Flatness of rolled sheets depends on the roll deflection. Sheets become wavy as roll deflection occurs. If rolls are elastically deflected, the rolled sheets become thin along the edge, whereas at centre, the thickness is higher. Similarly, deflected rolls result in longer edges than the centre. Edges of the sheet elongate more than the centre. Tension leveling will eliminate edge wave & center buckle as well as correct excessive crossbow and coil set. Chicago Steel will tension level HRP&O, Cold Rolled, Cold Rolled Full Hard, Galvanize, Galvalume, Aluminized, Advanced High Strength Steels, Stainless Steel, Aluminum, Titanium and Painted Products.

Sheets are made whenever an aluminum block is passed between rolls under pressure. As it is rolled and re-rolled, it becomes stretched and longer in the direction it is moving. It is then considered a sheet once the rolling process stops at 0.249 to 0.006 inches. Stretch forming is a metal forming process in which a piece of sheet metal is stretched and bent simultaneously over a die in order to form large contoured parts. Stretch forming is performed on a stretch press, in which a piece of sheet metal is securely gripped along its edges by gripping jaws. Oct 04, 2010 · Prebending is performed on the plate roll at the leading and trailing edges of the sheet (see Figure 2)—and eventually the seam (see Figure 3). A sheet cannot physically be bent right to the edge, and thus what remains is referred to as the unbent flat (see Figure 4). The minimum flat you can expect is 1.5 times the material thickness and ...