Process and apparatus for heat treating articles while hardening in gaseous medium
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United States of America Patent
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-
Oct 27, 1992
Grant Date -
N/A
app pub date -
Apr 4, 1991
filing date -
Apr 4, 1990
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Process for heat treating articles by hardening them in a recirculating gas medium which is in contact with the treated articles, the hardening gas being cooled by means of a heat exchanger, of the type in which helium is used as hardening gas, and is stored under holding pressure in a buffer container, wherein at the end of a hardening operation, a helium load is extracted from the treatment enclosure, in final phase by means of pump until a primary vacuum is obtained, the extracted helium is brought to purifying pressure by means of a compressor associated to a mechanical filter, and the helium under purifying pressure is sent to a purifier in which impurities are removed, after which it is transferred, if desired, after recompression in the buffer container.
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