C - Chemistry – Metallurgy – 21 – D
Patent
C - Chemistry, Metallurgy
21
D
38/9
C21D 9/00 (2006.01) C23C 8/20 (2006.01) F27B 9/02 (2006.01) F27B 9/06 (2006.01) F27B 9/16 (2006.01) F27B 9/22 (2006.01) F27D 7/04 (2006.01)
Patent
CA 1291332
ABSTRACT OF THE DISCLOSURE A continuous carburizing furnace system is disclosed having at least two series-connected rotary furnaces. The rotary carburizing furnace, a rotary equalizing furnace, and a rotary diffusion furnace which may be included between the carburizing and equalizing furnaces, allow trays of parts to be discharged from any position at any time by suitable rotation of their hearths, thus allowing parts with different cycle times to be run simultaneously in each rotary furnace. Each donut-shaped rotary furnace includes one or more captive chain type pusher mechanisms mounted in vertical fashion within a central area or hole, and the rotary carburizing furnace is multi-zoned and includes wall-mounted fans for uniform circumferential control of the gaseous atmosphere within its annular chambers. Two different quenching apparatuses and a slow cool assembly adjacent multiple outlets of the equalizing furnace permit the use of different cooling/quenching processes on selected parts, and parts may also be returned from the slow cool assembly to the equalizing furnace for reheating.
562017
Keil Gary D.
Smith John W.
Holcroft/loftus Inc.
Ridout & Maybee Llp
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