Midland-ross Corporation

Wallace J Titus

James G Conybear

Frederick E Zahn

David L Checkley

A method and apparatus for recirculation of atmosphere in a vacuum furnace which comprises a recirculation loop in which there is a low pressure line from the furnace chamber leading to a recirculation pump which pumps the recycled gas at a higher pressure to a high pressure line back into the furnace chamber. A means to analyze the furnace atmosphere is in communication with the high pressure line and signals its measurements of the atmosphere analysis to a valve on an enriching line. The enriching line passes enriched gas into either the high pressure line or the furnace chamber as the valve opens or closes. A means is provided to withdraw the gas from the furnace chamber in order to maintain the desired furnace chamber pressure as enriching gas is added.

Jet recirculation method for vacuum carburizing

A vacuum furnace having a single chamber in which a workpiece is supported and heat treated. A unique cooling system is designed for adaption with the low pressure/high volume radial flow fan which is positioned interiorly of the furnace adjacent the vertically uppermost portion of the chamber. The system includes an exhaust opening in the top of the chamber and a plurality of small openings strategically located in the lower half of the chamber for improving the uniformity of the flow pattern of cooled gas circulated upwardly through the chamber for cooling a workpiece positioned in the chamber.

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Toledo, OH, United States of America

Wallace J Titus