Upset forging or heading forging increases the diameter of the workpiece by compressing its length.
A heading tool or ram is positioned perpendicular to the cross sectioned end face of a rod or bar gripped in a die. On application of pressure, the length of the rod is reduced and the diameter is increased (upset). This manufacturing process is used extensively in the production of fasteners, to form bolt heads, screw heads, shaft heads, etc.
Upset forging and heading forging are suitable of kinds of carbon steels, alloy steels, stainless steels.