 APPARATUS AND METHOD FOR HEATING FERROMAGNETIC ABRASIVE SHOT Abstract of the Disclosure There is provided an apparatus and method for heating ferromagnetic abrasive shot to a selected temperature sub- stantially 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 cy- lindrical surface portion of the central passage. The 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 in- ductor 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 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 resort as the resort 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.
258956
Gowling Lafleur Henderson Llp
Park-Ohio Industries Inc.
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