Electrically heated pit furnace used for aerospace fasteners

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L&L Special Furnace Co.’s model PT2036 Cyclone pit furnace for annealing aerospace fasteners. (Courtesy: L&L Special Furnace Co.)

L&L Special Furnace Co., Inc. has manufactured a fourth high-uniformity, pit-style furnace used for annealing. This furnace has been supplied to an industry leader that manufactures aerospace fasteners and supplies to a worldwide client base.

The annealing process occurs when the parts are evenly heated to 1,400°F/760°C and held for a predetermined amount of time. Temperature uniformity is critical to this process, and both ambient and load temperature must maintain ±10°F throughout the cycle.

The furnace is manufactured in accordance with the ASM2750E pyrometry specification. All thermocouple reference ports along with TUS survey ports and recording devices are included.

There is a five-horsepower, air-cooled turbo convection fan included to aid in temperature uniformity. The system is controlled by Eurotherm controls and a recorder with SCR power controls. There is an audible/visual stack light and element branch indicator located on top of the control panel. The branch indicator is a visual indicator to tell that all the elements in the furnace are working correctly.

The fastener parts are placed in baskets and loaded by an overhead crane into the furnace. There are guide bars to ensure that the load is centered and cannot damage the furnace liner.

The program or recipe is entered into the program control, and the cycle is started. At the completion of the cycle, the parts are removed and are ready for inspection and shipment.

This furnace is ideal for production facilities where the operators have sole control of their heat-treating cycle. Options include a variety of control and recorder configurations. All units come with a three-day, all-inclusive startup service available within the continental United States and Canada. International startup and training services are available by factory quote.

The furnace has been surveyed and is capable of ±10°F from 300°F to 1,750°F throughout the work envelope of 20” in diameter by 36” deep. L&L also has many other sizes available.

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