reflucting and extruding cold forging

Cold forging uses two types of forming operations, either in combination or separately, to shape a piece of drawn metal wire (steel, aluminium, copper, brass, stainless steel, titanium, inconel, etc.) through plastic deformation.

Process Advantages

Spinning

Spinning is a method of reducing the diameter of the material. Under the pressure of the punch, the metal is forced to flow through a spinning die, resulting in a smaller diameter. This is known as free or direct spinning. The same technique can also be used by forcing the material, contained in a die, to flow along a punch. In this case, it is referred to as reverse spinning or drilling.

Roughing

In some cases, creating the ‘head’ of the part may require several attempts. To do this, the metal is progressively deformed by upsetting to obtain a blank that will facilitate the desired shape in the next stage.

Upsetting

Upsetting is a forming process that shapes metal through plastic deformation. When force is applied to the end of a metal cylinder, located between a punch and a die, it exceeds the elastic limit of the material, causing it to deform. As a result, the diameter of the cylinder increases while its length decreases. This method is widely used in the production of bolt and screw heads.

Benefits and advantages

Parts produced using the cold heading process have superior physical characteristics, particularly when compared to bar turning, which is its main competitor.

Increased
strength

The continuous grain structure, which follows the profile of the part, contributes to significantly increased fatigue strength.
The work hardening resulting from cold forging increases mechanical strength, elastic limit and hardness, while reducing necking and elongation.

High
precision

In addition, this method guarantees high dimensional accuracy, remarkable surface finish uniformity, excellent repeatability, material savings and optimal productivity.