Lindberg MPH, Riverside, Mich., has shipped three natural-gas-fired box furnaces to a parts manufacturer for the oil and gas industry to develop process control requirements for heat-treating and stress relieving of underground mining/drill heads. These types of mining/drill heads last only a few hours to a few days, depending on the composition of the ground. The goal is to double the life of the tooling through research that would revolutionize industry standards.
The maximum operating temperature rating for the stress-relieving box furnaces is 2050°F, and work chamber dimensions are 36x20x24 inches. The box furnaces were designed to meet a temperature uniformity of +/-15°F at 1700°F and 2050°F, per the requirements of AMS 2750E, Class 3 furnaces and Instrumentation D.
The stress-relieving box furnaces utilize automatic chamber pressure controls and space-saving rear-mounted burners. To accommodate the tight floor spacing requirement, specialized burner passages were customer-designed to provide convection heating while eliminating flame impingement on the part.
“The chamber pressure control for these box furnaces, which is a positive internal pressure that is maintained throughout the entire range of the furnace input, increases temperature uniformity and lowers operating costs,” says Kenneth Zielke, Sales Engineer.
Unique features of these Lindberg MPH heat treating box furnaces include:
