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Pressed Aircraft Pistons
Part 2: Heat-treatment, Laboratory Control, Advantages of the Pressing Process

This article first appeared in the Volume 6, Number 65 (March, 1944) issue of Aircraft Production magazine, and is presented here through the kind permission of Flight International. Thanks also to Bruce Vander Mark for furnishing volumes of Aircraft Production for scanning.


After the pistons have been formed in the press, it is necessary to carry out heat-treatment operations to produce the desired physical properties. For this purpose Specialloid Ltd, have installed a battery of Wild-Barfield furnaces and quenching tanks. The furnaces are rated at 120 kW and are of the vertical forced-air circulation type. Each furnace consists of a cylindrical steel case with the door gear framework fitted to the back. The doors are of the lift and swing type, with the main weight taken by, a patented spring suspension system that allows the door, though thickly insulated and of considerable weight, to be lifted and swung to one side with ease.

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