The discussion focuses on the differences in application between three-roll and four-roll plate rolling machines. Four-roll machines, such as the double-pinch style, allow for prebending both ends of a plate without removal, enhancing efficiency for 6 mm plates. In contrast, three-roll machines require separate prebending processes for both ends, resulting in longer cycle times. The four-roll design streamlines operations by enabling continuous rolling in the same direction, thus improving productivity.
PREREQUISITESManufacturing engineers, machine operators, and production managers involved in metal fabrication and plate rolling processes.
Also see;The Fabricator said:The four-roll styles have an additional roller underneath the top roll, which constantly pinches the plate during rolling. Double-pinch rolls can prebend both plate ends without removal, as is required with single-pinch rolls.
Three-roll machines generally require prebending the leading end, running the sheet through the machine to prebend the trailing end, and then switching roll rotation direction to roll the cylinder body. Four-roll plate rolls have a slight advantage in cycle time because they permit prebending of the leading edge, rolling the cylinder body, and finishing off the trailing prebend, all while rolling in the same direction.