BENEFITS OF 4-ROLL PLATE BENDING MACHINES
• Four roll plate rolls are more precise, productive, versatile, faster, safer and easier to operate than three roll machines. They are less dependent on operator competence. They are ideal for bending plates up to 90 mm thick.
• The fastest and most accurate bends are made by four roll machines. The plate is held securely in place between the top and bottom rolls while the side rolls move vertically to create the bend.
• The bottom roll moves up to hold the plate edge securely against the top roll while the side roll is raised to form an accurate pre-bend,minimizing the flat zone on the plate edge. Pre-bending on a three roll machine requires that plates be tilted down as they are being fed. In contrast, plates are loaded horizontally at the feed level for pre-bending on a four roll machine, which allows the ake place on either side of a four roll machine. If fed from only one side, they can even be placed up against a wall to save floor space.
• The side rolls are positioned to the right and left of the bottom roll and are on their own axes. The independent axis of each roll helps make a perfect bend. The “back” side roll (at the far side of the feeding point) also functions as a back gauge to square the plate for proper alignment. This eliminates the need for someone to assist the operator.
• The plate is kept square without slipping during both pre-bending and rolling because of the constant secure clamping of the top and bottom rolls.
• Four roll machines do not require the operator to remove, flip, and then try to square and reposition the plate a second time after first pre-bending,as is the case with three roll initial pinch machines. Keeping the material in the machine makes four rolls 50% more efficient than three roll initial pinch machines, and allows a cylinderical shapes to be rolled to the required diameter immediately following pre-bending.
• Bending the back edge takes place after the rolling process, for a one direction and single pass operation. This process provides less working area.
• Cone rolling is easier on a four roll machine. The side rolls can be tilted to establish the cone angle and the bottom roll can also be tilted opposite side to clamp and drive end of plate. (Standard feature on JMT rolls)
• Four roll machines are the only type of plate rolls that can effectively make use of NC and CNC controls. Because of the constant clamping and driving of the material during all steps of rolling. Bending complex shapes like polycentric or elliptic work pieces can be easily done with JMT four roll machines.