Hubbing

Hubbing is a metalworking process that is used to make dies. It is a cold-working process, which means that it occurs well below the melting temperature of the metal being worked.

Process

In hubbing, a male hub (master) is created with a profile that will form an impression on the female piece. The male hub is generally hardened and the female die block softened by annealing to help form the impression. As the metal flows the face of the die block is deformed, and, generally, must be machined flat. The die block is often a cylinder that is reinforced with a surrounding steel ring during the hubbing process. Hubbing is usually less expensive than die sinking, i.e., machining the female die, and multiple dies can be made from the male hub.

In the case of mild steel, a typical hubbing press exerts a pressure of approximately 1500 short tons-force per square inch (21 GPa) to transfer the image from a master hub into the master die.

References

DeGarmo, E. Paul, J T. Black, and Ronald A. Kohser. Materials and Processes in Manufacturing. Upper Saddle River, New Jersey: Prentice Hall, 1997. ISBN 0-02-328621-0

Metalworking

Forming, fabrication, and finishing

General	Fabrication Piece work Sheet metal

Forming processes	Coining Drawing Electrohydraulic forming Electromagnetic forming Explosive forming Forging Hydroforming Progressive stamping Punching Rolling Sinking Spinning Swaging Tube bending

Joining processes	Brazing Crimping Riveting Soldering Welding

Finishing processes	Anodizing Galvanizing Heat treating Mass finishing Patination Peening Plating Polishing

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Hubbing

Process

See also

References