The Drop Forging Process also referred to as Closed Die Forging, is a process that manipulates a heated metal bar, pre-form shape, or billet within the wall cavity of two dies. This process is also referred to as impression die forging. The impression for the forging can be in either die or divided between a top and bottom die, as shown in our illustration. During this process, the material grain structure becomes compressed and aligned to the required component shape. This greatly improves strength and resilience.