L&L Special Furnace Co. Inc. commissioned a large resistance box furnace and quench tank in New Zealand for an aerospace manufacturer of landing gear and associated components. The furnace has an effective work zone of 22 inches high x 34 inches wide x 68 inches deep. The quench tank provided with the furnace is capable of quenching parts up to 24 x 36 inches in oil.
The furnace is equipped with a pyrometry package for AMS 2750E class 3 equipment. It includes a survey port, thermocouple reference ports and corner locations to record the high and low temperature points inside the furnace as indicated by the most recent survey. The furnace has a single control loop. The heating circuit is divided into six individual element banks with SCR power controllers and potentiometers to balance temperature gradients throughout the furnace.
The furnace includes a Eurotherm Nanodac temperature controller/paperless recorder, as well as a separate over-temperature-protection controller and paperless chart recorder with dedicated TUS software.