A US manufacturer of radio frequency (RF) and microwave components recently received a small box furnace reaching 2300°F. This furnace will be used for precision heating to anneal their parts before milling.
The small load custom box furnace was delivered by Lucifer Furnaces. It is their furnace model HL7-A12 with a 6” x 6” x 12” chamber and is insulated with a combined 5” hot face insulating firebrick and cold face mineral wool backup. This box furnace is complete with a cast hearth plate to protect the floor insulation and heats with easy-to-replace coiled heating elements in cast assemblies for easy replacement, while still being built at the same quality as larger models.
Controls include a Honeywell digital time proportioning temperature controller and a TP1 Soak Timer which starts when the furnace reaches setpoint temperature and shuts off the elements at the end of the heating cycle. A door safety switch automatically disengages power to the elements when the door is opened. This furnace is part of Lucifer’s standard, general purpose, series 7000 box furnace line, a line which helps bring clients’ heat treating in-house and gain control over work flow and product quality.
