Roll forming is a continuous operation where sheets, strip, or coiled metal is bent or formed into shapes with an identical cross section throughout the length of the sheet. The process involves feeding the sheet between sucessive pairs of contoured tool steel rolls that shape it into the desired cross section. The sheet or coil may pass through one to ten set of rolls, or stands. This process adds both strength and rigidity to the metal sheet. The metal is only bent or formed during the roll forming operation. The thickness of the metal is not changed while passing through the rolls, except where tight radii occur, minimal thinning will occur. Care must be taken when designing the rolls to allow for a smooth transition from roll to roll, thus preventing blemishes on the finished surface of the sheet.
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