Lucifer Furnaces, Warrington, Pa., has delivered a Red Devil RD8-KHE24 furnace to Precision Solutions, Richmond, Utah. The dual chamber unit has working dimensions of 12 by 14 by 24 in., for both the upper and lower chambers.
The upper hardening chamber reaches 2200°F, while the lower tempering oven heats to 1200°F. Both chambers are lined with a multilayered 4.5-in. combination of lightweight firebrick hotface insulation, and mineral wool backup insulation for energy-efficient operation. The firebrick is precision dry fit inside the chamber, with staggered seams for reduced heat loss while allowing for thermal expansion.
Both chambers contain heating elements comprising coiled, heavy gauge wire of low watt density, mounted in replaceable side wall panels. The lower chamber has a rear mounted fan for uniform circulation of heat. Hearth plates in both chambers support the workload and protect floor brick.
Insulated horizontal swing doors feature cam locks for a tight seal and safety microswitches to shut off power when doors are opened. Vertical lift doors and over-temperature safety systems are also available as options. Ceramic hearth plates protect the floor and can support a workload ranging to 25 lbs/ft.2 of hearth. A high-volume recirculating fan is mounted in the rear of the tempering oven for horizontal air flow, providing uniform heat for stress relief and other applications.
