In addition, due to the rational stream-line-distribution of metal fibres and uniformly distributed metallographic structure, roll-forging products exhibit better mechanical properties and reliability than those manufactured by die-forging or machining. It has remarkable advantages such as high productivity, high utilization rate of material, good labour condition, simple equipment structure, long life of the rolling dies and so on. Roll-forging can be used in both the preforming procedure and the finish forming procedure of forging process. In this process, the desired shape of metal part is produced by rolling the hot billet between two rotating dies having appropriately profiled grooves. Roll-forging is a process to manufacture axle-like and plate-like metal parts.
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