forming-manufacturing-processes > Cold Upset Forging & Heading

In this process the diameter of a bar is increased by applying pressure along its length (axially), similar to hot upset forging, however deformation is achieved without the addition of heat.

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 such as bolt heads.

Cold upset forging and heading, as with hot upset forging and heading, can be a multi stage process, or a singular action.

Material can be "upset", then the pressure of another die can impart the required shape, or with more simple forms or high pressures, both can be achieved simultaneously.