Closed-die forging is a process of forging hot metal into a specific shape by pressing two shaped metal plates against a workpiece with great force. The part will bend and deform into the shape of the faces on each plate, filling the available space. The dies will fully enclose the workpiece, forcing the metal to fill the entire available cavity, and release as a negative image of the plates.
It is called closed “die” forging because the plates used to shape a workpiece are together called a die. Specifically, it is closed-die precisely because it is completely closed around a workpiece. This is opposed to an open-die that does not completely enclose a workpiece and allows the material to expand outward into the space between the die plates.
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