A North American manufacturer of punches and dies ordered a dual-chamber, fiber-lined furnace to process small parts in wire baskets and parts wrapped in foil during hardening. The upper chamber heats to 2200°F (1205°C), and the lower draw chamber heats to 1600°F (870°C) with 23 kW of power.
Lucifer Furnaces, Warrington, Pa., manufactured the unit. Heat radiates from coil-wound heating elements mounted on ceramic rods, which are completely external of the insulation and can be accessed for individual replacement. The lower draw chamber is insulated with 2.5” of insulating firebrick, and both chambers are further insulated with cold face backup insulation. Each chamber is individually operated with separate digital controls and thermocouples.