China Open-die Forging Factory

Open-die forging is a metalworking process where heated metal billets are shaped under repeated hammer blows or pressure without being fully confined within a die. Open-die forging process allows for greater flexibility in forging large or customized parts while improving the metal's mechanical properties.

Select the appropriate metal material according to the required mechanical properties of the part, cut it into billets of specified size or weight, and remove contaminants, rust or oxide layers from the billets.

The metal billet is uniformly heated to a specified temperature in a furnace to increase its deformation plasticity.

The heated metal billet is placed on a flat or slightly contoured die and deformed using controlled blows of a hammer or press. The shape of the part is forged through operations such as upsetting, stretching (elongation), bending, punching, twisting, and flattening (the workpiece is not constrained in the transverse direction and can be flexibly formed).

· Upsetting: used to shorten the length of the blank, increase the cross-sectional area, make it closer to the final shape, and improve the material organization.

· Drawing Out: Increase the length of the blank and reduce the cross-section, mainly used in the manufacture of shaft and rod parts.

· Punching: Increase the length of the blank and reduce the cross-section, mainly used in the manufacture of shaft and rod parts.

· Punching: Use a punch to apply pressure on the blank to form a hole, used to make annular or perforated parts.

· Reaming: Expand the workpiece after punching to obtain a larger inner diameter and uniform wall thickness.

· Bending: Bend the blank into the desired shape, suitable for the manufacture of hook-shaped, elbow and other parts.

· Twisting: Rotate the blank around the axis at a certain angle, suitable for parts that require a specific twisted shape.

The forged parts are gradually cooled to minimize internal stress and prevent cracking.

Some forged parts can be directly transferred to the heat treatment step to enhance performance.

Forgings are heat treated by normalizing, annealing, quenching, and tempering to improve the mechanical properties of forgings, release internal stress, and refine the grain structure.

Strictly inspect and correct the size, shape and performance of forgings to ensure that the products meet the design requirements.

Surface treatment and subsequent processing of forgings are carried out according to customer requirements.

Comprehensive measurement is carried out through surface quality inspection, dimension inspection, mechanical property test and other quality inspection methods to ensure that the forgings meet the requirements of the design drawings.