The MH series 4 roll plate bending machine has been refined over the years through extensive research and development and is considered one of the finest plate rolling machines available on the market worldwide. The 4 roll machine is the easiest, quickest, rolling machine to operate 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. There is no chance to lose the position of the plate due to being pinched at all times during the rolling cycle, which makes the 4 roll the only machine perfectly suited to be controlled by a NC or CNC control.
When rolling with a 4 roll machine one of the most important aspects is the ability to maintain a perfect parallel of the lower central pinching roll. The lower roll on the MH 4 roll 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. Other manufacturers are using a series of complex and expensive hydraulic circuits and multiple encoders to control oil flow to 2 separate cylinders pushing upwards to keep a theoretical parallel. The ability to hold the roll parallel is lost if anyone of these separate components fail. Side roll parallelism is also maintained by a torsion bar system which connects both ends of the roll together, again eliminating the need for extra encoders and hydraulic circuits with higher failure rates.
The 2 central driven rolls are rotated by hydraulic motors and high efficiency planetary gearboxes coupled directly to the rolls. This 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 updated geometry which eliminates the far less efficient rectilinear gib and way systems. This allows us to power the hydraulic pumps with a smaller more efficient electric motor which can represent a substantial yearly energy savings without sacrificing machine power or speed.
Typical bending steps on a 4 rolls machine.
Being an all-welded steel frame, the body of the machine is extremely sturdy which enables the rolls to accommodate bending forces safely. This also eliminates the need for special foundation requirements for most installations.
The forged steel rolls are of the highest quality, further more the rolls are heated and quenched to provide surface hardness of 55 to 60 HRC and then they are polished, thus extending the life of the rolls and improving the finish quality of the work piece. The taper or barrel profile of the rolls can be customized to suit specific applications.
Maximum torque is made available to the rolls via direct coupling to the hydraulic motor and planetary gearbox. With no secondary transmission efficiencies are improved and maintenance eliminated. The rolls are mounted on quality massive double crowned floating barrel bearings, these bearings are pre-greased and sealed and so require no service.
The components within the hydraulic and electrical system are of internationally recognized manufacture to ensure reliability and supply of parts for service through out the machines working life.
MG was established in 1959 in Fossano Italy with a major focus on industrial automation leading to the developement Plate Rolls in 1981. MG now stands as one of the Europe’s largest manufacturer of Plate Rolls and their continual development program ensures that customers who choose MG machines have the latest technology and best possible quality. The machine’s high-build quality, level of specification and competitive price ensure that the MG Plate Roll Machines are suitable for all sectors of the sheetmetal and fabrication industry.
STANDARD EQUIPMENT of Plate Rolling Machines - 4 Roll:
Four roll, double initial pinch design
Robust all steel construction
Pinching rolls driven via hydraulic motors and gear-box with direct coupling
All rolls mounted on double crowned floating sealed barrel bearings
Hardened rolls to 50 to 55 HRC with polished finish
Roll balance and parallelism via massive torsion bars
Operations via lever distributors on a swinging control panel
Infinite speed control over all movements
Lateral roll movements via planetary guides
Lateral roll position given by two electronic digital read outs
Hydraulic drop end (low profile)
Lateral rolls with indicator line for plate alignment
Cone rolling device
Safety wire around machine base with trip switch
Safety valves for lateral roll release
OPTIONAL EQUIPMENT of Plate Rolling Machines - 4 Roll:
Sectional steel rolling device
Additional digital read outs for roll positioning
Central vertical plate support with hydraulic drive
Single lateral plate support with hydraulic drive
Radius measuring device