What is the Difference between Roll Forging and Extrusion Forging?

Besides Press forging and Drop forging, Roll forging and Extrusion forging are other methods for shaping and forming metal into specific shapes and sizes. Although they both have significance in metal products forging, they have unique advantages and disadvantages.

What is Roll Forging?

Roll forging, also known as rotary forging, involves rolling a billet or pre-formed metal piece through a series of rollers to reduce its cross-section and form it into a specific shape. The rollers exert compressive forces on the metal, shaping it as it passes through. Roll forging is the best choice for automotive parts forging. It imparts high strength and a good surface finish to automotive parts like axles, shafts, and gears.

Advantages of Roll Forging

As said, Roll forging produces high-strength automotive parts with consistent properties throughout the product. Roll forging also provides a cost-effective alternative to machining and casting, as the process is relatively simple and requires minimal finishing. Additionally, Roll forging results in minimal waste, as it does not create a need for cutting the metal.

Extrusion Forging

Extrusion forging, on the other hand, involves forcing a billet of metal through a die to create a specific shape. Just like closed die forging, the metal undergoes compressive forces causing deformation of the piece. They are best suitable for products requiring long, straight, and consistent shapes. Thus, being quintessential for sewing machine parts forging.

Advantages of Extrusion Forging

Similar to Roll forging, Extrusion produces parts with minimal waste. They effortlessly create complex shapes and cross-sections. Extrusion forging enhances the production ability since the process is relatively fast and efficient. It additionally yields parts with an excellent surface finish.


There are some limitations to both roll forging and extrusion forging. Roll forging, for example, requires a specific type of metal that can withstand the compressive forces of the rollers. It is also limited to certain shapes producing capacity.

Extrusion forging is limited by the size of the die and the amount of compressive force that can be applied, which may result in cracking or other defects in the final product.

Concluding Thoughts

In conclusion, Roll forging and Extrusion forging have their own unique set of advantages and disadvantages, making each method ideal for different applications. The choice between the two will depend on the product’s specific requirements, including its shape, size, strength, and surface finish. Both methods can result in high-quality, cost-effective metal products.

Murari Engineering Works have been in the forging industry since 1959. We have top-notch machinery for automotive parts forging and sewing machine parts forging. Besides, we cater to the agriculture and scaffolding industries.