https://orbit.dtu.dk/files/5556704/2010_Keynote_FR21.pdf

Environmentally benign tribo-systems for metal forming

Interest in ultrafine-grained (UFG) materials has grown rapidly in past 20 years. This review focuses on the application of special rolling techniques for improvement of the mechanical properties of UFG metal sheets. These techniques include asymmetric rolling, cryorolling, asymmetric cryorolling, cross-accumulative roll bonding, and skin-pass rolling. The techniques also include a combination of processes such as equal channel angular press and subsequent rolling, combined high-pressure torsion and subsequent rolling, as well as combined accumulative roll bonding and subsequent asymmetric rolling. We also discuss the main mechanisms leading to improvement in the ductility of UFG materials related to the special rolling techniques.

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Special Rolling Techniques for Improvement of Mechanical Properties of Ultrafine-Grained Metal Sheets: a Review †

Influence of roll radius on roughness transfer in skin-pass rolling of steel strip

The influence of tool roughness in skin-pass or temper rolling of steel strip is investigated focusing on roughness transfer and strip elongation under pure normal loading, i.e. with no tangential shear between tool and workpiece. The process is simulated by an elasto-plastic FE simulation of plane strain indentation with plane tools provided with idealized surface roughness profiles under dry friction condition. Tool roughness is modelled as a series of circle segments with different average roughness R a and pitch size. The results are analysed statistically, showing significant influence of tool roughness on roughness transfer at various pressure levels.

Skin-pass rolling I—Studies on roughness transfer and elongation under pure normal loading

Mechanical properties and tensile fracture mechanism investigation of Al/Cu/Ti/Cu/Al laminated composites fabricated by rolling

Influence of roll radius on contact condition and material deformation in skin-pass rolling of steel strip

The influence of tool roughness on roughness transfer in skin-pass or temper rolling of steel strip is investigated, focusing on loading under combined normal and tangential displacement of tool relative to the workpiece. The calculated roughness transfer by an elasto-plastic finite element (FE) simulation of plane strain indentation in authors’ previous paper [H. Kijima, N. Bay, Skin-pass rolling I—studies on roughness transfer and elongation under pure normal loading, International Journal of Machine Tools and Manufacture, May 2008, accepted for publication] is verified by experimental measurements in this paper. The experiment shows a significant influence on roughness transfer of tangential displacement of workpiece in the sticking and the sliding region. The FE calculations modelling the sticking and sliding region reveal the mechanisms of plastic deformation and roughness transfer.

Hideo Kijima

Papers

Influence of roll radius on roughness transfer in skin-pass rolling of steel strip

Skin-pass rolling I—Studies on roughness transfer and elongation under pure normal loading

Influence of roll radius on contact condition and material deformation in skin-pass rolling of steel strip

Skin-pass rolling II—Studies of roughness transfer under combined normal and tangential loading

An experimental investigation on the influence of lubrication on roughness transfer in skin-pass rolling of steel strip