Box Furnace for Auto Safety Components

Lucifer Furnaces, Inc. (Warrington PA) has designed a furnace to meet the heavy loads of a supplier of automotive safety equipment. The Model DL7-R24 is a box furnace with a chamber size of 24 in H x 24 in W x 24 in L that was customized to support a 1,000 lb load of molds for heat treating at 750 deg F. Starting with a reinforced angle iron steel frame with heavy gauge sheet steel facing welded to form a rigid unit, the furnace is lined with 6½ in insulating firebrick and mineral wool block on side walls and below hearth. Ceramic fiber pyroblock modules line the roof. Coiled wire heating elements in easy-to-replace holders are located on both side walls as stacked arrays. A special 1½ in thick hearth plate was designed to sit atop heavy-duty piers to support the load, protect the floor insulation and provide a flat working surface. Safety features onboard include an auto-disengage feature to shut off power to heating elements when door is opened to eliminate electric shock hazard. Controls include a Honeywell DC2500 microprocessor-based digital time-proportioning temperature controller programmed with a single setpoint heat ramp. This furnace, part of the Series 7000 general purpose box furnaces, will be used for annealing steel and stress steel relief of die cast tool.

Lucifer Furnaces, Inc., 2048 Bunnell Road, Warrington, PA 18976, 800-378-0095, ljones@luciferfurnaces.com, www.luciferfurnaces.com.