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Machine translation
1. (WO1980002698) CONTROL OF THE COMPOSITION OF THE ATMOSPHERE OF A HEAT TREATMENT OVEN
Latest bibliographic data on file with the International Bureau   

Pub. No.:    WO/1980/002698    International Application No.:    PCT/DE1980/000087
Publication Date: 11.12.1980 International Filing Date: 09.06.1980
IPC:
C21D 1/76 (2006.01), C23C 8/06 (2006.01), C23C 8/24 (2006.01), G05D 21/02 (2006.01)
Applicants:
Inventors:
Priority Data:
2923285 08.06.1979 DE
Title (EN) CONTROL OF THE COMPOSITION OF THE ATMOSPHERE OF A HEAT TREATMENT OVEN
(FR) COMMANDE DE LA CONSTITUTION DE L"ATMOSPHERE D"UN FOUR DE TRAITEMENT A CHAUD
Abstract: front page image
(EN)The control of the composition of the atmosphere of an oven for the nitridation of the surface of ferrous workpieces or similar by means of a gas containing hydrogen or ammoniac, comprises an ammonia cracking plant which introduces at least one part of the gas containing ammonia in the chamber (1) of the oven. An adjusting member (13, 14) controls the flow of the cracked ammonia towards the oven as a function of measured values which are provided by a sensor (12) from the gases samples continuously from the oven and by means of an appropriate electric circuit. To comply with the different operation conditions in a simple way and to take into account automatically all the essential parameters of the process for appropriately effecting the nitridation, the adjusting member (13, 14) controlling the supply of cracked ammonia cooperates, upstream, with a programmer (16) which provides to the adjusting member (13, 14) an order value depending on the programme. Thus, the programmer (16) controls in addition the adjusting member for the supply of cracked ammonia to the oven (1) and a temperature regulator (17) of the oven (1) by means of a programme order value.
(FR)La commande de la constitution de l"atmosphere d"un four pour la nitruration de la surface de pieces ferreuses ou analogues au moyen d"un gaz contenant de l"hydrogene ou de l"ammoniac, comprend une installation de craquage de l"ammoniac (10) qui introduit au moins une partie du gaz contenant de l"ammoniac dans la chambre (1) du four. Un organe de reglage (13, 14) commande le debit de l"ammoniac craque vers le four en fonction de valeurs mesurees qui sont fournies par un capteur (12) a partir de gaz preleves continuellement dans le four et au moyen d"un circuit electrique approprie. Pour pouvoir satisfaire de facon simple les differentes conditions operatoires et pour tenir compte automatiquement de tous les parametres du procede essentiels pour le bon deroulement de la nitruration, l"organe de reglage (13, 14) commandant l"alimentation en ammoniac craque coopere, en amont, avec un programmeur (16) qui fournit a l"organe de reglage (13, 14) une valeur de consigne dependant du programme. Ainsi, le programmeur (16) commande additionnellement l"organe de reglage pour l"alimentation en ammoniac craque du four (1) et un regulateur de temperature (17) du four (1) au moyen d"une valeur de consigne programmee.
Designated States:
Publication Language: German (DE)
Filing Language: German (DE)