Free forging is a plastic working method that shapes heated metal materials by hammering or pressing them without using molds, stretching or compressing them. By repeatedly deforming the material, its internal structure is densified and homogenized, significantly improving mechanical properties such as strength, toughness, and fatigue resistance. It is primarily suitable for large parts, prototypes with complex shapes, and small-batch, multi-product production, and is used for wind turbine shafts, marine crankshafts, pressure vessel components, and aircraft parts. A major feature is that it eliminates the need for mold production, thereby reducing initial costs, while also decreasing internal defects in the material.