Roll forging is a process where the thickness of a bar stock is reduced, and the length increased. The process of roll forging involves the use of two semi- cylindrical or cylindrical rolls that both contain one or more shaped grooves. A heated bar is inserted and progressively shaped as it is rolled through the machine. The bar is then either transferred to the next grooves or is inserted into the same grooves once more, until the desired size and shape are achieved.
This process imparts a favourable grain structure into the work piece and has no flash.
Products produced at roll forging units in India include leaf springs, axles, and tapered levers.