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درباره:
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Open die: Open dies are akin to the blacksmith’s hammer and anvil and are usually available in shapes that accomplish specific tasks such as squaring. They do not completely encase the metal, providing free flow everywhere except where the metal meets the die. Open die forging is a good choice for custom metalworking applications as it can be used to produce as few as a single forging. It is also useful in forging very large parts. Where a blacksmith might use tongs to grapple the hot metal forging, many larger forgings are handled by mechanical manipulators because of their immense weight. Open die forging depends a great deal on the skill of the forger to produce the desired shapes. In addition to producing stepped shafting, rings, and cylindrical hollows, open die forging is often used to produce the hemispherical ends of pressure vessels.
Closed die: Here, the metal is completely encased. When the CNC hydraulic die forging hammer or press pushes against the metal, the metal flows and fills the die cavity or cavities. Typically, the pre-forged part will have some resemblance to the final forging before it is placed in the die, preformed by a series of so-called blocker dies.
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