L&L Special Furnace Co. manufactured two high-uniformity box furnaces for a U.S.-based manufacturer of wind-turbine components with facilities in Germany and Japan. The primary purpose of the furnace is to remove a cutting residue left on turbine parts after machining. The parts are placed in the furnace and heated to 1000°F. The furnaces, which are also used for tempering and other thermal processes up to 1875°F, have a work envelope of 48 inches wide x 60 inches high x 60 inches deep. There is a cast alloy hearth and hydraulic loader for easy loading and unloading.
The furnace has an automated variable-speed controlled exhaust system. At a certain point in the process when the cutting residue is at a critical temperature the exhaust system activates. A series of slide dampers under the furnace open and allow fresh air into the furnace while exhausting the cutting-residue fumes. The furnaces are heated from four sides and have lightweight high-density castable piers for hearth support.