Method of controlling continuous carburization furnace

Details Method of controlling continuous carburization furnace Method of controlling continuous carburization furnace

1992-06-18

1993-07-27

Reynolds, Bruce A.

Industrial electric heating furnaces

Resistance furnace device

Control

266 80, 266 90, 148215, 432 37, 364477, C23C 1112, H05B 102

Patent

active

052316459

ABSTRACT:
In the continuous carburization furnace in which the temperature of the heaters can be controlled individually at every carburization processing position; carburization reference data at each carburization processing position is read; a temperature and carbon potential at each position at least during carburization and diffusion processes is detected; a carburized quantity of the processed member at each position is calculated with reference to the detected temperature and carbon potential; a carburization history is calculated by integrating the carburized quantity at each position of the carburization processed member, and a carburizing condition at a next carburization processing position is determined depending on a difference between the carburization history at the time of terminating the carburization process at each position of the carburization processed member and the carburization reference data at each position. In this way, a fluctuation of the carburizing condition based on a history of the carburization degree at each carburizing position is reduced and the productivity rate of the continuous carburization furnace is improved without stagnation of processing even upon changing a carburizing condition.

REFERENCES:
patent: 3868094 (1975-02-01), Hovis
patent: 4257767 (1981-03-01), Price
patent: 4306919 (1981-12-01), Roberge et al.
patent: 4501552 (1985-02-01), Wakamiya
patent: 4605161 (1986-08-01), Motomiya et al.

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