forming-manufacturing-processes > Hot Upset Forging

In this process the diameter of a bar is increased by applying pressure along its length (axially) whilst a portion of the bar (typically the end) is hot enough to be formed.

The pressure causes the localised increase in diameter and reduction in length of the bar, the additional localised material can be utilised to form features. This is typically how bolt heads are formed when using this process.

Hot Upset Forging can be performed simultaneously with the action of forming the additional material if the axial pressure is provided by a die with the required internal geometry.