To provide a quality control method in vacuum carburizing where the quality in carburizing can be controlled by controlling a carburizing depth to a work, reproducibility is improved by obtaining a desired carburizing depth, variation in carburizing quality is reduced, so as to secure its uniformity, and the control of carburizing quality can be easily performed, and to provide a vacuum carburizing furnace.
The vacuum carburizing furnace 10 is provided with: hydrogen partial pressure detection means (30, 32, 34) where a hydrogen partial pressure ratio to the whole pressure in a treating chamber 17 upon carburizing treatment is detected; an operation treating means (34) where treatment is performed in such a manner that, based on the time change of the hydrogen partial pressure ratio, a carbon inflow rate Ci(t) to the work 1 is found, and, based on the carbon inflow rate Ci(t), the estimate of the carburizing depth in the work 1 is found; and output means (36, 38) where the carburizing depth of the work 1 found by the operation treating means is displayed.
TAKAHASHI JINICHIRO
ISHIGE KENGO
SHIGEGAKI YASUHIRO
| JP2004332075A | 2004-11-25 |
Yasuharu Nakasone
Toshihiro Nomura
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