Below is a list of Drop Forging manufacturers from Warren, Michigan. Drop forging is a metal shaping process in which a hammer drops onto an ingot, or metal workpiece, in order to compress it and conform it into the shape of a die or set of dies. Drop forging is the most common metal forging method, and it can be employed in hot forging, warm forging, and cold forging, as well as in both open die forging and closed die forging. This is a modern form of smith forging; the manual force of the blacksmith wielding a hammer has been replaced by a mechanized hardened alloy steel hammer fitted with a specially shaped die.