Closed​die forging—also known as impression die forging—is a highly productive metal shaping process in which heated metal is worked inside the closed dies to manufacture parts of a definite shape and having good mechanical properties. By forging metal inside a pre-planned die cavity, closed die forging provides a means for producing parts near-net or net-shape with higher strength, better repeatability, and greater dimensional accuracy. As such, the process is a good fit for parts that must perform reliably and be safe.