Press forging is a variation on the forging process. Rather than the metal workpiece being ‘hit’ with a single or multiple blow, the forming process is more akin to the kneading of bread. A high-power press is used to squeeze the metal into a new shape or section size. Press forging is most commonly used as the first shaping process of large, cast ingots to close-up any internal voids and make a bar more suitable for further forging. After press forging, the metal workpiece will normally be returned to a reheat furnace, to bring it up to temperature ready for hammer or die forging.
The biggest advantage of press forging lies in its ability to deform the workpiece through its section thickness. Hammer forging will only affect the surface of the workpiece whereas press forging will change the shape and interior of the workpiece too. Press forging is also more controlled than hammer forging and provides a more uniform strain rate. As a slower process, there is a greater degree of control possible.
Here are some other advantages of press forging –
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