Method and apparatus for the automatic monitoring of operating s

Details Method and apparatus for the automatic monitoring of operating s Method and apparatus for the automatic monitoring of operating s

1991-10-07

1993-07-06

Kastler, Scott

Metallurgical apparatus

Process

266 87, 266 96, 266250, 266 82, F27B 518

Patent

active

052251420

ABSTRACT:
In a vacuum heat treating oven operating with hydrogen under pressure as the cooling medium, especially for the quenching of greatly heated metal workpieces (5), a method is provided for the automatic control of the progress of the process and for monitoring safety of operation. The housing (4) of the heat treating oven is for this purpose connected to gas inlet lines (9 and 10), one for the admission of the cooling gas and one for the admission of the flushing gas (H.sub.2 and N.sub.2, respectively), and also to a vacuum line (17) and to a gas outlet line (11) into each of which gas sensors (24, 39, 42) are inserted, which during the quenching process signal the gas concentration to a central processing unit (41) which also is connected to pressure sensors (19, 20) and a gas sensor (21) which issue additional signals concerning the gas pressures prevailing in each instant in the interior of the housing (4) or gas inlet line (10) and concerning the gas concentration in the environment of the oven to the central processing unit (41), which then in turn, according to preset programs, actuates the gas inlet and gas outlet valves (25, 30, and 18, 28, respectively) and turns on or off the motor-blower unit (12, 13) and the heating unit (15, 15a, . . . ).

REFERENCES:
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patent: 4191598 (1980-03-01), Conybear et al.
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patent: 4610435 (1986-09-01), Pfau et al.
patent: 4643402 (1987-02-01), Brahmbhatt
CH-Z: Pock, Ernst: Luft im Ofen unerwunscht. In: Technische Rundschau Feb. 1990, S.28-33.

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