Retort furnace for thermal treatment of metallic workpieces

摘要

The retort furnace (1) for the thermal treatment e.g. bright start treatment of nitride or nitrocarburized metallic workpieces, comprises a horizontally laid metallic tubular retort (3), and a furnace housing (2) surrounding the retort. The retort has gas-tight closable treatment chamber or a charging chamber (10) receiving the protective gas and the reactive gas for the thermal treatment of the workpieces, and a charge and a receiving frame (8) positioning as charging reception to the retort. The weight of the charge and the receiving frame is coupled by the retort. The retort furnace (1) for the thermal treatment e.g. bright start treatment of nitride or nitrocarburized metallic workpieces, comprises a horizontally laid metallic tubular retort (3), and a furnace housing (2) surrounding the retort. The retort has gas-tight closable treatment chamber or a charging chamber (10) receiving the protective gas and the reactive gas for the thermal treatment of the workpieces, and a charge and a receiving frame (8) positioning as charging reception to the retort. The weight of the charge and the receiving frame is coupled by the retort. The receiving frame is hangingly connected with units at the furnace housing for supporting. The units are gas-tightly led to a wall of the furnace housing and to a wall of the retort (3.1) in passages. The units are supported to the receiving frame and to a cross element over joints at the furnace housing. The passages in the walls have embedded tubes with length compensators. The tubes are arranged to a cool bag and have insulators. The tubes embedded in the walls are separated into a first or lower part and a second or upper part by detachable flange connections. The first or lower part is embedded in one of the walls and the second or upper part is embedded in the cross element. The second or upper part is a gaiter sleeve undertaking the function of the compensators. The cool bag is arranged to the first or lower part. A building unit forming the tubes is exchangeably arranged with the compensators. The retort is detachable with the units from the furnace housing without dismantling. The wall of the furnace housing has a segment detachably arranged to an area of the passages.