Two car-bottom industrial furnaces that will be used to cure aircraft engine hardware consisting of ceramic-metallic composite shapes have been shipped by Lindberg/MPH. Both furnaces heat a maximum 5,000 lb load. One unit heats from 200°F (93°C) to a maximum temperature of 2100°F (114°C). The second unit heats to 2800°F (1538°C).
The electrically powered furnaces utilize two heating systems: an auxiliary preheater with an air recirculation system to achieve uniform temperature at low temperatures, and radiant heating elements for uniform high temperature operation. The customer required temperature uniformity of ±20°F (±11°C) for an optimal cure.
The workloads are manually placed on a self-driven car and driven into the industrial furnaces. The recirculating blower pulls air from the preheater, recirculates it through the furnace and then back through the preheater again. A butterfly valve allows the preheater air piping to be bypassed and cool ambient room air to be pushed into the furnace chamber for fast cooling. Roof-mounted exhaust flues with air-cylinder-operated coves open during the low temperature curing process to vent fumes from the product as well as during the fast cooling process.