A 4-roll plate bending machine is a commonly used forging and pressing equipment that can bend non-metallic plates into cones, spheres, cylinders, or other shapes. It is widely used in industries such as construction, boiler steam, chemical, non-metallic structural engineering, and machinery manufacturing.
The 4-roll plate bending machine is more accurate, efficient, universal, faster, safer and easier to operate than the 3-roll machine. It relies less on the operator's ability. It is ideal for bending plates up to 6 inches thick. The fastest and most accurate bending is made by the 4-roll plate bending machine. The plate is firmly held between the top and bottom rollers while the side rollers move vertically to form the bend.
The lower roll moves up to firmly secure the plate on the upper roll while the side rolls are lifted to form precise pre-bends, minimizing the flat area at the edge of the plate. The pre-bend on the 3-roll machine requires the plate to be tilted down during feeding. In contrast, the plate is horizontally loaded for pre-bending on the 4-roll plate bending machine, allowing the use of a horizontal power roller to assist in feeding the plate.
Feeding can be done on either side of the 4-roll plate bending machine. If fed from only one side, they can even be placed close to a wall to save floor space. The side rollers are located to the right and left of the lower roller and are mounted on their own axis. Each roll's independent axis contributes to perfect bending. The "back" side roll (at the far end of the feed point) can also be used as a back gauge to flatten the plate for proper alignment without the need for human assistance. With the continuous firm clamping of the top and bottom rolls, the plate remains flat during pre-bending and rolling without slipping.
The 4-roll plate bending machine eliminates the need for operators to remove, flip, and attempt to flatten and reposition plates after pre-bending, which is the same as with the 3-roll IP machine. Keeping the material in the machine increases the efficiency of the four-roll machine by 50%, allowing cylindrical shapes to be rolled to the desired diameter immediately after pre-bending. For one-way, one-pass operation, bend the edge after rolling.
Cone rolling is easier on the 4-roll plate bending machine. The side rolls can be tilted to establish the cone angle, and the bottom roll can also be tilted to clamp and drive the plate. The 4-roll plate bending machine can effectively utilize NC and CNC control because of the continuous clamping and driving of the material in all rolling steps. JMT CNC 4-roll plate bending machine can easily bend difficult shapes such as multi-center or elliptical workpieces.