Longitudinal rolling in helicoid rollers

A new method of sheet rolling in helicoid rollers is considered. In this approach, the roller barrel is formed by a helicoid with rounded projecting tips. The effectiveness of the rollers is demonstrated, and their geometric parameters are determined. Depending on the mutual orientation of the rollers’ helical barrel surfaces, rolling will produce linear hardened zones on the strip, at some angle to its longitudinal symmetry axis. Such nonuniform deformation increases the strength of the sheet, thanks to the formation of local hardened zones, without overall loss of strip plasticity.