Abstract
Aluminum sheets O and 1/2H in hardness and 0.5 to 2.0mm in thickness were roll formed using urethan elastmer rolls 80°, 90°and 95°in hardness. The forming ratio is greatly affected by mechanical properties of the sheets. The O-sheets have better forming ratio than the 1/2-sheets. The 1/2H-sheets 1.5 and 2.0mm in thickness are incapable of forming into cylinders, while the O-sheets are capable regardless of their thickness. The maximum forming ratio is achieved for the O and 1/2H-sheets 2.0mm in thickness and for the rolls having different hardness. Both the O and 1/2H sheets 0.5mm in thickness are formed at a forming radius particularly greater than the sheets having more thickness. As the forming radius of the sheet approaches to a radius of steel roll, the formed radius is definitely limited corresponding to the materials, sheet thickness and forming conditions.
