Definition. Metal shaping process in which a hot piece of metal is hammered (forged) between the stationary part and the moving (dropping) part of a two-piece hollow metal die (called forging die) in one or several operations. Employed usually in manufacturing axles, crankshafts, gears, and tools.
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1 Forging surpasses casting in predictable strength properties-producing superior strength that is assured, part to part. 2  Forging refines defects from cast ingots or continuous cast bar. 3  A casting has neither grain flow nor directional strength and the process cannot prevent formation of certain metallurgical defects.
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Drop Forging. Closed die drop forging is a steel shaping process whereby a heated steel billet is placed on a lower die mould block, while an overhead, die-equipped ram hammer drives or “drops” down, forcing the metal to fill the contours of the two die blocks.
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Forging on a drop hammer is carried out in a succession of die impressions using repeated blows. The quality of the forging, and the economy and productivity of the hammer process depend upon the tooling and the skill of the operator.
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It is important that when manufacturing a metal forging by this process, the part is worked significantly enough to change the structure of the material in the center of the work piece. Large shafts for motors and turbines are forged this way from cast ingots.
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Another common open die forging process performed in industrial metal forging manufacture, involves using flat die to round an ingot. With the use of mechanical manipulators, a work piece is compressed and rotated in a series of steps eventually forming the metal into a cylindrical part.
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Edging is also an open die forging process often used in manufacturing practice, to prepare a work for sequential metal forging processes. In edging, open die with concave surfaces plastically deform the work material. Edging acts to cause metal to flow into an area from both sides.
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This forging process is ideal for longer shapes where only one end of a part needs to be forged. Upset forgings are made by gathering material to a designated area of a carbon, alloy, or stainless steel bar.
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Metal forging is a metal forming process that involves applying compressive forces to a work piece to deform it, and create a desired geometric change to the material.
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BusinessDictionary.com. Metal shaping process in which a hot piece of metal is hammered (forged) between the stationary part and the moving (dropping) part of a two-piece hollow metal die (called forging die) in one or several operations. Employed usually in manufacturing axles, crankshafts, gears, and tools.
http://www.businessdictionary.com/definition/drop-forging.html
what is drop forged
Metal shaping process in which a hot piece of metal is hammered between the stationary part and the moving  part of a two-piece hollow metal die which is also called forging die in  several operations is known to be drop forged. Drop forging is a metal shaping process in which a hot piece of metal is hammered between the stationary part and the moving part of a two-piece hollow metal die in one or several operations.