4 Roll plate bendingOur new line of 4-roll plate bending machines offer many decisive advantages. MG four roll line is the easiest to operate plate bending machine, thanks to its ability to pinch the plate between the 2 central driven rolls, prebend the leading edge, and rolling the body of the part along with the trailing edge all in one direction and in one pass.
4 Roll plate bending Rolling Machine
- Company MGsrl
- Category Rolling- Machines
- Type Rolling Machine
The plate is kept square, without slipping, during both pre-bending and rolling because of the constant clamping of the bottom and top rolls. This makes our four roll machine perfectly suited to be controlled by a NC or CNC control. The MG solution is reliable and effective. Side roll parallelism is maintained by a torsion bar system which connects both ends of the roll together, eliminating the weakness of extra encoders and hydraulic circuits.Â
Our special advantage is the ability to maintain a perfect parallel of the lower central pinching roll. The lower roll on the MG 4 roll plate bending is raised and lowered by rotating an eccentric bar located beneath the lower roll. Since both ends of the roll are being lifted by this one piece eccentric bar it is impossible for the lower roll to be moved out of parallel. We do not use hydraulic circuits and multiple encoders to control oil flow to two separate cylinders, pushing upwards to keep a theoretical parallel, because the ability to hold the roll parallel is lost if any of these components fail.
Our 2 central rolls are driven by hydraulic motors and high efficiency planetary gearboxes, coupled directly to the rolls. This MG solution (along with the rolls being mounted in low friction sealed bearings) greatly reduces the torque lost by clutches and synchronization systems used on other machines.
The side rolls are raised and lowered on planetary swing guides with perfect geometry which eliminates the less efficient rectilinear gib and way systems. This allows MG to power the hydraulic pumps with a smaller electric motor: you get substantial energy savings without reducing the machine power or speed.
To roll a given diameter on our four-roll is extremely simple.Â You introduce plate into the roll touching it off to the opposing outboard roll for quick and accurate squaring of plate. You then raise lower central pinch roll and the plate is locked into position with no possibility of slipping.Â After this you back plate up to near tangent point of central rolls, then raise the left or right outboard roll to the correct position to achieve your diameter and begin rolling. When the back edge gets close, simply release the left outboard roll and bring up the right outboard roll until it touches the plate and finish the pipe in one pass.
MG is faster, easier to operate !
Because the plate is automatically squared and always pinched and not released until the pipe is complete, the net result is that our four-roll requires less positioning and much less experience on the operatorâ€™s part. Our plate bending machines can work for many years without maintenance, thanks to the well-known strength of our hydraulic and planetary systems. Special manual distributors and valves allow us to have infinite variable speeds on all movements.
Conical shapes ? Try MG !
For bending a cone properly you need our 4-roll M line.
The reason is this: the four-roll (lower central pinch roll) can be inclined in a negative attitude and is also capable of adjusting the force at which it pinches which allows the roll to grip the cone only on the large diameter which needs to turn faster and only with enough force to turn the part. This allows the small diameter to be slowed down more easily.Â To sum it up, rolling cones properly absolutely requires a lower central pinch roll (fourth roll) capable of a negative inclination and adjustable pinch pressure. MG four-roll machines have this capability.