1. Open Forging (free forging). The use of impact or pressure to make the metal in the upper and lower two iron (anvil) between the deformation to obtain the required forgings, mainly hand forging and mechanical forging two kinds.
2. Closed mode forging. The metal billet can be divided into die forging, cold upsetting, rotary forging, extrusion and so on when it is pressurized and deformed in a forging chamber with a certain shape. Forging according to deformation temperature can also be divided into hot forging (processing temperature higher than billet metal recrystallization temperature), warm forging (lower than recrystallization temperature) and cold forging (normal temperature) ...
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