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Tuesday, 12 November 2013

Hot-Working Processes - Hot processing

Hot processing
Points : Hot processing, Definition Definition Hot-pressing is a development of the drop-forging process, but is generally applied in the manufacture of more simple shapes. The hammer of drop-forging is replaced by a hydraulically driven ram, so that, instead of receiving a rapid succession of hammer blows, the metal is gradually squeezed by the static pressure of the ram. This downwards thrust is sometimes as great as 100 MN.


The main advantage of hot-pressing over a drop-forging is that working is no longer confined to the surface layers, as it is with drop-forging, but is transmitted uniformly to the interior of the metal being shaped. This is particularly important when forging very large components, such as marine propeller shafts which would otherwise suffer from having a non-uniform internal structure.

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