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Slide 37 of 69
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Hot Stamping
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A near-net shape forming process involving hot forging between shaped, closed dies. Products are typically up to 1 kg in weight but can be up to 30 kg. Die costs depend on whether it is a simple two-die shape or if the opportunity is taken to include provision for third dies to help produce a more complex shape. This can be a very cost-effective production method for relatively long runs of product. Typical materials are the hot stamping brasses but others are possible.
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Hot stampings are made by forming hot slugs between shaped dies that are designed and made to give components that need a minimum of finishing. The dies can give accurate and consistent reproduction of the component in batches of from 500 to 50,000 units at rapid production rates.
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Compared with castings, hot stampings are sound, have good properties and are free from internal entrapped dross or surface moulding sand. They are easy to jig for accurate finish machining of faces, holes and threads. It is easy to stamp leaded brasses that are free-machining and other brasses such as dezincification-resistant brasses.