Advances in MG’s 4-roll plate rolling technology

The MG srl K model can be used as both a 4-roll and as a variant of the 3-roll variable geometry.

MG srl has made advances on its 4-roll plate bending machine.

Electronic Parallelism. A dedicated electronic control enhances precision and repeatability on each roll. Two proportional electro-valves, two digital readouts, and transducers grant the positioning of each roll. The oil flow is controlled and directed as well. Models ME are the machines with this kind of control.

Linear Guides System. On each rolled piece, no matter the length and thickness, there is a flat section of the plate that does not get bent. MG machines are engineered to reduce the flat end so that it is from 1.5 to two times the sheet thickness. With the linear guides system, it is even shorter. When the space between the side and central lower roll is shortened, less space is needed to pinch the material and a shorter flat part results. A rectilinear stroke of the side rolls brings even smaller diameters in the worked pieces. These linear guides are the ML models. These models are equipped with electronic parallelism as well.

Synthesis. Synthesis is an option on 4-roll machines with a 4-power drive: It means that each roll is driven by its own drive. The machine has more dragging force, which can be useful on high-tensile-strength materials that require additional bending passes.

Calibration System. The operator can put the central roll down, block it hydraulically, and perform the bending using the other three motorized rolls on the top and sides. This way the machine also can be used as it is a 3-roll type.

K Model. These 4-roll machines are able to perform nearly any type of rolling.

The lower central shifting roll allows fabricators to obtain a shorter prebend. It also provides additional options for conical rolling. The top roll moves on a vertical stroke, which helps when pressed rolling is required. It adds versatility to the standard features of a bending machine, such as being able to be used as both a 4-roll and as a variant of the 3-roll variable geometry.

The parallelism of the side rolls is controlled and stabilized by an electronic system. Two proportional electro-valves, two digital reading transducers, and a dedicated electronic control ensure roller precision and repeatable positioning over time, independent of temperature and mechanical wear. This ensures maximum precision.

The MG system, with the rolls assembled on sealed bearings and without secondary components, reduces the dissipation in the applied force generated with the frictions of the various components.

The side rolls move on a rectilinear axis, which reduces the space between the rollers themselves. The clamping point of the sheet between the side and the top occupies less space. This allows fabricators to use very small-diameter rolls and to have a shorter straight part.