Cold forging is a manufacturing process where a bar stock is inserted into a die and squeezed with a second closed die. The deformation starts at room temperature and changes the shape and size of the initial part until it has assumed the shape of the die. At this final step, the part can reach a temperature of up to 250°C, since the friction strain rates are very high during deformation.
The process requires high-resistance dies and high-duty steel, usually reinforced by retaining rings. Even if these dies are quite expansive compared to hot forging dies, their life time is much higher, leading to a competitive cost per unit. However, this can only be achieved with a suited design and efficient forging process, thanks to excellent engineering skills.
Cold Forged Steel Grades
Not all steel grades can be cold forged. Carbon content must be below 0,5%, and the strain hardening exponent must be acceptable. Usually, the mechanical properties are enhanced by the strain hardening, and therefore parts don’t need post forging full heat treatment cycle, including austenitization, quenching and annealing. This leads to cost savings, especially significant in the high-volume production of small automotive components such as fasteners.
Cold Forging Benefits
This is a highly automated manufacturing process and parts can be made economically. Another benefit of cold forging is the lack of grain growth and therefore perfectly aligned to the shape of the part metal grains with an exceptionally strong and resistant surface.
After years of experience, technology research and investment Setforge owns best machinery and tooling for cold forging equipped with most precisely created dies. We are one of the market leaders in the manufacturing of cold extruded shafts with up to 25 kg weight and 800 mm length. Cold forging enables the manufacture of net shape or near net shape parts with a tolerance of tenths of millimeters in diameter, which makes the post forging machining especially cost efficient.
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